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Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices op- erating in the visible spectral region. A major advantage of LMH-light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biex- citons, trions, quintons) by controlling the charge density. However, these devices have an EL quan- tum efficiency as low as∼10−4%. Here, we show that the superacid bis-(triuoromethane)sulfonimide (TFSI) treatment of monolayer WS2-LEDs boosts EL quantum efficiency by over one order of magnitude at room temperature. Non-treated devices emit light mainly from negatively charged ex- citons, while the emission in treated ones predominantly involves radiative recombination of neutral excitons. This paves the way to tunable and efficient LMH-LEDs.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Layered material heterostructures, electroluminescent devices, quantum efficiency

Date published: 2024-04-01

Publisher: IOP Publishing

Journal:

• 2D Materials (ISSN: 20531583) vol. 11 issue. 2 025017

Funding:

• ERC Hetero2D
• EU
• EP EP/K017144/1
• EPSRC

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1088/2053-1583/ad1a6a

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Updated at: 2025-02-14 12:30:37 +0900

Published on MDR: 2025-02-14 12:30:38 +0900