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A kind of europium-doped microspherical fluorescent powder and its preparation method

A phosphor and spherical technology is applied in the field of europium doped micro-spherical phosphor and its preparation, which can solve the problems of uneven size, irregular shape, high energy consumption for sintering, and achieve regular morphology, low scattering and simple process. Effect

Active Publication Date: 2021-02-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional high-temperature solid-phase synthesis method is usually used to prepare such phosphors with complex matrix components, but this method has major problems
On the one hand, the preparation process requires high-temperature sintering and sintering and long-term heat treatment, and the energy consumption of sintering is high; on the other hand, the product is severely sintered into coarse particles or dense blocks, which need to be pulverized by ball milling to obtain micron-sized particles, and these particles Usually irregular in shape and uneven in size

Method used

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  • A kind of europium-doped microspherical fluorescent powder and its preparation method
  • A kind of europium-doped microspherical fluorescent powder and its preparation method
  • A kind of europium-doped microspherical fluorescent powder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh 2.0g AlCl 3 ﹒ 6H 2 O, 0.54g CaCl 2 , 0.00178g EuCl 3 ﹒ 6H 2 0 and 0.3mL tetraethyl orthosilicate (TEOS) in a 50ml beaker, add 1mL surfactant formamide (FA), 4mL deionized water and 4mL absolute ethanol to obtain a mixed solution;

[0017] (2) Keep the mixed solution at 25°C for continuous magnetic stirring (1000 revolutions per minute), and wait for the AlCl 3 ﹒ 6H 2 O, CaCl 2 , EuCl 3 ﹒ 6H 2 After O was completely hydrolyzed, 13 mL of propylene oxide (PO) was quickly injected into the mixed solution to drive the gelation reaction;

[0018] (3) Keep stirring rapidly after adding PO, and stop stirring when PO is evenly dispersed. Obtain milky white gel after standing for 5 minutes;

[0019] (4) Put the prepared gel in a Petri dish and dry it in an oven at 80°C for 12 hours to obtain an amorphous precursor;

[0020] (5) Spread the prepared precursor in an alumina burning boat, then place it in a tube furnace and heat it up to 1200°C, and heat it i...

Embodiment 2

[0023] (1) Weigh 2.0g AlCl 3 ﹒ 6H 2 O, 0.54g CaCl 2 , 0.00896g EuCl 3 ﹒ 6H 2 0 and 0.3mL tetraethyl orthosilicate (TEOS) in a 50ml beaker, add 1mL surfactant formamide (FA), 4mL deionized water and 4mL absolute ethanol to obtain a mixed solution;

[0024] (2) Keep the mixed solution at 30°C for continuous magnetic stirring (1000 revolutions per minute), and wait for the AlCl 3 ﹒ 6H 2 O, CaCl 2 , EuCl 3 ﹒ 6H 2 After O was completely hydrolyzed, 12 mL of propylene oxide (PO) was quickly injected into the solution to drive the gelation reaction;

[0025] (3) Keep stirring rapidly after adding PO, and stop stirring when PO is evenly dispersed. Obtain milky white gel after standing for 5 minutes;

[0026] (4) Put the prepared gel in a Petri dish and dry it in an oven at 70°C for 12 hours to obtain an amorphous precursor;

[0027] (5) Spread the prepared precursor in an alumina burning boat, then place it in a tube furnace and heat it up to 1150°C, and heat it in an a...

Embodiment 3

[0030] (1) Weigh 2.0g AlCl 3 ﹒ 6H 2 O, 0.54g CaCl 2, 0.01800g EuCl 3 ﹒ 6H 2 0 and 0.3mL tetraethyl orthosilicate (TEOS) in a 50ml beaker, add 1mL surfactant formamide (FA), 4mL deionized water and 4mL absolute ethanol to obtain a mixed solution;

[0031] (2) Keep the mixed solution at 35°C for continuous magnetic stirring (1000 revolutions per minute), and wait for the AlCl 3 ﹒ 6H 2 O, CaCl 2 , EuCl 3 ﹒ 6H 2 After complete hydrolysis of O, 13 mL of propylene oxide (PO) was quickly injected into the solution to drive the gelation reaction;

[0032] (3) Continue to stir after adding PO, and stop stirring when PO is evenly dispersed. Obtain milky white gel after standing for 5 minutes;

[0033] (4) Put the prepared gel in a Petri dish and dry it in an oven at 80°C for 12 hours to obtain an amorphous precursor;

[0034] (5) Spread the prepared precursor in an alumina burning boat, then place it in a tube furnace and heat it up to 1200°C, and heat it in an ammonia re...

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Abstract

The invention discloses a europium-doped microspherical fluorescent powder and a preparation method thereof. The chemical formula of the fluorescent powder is Ca 2(1‑x) al 2 SiO 7 :2xEu 2+ , wherein: the value range of x is 0.001-0.05; the fluorescent powder has a microspherical structure, and the size of the fluorescent powder is 0.5-5 μm. The phosphor is hydrated AlCl 3 , CaCl 2 , EuCl 3 Using tetraethyl orthosilicate (TEOS) as the raw material, the precursor microspheres were prepared by the sol-gel method driven by propylene oxide at a suitable water-alcohol ratio, and the blue Ca 2 al 2 SiO 7 :Eu 2+ Fluorescent microspheres. The invented spherical phosphor has regular shape, good monodispersity and excellent luminous performance, and can be mixed with epoxy resin and used in LED lighting with ultraviolet LED chips.

Description

technical field [0001] The invention relates to a rare earth element-doped aluminosilicate fluorescent powder and a preparation method thereof, in particular to a Ca 2 Al 2 SiO 7 :Eu 2+ Microspherical fluorescent powder and its preparation method. Background technique [0002] Rare earth element-doped aluminosilicate phosphors excited by ultraviolet light can be widely used in the field of LED lighting and display. At present, the traditional high-temperature solid-phase synthesis method is usually used to prepare such phosphors with complex matrix components, but there are major problems in this method. On the one hand, the preparation process requires high-temperature sintering and sintering and long-term heat treatment, and the energy consumption of sintering is high; on the other hand, the product is severely sintered into coarse particles or dense blocks, which need to be pulverized by ball milling to obtain micron-sized particles, and these particles Usually irreg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
CPCC09K11/7734
Inventor 乔旭升何梦婷樊先平贾剑楠王云鹏
Owner ZHEJIANG UNIV
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