题目：Stable and Efficient Pure-Red Perovskite Light-Emitting Diodes


作者：Zhiyong Zheng1, Zhenwei Ren1,*, Xin Zhou1, Chengzhao Luo1, Hua Chen1, Chenglong Wu1, Bin Hu1, and Yu Chen1,2, *


单位：

1 School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China;

2 Dushu Lake Science and Education Innovation District, National University of Singapore Suzhou Research Institute, Suzhou 215123, China;


Abstract: The bromine/iodine mixed halide perovskites have been extensively employed for pure-red emission. However, the issues of compositional heterogeneity and halide ion migration result in impure emission and compromised stability and efficiency for the perovskite light-emitting diodes (PeLEDs). Herein, a novel approach is proposed by incorporating multi-functional graphene quantum dots (GQDs) into the perovskites to address these critical problems. The new principles of composition reconstruction, perovskite phase isolation, and halide ion immobilization are revealed to address the unique and synergistic role of GQDs in achieving homogeneous perovskite films and suppressing halide ion migration, and clarify the formation of strong coordination and hydrogen bonding interaction between GQDs and the perovskites. As a result, high-performance pure-red PeLEDs that showcase a fantastic efficiency of 27.9% with a narrow emission at 640 nm and a remarkable lifetime of 110.3 h with consistently stable EL spectra during tests, representing one of the best-performing pure-red PeLEDs, are demonstrated. This strategy contributes an effective approach to solve the critical concerns in mixed-halide perovskites for stable and efficient pure-red PeLEDs for the community.


摘要：溴/碘混合卤化物钙钛矿已被广泛应用于纯红光发光领域。然而，组分不均匀性与卤素离子迁移问题致使钙钛矿发光二极管（PeLEDs）色纯度差、稳定性及效率欠佳。本文将多功能石墨烯量子点（GQDs）引入钙钛矿体系，创新性地提出了组分重构、钙钛矿相隔离及卤素锚定协同作用制备均匀钙钛矿薄膜，抑制离子迁移获得高性能纯红光钙钛矿发光二极管的新方法。报道的纯红光PeLEDs外量子效率高达27.9%，在640 nm波长处展现出超窄发射峰，且发光光谱稳定，寿命长达110.3 h，器件性能指标处于国际领先水平。该工作为利用混合卤化物钙钛矿制备稳定高效纯红光器件提供有效途径，对该领域发展具有重要推动作用。




影响因子：26.8

链接：https://doi.org/10.1002/adma.202515053