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Spin mixed charge transfer states of iridium complex Ir(ppy)(3): transient absorption and time-resolved photoluminescence
Mehata, Mohan Singh1,2; Yang, Yang1; Qu, Zong-Jing1; Chen, Jun-Sheng1; Zhao, Feng-Jiao1; Han, Ke-Li1
刊名RSC ADVANCES
2015
DOI10.1039/c5ra01404b
5期:43页:34094-34099
收录类别SCI
文章类型Article
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
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.
语种英语
WOS记录号WOS:000353167500049
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/146203
专题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
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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.
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