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The luminescence of vapor-grown GaN doped with Be or Mg shows deep emission bands in the yellow-green (Be) or blue-violet (Mg) wavelength regions in addition to the near-gap features previously recognized in Zn- and Cd-doped GaN. The crystals are of high resistivity at high Be or Mg doping levels.
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Ilegems et al. (1973) studied this question.
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