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

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

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

Phys. Rev. B 92, 115203 – Published 2 September 2015

Abstract

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. Thus the observed spin- $1 / 2$ PLDMR is assigned to TPQ rather than SDR, even though the latter may also be present.

Received 1 August 2013

DOI:https://doi.org/10.1103/PhysRevB.92.115203

Authors & Affiliations

Ying Chen^1,*, Min Cai¹, Emily Hellerich¹, Ruth Shinar², and Joseph Shinar^1,†

¹Ames Laboratory – USDOE and Physics & Astronomy Department, Iowa State University, Ames, Iowa 50011, USA
²Microelectronics Research Center and Electrical & Computer Engineering Department, Iowa State University, Ames, Iowa 50011, USA

^*Corresponding author: chen2ying3@ufl.edu
^†Corresponding author: jshinar@iastate.edu

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Vol. 92, Iss. 11 — 15 September 2015

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Physical Review B

covering condensed matter and materials physics

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

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

Phys. Rev. B 92, 115203 – Published 2 September 2015

Abstract

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Physical Review B

covering condensed matter and materials physics

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

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

Phys. Rev. B 92, 115203 – Published 2 September 2015

Abstract

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