High Efficiency Composite Metal Oxide-Polymer Electroluminescent Devices: A Morphological and Material Based Investigation


  • B. W. acknowledges the Swiss National Science Foundation for funding. HJS acknowledges Clare College Cambridge and the RCUK for funding. D. K. and M. Y. S. acknowledge EPSRC for funding. We also thank Pascal Comte and Michael Grätzel from EPFL for supplying the titania particle paste.


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Composite metaloxide polymer based electroluminescent diodes are designed to obtain air stable operation along with sub-volt turn on and high brightness. We investigate different structures (mesoporous and compact) and different materials (TiO2 and ZnO) for electron injecting layers, and employ MoO3 for hole injecting layers. The highest efficiencies, close to 3 Cd A−1, are achieved using compact ZnO.