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InGaN films were grown on GaN films with a high indium source flow rate and high growth temperatures between 780°C and 830°C. Strong and sharp band-edge (BE) emissions between 400 nm and 445 nm were observed, while deep-level emissions were barely observed in photoluminescence (PL) measurements at room temperature. The full width at half-maximum (FWHM) of the BE emissions was about 70 meV. The FWHM of the double-crystal X-ray rocking curve (XRC) from the InGaN films was about 8 minutes. This value of FWHM was the smallest one ever reported for InGaN films, and was almost the same as that of the GaN films which were used as the substrate.
Nakamura et al. (Thu,) studied this question.