Triplet-polaron quenching in conjugated polymers
Triplet-polaron quenching in conjugated polymers
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DOI：
10.1021/jp075556o
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发表时间：
2007-10-25
影响因子：
3.3
通讯作者：
Meerholz, K.
中科院分区：
文献类型：
--
作者：
Hertel, D.;Meerholz, K.
研究了铂卟啉-（PtOEP-）掺杂的聚螺二芴（PSF-PDR）共聚物中三重态极化子的猝灭。该共聚物含有空穴传输苯二胺单元（PEA）作为共聚单体。三重态极化子淬灭探测的PtOEP磷光寿命的变化下施加的电压在单极设备。PtOEP的光激发寿命的电荷诱导减少是三分之一的最高施加偏压。电荷密度可以从空间电荷限制（SCL）机制中的电流-电压特性获得。在SCL条件下得到的空穴迁移率为（7 2）× 10-（5）cml（2）/（Vs）.这一结果是在雅阁与最近的流动性测量的飞行时间的流动性在我们的聚合物。三重态-极化子复合常数为（4 1）× 10 ~（13）cm ~（3）/S，表明三重态-极化子相互作用半径为2 × 10 ~（10）m。结果表明，在磷光发光二极管的器件模型中，三重态极化子的湮灭是不可忽略的。
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 a comonomer. Triplet-polaron quenching was probed by the change in PtOEP phosphorescence lifetime under an applied voltage in a unipolar device. The charge-induced reduction of the optically excited lifetime of PtOEP is one-third for the highest applied bias. The charge density can be obtained from current-voltage characteristics in the space-charge-limited (SCL) regime. The obtained hole mobility under SCL conditions is (7 2) x 10-(5) cml(2)/(V s). This result is in accord with recent mobility measurements of the time-of-flight mobility in our polymer. The triplet-polaron recombination constant was evaluated to be (4 1) x 10-(13) cm (3)/S, implying a triplet-polaron interaction radius of 2 x 10-(10) m. The results show that triplet-polaron annihilation cannot be neglected in device models for phosphorescent light-emitting diodes.