New iridium derivatives with good electrophosphorescence properties

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

doi:10.1117/12.427005

8 May 2001 New iridium derivatives with good electrophosphorescence properties

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

Author Affiliations +

Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427005
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan

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.

Citation Download Citation

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, and Shuit-Tong Lee "New iridium derivatives with good electrophosphorescence properties", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); https://doi.org/10.1117/12.427005

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