Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices

Gao-Da Ye; Ran Ding; Su-Heng Li; Lei Ni; Shu-Ting Dai; Nian-Ke Chen; Yue-Feng Liu; Runda Guo; Lei Wang; Xian-Bin Li; Bin Xu; Jing Feng

doi:10.1038/s41377-024-01484-4

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Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices

Original Articles

- Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices
- Light: Science & Applications Vol. 13, Issue 7, Pages: 1341-1353(2024)
- Affiliations：
  
  1.State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, 130012 Changchun, China
  2.State Key Laboratory of Supermolecular Structures and Materials, The Institute of Theoretical Chemistry, Jilin University, 2699 Qianjin Street, 130012 Changchun, China
  3.Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 430074 Wuhan, China
- Author bio：
  
  Ran Ding (dingran@jlu.edu.cn)
  Jing Feng (jingfeng@jlu.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01484-4
  CLC：
- Published：31 July 2024，
  
  Published Online：07 June 2024，
  
  Received：20 December 2023，
  
  Revised：11 May 2024，
  
  Accepted：14 May 2024
- Accepted：
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Ye, G. D. et al. Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices. Light: Science & Applications, 13, 1341-1353 (2024).
DOI：

Ye, G. D. et al. Single-crystalline hole-transporting layers for efficient and stable organic light-emitting devices. Light: Science & Applications, 13, 1341-1353 (2024). DOI： 10.1038/s41377-024-01484-4.

摘要

Abstract

Efficient charge-carrier injection and transport in organic light-emitting devices (OLEDs) are essential to simultaneously achieving their high efficiency and long-term stability. However

the charge-transporting layers (CTLs) deposited by various vapor or solution processes are usually in amorphous forms

and their low charge-carrier mobilities

defect-induced high trap densities and inhomogeneous thickness with rough surface morphologies have been obstacles towards high-performance devices. Here

organic single-crystalline (SC) films were employed as the hole-transporting layers (HTLs) instead of the conventional amorphous films to fabricate highly efficient and stable OLEDs. The high-mobility and ultrasmooth morphology of the SC-HTLs facilitate superior interfacial characteristics of both HTL/electrode and HTL/emissive layer interfaces

resulting in a high Haacke's figure of merit (FoM) of the ultrathin top electrode and low series-resistance joule-heat loss ratio of the SC-OLEDs. Moreover

the thick and compact SC-HTL can function as a barrier layer against moisture and oxygen permeation. As a result

the SC-OLEDs show much improved efficiency and stability compared to the OLEDs based on amorphous or polycrystalline HTLs

suggesting a new strategy to developing advanced OLEDs with high efficiency and high stability.

关键词

Keywords

references

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