Objective As a result of the PolyLED project the following has been achieved by the partners: A range of soluble conjugated polymers and soluble precursor polymers, model systems and non-conjugated sidechain polymers with well documented syntheses and characterization methods for these materials. A standard device geometry and a procedure to test these devices has been designed and implemented to allow comparison of materials and procedures between the partners. Well documented procedures to fabricate electroluminescent devices, as a signal pixel or as an array of pixels in a display and their characterization, both optically and electronically. Also special effects have been observed, eg polarized emission from devices with oriented polymer layers. Models have been generated, based on the study of our devices, that describe the mechanism of injection of the charge carriers and their recombination. Various demonstrator devices were presented, a 5x7 display and iconized displays, in various colours. We have also assembled the driving electronics for these devices. A procedure to prepare one of our materials, a soluble dialkoxy-substituted PPV, as well as some options to prepare PolyLED devices on a large scale, as a first step to device manufacturing technology. More quantitatively the results are: Polymer materials that allow fabrication of PolyLED devices with an external quantum efficiency of more than 2% Electroluminescent intensity of PolyLED devices well over 100 Cd/m{2}, with peak brightness over 10.000 Cd/m{2} A durability of the devices, at 100 Cd/m{2}, of over 1000 hrs Electroluminescent intensities of over 100 Cd/m{2} at voltages of less than 4 V All colours, red, green, blue, are availableIt is proposed to develop new light-emitting diodes and displays, based on new organic semiconducting polymers. A number of polymeric materials have been shown to be suitable candidates for the application as organic semiconducting materials in light-emitting diodes, but improvements are necessary to fulfil the requirements of larger scale use. If these new polymer materials are available, new polymer light-emitting diodes and displays of completely new design will be available, which are easier and cheaper to make, using simpler and safer technologies and which will be more versatile in their application. These devices will be lightweight, can be made flexible and can have large electroluminescent areas. The principle Tasks to achieve this are:- Synthesis of new materials for electroluminescence in the red, green and blue. - Processing of the various electroluminescent materials into thin films. - Development of technology to make polymer light-emitting diodes and displays. - Examination of device operation characteristics of light-emitting diodes and displays. - Development of technologies for larger scale production.At the end of the project three demonstrators are scheduled, a pixelated alpha-numeric display, a blue light-emitting diode and a flexible display. Fields of science engineering and technologymaterials engineeringcolorsnatural scienceschemical sciencespolymer sciencesengineering and technologymaterials engineeringcoating and filmsnatural sciencesmathematicspure mathematicsgeometry Programme(s) FP3-BRITE/EURAM 2 - Specific programme (EEC) of research and technological development in the field of industrial and materials technologies, 1990-1994 Topic(s) 1.4.4 - Optical materials Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator Philips BV EU contribution No data Address Prof Holstlaan 4 5656 AA Eindhoven Netherlands See on map Total cost No data Participants (4) Sort alphabetically Sort by EU Contribution Expand all Collapse all HOECHST AG Germany EU contribution No data Address 6230 FRANKFURT AM MAIN See on map Total cost No data MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V. Germany EU contribution No data Address Ackermannweg 10 55021 MAINZ See on map Total cost No data THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE United Kingdom EU contribution No data Address Cavendish Laboratory, Madingley Road CB3 0HE CAMBRIDGE See on map Total cost No data Thomson-CSF France EU contribution No data Address Domaine de Corbeville 91404 Orsay Cedex See on map Total cost No data
