Patent ID: 7242443

Claim:
A triboluminescent material comprising M wherein M is selected from Tb, Eu, Sm, or Dy and from 75% to 99.99% of M is replaced by at least one of Y, Gd, La or Lu, wherein the triboluminescent material is given by: (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; L is 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.