Home > Archive>Volume 14, Issue 4, 2018 >262-266. DOI:10.1007/s11801-018-8018-9
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Effects of organic acids modified ITO anodes on luminescent properties and stability of OLED devices
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1. Key Lab of Special Display Technology, Ministry of Education, National Engineering Lab of Special Display Technology, State Key Lab of Advanced Display Technology, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei 230009, China;2. School of Instrument Science and Opto-electronics Engineering, HefeiUniversity of Technology, Hefei 230009, China

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    Abstract:

    In this paper, p-chlorophenylacetic acid and p-fluorophenylacetic acid were applied to modify the indium tin oxide (ITO) electrodes. The surface work functions of unmodified ITO, p-chlorophenylacetic acid modified ITO (Cl-ITO) and p-fluorophenylacetic acid modified ITO (F-ITO) are 5.0 eV, 5.26 eV and 5.14 eV, respectively, and the water contact angles are 7.3°, 59.1° and 46.5°, respectively. The increase of the work function makes the hole injection ability of the devices improved, which is proved by the hole transport devices. The self-assembly (SAM) layers transfer hydrophilic ITO to hydrophobic ITO, which makes ITO more compatible with the hydrophobic organic layers, making the organic film more stable during the operation. After modification, the organic light emitting diodes (OLEDs), SAM-modified ITO/NPB/Alq3/LiF/Al, with better performance and stability were fabricated. Especially, the OLED with Cl-ITO (Cl-OLED) has a maximum luminance of 22 428 cd/m2 (improved by 32.9%) and a half-lifetime of 46 h. Our results suggest that employing organic acids to modify ITO surface can enhance the stability and the luminescent properties of OLED devices.

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HU Jun-tao, YE Kang-li, HUANG Yang, WANG Peng, XU Kai, WANG Xiang-hua. Effects of organic acids modified ITO anodes on luminescent properties and stability of OLED devices[J]. Optoelectronics Letters,2018,14(4):262-266

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History
  • Received:January 30,2018
  • Revised:March 13,2018
  • Online: July 26,2018
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