Optical & Optoelectronic Materials Selection Guide：Positioning materials, key metrics, and validation paths along “Generation → Guiding → Control → Readout” (with product navigation and Tables 1–4)
Optical & Optoelectronic Materials Selection Guide：Positioning materials, key metrics, and validation paths along “Generation → Guiding → Control → Readout” (with product navigation and Tables 1–4)
Optical materials can look overwhelmingly diverse—dyes, nonlinear crystals, waveguide resins, photochromic materials, detectors, thin-film coatings, optical glass… Yet within a system, they are essentially doing the same job: first, generate usable light in the target band; then guide it to the intended location with minimal loss; next, control its phase/intensity/polarization/spectrum as needed; and finally, reliably read it out as a measurable signal.
Accordingly, this article uses “Generation → Guiding → Control → Readout” as the main framework to unify material classification, key metrics, and minimal validation pathways.
1. Core concepts
1. A photon is the quantum unit of light. The energy of a single photon is E. In different media, the frequency ν remains unchanged, while the wavelength λ changes with refractive index. Therefore, in engineering practice, materials are still selected primarily by the target spectral band.
2. Photonics can be understood as the complete science and engineering stack around photon generation, control/modulation, transmission, detection, and applications.
3. Optical materials are the physical/chemical carriers that realize the above functions. They may take the form of small molecules, polymers, crystals, thin films, composites, or device platforms.
4. Photonic devices/systems turn materials into usable modules (light sources, waveguides, modulators, detectors, filters/coatings, packaging, etc.), then form working systems through coupling and packaging.
2. Use three questions to set the direction
1. What is the target wavelength band, λ? (Determines whether “what you emit/guide/detect” is physically feasible.)
2. What is the material form factor? (Solution / thin film / crystal / powder / device platform; determines processing and evaluation methods.)
3. What cost does the system fear most? (Loss, noise, insufficient speed, thermal drift, lifetime, drive power/voltage, poor reversibility, etc.)
3. Four core tasks: what materials do in a system
Four tasks | System role | Typical modules/scenarios | What to prioritize in selection |
① Generation / Emission (Emission & Conversion) | Ensure the system has usable light in the target band | Emissive films, fluorescence/laser systems, (when needed) frequency conversion | Band matching, efficiency, stability |
② Transmission / Confinement (Guiding) | Make light travel along a prescribed route with minimal loss | Fibers, planar waveguides, integrated waveguides, packaged optical paths | Refractive-index design (confinement), propagation loss, thermal drift/process tolerance |
③ Modulation / Switching (Modulation & Switching) | Make light controllable: phase/intensity/polarization/path | Modulators, switches, tunable filters, smart windows/photochromic indicators | Controllable magnitude (efficiency), speed/bandwidth, cost (insertion loss/drive/lifetime) |
④ Detection / Readout (Detection & Readout) | Convert light into a measurable signal (electrical/image/reading) | Photodetection, imaging, sensing | Sensitivity (responsivity/quantum efficiency), noise/dark signal, speed/linear dynamic range |
4. Four tasks → key effects and metrics
Task | Key physical effects | Three common metric categories |
Generation / emission | Absorption–emission, energy transfer, radiative vs non-radiative competition | Spectral match (absorption/emission vs target band); quantum yield / emission intensity; photo/thermal/chemical stability |
Guiding / confinement | Refractive-index contrast and mode confinement; material absorption/scattering | n/k (refractive index / extinction coefficient); propagation loss (dB/cm, etc.); thermal drift dn/dT, surface roughness / process window |
Modulation / switching | Electro-optic effects (Pockels/Kerr), carrier effects, absorption changes; or reversible photochromism/phase change | Δn or Δα (how much can be tuned); speed/bandwidth; insertion loss / drive voltage / energy and cycle life |
Detection / readout | Photogenerated carriers → electrical signal (PN/avalanche/organic, etc.) | Responsivity (A/W) and quantum efficiency; dark current/noise; response speed and linear range |
Note: Responsivity is the ratio of a photodetector’s output photocurrent to incident optical power, and is one of the most commonly used sensitivity figures of merit.
5. Representative materials and applications
Note: The following A–H is a mechanism-oriented index, not a set of mutually exclusive categories. The same material may appear across multiple lines due to different effects (e.g., LiNbO₃ can serve both frequency conversion/nonlinear optics and electro-optic modulation).
