Recent developments in blue phosphorescent materials derived from phenylpyrazole iridium(III) complexes

INOR 990

Tissa Sajoto, sajoto@usc.edu, Arnold B. Tamayo, atamayo@usc.edu, Peter I. Djurovich, djurovic@usc.edu, and Mark E. Thompson, met@usc.edu. Department of Chemistry, University of Southern California, Los Angeles, CA 90089

Organometallic complexes with cyclometalated ligands (e.g. phenylpyridines (ppy), phenylpyrazoles (ppz), and their derivatives) have been given considerable interest in the past years due to their applications in OLEDs. Unlike the highly emissive fac-Ir(ppy)3, fac-Ir(ppz)3 is nonemissive at RT in fluid solution but, displays deep-blue/violet phosphorescence (414 nm) at 77K.  Extending the ppz pi-system from phenyl to fluorenyl (fac-flzIr) lowers the triplet energy (477 nm) and leads to efficient emission at RT. We have prepared new derivatives of Ir(ppz)3 with other substituents (Z= Ph, NPh2, and carbazole) which exhibit emission maximum in the range of 414 and 477 nm.  This presentation will describe the photophysical, electrochemical, and excited state properties of these new Ir(ppz)3 derivatives. The effect of different ancillary ligands (L^X) on the properties of these complexes will also be discussed.

 

Z= H, Ph, flz, NPh2, carbazole

 

Materials: Characterization
9:00 AM-11:00 AM, Thursday, 14 September 2006 Moscone Center -- Room 301, Oral

Division of Inorganic Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006