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We studied the blue luminescence at about 2.9eV in unintentional doped GaN films, which were grown on (0001) oriented sapphire substrates by MOCVD. The intensity ratio of the blue luminescence to the band-edge emission is large in high compensation ratio's GaN films, and it decreases with the decrease of the compensation ratio. The FWHM of double-crystal X-ray diffraction obviously increases with...
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