激光与光电子学进展, 2018, 55 (8): 082302, 网络出版: 2018-08-13
光栅形状对发光二极管光提取效率的影响 下载: 610次
Influence of Grating Shape on LED Light Extraction Efficiency
光学器件 发光二极管 光提取效率 透射率 倒装 optical devices light-emitting diode light extraction efficiency transmissivity flip chip
摘要
为提高发光二极管(LED)的光提取效率,分析了光栅形状(矩形、等腰梯形、等腰三角形)对提取效率的影响;基于等效介质理论和严格耦合波法,优化了集成不同形状光栅的LED。利用有限时域差分法,模拟计算了三种不同最优结构LED的光提取效率。研究结果表明,在0.4~0.5 μm波长范围内,等腰三角形光栅倒装LED的光提取效率均在70%以上,最高可达77.75%,而梯形光栅倒装LED的光提取效率最低,最高仅能达到58%。
Abstract
In order to enhance the light-emitting diode (LED) light extraction efficiency, the influences of grating shapes (rectangle, isosceles trapezoid and isosceles triangle) on the extraction efficiency are analyzed. The LED integrated with different shaped gratings is optimized based on the equivalent medium theory and the rigorous coupled-wave analysis method. The light extraction efficiencies for three LEDs with different optimal structures are simulated by the finite difference time domain method. The research results show that, when the wavelength is within the range of 0.4-0.5 μm, the light extraction efficiency of a flip-chip LED with an isosceles triangle shaped grating is larger than 70%, and the maximum is up to 77.75%, while that of a flip-chip LED with a trapezoid shaped grating is the lowest and its maximum is only 58%.
方晓敏, 江孝伟, 赵建伟. 光栅形状对发光二极管光提取效率的影响[J]. 激光与光电子学进展, 2018, 55(8): 082302. Fang Xiaomin, Jiang Xiaowei, Zhao Jianwei. Influence of Grating Shape on LED Light Extraction Efficiency[J]. Laser & Optoelectronics Progress, 2018, 55(8): 082302.