TRIPLET EXCITON FORMATION DUE TO INTERACTION BETWEEN SINGLET EXCITONS IN POLYDIACETYLENE

被引：16

作者：

ICHIMURA, K

YOSHIZAWA, M

MATSUDA, H

OKADA, S

OHSUGI, MM

NAKANISHI, H

KOBAYASHI, T

机构：

[1] UNIV TOKYO,FAC SCI,DEPT PHYS,HONGO 7-3-1,BUNKYO KU,TOKYO 113,JAPAN

[2] RES INST POLYMERS & TEXT,TSUKUBA,IBARAKI 305,JAPAN

[3] TODA KOGYO CO LTD,NAKA KU,HIROSHIMA 730,JAPAN

来源：

JOURNAL OF CHEMICAL PHYSICS | 1993年 / 99卷 / 10期

关键词：

D O I：

10.1063/1.465721

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 time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1,3-butadiyne}) on femtosecond and picosecond time scales was -performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes approximately 200 fs, 1-2 ps, and much greater than 200 ps. These components are assigned to the free B-1(u) excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.

引用

页码：7404 / 7416

页数：13

共 41 条

[1] MAGNETIC-FIELD EFFECTS ON TRIPLET EXCITON FISSION AND FUSION IN A POLYDIACETYLENE [J].