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Green InGaN/GaN based light-emitting diodes (LEDs) are fabricated both on planar and wet-etched patteed sapphire substrates by metalorganic vapour phase epitaxy (MOVPE). Their photoluminescence (PL) properties of the two samples are studied. The results indicate that the PL integral intensity of the green LED on the patteed substrate is nearly two times of that on the planar one within the whole measured temperature range. The enhanced PL intensity in the green LED on the patteed substrate is shown completely contributed from the extraction efficiency, but not from the inteal quantum efficiency. The conclusion is supported by temperature-dependent PL analysis on the two samples, and the mechanisms are discussed.