Abstract
Ga 14 N and Ga 15 N were grown to study the isotopic effect on GaN lattice constants and band gap energy. It was shown that Ga 15 N has smaller lattice constants a and c at room temperature. However, the thermal expansion coefficients of Ga 15 N are larger than those of Ga 14 N up to 600 °C. Photoluminescence at 4.5–50 K implies a wider band gap in Ga 15 N, presumably due to its smaller unit cell at low temperature, and a weaker band gap renormalization effect via phonon–electron interaction.
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