Constructing Multi-Functional Polymeric-Termination Surface Enables High-Performance Flexible Perovskite LEDs

Liu, Chunyu1,2; Zhang, Dezhong1; Sun, Jiayun1,3; Li, Dongyu1; Xiong, Qi1; Lyu, Benzheng1; Guo, Wenbin2; Choy, Wallace C. H.1

2024-05-01

10.1002/adfm.202404791

ADVANCED FUNCTIONAL MATERIALS   影响因子和分区

1616-301X

1616-3028

["Flexible perovskite light-emitting diodes (f-PeLEDs) have attracted increasing interest to realize true-color, low-cost, and light-weight wearable optoelectronic and flexible display applications. However, their external quantum efficiency (EQE) and mechanical stability lag far behind because of the inherent surface and brittle issues of polycrystalline perovskite films. In this work, a multi-functional polymeric-termination surface of perovskite film is constructed for achieving efficient and mechanically stable f-PeLEDs. It takes the roles to not only reduce defects through equipping coordination groups to improve emission properties, but also optimize film morphology and eliminate pinholes to solve the long-standing issue of leakage current. Meanwhile, the polymeric-termination surface with anchoring points and polymeric soft chains on perovskites demonstrates synergetic effects beyond the corresponding functional group-only or polymer-only strategies in reducing the Young's modulus and improving the mechanical flexibility. Ultimately, the record EQE of 22.1% and significantly enhanced mechanical stability of maintaining 82% of the initial performance after 2000 bending cycles with radius of 5 mm are achieved in pure-green f-PeLEDs. The work paves the way for the development of high-performance flexible optoelectronic devices.","A multi-functional polymeric-termination surface is constructed on the perovskite films to achieve highly efficient and mechanically stable flexible perovskite light-emitting diodes. The polymeric-termination surface with functional groups and polymer synergetic effects can improve the optical, electrical, and mechanical properties of perovskite films simultaneously. A record efficiency and obviously improved flexible stability of devices are achieved. image"]

flexible functional group polymer pure primary color surface

SCI ; EI

英语

其他

University Grant Council["202011159254","202111159113","17211220","17200021","17200823"] ; Research Grants Council (RGC)[ITS/277121FP]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001230596200001

WILEY-V C H VERLAG GMBH

MATERIALS SCIENCE

Web of Science

1.Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong 000000, Peoples R China
2.Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Liu, Chunyu,Zhang, Dezhong,Sun, Jiayun,et al. Constructing Multi-Functional Polymeric-Termination Surface Enables High-Performance Flexible Perovskite LEDs[J]. ADVANCED FUNCTIONAL MATERIALS,2024.

Liu, Chunyu.,Zhang, Dezhong.,Sun, Jiayun.,Li, Dongyu.,Xiong, Qi.,...&Choy, Wallace C. H..(2024).Constructing Multi-Functional Polymeric-Termination Surface Enables High-Performance Flexible Perovskite LEDs.ADVANCED FUNCTIONAL MATERIALS.

Liu, Chunyu,et al."Constructing Multi-Functional Polymeric-Termination Surface Enables High-Performance Flexible Perovskite LEDs".ADVANCED FUNCTIONAL MATERIALS (2024).