Luminescence is "cold light" that can be emitted at normal and lower temperatures. In luminescence, some energy source kicks an electron of an atom out of its lowest energy "ground" state into a higher energy "excited" state; then the electron returns the energy in the form of light so it can fall back to its "ground" state. With few exceptions, the excitation energy is always greater than the energy (wavelength, color) of the emitted light.
Related journals of Luminescence
Lasers, Optics & Photonics, Chinese Journal of Luminescence, Journal of Luminescence, Luminescence : the journal of biological and chemical luminescence, Journal of Bioluminescence and Cemiluminescence, Journal of Light and Visual Environment, Journal of Lightwave Technology, Journal of Light Metal Welding and Construction, Light and engineering