Multifunctional Interfacial Molecular Bridge for Highly Efficient and Mechanically Robust Flexible Blue Perovskite Light‐Emitting Diodes
Abstract
ABSTRACT Metal halide perovskites have emerged as promising candidates for flexible optoelectronics, yet the development of efficient blue‐emitting devices remains hindered by low charge utilization and poor mechanical durability. Herein, we propose a multifunctional molecular bridging strategy using trifluoroacetate (TFA − )‐based molecule to construct efficient and mechanically robust flexible blue perovskite light‐emitting diodes (PeLEDs). The TFA − bridge enhances interfacial adhesion and creates a stress‐redistributing network at the interface, effectively dissipating bending‐induced strain. Concurrently, this molecular bridge effectively modulates the crystallization of low‐dimensional perovskites through competitive coordination and hydrogen bond‐guided phase reorganization, facilitating efficient exciton confinement and energy transfer. The resulting flexible blue PeLEDs achieve an external quantum efficiency of 20.05% and outstanding bending durability, maintaining over 90% of their initial performance after 2000 cycles at a 5 mm radius. This work demonstrates the dual role of biomimetic molecular bridges in simultaneously stabilizing the bulk perovskite phase and the device interface, providing a generalizable route toward high‐performance and mechanically robust flexible optoelectronics.
Article Details
Authors (11)
Yi Yu
Yang Shen
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics
Yu‐Tong Wang
School of Physics East China Normal University Shanghai China
Bing‐Feng Wang
School of Physics and Electronic Science East China Normal University Shanghai 200062 China
Yu‐Hang Zhang
State Key Laboratory For Physical Chemistry of Solid Surfaces Innovation Laboratory for Sciences and Technologies of Energy Material of Fujian Province (IKKEM) Collaborative Innovation Center of Chemistry for Energy Materials (<i>i</i>ChEM) Engineering Research Center of Electrochemical Technologies of Ministry of Education, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University Xiamen Fujian China
Long‐Xue Cao
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Soochow University Suzhou 215123 China
Shi‐Chi Feng
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Soochow University Suzhou 215123 China
Zhen‐Huang Su
Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory Chinese Academy of Sciences Shanghai 200241 China
Xingyu Gao
Yan‐Qing Li
School of Physics East China Normal University Shanghai P. R. China
Jian‐Xin Tang
Jiangsu Key Laboratory For Carbon‐Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu P. R. China