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Representative x-ray diffraction pattern of the GaN powder doped with Er after the removal of Bi. All peaks match with wurtzite GaN structure without any free Ga, Bi, or Er detected.
Scanning electron microscopy image of the morphology of the synthesized GaN:Er powder; particles range from and platelet particles are the majority.
Photoluminescence (PL) spectra of Er-doped GaN powder. The PL is performed at room temperature with the Ar laser line at . Two narrow emissions at 537 and are two characteristic inner shell transitions in ions.
(Color online) (a) Scanning electron microscopy image of particles of GaN doped with Er. (b) Microprobe mapping analysis on these particles. Different colors indicate the relative Er concentration in that GaN particle. Red is the highest concentration and blue is the lowest. The white bright spot indicate very high Er concentration and possible second phase is suspected.
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