Efficient white light-emitting diodes realized with new processable blends of conjugated polymers
- 17 November 1997
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 71 (20), 2883-2885
- https://doi.org/10.1063/1.120205
Abstract
An alternative method for producing efficient white light-emitting polymer diodes based on a blend of two polymers is reported. The white light emission is composed of a broad blue emission of laddertype (polyparaphenylene) -LPPP) and a red-orange emission of a new polymer, poly(perylene-co-diethynylbenzene) (PPDB). The red-orange electroluminescence emission is promoted by an excitation energy and charge transfer from -LPPP to the PPDB. A concentration of 0.05% PPDB in the polymer blend is required in order to obtain white light emission. By inserting an insulating material in the blend, so that a maximum external quantum efficiency of 1.2% is obtained.
Keywords
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