Proceedings of the Polymer Society of Korea Conference (한국고분자학회:학술대회논문집)

The Polymer Society of Korea (한국고분자학회)
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Intramolecular Energy Transfer in Heteroleptic Red Phosphorescent Organic Light Emitting Diodes

  • Lee, Jun-Yeob (Department of Polymer Science and Engineering, Dankook University) ;
  • Kim, Sung-Hyun (Department of Polymer Science and Engineering, Dankook University) ;
  • Jang, Jyong-Sik (School of Chemical and Biological Engineering, Seouol National University)
  • Published : 2006.10.13
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Abstract

Intramolecular energy transfer in heteroleptic red phosphorescent dopant materials with mixed ligand units in one molecule was studied. 1-phenylisoquinoline(piq) and phenylpyridine(ppy) moieties were introduced as ligands for Ir based phosphorescent dopants and light emission mechanism was investigated. Intramolecular energy transfer from ppy ligand to piq ligand resulted in pure red emission without any green emission from ppy. Current efficiency of red devices was improved from 4 cd/A to 4.8 cd/A by using mixed ligand structures and deposition temperature of red dopant could be lowered by introducing ppy ligand.

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