光栅和随机粗糙表面对微型LED光提取效率的提升作用

Enhancement of light extraction efficiency of Micro-LEDs by using gratings and randomly roughened surface

在显示技术日益发展的今天,微型LED作为下一代光源,在技术指标上具有绝对的优势。但是,目前光提取效率的研究主要集中于LED,而针对微型LED的却很少。通过对光栅和随机粗糙表面的数值计算,分别研究了梯形结构的光栅和基于W-M分形函数的随机粗糙表面对微型LED光提取效率的影响。结果表明,梯形光栅可以将光提取效率提升到57.3%,二维随机粗糙表面可以将光提取效率提升至49.52%,三维随机粗糙表面可以实现52.63%的光提取效率。与无此类结构的器件相比,这些对出光面的处理均不同程度地对光提取效率有提升作用,可作为微型LED设计的参考。

With the development of display technology,Micro-LED,as the next generation light source,has absolute advantages in technical indicators.However,at present,the research on light extraction efficiency mainly focuses on LED,but there is little research on Micro-LED.Through the numerical calculation of grating and random rough surface,the effects of trapezoidal grating and random rough surface based on W-M fractal function on the light extraction efficiency of Micro-LED are studied respectively.The results show that trapezoidal grating can improve the light extraction efficiency to 57.3%,two-dimensional random rough surface can improve the light extraction efficiency to 49.52%,and three-dimensional random rough surface can achieve 52.63%.Compared with the devices without such structure,these processing of the light emitting surface can improve the light extraction efficiency to varying degrees,which can be used as a reference for the design of Micro-LED.