Angew. Chem. Int. Ed.: Low-Dimensional Phase Regulation to Restrain Non-Radiative Recombination for Sky-Blue Perovskite LEDs with EQE Exceeding 15%

Title：

Low-Dimensional Phase Regulation to Restrain Non-Radiative Recombination for Sky-Blue Perovskite LEDs with EQE Exceeding 15%

Authors：

Bin Wang¹, Yu-Hang Zhou¹, Shuai Yuan¹*, Yan-Hui Lou², Kai-Li Wang¹, Yu Xia¹, Chun-Hao Chen¹, Jing Chen¹, Yi-Ran Shi¹, Zhao-Kui Wang¹*, and Liang-Sheng Liao¹ 

Institutions：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China.

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

Abstract：

Achieving efficient blue electroluminescence (EL) remains the fundamental challenge that impedes perovskite light-emitting diodes (PeLEDs) towards commercial applications. The bottleneck accounting for the inefficient blue PeLEDs is broadly attributed to the poor-emissive blue perovskite emitters based on either mixed halide engineering or reduced-dimensional strategy. Herein, we report the high-performing sky-blue PeLEDs (490 nm) with the maximum EQE exceeding 15% by incorporating a molecular modifier, namely 4,4'-Difluorophenone, for significantly suppressing the non-radiative recombination and tuning of the low-dimensional phase distribution of quasi-2D blue perovskites, which represents a remarkable paradigm for developing the new generation of blue lighting sources.

IF：

16.823

Link：

https://doi.org/10.1002/anie.202219255