基于阴极发光的绿色发光二极管中正交偶极子与表面等离子体耦合机制的研究

Study on the Coupling Mechanism of the Orthogonal Dipoles with Surface Plasmon in Green LED by Cathodoluminescence.

作者信息

Feng Yulong, Chen Zhizhong, Jiang Shuang, Li Chengcheng, Chen Yifan, Zhan Jinglin, Chen Yiyong, Nie Jingxin, Jiao Fei, Kang Xiangning, Li Shunfeng, Yu Tongjun, Zhang Guoyi, Shen Bo

机构信息

State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.

Dongguan Institute of Optoelectronics, Peking University, Guangdong, Dongguan 523808, China.

出版信息

Nanomaterials (Basel). 2018 Apr 16;8(4):244. doi: 10.3390/nano8040244.

DOI:10.3390/nano8040244

PMID:29659499

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5923574/

Abstract

We analyzed the coupling behavior between the localized surface plasmon (LSP) and quantum wells (QWs) using cathodoluminescence (CL) in a green light-emitting diodes (LED) with Ag nanoparticles (NPs) filled in photonic crystal (PhC) holes. Photoluminescence (PL) suppression and CL enhancement were obtained for the same green LED sample with the Ag NP array. Time-resolved PL (TRPL) results indicate strong coupling between the LSP and the QWs. Three-dimensional (3D) finite difference time domain (FDTD) simulation was performed using a three-body model consisting of two orthogonal dipoles and a single Ag NP. The LSP–QWs coupling effect was separated from the electron-beam (e-beam)–LSP–QW system by linear approximation. The energy dissipation was significantly reduced by the z-dipole introduction under the e-beam excitation. In this paper, the coupling mechanism is discussed and a novel emission structure is proposed.

摘要

我们在填充有银纳米颗粒（NP）的光子晶体（PhC）孔的绿光发光二极管（LED）中，利用阴极发光（CL）分析了局域表面等离子体激元（LSP）与量子阱（QW）之间的耦合行为。对于具有银NP阵列的同一绿色LED样品，获得了光致发光（PL）抑制和CL增强。时间分辨光致发光（TRPL）结果表明LSP与QW之间存在强耦合。使用由两个正交偶极子和单个银NP组成的三体模型进行了三维（3D）有限差分时域（FDTD）模拟。通过线性近似将LSP-QW耦合效应与电子束（e束）-LSP-QW系统分离。在电子束激发下，通过引入z偶极子，能量耗散显著降低。本文讨论了耦合机制并提出了一种新型发射结构。