Main track | Representative materials | What these materials “take responsibility for” in a system | Typical application scenarios |
A Luminescent dyes (Visible–NIR) | Rhodamine, coumarin, cyanine dyes (Cy5/Cy7), BODIPY, perylene/PDI, DPP, porphyrins/phthalocyanines | Provide tunable absorption/emission spectral lines (“give the system light/color/signal”) | Labels & probes, display & spectroscopic detection, laser dyes, energy-transfer systems |
B Inorganic emitters & phosphors | Rare-earth emission (Eu³⁺/Tb³⁺/Ce³⁺), YAG:Ce, quantum dots (CdSe, InP, etc.), upconversion NaYF₄:Yb/Er | Stable emission, narrow lines or tunable colors (“make the light more stable and durable”) | White-LED phosphors, display/backlight, long-lifetime labels, upconversion imaging |
C Nonlinear optics (NLO) & frequency conversion | LiNbO₃ (incl. PPLN), KTP, BBO, LBO, organic chromophores (e.g., DR1-type as a conceptual representative) | Change light frequency/phase (“shift frequency, change optical properties”) | SHG/DFG, OPO, ultrafast optics, nonlinear device platforms |
D Waveguide & refractive-index (RI) materials | PMMA, SU-8, PI, PDMS, fluoropolymers (e.g., CYTOP), high-n resins (aromatic/sulfur-containing/halogenated systems) | Enable confinement with low loss (“make light travel stably”) | Planar/integrated waveguides, optical packaging/coupling, microfluidic optics, flexible optical routing (CYTOP is often used as low-n cladding/matching material) |
E Electro-optic/tunable & chromic materials | Liquid crystals; EO crystals (LiNbO₃ Pockels effect); EO polymers; azobenzene, diarylethene, spiropyran; phase-change materials (GST) | Field-driven change in refractive index/absorption (“make light controllable”) | Modulators, tunable filters, smart windows/optical switches, anti-counterfeiting & reversible displays (EO modulation is typically based on the Pockels effect) |
F Detection/imaging (photoelectric conversion) | Si, Ge, InGaAs, perovskites (emerging representative), organic photodiodes (OPD as a concept) | Convert light into electrical signals (“enable readout”) | Photodetection, NIR detection, imaging sensors, low-cost large-area detection (illumination → PN junction current/voltage is the canonical route) |
G Substrates/windows/optical glass & crystals (“the foundation” of your system) | Fused silica (quartz glass), BK7 (common visible–NIR optical glass), sapphire, CaF₂/MgF₂ (common for UV/low-dispersion scenarios) | Provide transmission/imaging plus mechanical & thermal stability; much of a system’s “background fluorescence, thermal drift, absorption/scattering” can originate here | Lenses/prisms/windows/cuvettes/substrates (BK7 is common for visible–NIR transmissive optics; fused silica is common for UV–visible high-stability optics) |
H Optical thin films/coatings/filters (“save usable light from the system”) | AR (antireflection), HR (high reflection), beamsplitter/dichroic, bandpass/long-pass/short-pass, ND, neutral & polarization-dependent films | Manage interface reflection and stray light to improve throughput/contrast; can also serve as functional optical path elements | Any multi-surface system (AR coatings improve transmission, reduce reflection/ghosts/feedback; multilayer films implement bandpass/stopband spectral functions) |
6. Minimal evidence chain: priority validations for each track
1. Luminescent dyes (A/B): Measure absorption/emission spectra (coverage vs target band) → then check photostability/thermal stability (can it run long enough?).
2. Waveguide/RI (D): Check n/k first (confinement feasibility; intrinsic absorption) → then run small-sample propagation-loss or end-facet coupling comparisons.
3. Modulation/tuning (E): Confirm which effect you rely on (Pockels / absorption change / chromism / phase change) → then measure Δn/Δα plus speed/cycling stability.
4. Detection/readout (F): Confirm response to the target band (bandgap/spectral response) → then verify whether responsivity + dark current/noise is sufficient as a combination.
5. Substrates/windows (G): Confirm transmission window and background (absorption, stray light, possible autofluorescence) → then check thermal stability/stress birefringence/processability and cost.
6. Films/filters (H): Confirm working band + angle of incidence (AOI) + polarization conditions → then check durability/laser damage threshold/environmental stability (will your system drift?).
7. Terminology notes
1. n/k (refractive index / extinction coefficient): n governs refraction and guiding conditions; k represents one major source of absorption loss.
2. Propagation loss: how much attenuation occurs per unit length in a waveguide.
3. Insertion loss: the additional optical loss introduced after adding a device into the path.
4. Responsivity (A/W): detector output photocurrent / incident optical power.
5. Dark current / dark signal: output present even without light; a key source of noise and a determinant of sensitivity floor.
6. Pockels effect: an electric-field-induced refractive-index change that is proportional to the field strength; the basis of many high-speed EO modulators.
7. AR coating: thin films that reduce interface reflection to increase optical throughput and reduce ghosting/feedback caused by reflections.
