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Characteristics of organic light emitting diodes with copper iodide as injection layer |
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| Authors: | P. Stakhira V. Cherpak F. Ivastchyshyn V. Tataryn |
| Affiliation: | a Lviv Polytechnic National University, S. Bandera, 12, Lviv, 79013, Ukraine b Rzeszów University of Technology, W. Pola 2, Rzeszów, 35-959, Poland c Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland |
| Abstract: | We have studied the use of a thin copper iodide (CuI) film as an efficient injection layer of holes from indium tin oxide (ITO) anode in a light-emitting diode structure based on tris-8-hydroxyquinoline aluminium (Alq3). The results of impedance analysis of two types of diode structures, ITO/CuI/Alq3/poly(ethylene glycol) dimethyl ether/Al and ITO/Alq3/poly(ethylene glycol) dimethyl ether/Al, are presented. Comparative analysis of their current density-voltage, luminance-voltage and impedance characteristics shows that presence of CuI layer facilitates injection of holes from ITO anode into the light-emitting layer Alq3 and increases electroluminescence efficiency of the organic light emitting diodes. |
| Keywords: | Organic light emitting device Hole injection Copper iodine Hole injection layer Alq3 CuI Tris-8-hydroxyquinoline aluminium |
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