Mg–O Complexes in GaP—A Yellow Diode

A yellow-orange luminescence which peaks at 6030 Å at 300 °K has been observed in (Mg, O)-doped GaP and is attributed to a bound excitonic transition at a nearest-neighbor Mg–O complex. A photoluminescent efficiency at low temperatures of ∼20% has been measured and yellow diodes of external quantum efficiency ≃0.1% at 77 °K have been fabricated.