Origin of the positive spin-12 photoluminescence-detected magnetic resonance in π-conjugated materials and devices

Chen, Ying; Cai, Min; Hellerich, Emily; Shinar, Ruth; Shinar, Joseph

doi:10.1103/PhysRevB.92.115203

Origin of the positive spin- $\frac{1}{2}$ photoluminescence-detected magnetic resonance in π-conjugated materials and devices

Journal Article · Wed Sep 02 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.115203· OSTI ID:1227420

Chen, Ying ^[1]; Cai, Min ^[1]; Hellerich, Emily ^[1]; Shinar, Ruth ^[2]; Shinar, Joseph ^[1]

Ames Lab., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)

The spin-1/2 single-modulation (SM) and double-modulation (DM) photoluminescence (PL) detected magnetic resonance (PLDMR) in poly(2-methoxy-5-(2'-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 observed DM-PLDMR. As a result, the observed spin-1/2 PLDMR is assigned to TPQ rather than SDR, even though the latter may also be present.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1227420

Alternate ID(s):: OSTI ID: 1213928

Report Number(s):: IS-J--8793

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 11 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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