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1832results about How to "Improve luminous efficiency" patented technology

Organic electroluminescent device and display device

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises an organic luminescent layer; the organic luminescent layer comprisesa main body material, a sensitizing agent material and a resonance thermally activated delayed fluorescence (TADF) material; the main body material is a broad-band gap material; the sensitizing agentmaterial is a thermally activated delayed fluorescence material; a singlet-state energy level of the thermally activated delayed fluorescence material is located between a singlet-state energy level of the broad-band gap material and a singlet-state energy level of the resonance thermally activated delayed fluorescence material; and a triplet-state energy level of the thermally activated delayed fluorescence material is located between a triplet-state energy level of the broad-band gap material and a triplet-state energy level of the resonance thermally activated delayed fluorescence material.With the organic electroluminescent device and the display device, the defects of short life time and wide spectrum of the device caused by a condition that the traditional TADF material is adopted to emit light at the present stage can be overcome.
Owner:KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1

White organic light emitting device and method for manufacturing the same

The present invention relates to a white organic light emitting device and a method for manufacturing the same, in which a hole transport layer is made to have an energy level higher than an energy level of an excited state of a phosphorescent light emitting layer adjacent thereto for enhancing light emitting efficiency of the hole transport layer without an additional exciton blocking layer, and a dopant content in the phosphorescent light emitting layer is adjusted for preventing color shift from taking place.
The white organic light emitting device includes an anode and a cathode placed on a substrate opposite to each other, a charge generation layer formed between the anode and the cathode, a first stack of a first hole transport layer, a first light emitting layer for emitting a blue light, and a first electron transport layer between the anode and the charge generation layer, and a second stack of a second hole transport layer, a second light emitting layer having a host doped with phosphorescence red and green together, and a second electron transport layer between the charge generation layer and the cathode, wherein the second hole transport layer has an energy level set higher than a triplet excited state energy level of the second light emitting layer.
Owner:LG DISPLAY CO LTD

Light emitting device and fabrication method thereof

There is provided a method of fabricating a vertical light emitting diode. The method comprises the steps of: growing a low doped first conductive semiconductor layer on a sacrificial substrate; forming an aluminum layer on the low doped first conductive semiconductor layer; forming an AAO layer having a large number of holes formed therein by performing anodizing treatment of the aluminum layer; etching and patterning the low doped first conductive semiconductor layer using the aluminum layer with a large number of the holes as a shadow mask to expose a portion of the low doped first conductive semiconductor layer, thereby forming a large number of grooves; removing the aluminum layer remaining on the low doped first conductive semiconductor layer; sequentially forming a high doped first conductive semiconductor layer, an active layer and a second conductive semiconductor layer on the low doped first conductive semiconductor layer with a large number of the grooves; forming a metal reflective layer and a conductive substrate on the second conductive semiconductor layer; separating the sacrificial substrate; and forming an electrode pad on the other surface of the low doped first conductive semiconductor layer, the electrode pad being filled in a large number of the grooves to be in ohmic contact with the high doped first conductive semiconductor layer
Owner:SEOUL VIOSYS CO LTD
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