High-efficiency flexible OLED devices with PEDOT: PSS/HAT-CN double hole injection layer

Zi-yu ZHAO; Fang-hui ZHANG; Hui ZHAO; Zhi-chao LIN; Zhen XUE; Lei DING

doi:10.3788/YJYXS20203502.0099

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High-efficiency flexible OLED devices with PEDOT: PSS/HAT-CN double hole injection layer

Materials and Devices | 更新时间：2020-07-16

- High-efficiency flexible OLED devices with PEDOT: PSS/HAT-CN double hole injection layer
- Chinese Journal of Liquid Crystals and Displays Vol. 35, Issue 2, Pages: 99-107(2020)
- 作者机构：
  
  1.陕西科技大学材料科学与工程学院, 陕西西安 710021
  2.陕西莱特光电材料股份有限公司, 陕西西安 710000
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20203502.0099
  CLC： TN383.1
- Received：13 July 2019，
  
  Revised：10 October 2019，
  
  Accepted：10 October 2019，
  
  Published：05 February 2020
- 稿件说明：
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Zi-yu ZHAO, Fang-hui ZHANG, Hui ZHAO, et al. High-efficiency flexible OLED devices with PEDOT: PSS/HAT-CN double hole injection layer[J]. Chinese journal of liquid crystals and displays, 2020, 35(2): 99-107.
DOI：

Zi-yu ZHAO, Fang-hui ZHANG, Hui ZHAO, et al. High-efficiency flexible OLED devices with PEDOT: PSS/HAT-CN double hole injection layer[J]. Chinese journal of liquid crystals and displays, 2020, 35(2): 99-107. DOI： 10.3788/YJYXS20203502.0099.

摘要

为了研究不同的空穴注入层修饰柔性衬底对柔性OLED器件性能的影响，本文采用HAT-CN、PEDOT：PSS、PEDOT：PSS/HAT-CN 3种空穴注入层制备柔性OLED器件。设计的器件结构为PET/ITO/HIL/TAPC（60 nm）/CBP：Ir（ppy）

（20 nm，10%）/TmPyPB（45 nm）/Liq（2 nm）/Al（100 nm）。采用旋涂的方法制备了PEDOT：PSS，其余有机层及阴极采用真空蒸镀法制备。结果表明，采用PEDOT：PSS/HAT-CN复合薄膜作为空穴注入层的柔性OLED器件性能最优。该器件的最大电流效率和最大功率效率分别为84 cd/A和76 lm/W。研究表明，经PEDOT：PSS修饰的柔性衬底表面更为连续及平滑，不容易使器件发生漏电及短路现象；同时PET/ITO/PEDOT：PSS/HAT-CN复合薄膜在绿光波段有较高的透过率，可以提高器件的出光率；另外该双空穴注入结构使器件内部载流子的注入处于动态平衡状态，增加了电子和空穴载流子的复合概率。

Abstract

In order to study the effect of different hole injection layers on the performance of flexible OLED devices

HAT-CN

PEDOT:PSS and PEDOT:PSS/HAT-CN were used to prepare flexible OLED devices and measure their performance parameters. The device structure is PET/ITO/HIL/TAPC (60 nm)/CBP:Ir(ppy)

(20 nm

10%)/TmPyPB (45 nm)/Liq (2 nm)/Al (100 nm). PEDOT:PSS was prepared by spin coating

and the other organic layers and cathode were prepared by vacuum evaporation. The results show that the flexible OLED device with PEDOT:PSS/HAT-CN composite film as hole injection layer has the best performance. The maximum current efficiency and power efficiency can reach 84 cd/A and 76 lm/W. The research shows that the surface of the flexible substrate modified by PEDOT:PSS has better continuity and smoothness

so that the phenomenon of leakage and short circuit is reduced; meanwhile

the composite film of PET/ITO/PEDOT:PSS/HAT-CN has a higher transmittance in green light band

which can improve the extraction efficiency of the device. Moreover

the injection of carriers in this device is in balance

increasing the compound probability of electrons and holes.

关键词

Keywords

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