8. Product Navigation Table | Optical & Optoelectronic Materials: Quickly Locate Tables 1–4 by Research Task
Research situation / experimental need | Suggested table to check first | Why start here | Representative products in the table |
Optical coatings / interference filters / high-reflectivity mirrors / antireflection films (focus on refractive index, absorption, scattering, film stability) | Table 1 | Inorganic optical materials & crystals/semiconductors | Coating performance and optical loss are often dominated first by inorganic oxides/fluorides. Starting from high-n layers, low-n layers, and substrate materials is the most reliable way to establish optical constants and a robust process window. | Ta₂O₅, HfO₂, TiO₂, Nb₂O₅; MgF₂ (low-n layer), CaF₂ (window/low dispersion) |
Infrared windows / IR spectroscopic transmission materials & components (IR transmission, absorption bands, impurity background) | Table 1 | The core of IR components is intrinsic transmission plus impurity/defect absorption. Lock in the window/substrate material first, then discuss coatings and packaging. | Ge, ZnSe, PbS (NIR/IR benchmark), CaF₂, MgF₂ |
Electro-optic / nonlinear / frequency conversion (EO modulation, SHG, parametric processes, waveguides) or crystal growth related work | Table 1 | Selection is highly dependent on EO/NLO crystals and their high-purity growth salts/precursor systems. Choose the correct crystal system and purity grade first. | LiNbO₃, LiTaO₃; KDP (potassium dihydrogen phosphate), ADP (ammonium dihydrogen phosphate) |
Integrated photonics / telecom optoelectronic device materials (epitaxy, detection, lasers, photoelectric conversion) | Table 1 | Device performance is often limited first by the III–V / II–VI substrate family and defect density. Start from the substrate/material system and purity, then add interlayers and packaging. | GaAs, InP, CdTe, CdSe (quantum dots / emission related) |
Transparent substrates / optical structural parts / light guides / microfluidic optical chips (transparency, machinability, durability) | Table 2 | Optical polymers/films & system auxiliaries | The key is formability plus optical transparency/durability. Select the “base substrate” first, then consider surface treatment and optical coupling. | PMMA, PC, PS |
Diffuse reflectors / diffusion layers / integrating-sphere reflectance references / scattering media (reflectance, scattering stability) | Table 2 (first) + Table 1 (as needed) | Diffuse reflection/diffusion is commonly benchmarked first using polymer scattering systems to set a reflectance/scattering baseline; if structural color/colloidal scattering is needed, supplement with inorganic particle systems. | PTFE micropowder (reflectance/diffusion benchmark); mesoporous SiO₂ (colloids/scattering/structural color) |
Functional thin films / chemically resistant films / piezoelectric or sensing-related films (film formation, stability, functional coupling) | Table 2 | Film formation and long-term stability are often governed by the polymer matrix. Start with the film matrix, then consider fillers/electrodes/interlayers. | PVDF (functional film / benchmark); if needed pair with PEDOT:PSS (interlayer/electrode) |
OLED / organic emissive films & devices (vacuum deposition/doping, energy transfer, lifetime) | Table 3 | Organic/molecular optoelectronics & optical-control materials (OLED/OPV/liquid crystals) | OLED success hinges on emitter/transport/interfacial matching. Build a system starting from classic benchmark materials, then fine-tune purity and dopant ratios. | Ir(ppy)₃ (Ir complex), Alq₃, copper phthalocyanine, perylene; (interlayers can also be found in Table 2: PEDOT:PSS) |
Organic photovoltaics / organic photodetection (OPV) or donor–acceptor model systems (absorption, charge separation, morphology) | Table 3 (first) + Table 2 (as needed) | First lock in benchmark donor/acceptor pairs to establish reproducible spectra and device baselines; then add interlayers/encapsulation materials. | P3HT (donor), PCBM (acceptor), PTCDA (model semiconductor/interface); PEDOT:PSS (Table 2, interlayer) |
Liquid-crystal alignment, EO response tests, display/modulation principle verification (birefringence, dielectric anisotropy, alignment layers) | Table 3 | Start with “benchmark LCs / model molecules” to establish EO response and alignment processing, then expand to formulated mixtures. | 5CB; N-(4-methoxybenzylidene)-4-butylaniline (alignment/phase-behavior model) |
Fluorescence microscopy / spectroscopic setup and calibration (excitation–emission match, calibration, background control) | Table 4 | Fluorophores/probes/photoresponsive molecules & photoinitiators | Use classic dyes first to establish spectral channels, filters, and instrument response baselines before moving to more complex material systems. | Fluorescein, Rhodamine 6G, Rhodamine B, Coumarin 6, FITC, Nile Red |
