Singlet-triplet splitting of geminate electron-hole pairs in conjugated polymers -: art. no. 066803

被引：48

作者：

Kadashchuk, A

Vakhnin, A

Blonski, I

Beljonne, D

Shuai, Z

Brédas, JL

Arkhipov, VI

Heremans, P

Emelianova, EV

Bässler, H

机构：

[1] Natl Acad Sci Ukraine, Inst Phys, UA-03028 Kiev, Ukraine

[2] Univ Mons Hainaut, B-7000 Mons, Belgium

[3] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[4] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China

[5] IMEC, B-3001 Heverlee, Belgium

[6] Univ Leuven, B-3001 Heverlee, Belgium

[7] Univ Marburg, Inst Phys Chem, D-35032 Marburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 06期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

D O I：

10.1103/PhysRevLett.93.066803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The singlet-triplet splitting of geminate polaron pairs in a ladder-type conjugated polymer has been studied by the thermally stimulated luminescence technique. The energy gap separating the singlet and triplet states of the geminate pairs is measured to be in the range of 3-6 meV, depending on the polymer morphology. The results of correlated quantum-chemical calculations on a long ladder-type oligomer are fully consistent with the observed values of the geminate polaron pair singlet-triplet gap. Such low splitting values have important implications for the spin-dependent exciton formation in conjugated polymers.

引用

页码：066803 / 1

页数：4

共 33 条

[1] Hopping model of thermally stimulated photoluminescence in disordered organic materials [J].