Luminescent material and luminescent element comprising the same

• Main Author: SEKINE CHIZU,AKINO NABUHIKO,MIKAMI SATOSHI
• Format: Patent
• Language: English
• Published: 18.10.2006
• 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 light emitting material comprising a conjugated polymer compound (A) containing an aromatic ring in the main chain and a compound (B) showing light emission from the triplet excited state, wherein an energy difference between the vacuum level and the lowest unoccupied orbital (LUMO) level in the ground state, calculated by a computational chemical means, is 1.3 eV or more, or an energy difference between the vacuum level and the lowest unoccupied orbital (LUMO) level in the ground state, experimentally measured, is 2.2 eV or more, in the polymer compound (A), and either the following (Condition 1) or the following (Condition 2) or both of them are satisfied. (Condition 1): Energy (ESA0) in the ground state of the polymer compound (A), energy (ETA) in the lowest excited triplet state of the polymer compound (A), energy (ESB0) in the ground state of the compound (B) and energy (ETB) in the lowest excited triplet state of the compound (B) satisfy the relation (Eq 1 ): ETA-ESA0>ETB-ESB0 (Eq1) (Condition 2): The ratio PLA/PLB of photoluminescence intensity (PLA) of the polymer compound (A) to photoluminescence intensity (PLB) of the compound (B) showing light emission from the triplet excited state is 0.8 or less.