Femtosecond ground state recovery: Measuring the intersystem crossing yield of polyspirobifluorene

被引：24

作者：

King, SM ^{[1
]}

Rothe, C ^{[1
]}

Dai, D ^{[1
]}

Monkman, AP ^{[1
]}

机构：

[1] Univ Durham, Dept Phys, Durham Photon Mat Inst, Durham DH1 3LE, England

来源：

JOURNAL OF CHEMICAL PHYSICS | 2006年 / 124卷 / 23期

关键词：

D O I：

10.1063/1.2206777

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：

Measurement of the quantum yield of triplet formation has been made for the prototypical conjugated polymer polyspirobifluorene in solution and solid state. An updated method has been described based on femtosecond time resolved ground state recovery following photoexcitation of the polymer. The two components to the recovery of the ground state due to the decay of the singlet and triplet excited states are clearly visible and from these it is possible to calculate Phi(T)=0.05 +/- 0.01 in solution, this gives k(isc)=5.4x10(7) s(-1) which compares favorably with other conjugated polymers. In polymer films an increased triplet yield of Phi(T)=0.12 +/- 0.02 is found to be independent of temperature, the increased yield is attributed to triplet recombination from charged states. (c) 2006 American Institute of Physics.

引用

页数：6

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