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A Novel Liquid Packaging Structure of Deep-Ultraviolet Light-Emitting Diodes to Enhance the Light-Extraction Efficiency

1
Department of Photonics and Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
2
Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, Xiamen University, Xiamen 361005, China
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(4), 203; https://doi.org/10.3390/cryst9040203
Received: 1 March 2019 / Revised: 30 March 2019 / Accepted: 4 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue GaN-Based Optoelectronic Materials and Light Emitting Devices)
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Abstract

To realize high-efficiency, AlGaN-based, deep-ultraviolet light-emitting diodes (DUV-LEDs), enhancing their light-extraction efficiency and reducing thermal resistance is very crucial. We proposed a liquid packaging structure that could enhance optical power by 27.2% and 70.7% for flat type and lens type 281-nm DUV-LEDs, respectively. A significant improvement effect at different wavelengths, such as 268 nm and 310 nm, was also observed. Furthermore, using the liquid packaging structure, the thermal resistance was reduced by 30.3% compared to the conventional structure. Finally, the reliability of liquid packaging DUV-LEDs was tested. The light output maintenance of liquid packaging DUV-LEDs was compared to the conventional structure. View Full-Text
Keywords: deep-ultraviolet light emitting diode; silicone oil; liquid packaging deep-ultraviolet light emitting diode; silicone oil; liquid packaging
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kang, C.-Y.; Lin, C.-H.; Wu, T.; Lee, P.-T.; Chen, Z.; Kuo, H.-C. A Novel Liquid Packaging Structure of Deep-Ultraviolet Light-Emitting Diodes to Enhance the Light-Extraction Efficiency. Crystals 2019, 9, 203.

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