Abstract
Green light emission has been directly obtained from Er-doped GaN powder. Er is incorporated into GaN powder through the reaction between molten (Ga+Er) and NH3 at 950–1050°C using Bi as a wetting agent. Photoexcitation with an Ar laser results in strong green emissions from two narrow lines at 537 and 558nm, which are identified as Er transitions from the H11∕22 and S3∕24 levels to the I15∕24 ground state. Microprobe analysis reveals that Er atoms are distributed across powder particles.
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