High Quantum Efficiency in Organic Light-Emitting Devices with Iridium-Complex as a Triplet Emissive Center

Multilayer organic light-emitting devices with phosphorescent guest emitter, tris(2-phenylpyridine) iridium doped in a host 4,4 ′ -N,N ′ -dicarbazol-biphenyl layer were prepared. The device with the 6.5 wt% guest emitter exhibited external quantum efficiency and power luminous efficiency of 13.7% an...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 38; no. 12B; p. L1502
Main Authors Tsutsui, Tetsuo, Yang, Moon-Jae, Yahiro, Masayuki, Nakamura, Kenji, Watanabe, Teruichi, Tsuji, Taishi, Fukuda, Yoshinori, Wakimoto, Takeo, Miyaguchi, Satoshi
Format Journal Article
LanguageEnglish
Published 1999
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Summary:Multilayer organic light-emitting devices with phosphorescent guest emitter, tris(2-phenylpyridine) iridium doped in a host 4,4 ′ -N,N ′ -dicarbazol-biphenyl layer were prepared. The device with the 6.5 wt% guest emitter exhibited external quantum efficiency and power luminous efficiency of 13.7% and 38.3 lm/W, respectively at the luminance of 105 cd/m 2 driven at the voltage of 4.0 V and current density of 0.215 mA/cm 2 . The half decay lifetime under continuous constant-current driving for the initial luminance of 500 cd/m 2 was 170 h.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.38.L1502