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Recombination Efficiency in Double-Layer Organic Light-Emitting Devices |
| XU Xue-Mei1,2;PENG Jing-Cui1;QU Shu1;LI Hong-Jian1;WU Jian-Hao2;OU-Yang Yu1 |
| 1Department of Applied Physics, Hunan University, Changsha 410082
2School of Physics Science and Technology, Central South University, Changsha 410083 |
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| Cite this article: |
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XU Xue-Mei, PENG Jing-Cui, QU Shu et al 2005 Chin. Phys. Lett. 22 719-722 |
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Abstract We analyse the influence of properties of organic/organic interface (OOI) on the characteristics of recombination efficiency of organic double-layer light-emitting diodes. Based on the disordered hopping theory model, spatial and energetic disorder of hopping states are also discussed for the case of space charge limited currents in hole transmitting layers but injection-limited currents in electron transporting layers. The results show that the recombination efficiency increases firstly and then decreases for different OOI parameters, and there is a maximum value changed with different spatial disorder parameters and energetic disorder scale. Different spatial disorder parameters make carrier mobilities change greatly, and the energetic disorder scale causes various localized state densities. Our calculated results are qualitatively in agreement with the experimental data.
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| Keywords:
78.60.Fi
78.20.-e
78.66.Qn
85.60.Jb
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Published: 01 March 2005
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| PACS: |
78.60.Fi
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(Electroluminescence)
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78.20.-e
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(Optical properties of bulk materials and thin films)
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78.66.Qn
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(Polymers; organic compounds)
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85.60.Jb
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(Light-emitting devices)
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