Bipyridine metal complexes for use as light-emitting material
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United States of America Patent
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Jan 22, 2013
Grant Date -
Jul 8, 2010
app pub date -
Jun 5, 2008
filing date -
Jun 8, 2007
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Expired
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Abstract
The present invention relates to light emitting materials comprising novel ortho-metalated transition metal complexes [C^N]2M[N^N] comprising two orthometalated ligands (C^N ligands) and a neutral bidentate bipyridine ligand (N^N). Surprisingly, it has been found that when the metal binds both orthometalated chelate C^N ligands and a neutral bidentate bipyridine ligand (N^N), these ligands participate in the emission process, thus greatly improving the red emission efficiency of complexes [C^N]2M[N^N]. The present invention further relates to the use of such light emitting materials and an organic light emitting device comprising such light emitting material.
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