期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202302184
关键词
Blue Emitting; Halide Migration; Mixed-Halide Perovskite; Perovskite Light-Emitting Diodes; Perovskites
Scientists have demonstrated that manipulating the degree of local lattice distortion can suppress halide migration in mixed-halide perovskites, leading to the achievement of efficient and stable blue perovskite light-emitting diodes (PeLEDs).
Mixed-halide perovskites are considered the most straightforward candidate to realize blue perovskite light-emitting diodes (PeLEDs). However, they suffer severe halide migration, leading to spectral instability, which is particularly exaggerated in high chloride alloying perovskites. Here, we demonstrate energy barrier of halide migration can be tuned by manipulating the degree of local lattice distortion (LLD). Enlarging the LLD degree to a suitable level can increase the halide migration energy barrier. We herein report an A-site cation engineering to tune the LLD degree to an optimal level. DFT simulation and experimental data confirm that LLD manipulation suppresses the halide migration in perovskites. Conclusively, mixed-halide blue PeLEDs with a champion EQE of 14.2 % at 475 nm have been achieved. Moreover, the devices exhibit excellent operational spectral stability (T-50 of 72 min), representing one of the most efficient and stable pure-blue PeLEDs reported yet.
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