Reflection and photoluminescence spectra of boron gallium nitride (BGaN) la
yers were observed. BGaN layers were grown on (0 0 0 1) 6H-SiC substrates w
ithout any buffer layers by metal-organic vapor-phase epitaxy (MOVPE). The
emission peaks that originated from free-exciton recombination were observe
d in these layers. The band-gap energy of the BGaN layer was larger than th
at of the GaN layer. The binding energy of a free exciton in the BGaN layer
was 26 meV, which nearly equals that in GaN. (C) 2000 Elsevier Science B.V
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