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Method for realizing multi-color variable pattern by using long afterglow/quantum dot composite luminescent material

A technology of luminescent materials and quantum dots, applied in luminescent materials, nanotechnology for materials and surface science, chemical instruments and methods, etc. Simple process, wide application prospect, easy operation effect

Pending Publication Date: 2022-02-15
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluorescent materials used for traditional information storage or anti-counterfeiting have disadvantages such as single luminescent color, low discrimination, visible to the naked eye, poor concealment, low information storage capacity, and poor anti-counterfeiting level.

Method used

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  • Method for realizing multi-color variable pattern by using long afterglow/quantum dot composite luminescent material
  • Method for realizing multi-color variable pattern by using long afterglow/quantum dot composite luminescent material
  • Method for realizing multi-color variable pattern by using long afterglow/quantum dot composite luminescent material

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Effect test

Embodiment 1

[0034] A schematic flow chart of a method for preparing color-variable patterns with long-lasting phosphorescent and quantum dot fluorescent composite luminescent materials, as shown in figure 1 shown. Specifically include the following steps:

[0035] (1) Preparation of red, green, and blue quantum dot inks: prepare red, green, and blue CdSe quantum dot powders separately in advance, take 50 mg of red, green, and blue CdSe quantum dot powders and sequentially add a mixed solution of toluene and o-dichlorobenzene with a volume ratio of 4:1 In the process, the prepared red, green and blue quantum dot mixed solution was mixed evenly on a stirring table with a rotation speed of 1500rpm and a rotation time of 20min, and after fully dissolving, the red, green and blue quantum dot ink was sequentially prepared;

[0036] (2) Preparation of long-lasting phosphorescence and quantum dot fluorescence composite luminescent printing paste: long-lasting strontium aluminate (SrAl 2 o 4 :E...

Embodiment 2

[0039](1) Preparation of red, green, and blue quantum dot inks: prepare red, green, and blue InP quantum dot powders separately in advance, take 50 mg of red, green, and blue InP quantum dot powders and add them in turn to a mixed solution of n-octane and ethanol with a volume ratio of 4:1 , mixing the prepared red, green and blue quantum dot mixed solution evenly on a stirring table with a rotating speed of 2000rpm and a rotating time of 20min, and after fully dissolving, the red, green and blue quantum dot ink is sequentially prepared;

[0040] (2) Preparation of long-lasting phosphorescence and quantum dot fluorescence composite luminescent printing ink: the long-lasting (Ca 2 MgSi 2 o 7 :Eu 2+ , Dy 3+ ) powder material into CR-168A thermal gel, mixed evenly to make long afterglow (Ca 2 MgSi 2 o 7 :Eu2+, Dy3+) powder dispersion, long afterglow (Ca 2 MgSi 2 o 7 :Eu 2+ , Dy 3+ ) The dispersion of the powder was stirred at room temperature for about 1 hour with a co...

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Abstract

The invention relates to a method for realizing a multi-color variable pattern by using a long afterglow / quantum dot composite luminescent material. The method comprises the following steps: adding red, green and blue quantum dot powder into a mixed solution of toluene and o-dichlorobenzene to prepare red, green and blue quantum dot ink; adding a long-afterglow powder material into thermal gel to prepare a dispersion liquid, dropwise adding the red, green and blue quantum dot ink into the dispersion liquid of the long-afterglow powder, and stirring at a constant temperature to prepare phosphorescent and fluorescent composite luminescent printing paste with moderate viscosity; and printing printing paste on a substrate through a silk-screen printing technology or ink-jet printing to form a pattern with the pixel size reaching the micron-scale and nano-scale. Before and after excitation of ultraviolet light, the prepared pattern has the characteristics of variable light emitting color, adjustable light emitting intensity and wavelength, wide color gamut, high brightness, repeated excitation and good stability, multi-dimensional and multi-layer color-variable spectral signals can be realized, under the assistance of intensity multiplexing and wavelength multiplexing technologies, novel multi-dimensional optical information storage and anti-counterfeiting encryption can be formed, and the method has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of information storage and anti-counterfeiting encryption, in particular to a method for realizing multicolor variable patterns with long afterglow / quantum dot composite luminescent materials. Background technique [0002] As a new type of luminescent material, quantum dots have the advantages of excellent photoelectric properties, reliable photostability, high fluorescence quantum yield, high color purity, narrow luminescence peak, variable luminescence color, and adjustable size. It is widely used in the fields of information security, information storage and anti-counterfeiting. The long afterglow material is a kind of special optoelectronic functional material which is different from the traditional phosphorescent material because of its unique delayed luminescence characteristics. When excited by ultraviolet light, visible light or high-energy rays, long-lasting luminescent materials can store part of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/80C09K11/79C09K11/70B82Y20/00B82Y30/00
CPCC09K11/025C09K11/883C09K11/7792C09K11/77922C09K11/70B82Y20/00B82Y30/00
Inventor 胡海龙李福山陈航朱阳斌郭太良
Owner FUZHOU UNIV
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