Abstract
The advantages of blue light-emitting diodes with an undoped AlxGa1-xN graded layer (x graded from 0.1 to 0) worked as electrons tunneling barrier layer are studied numerically. The energy band diagrams, carrier concentrations, output power, radiative recombination rate and internal quantum efficiency are investigated by using the Crosslight simulation programs. The simulation results show that the structure with a AlGaN graded electron tunneling barrier layer has better performance over the common one, which can be attributed to the significantly increased hole concentration resulting from the pinning effects and the barrier for electrons injection caused by the graded layer. Therefore, the efficiency of hole injection is improved, with which both the IQE and the total lighting power are increased.
© 2012 Optical Society of America
PDF ArticleMore Like This
W.Y. Yan, W. Tian, Y. Yu, H. Xiong, Y.Y. Ding, Y. Tian, J. N. Dai, Y.Y. Fang, Z. H. Wu, and C.Q. Chen
ITh4A.15 Information Optoelectronics, Nanofabrication and Testing (IONT) 2012
Jinhui Tong and Shuti Li
AS3F.5 Asia Communications and Photonics Conference (ACP) 2012
Chao Liu, Taiping Lu, Zhiwei Ren, Xin Chen, Bijun Zhao, Yian Yin, Jinhui Tong, and Shuti Li
AS3F.3 Asia Communications and Photonics Conference (ACP) 2012