Near-infrared (NIR) absorption/emission validation; detector response; photothermal/photoacoustic benchmarking | Table 4 (first) + Table 1 (as needed) | For NIR tasks, use “standard NIR dyes” to quickly verify the optical path and detector response; if IR windows/substrates are involved, return to Table 1. | ICG (Table 4); Ge/ZnSe (Table 1, window/substrate) |
Photoresponsive / photoswitch / photochromic materials (reversibility, fatigue, spectral change) | Table 4 | These tasks most need well-defined photochemical model compounds as mechanistic and stability references. | Azobenzene solutions, Disperse Red 1 |
UV-curable optical adhesives, transparent coatings, microstructure replication/packaging (cure depth, yellowing, shrinkage) | Table 4 (first) + Table 2 (as needed) | Start from photoinitiator type and cure depth when building UV-cure systems; if you also need resin backbones/packaging adhesives, supplement with Table 2. | 1173/184 type (e.g., 2-hydroxy-2-methylpropiophenone, 1-hydroxycyclohexyl phenyl ketone), BAPO, TPO; BADGE (Table 2, epoxy matrix) |
Optical path build-out / sample coupling, refractive-index matching, temporary encapsulation and vibration damping (“get the system running first”) | Table 2 | Common bottlenecks in optical experiments are coupling and environment. Use general-purpose materials to quickly reduce interface reflections and mechanical noise. | Silicone oil (coupling/matching), activated alumina balls (humidity control) |
Table 1 | Inorganic Optical Materials & Crystals/Semiconductors
(windows, thin films, nano-/polycrystalline materials, and growth salts)
Category | CAS No. | Aladdin Cat. No. | Name | Specification / Purity | Application scenarios & uses (optics/optoelectronics) |
High-purity growth salts for nonlinear optical crystals / high-purity associated salts | 7778-77-0 | Potassium dihydrogen phosphate | Anhydrous grade, ultra-pure grade, ≥99.995% metals basis | One of the key raw salts for KDP-type systems, commonly used in KDP-class crystal growth and optical-grade feedstock (low metal impurities helps reduce absorption and scattering defects). Also useful as a high-purity buffer/ionic environment component for spectroscopic benchmarking. | |
High-purity growth salts for nonlinear optical crystals / high-purity associated salts | 7722-76-1 | Ammonium dihydrogen phosphate (ADP) | Anhydrous grade, ACS, ≥98% | A representative salt for ADP-related growth systems, commonly used in crystal growth and as part of optical material precursor systems. Also usable for preparing buffers/ionic-strength environments as stability controls in optical measurement setups. | |
High-index inorganic oxides for optical thin films | 13463-67-7 | T431947 | Titanium(IV) oxide | Premium grade, ≥99% | A representative high-refractive-index oxide: used for high-index films (reflective/interference filter layers), scattering/whitening fillers, optical reflection and light-blocking layers; also often used as a photocatalysis benchmark if photostability/surface-reaction behavior under illumination is being evaluated. |
High-index oxide for optical thin films (coating/interference layers) | 1314-61-0 | Tantalum(V) oxide | PureSpectra™, spectral grade | Ta₂O₅ is a classic high-index, low-absorption thin-film material for AR/HR coatings, interference filters, waveguide layers, etc. Spectral grade is better suited for coating studies sensitive to scattering/absorption losses. | |
High-index inorganic oxides for optical thin films | 12055-23-1 | Hafnium(IV) oxide | Pellet, diameter × thickness 13 mm × 5 mm | HfO₂ is widely used as a high-index, low-absorption coating material (high-index layers for reflective/HR mirrors, laser-durable films, etc.). This form factor is convenient as an evaporation/sputtering feedstock or for process benchmarking. | |
High-index inorganic oxides for optical thin films | 1313-96-8 | Niobium oxide (monoclinic phase) | Electronic grade, ≥99.98% metals basis | Nb₂O₅ (monoclinic/related phase) is widely used for high-index optical films (interference filters/waveguide layers), electrochromic films, and dielectric functional films. Electronic-grade low metal impurities are better suited for low-loss optics and device-interface studies. | |
Transparent conductive / functional oxides (TCO, electro-optical coupling) | 18282-10-5 | Tin(IV) oxide | Basic grade reagent, for preparation | SnO₂ is a common transparent conductive/functional oxide system: used for TCO-related thin films (transparent electrodes), electron-transport/interfacial layers in optoelectronic devices, and preparation/benchmarking of materials coupling optical and electrical behavior (e.g., gas sensing). | |
Nano/porous photonic materials (hosts/structural color) | 7631-86-9 | Silicon dioxide | Nanoparticles, mesoporous; outer diameter 450–550 nm; pore size 2–4 nm | Large mesoporous SiO₂ particles are often used in colloidal assembly (structural color/photonic crystals), scattering media, refractive-index engineering, and porous hosts (loading dyes/emitters). The pore size is suitable for molecular adsorption and spectroscopy-responsive materials. | |
