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Proceedings Paper

New iridium derivatives with good electrophosphorescence properties
Author(s): Man Wah Liu; Oi Yan Wong; Hong Zhi Xie; Tsz Cheung Wong; Bao Xiu Mi; Fu Lung Wong; Wai Lim Chan; Chun Sing Lee; Liang Sun Hung; Shuit-Tong Lee
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Paper Abstract

In this study, we synthesize a new iridium complex by introducing sterically bulky spacers into the framework of fac tris(2-phenylpyridine) iridium [Ir(ppy)3]. The main purpose is to reduce concentration quenching in Ir(ppy)3. The new complex exhibits a high (0.71) photoluminescence (PL) quantum yield in solution. The devices fabricated with the new Ir complex as an emitting dopant confirm that concentration quenching is almost negligible even at relatively high doping concentrations. For example, at a current density of 100 mA/cm2, the current efficiency for the devices with 7 and 26 wt% dopants are 8.9 and 10.2 cd/A respectively. These characteristics can be explained by a better energy transfer between the host and dopants upon introducing the sterically hindered spacers into the phosphorescent dyes.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427005
Show Author Affiliations
Man Wah Liu, City Univ. of Hong Kong (Hong Kong)
Oi Yan Wong, City Univ. of Hong Kong (Hong Kong)
Hong Zhi Xie, City Univ. of Hong Kong (Hong Kong)
Tsz Cheung Wong, City Univ. of Hong Kong (Hong Kong)
Bao Xiu Mi, City Univ. of Hong Kong (Hong Kong)
Fu Lung Wong, City Univ. of Hong Kong (Hong Kong)
Wai Lim Chan, City Univ. of Hong Kong (Hong Kong)
Chun Sing Lee, City Univ. of Hong Kong (Hong Kong)
Liang Sun Hung, City Univ. of Hong Kong (Hong Kong)
Shuit-Tong Lee, City Univ. of Hong Kong (Hong Kong)


Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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