Measurement of the S0-T1 energy gap in poly(2-methoxy,5-(2′-ethyl-hexoxy)-p-phenylenevinylene) by triplet-triplet energy transfer

被引：91

作者：

Monkman, AP ^{[1
]}

Burrows, HD

Miguel, MD

Hamblett, I

Navaratnam, S

机构：

[1] Univ Durham, Dept Phys, Durham, England

[2] Univ Coimbra, Dept Chem, P-3049 Coimbra, Portugal

[3] Christie Hosp, Paterson Inst Canc Res, Manchester, Lancs, England

来源：

CHEMICAL PHYSICS LETTERS | 1999年 / 307卷 / 5-6期

关键词：

D O I：

10.1016/S0009-2614(99)00541-2

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：

We have elucidated the lowest triplet state in the soluble luminescent conjugated polymer poly(2-methoxy,5-(2'-ethylhexoxy)-p-phenylenevinylene) (MEH-PPV) in benzene. Using a range of triplet sensitisers we determine that che S-0-T-1 energy separation is 1.27 +/- 0.07 eV. Triplet-triplet absorption is observed at 1.5 eV. In solution, the triplet state has a lifetime greater than or equal to 100 mu s. The molar absorption coefficient at 1.5 eV is concentration dependent; at 200 mg/l, epsilon = 1.19 x 10(5) M-1 cm(-1). Up to 50 mg/l, the triplet decay rate showed no change, indicating self-quenching of triplets is not significant. Oxygen quenches the MEH-PPV triplet, leading to singlet oxygen formation with a quantum yield of 2.5 +/- 1%. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：303 / 309

页数：7

共 35 条

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