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An inkjet printing organic electroluminescent display and its preparation method

An inkjet printing and display technology, which is applied in the direction of electrical solid devices, semiconductor/solid device manufacturing, circuits, etc. Effect of column break length

Active Publication Date: 2017-02-22
GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the generally low viscosity and surface tension of small molecule solutions, the droplets ejected by inkjet printing are prone to crystallization and phase separation when they are naturally dried in the pixel pits to form a film, making it difficult to obtain uniform and uniform films. Inkjet printing of these high-performance small molecules The performance of the display screen made of the material is not satisfactory

Method used

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  • An inkjet printing organic electroluminescent display and its preparation method
  • An inkjet printing organic electroluminescent display and its preparation method
  • An inkjet printing organic electroluminescent display and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]choose figure 1 The inkjet printing display structure shown uses the patterned ITO transparent conductive glass as the substrate, cleans the surface pollutants with deionized water, blows them dry with high-pressure nitrogen, and uses ultraviolet light to irradiate them for surface modification, and then Prepare the PEDOT:PSS (polyaniline derivative) hole injection layer by spin coating on a 100-class ultra-clean bench, with a thickness of 40-80nm, heat at 200 degrees Celsius for 10 minutes in a nitrogen environment, and place it in a nitrogen glove box after cooling Spin coating PVK (polyvinyl carbazole, structure see figure 2 ) hole transport layer, the solvent is chlorobenzene, and the film thickness is about 40nm. Then spin-coat the blue light buffer layer (buffer layer), that is, the blue light-emitting layer film. The material of the buffer layer is dendritic compound G0 and blue light polyfluorene PFO (see the structure of figure 2 ) blended according to the m...

Embodiment 2

[0027] Repeat Example 1, the ratio used for inkjet printing red luminous solution is G0: Ir(piq) 2 acac:PS=100:10:1 (mass ratio), the ratio used for the green luminescent solution is G0: Ir(mppy) 3 :PS=100:10:1 (mass ratio), other conditions remain unchanged.

Embodiment 3

[0029] Repeat Example 1, the red luminescent solution used for inkjet printing is G0: MEH-PPV=10:1 (mass ratio), the green luminescent solution is G0: P-PPV=10:1 (mass ratio), and other conditions remain unchanged.

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Abstract

The invention provides an inkjet printing organic electroluminescence display and a preparation method thereof. The display structure includes a sequentially stacked transparent substrate, a patterned transparent anode layer, a hole injection layer, a hole transport layer, a light-emitting layer and a metal cathode, and the light-emitting layer contains soluble organic small molecules and polymer blends Material. The present invention proposes the blending of soluble organic small molecules and polymers as a printing solution to prepare a light-emitting layer, which takes advantage of the characteristics of high efficiency and long life of organic small molecules, and inhibits the phenomenon of phase separation and crystallization of organic small molecule solutions drying into films. Under the joint action of the solution, it can effectively control the process of the solution to dry naturally in the sub-pixel to form a film, and obtain a uniform light-emitting layer film, which effectively improves the performance of the inkjet printing display. The invention can provide a feasible new way for the industrialization of display screen products prepared by inkjet printing technology.

Description

technical field [0001] The invention relates to the technical field of preparing organic electroluminescence displays by inkjet printing technology, in particular to an inkjet printing organic electroluminescence display and a preparation method thereof. Background technique [0002] After nearly two decades of development, the all-solid-state organic electroluminescent display (OLED), which is characterized by thinness, low power consumption, high response, and high resolution, has temporarily emerged in the field of flat-panel display with liquid crystal display (LCD) as the mainstream. Its potential The market prospect of the industry is optimistic. At present, the OLED products entering the market are all small molecule OLEDs prepared by vacuum evaporation technology. Due to its complex preparation process and high equipment cost, this technology keeps the cost of the product high, and it is difficult to win in the competition with LCD, which has increasingly mature pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K71/135H10K85/00H10K50/11H10K71/00H10K71/15H10K85/1135H10K85/115H10K85/146H10K85/791H10K50/12
Inventor 彭俊彪刘南柳许伟王坚刘会敏孙圣
Owner GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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