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Optical Properties of Alq3/TiO2 BDR Structure Processed by Spin Coating Technique

Published online by Cambridge University Press:  14 January 2019

L. Ajith DeSilva,
Sarahn Nazaret,
A. G. U. Perera and
T. M. W. J. Bandara
L. Ajith DeSilva*
Affiliation:
Department of Physics, University of West Georgia, Carrollton, GA30118, USADepartment of Physics and Astronomy, Georgia State University, Atlanta, GA30303USA
Sarahn Nazaret
Affiliation:
Department of Physics, University of West Georgia, Carrollton, GA30118, USA
A. G. U. Perera
Affiliation:
Department of Physics and Astronomy, Georgia State University, Atlanta, GA30303USA
T. M. W. J. Bandara
Affiliation:
Department of Physics, University of Peradeniya, Peradeniya, Sri Lanka
*
*corresponding author: ldesilva@westga.edu
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Abstract

One-dimensional hybrid Distributed Bragg Reflector (DBR) is constructed using Tris (8-hydroxy) quinoline aluminum (Alq3) molecules and Titanium dioxide (TiO2) nanoparticles via spin coating process. Light emission from thin films of low molecular weight organic semiconductor of Alq3 is dominated by excitons. This material has been widely used as a superior emitter for organic light emitting diodes. Titanium dioxide (TiO2) is an inorganic semiconductor with a high band gap. Photoluminescence (PL) of thin films of Alq3 showed a broad PL peak at 530 nm. In DBR structures, PL quenching is observed but there is no shift in the PL peak of the Alq3. The PL quenching is tentatively attributed to energy transfer via sensitization to wide band gap TiO2 layers. A simple excitonic model is suggested to explain the observation. Fabrication process and optical properties of the structure are presented.

Keywords

devicesoptical propertiesorganicphotonic

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Type
Articles
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MRS Advances , Volume 4 , Issue 11-12: Electronic, Photonic and Magnetic Materials , 2019, pp. 661 - 666
Copyright
Copyright © Materials Research Society 2019 

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References

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