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Organic light-emitting diode (OLED) with structure of ITO/CuPc/NPB/Alq3/LiF/Al was fabricated,and the magnetic field effect on the injection current (magnetoconductance or MC effect) at 300 K,260 K,220 K,and 180 K were measured at constant voltage bias. During the transition of injection current from bipolar current to unipolar current,the MC of the device increased firstly and fell with the decreasing current. The MC became smaller at the lower temperatures. However,under all measurement conditions,the values of the MC were always positive. The inversion of MC from positive to negative as reported in literatures was not observed. The experimental results demonstrate that the ±MC effects in OLED not only depend on the unipolar or bipolar current. It is also related with the organic materials and device structure. Using the magnetic field modulated electron-hole pair mechanism and bipolaron model,the positive MC effects in bipolar and unipolar injection current are interpreted, respectively.
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Keywords:
- organic light-emitting diode /
- magnetoconductance /
- bipolaron
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[20] Campbell A J,Bradley D D C,Lidzey D G 1997 J. Appl. Phys. 82 6326
[21] Liu X J,Gao K,Li Y,Wei J H,Xie S J 2007 Chin. Phys. 16 1
[22] Voss K F,Foster C M,Smilowitz L,Mihailovic ' D,Askari S, Srdanov G,Ni Z,Shi S,Heeger A J,Wudl F 1991 Phys.
[23] Lai C M,Meng H F 1996 Phys. Rev. B54 16365
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[1] Li T C,Liu Z J,Wang K Y 2003 Acta Phys. Sin. 52 2912 (in Chinese) [李统藏、刘之景、王克逸 2003 52 2912]
[2] Xiong Z H,Wu D,Vardney Z V,Shi J 2004 Nature 427 821
[3] Rev. B43 5109
[4] Ren J F,Fu J Y,Liu D S,Xie S J 2004 Acta Phys. Sin. 53 3814 (in Chinese) [任俊峰、付吉永、刘德胜、谢士杰 2004 53 3814]
[5] Pang Z Y,Chen Y X,Liu T T,Zhang Y P,Xie S J,Yan S S,Han S H 2006 Chin. Phys. Lett. 23 1566
[6] Ren J F,Zhang Y B,Xie S J 2007 Acta Phys. Sin. 56 4785 (in Chinese) [任俊峰、张玉滨、谢士杰 2007 56 4785]
[7] Naber W J M,Faez S,van der Wiel W G 2007 J. Phys D: Appl. Phys. 40 205
[8] Kalinowski J,Cocchi M,Virgili D,Marco D P,Fattori V 2003 Chem. Phys. Lett. 380 710
[9] Wang Z,He Z H,Tan X W,Tao M L,Li G Q,Xiong Z H 2007 Acta Phy. Sin. 56 2979 (in Chinese) [王 振、何正红、谭兴文、陶敏龙、李国庆、熊祖洪 2007 56 2979]
[10] Hu B,Wu Y 2007 Nature Mater. 6 985
[11] Desai P,Shakya P,Kreouzis T,Gillin W P 2007 J. Appl. Phys. 102 073710
[12] Bobbert P A,Nguyen T D,van Oost F W A,Koopmans B,Wohlgenannt M 2007 Phys. Rev. Lett. 99 216801
[13] Nguyen T D,Sheng Y,Rybicki J,Wohlgenannt M 2008 Phys. Rev. B77 235209
[14] Bloom F L,Wagemans W,Kemerink M,Koopmans B 2007 Phys. Rev. Lett. 99 257201
[15] Bloom F L,Wagemans W,Kemerink M,Koopmans B 2008 Appl. Phys. Lett. 93 263302
[16] Bloom F L,Kemerink M,Wagemans W,Koopmans B 2009 Phys. Rev. Lett. 103 066601
[17] Liu R,Zhang Y,Lei Y L,Chen P,Xiong Z H 2009 J. Appl. Phys. 105 093719
[18] Zhang Y,Liu R,Lei Y L,Xiong Z H 2009 Appl. Phys. Lett. 94 083307
[19] Lei Y L,Liu R,Zhang Y,Tan X W,Xiong Z H 2009 Acta Phy. Sin. 58 1269 (in Chinese) [雷衍连、刘 荣、张 勇、谭兴文、熊祖洪 2009 58 1269]
[20] Campbell A J,Bradley D D C,Lidzey D G 1997 J. Appl. Phys. 82 6326
[21] Liu X J,Gao K,Li Y,Wei J H,Xie S J 2007 Chin. Phys. 16 1
[22] Voss K F,Foster C M,Smilowitz L,Mihailovic ' D,Askari S, Srdanov G,Ni Z,Shi S,Heeger A J,Wudl F 1991 Phys.
[23] Lai C M,Meng H F 1996 Phys. Rev. B54 16365
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