La O S long persistence phosphorescence material in red color and preparation method

A long afterglow luminescence, red technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problem that the practical application is still far away, and achieve the effect of expanding the scope of application, long afterglow, and easy to obtain

Inactive Publication Date: 2005-01-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yttrium oxide and sulfur are used as matrix materials, sodium carbonate is used as flux, rare earth samarium ions are used as activators, magnesium and titanium ions are used as co-activators, and activated carbon is used as reducing agent. The luminescence performance of this material is far from that of aluminate materials. Needs to be further improved, far from practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 X=0.5%, R is Ti, La 2 o 2 S: Eu, Mg, Ti long afterglow luminescent material

[0015] La 2 o 3 , S, 4MgCO 3 ·Mg(OH) 2 ·5H 2 O, and flux Na 2 CO 3 , Li 2 CO 3 Mix well, then add Eu 2 o 3 Powder and TiO 2 Powder.

[0016] Grind and mix the above ingredients in an ethanol medium and dry them evenly, put them into an alumina crucible, put them into a high-temperature furnace for calcination at 1200°C for 4 hours, cool down, then pulverize the burnt products, wash them with hot water for many times, and sieve them through a 200-mesh sieve. Mesh sieve to prepare example material.

[0017] The material of this example is off-white in appearance. Tested by XRD, it shows that its structure is hexagonal structure, and its main compound is La 2 o 2 S. According to its main compound, determine the chemical expression La of the material 2 o 2 S: Eu, Mg, Ti. After being irradiated by sunlight or ultraviolet rays, an obvious red afterglow can be seen, and...

Embodiment 2

[0018] Embodiment 2, X=0.5%, R is Zr, La 2 o 2 S:Eu, Mg, Zr long afterglow luminescent material

[0019] La 2 o 3 , S, 4MgCO 3 ·Mg(OH) 2 ·5H 2 O, and flux Na 2 CO 3 , Li 2 CO 3 Mix well, then add Eu 2 o 3 Powder and ZrO 2 Powder.

[0020] Grind and mix the above ingredients in ethanol and dry them evenly, put them into an alumina crucible, put them into a high-temperature furnace for calcination at 1200°C for 4 hours, cool down, then crush the burnt products, wash them with hot water several times, and sieve them through a 200-mesh sieve. Mesh sieve to prepare example material.

[0021] The material of this example is off-white in appearance. Tested by XRD, it shows that its structure is hexagonal structure, and its phase composition is La 2 o 2 S. After being irradiated by sunlight or ultraviolet rays, it shows a red afterglow in the dark; when the light source is removed, the material can distinguish the luminous brightness of the human eye (0.32mcd / m 2 ) ...

Embodiment 3

[0022] Example 3 X=4%, R is Zr, La 2 o2 S:Eu, Mg, Zr long afterglow luminescent material

[0023] La 2 o 3 , S, 4MgCO 3 ·Mg(OH) 2 ·5H 2 O, and flux Na 2 CO 3 , Li 2 CO 3 Mix well, then add Eu 2 o 3 Powder and ZrO 2 Powder.

[0024] Grind and mix the above ingredients in an ethanol medium, dry the materials after discharge, put them into an alumina crucible, put them in a high-temperature furnace for calcination at 1200°C for 4 hours, cool down, then pulverize the burnt products, wash with hot water, 200 mesh Screening was carried out to obtain the example material.

[0025] The material of this example is off-white in appearance. Tested by XRD, it shows that its structure is hexagonal structure, and its main compound is La 2 o 2 S. According to its main compound, determine the chemical expression La of the material 2 o 2 S: Eu, Mg, Zr. After being irradiated by sunlight or ultraviolet rays, it shows a red afterglow. When the light source is removed, the mat...

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PUM

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Abstract

The chemical formula of La2O2S red long persistence luminous material is La2O2S:xEu, Mg, R of which X=0.5%-4.0%, R is one of Ti, Zr and Nb. The high temperature solid phase reaction is applied for preparing luminous powder with relevant size by using Eu3+ as ativator; using Mg2+, Zr4+, Ti4+, Nb5+ as coactivator; mixing La2O3, S, 4MgCO3.Mg(OH)2; 5H2O with fluxing agent of Na2CO3 and Li2CO3 sufficiently; adding Eu2O3 and ZrO2 powder for mixed sintering under weak reducing atmosphere and obtaining product through grinding sieving and hot water washing.

Description

technical field [0001] The present invention relates to a red long afterglow luminescent material and its preparation method, especially the rare earth Eu 3+ Excited La 2 o 2 The invention discloses an S red long-lasting luminescent material and a preparation method thereof, which are used in the technical field of luminescent materials. Background technique [0002] In recent years, europium-activated aluminate long-lasting luminescent materials have attracted widespread attention because of their excellent luminescent properties. Currently reported aluminate luminescent materials include rare earth europium (Eu 2+ ) excited CaAl 2 o 4 , SrAl 2 o 4 、Sr 4 al 14 o 25 , SrAl 4 o 7 、BaAl 2 o 4 And other materials, the wavelength of the emitted light is 400nm-530nm, and the afterglow time is about 2000min. The two materials that are practical for production are SrAl 2 o 4 :Eu, Dy, Sr 4 al 14 o 25 :Eu, Dy, afterglow colors are yellow-green and blue-green respe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/84
Inventor 常程康毛大立王璐
Owner SHANGHAI JIAO TONG UNIV
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