Magnetoconductance effect in organic light-emitting devices

被引：6
|
作者：
Zhang Yong [1 ]
Liu Ya-Li [1 ]
Jiao Wei [1 ]
Chen Lin [1 ]
Xiong Zu-Hong [1 ]
机构：
[1] Southwest Univ, Sch Phys Sci & Technol, Chongqing 400715, Peoples R China
来源：
ACTA PHYSICA SINICA | 2012年 / 61卷 / 11期
基金：
中国国家自然科学基金;
关键词：
organic light-emitting diode; magnetoconductance; bipolaron; electron-hole pair; MAGNETORESISTANCE;
D O I：
10.7498/aps.61.117106
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Organic light-emitting diode (OLED) based on tris-(8-hydroxyquinoline) aluminum(III) (Alq(3)) is fabricated, and its magnetoconductance (MC) effects are measured at different bias voltages. When the bias voltage is small, the OLED exhibits apparently a negative MC effect. After the bias voltage is increased, the MC value changes from negative to positive, displaying a negative-positive inversion. The MC effects in N, N'-Di(naphthalen-1-yl)-N, N' diphenyl-benzidine (NPB) and Copper phthalocyanine (CuPc) unipolar devices show that the negative MC effect in OLED comes from the CuPc layer in device. The MC effect of bipolar current can be explained using the electron-hole pair model. The MC effect of unipolar current can be attributed to the polaron-bipolaron transition in device. The positive-negative MC inversion in OLED results from the simultaneous contributions of the above two mechanisms during the variation of the injection current.
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页数：6
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