ZnO Nano-arrays on High Power Blue LED Chip for Enhanced Light Extraction Efficiency

doi:10.3724/SP.J.1077.2012.11499

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (7): 716-720.DOI: 10.3724/SP.J.1077.2012.11499

• Research Paper • Previous Articles Next Articles

ZnO Nano-arrays on High Power Blue LED Chip for Enhanced Light Extraction Efficiency

XU Bing¹, ZHAO Jun-Liang¹, ZHANG Jian-Ming¹, SUN Xiao-Wei¹, ZHUGE Fu-Wei², LI Xiao-Min²

(1. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Department of Applied Physics, School of Science, Tianjin University, Tianjin 300072, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai 200050, China)

Received:2011-08-11 Revised:2011-10-11 Published:2012-07-20 Online:2012-06-06
About author:XU Bing. E-mail: bingxu@tju.edu.cn
Supported by:
The State Key Laboratory of Chinese Academy of Science High Performance Ceramics and Superfine Microstructures Program (SKL201012SIC); National Natural Science Foundation of China(61006037, 61076015)

Abstract

Abstract: ZnO nano-arrays were grown on high power GaN blue LED chip by low-cost chemical solution methods, which aimed to enhance the light extraction efficiency of LED chip. Various morphology was achieved by adjusting the concentration of ammonia and Zn²⁺ in the growth solution. With different growth solution, ZnO nano-arrays exhibited different morphologies and densities. The effect of nano-array morphology on the light extraction performance of the ZnO nano-array coated LED chip were studied. The mechanism of light extraction efficiency enhancement by nano-arrays was also discussed based on the experimental results. The result shows that ZnO nano-arrays with higher density and cone-shaped morphology are favorable for the improvement of light extraction in LED chip. ZnO nano-arrays grown at the optimum conditions can enhance the light extraction of LED chip by more than 60%. Meanwhile, ZnO nano-arrays have no significant effect on the electrical properties and electroluminescence stability of LED chip.

Key words: ZnO nano-arrays, high power LED chip, light extraction efficiency, chemical solution method

CLC Number:

O472

XU Bing, ZHAO Jun-Liang, ZHANG Jian-Ming, SUN Xiao-Wei, ZHUGE Fu-Wei, LI Xiao-Min. ZnO Nano-arrays on High Power Blue LED Chip for Enhanced Light Extraction Efficiency[J]. Journal of Inorganic Materials, 2012, 27(7): 716-720.

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ZnO Nano-arrays on High Power Blue LED Chip for Enhanced Light Extraction Efficiency

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