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85results about How to "Increase hole injection" patented technology

White organic light emitting device

A white organic light emitting device includes: an anode formed on a substrate; a first emissive layer, in which a first sub-emissive layer and a second sub-emissive layer are stacked, formed on the substrate; a second emissive layer, in which a third sub-emissive layer and a fourth sub-emissive layer are stacked, formed on the first emissive layer; a first intermediate layer supplying electrons to the first emissive layer and a second intermediate layer supplying holes to the second emissive layer, wherein the first and second intermediate layers are formed between the first emissive layer and the second emissive layer; and a cathode formed on the second emissive layer.
Owner:SAMSUNG DISPLAY CO LTD

Nitride semiconductor light emitting device

The present invention discloses a nitride semiconductor light emitting device with improved light efficiency. The nitride semiconductor light emitting device includes a n-type nitride layer and p-type nitride layer, an active layer disposed between the n-type and p-type nitride layers and with a multiple quantum well structure wherein a plurality of quantum well layers and a plurality of quantum barrier layers are stacked alternatively in the active layer, and a superlattice layer between the active layer and the p-type nitride layer with asymmetric structure. Herein, a thickness of a well layers gradually increases from the p-type nitride layer to the active layer and the height of the barrier layers gradually increases from the active layer to the p-type nitride layer and therefore, an injection efficiency of a hole supplied from p-type nitride layer to an active layer is increased.
Owner:INTELLECTUAL DISCOVERY CO LTD

LED epitaxial wafer and forming method thereof

ActiveCN103915534AEnhanced Electronic Limitation CapabilitiesIncrease hole injectionSemiconductor devicesPhysicsBlock layer
The invention proposes an LED epitaxial wafer and a forming method thereof. The forming method comprises a first step of providing a substrate and forming a buffer layer on the substrate; a second step of forming a semiconductor material layer of a first doping type on the buffer layer; a third step of forming a quantum well structure on the semiconductor material layer of the first doping type; a fourth step of forming an electron blocking layer on the quantum well structure; and a fifth step of forming a semiconductor material layer of a second doping type on the electron blocking layer. The fourth step comprises forming a first AlxGa1-xN layer on the quantum well structure, and forming a second AlxGa1-xN layer on the first AlxGa1-xN layer. In the formation of the first AlxGa1-xN layer, a component x of an Al is gradually changed from a first component value to a component value, and the second component value is larger than the first component value. In the formation of the second AlxGa1-xN layer, a component x of an Al is constant. The LED epitaxial wafer and the forming method thereof can improve the internal quantum efficiency of LED chips, promote the light-emitting efficiency of the epitaxial wafer, and are suitable for the needs of high-power epitaxial wafers.
Owner:广东比亚迪节能科技有限公司

Light emitting device with high efficiency

A light emitting device includes a substrate including gallium nitride, and a semiconductor layer disposed on the substrate, the semiconductor layer including an n-type nitride semiconductor layer, an active layer disposed on the n-type nitride semiconductor layer, and a p-type nitride semiconductor layer disposed on the active layer, in which an angle defined between a crystal growth plane of the substrate and an m-plane thereof is in a range of 3.5° to 6.
Owner:SEOUL VIOSYS CO LTD

Novel compound and organic electroluminescent device including same

PendingCN109096124AIncreased hole injection and transport propertiesImprove efficiencyOrganic chemistrySolid-state devicesChemical compoundHole injection layer
The invention relates to a novel arylamine compound which, if used as a hole transport layer (HTL), a light emitting auxiliary layer (HT prime) or a hole injection layer (HIL), can increase hole injection and transport characteristics, thereby providing high efficiency and long life of a device.
Owner:DONGJIN SEMICHEM CO LTD

Organic compound taking triarylamine as core, and preparation method and application thereof

PendingCN110885338ANot easy to crystallizeGood film formation and thermal stabilityOrganic chemistrySolid-state devicesPhysicsOrganic compound
The invention relates to an organic compound taking triarylamine as a core, and a preparation method and an application thereof, and belongs to the technical field of semiconductors. The structure ofthe compound is represented by general formula (1) shown in the description. The invention also discloses the preparation method and the application of the compound. The compound has a high hole transport capability, and has improved hole injection and transport performances under a proper HOMO energy level; the compound has an electron blocking effect under a proper LUMO energy level to improve the recombination efficiency of excitons in a light-emitting layer; and when the compound is used as a light-emitting functional layer material of an OLED device, the exciton utilization rate and the radiation efficiency can be effectively improved by matching with the branched chains in the range of the invention.
Owner:JIANGSU SUNERA TECH CO LTD

Synthesis of cyclic metal iridium coordination compound and application of cyclic metal iridium coordination compound in preparing polymer white-light devices

The invention relates to synthesis of a cyclic metal iridium coordination compound. Fluorene with hole transmitting capacity and triphenylamino group are simultaneously introduced into a cyclic metal ligand, thereby effectively enhancing the hole injection and transmitting capacities of the luminescent layer and being beneficial to improving the electroluminescent property of the devices. The cyclic metal iridium coordination compound is a luminescent material, and can obtain the high-efficiency orange-yellow-light organic electrophosphorescence devices when being used for preparing organic electroluminescent devices. The cyclic metal iridium coordination compound and traditional blue-light iridium coordination compound FIrPic are proportionally mixed as the luminescent layer to obtain the high-efficiency white-light organic electroluminescent devices, thereby providing a material base for application of the organic electroluminescent devices in white-light illumination.
Owner:JIANGXI NORMAL UNIVERSITY
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