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Electroluminescent device and preparation method thereof, display panel and display device

A technology of electroluminescent devices and display panels, which is applied in the fields of electric solid-state devices, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc. The light conversion efficiency has a great influence on the problems, so as to achieve the effect of improving the luminous efficiency and increasing the utilization rate

Inactive Publication Date: 2018-05-15
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the electron mobility is greater than the hole mobility, there is an imbalance between electron and hole currents when the external voltage drives the device to emit light, and there is a problem that some electrons (ie, leakage current) cannot be used for light emission, which affects the electro-optical conversion efficiency of the device. bigger

Method used

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  • Electroluminescent device and preparation method thereof, display panel and display device
  • Electroluminescent device and preparation method thereof, display panel and display device
  • Electroluminescent device and preparation method thereof, display panel and display device

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Embodiment 1

[0030] Such as figure 1 As shown, Embodiment 1 of the present invention provides an electroluminescent device, comprising: a cathode 10 and an anode 20 arranged oppositely; a luminescent layer 30 disposed between the cathode 10 and the anode 20; the electroluminescent device further includes: The thermally excited delayed fluorescent material is used to transfer the formed excitons to the luminescent substance in the light-emitting layer; the thermally excited delayed fluorescent material is arranged on the surface of the light-emitting layer 30 close to the anode 20 to form the carrier collection layer 40; And / or, the thermally excited delayed fluorescent material is doped in the light emitting layer.

[0031] The above thermally activated delayed fluorescence material (TADF for short) is the third generation of organic luminescent material developed after organic fluorescent material and organic phosphorescent material. This type of TADF material generally has a small singl...

Embodiment 2

[0052] Since quantum dot materials and thermally excited delayed fluorescent materials are usually formed by different preparation methods, compared to the structure of doping thermally excited delayed fluorescent materials into the quantum dot light-emitting layer, the thermally excited delayed fluorescent material is arranged in the quantum dot light-emitting layer. The surface is easier to prepare, therefore, referring to the aforementioned figure 1 As shown, Embodiment 2 of the present invention provides the following quantum dot electroluminescent device, specifically including the following structure:

[0053] A substrate engraved with an ITO conductive electrode is provided as a substrate, and the ITO conductive electrode is used as a cathode 10;

[0054] The electron transport layer 11 arranged on the surface of the cathode 10 is composed of ZnO NPs dispersed in a solvent, wherein ZnO NPs refer to ZnO nanoparticles (ZnO Nanoparticles);

[0055] A green light quantum d...

Embodiment 3

[0065] On the basis of the above, Embodiment 3 of the present invention also provides a preparation method of the above-mentioned electroluminescent device, including: the step of forming a cathode and an anode oppositely arranged, and a light-emitting layer located between the cathode and the anode; the preparation method also Including: the step of forming a carrier collection layer made of thermally excited delayed fluorescent material on the surface of the light emitting layer close to the anode; and / or the step of forming a thermally excited delayed fluorescent material doped in the light emitting layer; wherein, The thermally excited delayed fluorescent material is used to transmit the formed excitons to the luminescent substances in the luminescent layer.

[0066] The above preparation method specifically includes: using a solution method to sequentially form an electron transport layer and a light-emitting layer on the surface of the cathode; using an evaporation method...

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Abstract

The invention provides an electroluminescent device, a preparation method of the electroluminescent device, a display panel, and a display device, relating to the technical field of display and beingcapable of improving the light-emitting efficiency of the device. The electroluminescent device comprises a cathode and an anode which are oppositely arranged; a light-emitting layer arranged betweenthe cathode and the anode; the electroluminescent device further comprises a thermal excitation delay fluorescent material used for transmitting the formed excitons to the light-emitting substance inthe light-emitting layer; the thermal excitation delay fluorescent material arranged on the surface, close to one side of the anode, of the light-emitting layer to form a carrier collection layer; andor, the thermal excitation delay fluorescent material is doped in the light-emitting layer. The invention also provides a preparation method of the electroluminescent device, a display panel comprising the electroluminescent device, and a display device.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an electroluminescence device and a preparation method thereof, a display panel and a display device. Background technique [0002] The electroluminescent device uses the electrons and holes injected from the electrodes on both sides to recombine in the light-emitting layer under the drive of the external voltage to generate excitons, and the energy is transferred to the light-emitting molecules through the excitons to excite the latter to emit light. [0003] Because the electron mobility is greater than the hole mobility, there is an imbalance between electron and hole currents when the external voltage drives the device to emit light, and there is a problem that some electrons (ie, leakage current) cannot be used for light emission, which affects the electro-optical conversion efficiency of the device. larger. Contents of the invention [0004] In view of this, in order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/115H10K50/11H10K2101/10H10K59/12C09K11/00H10K2102/321H10K2101/20H10K50/15H10K50/16H10K71/00
Inventor 乔泊徐征吴晓
Owner BOE TECH GRP CO LTD