ICCAS OpenIR
Charge-recombination processes in oligomer- and polymer-based light- emitting diodes: A molecular picture
Beljonne, D; Shuai, ZG; Ye, AJ; Bredas, JL
2005-05-01
Source PublicationJOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
ISSN1071-0922
Volume13Issue:5Pages:419-427
AbstractAn overview of our recent work on the mechanisms of singlet and triplet exciton formation in electroluminescent pi-conjugated materials will be presented. According to simple spin statistics, only one-fourth of the excitons are formed as singlets. However, deviations from that statistics can occur if the initially formed triplet charge-transfer (CT) excited states are amenable to intersystem crossing or dissociation. Although the electronic couplings between the CT states and the neutral exciton states are expected to be largest for the lowest singlet and triplet excitons (S-1 and T-1, respectively), the possibility for direct recombination into T-1 is always very small due to the large exchange energy. In small molecules, spin statistics is expected to be observed because both singlet and triplet exciton formations proceed via higher-lying S-n/T-n states with similar electronic couplings and fast formation rates. In extended conjugated chains, however, that the (CT)-C-1 -> S-1 pathway is faster while the (CT)-C-3 -> T-n channels become much slower, opening the route to intersystem crossing or dissociation among the (CT)-C-3 states.
KeywordOrganic Light-emitting Diodes Polymer Light-emitting Diodes Singlet And Triplet Excitons Charge Transfer Charge Recombination Intersystem Crossing
Indexed BySCI
Language英语
WOS IDWOS:000236278800008
PublisherSOC INFORMATION DISPLAY
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/56312
Collection中国科学院化学研究所
Corresponding AuthorBeljonne, D
Affiliation1.Univ Mons, Lab Chem Novel Mat, B-7000 Mons, Belgium
2.Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA USA
3.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing, Peoples R China
4.Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA USA
5.Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA USA
Recommended Citation
GB/T 7714
Beljonne, D,Shuai, ZG,Ye, AJ,et al. Charge-recombination processes in oligomer- and polymer-based light- emitting diodes: A molecular picture[J]. JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY,2005,13(5):419-427.
APA Beljonne, D,Shuai, ZG,Ye, AJ,&Bredas, JL.(2005).Charge-recombination processes in oligomer- and polymer-based light- emitting diodes: A molecular picture.JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY,13(5),419-427.
MLA Beljonne, D,et al."Charge-recombination processes in oligomer- and polymer-based light- emitting diodes: A molecular picture".JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY 13.5(2005):419-427.
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