利用金属光栅提高LED发光效率的研究  

Research on improving LED luminous efficiency by using metal grating

作　　者：江孝伟 朱震[3] 郑盛梅 JIANG Xiaowei;ZHU Zhen;ZHENG Shengmei(College of Information Engineering, Quzhou College of Technology, Quzhou 324000, China;Key Laboratory of Opto-electronics Technology Ministry of Education, Beijing University of Technology, Beijing 100124, China;Management Center of Equipment and Training, Quzhou College of Technology, Quzhou 324000, China)

机构地区：[1]衢州职业技术学院信息工程学院,衢州324000 [2]北京工业大学光电子技术教育部重点实验室,北京100124 [3]衢州职业技术学院设备与实训管理中心,衢州324000

出　　处：《激光技术》2022年第3期368-373,共6页Laser Technology

基　　金：国家自然科学基金资助项目(61575008;61650404);江西省自然科学基金资助项目(20171BAB202037);江西省教育厅科技基金资助项目(GJJ170819);衢州市科技计划指导性项目(2020006);衢州市科技计划资助项目(2019K20)。

摘　　要：为了提高发光二极管(LED)的发光效率,在LED出光面放置金属光栅,采用时域有限差分法进行了理论分析和模拟计算。结果表明,对光栅优化后,金属光栅对波长460nm的透射率接近1,可提高LED的光提取效率;在此波长下,可同时激发局域表面等离激元和表面等离极化激元,有助于提高LED内量子效率;且具有金属光栅结构的LED的发光效率是仅在出光面放置一层Ag薄层的LED的30倍。该研究为未来制备高发光效率的LED提供了理论指导。In order to improve the luminous efficiency of light-emitting diode(LED),a metal grating was placed on the light emitting surface of LED.The theoretical analysis based on finite difference time domain method shows that the transmittance of metal grating to the wavelength of 460nm is close to 1 after the optimization of the grating,and the light extraction efficiency of LED can be improved.The optimized metal grating can simultaneously excite surface plasmons polariton and the localized surface plasmon at 460nm,which is helpful to improve the internal quantum efficiency of LED.The luminous efficiency of LED with metal grating structure at 460nm is 30 times higher than that of LED with only a thin layer of Ag on light-emitting surface.The research can provide theoretical guidance for the preparation of high luminous efficiency LED in the future.

关 键 词：光学器件 发光二极管 金属光栅 发光效率 内量子效率 光提取效率 

分 类 号：TN312[电子电信—物理电子学]