Adv. Funct. Mater.: Manipulating Ionic Behavior with Bifunctional Additives for Efficient Sky-Blue Perovskite Light-Emitting Diodes

Title：

Manipulating Ionic Behavior with Bifunctional Additives for Efficient Sky-Blue Perovskite Light-Emitting Diodes

Authors：

Wei Zhou¹, Yang Shen¹*, Long-Xue Cao¹, Yu Lu¹, Ying-Yi Tang², Kai Zhang³, Hao Ren¹, Feng-Ming Xie¹, Yan-Qing Li²*,Jian-Xin Tang^1,3*

Institutions：

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

²School of Physics and Electronic Science, Ministry of Education Nanophotonics & Advanced Instrument Engineering Research Center, East China Normal University Shanghai 200062, P. R. China

³Macau Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials Zhuhai MUST Science and Technology Research Institute Macau University of Science and Technology Taipa, Macau 999078, P. R. China

Abstract：

Perovskite Light-emitting diodes (PeLEDs) have emerged as a promising technique for future high-definition displays due to their outstanding electroluminescent characters. However, the development of blue PeLEDs toward practical applications is seriously hindered by their inferior performance, which mainly arises from the detrimental halide ionic behavior and thus severe nonradiative recombination in mixed-halide blue perovskite materials. Herein, efficient sky-blue PeLEDs featuring spectrally stable emission at 483 nm are realized by employing bifunctional passivators of Lewis-base benzoic acid anions and alkali metal cations to simultaneously passivate the under-coordinated lead atoms and suppress halide ion migration. A decent external quantum efficiency (EQE) of 16.58% and a maximum EQE of 18.65% are achieved, which is further boosted to 28.82% through the optical outcoupling enhancement. This work demonstrates unique insight into the generality and individuality of this category of benzoates and puts forward a feasible guidance in choosing appropriate additives for efficient perovskite materials.

IF：

19.924

Link：

https://doi.org/10.1002/adfm.202301425