Semiconductor nanomaterials (nanophotonics/light scattering) | 7440-21-3 | Silicon | Nanopowder <100 nm (BET); <3% oxygen passivation | Si nanomaterials are used in nanophotonics (Mie resonances/scattering), silicon nanocrystal photoluminescence, photothermal effects, and photodetection. Oxygen passivation helps improve storage stability and reduce optical drift caused by surface reactions. | |
Semiconductor substrates & infrared optical materials (Ge) | 7440-56-4 | G434829 | Germanium | PrimorTrace™, ≥99.999% metals basis; sheet, thickness 2.0 mm, size 10 × 24 mm | Ge is an important IR material and semiconductor substrate: used for IR transmission/reflective component studies, opto-electrical characterization for IR detector materials, device substrates, and packaging window benchmarks. Ultra-high purity reduces free-carrier/impurity absorption. |
III–V semiconductors (optoelectronics/laser/detector substrates) | 1303-00-0 | G119227 | Gallium arsenide | PrimorTrace™, ≥99.999% metals basis, pieces | GaAs is a classic III–V: used for laser/detector/high-speed optoelectronic materials research and as an epitaxy/device-process benchmark. High purity helps reduce defect-related absorption and non-radiative recombination. |
III–V semiconductors (photonics/high-speed optoelectronics) | 22398-80-7 | Indium phosphide | PrimorTrace™, ≥99.99% metals basis | InP is a core substrate for long-wavelength telecom and high-speed optoelectronics: used for optical-communications devices and epitaxy benchmarking, photodetection, and integrated-photonics substrate comparisons. High purity reduces defects and optical absorption loss. | |
Inorganic semiconductors / quantum dots & emissive materials | 1306-24-7 | Cadmium selenide | Lumps, max lump size 15 mm, weight 50 g | A typical II–VI semiconductor: used for CdSe nanocrystal/quantum-dot synthesis and photoluminescence studies (tunable emission), plus exploration in photodetection and emissive devices. Lump form is convenient as a synthesis/evaporation feedstock. | |
II–VI semiconductors (IR detection/photoelectric conversion) | 1306-25-8 | C114079 | Cadmium telluride | PrimorTrace™, ≥99.999% metals basis | CdTe is commonly used in X/γ detection, PV/photodetection, and IR-related optoelectronic benchmarking. Ultra-high purity helps reduce trap states and dark-current-related issues. |
Inorganic semiconductors / window & emissive host materials | 1314-98-3 | Zinc sulfide | Sublimed grade, granular, 1–4 mm | ZnS is a common II–VI material for visible/IR optical materials research and as a matrix/benchmark in luminescent/phosphorescent systems. Sublimed grade better suits experiments sensitive to purity and optical loss (e.g., evaporation, emission benchmarks). | |
Inorganic semiconductors / infrared optical materials | 1315-09-9 | Zinc selenide | Powder, max particle size 45 μm, weight 20 g | ZnSe is an important IR optical material: used for IR window/optical component research and as a benchmark for IR transmission/absorption behavior. Powder form is also used for ceramic/film preparation exploration or material screening. | |
Inorganic semiconductors / infrared detector materials | 1314-87-0 | Lead sulfide | Galena (natural), 0.06–0.19 inch | PbS is a narrow-bandgap material system and can be used as a reference for NIR absorption and photoconductive response. Natural mineral samples are better suited as spectroscopy/structure characterization references. | |
Optical window crystals / low-dispersion materials (fluorides) | 7789-75-5 | Calcium fluoride | PrimorTrace™, ≥99.99% metals basis | CaF₂ is a classic optical window material: used for UV–visible–NIR windows/lenses, low-dispersion optics, spectroscopic system calibration, and transmittance benchmarking. High purity helps reduce impurity absorption and fluorescence background. | |
Optical windows / AR-coating materials (fluorides) | 7783-40-6 | Magnesium fluoride | PrimorTrace™, ≥99.99% metals basis | MgF₂ is a classic AR-coating/low-index layer material and can also serve as a UV-window benchmark. High purity supports low-absorption, low-scattering films and stable optical constants. | |
Electro-optic / nonlinear crystals (EO/NLO/waveguides) | 12031-63-9 | Lithium niobate | PrimorTrace™, ≥99.99% metals basis | LiNbO₃ is a “flagship” EO and nonlinear optical crystal: used for EO modulation, SHG/parametric processes, integrated waveguides, and acousto-optic devices. High purity helps reduce optical loss and drift. | |
Electro-optic / nonlinear crystals (EO/NLO/waveguides) | 12031-66-2 | Lithium tantalate | ≥99.998% metals basis | LiTaO₃ is widely used for acousto-optic/EO devices, nonlinear frequency conversion, and waveguide studies. Ultra-high purity helps reduce absorption and defect-driven optical loss. |
Table 2 | Optical Polymers/Films & System Auxiliaries
(transparent substrates, functional films, conductive polymers, encapsulation & coupling)
