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采用传输矩阵法对Al0.5Ga0.5As-AlAs材料的发光二极管分布布拉格反射器进行入射角的反射光谱研究,计算发现反射偏振光p和s随入射角的增大呈“V”形变化,在49.8°处有最小反射值。不同入射介质[以空气和限制层(Al0.7Ga0.3)0.5In0.5P材料]下的反射光谱受入射角的影响差异很大,其中入射角对空气入射介质的反射谱影响较小,由0°入射的反射率88.13%降至45°的84.94%,反射峰值波长蓝移仅10 nm;但入射角对(Al0.7Ga0.3)0.5In0.5P入射介质的反射谱影响很大,仅从0°到45°入射,反射率降幅就超过45%,反射峰值波长蓝移超过127 nm。为了减缓这种影响,提出了多波长布拉格反射器结构设计。计算表明多波长分布布拉格反射器在0ο~45°的入射角内比传统的分布布拉格反射器有更好的光谱特性,这对提高发光二极管的出光效率有现实意义。
The reflection spectra of incident Bragg reflector of Al0.5Ga0.5As-AlAs are studied by transmission matrix method. The results show that the reflection polarized light (p and s) changes with “V” 49.8 ° at the minimum reflection value. The reflection spectra of different incident media [air and confinement layer (Al0.7Ga0.3) 0.5In0.5P] vary greatly depending on the incident angle, and the incident angle has little effect on the reflection spectrum of the air incident medium. From The reflectivity at 0 ° incidence decreased from 88.13% to 84.94% at 45 °, and the peak reflection wavelength shifted blue by only 10 nm. However, the incident angle greatly affected the reflection spectra of (Al0.7Ga0.3) 0.5In0.5P incident medium and only From 0 ° to 45 ° incidence, the reflectance decreases more than 45% and the peak reflection wavelength shifts more than 127 nm. In order to mitigate this effect, a multi-wavelength Bragg reflector structure design is proposed. The calculated results show that the multi-wavelength distributed Bragg reflector has better spectral characteristics than the traditional distributed Bragg reflector at the incident angle of 0 ° -45 °, which is of practical significance to improve the light-emitting efficiency of the LED.