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.

中文翻译：

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使用具有三维结构的石英透镜增强 DUV LED 的光提取

AlGaN基深紫外发光二极管（DUV LED）在空气和水净化、消毒和生化检测等诸多领域有着广泛的应用。然而，对于这些应用，DUV LED 的壁插效率 (WPE) 相对较低，这是由于低光提取效率 (LEE) 导致 LED 封装的光输出有限。在这项工作中，我们提出了一种具有三维 (3D) 结构的石英透镜，以增强 DUV LED 的光提取。建立了深紫外 LED 的光学模型，并通过光学仿真研究了深紫外 LED 的光学性能。具有 3D 石英透镜的 DUV LED 比具有传统石英透镜结构的 DUV LED 具有更高的光效。与传统结构相比，3D透镜结构的光输出功率在140mA的电流下提高了25.93%，封装的DUV LED可以实现153.2°的宽光角。这归因于 DUV LED 芯片侧壁发射的显着光提取增强。