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Method for preparing blue long afterglow luminescence C12A7 powder

A long afterglow luminescence, dodecacalcium technology, applied in the field of materials, can solve the problem of high synthesis temperature and achieve the effect of wide application prospects

Inactive Publication Date: 2010-03-17
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Luminescent materials based on aluminate have high luminous efficiency, but the synthesis temperature is relatively high, generally reaching 1300-1600°C, even reaching 1700°C

Method used

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  • Method for preparing blue long afterglow luminescence C12A7 powder
  • Method for preparing blue long afterglow luminescence C12A7 powder
  • Method for preparing blue long afterglow luminescence C12A7 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Weigh 0.0114g of Eu with a purity of 99.99% 2 o 3 , 0.0121g with a purity of 99.99% Dy 2 o 3 , dissolved in HNO under heating 3 In, made into nitrate solution;

[0024] 2. the 5.6838g purity is 99.99% Al (NO 3 ) 3 and 3.0669g of 99.99% pure Ca(NO 3 ) 2 The raw materials are dissolved in deionized water according to the chemical dosage ratio;

[0025] 3. Mix the above two solutions evenly and add the precipitating agent NH 3 ·H 2 O, to obtain the gel precursor;

[0026] 4. Dry the obtained gel precursor at 100°C to remove water;

[0027] 5. Put the obtained gel into a high-temperature furnace, sinter in an air atmosphere at 1100°C for 6 hours, cool, grind, and sinter and reduce the obtained powder in an activated carbon reducing atmosphere at 1000°C for 2 hours to obtain 0.5 Calcium heptaaluminate powder co-doped with % europium and 0.5% dysprosium (C12A7: 0.5% Eu, 0.5% Dy).

Embodiment 2

[0029] 1. Weigh 0.0114g of Eu with a purity of 99.99% 2 o 3 , 0.0242g with a purity of 99.99% Dy 2 o 3 , dissolved in HNO under heating 3 In, made into nitrate solution;

[0030] 2. the 5.6838g purity is 99.99% Al (NO 3 ) 3 and 3.0669g of 99.99% pure Ca(NO 3 ) 2 The raw materials are dissolved in deionized water according to the chemical dosage ratio;

[0031] 3. Mix the above two solutions evenly and add the precipitating agent NH 3 ·H 2 O, to obtain the gel precursor;

[0032] 4. Dry the obtained gel precursor at a temperature of 90°C to remove water;

[0033] 5. Put the obtained gel into a high-temperature furnace, sinter in an air atmosphere at 1200°C for 7 hours, cool, grind, and sinter and reduce the obtained powder in an activated carbon reducing atmosphere at 1050°C for 3 hours to obtain 0.5 Calcium heptaaluminate powder co-doped with % europium and 1% dysprosium (C12A7: 0.5% Eu, 1% Dy).

Embodiment 3

[0035] 1. Weigh 0.0114g of Eu with a purity of 99.99% 2 o 3 , 0.0484g with a purity of 99.99% Dy 2 o 3 , dissolved in HNO under heating 3 In, made into nitrate solution;

[0036] 2. the 5.6838g purity is 99.99% Al (NO 3 ) 3 and 3.0669g of 99.99% pure Ca(NO 3 ) 2 The raw materials are dissolved in deionized water according to the chemical dosage ratio;

[0037] 3. Mix the above two solutions evenly and add the precipitating agent NH 3 ·H 2 O, to obtain the gel precursor;

[0038] 4. Dry the obtained gel precursor at a temperature of 120°C to remove water;

[0039] 5. Put the obtained gel in a high-temperature furnace, sinter in an air atmosphere at 1100°C for 8 hours, cool and grind, and sinter and reduce the obtained powder in an activated carbon reducing atmosphere at 1100°C for 4 hours to obtain 0.5 Calcium heptaaluminate powder co-doped with % europium and 2% dysprosium (C12A7: 0.5% Eu, 2% Dy).

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Abstract

The invention belongs to the technical field of materials, in particular a method for controlling and synthesizing rare-earth europium and dysprosium doped long afterglow and photostimulated luminescence. The method comprises the following steps: using a chemical coprecipitation method to prepare gelatin precursor of C12A7 doped with the europium and dysprosium together, dissolving Eu2O3 and Dy2O3in HNO3 under the condition of heating; dissolving raw materials of pure Al(NO3)3 and Ca(NO3)2 in water; after uniformly mixing the solution, adding a precipitator of NH3.H2O; drying, dewatering, sintering, grinding and reducing the obtained gelatin precursor to obtain the C12A7 powder doped with the europium and dysprosium (C12A7: Eu, Dy). The invention realizes the blue long afterglow and the photostimulated luminescence. The result is shown that the C12A7 powder doped with the europium and dysprosium is hopefully used for the fields of dim light luminance, night viewing, an indicator, light storage, light information processing and the like.

Description

Technical field [0001] The invention belongs to the technical field of materials, and specifically relates to the selection of a host material co-doped with europium and dysprosium, the control of long afterglow luminescence and light-excited luminescence and a synthesis method thereof. Background technique [0002] Luminescent materials based on aluminate have high luminous efficiency, but the synthesis temperature is relatively high, generally reaching 1300-1600°C, even reaching 1700°C. At present, the light-storing luminescent materials that have reached the practical level of aluminate system include CaAl, which emits blue-purple light, which is more familiar to people. 2 o 4 :Eu, Nd, Sr emitting blue-green light 4 al 14 o 25 :Eu, Dy and SrAl with yellow-green light 2 o 4 : Eu, Dy, they all have excellent long afterglow luminescence properties. In addition to excellent luminescent properties, long-lasting luminescent materials should also have certain characterist...

Claims

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Application Information

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IPC IPC(8): C09K11/80
Inventor 刘玉学李慧徐长山刘益春宗殿强夏彬
Owner NORTHEAST NORMAL UNIVERSITY
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