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Lue lisääLuminescent emitters
All light radiation that is not based on the temperature of a solid body is called Luminescence Radiation. Luminescence radiation is produced when electrons move from one energy level to another. The necessary energy can be applied to the luminescence radiator in the form of various excitation energies.
Radiation
| Designation | Excitation energy | |
| Electro luminescenence | Electrical power | Gas discharge, pn - transition |
| Photo luminescenence | Electro-magnetic radiation | UV-conversion with luminescent materials |
| Chemo- and bio luminescenence |
Energy caused by chemical reactions | Burning, oxidation, enzymatic reactions |
| Tribo luminescenence | Mechanical power | E.g., excitation of luminous effects in crystals through mechanical energy |
| Thermo luminescenence | Thermal power | E.g., excitation of luminous effects in crystals through heat |
| Radio luminescenence | Radioactivity | Aurora Borealis (polar aurora) |
High-pressure discharge lamps and low-pressure sodium lamps are therefore luminescence radiators in which the excitation energy is supplied in the form of an electrical current. In contrast, the luminescence of low-pressure mercury lamps comes from radiation energy (UV radiation).
Technical innovations in the luminescence of semiconductor materials (LEDs) and plastics (organic LEDs) are already being put to practical use. For a long time, the options were restricted to yellow, green and red LEDs. Blue and white LEDs are now available. The luminous efficacy of the blue and white LEDs is comparable to that of thermal radiators.
As further developments are made, the luminous efficacy of these products will increase and this will revolutionise the lighting industry and lighting applications.
