IUPAC defines fluorescence as: a process in which an excited molecule spontaneously emits radiation while preserving the spin multiplicity (simplified: absorb light → emit light shortly after).
A broader umbrella term is photostabilizers / light stabilizers. In polymer terminology, IUPAC defines a light stabilizer as an additive incorporated into a material to protect polymers from photodegradation. In industrial contexts, systems aimed at mitigating UV-driven aging are often ...
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