High-efficiency GaN-based visible flip-chip miniaturized-light emitting diodes (FC mini-LEDs) are desirable for developing white LED-backlit liquid crystal displays. Here, we propose a full-angle Ti₃O₅/SiO₂ distributed Bragg reflector (DBR) for blue and green FC mini-LEDs to enhance the device performance. The proposed full-angle Ti₃O₅/SiO₂ DBR is composed of different single-DBR stacks optimized for central wavelength in blue, green, and red light wavelength regions, resulting in wider reflective bandwidth and less angular dependence. Furthermore, we demonstrate two types of GaN-based FC mini-LEDs with indium-tin oxide (ITO)/DBR and Ag/TiW p-type ohmic contacts. Experimental results exhibit that the reflectivity of full-angle DBR is higher than that of Ag/TiW in the light wavelength range of 420 to 580 nm as the incident angle of light increases from 0° to 60°. As a result, the light output powers (LOPs) of blue and green FC mini-LEDs with ITO/DBR are enhanced by 7.7% and 7.3% in comparison to blue and green FC mini-LEDs with Ag/TiW under an injection current of 10 mA. In addition, compared with FC mini-LED with Ag/TiW, light intensity of FC mini-LED with ITO/DBR is improved in side direction, which is beneficial to mix light in backlight system of liquid crystal displays (LCDs).

中文翻译：

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具有高反射全角分布式布拉格反射器的基于 GaN 的可见倒装芯片 mini-LED 的性能增强

高效 GaN 基可见光倒装芯片微型发光二极管 (FC mini-LED) 是开发白光 LED 背光液晶显示器的理想选择。在这里，我们提出了一种用于蓝色和绿色 FC 迷你 LED的全角 Ti ₃ O ₅ /SiO ₂分布式布拉格反射器 (DBR)，以提高器件性能。建议的全角 Ti ₃ O ₅ /SiO ₂DBR 由针对蓝光、绿光和红光波长区域的中心波长优化的不同单 DBR 堆栈组成，从而导致更宽的反射带宽和更少的角度依赖性。此外，我们展示了两种类型的具有氧化铟锡 (ITO)/DBR 和 Ag/TiW p 型欧姆接触的基于 GaN 的 FC mini-LED。实验结果表明，随着光的入射角从0°增加到60°，全角DBR的反射率在420至580 nm的光波长范围内高于Ag / TiW。因此，在注入电流为10 毫安。此外，与Ag/TiW的FC mini-LED相比，