FLUORESCENCE-SPECTRUM OF A BLUE-PHASE POLYDIACETYLENE OBTAINED BY PROBE SATURATION SPECTROSCOPY

被引：27

作者：

YASUDA, A

YOSHIZAWA, M

KOBAYASHI, T

机构：

[1] Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo, 113

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 209卷 / 03期

关键词：

D O I：

10.1016/0009-2614(93)80108-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dependence of the transient difference transmission spectrum on probe-light intensity was investigated for a blue-phase polydiacetylene with side groups of substituted urethanes. The spectra of stimulated emission and photoinduced absorption of the lowest B-1(u) exciton were separately determined in the polymer, which exhibits extremely weak fluorescence with quantum efficiency < 10(-5) and ultrashort lifetime of 140 fs, by ''probe saturation spectroscopy'' newly proposed here. The fluorescence spectrum calculated from the stimulated emission spectrum has a peak near 1.9 eV and is an approximate mirror image to the stationary absorption spectrum. The relaxation time constant from the higher excited state m 1A(g) exciton to the lowest B-1(u) exciton is estimated to be shorter than 50 fs.

引用

页码：281 / 286

页数：6

共 21 条

[1] NONLINEAR OPTICAL PROCESSES IN A POLYDIACETYLENE MEASURED WITH FEMTOSECOND DURATION LASER-PULSES [J].