Atomic layer deposited zirconium oxide electron injection layer for efficient organic light emitting diodes |
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| Authors: | Maria Vasilopoulou Stella Kennou Spyridon Ladas Stavroula N Georga Martha Botzakaki Dimitrios Skarlatos Christoforos A Krontiras Nikolaos A Stathopoulos Panagiotis Argitis Leonidas C Palilis |
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| Affiliation: | 1. Institute of Microelectronics, NCSR Demokritos, Terma Patriarchou Grigoriou, 15310 Aghia Paraskevi, Greece;2. Department of Chemical Engineering, University of Patras, 26500 Patras, Greece;3. Department of Physics, University of Patras, 26500 Patras, Greece;4. Department of Electronics, Technological and Educational Institute of Pireaus, 12244 Aegaleo, Greece |
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| Abstract: | In this work, we demonstrate efficient polyfluorene-based light emitting diodes on which conformal, thin ZrO2 layers, formed by atomic layer deposition at a relatively low temperature (175 °C), in order to avoid introducing any damage in the organic under layer, efficiently inject electrons from their high lying conduction band to the polymer’s LUMO. An optimal thickness of 2 nm for ZrO2 results in a threefold improvement in luminous current efficiency compared to the reference device. The relationship between the thickness of the ZrO2 layer and the device operational characteristics is further investigated and the possible reasons for the improved device performance are discussed based on the experimental results obtained by a combination of photoemission spectroscopy and electrical/optical measurements. |
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