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Rare-earth blue luminescent materials, preparation method and use thereof

A technology for blue fluorescent and fluorescent materials, applied in the field of halophosphate rare earth blue fluorescent materials, can solve the problems of complex preparation method and large fluorescent powder particles by liquid phase co-precipitation method, and achieve good luminous intensity, low cost, and easy operation. Simple and easy effects

Inactive Publication Date: 2007-01-03
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the technical solution in this document does not require ball milling and reduces the sintering temperature, the particles of the fluorescent powder are still relatively large, and the preparation method of the liquid phase co-precipitation method is relatively complicated, which has strict requirements on the pH value and temperature, and the co-current feeding method is very equipment has certain requirements

Method used

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  • Rare-earth blue luminescent materials, preparation method and use thereof
  • Rare-earth blue luminescent materials, preparation method and use thereof
  • Rare-earth blue luminescent materials, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 0.164mol calcium phosphate, 0.008mol europium chloride and 0.80mol ammonium chloride were ball-milled for 1 hour, and the mixture was put into a tube furnace for heat treatment at 800°C under the protection of nitrogen for 1 hour to obtain rare earth blue fluorescent powder. and atomic absorption spectrometry to determine the composition of the resulting fluorescent material, as (Ca 0.984 Eu 0.016 ) 5(PO 4 ) 3 Cl. Wash the powder with double distilled water, filter and dry, measure the fluorescence spectrum of the phosphor with a Cary-E fluorescence spectrometer, as figure 1 As shown, the curve on the left is the excitation spectrum when the monitoring wavelength is 454nm, and the curve on the right is the emission spectrum when the excitation wavelength is 254nm. The emission spectrum of the fluorescent powder is in the wavelength range of 440-470nm (that is, blue light is emitted) (the emission peak is at 454nm), and the relative fluorescence intensity is about 5...

Embodiment 2

[0032] Ball mill 0.161mol of calcium phosphate, 0.017mol of europium chloride and 0.55mol of ammonium fluoride for 1 hour, put the mixture into a tube furnace for heat treatment at 800°C under nitrogen protection for 1 hour, wash the obtained powder with twice distilled water, and filter and dry. Determine the composition of the resulting fluorescent material with X-ray diffractometer and atomic absorption spectrometry, as (Ca 0.966 Eu 0.034 ) 5 (PO 4 ) 3 F. The fluorescence spectrum of the phosphor was measured with a Cary-E fluorescence spectrometer, and the particle size of the phosphor was analyzed with a transmission electron microscope. The results obtained were similar to those in Example 1.

Embodiment 3

[0034] Ball mill 0.163mol of magnesium phosphate, 0.011mol of europium chloride and 0.39mol of ammonium chloride for 1.5 hours, put the mixture into a tube furnace at 850°C for heat treatment under nitrogen protection for 1 hour, wash the obtained powder with twice distilled water, filter and dry. Determine the composition of gained fluorescent material with X diffractometer and atomic absorption spectrometry, be (Mg 0.978 Eu 0.022 ) 5 (PO 4 ) 3 Cl. The fluorescence spectrum of the phosphor was measured with a Cary-E fluorescence spectrometer, and the particle size of the phosphor was analyzed with a transmission electron microscope. The results obtained were similar to those in Example 1.

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Abstract

The blue RE fluorescent material is (M1-x / 2-yRxEuy)5(PO4)3X, where M is alkali earth metal atom(s) Ca, Mg and Ba, R is alkali earth metal atom(s) Li, Nan and K, X is halogen atom F and / or Cl, x is 0-0.005, and y is 0.005-0.05. Its preparation includes the following steps: mixing phosphate of alkali earth metal, europium chloride, optional alkali metal halide and ammonium halide to obtain mixture; heat treatment of the mixture at 800-900 deg.c in inert or reducing atmosphere for 1-2 hr to obtain the blue RE fluorescent material. The blue RE fluorescent material may be used in display and lighting, light converting farm mulching, anti-fake material and paint.

Description

technical field [0001] The present invention relates to a rare-earth blue fluorescent material, its preparation method and application, and more particularly relates to a halophosphate rare-earth blue fluorescent material, its preparation method and application. Background technique [0002] Rare earth blue fluorescent materials are widely used in display and lighting fields, among which some europium-doped halophosphates have been developed. This type of halophosphate is usually sintered at high temperature in a reducing atmosphere. Because the processing temperature is usually high, the sintering of phosphor powder is serious, and it needs multiple ball milling and screening before it can be put into use. These halophosphate phosphors developed in the prior art have disadvantages such as large particle size and difficulty in miniaturization, and their preparation methods are also high in energy consumption and high in cost. [0003] CN1128785A (Chinese patent application ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/85
Inventor 余锡宾许晓琳
Owner SHANGHAI NORMAL UNIVERSITY