ICCAS OpenIR
Role of Ligand-to-Metal Charge Transfer State in Nontriplet Photosensitization of Luminescent Europium Complex
Fu, Li-Min1; Ai, Xi-Cheng1; Li, Man-Yu1; Wen, Xiao-Fan2; Hao, Rui2; Wu, Yi-Shi3; Wang, Yuan2; Zhang, Jian-Ping1
2010-04-08
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY A
ISSN1089-5639
Volume114Issue:13Pages:4494-4500
AbstractWe have investigated, by means of steady-state and time-resolved optical spectroscopies, the excited-state dynamics of the luminescent europium complex Eu(III)(tta)(3)dpbt (ua = henoyltrifluoroacetonate; dbpt = 2-(N,N-diethylanilin-4-yl)-4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine) with Gd(III)(tta)(3)dpbt and Tb(III)(tta)(3)dpbt as the reference complexes that cannot be photosensitized. In the Eu(III)(tta)(3)dpbt complex, the ligand dpbt exhibited biphasic fluorescence decay kinetics; the faster component (decay time constant, 8.5 ps) is ascribed to the rapid conversion of the lowest-lying singlet excited state of dpbt (S(1) or (1)dpbt*) to a ligand-to-metal charge transfer singlet state of the complex ((1)LMCT*), whereas the slower one (1.8 ns) is shown by temperature-dependent luminescence spectroscopy to be delayed fluorescence due to the LMCT-to-dpbt backward energy transfer and represents the time scale of efficient excitation energy flow from the (1)LMCT* state to the state of Eu(III). On the basis of the spectroscopic results of the Ln(III)(tta)(3)dpbt complexes (Ln = Eu, Gd, and Tb), the crucial role of the (1)LMCT* state in photosensitization of the Eu(III)(tta)(3)dpbt complex is established, and a LMCT-mediated nontriplet sensitization mechanism is proposed, which is advantageous in high efficiency and low excitation photon energy as well as in low susceptibility against oxygen quenching.
DOI10.1021/jp9103189
Indexed BySCI
Language英语
WOS IDWOS:000276096800003
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/70522
Collection中国科学院化学研究所
Corresponding AuthorFu, Li-Min
Affiliation1.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China
2.Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Fu, Li-Min,Ai, Xi-Cheng,Li, Man-Yu,et al. Role of Ligand-to-Metal Charge Transfer State in Nontriplet Photosensitization of Luminescent Europium Complex[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2010,114(13):4494-4500.
APA Fu, Li-Min.,Ai, Xi-Cheng.,Li, Man-Yu.,Wen, Xiao-Fan.,Hao, Rui.,...&Zhang, Jian-Ping.(2010).Role of Ligand-to-Metal Charge Transfer State in Nontriplet Photosensitization of Luminescent Europium Complex.JOURNAL OF PHYSICAL CHEMISTRY A,114(13),4494-4500.
MLA Fu, Li-Min,et al."Role of Ligand-to-Metal Charge Transfer State in Nontriplet Photosensitization of Luminescent Europium Complex".JOURNAL OF PHYSICAL CHEMISTRY A 114.13(2010):4494-4500.
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