Bioinspired micro-/nano-composite structures for simultaneous enhancement of light extraction efficiency and output uniformity in Micro-LEDs

IF 3.9 2区工程技术 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE

Displays Pub Date : 2026-04-01 Epub Date: 2025-11-13 DOI:10.1016/j.displa.2025.103286

Jingyu Liu , Jiawei Zhang , Zhenyou Zou , Yibin Lin , Jinyu Ye , Wenfu Huang , Chaoxing Wu , Yongai Zhang , Jie Sun , Qun Yan , Xiongtu Zhou

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引用次数: 0

Abstract

The strong total internal reflection (TIR) in micro light-emitting diodes (Micro-LEDs) significantly limits light extraction efficiency (LEE) and uniformity of light distribution, thereby hindering their industrial applications. Inspired by the layered surface structures found in firefly lanterns, this study proposes a flexible bioinspired micro-/nano-composite structure that effectively enhances both LEE and the uniformity of light output. Finite-Difference Time-Domain (FDTD) simulations demonstrate that microstructures contribute to directional light extraction, whereas nanostructures facilitate overall optical optimization. A novel fabrication approach integrating grayscale photolithography, mechanical stretching, and plasma treatment was developed, enabling the realization of micro-/nano-composite structures with tunable design parameters. Experimental results indicate a 40.5% increase in external quantum efficiency (EQE) and a 41.6% improvement in power efficiency (PE) for blue Micro-LEDs, accompanied by enhanced angular light distribution, leading to wider viewing angles and near-ideal light uniformity. This advancement effectively resolves the longstanding challenge of balancing efficiency and uniformity in light extraction, thereby facilitating the industrialization of Micro-LED technology.

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生物启发微/纳米复合结构，同时提高光提取效率和输出均匀性

微发光二极管（micro - led）的强全内反射（TIR）严重限制了光提取效率（LEE）和光分布均匀性，从而阻碍了其工业应用。受萤火虫灯笼中发现的分层表面结构的启发，本研究提出了一种灵活的仿生微/纳米复合结构，有效地提高了LEE和光输出的均匀性。时域有限差分（FDTD）模拟表明，微结构有助于定向光提取，而纳米结构有助于整体光学优化。开发了一种集成灰度光刻、机械拉伸和等离子体处理的新型制造方法，实现了具有可调设计参数的微/纳米复合材料结构。实验结果表明，蓝色micro - led的外量子效率（EQE）提高了40.5%，功率效率（PE）提高了41.6%，同时增强了角光分布，从而实现了更宽的视角和接近理想的光均匀性。这一进步有效地解决了平衡光提取效率和均匀性的长期挑战，从而促进了Micro-LED技术的产业化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Displays 工程技术-工程：电子与电气

CiteScore

4.60

自引率

25.60%

发文量

138

审稿时长

92 days

期刊介绍： Displays is the international journal covering the research and development of display technology, its effective presentation and perception of information, and applications and systems including display-human interface. Technical papers on practical developments in Displays technology provide an effective channel to promote greater understanding and cross-fertilization across the diverse disciplines of the Displays community. Original research papers solving ergonomics issues at the display-human interface advance effective presentation of information. Tutorial papers covering fundamentals intended for display technologies and human factor engineers new to the field will also occasionally featured.