Ligand Effects on Luminescence of New Type Blue Light-Emitting Mono(2-phenylpyridinato)iridium(III) Complexes
作者:Min-Sik Eum、Chong Shik Chin、Song yi Kim、Choongil Kim、Sung Kwon Kang、Nam Hwi Hur、Ji Hoon Seo、Gu Young Kim、Young Kwan Kim
DOI:10.1021/ic800376e
日期:2008.7.1
Newly prepared hydrido iridium(III) complexes [Ir(ppy)(PPh3)(2)(H)L](0,+) (ppy = bidentate 2-phenylpyridinato anionic ligand; L = MeCN (1b), CO (1c), CN- (1d); H being trans to the nitrogen of ppy ligand) emit blue light at the emission lambda(max) (452-457, 483-487 nm) significantly shorter than those (468, 495 nm) of the chloro complex Ir(ppy)(PPh3)(2)(H)(Cl) (1a). Replacing ppy of 1a-d with F(2)ppy (2,4-difluoro-2-phenylpyridinato anion) and F(2)Meppy (2,4-difluoro-2-phenyl-m-methylpyridinato anion) brings further blue-shifts down to the emission lambda(max) at 439-441 and 465-467 nm with CIE color coordinates being x = 0.16 and y = 0.18-0.20 to display a deep-blue photoemission. No significant blue shift is observed by replacing PPh3 of 1a with PPh2Me to produce Ir(ppy)(PPh2Me)(2)(H)(Cl) (1aPPh(2)Me), which displays emission lambda(max) at 467 and 494 nm. The chloro complexes, [Ir(ppy)(PPh3)(2)(Cl)(L)](0,+) (L = MeCN (2b), CO (2c), CN- (2d)) having a chlorine ligand trans to the nitrogen of ppy also emit deep-blue light at emission lambda(max) 452-457 and 482-487 nm.