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Temperature dependence of photoluminescence spectra from multiple Er3+ sites in Er-implanted undoped and Mg-doped GaN
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Materials Science and Engineering Vol.B81, pp136-139 (2001)
S. Kim, S.J. Rhee, J.O. White, A.M. Mitofsky, X. Li, G.C. Papen, J.J. Coleman, and S.G. Bishop