@S05591@ (often a combination of gallium, arsenic and phosphorous or gallium and nitrogen) containing an n region (where electrons are more numerous than positive charges) separated from a p region (where positive charges are more numerous than negative charges). Upon application of a voltage, charges move and emission of @UT07492@, @VT07496@ or @IT07399@ radiation is produced each time a @C00998@ takes place. Although a LED emits incoherent monochromatic light, normally a very narrow @F02525@ range is obtained.
- This effect is a form of @E01966@.
- The colour depends on the semi-conducting material used, and can be @UT07492@, @VT07496@ or @IT07399@.
- Organic light-emitting devices (OLEDs) contain diodes made of small molecules or made of @M03667@ materials. The latter are sometimes called PLEDs.