Patent ID: 7955861

Claim:
A luminescent dye compound having formula I: wherein R 1 and R 2 are independently phenyl or naphthy; R 1 and R 2 are optionally independently substituted with 1, 2, or 3 substituent groups; where the substituent groups are halo, hydroxyl, methyl, methoxy, —O—CH 2 —O CH 3 or —NC(═O)CH 3 ; or two substituent groups can form a ring together with the atom to which they are attached optionally having 5 ring atoms and optionally having 1 heteroatom; Y 1 is Al or B; X 1 and X 2 are independently a bond, or —CH═CH—, R 3 and R 4 are independently, halo, hydroxyl, R 15 O(C 1 -C 12 )alkyl, or —OR 15 ; or R 3 and R 4 taken together form a bidentate chelate, or R 3 and R 4 taken together with the boron atom form a ring having the formula: R 5 is hydrogen, or R 5 and the carbon to which it is attached have the formula: each Q is independently a non-toxic pharmaceutically acceptable, biologically stable or biodegradable polymer.