Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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The Effect of Polymer Thin Film for Sealing Buffer on the Characteristics of OLEO Device

OLED 소자의 특성에 미치는 밀봉 버퍼용 고분자박막의 영향

  • Lee, Bong-Sub (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Ju, Sung-Hoo (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Yang, Jae-Woong (Department of Advanced Materials Science and Engineering, Daejin University)
  • 이봉섭 (대진대학교 공과대학 신소재공학과) ;
  • 주성후 (대진대학교 공과대학 신소재공학과) ;
  • 양재용 (대진대학교 공과대학 신소재공학과)
  • Published : 2008.06.30
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Abstract

In this paper, the LiF and polymer thin film as passivation layer have been evaporated on green OLED devices. HDPE, polyacenaphthylene, polytetrafluoroethylene, poly(2,6-dimethyl-1,4-pheneylene oxide), poly sulfone and poly(dimer-acid-co-alkyl poly-amine) have been used as polymer materials. The optical transmittance of evaporated polymer thin film was very good as an above 90% in visible range. The morphology of polymer thin film was measured by AFM. As a result of the measurement average roughness($R_a$) value of the polysulfone was very low as 2.2 nm. The green OLED devices with a structure of ITO/HIL/HTL/EML/Buffer/Al in series of various passivation films were fabricated and analyzed. It was observed that an OLED device with LiF as first passivation film has shown the good electrical and optical property, and all kind of polymer films did not influence on the I-V-L characteristics and the life time of OLED devices. Therefore, we found that polymer layer played a key role as a buffer layer between the inorganic passivation layers to relieve the stress of the inorganic layers.

Keywords

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