Characteristics of organic light emitting diodes with copper iodide as injection layer

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/Alq...

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Bibliographic Details
Published in:Thin solid films 2010-09, Vol.518 (23), p.7016-7018
Main Authors: Stakhira, P., Cherpak, V., Volynyuk, D., Ivastchyshyn, F., Hotra, Z., Tataryn, V., Luka, G.
Format: Article
Language:English
Subjects:
Alq3
Aluminum
Anodes
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Copper
Copper iodine
CuI
Dimethyl ether
Electrical properties of specific thin films
Electroluminescence
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronics
Exact sciences and technology
Glycols
Hole injection
Hole injection layer
Impedance
Indium tin oxide
Iodides
Light-emitting diodes
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optoelectronic devices
Organic light emitting device
Other luminescence and radiative recombination
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Tris-8-hydroxyquinoline aluminium
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Summary: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.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2010.06.051