Enhancement of the light extraction efficiency in organic light emitting diodes utilizing a porous alumina film

The light extraction efficiencies of organic light emitting diodes (OLEDs) utilizing various kinds of porous alumina films with different pore diameters were investigated. The OLEDs with the porous alumina film deposited on the glass surface were fabricated to improve their light extraction efficien...

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Bibliographic Details
Published in:Thin solid films 2008-04, Vol.516 (11), p.3633-3636
Main Authors: Kim, K.P., Lee, K.S., Kim, T.W., Woo, D.H., Kim, J.H., Seo, J.H., Kim, Y.K.
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Light extraction efficiency
Luminance efficiency
Materials
OLED
Optoelectronic devices
Porous alumina film
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:The light extraction efficiencies of organic light emitting diodes (OLEDs) utilizing various kinds of porous alumina films with different pore diameters were investigated. The OLEDs with the porous alumina film deposited on the glass surface were fabricated to improve their light extraction efficiency. The porous alumina film was fabricated by using a two step anodizing electrochemical procedure. The current densities as functions of the applied voltage do not significantly change, regardless of the existence and the magnitude of the pore diameter in the porous alumina film. The luminance efficiency of the OLEDs increased with increasing pore diameter. The luminance efficiency of the OLEDs utilizing the porous alumina film with a pore diameter of 70 nm was enhanced approximately 9% in comparison with that of the OLEDs without the porous alumina film. These results indicate that highly efficient OLEDs can be fabricated using a porous alumina film with an optimum pore diameter.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2007.08.031