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| - Triplet-Polaron Quenching in Conjugated Polymers
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| - We studied the triplet-polaron quenching in a platinum(II) porphyrin- (PtOEP-) doped polyspirobifluorene(PSF-TAD) copolymer. The copolymer contains a hole-transporting phenylenediamine unit (TAD) as acomonomer. Triplet-polaron quenching was probed by the change in PtOEP phosphorescence lifetime underan applied voltage in a unipolar device. The charge-induced reduction of the optically excited lifetime ofPtOEP is one-third for the highest applied bias. The charge density can be obtained from current−voltagecharacteristics in the space-charge-limited (SCL) regime. The obtained hole mobility under SCL conditionsis (7 ± 2) × 10-5 cm2/(V s). This result is in accord with recent mobility measurements of the time-of-flightmobility in our polymer. The triplet-polaron recombination constant was evaluated to be (4 ± 1) × 10-13cm3/s, implying a triplet-polaron interaction radius of 2 × 10-10 m. The results show that triplet-polaronannihilation cannot be neglected in device models for phosphorescent light-emitting diodes.
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