Liu Xingxing, Mou Yun, Wang Hao, Liang Renli, Wang Xinzhong, Peng Yang, Chen Mingxiang
Appl Opt. 2018 Sep 1;57(25):7325-7328. doi: 10.1364/AO.57.007325.
Deep ultraviolet light-emitting diodes (DUV-LEDs) have become a promising UV light source for sterilization, disinfection, and purification. However, the challenge in practical application of DUV-LEDs still remains in their low light efficiency. In this paper, we propose an optimized aluminum (Al) reflector for the light extraction enhancement of DUV-LEDs. The optical model of DUV-LEDs was established, and the optical simulations were performed to achieve the optimized reflector. The DUV-LEDs exhibit the highest light efficiency when the reflector has the optimized feature sizes with an angle of 60°, a height of 2.0 mm, and an internal radius of 2.5 mm. Furthermore, the optimized reflector with different reflectance was fabricated and applied for the packaging of DUV-LEDs. Consequently, the light output powers of DUV-LEDs are enhanced by 28.8%, 37.0%, and 43.8%, respectively, by using the different reflectors at the driving current of 100 mA. It is attributed to the remarkable reflection effect of the Al reflector, which increases the light extraction of the sidewall emission from the DUV-LED chip.
深紫外发光二极管（DUV-LEDs）已成为一种用于杀菌、消毒和净化的有前景的紫外光源。然而，DUV-LEDs实际应用中的挑战仍然在于其低光效率。在本文中，我们提出了一种用于提高DUV-LEDs光提取效率的优化铝（Al）反射器。建立了DUV-LEDs的光学模型，并进行了光学模拟以实现优化的反射器。当反射器具有角度为60°、高度为2.0毫米且内半径为2.5毫米的优化特征尺寸时，DUV-LEDs表现出最高的光效率。此外，制造了具有不同反射率的优化反射器并将其应用于DUV-LEDs的封装。因此，在100毫安的驱动电流下，使用不同的反射器时，DUV-LEDs的光输出功率分别提高了28.8%、37.0%和43.8%。这归因于Al反射器显著的反射效果，它增加了DUV-LED芯片侧壁发射的光提取。
