作者：

Nan Li¹, Yu Xia¹, Xiao-Ying He¹, Jia-Cheng Li¹, Kai-Li Wang¹, Jing Chen¹, Chun-Hao Chen¹, Lei Huang¹, Yu-Tong Yang¹, Xin Chen¹, Yan-Hui Lou², and Zhao-Kui Wang¹*

单位：

¹State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China.

²Soochow Institute for Energy and Materials Innovations, College of Energy, Soochow University, Suzhou 215006, China.

摘要：

The operational stability of mixed-halide blue perovskite light-emitting diodes (PeLEDs) is fundamentally constrained by intrinsic halide ion migration. Employing single-halide perovskite systems represents a viable route to circumvent this issue, yet solution-processed pure-bromide perovskites typically exhibit undesirable green emission, impeding attainment of high-color-purity blue electroluminescence. Herein, this challenge is addressed through the strategic incorporation of Mg²⁺ into the B-site of the pure bromine-based perovskite lattice. This substitution induces a substantial spectral blueshift and promotes phase homogenization by facilitating efficient energy transfer from small-n to large-n phases. Notably, the first systematic investigation and mechanistic elucidation of the origin of bimodal emission in blue PeLEDs is presented. Consequently, the champion PeLED delivers stable deep-blue emission at 464 nm with a maximum external quantum efficiency of 4.76%. This study presents a definitive paradigm for achieving spectrally stable and efficient deep-blue emission from single-halide perovskites. The elucidated mechanism underlying emission bimodality provides critical guidance for future development of blue PeLEDs.

影响因子：

27.4

分区情况：

一区

链接：

https://doi.org/10.1002/adma.202517517