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Solution processed, white emitting tandem organic light-emitting diodes with inverted device architecture
Stefan Höfle1, Alexander Schienle, Christoph Bernhard
1Light Technology Institute, Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, 76131, Karlsruhe, Germany.
Advanced Materials (Deerfield Beach, Fla.)
|June 6, 2014
Summary
Solution-processed polymer OLEDs achieve multi-photon emission in tandem devices using novel charge carrier layers. These white organic light-emitting diodes (OLEDs) show promising performance for advanced lighting applications.
Area of Science:
- Materials Science
- Organic Electronics
- Photonics
Background:
- Organic Light-Emitting Diodes (OLEDs) are crucial for displays and lighting.
- Tandem OLED architectures enhance efficiency and brightness.
- Solution processing offers cost-effective manufacturing.
Purpose of the Study:
- To develop fully solution-processed monochromatic and white-light emitting tandem OLEDs.
- To investigate multi-photon emission in polymer OLEDs.
- To utilize specific charge carrier generation layers for inverted device architectures.
Main Methods:
- Fabrication of inverted tandem polymer OLEDs using solution processing.
- Employment of WO3/PEDOT:PSS/ZnO/PEI as charge carrier generation layers.
- Characterization of luminance and emission properties, including Color Rendering Index (CRI).
Main Results:
- Successful realization of monochromatic and white-light emitting tandem polymer OLEDs.
- Demonstration of additive luminance from sub-OLEDs, confirming multi-photon emission.
- White OLEDs achieved a Color Rendering Index (CRI) of 75.
Conclusions:
- Fully solution-processed tandem polymer OLEDs are feasible.
- The employed charge carrier layers effectively facilitate multi-photon emission.
- The developed white OLEDs show potential for lighting applications with acceptable color rendering.
