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.
Highlights
Deep-ultraviolet light emitting diodes (DUV-LEDs) have been attracting significant attention as a new light source that can replace conventional mercury-based UV lamps in disinfection, chemical decomposition, water and air purification, and food safety control [1,2,3]
Using the liquid packaging structure, the thermal resistance was reduced by 30.3% compared to the conventional structure
Comparing thecolor different packages without silicone oil,that we found that the light output power obvious that the of the chip iswith notand black, which means the DUV
Summary
Deep-ultraviolet light emitting diodes (DUV-LEDs) have been attracting significant attention as a new light source that can replace conventional mercury-based UV lamps in disinfection, chemical decomposition, water and air purification, and food safety control [1,2,3]. The light efficiency and output power of DUV-LED devices are still low. The highest reported external quantum efficiency (EQE) and power output in the ultraviolet C (UVC) range (200–290 nm) is 14.3% and. The mainstream design of DUV-LED packages uses quartz glass as the cover without an encapsulation material inside the cavity [9]. This kind of package structure reduces the light extraction severely and limits the optical performance of DUV-LEDs [10,11]
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