Silver nanoparticle-induced enhancement of light extraction in two-dimensional light-emitting diodes

Tianqi Liu, Qiang Fu, Yuanzhe Li, Xu Han, Shixuan Wang, Takashi Taniguchi, Kenji Watanabe, Dongyang Wan, Qi Zhang, Yingbo Zhao, Zhenhua Ni, Fei Ding, Zhenliang Hu, Xueyong Yuan, Junpeng Lu

Research output: Contribution to journalJournal articleResearchpeer-review


Monolayer transition metal dichalcogenides (TMDCs) with direct bandgaps are considered promising candidates for building light-emitting diodes (LEDs). One crucial indicator of their performance is the brightness of electroluminescence (EL). In this study, we fabricate WS2-based LEDs that make full use of the assistance of effective transient-mode charge injection. By introducing self-assembled silver nanoparticles (NPs) on top of the LED, the extraction efficiency is significantly improved, with a 2.9-fold EL enhancement observed in the experiment. Full-wave simulations further confirm that the improvement comes from the scattering capability of silver NPs, with results qualitatively fitting the experiment. This approach, with its compatibility with van der Waals heterostructures, can be further promoted to enhance the brightness of 2D monolayer TMDC-based LEDs.

Original languageEnglish
JournalOptics Letters
Issue number16
Pages (from-to)4372-4375
Publication statusPublished - 15. Aug 2023

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