Spin mixed charge transfer states of iridium complex Ir(ppy)(3): transient absorption and time-resolved photoluminescence

	Spin mixed charge transfer states of iridium complex Ir(ppy)(3): transient absorption and time-resolved photoluminescence
	Mehata, Mohan Singh 1,2; Yang, Yang 1; Qu, Zong-Jing 1; Chen, Jun-Sheng 1; Zhao, Feng-Jiao 1; Han, Ke-Li 1
刊名	rsc advances
	2015
卷号	5 期号:43 页码:34094-34099
英文摘要	nanosecond transient absorption and time-resolved spectroscopic techniques were applied to study an organometallic phosphorescent emitter ir(ppy)(3) complex, tris[2-phenylpyridinato-c-2, n] iridium(iii) dissolved in tetrahydrofuran (thf) under degassed conditions at ambient temperature. transient absorption curves obtained at a pump pulse of 355 nm and at a probe wavelength of 430-600 nm show positive and negative signals, indicating triplet-triplet (t-t) absorption and triplet-singlet (t-s) emission. tri-exponential global fitted transient absorption curves and time-resolved photoluminescence (pl) decays demonstrated the presence of four close low lying triplet states, of which, two emit green pl with a lifetime of 210 ns and 1.71 mu s. the emitting states are spin mixed metal-to-ligand charge transfer ((mlct)-m-3) states produced from a non-equilibrium (mlct)-m-1 state following fast intersystem crossing (isc), whereas the (mlct)-m-1 state is produced directly and indirectly depending on the excitation wavelength. moreover, the electronic structures for the ground state and low-lying excited states of ir(ppy)(3) were studied using quantum chemistry calculations.
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, multidisciplinary
研究领域[WOS]	chemistry
关键词[WOS]	photophysical properties ; efficiency ; tris(2-phenylpyridine)iridium ; phosphorescence ; fluorescence ; molecules ; devices ; films
收录类别	SCI
语种	英语
WOS记录号	WOS:000353167500049
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/146203]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China 2.Delhi Technol Univ, Dept Appl Phys, Laser Spect Lab, Delhi 110042, India
推荐引用方式 GB/T 7714	Mehata, Mohan Singh,Yang, Yang,Qu, Zong-Jing,et al. Spin mixed charge transfer states of iridium complex Ir(ppy)(3): transient absorption and time-resolved photoluminescence[J]. rsc advances,2015,5(43):34094-34099.
APA	Mehata, Mohan Singh,Yang, Yang,Qu, Zong-Jing,Chen, Jun-Sheng,Zhao, Feng-Jiao,&Han, Ke-Li.(2015).Spin mixed charge transfer states of iridium complex Ir(ppy)(3): transient absorption and time-resolved photoluminescence.rsc advances,5(43),34094-34099.
MLA	Mehata, Mohan Singh,et al."Spin mixed charge transfer states of iridium complex Ir(ppy)(3): transient absorption and time-resolved photoluminescence".rsc advances 5.43(2015):34094-34099.