Inherent interference-filter polymer light-emitting diodes


  • The authors thank members of the EO Group at the Cavendish Laboratory, University of Cambridge, UK, for detailed discussions of the effects reported here. Specific support for PB in Linkoping was supplied by the Wallenberg Foundation Fundl in a grant for Cooperation with the Countries of Central Europe. In general, research on conjugated polymers in Linköping is supported by grants from the Swedish Natural Sciences Research Council (NFR). the Swedish Research Council for Engineering Sciences (TFR), the Swedish National Board for Industrial and Technical Development (NUTEK), Philips Research, NL (within Brite/EURAM PolyLED, 0592), Hoechst AG, FRG, and by the Commission of the European Union, within the ESPRIT program (project 8013, LEDFOS), and the Human Capital and Mobility program (project 0669, PANET) and the Mobility and Training of Researchers program (project number 1354, SELOA). In addition, this work was partly supported by the Polish State Committee for Scientific Research through grant No. 3P40505707.


A global or “systems” approach to the design of polymer-based light-emitting devices is shown to be important for an understanding of the details of light emission from these devices. A self-interference-filter type of light-emitting device with a very narrow spectral output–a prerequires for many applications but difficult to realize because of the typically broad electroluminescence emission spectrum–is described, in which color selection is achieved by the appropriate combination of layer thickness and values of refractive index of the components of the device structure.