Luminescent material and luminescent element comprising the same

• Main Authors: CHIZU SEKINE, SATOSHI MIKAMI, NABUHIKO AKINO
• Format: Patent
• Language: English
• Published: 02.08.2006
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

A luminescent material which comprises (A) a conjugated polymer having an aromatic ring in the main chain and (B) a compound which luminesces in a triplet exited state, characterized in that in the polymer (A), the difference in energy between the vacuum level and the lowest unoccupied molecular orbital (LUMO) level in the ground state each calculated by an arithmetic chemical technique is 1.3 eV or the difference in energy between the vacuum level and the lowest unoccupied molecular orbital (LUMO) level in the ground state each measured experimentally is 2.2 eV or larger, and that the material satisfies the following requirement (1): Requirement (1) ETA - ESAO > ETB - ESBO wherein ESAO is the energy of the polymer (A) in the ground state; ETA is the energy of the polymer (A) in the minimum excited triplet state; ESBO is the energy of the compound (B) in the ground state; and ETB is the energy of the compound (B) in the minimum excited triplet state.