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White organic electroluminescent device and preparation method thereof

An electroluminescence, electromechanical technology, applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve problems such as driving voltage increase, carrier aggregation, Joule heating, etc.

Inactive Publication Date: 2010-10-13
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The usual methods to solve the problem of chromaticity change are: introduce HBL layer and EBL layer to suppress, but the introduction of HBL layer will increase the driving voltage, which may cause thermal effects to damage the device, and this complex device structure is not conducive to application In the field of production; using a single light-emitting layer with only one recombination region, the disadvantages of this structure have been mentioned above; using materials with a large difference in energy HOMO or LUMO to form a well structure to confine excitons, but this will cause carrier Aggregation will increase the driving voltage, reduce the efficiency, and generate Joule heat, which is prone to current-induced quenching effect and affects the life of the device

Method used

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  • White organic electroluminescent device and preparation method thereof
  • White organic electroluminescent device and preparation method thereof
  • White organic electroluminescent device and preparation method thereof

Examples

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and further explanation to this example.

[0029] like figure 1 As shown, this white organic electroluminescent device includes an ITO glass substrate 1, a buffer layer 2 on the substrate, a hole transport layer 3, a blue layer 4 on the hole transport layer 3, a blue layer on the above blue The double host red light layer 5 on the layer 4, the electron transport layer 6 on the above double host red light layer 5, and the composite cathode 7 and 8.

[0030] The detailed steps and process of the preparation method of this white organic electroluminescent device are as follows:

[0031] (1) Select an ITO glass substrate 1 that meets the required size (effective area 5mm×5mm) and surface resistance (10Ω / □). The ITO glass is first cleaned with detergent powder, and then ultrasonically cleaned with acetone, absolute ethanol, and deionized water. Wash for 30 minutes, dry in an oven, and put into vacuum evaporation equipment aft...

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Abstract

The invention relates to a white organic electroluminescent device and a preparation method thereof. The device consists of an ITO glass substrate, a buffer layer, a cavity transport layer, a single-subject blue light layer, a double-subject red light layer, an electronic transport layer and a composite cathode sequentially. Each structural layer is prepared by a vacuum evaporation method. In the structure of the invention, a luminous layer consists of the single-subject blue light layer and the red light layer with a double-subject structure, and the subject of the blue light layer and one of the subjects of the red light layer are made of the same material, and the other material of the subject of the red light layer is the same as the material of the electronic transport layer. The device with the structure has higher luminous efficiency, can effectively disperse excitons, enhances carrier infusion and transport balance, and inhibits color error and efficiency reduction under a higher drive current. With the structure, the white organic electroluminescent device with the structure can be widely applied on a hi-fi organic full-color display device.

Description

technical field [0001] The present invention relates to a white organic electroluminescent device with a double-body structure in which the red light layer adopts a double-emitting layer and a preparation method thereof, especially a white organic electroluminescent device with stable efficiency and chromaticity under a relatively high driving current method of preparation. Background technique [0002] White Organic Light Emitting Device (OLED) has great potential in the fields of flat panel displays, LCD backlight modules and lighting due to its ultra-thin, flexible, fast response, low power consumption and simple fabrication. It has great application potential and is expected to replace traditional fluorescent lighting. These applications require white OLEDs to have characteristics such as high brightness, high efficiency, long life, and stable chromaticity. [0003] The light emitting principle of the OLED device is to deposit a very thin organic material between two e...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
Inventor 朱文清陈雪王赛王强
Owner SHANGHAI UNIV
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