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Origin of the positive spin-1/2 photoluminescence-detected magnetic resonance in pi-conjugated materials and devices

TitleOrigin of the positive spin-1/2 photoluminescence-detected magnetic resonance in pi-conjugated materials and devices
Publication TypeJournal Article
Year of Publication2015
AuthorsChen, Y, Cai, M, Hellerich, E, Shinar, R, Shinar, J
JournalPhysical Review B
Volume92
Pagination115203
Date Published09
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000360425400005
Keywordslight-emitting-diodes, polaron, polymers, singlet
Abstract

-ethyl)-hexoxy-1,4-phenylene vinylene) (MEH-PPV) films and poly(3-hexylthiophene) (P3HT) films is described, analyzed, and discussed. In particular, the models based on spin-dependent recombination of charge pairs (SDR) and triplet-polaron quenching (TPQ) are evaluated. By analyzing the dependence of the resonance amplitude on the microwave chopping (modulation) frequency using rate equations, it is demonstrated that the TPQ model can well explain the observed resonance behavior, while SDR model cannot reproduce the results of the observedDM-PLDMR. Thus the observed spin-1/2 PLDMR is assigned to TPQ rather than SDR, even though the latter may also be present.

DOI10.1103/PhysRevB.92.115203
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Photonics