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= GaP
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<Gallium phosphide> is a compound <semiconductor> of <gallium> and <phosphorus>, with chemical formula $\mathrm{GaP}$. Its <electronic band structure> determines which <photon> <energies> can excite mobile <charge carriers> and which transitions can produce <light>.

Its bulk <band gap> is indirect: a transition near the lowest gap involves a change of crystal <momentum>, so a <phonon> or another momentum-transfer mechanism matters. Consequently a <band gap> value alone does not predict an efficient <light-emitting diode>. Impurity states, radiative and <nonradiative recombination>, and extraction of emitted <photons> all affect the observable device output.


 Gallium phosphide (source code)