Singlet and triplet exciton formation rates in conjugated polymer light-emitting diodes

被引：235

作者：

Shuai, Z

Beljonne, D

Silbey, RJ

Brédas, JL

机构：

[1] Univ Mons, Ctr Rech Elect & Photon Mol, Serv Chim Mat Nouveaux, B-7000 Mons, Belgium

[2] MIT, Dept Chem, Cambridge, MA 02139 USA

[3] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

[4] Univ Arizona, Dept Chem, Tucson, AZ 85721 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.84.131

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By applying a molecular orbital perturbation approach, we calculate the formation rates for singlet and triplet molecular excitons associated with intermolecular charge-transfer processes. It is found that the interchain bond-charge correlation has a strong influence on the relative probabilities for generating singlet and triplet excitons. Most importantly, application of our approach to a model system for poly(paraphenylenevinylene) shows that the ratio between the electroluminescence and photoluminescence quantum yields generally exceeds the 25% spin-degeneracy statistical limit.

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页码：131 / 134

页数：4

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