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About luminescence
Luminescence can be simply defined as any emission of visible electromagnetic radiation (light) not ascribable directly to incandescence. Incandescence emerges at high temperatures due to thermal radiation; in contrast, because luminescence is often independent of temperature, it is sometimes termed cold light. However, some kinds of luminescence are associated with or require elevated temperatures. Notably, luminescence is exhibited by primary light sources rather than by secondary light sources.
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