图形衬底增强LED光输出功率.pdf

CHIN. PHYS. LETT. Vol. 26, No. 2 (2009) 028101 Enhanced Photoluminescence of InGaN/GaN Green Light-Emitting Diodes Grown on Patterned Sapphire Substrate * 瑁存檽灏 閮附浼?* 鐜嬫檽鏅 姹磱 璐炬捣寮 闄堝紭 鍛ㄥ潎閾 Beijing national Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190 Green InGaN/GaN based light-emitting diodes (LEDs) are fabricated both on planar and wet-etched patterned 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 patterned 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 patterned substrate is shown completely contributed from the extraction efficiency, but not from the internal quantum efficiency. The conclusion is supported by temperature- dependent PL analysis on the two samples, and the mechanisms are discussed. PACS: 81. 65. Cf, 85. 60. Jb, 85. 40. Hp [3,4] [5鈭?]