Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials

Chihaya Adachi, Raymond C. Kwong, Peter Djurovich, Vadim Adamovich, Marc A. Baldo, Mark E. Thompson, Stephen R. Forrest

研究成果: Contribution to journalArticle査読

1032 被引用数 (Scopus)

抄録

Intermolecular energy transfer processes typically involve an exothermic transfer of energy from a donor site to a molecule with a substantially lower-energy excited state (trap). Here, we demonstrate that an endothermic energy transfer from a molecular organic host (donor) to an organometallic phosphor (trap) can lead to highly efficient blue electroluminescence. This demonstration of endothermic transfer employs iridium(III)bis(4,6-di-fluorophenyl)-pyridinato-N, C2′)picolinate as the phosphor. Due to the comparable energy of the phosphor triplet state relative to that of the 4,4′-N,N′-dicarbazole-biphenyl conductive host molecule into which it is doped, the rapid exothermic transfer of energy from phosphor to host, and subsequent slow endothermic transfer from host back to phosphor, is clearly observed. Using this unique triplet energy transfer process, we force emission from the higher-energy, blue triplet state of the phosphor (peak wavelength of 470 nm), obtaining a very high maximum organic light-emitting device external quantum efficiency of (5.7±0.3)% and a luminous power efficiency of (6.3±0.3)lm/W.

本文言語英語
ページ(範囲)2082-2084
ページ数3
ジャーナルApplied Physics Letters
79
13
DOI
出版ステータス出版済み - 9 24 2001
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)

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