High-performance large-area quasi-2D perovskite light-emitting diodes

Changjiu Sun, Yuanzhi Jiang, Minghuan Cui, Lu Qiao, Junli Wei, Yanmin Huang, Li Zhang, Tingwei He, Saisai Li, Hsien-Yi Hsu, Chaochao Qin, Run Long and Mingjian Yuan ()
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Changjiu Sun: Nankai University
Yuanzhi Jiang: Nankai University
Minghuan Cui: Henan Normal University
Lu Qiao: Beijing Normal University
Junli Wei: Nankai University
Yanmin Huang: Nankai University
Li Zhang: Nankai University
Tingwei He: Nankai University
Saisai Li: Nankai University
Hsien-Yi Hsu: City University of Hong Kong
Chaochao Qin: Henan Normal University
Run Long: Beijing Normal University
Mingjian Yuan: Nankai University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Serious performance decline arose for perovskite light-emitting diodes (PeLEDs) once the active area was enlarged. Here we investigate the failure mechanism of the widespread active film fabrication method; and ascribe severe phase-segregation to be the reason. We thereby introduce L-Norvaline to construct a COO−-coordinated intermediate phase with low formation enthalpy. The new intermediate phase changes the crystallization pathway, thereby suppressing the phase-segregation. Accordingly, high-quality large-area quasi-2D films with desirable properties are obtained. Based on this, we further rationally adjusted films’ recombination kinetics. We reported a series of highly-efficient green quasi-2D PeLEDs with active areas of 9.0 cm2. The peak EQE of 16.4% is achieved in = 3, represent the most efficient large-area PeLEDs yet. Meanwhile, high brightness device with luminance up to 9.1 × 104 cd m−2 has achieved in = 10 film.

Date: 2021
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DOI: 10.1038/s41467-021-22529-x

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