B.S.T.J. Briefs: Quantum Efficiency of the Green and Red Electroluminescenceof GaP

Gallium phosphide crystals were grown from polycrystalline material in a solution of gallium contained in evacuated and sealed-off quartz tubes. 1 For the regrowth, the tube with the G a P - G a mixture was heated to 1250°C and cooled at a rate of 1.5°C per minute. After separation of the GaP crystals from the adherent Ga, Zn was diffused into the crystals, Fig. 1 -- Red electroluminescent gallium phosphide crystal photographed in its own light; p-n junction prepared by diffusion of Zn at 800°C for four hours. Length of the straight side of the crystal about 1.5 mm.