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- W2902401401 abstract "Abstract In this study unintentionally doped GaN grown by hydride vapor phase epitaxy that exhibits a sharply delimited region of green color was investigated. Optical analysis was performed by absorption and photoluminescence spectroscopy. An absorption band between 1.5 and 2.0 eV was found to be responsible for the green color and was related to a sharp emission at 1.193 eV by luminescence and excitation spectroscopy. The appearance of both optical signatures in the region of green color was related to an increase of Cr contamination detected by secondary ion mass spectrometry. We propose that the origin of green color as well as the emission line at 1.193 eV is attributed to internal transitions of Cr 4 + ." @default.
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- W2902401401 date "2019-03-01" @default.
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- W2902401401 title "Green coloring of GaN single crystals introduced by Cr impurity" @default.
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- W2902401401 doi "https://doi.org/10.1016/j.jlumin.2018.11.044" @default.
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