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A micron-scale up-conversion luminescent material and its preparation method

A luminescent material, micron-scale technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of limited luminous intensity, poor dispersion, low yield, etc., and achieve low equipment requirements, regular particle morphology, and high output. Effect

Active Publication Date: 2021-07-13
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to solve the problems of low yield, poor dispersibility and limited luminous intensity of rare earth up-conversion luminescent materials in the prior art, and provide a kind of regular shape, high yield, good dispersibility, and good optical properties. Characteristic up-conversion luminescent material and preparation method thereof

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  • A micron-scale up-conversion luminescent material and its preparation method
  • A micron-scale up-conversion luminescent material and its preparation method
  • A micron-scale up-conversion luminescent material and its preparation method

Examples

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Embodiment 1

[0049] A micron-scale up-conversion luminescent material (NaYF 4 : Yb, Er), its preparation method comprises the following steps:

[0050] Pour 1L of 1mol / / L NaF solution into the impinging flow reaction, adjust the reactor speed to 800rpm, and the reactor temperature to 50°C; NaF / Er is 12:1, Yb:Y:Er=20:79:1 According to the ratio requirements, prepare the rare earth precursor solution, and then press Er 3+ The molar ratio of / EDTA is 2:1, it is required to quickly mix the prepared rare earth precursor solution and EDTA solution, heat and stir after mixing, the heating temperature is 70°C, and the heating time is 30min, and at the same time, NaOH solution is added dropwise to the mixed solution to reach the pH value 6, then quickly pour the resulting mixture into an impingement flow reactor containing NaF solution, cover the reactor glass cover and react for 1 h, take out the resulting suspension, centrifuge to collect the resulting solid, and wash with deionized water and et...

Embodiment 2

[0056] The preparation method of the micron-scale up-conversion luminescent material described in Example 2 is roughly the same as that in Example 1, except that NaF / Er 3+ is 9:1, Er 3+ / EDTA is 2: 1, the reaction time is 2h, and the reaction temperature is 70°C.

[0057] The particle size and monodispersity analysis result of the product obtained in this embodiment are as follows: Figure 8 As shown, the results show that the particle size of the obtained product is mainly in the range of 0.726-1.325µm, accounting for 16.90% of the total number of particles, the average particle size of the particles is 1.009µm, and has good monodispersity. The yield of the product obtained in this embodiment is 14.56g, and the productive rate is 94.63%.

Embodiment 3

[0059] The preparation method of the micron-scale up-conversion luminescent material described in Example 3 is roughly the same as that in Example 1, except that NaF / Er 3+ is 6:1, Er 3+ / EDTA is 2: 1, the reaction time is 3h, and the reaction temperature is 60°C.

[0060] The particle size and monodispersity analysis result of the product obtained in this embodiment are as follows: Figure 9 As shown, the results show that the particle size of the obtained product is mainly in the range of 0.622-1.163 μm, accounting for 18.76% of the total number of particles, the average particle size of the particles is 0.9650 μm, and has good monodispersity. The yield of the product obtained in this example is 20.46g, and the yield is 99.70%.

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Abstract

The invention discloses a novel micron-scale up-conversion luminescent material, which is a compound with the following chemical formula: NaYF 4 : Yb, Ln, has the advantages of regular particle shape, uniform particle size, and good dispersibility; the present invention also discloses a novel preparation method for preparing micron-scale up-conversion luminescent materials, using impinging flow-precipitation method, the process involved The process is simple, the energy consumption is small, and the product yield is high, the particle size is small and uniformly distributed, and the luminous intensity is good, which can effectively solve the problems of low yield, complex process flow and poor dispersion of up-conversion luminescent materials in the prior art. The method solves the problems that current up-conversion luminescent materials are difficult to mass-produce, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a micron-scale rare earth element co-doped sodium tetrafluoroyttrium up-conversion luminescent material excited by infrared light and a preparation method thereof. Background technique [0002] Up-conversion luminescence refers to the phenomenon of converting two or more low-energy photons into one high-energy photon. It generally refers to the conversion of infrared light into visible light. Its luminescence mechanism is based on two-photon or multi-photon processes. Due to the The small size effect, surface effect, and quantum size effect make them exhibit properties that conventional materials do not have in terms of light, magnetism, and electricity, and can observe certain luminous and optical properties that cannot be seen in individual materials. Rare-earth nano-upconversion luminescent materials have good application prospects in many aspects, es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/85
CPCC09K11/7773
Inventor 李萍陈晨周凯程杰叶恒施易豪徐交
Owner WUHAN INSTITUTE OF TECHNOLOGY
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