Ultrapure and efficient electroluminescence in alkali metal doped inorganic perovskite quantum wires arrays

Yang Bryan Cao; Yu Fu; Yu Zhou; Xiao Qiu; Daquan Zhang; Yucheng Ding; Ying Xie; Beitao Ren; Qingsong Shan; Pok Fung Chan; Wenying Tang; Feng Xue; Xiaofei Sun; Kemeng Zhou; Jin-Feng Liao; Zijin Jin; Qianpeng Zhang; Jiannong Wang; Dai-Bin Kuang; Xinhui Lu; Yuanjing Lin; Haibo Zeng; Zhiyong Fan

doi:10.1038/s41467-025-61085-6

Ultrapure and efficient electroluminescence in alkali metal doped inorganic perovskite quantum wires arrays

Nat Commun. 2025 Jul 1;16(1):6053. doi: 10.1038/s41467-025-61085-6.

Authors

Yang Bryan Cao^#^{1

2}, Yu Fu^#³, Yu Zhou^#^{1

2}, Xiao Qiu^{1

2}, Daquan Zhang^{1

2}, Yucheng Ding^{1

2}, Ying Xie⁴, Beitao Ren^{1

2}, Qingsong Shan⁵, Pok Fung Chan⁶, Wenying Tang^{1

2}, Feng Xue^{1

2}, Xiaofei Sun^{1

2}, Kemeng Zhou^{7

8}, Jin-Feng Liao⁹, Zijin Jin¹⁰, Qianpeng Zhang^{1

2}, Jiannong Wang¹⁰, Dai-Bin Kuang⁹, Xinhui Lu⁶, Yuanjing Lin^{7

8}, Haibo Zeng¹¹, Zhiyong Fan^{12

13

14}

Affiliations

¹ Department of Electronic & Computer Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR, China.
² State Key Laboratory of Advanced Display and Optoelectronics Technologies HKUST, Kowloon, Hong Kong SAR, China.
³ School of Advanced Energy, Sun Yat-Sen University, Shenzhen, Guangdong, China.
⁴ School of Chemistry and Materials Science, Heilongjiang University, Harbin, Heilongjiang, China.
⁵ MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.
⁶ Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, China.
⁷ School of Microelectronics, Southern University of Science and Technology, Shenzhen, China.
⁸ State Key Laboratory of Quantum Functional Materials, Southern University of Science and Technology, Shenzhen, China.
⁹ MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, China.
¹⁰ Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR, China.
¹¹ MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China. zeng.haibo@njust.edu.cn.
¹² Department of Electronic & Computer Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR, China. eezfan@ust.hk.
¹³ State Key Laboratory of Advanced Display and Optoelectronics Technologies HKUST, Kowloon, Hong Kong SAR, China. eezfan@ust.hk.
¹⁴ Department of Chemical and Biological Engineering, HKUST, Kowloon, Hong Kong SAR, China. eezfan@ust.hk.

^# Contributed equally.

Abstract

Alkali metal doping has been widely utilized to regulate metal halide perovskites and improve their luminescence performance. However, due to the discordant tolerance factor caused by the smaller size of potassium and rubidium ions, it is still debatable whether they can be incorporated in the cesium perovskite crystal lattice. Here we provide unambiguous evidence for the formation of Rb⁺ and K⁺ substitutionally doped stable perovskite cubic crystal structure in the form of quantum wires embedded in nanoporous alumina template. The suppressed inner defects and enhanced exciton binding energy lead to a reduced non-radiative recombination in the co-doped perovskite quantum wires. The perovskite light-emitting diodes with a maximum external quantum efficiency of 17.5%, 21.2%, 24.9% and 30.1% and a maximum luminance of 1638 cd m^-2, 3365 cd m^-2, 13,483 cd m^-2 and 31,706 cd m^-2 for electroluminescence peak of 476 nm (primary-blue), 483 nm (sky-blue), 490 nm (sky-blue) and 512 nm (green) are fabricated respectively. Surprisingly, all devices emit high-color purity light with narrow linewidth of ≤16 nm.