Computational upper-limit of directional light emission in nano-LED via inverse design

被引：8

作者：

Chung, Haejun ^{[1
]}

机构：

[1] Soongsil Univ, Dept Elect Engn, Seoul 06978, South Korea

来源：

OPTICS EXPRESS | 2022年 / 30卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

EXTRACTION EFFICIENCY; EMITTING-DIODES; OPTIMIZATION; ENHANCEMENT; COMPACT;

D O I：

10.1364/OE.451008

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate directional light emission in nano-LEDs using inverse design. Standard light-extraction strategies in LEDs have been limited to surface roughening or suppressing guided modes via LED structure modifications, which are insufficient for simultaneously achieving high-light extraction efficiency and directional emission. In this work, we use inverse design to discover high-efficiency directional emitting nano-LEDs. We first investigate the computational upper bounds of directional emission using free-form grayscale material, where material permittivity indicates an intermediate state between air and SiO2. For a narrow emission angle (<+/- 30 degrees), the optimized grayscale design offers 4.99 times enhancement from the planar LED surface. Then, we apply fabrication constraints to our inverse design for discovering a single material (SiO2) based design. The optimized SiO2 surface design shows 4.71 times light extraction (<+/- 30 degrees) improvement compared with the planar configuration. This is a first theoretical demonstration of high light-extraction efficiency and directional emitting nano-LED designs. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

引用

页码：9008 / 9020

页数：13

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