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AssigneeThe Regents of the University of California
InventorsXiong Gong, Alan J. Heeger, Daniel Moses, Guillermo C. Bazan, Shu Wang
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Multilayer polymer light-emitting diodes (PLEDs) are demonstrated using semiconducting polymers blended with organometallic emitters as the emissive layer and one or both of an electron transport layer and a hole transparent layer on the appropriate electron injection and hole injection sides of the emissive layer. The transport layers reduce energy potential gaps between the hole injection electrode and the emissive polymer and between the electron injection electrode and the emissive polymer. A solvent-processing based procedure for preparing these devices is also disclosed It uses nonpolar solvent-based solutions of emissive polymers to form the emissive layer and polar solvent-based solutions to form the transport layers to minimize etching and other undesirable interactions as the multiple layers are being laid down. Illumination quality white light can be obtained with stable Commission Internationale de l'Eclairage coordinates, stable color temperatures, and stable color rendering indices, all close to those of “pure” white light. These multilayer white light-emitting PLEDs are useful as backlights for liquid crystal displays and for solid state lighting applications.
In an organic polymer-based light-emitting device comprising an electron injection electrode and a hole injection electrode on opposite sides of an emissive layer, the emissive layer comprising at least one luminescent first semiconducting polymer capable of fluorescent emission serving as host to at least one admixed phosphorescent emitter capable of phosphorescent emission, the improvement comprising at least one of:
A multilayer organic polymer-based light-emitting device comprising in layer order one to another:
The A multilayer organic polymer-based light-emitting device comprising in layer order one to another:
In an organic polymer-based white light-emitting device comprising an electron injection electrode and a hole injection electrode on opposite sides of an emissive layer, the emissive layer comprising at least one luminescent first semiconducting polymer capable of fluorescent emission serving as host to at least one admixed phosphorescent emitter capable of phosphorescent emission, wherein the device, at J=200 mA/cm2, L equal to at least about 10000 cd/m2, LEext equal to at least about 10 cd/A and PEext equal to at least about 2 lm/W.
In an organic polymer-based light-emitting device comprising an electron-injection layer and a hole-injection layer on opposite sides of an emissive layer, the emissive layer comprising at least one luminescent first semiconducting polymer capable of fluorescent emission serving as host to at least one admixed phosphorescent emitter capable of phosphorescent emission, the improvement comprising at least one of an organic electron transport layer comprising a second semiconducting polymer disposed between the electron injection layer and the emissive layer and having a lowest unoccupied molecular orbital close in energy to the bottom of the Π band of the luminescent polymer an organic hole transport layer comprising a third semiconducting polymer disposed between the hole injection layer and the emissive layer and having a highest occupied molecular orbital close in energy to the top Π band of the luminescent first semiconducting polymer, said first semiconducting polymer being differentially soluble in a first solvent and at least one of said second and third semiconducting polymers being differentially soluble in a second solvent, said first and second solvents differing in polarity from one another.
Dependencies are inferred from the claim text.