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Proceedings Paper

High efficiency phosphorescent organic light-emitting devices with a new organic material as the host of the emitting layer
Author(s): Hsin-Hung Tsai; Jiun-Haw Lee; Man-Kit Leung
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Paper Abstract

In this paper, we demonstrate a phosphorescent organic light emitting device (PHOLED) with low turn-on voltage by using a n-type organic material as the host of the emitting layer (EML) doped with green emitting complex, fac tris(2-phenylpyridine) iridium Ir(ppy)3. This material exhibits high glass transition temperature (over 200 °C) that may help to elongate the operation lifetime. We compare our devices to the classical 4,4'-N,N'-dicarbazole-biphenyl (CBP) based green device. Driving voltage of the CBP and the new-host based OLED is 16 and 11 V with the current density of 100mA/cm2, respectively. The lower driving voltage of the new-host based device comes from the lower HOMO value, i.e. 5.7 eV, which is nearly the same as that of NPB. The current efficiency at 10000 cd/m2 is slightly decreased from 24 to 21 cd/A. However, the power efficiency is increased from 5 to 6 lm/W.

Paper Details

Date Published: 9 October 2005
PDF: 6 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593722 (9 October 2005); doi: 10.1117/12.618897
Show Author Affiliations
Hsin-Hung Tsai, National Taiwan Univ. (Taiwan)
Jiun-Haw Lee, National Taiwan Univ. (Taiwan)
Man-Kit Leung, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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