Shen Piaoyang, Ding Shuo, Tang Zhaobing, Qian Lei, Zhang Ting, Xiao Peng, Chen Tao, Chen Hao, Zhang Xinyu, Ren Yong, Zhao Dewei, Xiang Chaoyu
Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Qianwan Institute of CNITECH, Ningbo, Zhejiang, 315336, China.
College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Sichuan University, Chengdu, Sichuan, 610065, China.
Adv Sci (Weinh). 2024 Sep;11(34):e2306167. doi: 10.1002/advs.202306167. Epub 2024 Jul 11.
Quasi-2D perovskites light-emitting diodes (PeLEDs) have achieved significant progress due to their superior optical and electronic properties. However, the blue PeLEDs still exist inefficient energy transfer and electroluminescence performance caused by mixed multidimensional phase distribution. In this work, transition metal salt (zinc bromide, ZnBr) is introduced to modulate phase distributions by suppressing the nucleation of high n phase perovskites, which effectively shortens the energy transfer path for blue emission. Moreover, ZnBr also facilitates energy level matching and reduces non-radiative recombination, thus improving electroluminescence (EL) efficiency. Benefiting from these combined improvements, an efficient blue PeLEDs is obtained with a maximum external quantum efficiency (EQE) of 16.2% peaking located at 486 nm. This work provides a promising approach to tune phase distribution of quasi-2D perovskites and achieving highly efficient blue PeLEDs.
准二维钙钛矿发光二极管（PeLEDs）因其优异的光学和电子性能而取得了显著进展。然而，由于混合多维相分布导致的能量转移效率低下和电致发光性能问题，蓝色PeLEDs仍然存在。在这项工作中，引入过渡金属盐（溴化锌，ZnBr）通过抑制高n相钙钛矿的成核来调节相分布，这有效地缩短了蓝色发射的能量转移路径。此外，ZnBr还促进了能级匹配并减少了非辐射复合，从而提高了电致发光（EL）效率。受益于这些综合改进，获得了一种高效的蓝色PeLEDs，其最大外量子效率（EQE）为16.2%，峰值位于486nm。这项工作为调节准二维钙钛矿的相分布和实现高效蓝色PeLEDs提供了一种有前景的方法。
