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Method for improving long-afterglow characteristics of silicate phosphor powder by means of Li<+> co-doping

A technology of silicate and fluorescent powder, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., and can solve problems such as unreached luminescent performance

Inactive Publication Date: 2017-09-05
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The currently prepared Sr 2 MgSi 2 o 7 :xEu 2+ ,yDy 3+ Long-lasting luminescent materials have the advantages of stable chemical properties and strong water resistance, but the overall luminescent performance has not yet reached the level of aluminate luminescent materials, which largely limits Sr 2 MgSi 2 o 7 :xEu 2+ ,yDy 3+ Further application of long afterglow luminescent materials

Method used

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  • Method for improving long-afterglow characteristics of silicate phosphor powder by means of Li&lt;+&gt; co-doping

Examples

Experimental program
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specific Embodiment approach

[0026] The following will further illustrate the present invention through specific examples, but it is not intended to limit the protection scope of the present invention. Those skilled in the art can make improvements to the preparation method and the equipment used within the scope of the claims, and these improvements should also be considered as the protection scope of the present invention.

[0027]In the following examples, unless otherwise specified, the experimental methods are generally implemented under conventional conditions or conditions suggested by the manufacturer; the raw materials and reagents shown can be obtained through commercially available means.

[0028] The present invention adopts H 3 BO 3 Synthesis of Li by high-temperature solid-state method using co-solvent + Codoped Sr 2 MgSi 2 o 7 :xEu 2+ ,yDy 3+ Four specific examples of phosphor powder are shown in Table 1.

[0029] Table 1 embodiment list of ingredients

[0030]

Embodiment 1

[0031] Example 1 # (Sr 1.955 Li 0.015 Eu 0.01 Dy 0.02 MgSi 2 o 7 ):

[0032] Composition as in Table 1 1 # Shown, specific preparation method comprises the following steps:

[0033] ① Weigh the silicate solid powder raw material SrCO according to the composition in Table 1 3 , SiO 2 , MgO, Li 2 CO 3 、Eu 2 o 3 and Dy 2 o 3 4.58g, 0.797g, 0.1805g, 0.0048g, 0.0685g and 0.1391g respectively;

[0034] ②Add 200ml of H to the raw material in step ① 3 BO 3 mixed as a co-solvent;

[0035] ③ Fully grind the mixture obtained in step ② in an agate mortar for 4 hours;

[0036] ④Calcinate the uniformly mixed powder obtained in step ③ under a weak reducing atmosphere for 2 hours, the calcination temperature is 1100°C, and adding activated carbon will help generate a reducing atmosphere;

[0037] ⑤ Cool the calcined powder to room temperature, and control the particle size of the powder to 120 mesh by grinding;

[0038] The test results are as follows:

[0039] In the pr...

Embodiment 2

[0040] Example 2 # (Sr 1.94 Li 0.02 Eu 0.02 Dy 0.02 MgSi 2 o 7 ):

[0041] Composition as in Table 1 2 # Shown, specific preparation method comprises the following steps:

[0042] ① Weigh the silicate solid powder raw material SrCO according to the composition in Table 1 3 , SiO 2 , MgO, Li 2 CO 3 、Eu 2 o 3 and Dy 2 o 3 8.2761g, 4.333g, 0.3181g, 0.01070g, 0.2425g and 0.2724g respectively;

[0043] ② Add 220ml of H to the raw material in step ① 3 BO 3 mixed as a co-solvent;

[0044] ③ Fully grind the mixture obtained in step ② in an agate mortar for 4 hours;

[0045] ④Calcinate the uniformly mixed powder obtained in step ③ under a weak reducing atmosphere for 2 hours, the calcination temperature is 1270°C, and adding activated carbon will help generate a reducing atmosphere;

[0046] ⑤ Cool the calcined powder to room temperature, and control the particle size of the powder to 130 mesh by grinding;

[0047] The test results are as follows:

[0048] In the ...

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Abstract

The invention provides a method for effectively improving the afterglow intensity of Sr<2>MgSi<2>O<7>:<x>Eu<2+>, <y>Dy<3+> phosphor powder and prolonging the afterglow time of the Sr<2>MgSi<2>O<7>:<x>Eu<2+>, <y>Dy<3+> phosphor powder by means of do-doping by the aid of Li<+>. The method has the advantages that Sr<2+> sites can be replaced by the Li<+> to form Li'Sr with monovalent negative charge during Li<+> co-doping, and accordingly oxygen vacancy with positive charge can be correspondingly generated to complement charge difference and can be used as a trap for capturing electrons and holes in excited states; captured electrons and holes can be gradually released for heat energy and can be recombined with one another, and phosphorescence can be released and is long-afterglow; oxygen vacancy can be continuously increased along with Li<+> doping, captured electrons can be continuously increased, and accordingly the long-afterglow time can be effectively prolonged; the Li<+> is used for compensating charge, and accordingly the charge is in compensation balance when bivalent Sr<2+> is replaced by trivalent Dy<3+>; the Li<+> further can be used as a fluxing agent, the crystallinity of crystals can be effectively improved, the particle sizes of the crystals can be increased, accordingly, crystallization can be improved, and the luminescence intensity of the long-afterglow can be ultimately improved.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, in particular to a Li + Co-doping method to improve the long afterglow characteristics of silicate phosphors, more precisely to provide a method for co-doping Li + Increase Sr 2 MgSi 2 o 7 :xEu 2+ ,yDy 3+ A method for long afterglow characteristics of phosphors. Background technique [0002] Long afterglow phosphor, also known as light-storing phosphor, is essentially a photoluminescent material that absorbs energy such as visible light, ultraviolet light, X-ray, etc., and can continue to emit light at room temperature after the excitation stops. Matter that emits light, which can store energy in energy traps, is a promising material. Phosphor powder with long-lasting luminous properties is an environmentally friendly and energy-efficient material, and has broad application prospects in safety signs, traffic signs and self-luminous processes. [0003] There are th...

Claims

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Application Information

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IPC IPC(8): C09K11/59
CPCC09K11/7792
Inventor 张乐孙炳恒吴佳东单迎双高光珍王骋陈浩
Owner XUZHOU NORMAL UNIVERSITY
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