Abstract: A pulsed-driven device, such as a display, comprises an organic light-emitting composition comprising a host material and a blended or bound phosphorescent emitter. The phosphorescent emitter is present in the host material at a concentration of greater than 10 wt. %, and the host material has a higher triplet energy level than the phosphorescent emitter. The concentration at which the phosphorescent emitter is at peak efficiency in the host material is greater than 10 wt. %, and the composition does not include a fluorescent emitter, so that emission from the composition in use is substantially all phosphorescence.

Abstract: Disclased is a polymeric compound having a constitutional unit represented by formula (1a), wherein ring A and ring B independently represent an aromatic hydrocarbon ring which may have a substituent; R1 represents a group represented by formula (2); and R2 represents an aryl group or a monovalent aromatic heterocyclic group which may be substituted by an alkyl group or the like. In formula (2), Ar1 to Ar3 independently represent an arylene group or a divalent group to which two or more arylene groups are attached via a single bond; Ar4 to Ar7 independently represent an aryl group or a monovalent aromatic heterocyclic group; R6 represents a hydrogen atom, an alkyl group, an aryl group or a monovalent aromatic heterocyclic group; Ar1 to Ar7 and R6 may be substituted by an alkyl group or the like; and k and kk independently represent an integer of 0 to 3, provided that at least one of k and kk represents an integer of 1 to 3.

Abstract: High quantum yield luminescent monomers, oligomers, and polymers, comprising benzotriazole repeating units and derivatives thereof have been discovered and utilized in optical devices and components therefor, including electroluminescent devices, light emitting devices, photoluminescent devices, organic light emitting diodes (OLEDs), OLED displays, sensors, and the like.

Abstract: An organic electroluminescent device excellent in light emission efficiency and driving voltage, having electrodes composed of an anode and a cathode, a first organic layer arranged in contact with or adjacent to the anode between the electrodes and containing a hole transporting polymer compound and a second organic layer arranged in contact with the first organic layer between the first organic layer and the cathode and containing an electron transporting polymer compound, wherein the hole transporting polymer compound and the electron transporting polymer compound are regulated by specific parameters, at least one of the first organic layer and the second organic layer contains a light emitting material regulated by specific parameters, and light of specific color is emitted from the first organic layer or from the first organic layer or the second organic layer.