High-efficiency red electrophosphorescence devices

Chihaya Adachi, Marc A. Baldo, Stephen R. Forrest, Sergey Lamansky, Mark E. Thompson, Raymond C. Kwong

研究成果: ジャーナルへの寄稿学術誌査読

730 被引用数 (Scopus)

抄録

We demonstrate high-efficiency red electrophosphorescent organic light-emitting devices employing bis(2-(2′-benzo[4,5-a]thienyl)pyridinato-N,C3′) iridium(acetylacetonate) [Btp2Ir(acac)] as a red phosphor. A maximum external quantum efficiency of ηext=(7.0±0.5)% and power efficiency of ηp = (4.6±0.5) lm/W are achieved at a current density of J=0.01 mA/cm2. At a higher current density of J=100 mA/cm2, ηext=(2.5±0.3)% and ηp=(0.56±0.05) lm/W are obtained. The electroluminescent spectrum has a maximum at a wavelength of λmax=616 nm with additional intensity peaks at λsub=670 and 745 nm. The Commission Internationale de L'Eclairage coordinates of (cursive Greek chi=0.68, y=0.32) are close to meeting video display standards. The short phosphorescence lifetime (∼4 μs) of Btp2Ir(acac) leads to a significant improvement in ηext at high currents as compared to the previously reported red phosphor, 2,3,7,8,12,13,17,18-octaethyl-12H, 23H-prophine platinum (II) PtOEP with a lifetime of ∼50 μs.

本文言語英語
ページ(範囲)1622-1624
ページ数3
ジャーナルApplied Physics Letters
78
11
DOI
出版ステータス出版済み - 3月 12 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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