Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China.
College of Energy, Soochow Institute for Energy and Materials Innovations, Soochow University, Suzhou, 215006, China.
Angew Chem Int Ed Engl. 2023 May 15;62(21):e202219255. doi: 10.1002/anie.202219255. Epub 2023 Apr 13.
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.
实现高效的蓝色电致发光（EL）仍然是阻碍钙钛矿发光二极管（PeLED）走向商业应用的基本挑战。造成低效蓝色 PeLED 的瓶颈主要归因于基于混合卤化物工程或降低维度策略的不良发射蓝色钙钛矿发射器。在此，我们报告了高性能的天蓝色 PeLED（490nm），通过掺入分子修饰剂，即 4,4'-二氟苯乙酮，最大 EQE 超过 15%，可显著抑制非辐射复合并调整准二维蓝色钙钛矿的低维相分布，这为开发新一代蓝色光源提供了一个显著的范例。
