Enhancing the performance of Quasi-2D perovskite blue light emitting diodes via a WS2 energy matching layer

Bo Zhang; Shuo Ding; Xuanyu Zhang; Lei Qian; Chaoyu Xiang

doi:10.1016/j.cplett.2023.140671

Enhancing the performance of Quasi-2D perovskite blue light emitting diodes via a WS₂ energy matching layer

Bo Zhang, Shuo Ding, Xuanyu Zhang, Lei Qian, Chaoyu Xiang

Department of Mechanical, Materials and Manufacturing Engineering

Research output: Journal Publication › Article › peer-review

Abstract

Due to the deep energy levels, the external quantum efficiency (EQE) of the blue perovskite light-emitting diode (PeLED) is far lower than its green, red, and near-infrared counterparts, which has exceeded 20%. The mismatched energy levels between perovskites and the hole transporting layer (HTL) still hinder the hole injection and consequent improvement of blue PeLED device performance. Here, a two-dimensional material, WS₂ (Tungsten disulfide), was introduced to match the energy levels between perovskites and HTL and enhanced the hole injection. The WS₂ HTL-based perovskite FAPbBr_3-xCl_x blue LED achieved a luminance of 990 cd/m² with an EQE of 3.24%, which surpasses the performance of previously reported for the formamidinium (FA) based system, indicating the potential of WS₂ for PeLEDs.

Original language	English
Article number	140671
Journal	Chemical Physics Letters
Volume	826
DOIs	https://doi.org/10.1016/j.cplett.2023.140671
Publication status	Published - Sept 2023

Keywords

Blue light-emitting diodes
Energy matching
Hole transport layer
Perovskite

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

Access to Document

10.1016/j.cplett.2023.140671

Cite this

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title = "Enhancing the performance of Quasi-2D perovskite blue light emitting diodes via a WS2 energy matching layer",

abstract = "Due to the deep energy levels, the external quantum efficiency (EQE) of the blue perovskite light-emitting diode (PeLED) is far lower than its green, red, and near-infrared counterparts, which has exceeded 20%. The mismatched energy levels between perovskites and the hole transporting layer (HTL) still hinder the hole injection and consequent improvement of blue PeLED device performance. Here, a two-dimensional material, WS2 (Tungsten disulfide), was introduced to match the energy levels between perovskites and HTL and enhanced the hole injection. The WS2 HTL-based perovskite FAPbBr3-xClx blue LED achieved a luminance of 990 cd/m2 with an EQE of 3.24%, which surpasses the performance of previously reported for the formamidinium (FA) based system, indicating the potential of WS2 for PeLEDs.",

keywords = "Blue light-emitting diodes, Energy matching, Hole transport layer, Perovskite",

author = "Bo Zhang and Shuo Ding and Xuanyu Zhang and Lei Qian and Chaoyu Xiang",

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year = "2023",

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doi = "10.1016/j.cplett.2023.140671",

language = "English",

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T1 - Enhancing the performance of Quasi-2D perovskite blue light emitting diodes via a WS2 energy matching layer

AU - Zhang, Bo

AU - Ding, Shuo

AU - Zhang, Xuanyu

AU - Qian, Lei

AU - Xiang, Chaoyu

PY - 2023/9

Y1 - 2023/9

N2 - Due to the deep energy levels, the external quantum efficiency (EQE) of the blue perovskite light-emitting diode (PeLED) is far lower than its green, red, and near-infrared counterparts, which has exceeded 20%. The mismatched energy levels between perovskites and the hole transporting layer (HTL) still hinder the hole injection and consequent improvement of blue PeLED device performance. Here, a two-dimensional material, WS2 (Tungsten disulfide), was introduced to match the energy levels between perovskites and HTL and enhanced the hole injection. The WS2 HTL-based perovskite FAPbBr3-xClx blue LED achieved a luminance of 990 cd/m2 with an EQE of 3.24%, which surpasses the performance of previously reported for the formamidinium (FA) based system, indicating the potential of WS2 for PeLEDs.

AB - Due to the deep energy levels, the external quantum efficiency (EQE) of the blue perovskite light-emitting diode (PeLED) is far lower than its green, red, and near-infrared counterparts, which has exceeded 20%. The mismatched energy levels between perovskites and the hole transporting layer (HTL) still hinder the hole injection and consequent improvement of blue PeLED device performance. Here, a two-dimensional material, WS2 (Tungsten disulfide), was introduced to match the energy levels between perovskites and HTL and enhanced the hole injection. The WS2 HTL-based perovskite FAPbBr3-xClx blue LED achieved a luminance of 990 cd/m2 with an EQE of 3.24%, which surpasses the performance of previously reported for the formamidinium (FA) based system, indicating the potential of WS2 for PeLEDs.

KW - Blue light-emitting diodes

KW - Energy matching

KW - Hole transport layer

KW - Perovskite

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