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Sunlight stability of organic light emitting diodes

Heil, Holger and Andress, G. and Schmechel, Roland and Seggern, Heinz von and Steiger, Jürgen and Bonrad, K. and Spengard, R. (2005):
Sunlight stability of organic light emitting diodes.
In: Journal of applied physics, 97 (12), pp. 124501-1-124501-4, ISSN 0021-8979,
[Online-Edition: http://dx.doi.org/10.1063/1.1935130],
[Article]

Abstract

This paper reports on the photodegradation of organic light-emitting diodes (OLEDs) due to exposure to visible and near-ultraviolet light. Such exposure affects strongly the device performance, e.g., the electroluminescence intensity and the device current decrease considerably, however, the photoluminescence remains unaffected. This photodegradation was investigated on various production-relevant classes of high-quality polymer semiconductors with different energy gaps, i.e., a yellowish-green polyphenylenevinylene derivative, a red polyfluorene derivative, and a blue polyspiro derivative. It will be demonstrated that the action spectrum of the photodegradation is strongly correlated with the fundamental absorption of the polymer itself. The indium-doped tin oxide (ITO) polymer interface was identified as the interface where photodegradation takes place, while the bulk of each layer (ITO or polymer) turned out to be insensitive to irradiation with visible or near-ultraviolet light. Furthermore, it is demonstrated that the photoinduced damage can be suppressed by inserting appropriate interlayer systems.

Item Type: Article
Erschienen: 2005
Creators: Heil, Holger and Andress, G. and Schmechel, Roland and Seggern, Heinz von and Steiger, Jürgen and Bonrad, K. and Spengard, R.
Title: Sunlight stability of organic light emitting diodes
Language: English
Abstract:

This paper reports on the photodegradation of organic light-emitting diodes (OLEDs) due to exposure to visible and near-ultraviolet light. Such exposure affects strongly the device performance, e.g., the electroluminescence intensity and the device current decrease considerably, however, the photoluminescence remains unaffected. This photodegradation was investigated on various production-relevant classes of high-quality polymer semiconductors with different energy gaps, i.e., a yellowish-green polyphenylenevinylene derivative, a red polyfluorene derivative, and a blue polyspiro derivative. It will be demonstrated that the action spectrum of the photodegradation is strongly correlated with the fundamental absorption of the polymer itself. The indium-doped tin oxide (ITO) polymer interface was identified as the interface where photodegradation takes place, while the bulk of each layer (ITO or polymer) turned out to be insensitive to irradiation with visible or near-ultraviolet light. Furthermore, it is demonstrated that the photoinduced damage can be suppressed by inserting appropriate interlayer systems.

Journal or Publication Title: Journal of applied physics
Volume: 97
Number: 12
Uncontrolled Keywords: indium compounds, organic semiconductors, polymers, organic light emitting diodes, electroluminescence, photoluminescence, energy gap, ultraviolet radiation effects
Divisions: 11 Department of Materials and Earth Sciences
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D4: Fatigue of organic electronic devices
Date Deposited: 20 Nov 2008 08:24
Official URL: http://dx.doi.org/10.1063/1.1935130
Additional Information:

SFB 595 D4

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