Mixed ligand 8-quinolinolato aluminum chelate luminophors

Claim 2

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 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.

Claim 3

A blue emitting luminescent composition according to claim 1 further characterized in that R S is a 2-position substituent of the 8-quinolinolato ring

Claim 4

A blue emitting luminescent composition according to claim 2 further characterized in that R S is an electron donating substituent.

Claim 5

A blue emitting luminescent composition according to claim 3 further characterized in that R S is chosen from the group consisting of amino, oxy and hydrocarbon groups containing up to 10 carbon atoms.

Claim 6

A blue emitting luminescent composition according to claim 4 further characterized in that R S is a hydrocarbon containing from 1 to 6 carbon atoms.

Claim 7

A blue emitting luminescent composition according to claim 1 further characterized in that the 8-quinololato ring nucleus includes a 4-position ring substituent that is electron donating.

Claim 8

A blue emitting luminescent composition according to claim 6 further characterized in that the 4-position ring substituent is chosen from among amino, oxy and hydrocarbon groups containing up to 10 carbon atoms.

Claim 9

A blue emitting luminescent composition according to claim 1 further characterized in that the 8-quinolinolato ring nucleus includes in at least one of its 5, 6 and 7 ring positions a substituent that is electron accepting.

Claim 10

A blue emitting luminescent composition according to claim 8 further characterized in that each of the 5, 6 and 7 ring position electron accepting substituents is chosen from among electron accepting cyano, halogen, and α-haloalkyl, α-haloalkoxy, amido, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing up to 10 carbon atoms.

Claim 11

A blue emitting luminescent composition according to claim 1 further characterized in that the aluminum chelate satisfies the formula: ##STR27## where R 2 represents an electron donating substituent, R 3 and R 4 each independently represent hydrogen or an electron donating substituent, R 5 , R 6 and R 7 each independently represent hydrogen or an electron accepting substituent, and L is a phenyl or aromatic fused-ring moiety which can be substituted with hydrocarbon groups such that L has from 7 to 18 carbon atoms.

Claim 12

A blue emitting luminescent composition according to claim 10 further characterized in that the electron donating substituents are independently chosen from the group consisting of --R', --OR' and --N(R")R', where R' is a hydrocarbon containing up to 6 carbon atoms and R" is hydrogen or R' and the electron accepting substituents are each independently chosen from among electron accepting cyano, halogen, and α-haloalkyl, α-haloalkoxy, amido, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing up to 6 carbon atoms.

Claim 13

A blue emitting luminescent composition according to claim 1 further characterized in that the hydrocarbon includes at least one aliphatic substituent of the phenyl moiety.

Claim 14

A blue emitting luminescent composition according to claim 12 further characterized in that the aliphatic substituent contains from 1 to 10 carbon atoms.

Claim 15

A blue emitting luminescent composition according to claim 13 further characterized in that the hydrocarbon includes at least one alkyl substituent of the phenyl moiety.

Claim 16

A blue emitting luminescent composition according to claim 13 further characterized in that the hydrocarbon includes at least two alkyl substituents of the phenyl moiety.

Claim 17

A blue emitting luminescent composition according to claim 14 further characterized in that the aliphatic substituent contains from 1 to 3 carbon atoms.

Claim 18

A blue emitting luminescent composition An internal junction organic electroluminescent device according to claim 1 further characterized in that a benzo ring is fused with the phenyl moiety.

Claim 19

A blue emitting luminescent composition according to claim 1 further characterized in that the hydrocarbon includes at least one aromatic substituent of the phenyl moiety.

Claim 20

A blue emitting luminescent composition according to claim 18 further characterized in that the aromatic substituent is comprised of a phenyl ring.

Claim 21

A blue emitting luminescent composition according to claim 1 further characterized in that the aluminum chelate satisfies the formula: ##STR28## where Q in each occurrence represents a substituted 8-quinolinolato ring nucleus, R 2 in each occurrence represents a 2-position electron donating substituent of the 8-quinolinolato ring nucleus, and L 1 , L 2 , L 3 , L 4 and L 5 collectively contain 12 or fewer carbon atoms and each independently represent hydrogen or hydrocarbon groups of from 1 to 12 carbon atoms, with the proviso that L 1 and L 2 together or L 2 and L 3 together can form a fused benzo ring.

Claim 22

A blue emitting luminescent composition according to claim 1 further characterized in that the luminescent layer additionally includes a fluorescent

Claim 23

A blue emitting luminescent composition according to claim 21 further characterized in that the fluorescent dye is chosen to provide a favored recombination site for holes and electrons and is blue emitting.

Claim 24

A blue emitting luminescent composition according to claim 22 further characterized in that the blue emitting fluorescent dye exhibits a shorter wavelength emission peak than the aluminum chelate.

Claim 25

A blue emitting luminescent composition according to claim 22 further characterized in that the blue emitting fluorescent dye contains a stabilizing aromatic chromophoric unit containing at least 5 fused carbocyclic aromatic rings.

Claim 26

A blue emitting luminescent composition according to claim 24 further characterized in that the chromophoric unit contains from 20 to 40 ring carbon atoms.

Claim 27

A blue emitting luminescent composition according to claim 25 further characterized in that the fluorescent dye chromophoric unit is chosen from among those containing a perylene, benzopyrene, benzochrysene, benzonaphthacene, picene, pentaphene, pentacene, hexacene or anthanthrene nucleus.

Claim 28

A blue emitting luminescent composition according to claim 24 further characterized in that the fluorescent dye is present in a concentration ranging from 0.05 to 5 mole percent.

Claim 29

A blue emitting luminescent composition according to claim 27 further characterized in that the fluorescent dye is present in a concentration ranging from 0.2 to 3 mole percent.

Claim 30

A blue emitting luminescent composition according to claim 27 further characterized in that the fluorescent dye is present in a concentration ranging from 0.5 to 2 mole percent.

Claim 31

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).

Claim 32

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).