The authors thank M. Flämmich (Fraunhofer IOF, Jena) for the optical characterization of the white-emitting polymer and Dr. D. Hertel for support with the temperature-resolved measurements. The authors also thank Dr. A. Ludemann for the synthesis of the polymers and Dr. S. Heun (both Merck KGaA) for useful discussion. The authors acknowledge financial support from the Bundesministerium für Bildung und Forschung (BMBF) through the Hobbit project (13N8952).
On the Origin of the Color Shift in White-Emitting OLEDs†
Article first published online: 28 NOV 2007
Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 19, Issue 24, pages 4460–4465, December, 2007
How to Cite
Gather, M. C., Alle, R., Becker, H. and Meerholz, K. (2007), On the Origin of the Color Shift in White-Emitting OLEDs. Adv. Mater., 19: 4460–4465. doi: 10.1002/adma.200701673
- Issue published online: 11 DEC 2007
- Article first published online: 28 NOV 2007
- Manuscript Revised: 2 AUG 2007
- Manuscript Received: 10 JUL 2007
- Bundesministerium für Bildung und Forschung (BMBF) through the Hobbit project. Grant Number: 13N8952
- Charge Transport;
- Light-Emitting Diodes;
- White-Light Emitters
White-emitting organic light-emitting diodes (OLEDs) notoriously suffer from brightness-dependent color shifts. Based on experimental data and fundamental considerations about charge-transport and trapping, a quantitative model is developed which gives insight into the origin of this shift and describes the experimental data extremely well. Having understood the major contribution to the spectral instability, a device architecture is designed that shows excellent color stability over a wide range of brightness levels.