High optical power and low-efficiency droop blue light-emitting diodes using compositionally step-graded InGaN barrier
Journal
Electronics Letters
Journal Volume
51
Journal Issue
15
Pages
1187-1188
Date Issued
2015
Author(s)
Pan, Chih-Chien
Yan, Qimin
Fu, Houqiang
Zhao, Yuji
Wu, Yuh-Renn
Van de Walle, Chris
Nakamura, Shuji
DenBaars, Steven P.
Abstract
A compositionally step‐graded (CSG) InGaN barrier is designed for the active region of c ‐plane blue light‐emitting diodes (LEDs). High external quantum efficiencies of 45, 42, 39 and 36% are achieved at current densities of 100, 200, 300 and 400 A/cm 2 , respectively. Compared with GaN barrier devices, LEDs with CSG InGaN barriers showed higher power, lower operating voltage and smaller wavelength blueshift, compared with GaN barrier LEDs. Owing to the low‐voltage performance, higher wall‐plug efficiency can be achieved for blue LEDs with CSG InGaN barriers.
SDGs
Type
journal article