A Synthesis and Luminescence Study of Ir(ppz)3 for Organic Light-Emitting Devices

Tris(1-phenyl-κC1-pyrazolato-κN2)iridium (Ir(ppz)3) was prepared and its luminescence properties were investigated for the application to organic light-emitting devices (OLEDs). The photoluminescence (PL) spectra of Ir(ppz)3 in dichloromethane showed a peak at 437 nm at room temperature. The lumines...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2004-04, Vol.77 (4), p.751-755
Main Authors: Nam, Eun Jeong, Kim, Jun Ho, Kim, Bong-Ok, Kim, Sung Min, Park, No Gill, Kim, Young Sik, Kim, Young Kwan, Ha, Yunkyoung
Format: Article
Language:English
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Summary:Tris(1-phenyl-κC1-pyrazolato-κN2)iridium (Ir(ppz)3) was prepared and its luminescence properties were investigated for the application to organic light-emitting devices (OLEDs). The photoluminescence (PL) spectra of Ir(ppz)3 in dichloromethane showed a peak at 437 nm at room temperature. The luminescent lifetime of an Ir(ppz)3 film doped in CBP was found to be 218 ns, which indicated that its emission is phosphorescent. OLEDs were fabricated with doped films of Ir(ppz)3 in several hosts, and the electroluminescence (EL) peak was observed at 450 nm. The luminance of OLEDs was pure blue, with the CIE coordinates of x = 0.158, y = 0.139 at 100 cd/m2, but luminous efficiencies were low since the LUMO of Ir(ppz)3 is higher than those of the hosts used.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.77.751