Ultrafast dynamics of lattice relaxation of excitons in quasi-one-dimensional halogen-bridged platinum complexes
Ultrafast dynamics of lattice relaxation of excitons in quasi-one-dimensional halogen-bridged platinum complexes
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DOI：
10.1103/physrevb.66.155112
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发表时间：
2002-10-15
影响因子：
3.7
通讯作者：
Kurita, S
中科院分区：
文献类型：
--
作者：
Tomimoto, S;Saito, S;Kurita, S
用飞秒时间分辨发光光谱研究了准一维卤素桥联铂配合物[Pt（en）（2）][Pt（en）（2）X-2]（ClO 4）（4）（简称Pt-X，X=Cl，Br或I）的光激发态随时间的演化.在Pt-Cl中，在自陷激子（STE）发光带的低能侧发现了新的短寿命热发光。STE的振动弛豫很好地解释了2 ps内的STE发光带的整体行为。的行为再现的模型计算的基础上波包传播的相互作用模式组成的频率色散体声子。该模型也适用于Pt-Br中的先前结果。对Pt-Cl和Pt-Br的相互作用模，计算了声子的频率谱。在Pt-I中，STE发光衰减比在Pt-Cl和Pt-Br中快得多，表明存在更有效的非辐射衰减通道。
The temporal evolution of the photoexcited state in quasi-one-dimensional (1D) halogen-bridged platinum complexes [Pt(en)(2)][Pt(en)(2)X-2](ClO4)(4) (abbreviated as Pt-X, X=Cl, Br or I), has been comprehensively studied by femtosecond time-resolved luminescence spectroscopy. In Pt-Cl, new short-lived hot luminescence is found in the low-energy side of a self-trapped exciton (STE) luminescence band. The overall behavior of the STE luminescence band within 2 ps is well explained by the vibrational relaxation of the STE. The behavior is reproduced by a model calculation based on wave packet propagation on an interaction mode composed of frequency-dispersed bulk phonons. This model is also applied to the previous results in Pt-Br. For both Pt-Cl and Pt-Br, the frequency spectra of phonons which compose the interaction mode have been estimated. In Pt-I, the STE luminescence decays much faster than those in Pt-Cl and Pt-Br, showing existence of more effective nonradiative decay channel.