Category | CAS No. | Aladdin Cat. No. | Name | Specification / Purity | Application scenarios & uses (optics/optoelectronics) |
Optical liquids & refractive-index matching/coupling | 63148-62-9 | Silicone oil | Viscosity 5 cSt (25 °C) | A low-viscosity transparent medium commonly used for refractive-index matching/optical coupling (temporary immersion/contact coupling), vibration damping, and wetting/isolation of optical components and samples; also frequently used in optical-path setup and microfluidic-optics experiments. | |
Optical environment & system auxiliaries (drying/purification) | 1344-28-1 | Activated alumina balls | Used as adsorbent, general type | A common drying/dehydration and purification material used for humidity control in gloveboxes, gas lines, and sample/device packaging environments—reducing water-vapor impacts on optical films, fluorescent materials, and hydrolysis-sensitive precursors/crystals. | |
Optical polymer substrates (transparent / processable) | 9011-14-7 | Poly(methyl methacrylate) (PMMA) | General-purpose injection-molding grade | A representative transparent optical plastic used for lenses/light guides/windows, microfluidic chips, waveguides, and coating substrates. Injection-molding grade is suitable for dimensionally stable structural parts and optical-path packaging components. | |
Optical polymer substrates / model material | 9003-53-6 | Polystyrene (PS) | General type III; high strength; extrusion grade; food grade | Good transparency and processability; commonly used as an optically transparent substrate, in film/device packaging, and as a spectroscopic reference material. Also common in colloid/microsphere systems (polymer benchmark systems for structural color/photonic-crystal research). | |
Optical polymer films / piezoelectric & functional film material | 24937-79-9 | Poly(vinylidene fluoride) (PVDF) | Melt viscosity (K Poise): 23.5–29.5, powder | A polymer combining film-formability with functionality: used as a matrix for functional/composite films, piezoelectric/sensing film benchmarks, device encapsulation, and chemically resistant films. Powder form is convenient for solution-processed films or composite modification. | |
Diffuse reflection/diffusion & low-index materials | 9002-84-0 | PTFE micropowder resin | Average particle size: ~610 μm; apparent density: ~490 g/L | PTFE’s low refractive index and strong scattering make it widely used for diffuse reflectors/diffusion layers, integrating-sphere linings/reflectance benchmarks, and scattering/reflectance evaluation. Micropowder is convenient for pressing or coating to form high-reflectance or diffusive structures. | |
Optical polymer substrates (UV-resistant / structural parts) | 25037-45-0 | Polycarbonate (PC) | UV-resistant grade; melt index: 5 g/10 min (300 °C/1.2 kg) | Transparent, impact-resistant, and readily modified: used for optical protective covers, lenses/diffusers, and optomechanical structural parts. UV-resistant grades are better suited for long-term stability benchmarks and housings in illuminated environments. | |
Conductive polymers / transparent electrodes & interlayers | 155090-83-8 | Poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) | PEDOT:PSS = 1:6, 1.5% in water | A widely used transparent conductive, hole-injection/interlayer material for OLED/OPV/perovskite interfaces and flexible transparent electrodes/antistatic coatings. The aqueous dispersion supports spin-coating/doctor-blading film formation and process-window exploration. | |
Optical adhesives / encapsulation & UV-curable resin precursor | 1675-54-3 | Bisphenol A diglycidyl ether (BADGE) | Moligand™, ≥85% | A typical epoxy monomer used in optical encapsulants, transparent structural adhesives, and potting/bonding for optical components and sensors. Also commonly used as a base resin backbone for UV/thermal curing systems (paired with initiators/curing agents). |
Table 3 | Organic/Molecular Optoelectronic & Optical-Modulation Materials
(OLED / OPV / organic semiconductors / porphyrins / liquid crystals)
Category | CAS No. | Aladdin Cat. No. | Name | Specification / Purity | Application scenarios & uses (optics/optoelectronics) |
Organic optoelectronic material (absorption/charge transport) | 147-14-8 | Copper(II) phthalocyanine | Sublimed grade, ≥99.95% metals basis, triple-sublimed | A typical strongly absorbing organic dye/organic semiconductor: widely used as a thin-film absorption layer, in photodetection/organic photovoltaics, and as a benchmark for charge-transport/interfacial layers in OLED studies. Triple-sublimed high purity is better suited for vacuum deposition and device-grade thin-film research. | |
Organic emitter/organic semiconductor (PAH emitter) | 198-55-0 | Perylene | Sublimed grade, ≥99.5% | A representative polycyclic aromatic emitter and organic semiconductor used as a model system for emissive layers, spectral/fluorescence benchmarking, and studies of crystallization/aggregation-state emission behavior. Sublimed grade is better suited for thin-film optics and device-relevant comparisons. | |
