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research-article

Cylindrical Tuber Encapsulant Layer Realization by Patterned Surface for COB-LEDs Packaging

[+] Author and Article Information
Xingjian Yu

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
yuxingjian@hust.edu.cn

Run Hu

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
hurun@hust.edu.cn

Ruikang Wu

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
ruikangwu@hust.edu.cn

Bin Xie

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
binxie@hust.edu.cn

Xiaoyu Zhang

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
382902691@qq.com

Xiaobing Luo

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
luoxb@hust.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4042982 History: Received September 22, 2018; Revised November 20, 2018

Abstract

In this study, we realized a cylindrical tuber silicone layer for improving the light efficiency of chip-on-board light-emitting diodes (COB-LEDs) by fabricating patterned LED substrate with both silicone-wetting and silicone-repellency surfaces. To realize silicone-repellency surface, low surface energy modified nano-silica particles were prepared and deposited on the LED substrate to form porous hierarchical structure. Light efficiency enhancement for blue light COB-LEDs with pure cylindrical tuber silicone layer and white light COB-LEDs with phosphor-silicone composite layer was studied. The results show that for blue light COB-LEDs with pure cylindrical tuber silicone layer, the light efficiency increases with the contact angle and a highest light efficiency enhancement 0f 62.6% was achieved at 90° when compared to the flat silicone layer. For white light COB-LEDs at CCT of ~5500K, the cylindrical tuber silicone layer enhances the light efficiency by 13.6% when compared to the conventional flat phosphor layer.

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