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Lin R.-M.,Chang Gung University | Yu S.-F.,National Cheng Kung University | Chang S.-J.,National Cheng Kung University | Chiang T.-H.,National Cheng Kung University | And 2 more authors.
Applied Physics Letters | Year: 2012

In this study, we observed a dramatic decrease in the efficiency droop of InGaN/GaN light-emitting diodes after positioning a p-InGaN insertion layer before the p-AlGaN electron-blocking layer. The saturated external quantum efficiency of this device extended to 316 mA, with an efficiency droop of only 7% upon increasing the operating current to 1 A; in contrast, the corresponding conventional light-emitting diode suffered a severe efficiency droop of 42%. We suspect that the asymmetric carrier distribution was effectively mitigated as a result of an improvement in the hole injection rate and a suppression of electron overflow. © 2012 American Institute of Physics.

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