Novel europium and osmium complexes for pure red light emitting diode applications |
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Authors: | Xuezhong Jiang Greg Philan Brenden Carlson Sen Liu Larry Dalton Alex K-Y Jen |
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Institution: | 1. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA;2. Department of Chemistry, University of Washington, Seattle, WA 98195, USA |
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Abstract: | Pure and efficient red light-emitting diodes based on novel europium (Eu) and osmium (Os) complexes were demonstrated. The Eu complex, with dendron substituted diketone ligands, exhibits high photoluminescence efficiency of 45%. When a copolymer containing carbazole and 1,3,4-oxadiazole groups was used as the host, narrow electroluminescence at 617 nm was achieved, with a full width at half maximum of 4 nm and a maximum external quantum efficiency (η) of 0.80%. The Os complex shows pure red emission peaking at 650 nm. The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates (x, y) are (0.65, 0.33). Maximum η and brightness achieved were 0.82% and 590 cd/m2, respectively. |
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