Enhanced Light Emission of Micro LEDs Using Graphene-Connected Micropillar Structures and Ag/SiO2 Nanoparticles

IF 6.5 1区物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Photonics Pub Date : 2025-02-11 DOI:10.1021/acsphotonics.4c01514

Aoqi Fang, Qingqing Li, Jixin Liu, Zaifa Du, Penghao Tang, Hao Xu, Yiyang Xie, Jibin Song, Kaixin Zhang, Tianxi Yang, Qun Yan, Weiling Guo, Jie Sun

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Abstract

This paper reports on a micropillar micro-light-emitting diode (MP-μLED) enhanced by a graphene conductive layer and SiO₂-coated Ag nanoparticles (Ag/SiO₂ NPs). The micropillar structure enables direct contact between Ag/SiO₂ NPs and the quantum well (QW), leveraging localized surface plasmon resonance (LSPR) to enhance the emission of QW. The SiO₂ coating on Ag serves as an insulating layer, preventing energy leakage through electron tunneling between QW–Ag and Ag–Ag interfaces. Graphene, used as a transparent conductive layer, integrates the individual micropillars into a cohesive structure, ensuring efficient current spreading and uniform light emission. Compared to plane μLEDs of the same mesa size, the MP-μLED with graphene transparent electrodes and LSPR enhancement shows an improvement of 44% in external quantum efficiency (EQE) and 45% in wall plug efficiency (WPE) at a current density of 1000 A/cm². This study demonstrates the significant application potential of LSPR and micropillar structures in μLED technology.

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来源期刊

ACS Photonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

11.90

自引率

5.70%

发文量

438

审稿时长

2.3 months

期刊介绍： Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.