Journal
PHYSICAL REVIEW B
Volume 66, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.66.241201
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We measured cw photoinduced absorption (PA) and spin-1/2PA- and photoluminescence detected magnetic resonance (PADMR and PLDMR, respectively) in films of two representative pi-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.
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