Luminescence

Thermal radiated luminous products can help in a lot of places, to have any technical importance, a luminescent material must be easily excited by the appropriate excitation and must have high quantum efficiency, the ratio of the number of quanta absorbed to the number emitted. Luminescence can be used in medical textiles with x-rays and can go to another extreme and can be used underwater for scuba-divers to with a torch they are easily spotted underwater if anything were to happen/for their own protection. Also used for more everyday basic things like bike riders etc.