Patent ID: 7402343

Claim:
A photoluminescence quenching device comprising a chemical compound, comprising: an electron donor group at one end of the chemical compound, the electron donor group is selected from the group consisting of carbazole, thiophene, compounds of formulas 1a through 1d, thiophene, and oligomers thereof: an electron acceptor group at the other end of the chemical compound, the electron acceptor group selected from the group consisting of monosubstituted phenyl, disubstituted phenyl, trisubstituted phenyl, imide and anhydride of aromatic polycarboxylic acid, oxazole, a fused cyclic system, a compound having a chemical basic structure selected from the group consisting of a fluorine-substituted phenyl group, a nitro-substituted phenyl group, a cyano-substituted phenyl group, imide and anhydride of perylenetetracarboxylic acid and a substituted compound thereof, imide and anhydride of naphthalenetetracarboxylic acid and a substituted compound thereof, oxadiazole and a substituted compound thereof, oxazole and a substituted compound thereof, and a fluorenylidene moiety and a substituted compound thereof, and the following compounds of formulas 3a through 3m; a conjugated bridging element, said electron donor group and said electron acceptor group linked to each other via said conjugated bridging element, wherein said chemical compound has a readily displaceable electron, a dipole character is present only in the excited state, and said chemical compound is capable of emitting photoluminescent radiation, and the photoluminescent quenching device generates photoluminescent light by using exterior light and is capable of auto-emitting photoluminescent light when light is sparse or absent.