Spin-dependent delayed luminescence from nongeminate pairs of polarons in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>π</mi></math></span>-conjugated polymers

M. Wohlgenannt; C. Yang; Z. V. Vardeny

doi:10.1103/PhysRevB.66.241201

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Spin-dependent delayed luminescence from nongeminate pairs of polarons in $π$ -conjugated polymers

M. Wohlgenannt, C. Yang, and Z. V. Vardeny

Phys. Rev. B 66, 241201(R) – Published 12 December 2002

Abstract

We measured cw photoinduced absorption (PA) and spin- $\frac{1}{2}$ PA- and photoluminescence detected magnetic resonance (PADMR and PLDMR, respectively) in films of two representative $π$ -conjugated polymers; poly(phenylene-vinylene) and polythiophene. From the dependences of the polaron PA and PLDMR on the laser excitation intensity we conclude that the PLDMR is due to spin-dependent delayed luminescence from nongeminate pairs of polarons. Our findings imply that spin-dependent exciton formation in polymer light-emitting diodes leads to enhanced emission efficiency.

Received 5 September 2002

DOI:https://doi.org/10.1103/PhysRevB.66.241201

Authors & Affiliations

M. Wohlgenannt¹, C. Yang², and Z. V. Vardeny²

¹Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242-1479
²Physics Department, University of Utah, 115 S 1400 E, Salt Lake City, Utah 84112-0830

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Vol. 66, Iss. 24 — 15 December 2002

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