Patent ID: 7230127

Claim:
A material comprising M plus a ligand wherein M is selected from Tb, Eu, Sm, Dy wherein: the material is capable of exhibiting a photoluminescent effect; and from 75% to 99.99% of M is replaced by at least one of Y, Gd, La or Lu, wherein the ligand is selected from a group consisting of: (i) Formula I: wherein: R2 is H or C1–C6 alkyl or phenyl; R1 and R3 are independently of each other selected from phenyl, naphthyl, H and C1–C6 branched or straight chain alkyl, thiophene and C1–C6 fluorinated alkyl wherein the fluorination may be in 1 or all positions or any intermediate value, substituted phenyl wherein the substituents are independently selected from C1–C4 straight or branched chain alkyl, Cl, Br, F, I and the phenyl group may be substituted in 1, 2 or 3 positions; and L is given by the following general Formula IA: wherein the arrow indicates that the oxygen coordinates to M and wherein x is 1 or 2 R4 and R5 are independently of each other selected from phenyl, tolyl, naphthyl, C1–C6 branched or straight chain alkyl and substituted phenyl wherein the substituents are independently selected from C1–C4 straight or branched chain alkyl and the phenyl group may be substituted in 1, 2 or 3 positions; R6 is selected from phenyl, tolyl, naphthyl, C1–C6 branched or straight chain alkyl, —(CH 2 ) n P(O)R7 R8, wherein n=1 to 4 and —N═(P R7 R8 R9), wherein R7, R8 and R9 are independently selected from phenyl, naphthyl, C1–C6 branched or straight chain alkyl and substituted phenyl wherein the substituents are independently selected from C1–C4 straight or branched chain alkyl and the phenyl group may be substituted in 1, 2 or 3 positions; R6 is also selected from substituted phenyl wherein the substituents are independently selected from C1–C4 straight or branched chain alkyl and the phenyl group may be substituted in 1, 2 or 3 positions; or, (ii) Formula II: wherein M is replaced by at least one of La or Lu; or, (iii) Formula III: wherein R1 and R2 and R3 are independently chosen from H, C 1 –C 12 alkyl, including straight and branched chain which may be fluorinated in one, or any interim amount and up to all positions, C 1 –C 12 cycloalkyl, aryl, thiophene, pyrrole, pyridine, pyrimidine, furan, benzoxazole, benzothiazole; X + is selected from: morpholinium; pyridinium optionally substituted by phenyl, C1–C6 alkyl, Cl, Br, F, I, CN, NO 2 ; HNR 1 R 2 R 3 wherein R 1 , R 2 and R 3 are independently selected from H, C1–C12 alkyl, phenyl and benzyl.