한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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A Spirobenzofluorene Type Phosphine Oxide Molecule as A Triplet Host and An Electron Transport Material for High Efficiency in Phosphorescent Organic Light-Emitting Diodes

  • Jang, Sang-Eok (Department of Polymer Science and Engineering, Dankook University) ;
  • Jeon, Soon-Ok (Department of Polymer Science and Engineering, Dankook University) ;
  • Yook, Kyoung-Soo (Department of Polymer Science and Engineering, Dankook University) ;
  • Joo, Chul-Woong (Department of Polymer Science and Engineering, Dankook University) ;
  • Son, Hyo-Suk (Department of Polymer Science and Engineering, Dankook University) ;
  • Lee, Jun-Yeob (Department of Polymer Science and Engineering, Dankook University)
  • Published : 2009.10.12
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Abstract

We synthesized a spirobenzofluorene type phosphine oxide (SPPO2) as a new triplet host and an universal electron transport material for phosphorescent organic light-emitting diodes(PHOLEDs). Red PHOLEDs with the SPPO2 host material showed a high quantum efficiency of 14.3 % with a current efficiency of 20.4 cd/A. In addition, the SPPO2 could be applied as an electron transport material which can be matched with any host material due to the lowest unoccupied molecular orbital of 2.4 eV. Electron injection from a cathode to the SPPO2 electron transport layer was better than common electron transport materials. In particular, the SPPO2 was effective as the electron transport material in blue PHOLEDs and the quantum efficiency was more than doubled and driving voltage was lowered by more than 3 V using the SPPO2 instead of common electron transport material.

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