Red Perovskite Light-Emitting Diodes with Efficiency Exceeding 25% Realized by Co-Spacer Cations

Ji Jiang^{1

2}, Zema Chu^{1

2}, Zhigang Yin^{1

2}, Jingzhen Li^{1

2}, Yingguo Yang³, Jingren Chen^{1

2}, Jinliang Wu^{1

2}, Jingbi You^{1

2}, Xingwang Zhang^{1

2

4}

Affiliations

¹ Key Lab of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, P. R. China.
⁴ Joint Lab of Digital Optical Chip, Wuyi University, Jiangmen, 529020, P. R. China.

PMID: 35855612
DOI: 10.1002/adma.202204460

Red Perovskite Light-Emitting Diodes with Efficiency Exceeding 25% Realized by Co-Spacer Cations

Ji Jiang et al. Adv Mater. 2022 Sep.

. 2022 Sep;34(36):e2204460.

doi: 10.1002/adma.202204460. Epub 2022 Aug 8.

Authors

Ji Jiang^{1

2}, Zema Chu^{1

2}, Zhigang Yin^{1

2}, Jingzhen Li^{1

2}, Yingguo Yang³, Jingren Chen^{1

2}, Jinliang Wu^{1

2}, Jingbi You^{1

2}, Xingwang Zhang^{1

2

4}

Affiliations

¹ Key Lab of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, P. R. China.
⁴ Joint Lab of Digital Optical Chip, Wuyi University, Jiangmen, 529020, P. R. China.

PMID: 35855612
DOI: 10.1002/adma.202204460

Abstract

Perovskite light-emitting diodes (PeLEDs) have received great attention in recent years due to their narrow emission bandwidth and tunable emission spectrum. Efficient red emission is one of most important parts for lighting and displays. Quasi-2D perovskites can deliver high emission efficiency due to the strong carrier confinement, while the external quantum efficiencies (EQE) of red quasi-2D PeLEDs are inefficient at present, which is due to the complex distribution of different n-value phases in quasi-2D perovskite films. In this work, the phase distribution of the quasi-2D perovskite is finely controlled by mixing two different large organic cations, which effectively reduces the amount of smaller n-index phases, meanwhile the passivation of lead and halide defects in perovskite films is realized. Accordingly, the PeLEDs show 25.8% EQE and 1300 cd m^-2 maximum brightness at 680 nm, which exhibits the highest performance for red PeLEDs up to now.

Keywords: co-spacer cations; electroluminescence; light-emitting diodes; quasi-2D perovskites.

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Red Perovskite Light-Emitting Diodes with Efficiency Exceeding 25% Realized by Co-Spacer Cations

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Red Perovskite Light-Emitting Diodes with Efficiency Exceeding 25% Realized by Co-Spacer Cations

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