OLED phosphorescent emitter / optoelectronic device material | 94928-86-6 | Tris[2-phenylpyridinato-C2,N]iridium(III) | Sublimed grade | A classic green phosphorescent emitter (Ir(ppy)₃-type), used for OLED emissive layers and doped systems, energy transfer, and exciton dynamics studies. Sublimed grade is compatible with vacuum deposition and high-purity thin-film optical characterization. | |
OLED small molecule (emission/electron transport) | 2085-33-8 | Aluminum 8-hydroxyquinolinate | ≥99.995% metals basis | A classic OLED material (Alq₃): commonly used as a benchmark electron-transport layer and/or emissive-layer material for thin-film photoluminescence, device lifetime, and energy-level matching studies. High purity helps reduce quenching and trap-related effects. | |
Conjugated polymer semiconductor (OPV/detection/transport) | 104934-50-1 | Poly(3-hexylthiophene-2,5-diyl) (regioregular) | Average Mw 25,000–50,000 | P3HT is one of the flagship organic semiconductor materials: used in organic photovoltaics (OPV), photodetection, thin-film transistors, and charge-transport studies. Regioregularity promotes ordered packing, making it a strong model system for morphology–performance correlations. | |
OPV acceptor / electron acceptor (fullerene) | 160848-22-6 | [6,6]-Phenyl C61 butyric acid methyl ester | ≥99.5% | PCBM is a classic OPV acceptor: used for photoinduced charge separation, electron transport, and thin-film morphology–performance correlation studies; often paired with P3HT and related donors as a standard model system. | |
Organic semiconductor / organic pigment (strong absorption, thin-film model) | 128-69-8 | Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) | ≥98% | A classic organic semiconductor/pigment used for organic thin-film optical absorption, interfacial and transport modeling in optoelectronic devices, and vacuum-deposited thin-film benchmarking. Often used to study how molecular packing correlates with spectral and electrical behavior. | |
Porphyrin / photosensitizing dye (spectroscopy & sensitization) | 917-23-7 | meso-Tetraphenylporphyrin | ≥99%, chlorin free | A free-base porphyrin scaffold with strong absorption, used in photosensitization, energy transfer, self-assembly, and thin-film optical studies. “Chlorin free” helps avoid extra impurity-derived absorption bands and photochemical interference. | |
Porphyrin / photosensitizing dye (optical absorption / PDT / spectral benchmarking) | 14074-80-7 | 5,10,15,20-Tetraphenyl-21H,23H-porphine zinc | Low chlorine | A representative Zn-porphyrin with strong absorption (Soret/Q bands), used for photosensitization/photoinduced electron transfer, spectroscopy benchmarks, and model systems for optical nonlinearity/energy transfer. Low chlorine helps reduce impurity-related absorption background and quenching. | |
Liquid crystal material (nematic benchmark) | 40817-08-1 | 4-Cyano-4′-pentylbiphenyl (5CB) | ≥98% | A benchmark nematic liquid crystal: used to validate LCD/modulation principles, test alignment layers and electro-optic responses, and benchmark dielectric/birefringence parameters; also a common reference in LC formulation research. | |
Liquid crystal / photoresponsive organic molecule (alignment/dielectric benchmark) | 26227-73-6 | N-(4-Methoxybenzylidene)-4-butylaniline | ≥97% | A typical aromatic Schiff-base structure used as a model compound or formulation reference in LC/alignment and dielectric anisotropy studies; also useful for studying how molecular anisotropy affects optical birefringence and phase behavior. |
Table 4 | Fluorophores/Probes/Photoresponsive Molecules & Photocuring Initiators
(spectral calibration, imaging, optical switching, UV curing)
Category | CAS No. | Aladdin Cat. No. | Name | Specification / Purity | Application scenarios & uses (optics/optoelectronics) |
Fluorophores & spectral calibration | 2321-07-5 | Fluorescein | Indicator | A classic high-brightness fluorophore (green region), widely used for fluorescence/absorption spectrometer calibration, fluorescence imaging and tracing, and optical sensing validation. Also serves as a “benchmark emitter” for system comparisons (solvent, pH, quenching/enhancement). | |
Fluorophores & laser dyes | 989-38-8 | Rhodamine 6G | Biological stain | A high–quantum yield dye and a classic benchmark for fluorescence intensity and wavelength response. Commonly used for fluorescence calibration and photoluminescence system validation; also a representative gain medium in dye-laser studies. | |
Fluorophores & spectral calibration | 81-88-9 | Rhodamine B | High purity, ≥95% (HPLC) | A commonly used red-region fluorophore for fluorescence intensity/wavelength calibration, photoluminescence benchmarking, and absorption–emission/energy-transfer experiments. HPLC-grade purity helps reduce impurity-driven background absorption and quenching. | |
