Question

What kind of light does a gallium phosphide diode emit?

Answer 1

Gallium phosphide diodes primarily emit green light. Their light-emitting principle involves the release of energy when electrons and holes recombine, producing light of a specific wavelength. Different semiconductor materials emit different colors of light due to differences in their band structures.

Answer 2

Gallium phosphide diodes (GaP LEDs) emit red, yellow, or green light, depending on the type of impurities used for doping: Pure GaP, co-doped with Zn-O → Red light

GaP doped with nitrogen (N) → Yellow/yellow-green light

GaP doped with sulfur (S) or selenium (Se) → Green light

In summary: GaP was a commonly used early LED material capable of emitting red, yellow, and green light, but blue light cannot be achieved with GaP.