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Influence of the excitation voltage on the electroluminescence of PVK-based Polymer Light Emitting Diodes with different electrochemically-deposited PANI buffer layers

J. L. ALONSO1,* , J. C. FERRER1, S. FERNÁNDEZ DE ÁVILA1

Affiliation

  1. Dpto. de Física y Arquitectura de Computadores, Universidad Miguel Hernández, Av. de la Universidad s/n, Ed. Torrepinet, 03202, Elche, Alicante, Spain

Abstract

Polymeric light emitting diodes based on Poly(9-vinylcarbazole) have been fabricated. Electrochemically deposited polyaniline (PANI) films of several thicknesses have been used onto the ITO-covered glass substrates as buffer layers. An experimental study about the dependence of the Electroluminescence on the excitation voltage of these devices with different thicknesses of PANI buffer layers has been carried out. A comparison has been established with devices with PEDOT:PSS buffer or without any buffer layer. A lower turn-on voltage has been found for devices using thicker PANI buffer layer. Electroluminescence measurements suggest that the energy emitted varies exponentially with the excitation voltage of the devices. A demonstration has been done by calculating the area under the electroluminescence curves and fitting the results as a function of the excitation voltage..

Keywords

Polymeric light-emitting diodes, Polyaniline, Hole-transporting layers, Electrochemically-deposited, Spin-coating, Electroluminescence.

Submitted at: April 10, 2008
Accepted at: Nov. 11, 2008

Citation

J. L. ALONSO, J. C. FERRER, S. FERNÁNDEZ DE ÁVILA, Influence of the excitation voltage on the electroluminescence of PVK-based Polymer Light Emitting Diodes with different electrochemically-deposited PANI buffer layers, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 3150-3157 (2008)