题目：

Optimization on Low-Dimensional Components of Quasi-2D Perovskite Films for Deep Blue Light-Emitting Diodes

作者：

Shuai Yuan¹, Zhao-Kui Wang¹*, Lei-Xin Xiao², Chun-Feng Zhang², Sheng-Yi Yang¹, Bing-Bing Chen³, Hui-Ting Ge¹,Qi-Sheng Tian¹, Yan Jin¹, Liang-Sheng Liao¹*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nanoscience and Technology, Soochow University, 199 Ren-Ai Road, Suzhou 215123, China.

² National Laboratory of Solid State Microstructures，School of Physics and Collaborative Innovation Center of Advanced Microstructures Nanjing University, Nanjing, Jiangsu 210093,   China

³Department of Energy Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu   210009, China

摘要：

Compared to efficient green and near-infrared light-emitting diodes (LEDs), less progress has   been made on deep-blue perovskite LEDs. They suffer from inefficient domain [various number of PbX₆^- layers (n)] control, resulting in a series of unfavorableissues such as unstable color, multi-peak profile and poor fluorescence yield. Here, we report a strategy involving a delicate spacer modulation for 2D perovskite films via an introduction of aromatic polyamine molecules into the perovskite precursor. With low-dimensional components engineering, the n₁ domain, which shows non-radiative recombination and retarded exciton transfer, is significantly suppressed. Also, the n₃ domain, which representsthe population of emission species, is remarkably increased. The optimized quasi-2D perovskite film presentsblue emission from n₃ domain (peak at 465 nm) with aphotoluminescence quantum yield (PLQY) as high as 77 %. It enables the corresponding perovskite LEDs to deliver stable deep blue emission (CIE (0.145, 0.05)) with an external quantum efficiency (EQE) of 2.6 %. The findings in this work provide further understanding on the structural and emission properties of quasi-2D perovskites, which pave a new route to design deep-blue emissive perovskite materials.

影响因子：

21.95

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201904319

责任编辑：朱文昌