Abstract
New blue-phosphorescent iridium complexes containing pyridyltriazole derivatives (trzl-CH2OMe) as main ligands and benzyldiphenylphosphines (bdp) as ancillary ligands were synthesized and their photophysical properties were investigated. As a main ligand, 2-(5-(methoxymethyl)-2H-1,2,4-triazol-3-yl) pyridine (trzl-CH2OMe), which has the strong electron-withdrawing ability was chosen to give the deep blue emission of its iridium complexes. As ancillary ligands, bdp and bdp-F2, were employed where they represents benzyldiphenylphosphine and (3,5-difluorobenzyl)-diphenylphosphine, respectively. The resulting iridium complexes, Ir(trzl-CH2OMe)2(bdp) and Ir(trzl-CH2OMe)2(bdp-F2), exhibited the blue emission at 484 and 481 nm in CH2Cl2 solution, respectively. These emission was blue shifted, compared to that of the previously reported Ir complex containing a fluorinated phenylpyridine and bdp, Ir(4-Me-4′-F-ppy)2(bdp) at 491 nm. We also investigated the solid state luminescence properties of the complexes prepared herein in a polymer film of PMMA (poly (methylmetacrylate)) for their application to the polymeric process.
Acknowledgement
This work was supported by National Research Foundation of Korea Grant funded by the Korean Government (2009-0065382).