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Photochromic up-conversion fluorescence switch and preparation method thereof

A photochromic and fluorescent switch technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, nano optics, etc., can solve the problems of large photochromic switch size, difficult data reading, poor repeatability, etc. Readability, high repeatability, and easy operation

Active Publication Date: 2020-06-30
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a photochromic up-conversion fluorescent switch based on photothermal conversion that can realize simple, fast and highly repeatable optical switch operation at micro-nano size and its preparation method to overcome the problems of large size, difficult data reading, cumbersome operation, slow response and poor repeatability of existing photochromic switches

Method used

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  • Photochromic up-conversion fluorescence switch and preparation method thereof
  • Photochromic up-conversion fluorescence switch and preparation method thereof
  • Photochromic up-conversion fluorescence switch and preparation method thereof

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Embodiment 1

[0031] With 2mol% Er 3+ and 18mol% Yb 3+ As the doping element of the light-emitting crystal nucleus in the optical switch, 100mol% Nd 3+ NaYF synthesized by hydrothermal method as a dopant element for exothermic shell 4 The substrate and the inert isolation layer are used as examples for illustration. The optical switch component is abbreviated as 2Er / 18Yb:NaYF 4 @NaYF 4 @NaNdF 4 , the present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

[0032] First prepare the luminescent crystal nucleus: a total amount of 9.5 mmoles of ammonium fluoride and sodium hydroxide is configured as 2.5 milliliters of aqueous solution at a stoichiometric ratio of 1:3.75, then add 5 milliliters of oleic acid and 5 milliliters of ethanol and stir at room temperature until The solution is homogeneous. A total of 1 mmol of ErCl 3 , YbCl 3 , YCl 3 According to the stoichiometric ratio Er 3+ :Yb 3+ :Y 3+ =0.02:0.18:0....

Embodiment 2

[0037] With 0.5mol% Tm 3+ and 18mol% Yb 3+ As the doping element of the luminescent crystal nucleus in the photochromic switch, 100mol% Er 3+ As a dopant element for the exothermic shell, NaLuF 4 As an example of the substrate and the inert isolation layer, the specific components of the optical switch in this embodiment are abbreviated as 0.5Tm / 18Yb:NaLuF 4 @NaLuF 4 @NaErF 4 , the specific implementation method is the same as the steps of Example 1, only the Er in the process of preparing the luminescent crystal nucleus 3+ :Yb 3+ :Y 3+ = The stoichiometric ratio of 0.02:0.18:0.80 is changed to Tm 3+ :Yb 3+ :Lu 3+ =0.005:0.180:0.815, the YCl of the inert isolation layer 3 :EDTA-2Na:NaF:NH 4 The stoichiometric ratio of F=0.3:0.75:4:8 was changed to LuCl 3 :EDTA-2Na:NaF:NH 4 F=0.3:0.75:4:8, finally the NdCl in the exothermic shell 3 :EDTA-2Na:NaF:NH 4 The stoichiometric ratio of F=0.3:0.75:4:8 was changed to ErCl 3 :EDTA-2Na:NaF:NH 4 F=0.3:0.75:4:8 is enough.

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Abstract

The invention discloses a photochromic up-conversion fluorescence switch and a preparation method thereof, wherein the photochromic switch is based on a rare earth doped crystal material, and is specifically of a three-layer core-shell-shell structure which sequentially comprises a low-concentration light-emitting crystal nucleus, an inert separation layer and a high-concentration photo-thermal conversion shell layer from inside to outside. The fluorescence intensity of a crystal nucleus under the excitation of another wavelength is reduced by utilizing the heating effect of a photo-thermal shell layer under a specific excitation waveband, so that the on-off function of light under a single-particle level is realized. The photochromic switch has the advantages of being small in size, proneto data reading, rapid in response, easy and convenient to operate, high in repeatability and the like, and the defects that an existing photochromic switch is large in size, slow in response, difficult to read data, complex in operation and poor in repeatability are mainly overcome.

Description

technical field [0001] The present invention relates to a photochromic up-conversion fluorescent switch and a preparation method thereof, in particular to a novel photochromic up-conversion fluorescent switch based on photothermal effect and a preparation method thereof, involving the construction, preparation and application of micro-optical materials, It belongs to the field of optical materials. Background technique [0002] Photochromism refers to the chemical reaction or physical change of certain substances under the action of light of a certain wavelength and intensity, resulting in reversible changes in their light absorption or light emission characteristics. Traditional photochromism often involves changes in the color of substances, so it is often used in applications such as color-changing glasses and smart windows. In a broad sense, photochromism generally refers to the change of the absorption or luminescence characteristics of objects under external light sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K9/00C09K11/77B82Y20/00B82Y30/00B82Y40/00C09K5/14
CPCC09K11/02C09K9/00C09K11/7773B82Y20/00B82Y30/00B82Y40/00C09K5/14Y02B20/00
Inventor 刘禄周子文刘宇孙显昊张建中
Owner HARBIN ENG UNIV
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