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Optical Interference as a Tool to Describe the Spectral Changes Created by a Tunable and Controllable Excitons Confinement

Published online by Cambridge University Press:  01 February 2011

Christophe Féry ,
Salvatore Ciná ,
Henri Doyeux ,
Bernard Geffroy ,
Christine Denis  and
Pascal Maisse
Christophe Féry
Affiliation:
Thomson R&D France 1, Avenue Belle Fontaine – CS 17616 35576 Cesson-Sévigné – France CEA/DRT/LITEN/DSEN/GENEC/L2C CEA/Saclay, 91191 GIF SUR YVETTE CEDEX, France
Salvatore Ciná
Affiliation:
Thomson R&D France 1, Avenue Belle Fontaine – CS 17616 35576 Cesson-Sévigné – France CEA/DRT/LITEN/DSEN/GENEC/L2C CEA/Saclay, 91191 GIF SUR YVETTE CEDEX, France
Henri Doyeux
Affiliation:
Thomson R&D France 1, Avenue Belle Fontaine – CS 17616 35576 Cesson-Sévigné – France CEA/DRT/LITEN/DSEN/GENEC/L2C CEA/Saclay, 91191 GIF SUR YVETTE CEDEX, France
Bernard Geffroy
Affiliation:
Thomson R&D France 1, Avenue Belle Fontaine – CS 17616 35576 Cesson-Sévigné – France CEA/DRT/LITEN/DSEN/GENEC/L2C CEA/Saclay, 91191 GIF SUR YVETTE CEDEX, France
Christine Denis
Affiliation:
Thomson R&D France 1, Avenue Belle Fontaine – CS 17616 35576 Cesson-Sévigné – France CEA/DRT/LITEN/DSEN/GENEC/L2C CEA/Saclay, 91191 GIF SUR YVETTE CEDEX, France
Pascal Maisse
Affiliation:
Thomson R&D France 1, Avenue Belle Fontaine – CS 17616 35576 Cesson-Sévigné – France CEA/DRT/LITEN/DSEN/GENEC/L2C CEA/Saclay, 91191 GIF SUR YVETTE CEDEX, France
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Abstract

In this paper we address the optical process occurring in a standard Alq3 based OLED device using a classical electromagnetic framework. A comprehensive comparison with experimental results is made with an excellent agreement. The insertion of a hole blocking layer (HBL) is used to confine excitons formation and relaxation within a well defined region allowing us to separate optical effects from other mechanisms. By tuning the cavity thickness, we can demonstrate destructive interference into the wavelength region corresponding to Alq3 peak emission. Electroluminescence measurements in an integrating sphere further supports the idea that the interferences scheme used here describes well the optical behaviour of our samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 871: Symposium I – Organic Thin-Film Electronics , 2005 , I9.13
Copyright
Copyright © Materials Research Society 2005

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