Efficiency Improvement of UVC LEDs by Epoxy Molding Compound With Metallized Reflector

We propose an epoxy molding compound (EMC) encapsulation method based on a metallized reflector to enhance light extraction of deep ultraviolet light-emitting diodes (DUV-LEDs). From the optical simulation, the highest light output efficiency of the DUV-LEDs is measured when the angle of the metalli...

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Bibliographic Details
Published in:IEEE photonics technology letters 2023-12, Vol.35 (24), p.1387-1390
Main Authors: Wan, Chuiming, Zeng, Zhaoming, Xiao, Guowei, Lan, Yian, Li, Chencheng, Lin, Hongwei, Wang, Hong
Format: Article
Language:English
Subjects:
Ceramics
deep ultraviolet light-emitting diodes (DUV-LEDs)
Electromagnetic compatibility
epoxy molding compound (EMC)
Light emitting diodes
Light extraction
metallized reflector
Metallizing
Molding compounds
Photonics
Power generation
Reliability
Substrates
Thermal resistance
Ultraviolet radiation
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Summary:We propose an epoxy molding compound (EMC) encapsulation method based on a metallized reflector to enhance light extraction of deep ultraviolet light-emitting diodes (DUV-LEDs). From the optical simulation, the highest light output efficiency of the DUV-LEDs is measured when the angle of the metallied reflector is 35° and the height is 0.5-mm. The optimized EMC structure is fabricated for application to DUV-LEDs packaging. The light output power of the EMC metallized reflector is improved by 14.3% compared to the conventional ceramic package at 20-mA. The thermal resistance of the EMC is 18.16-K/W. Furthermore, after aging tests at 60 °C and 60 °C, 90 %RH for 1000h, the relative light output power of the EMC metallized reflector is decreased by 12% and 14%, respectively.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2023.3325394