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Research Article

Highly spectra-stable pure blue perovskite light-emitting diodes based on copper and potassium co-doped quantum dots

Fang Chen1,2,3, Wenjie Ming5, Yongfei Li6, Yun Gao1,2, Lea Pasquale7, Kexin Yao6, Boyuan Huang5, Qiuting Cai1,2, Guochao Lu1,2, Jizhong Song8, Mirko Prato7, Xingliang Dai1,2,3,4( ), Haiping He1,2,3,4( ), Zhizhen Ye1,2,3,4( )
School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China
Wenzhou XINXINTAIJING Tech. Co. Ltd., Wenzhou 325006, China
Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan 030000, China
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Multi-scale Porous Materials Center, Institute of Advanced Interdisciplinary Studies & School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
Materials Characterization Facility, Istituto Italiano di Tecnologia, Genova 16163, Italy
School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
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Graphical Abstract

This work adopts single-layer perovskite quantum dots (QDs) to tackle the electroluminescence (EL) spectra shift in pure-blue perovskite light-emitting diodes (LEDs) and improve the LED efficiency by co-doping copper and potassium in the mixed-halide perovskite QDs.

Abstract

Halide perovskite light emitting diodes (LEDs) have gained great progress in recent years. However, mixed-halide perovskites for blue LEDs usually suffer from electroluminescence (EL) spectra shift at a high applied voltage or current density, limiting their efficiency. In this work, we report a strategy of using single-layer perovskite quantum dots (QDs) film to tackle the electroluminescence spectra shift in pure-blue perovskite LEDs and improve the LED efficiency by co-doping copper and potassium in the mixed-halide perovskite QDs. As a result, we obtained pure-blue halide perovskite QD-LEDs with stable EL spectra centred at 469 nm even at a current density of 1,617 mA·cm−2. The optimal device presents a maximum external quantum efficiency (EQE) of 2.0%. The average maximum EQE and luminance of the LEDs are 1.49% and 393 cd·m−2, increasing 62% and 66% compared with the control LEDs. Our study provides an effective strategy for achieving spectra-stable and highly efficient pure-blue perovskite LEDs.

Keywords

light-emitting diodeblue LEDperovskite quantum dotstable electroluminescence spectrametal doping

Electronic Supplementary Material

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 7654-7660
DOI: 10.1007/s12274-023-5452-1
Cite this article:
Chen F, Ming W, Li Y, et al. Highly spectra-stable pure blue perovskite light-emitting diodes based on copper and potassium co-doped quantum dots. Nano Research, 2023, 16(5): 7654-7660. https://doi.org/10.1007/s12274-023-5452-1
Topics:
Light emitting diodes Semiconductor quantum dots

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Received: 09 November 2022
Revised: 20 December 2022
Accepted: 25 December 2022
Published: 13 April 2023
© Tsinghua University Press 2023
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