Abstract
An InGaN/GaN blue light-emitting diode (LED) structure and an InGaN/GaN blue-violet LED structure were grown sequentially on the same sapphire substrate by metal—organic chemical vapor deposition. It was found that the insertion of an -type AlGaN layer below the dual blue-emitting active layers showed better spectral stability at the different driving current relative to the traditional -type AlGaN electron-blocking layer. In addition, color rendering index of a phosphor-converted white LED based on a dual blue-emitting chip with -type AlGaN reached 91 at 20 mA, and Commission Internationale de L’Eclairage coordinates almost remained at the same point from 5 to 60 mA.
©2012 Optical Society of America
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