Highly efficient quasi-two dimensional perovskite light-emitting diodes by phase tuning

• Published in: Organic electronics Vol. 98; p. 106295
• Main Authors: Xu, Qiang, Wang, Run, Jia, Ya-Lan, He, Xiao-Li, Deng, Yan-Hong, Yu, Fu-Xing, Zhang, Yue, Ma, Xing-Juan, Chen, Ping, Zhang, Yong, Xiong, Zu-Hong, Gao, Chun-Hong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2021
• Subjects: Additive-based antisolvent; Light-emitting diodes; Phase tuning; Pinhole-free; Tetraphenylphosphonium chloride; Phase tuning; Additive-based antisolvent; Light-emitting diodes; Tetraphenylphosphonium chloride; Pinhole-free
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2021.106295

Tetraphenylphosphonium chloride (TPPCl) is used as an additive in the antisolvent for preparing the quasi-two Dimensional (quasi-2D) perovskite film. This strategy is not only beneficial for the morphology formation but also the phase tuning of the quasi-2D perovskite film. Highly efficient and stable perovskite light-emitting diodes (PeLEDs) were achieved with the maximum luminance of 35,000 cd/m2, the maximum current efficiency of 48.0 cd/A and the maximum external quantum efficiency (EQE) of 12.42%. Due to the reduced exciton quenching rate, improved charge carrier injection and transport ability, the electroluminescent performance of the TPPCl-based PeLEDs has been enhanced. [Display omitted] •An additive-based antisolvent method for preparing perovskite film.•The crystallizing phase transition from small-n to large-n is verified.•Energy funneling is enhanced.•The defect state and exciton quenching rate are reduced.•Outstanding EL efficiencies are achieved.