A kind of organic luminescent material ink and its preparation method and inkjet printing method

A luminescent material, inkjet printing technology, applied in the direction of copying/marking, ink, printing, etc., can solve the problems of discontinuous film, insignificant viscosity increase, slow solvent volatilization speed, etc., and achieve the effect of uniform film distribution

Active Publication Date: 2021-11-05
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the viscosity of small molecule solutions is usually low, and the viscosity does not increase significantly with the increase of concentration during the drying process of the solution, resulting in poor film-forming properties
Especially when using a high boiling point solvent, due to the slow evaporation rate of the solvent, it is easy to cause dewetting during the film formation process, and finally a discontinuous film is obtained
At the same time, during the solvent volatilization process, the mismatch between the solvent evaporation rate and the interface change rate leads to the formation of a radial solution flow from the inside to the outside in the liquid film, which drives the solute to migrate to the edge and deposit at the edge to form a ring structure. "Coffee Ring Effect" Seriously Affects Thin Film Uniformity and Device Performance

Method used

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  • A kind of organic luminescent material ink and its preparation method and inkjet printing method
  • A kind of organic luminescent material ink and its preparation method and inkjet printing method
  • A kind of organic luminescent material ink and its preparation method and inkjet printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Weigh 2.5 mg of PVAC2 and place it in a container, then weigh 0.6 ml of cyclohexanone and add it to the container to form a mixed solution, then weigh 0.2 ml of isopropyl toluene and 0.2 ml of cyclohexylbenzene, put them into the above mixing In the solution, the first solvent content is 61.0wt%, the second solvent content is 18.3wt%, the third solvent content is 20.4wt%, and the solute content is 0.3wt%. Stir at room temperature, and after complete dissolution, an organic luminescent material ink is obtained.

[0049] figure 1 It is the optical microscope image (the left figure is an optical microscope image, and the right figure is a fluorescence microscope image) of the PVAC2 film deposited in the PVAC2 film in the restricted channel by inkjet printing of the PVAC2 ink prepared in embodiment 1, figure 2 is the cross-sectional height map of the CP3VAC film deposited in the confinement channel by inkjet printing of PVAC2 ink in embodiment 1, from figure 1 and figur...

Embodiment 2

[0051] Weigh 2.5 mg of PVAC2 and place it in a container, then weigh 0.5 ml of chlorobenzene and add it to the container to form a mixed solution, then weigh 0.3 ml of cumene and 0.2 ml of cyclohexylbenzene, and put them into the above mixed solution , wherein the first solvent content is 55.1wt%, the second solvent content is 25.8wt%, the third solvent content is 18.9wt%, and the solute content is 0.2wt%. After being stirred at room temperature and completely dissolved, an organic small molecule light-emitting material ink suitable for inkjet printing and capable of improving the uniformity of the printed film is obtained.

Embodiment 3

[0053] Weigh 3 mg of PVAC2 and place it in a container, then weigh 0.5 ml of o-xylene and add it to the container to form a mixed solution, then weigh 0.3 ml of isopropyl toluene and 0.2 ml of chloronaphthalene, and put them into the above mixed solution Among them, the first solvent content is 46.9wt%, the second solvent content is 27.3wt%, the third solvent content is 25.5wt%, and the solute content is 0.3wt%. After being stirred at room temperature and completely dissolved, an organic small molecule light-emitting material ink suitable for inkjet printing and capable of improving the uniformity of the printed film is obtained.

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Abstract

The invention provides an organic luminescent material ink, comprising: a first solvent of 20wt% to 89.9wt%; a second solvent of 5wt% to 39.9wt%; a third solvent of 5wt% to 39.9wt%; a solute of 0.1wt% to 5wt% The total content of the above components is 100%; the first solvent is a low boiling point high surface tension organic solvent; the second solvent is a high boiling point low surface tension organic solvent; the third solvent is a high boiling point high viscosity organic solvent Solvent; the solute is an organic light-emitting small molecule material that can be dissolved in the first solvent, the second solvent, the third solvent or a mixed solvent thereof. In the present invention, the three-solvent system synergistically controls the uniformity of the film, inhibits the dewetting of the small molecule luminescent film, and can obtain a high-quality and large-area patterned organic small molecule luminescent film, which has a uniform film distribution and can realize high-efficiency large-area organic optoelectronics. High-quality print preparation of devices.

Description

technical field [0001] The invention relates to the technical field of printed electronics, in particular to an organic luminescent material ink, a preparation method thereof, and an inkjet printing method. Background technique [0002] Inkjet printing can achieve high-efficiency digital processing of high-precision microstructures in a low-cost solution method, and has outstanding features such as being suitable for flexible substrates and roll-to-roll printing methods. It is considered to be the most effective method for patterning organic photoelectric thin films. [0003] For inkjet printing of small molecule luminescent materials, the main problem is to overcome the easy dewetting and edge deposition of inkjet printing films to achieve uniform and pinhole-free film deposition. Since the solution viscosity of small molecules is usually low, and the viscosity of the solution does not increase significantly with the increase of concentration during the drying process, resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/30C09D11/36B41M5/00
CPCB41M5/0023B41M5/0047B41M5/0064C09D11/30C09D11/36
Inventor 韩艳春于新红彭忠祥
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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