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- Title
Multifunctional Crystal Regulation Enables Efficient and Stable Sky‐Blue Perovskite Light‐Emitting Diodes.
- Authors
Shen, Yang; Li, Yan‐Qing; Zhang, Kai; Zhang, Liu‐Jiang; Xie, Feng‐Ming; Chen, Li; Cai, Xiao‐Yi; Lu, Yu; Ren, Hao; Gao, Xingyu; Xie, Haijiao; Mao, Hongying; Kera, Satoshi; Tang, Jian‐Xin
- Abstract
Perovskite light‐emitting didoes (PeLEDs) have shown considerable potential in solution‐processable display applications. However, the performance of blue PeLEDs in terms of efficiency and stability hinders their practicality on account of severe trap‐mediated nonradiative recombination losses and halide phase segregation. To ameliorate these issues, mixed‐halide sky‐blue perovskite materials are strategically modulated through crystal defect passivation with a trifurcate isocyanate oligomer, which leads to the synergistical suppression of charge trap density and halide ion migration. The proposed approach enables the performance improvement for sky‐blue PeLEDs, exhibiting a peak external quantum efficiency of 14.82% and spectrally stable emission at 487 nm. In addition, prolonged operational lifetime and enhanced capability of moisture resistance are achieved simultaneously, approaching a half‐lifetime of ≈2900 s at an initial brightness of 178 cd m–2.
- Subjects
LIGHT emitting diodes; PEROVSKITE; CRYSTAL defects; QUANTUM efficiency; ION migration &; velocity; CRYSTALS
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 41, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202206574