Efficient multilayer organic light emitting diode |
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| Affiliation: | 1. Department of Physics and Astronomy, University of Louisville, Louisville 40292, KY, United States;2. Department of Materials Science & Engineering, Iowa State University, Ames 50011, IA, United States;3. Department of Chemical Engineering, University of Louisville, Louisville 40292, KY, United States;4. Conn Center for Renewable Energy Research, University of Louisville, Louisville 40292, KY, United States;5. Electro-Optics Research Institute & Nanotechnology Center, University of Louisville, Louisville 40292, KY, United States |
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| Abstract: | Some organic light emitting diodes with Alq3 as emission layer, multilayer composed of m-MTDATA, NPB, TPD or SA as hole transport layer and lithium doped Alq3 as electron injection assistant layer have been investigated. The current voltage characteristics and the electroluminescent (EL) output voltage characteristics have been investigated. It is found that the m-MTDATA is suitable as a hole injection layer close to the hole injection electrode ITO, NPB is suitable in contact with the emission layer, SA and TPD can be inserted between them to form an energy ladder structure, with which the efficiency of device has been increased. When thin lithium doped Alq3 layer is inserted between Alq3 and the aluminium electrode, the driving voltage of the devices has been clearly decreased while the current density and the EL output increased. |
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