Mixed ligand 8-quinolinolato aluminum chelate luminophors
AssigneeEastman Kodak Company
InventorsPhilip S. Bryan, Frank V. Lovecchio, Steven A. VanSlyke
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Abstract
A blue-emitting luminescent composition is disclosed comprised of an aluminum chelate containing a phenolato ligand and two R.sup.s -8-quinolinolato ligands, where R.sup.s substituents are chosen to block the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom. The presence of the phenolato ligand shifts emission to the blue region of the spectrum. Emission can be shifted to even shorter blue wavelengths by the incorporation of a pentacarbocyclic aromatic fluorescent dye.
Claims30
A blue emitting luminescent composition comprised of an aluminum chelate of the formula:
- (R.sup.S --Q).sub.2 --Al--O--L
- where
- Q in each occurrence represents a substituted 8-quinolinolato ligand,
- R.sup.S represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ligands to the aluminum atom, and
- L is a phenyl or aromatic fused-ring moiety which can be substituted with hydrocarbon groups such that L has from 6 to 24 carbon atoms.
A blue emitting luminescent composition comprised of an aluminum chelate chosen from the group consisting of
- bis(2-methyl-8-quinolinato)(phenolato)-aluminum(III);
- bis(2-methyl-8-quinolinato)(ortho-cresolato)-aluminumn(III);
- bis(2-methyl-8-quinolinato)(meta-cresolato)-aluminum(III);
- bis(2-methyl-8-quinolinato)(para-cresolato)-aluminum(III);
- bis(2-methyl-8-quinolinato)(ortho-phenylphenolato)-aluminum(III);
- bis(2-methyl-8-quinolinato)(meta-phenylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(para-phenylphenolato)-aluminum(III);
- bis(2-methyl-8-quinolinato)(2,3-dimethylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(2,6-dimethylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(3,4-dimethylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(3,5-dimethylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(3,5-di-tert.-butylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(2,6-diphenylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(2,4,6-tri-phenylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(2,3,6-tri-methylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(2,3,5,6-tetramethylphenolato)aluminum(III);
- bis(2-methyl-8-quinolinato)(1-naphtholato)aluminum(III);
- bis(2-methyl-8-quinolinato)(2-naphtholato)aluminum(III);
- bis(2,4-dimethyl-8-quinolinato)(ortho-phenylphenolato)aluminum(III);
- bis(2,4-dimethyl-8-quinolinato)(para-phenylphenolato)aluminum(III);
- bis(2,4-dimethyl-8-quinolinato)(meta-phenylphenolato)aluminum(III);
- bis(2,4-dimethyl-8-quinolinato)(3,5-dimethylphenolato)aluminum(III);
- and
- bis(2,4-dimethyl-8-quinolinato)(3,5-di-tert-butylphenolato)aluminum(III).
Dependencies are inferred from the claim text.