期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 29, 页码 4683-4696出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201000327
关键词
Phosphorescence; Luminescence; Sensors; Density functional calculations; OLEDs; Platinum
资金
- National Natural Science Foundation of China (NSFC) [20642003, 20634040, 20972024]
- Ministry of Education, Scientific Research Foundation for the Returned Overseas Chinese Scholars
- Specialized Research Fund for the Doctoral Program of Higher Education [200801410004]
- New Century Excellent Talents in University [08-0077]
- Changjiang Scholars and Innovative Research Team in University (PCSIRT) [IRT0711]
- State Key Laboratory of Fine Chemicals [KF0710, KF0802]
- State Key Laboratory of Chemo/Biosensing and Chemometrics [2008009]
- Education Department of Liaoning Province [2009T015]
- Dalian University of Technology [SFDUT07005, 1000-893394]
[(Aryl-ppy)Pt(acac)] (ppy = 2-phenylpyridine, acac = acetylacetonato) derivatives with triphenylamine (TPA) substituents on the ppy ligand have been prepared. The TPA fragment is either directly cyclometallated (Pt-1) or attached to the ppy ligand through a C-C single bond (Pt-2) or a novel alpha-diketo group (Pt-3). All the complexes show room-temperature phosphorescence in fluid solution with emission bands in the range of 530-590 nm, which are red-shifted relative to the model complex [ppyPt(acac)] (lambda(em) = 486 nm). This emission colour tuning effect is attributed to either an elevated HOMO energy caused by electron-donating TPA substituents on the ppy ligand or a decreased LUMO energy caused by the electron-trap effect of electron-withdrawing substituents; both result in a smaller HOMO-LUMO energy gap and thus red-shifted emission. The complexes show extended luminescence lifetimes (tau = 3.0-5.5 mu s) relative to the parent complex [ppyPt(acac)] (tau = 2.6 mu s). The luminescent oxygen-sensing properties of the complexes were studied in solution and polymer films. White light emission was observed with an OLED device fabricated with complex Pt-3 with CIE coordinates of (0.32, 0.32).
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