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Down-conversion luminescent material and preparation and application thereof

A technology for transforming luminescence and reaction, applied in luminescent materials, chemical instruments and methods, thermometers with physical/chemical changes, etc., can solve the problems of high price, poor thermal stability and mechanical strength, unfavorable applications, etc., and achieve low cost , easy-to-operate effect

Active Publication Date: 2021-08-03
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The host material includes various types such as fluoride, oxyfluoride, and oxide. Among them, fluoride has low phonon energy and high luminous efficiency, but its thermal stability and mechanical strength are poor, which is not conducive to application.
The double molybdate material has good thermal stability and is a highly efficient matrix of rare earth doped luminescent materials. Chinese patent CN104316214A discloses Er3+ and Yb3+ doped Application of miscellaneous ALn(MoO4)2 up-conversion luminescent material in optical temperature sensor, wherein Ln is one of La, Gd, Y and Lu, the price Expensive, not conducive to widespread use

Method used

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  • Down-conversion luminescent material and preparation and application thereof
  • Down-conversion luminescent material and preparation and application thereof
  • Down-conversion luminescent material and preparation and application thereof

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preparation example Construction

[0042] The present invention provides a method for preparing a down-conversion luminescent material described in the above technical solution, comprising the following steps:

[0043] According to the stoichiometric ratio shown in formula I, water-soluble calcium salt, water-soluble strontium salt, water-soluble dysprosium salt, water-soluble europium salt, water-soluble molybdate and water are mixed, and the total pH value is 8-12. Precipitation reaction to obtain precursor precipitation;

[0044] The precursor is precipitated and calcined to obtain the down-conversion luminescent material.

[0045] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0046] The present invention mixes water-soluble calcium salt, water-soluble strontium salt, water-soluble dysprosium salt, water-soluble europium salt, water-soluble molybdate and water according to the stoichiometric ratio sh...

Embodiment 1

[0076] Take 0.8798gEu 2 o 3 Stir and dissolve in 20mL of concentrated nitric acid (mass percent concentration: 68%). After the dissolution is complete, perform acid discharge at 80°C and dry at 90°C. Add deionized water to obtain 100mLEu(NO 3 ) 3 solution;

[0077] Take 0.9325gDy 2 o 3 Stir and dissolve in 20mL of concentrated nitric acid (mass percent concentration: 68%). After the dissolution is complete, perform acid discharge at 80°C and dry at 90°C. Add deionized water to obtain 100mL of Dy(NO 3 ) 3 solution;

[0078] 0.7084g Ca(NO 3 ) 2 4H 2 O, 0.03174g Sr(NO 3 ) 2 , 8mL Eu(NO 3 ) 3, 2mL Dy(NO 3 ) 3 Stir and dissolve in 20mL deionized water to obtain a water-soluble metal salt solution with a pH value of 2;

[0079] 1.2098g Na 2 (MoO 4 )·4H 2 O is stirred and dissolved in 40mL deionized water to obtain a molybdate solution, and the pH value of the water-soluble molybdate solution is adjusted to 11 using ammoniacal liquor (mass percentage concentration ...

Embodiment 2

[0083] Take 0.8798gEu 2 o 3 Stir and dissolve in 20mL of concentrated nitric acid (mass percent concentration: 68%). After the dissolution is complete, perform acid discharge at 80°C and dry at 90°C. Add deionized water to obtain 100mLEu(NO 3 ) 3 solution;

[0084] Take 0.9325gDy 2 o 3 Stir and dissolve in 20mL of concentrated nitric acid (mass percent concentration: 68%). After the dissolution is complete, perform acid discharge at 80°C and dry at 90°C. Add deionized water to obtain 100mL of Dy(NO 3 ) 3 solution;

[0085] 0.6612Ca(NO 3 ) 2 4H 2 O, 0.03174g Sr(NO 3 ) 2 , 12mL Eu(NO 3 ) 3 , 2mL Dy(NO 3 ) 3 Stir and dissolve in 20mL deionized water to obtain a water-soluble metal salt solution with a pH value of 2;

[0086] 1.2098g Na 2 (MoO 4 )·4H 2 O is stirred and dissolved in 40mL deionized water to obtain a molybdate solution, and the pH value of the water-soluble molybdate solution is adjusted to 11 using ammoniacal liquor (mass percentage concentration ...

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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to a down-conversion luminescent material as well as preparation and application thereof. The invention provides a down-conversion luminescent material of which the chemical formula is Ca<0.7-x-y>Sr0.3 (MoO4) 2: yDy < 3 + >, xEu < 3 + >, wherein x is more than 0 and less than or equal to 0.2, and y is more than or equal to 0.01 and less than or equal to 0.02. According to the down-conversion luminescent material provided by the invention, Eu < 3 + > has strong red light emission, Dy < 3 + > has strong yellow light emission, when the doping concentrations of Eu < 3 + > and Dy < 3 + > in CaSr (MoO4) 2 are respectively x and y, the value of x is more than 0 and less than or equal to 0.2, and the value of y is more than or equal to 0.01 and less than or equal to 0.02, the fluorescence intensity ratio (FIR) of Eu < 3 + > and Dy < 3 + > shows obvious temperature dependence, and the down-conversion luminescent material can be used as an optical temperature sensor.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a down-conversion luminescent material and its preparation and application. Background technique [0002] The optical temperature sensor refers to the use of rare earth ion fluorescence intensity ratio (FIR, Fluorescence Intensity Ratio) technology for temperature detection. FIR technology is to characterize the temperature in the environment by detecting the relationship between the fluorescence intensity ratio produced by the thermal coupling energy level of rare earth ions and the temperature. The optical temperature sensor has non-contact, high accuracy, high sensitivity and excellent anti-interference ability. Compared with the traditional contact temperature sensor, it can be applied to harsher environments, such as high-pressure environments and temperature remote sensing in uninhabited areas. . [0003] So far, the rare earth active ions for op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68G01K11/20
CPCC09K11/7794G01K11/20
Inventor 尹学爱
Owner BINZHOU UNIV