Patent ID: 7232616

Claim:
A compound of the formula: (L 2 L 3 M) n ; wherein; M is a trivalent metal selected from the group consisting of Al, Ga, In and Tl; n is 2; L 2 is a bidentate ligand, comprising one oxygen atom and one nitrogen atom to coordinate the central ion, selected from the group consisting of unsubstituted 8-hydroxyquinoline; unsubstituted 2-(o-hydroxyphenyl)-benzoxazole; unsubstituted 4-hydroxy-1,5-naphthyridine; unsubstituted 5-hydroxyquinoxaline; unsubstituted 2-(o-hydroxylphenyl)-benzimidazole; unsubstituted 2-(o-hydroxylphenyl)-benzothiazole; unsubstituted 10-hydroxyl-benzoquinoline; unsubstituted 2-carboxyl-pyridine; substituted 8-hydroxyquinoline; substituted 2-(o-hydroxyphenyl)-benzoxazole; substituted 4-hydroxy-1,5-naphthyridine; substituted 5-hydroxyquinoxaline; substituted 2-(o-hydroxylphenyl)-benzimidazole; substituted 2-(o-hydroxylphenyl)-benzothiazole; substituted 10-hydroxyl-benzoquinoline; substituted 2-carboxyl-pyridine; and substituent groups include alkyl groups having 1–8 carbon atoms, groups having at least one halogen atom, cyano groups, amino groups, amido groups, sulfonyl groups, carbonyl groups, aryl groups, and heteroalkyl groups; and L 3 is a tridentate ligand with three chelate points and has the formula in which X and Y independently represent one of CH and N; and II and III are selected from the group consisting of unsubstituted aryl groups, unsubstituted heteroalkyl groups, substituted aryl groups, and substituted heteroalkyl groups.