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Enhanced Light Extraction of DUV LEDs by Using a Quartz Lens With Three-Dimensional Structure | IEEE Journals & Magazine | IEEE Xplore

Enhanced Light Extraction of DUV LEDs by Using a Quartz Lens With Three-Dimensional Structure


Abstract:

AlGaN based deep ultraviolet light-emitting diodes (DUV LEDs) have wide applications in many fields, such as air and water purification, disinfection, and biochemical ins...Show More

Abstract:

AlGaN based deep ultraviolet light-emitting diodes (DUV LEDs) have wide applications in many fields, such as air and water purification, disinfection, and biochemical inspection. However, the wall plug efficiency (WPE) of DUV LEDs is relatively low for these applications, which is due to the low light extraction efficiency (LEE) yielding limited light output from LED package. In this work, we proposed a quartz lens with three-dimensional (3D) structure to enhance the light extraction of DUV LEDs. The optical models of DUV LEDs were established and the optical performances of DUV LEDs were investigated by using optical simulation. The DUV LEDs with the 3D quartz lens exhibit higher light efficiency than those with traditional quartz lens structure. Compared with the traditional structure, the light output power of the 3D lens structure is enhanced by 25.93% at the current of 140 mA and the packaged DUV LED can achieve a wide light angle of 153.2°. It is attributed to the significant light extraction enhancement of the sidewall emission from DUV LED chip.
Published in: IEEE Photonics Technology Letters ( Volume: 33, Issue: 24, 15 December 2021)
Page(s): 1403 - 1406
Date of Publication: 27 October 2021

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