EDMR of MEH-PPV LEDs
EDMR of MEH-PPV LEDs
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DOI：
10.1016/s0921-4526(01)00859-6
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发表时间：
2001-12-01
影响因子：
2.8
通讯作者：
Graeff, CFO
中科院分区：
文献类型：
--
作者：
Silva, GB;Santos, LF;Graeff, CFO
在这项工作中，X 波段的电检测磁共振 (EDMR) 用于研究聚(2-甲氧基-5-(2'-etil-hexiloxy)-1,4-亚苯基亚乙烯基) (MEH-PPV) 发光二极管 (LED) 的电子特性。 MEH-PPV LED 的 EDMR 信号由两条线组成，一条线宽为 5 G 的洛伦兹线，一条线宽为 24 G 的高斯线。这两个分量的 g 因子约为 2.002。 EDMR 信号幅度通常为 10(-5)，并且仅在正向偏压（V > 10 V）下观察到。该信号是猝灭信号，并被分配给两个带相同电荷的极化子与无自旋双极化子的自旋相关融合。洛伦兹分量归因于正极化子融合，高斯分量归因于负极化子融合。研究发现 EDMR 信号取决于载流子注入过程、极化子迁移率、温度以及间接取决于双极化子。 (C) 2001 Elsevier Science B.V. 保留所有权利。
In this work, electrically detected magnetic resonance (EDMR) at X-band is used to study the electronic properties of poly(2-metoxy-5-(2'-etil-hexiloxy)-1,4-phenylene vinylene) (MEH-PPV) light-emitting diodes (LEDs). The EDMR signal from MEH-PPV LEDs is found to be composed of two lines, a Lorentzian with peak-to-peak linewidth of 5 G, and a Gaussian with peak-to-peak linewidth of 24 G. The g-factor of both the components is about 2.002. The EDMR signal amplitude is typically 10(-5), and only observed at forward bias, for V > 10 V. The signal is a quenching, and is assigned to the spin-dependent fusion of two like-charged polarons to spinless bipolarons. The Lorentzian component is attributed to positive polarons fusion, and the Gaussian to negative polarons. The EDMR signal is found to depend on the process of carrier injection, polaron mobility, temperature and indirectly on bipolarons. (C) 2001 Elsevier Science B.V. All rights reserved.