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Micro-cavity structure top emitting device and preparation method thereof

A top emission and microcavity technology, applied in the field of microcavity structure top emission devices and their preparation, can solve the problems of restricting the application of inkjet printing technology, high material requirements, and high production costs, and achieves easy control of film thickness, simple equipment, and high production cost. low cost effect

Inactive Publication Date: 2020-07-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, uncertain factors such as whether the ink droplet can be accurately positioned, whether the ink droplet size is uniform, and whether the ink droplet can form a flat film after drying on the substrate limit the application of inkjet printing technology in the fabrication of OLED display devices.
Laser-induced thermal imaging technology is a technology that converts the light energy of laser light into heat energy to transfer the patterned layer on the donor substrate to the closely contacting acceptor substrate. This technology has high precision and is suitable for large-size display devices. However, there are still problems such as high material requirements, high production costs, and low product yields.

Method used

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  • Micro-cavity structure top emitting device and preparation method thereof
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  • Micro-cavity structure top emitting device and preparation method thereof

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preparation example Construction

[0028] The invention provides a method for preparing a top-emitting device with a microcavity structure, comprising the following steps:

[0029] Using the anode substrate as a working electrode, performing a first electrochemical polymerization in a first electrolyte solution to obtain an anode substrate deposited with a hole transport layer; the first electrolyte solution contains a hole transport electroactive monomer and a supporting electrolyte;

[0030] The anode substrate deposited with the hole transport layer is used as a working electrode, and the second electrochemical polymerization is carried out in the second electrolyte to form a white light-emitting layer on the surface of the hole transport layer; the second electrolyte contains white hair Photoactive monomers and supporting electrolytes;

[0031] An electron transport layer, an electron injection layer and a cathode layer are sequentially vapor-deposited on the surface of the white luminescent layer to obtain...

Embodiment 1

[0071] 1) Preparation of the anode layer of the top emission device

[0072] Sputtering ITO with a thickness of 90nm on metal Al with a thickness of 150nm to obtain an anode substrate;

[0073] 2) Preparation of hole transport layer

[0074] The anode substrate Al / ITO is used as a working electrode, the electroactive precursor molecule in the electrolyte used is 4,4',4"-tris(carbazol-9-yl)triphenylamine (TCTA), and the supporting electrolyte is four Butyl ammonium hexafluorophosphate (TBAPF 6 ), the solvent of the electrolyte is a mixed solvent of dichloromethane, acetonitrile and propylene carbonate (volume ratio is 2.5:0.9:1.6), and the concentration of TCTA in the electrolyte is 4×10 -4 mol / L, the concentration of the supporting electrolyte in the electrolyte is 0.1mol / L; the first electrochemical polymerization is carried out in the above electrolyte by cyclic voltammetry, the scanning voltage range is -0.6 ~ 1.22V, and the scanning speed is 300mV / S, the number of scan...

Embodiment 2

[0086] The preparation process of the top-emitting device of this embodiment is the same as that of Embodiment 1, the only difference is:

[0087] Design the anode substrate (referring to the metal reflective layer and ITO layer) of the top-emitting device as a red, green and blue array layout, such as Figure 4Shown: the pixels in each column of the substrate are connected together, and there is no conduction between the columns. When the electricity is turned on, the conductive state of the pixels in the columns is consistent, and whether the pixels in each column are powered is determined by the external circuit. Since the electropolymerization process only occurs in the energized area, the electroactive precursor molecules will not undergo redox reactions and then be deposited on the substrate in the non-energized area. Therefore, different thicknesses can be deposited by controlling the on-off state of each column of pixels. film. For example, when the first and fourth c...

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Abstract

The invention provides a micro-cavity structure top emission device and a preparation method thereof, and belongs to the technical field of organic electroluminescent materials and devices. The organic thin film (the hole transport layer and the white light emitting layer) is prepared by adopting an electro-polymerization method, and the method has the advantages of simple equipment, simplicity inoperation, capability of finishing the polymerization process at normal temperature and normal pressure and low cost. The organic thin film is prepared by adopting an electropolymerization method, and the thickness of the thin film can be regulated and controlled through parameters of an electropolymerization process; according to the top emitting device, due to the existence of a micro-cavity effect, light generates an interference phenomenon in a micro-cavity, so that the light intensity of emergent light is enhanced, the spectrum is narrowed, and the wavelength is moved; the total cavity length of the microcavity can be determined by the thickness of an organic layer in the top emission device, and the color of emergent light can be regulated and controlled by the thickness of the electro-polymerization film layer. The method provided by the invention avoids the problem of alignment error caused by mask plate movement during evaporation of a color film by adopting an evaporation method.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent materials and devices, in particular to a top-emitting device with a microcavity structure and a preparation method thereof. Background technique [0002] The organic light emitting diode device (OLED) structure can be divided into bottom-emitting devices and top-emitting devices according to its light-emitting direction. The bottom-emitting device emits light from one side of the substrate, while the top-emitting device emits light from a place far away from the substrate. Most OLED display devices on the market use active matrix circuits to drive light-emitting pixels, so each pixel is equipped with a driving circuit with four or more thin-film transistors (TFTs) and a capacitor. Depositing opaque TFTs on the substrate will affect the light-emitting area of ​​the bottom-emitting device, resulting in a lower aperture ratio of the display device. Due to the different light emit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L51/50H01L51/52
CPCH10K71/125H10K50/15H10K50/852H10K50/11H10K2102/3026H10K71/00
Inventor 刘琳琳梁依倩
Owner SOUTH CHINA UNIV OF TECH
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