Highly efficient and stable red phosphorescent organic light-emitting device using bis[2-(2-benzothiazoyl)phenolato]zinc(II) as host material

Hiroshi Kanno, Kaori Ishikawa, Yoshitaka Nishio, Ayataka Endo, Chihaya Adachi, Kenichi Shibata

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

The red-emitting phosphorescent organic light-emitting device employing Bis[2-(2-benzothiazoyl)phenolato]zinc(II) (Zn (BTP)2) as a host material has been demonstrated. The device generates saturated red emission with Commission Internationale de l'Eclairage coordinates of (0.67, 0.33), characterized by a low driving voltage of 3.2 V and high external quantum efficiency of 10.3% at 10 mA cm2. Moreover, the efficiency and lifetime are improved by using 30% NPB-doped Zn (BTP)2 host in the emitting layer, where NPB is 4, 4′ -bis (N -phenyl-1-naphthyl-amino)biphenyl. The maximum external quantum efficiency of the device reaches 12.6% at 1.7 mA cm2. The device has exhibited excellent stability. The half-luminance lifetime is 240 h at 80 mA cm2 (initial luminance of 6070 cd m2). The relationship between the employed host material and device performance is discussed.

Original languageEnglish
Article number123509
JournalApplied Physics Letters
Volume90
Issue number12
DOIs
Publication statusPublished - Mar 30 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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