| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Inverted Bottom-Emission Organic Light Emitting Diode Using Two n-Doped Layers for the Enhanced Performance |
| CHENG Cui-Ran, CHEN Yu-Huan, QIN Da-Shan**, QUAN Wei, LIU Jin-Suo |
Institute of Polymer Science and Engineering, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130
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| Cite this article: |
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CHENG Cui-Ran, CHEN Yu-Huan, QIN Da-Shan et al 2010 Chin. Phys. Lett. 27 117801 |
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Abstract We fabricate an inverted bottom-emission organic light emitting diode (IBOLED) employing two n-doped layers, i.e., 5 nm lithium carbonate doped PTCDA (1:2 Li2CO3:PTCDA) with 5 nm Li2CO3 doped BCP (1:4 Li2CO3:BCP) on top, where PTCDA and BCP stand for 3, 4, 9, 10 perylenetetracarboxylic dianhydride and bathcuporine, respectively. Compared to the IBOED using a layer of 10 nm 1:4 Li2CO3:BCP, the one utilizing the two-layer combination of 5 nm 1:2 Li2CO3:PTCDA and 5 nm 1:4 Li2CO3:BCP shows decreasing operation voltage and thereby increasing power efficiency, mainly attributed to the higher electron conductivity of 1:2 Li2CO3:PTCDA than that of 1:4 Li2CO3:BCP. The mechanism of the electron transport through the interface of 1:2 Li2CO3:PTCDA and 1:4 Li2CO3:BCP is also discussed. We provide a simply and effective structure to enhance the current conduction for IBOLEDs.
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| Keywords:
78.60.Fi
72.80.Le
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Received: 12 April 2010
Published: 22 October 2010
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| PACS: |
78.60.Fi
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(Electroluminescence)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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