Enhanced Light Emission of Micro LEDs Using Graphene-Connected Micropillar Structures and Ag/SiO2 Nanoparticles
Journal article, 2025
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.
micro-LED
localized surface plasmon resonance
graphene
micropillar
Author
Aoqi Fang
Beijing University of Technology
Qingqing Li
Fuzhou University
Jixin Liu
Beijing University of Technology
Zaifa Du
Weifang University
Peng Hao Tang
Beijing University of Technology
Hao Xu
Beijing University of Technology
Y. Xie
Beijing University of Technology
Jibin Song
Beijing University of Chemical Technology
Kaixin Zhang
Fuzhou University
Tianxi Yang
Fuzhou University
Qun Yan
Fuzhou University
Weiling Guo
Beijing University of Technology
Jie Sun
Fuzhou University
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
ACS Photonics
2330-4022 (eISSN)
Vol. In PressSubject Categories (SSIF 2025)
Materials Chemistry
Other Electrical Engineering, Electronic Engineering, Information Engineering
Condensed Matter Physics
DOI
10.1021/acsphotonics.4c01514