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首页> 外文会议>Symposium on Organic and Polymeric Materials and Devices―Optical, Electrical and Optoelectronic Properties Apr 1-5, 2002 San Francisco, California, U.S.A. >Electrically Detected Magnetic Resonance of MEH-PPV diodes
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Electrically Detected Magnetic Resonance of MEH-PPV diodes

机译：MEH-PPV二极管的电检测磁共振

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摘要

In this work electrically detected magnetic resonance (EDMR) is used to study the electronic properties of poly(2-methoxy-5-(2'-ethyl-hexoxy)-l,4-phenylene vinylene) (MEH-PPV) diodes. Two kinds of MEH-PPV diodes were characterized. The first one was a bipolar light emitting diode whose structure was ITO/MEH-PPV/A1. In this diode the EDMR signal is composed of two lines, a line that can be fitted by a lorentzian with peak-to-peak linewidth of 5.0 +- 0.5 G and the other best fitted with gaussian line with a linewidth of 24+- 1 G. The g factor of both components is 2.002 +- 0.001 and signals were only observed at forward bias. The second diode is a hole only device, with a structure ITO/MEH-PPV/Au, the EDMR signal in this case is dominated by a gaussian line with peak-to-peak linewidth of 5 +- 1 G and average g factor of 2.0014 +- 0.0002. In high forward bias (V > 30 volts at T = 130K) a second line could be observed with a linewidth of 10 +- 2 G and a g factor of 2.0012 +- 0.0004. The signal from both types of diodes is quenching, and tipically10~(-5) in amplitude. The EDMR signal is assigned to the spin-dependent fusion of two like-charged polarons. Our results indicate that the narrower component is coming from positive polarons while the broader to negative polarons.
机译：在这项工作中，电检测磁共振（EDMR）用于研究聚（2-甲氧基-5-（2'-乙基-己氧基）-1,4-亚苯基亚乙烯基）（MEH-PPV）二极管的电子性能。表征了两种MEH-PPV二极管。第一个是双极型发光二极管，其结构为ITO / MEH-PPV / A1。在此二极管中，EDMR信号由两条线组成，一条线可以由峰-峰线宽为5.0 +-0.5 G的洛伦兹拟合，另一条最好与线宽为24 +-1的高斯线拟合G.两种成分的g因子均为2.002±-0.001，仅在正向偏压下观察到信号。第二个二极管是仅空穴的器件，结构为ITO / MEH-PPV / Au，这种情况下的EDMR信号由高斯线控制，其峰峰线宽为5 + -1 G，平均g因子为2.0014 +/- 0.0002。在高正向偏压下（在T = 130K时V> 30伏），可以观察到第二条线，其线宽为10±2 G，g系数为2.0012±0.0004。两种类型的二极管发出的信号都是猝灭信号，幅度通常为10〜（-5）。 EDMR信号分配给两个带相同电荷的极化子的自旋相关融合。我们的结果表明，较窄的分量来自正极化子，而较宽的分量来自负极化子。

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