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A versatile color tuning strategy for iridium(III) and platinum(II) electrophosphors by shifting the charge-transfer states with an electron-deficient core
Zhou, Gui-Jiang1,2,3; Wang, Qi4; Wong, Wai-Yeung1,2; Ma, Dongge4; Wang, Lixiang4; Lin, Zhenyang5
2009
Source PublicationJOURNAL OF MATERIALS CHEMISTRY
ISSN0959-9428
Volume19Issue:13Pages:1872-1883
AbstractBy fusing an electron-deficient ring system with the phenyl ring of a 2-phenylpyridine (ppy)-type ligand, a new and synthetically versatile strategy for the phosphorescence color tuning of cyclometalated iridium(III) and platinum(II) metallophosphors has been established. Two robust red electrophosphors with enhanced electron-injection/electron-transporting features were prepared by using an electron-trapping fluoren-9-one chromophore in the ligand design. The thermal, photophysical, redox and electrophosphorescent properties of these complexes are reported. These exciting results can be attributed to a switch of the metal-to-ligand charge-transfer (MLCT) character of the transition from the pyridyl groups in the traditional Ir(III) or Pt(II) ppy-type complexes to the electron-deficient ring core, and the spectral assignments corroborate well with the electrochemical data as well as the timedependent density functional theory (TD-DFT) calculations. The electron-withdrawing character of the fused ring results in much more stable MLCT states, inducing a substantial red-shift of the triplet emission energy from yellow to red for the Ir(III) complex and even green to red for the PtII counterpart. Electrophosphorescent organic light-emitting devices (OLEDs) doped with these red emitters fabricated by using vacuum evaporation technique have been realized with reasonable performance.
DOI10.1039/b814507e
Indexed BySCI
Language英语
WOS IDWOS:000264254500014
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:66[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/66398
Collection中国科学院化学研究所
Corresponding AuthorWong, Wai-Yeung
Affiliation1.Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China
2.Hong Kong Baptist Univ, Ctr Adv Luminescence Mat, Kowloon Tong, Hong Kong, Peoples R China
3.Xi An Jiao Tong Univ, Dept Chem, Fac Sci, Xian 710049, Peoples R China
4.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
5.Hong Kong Univ Sci & Technol, Dept Chem, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Gui-Jiang,Wang, Qi,Wong, Wai-Yeung,et al. A versatile color tuning strategy for iridium(III) and platinum(II) electrophosphors by shifting the charge-transfer states with an electron-deficient core[J]. JOURNAL OF MATERIALS CHEMISTRY,2009,19(13):1872-1883.
APA Zhou, Gui-Jiang,Wang, Qi,Wong, Wai-Yeung,Ma, Dongge,Wang, Lixiang,&Lin, Zhenyang.(2009).A versatile color tuning strategy for iridium(III) and platinum(II) electrophosphors by shifting the charge-transfer states with an electron-deficient core.JOURNAL OF MATERIALS CHEMISTRY,19(13),1872-1883.
MLA Zhou, Gui-Jiang,et al."A versatile color tuning strategy for iridium(III) and platinum(II) electrophosphors by shifting the charge-transfer states with an electron-deficient core".JOURNAL OF MATERIALS CHEMISTRY 19.13(2009):1872-1883.
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