WHITE-LIGHT-EMITTING ELEMENT

• Main Authors: AKINO YOSHIHIKO, MAYUMI MIHO, SEKINE CHIZU
• Format: Patent
• Language: English
• Published: 24.11.2011
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; 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; POLISHES; SEMICONDUCTOR DEVICES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

PROBLEM TO BE SOLVED: To provide a white-light-emitting element excellent in practical utility.SOLUTION: A white-light-emitting element has, between electrodes comprising positive and negative electrodes, a layer that contains a composition containing a fluorescence conjugated system polymer (A) and a phosphorescence compound (B) or includes a polymeric material containing a polymer having a structure of the fluorescence conjugated system polymer (A) and a structure of the phosphorescence compound (B) in the same molecule, and the polymeric material satisfies following conditions of (1), (2), and (3). (1) At least one of emission peak wavelengths of the fluorescence conjugated system polymer (A) is less than 500 nm. (2) The emission peak wavelength of the phosphorescence compound (B) is 500 nm or more. (3) The relation represented by the following equation establishes: ET-ES≥(ET-ES)-0.2 (unit: eV), where ESis an energy of the ground state of the polymer (A), ETis an energy of the lowest excited triplet state of the polymer (A), ESis an energy of the ground state of the compound (B), and ETis an energy of the lowest excited triplet state of the compound (B).