Ultrafast dynamical study of self-trapped excitons in ladder type of halogen-bridged Pt complexes

被引：4

作者：

Suemoto, Tohru ^{[1
]}

Takahashi, Youtarou ^{[1
]}

Yasukawa, Keizo ^{[1
]}

Kawakami, Daisuke ^{[2
,3
]}

Takaishi, Shinya ^{[2
,3
]}

Yamashita, Masahiro ^{[2
,3
]}

Kobayashi, Atsushi ^{[4
]}

Kitagawa, Hiroshi ^{[4
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[2] Tohoku Univ, Grad Sch Sci, Dept Chem, Aoba Ku, Sendai, Miyagi 9808578, Japan

[3] CREST, Aoba Ku, Sendai, Miyagi 9808578, Japan

[4] Kyushu Univ, Fac Sci, Dept Chem, Fukuoka 8218581, Japan

来源：

JOURNAL OF LUMINESCENCE | 2008年 / 128卷 / 5-6期

关键词：

one-dimensional; halogen-bridged; self-trapped exciton; ultrafast luminescence spectroscopy;

D O I：

10.1016/j.jlumin.2007.11.004

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The properties and the dynamics of the excited states in out-of-phase ladder-type halogen-bridged Pt complexes (Pt-Br-out and Pt-I-out) are studied using femtosecond luminescence spectroscopy. In both materials, Gaussian-shaped broad luminescence bands with large Stokes shifts are found around 0.8 eV and assigned to self-trapped excitons (STE). The wave-packet oscillations with periods of 290 and 306 fs were observed in Pt-Br-out and Pt-I-out, respectively. The higher oscillation frequency in Pt-I-out compared with the one-dimensional (1D)-type Pt-I is ascribed to the smaller lattice relaxation in the ladder system. Although the lifetime of the STE is almost the same as that of the 1D-type Pt-Br, the lifetime in Pt-I-out is one order of magnitude longer than that in the 1D-type Pt-I. This is ascribed to the phase locking of the charge density wave due to the interchain interaction. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：1081 / 1083

页数：3

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