Near-infrared dye (NIR imaging/absorption benchmark) | 3599-32-4 | Indocyanine green (ICG) | Moligand™, ≥75% | A representative NIR absorption/emission dye used for NIR absorption and fluorescence experiments, photothermal/photoacoustic benchmarks, and verification of spectroscopic systems and detector responses (for research/characterization use). | |
Fluorescent labeling dye (FITC/green channel) | 3326-32-7 | 5-Fluorescein isothiocyanate (isomer I) 5−FITC(isomerI)5-FITC (isomer I)5−FITC(isomerI) | Ex: 498 nm, Em: 517 nm, ≥95% (HPLC) | A classic green fluorescent label used for fluorescence calibration and labeling chemistry (–NCS reacts with amines), and as a benchmark in fluorescence microscopy/flow cytometry/spectroscopy. The listed Ex/Em facilitates filter set and optical-path matching. | |
Fluorescent probe (hydrophobic microenvironment/red channel) | 7385-67-3 | Nile Red | BioReagent, suitable for fluorescence analysis, ≥95% (HPLC) | A hydrophobic-environment-sensitive dye used to probe membranes/polymer microenvironments and lipid droplets/hydrophobic domains. In materials research, it is often used as a fluorescent indicator/benchmark for microphase separation and pore/carrier hydrophobicity. | |
Fluorophore / laser dye (strong green fluorescence) | 38215-36-0 | Coumarin 6 | ≥98% (HPLC) | A high-brightness green fluorophore used for fluorescence calibration, dye-laser/gain-medium studies, and OLED/polymer-film fluorescent doping benchmarks. HPLC grade helps reduce impurity quenching. | |
BODIPY fluorophore (high brightness, narrowband emission) | 154793-49-4 | 4,4-Difluoro-1,3-dimethyl-4-bora-3a,4a-diaza-s-indacene | ≥97% | A core BODIPY dye known for high fluorescence quantum yield, narrowband emission, and photostability; widely used in fluorescent probes, FRET model systems, and emission benchmarking in films/nanocarriers. | |
Photoresponsive molecule / photochemical model & reference standard | 103-33-3 | Azobenzene solution | Analytical standard, 2000 μg/mL in methanol | A classic cis–trans photoisomerization model molecule used for UV–Vis calibration, mechanism verification for optical switches/photochromism, and benchmark experiments in photoresponsive materials (polymer/film doping). A standard solution supports quantitative and consistent comparisons. | |
Photoresponsive molecule / absorption-dye reference standard | 2872-52-8 | Disperse Red 1 | Analytical standard | A common strongly absorbing azo dye used for quantitative absorption/transmittance measurements, benchmarking of photoresponsive doped systems, and model systems for photoalignment/nonlinear-optical dye doping. As a standard, it enables accurate calibration of spectral intensity and formulation concentration. | |
Photoinitiator (UV curing / photolithography) | 24650-42-8 | 2,2-Dimethoxy-2-phenylacetophenone | ≥99% | A widely used Type I photoinitiator for UV-curable adhesives, optical encapsulation, transparent coatings, and microstructure replication; suitable for benchmarking cure rate/transmittance windows and yellowing risk. | |
Photoinitiator (often used for mild / water-compatible systems) | 106797-53-9 | 2-Hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone | ≥98% (HPLC) | Commonly used in UV curing and photocrosslinking systems (more formulation/solvent friendly), suitable for photocuring research and benchmarking in transparent hydrogels/coatings and related systems. | |
Photoinitiator (common for UV curing / coatings) | 947-19-3 | 1-Hydroxycyclohexyl phenyl ketone | ≥98% | A widely used Type I photoinitiator for UV-curable coatings, optical adhesives, inks, and microstructure curing; suitable for evaluating cure depth, surface-dry vs through-cure, shrinkage, and impacts on optical transmittance. | |
Photoinitiator (general-purpose UV curing) | 7473-98-5 | 2-Hydroxy-2-methylpropiophenone | ≥97% | A common Type I photoinitiator for UV-curable resins and optical adhesives/coatings; suitable for rapid screening of cure rate versus light intensity/thickness, yellowing, and residual-monomer effects. | |
Photoinitiator (deep curing / LED-compatible) | 75980-60-8 | Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide | ≥97% | A high-efficiency phosphine-oxide photoinitiator often used for thick films/deep curing, LED-source curing, and low-yellowing optical adhesives/coatings; suitable as a benchmark for deep-cure capability and transmittance-window evaluation. | |
Photoinitiator (deep curing / high reactivity) | 162881-26-7 | Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (BAPO) | ≥97% | A multifunctional, highly efficient initiator used for deep curing in thick films and highly light-blocking systems, rapid-curing optical encapsulation, and 3D photocuring formulations; often used to increase cure speed and reduce risks associated with residual initiator via formulation optimization. |
Note: The above are representative Aladdin products. For additional specifications, please refer to the product list at the end of the article, or search the Aladdin website using “product name / CAS / catalog number.”
Aladdin: https://www.aladdinsci.com/