thermal radiation (or incandescence) associated with the thermal movement of particles (atoms, molecules, ions) and, by definition, is only dependent on the temperature;
luminescence for all other causes other than those associated with a thermal state. The mechanisms for these are varied, noting in particular: triboluminescence of mechanical origin, chemiluminescence with a chemical origin, electroluminescence with electrical origin, cathodoluminescence produced by the impact of electrons on a target, bioluminescence of organic origin, radioluminescence observed after the absorption of α or β particles and photoluminescence after photon absorption... Depending on the time constant, we distinguish between fluorescence and phosphorescence: in the former case the emission follows immediately after the excitation (τ < 10 ns) and in the latter case, it is delayed and lasts longer.
KeywordsThermal Radiation Spectral Radiance Spectral Average Bidirectional Reflectance Distribution Function Average Spectral Emissivity
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