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GaN lattice constant vs the wafer position, along directions A, B, C, and D, deduced from the GaN (0002) XRD peak in the blue LED wafer grown on a specially designed sapphire substrate. The wafer edges are taken as the references.
GaN lattice constants vs deduced from the GaN (0002) and (104) XRD reflection peaks in the blue LED wafer grown on a specially designed substrate.
EL spectra of blue LEDs grown on (a) flat and (b) specially designed substrates.
EL spectral peak position of blue LEDs wafer vs GaN lattice constant .
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