Red long-afterglow luminescent material and preparation method thereof

A long afterglow luminescence, red technology, applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of short afterglow time, low luminescence brightness, complex process, etc., and achieve long afterglow time, high brightness, and stable physical and chemical properties. Effect

Inactive Publication Date: 2014-07-16
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline earth titanate system red long afterglow material is non-polluting, but its luminous brightness is low and afterglow time is short
Phosphate system red long afterglow materials are low in cost, but most of them need reducing atmosphere protection and complicated process for preparation
In addition, some red long afterglow materials use heavy metal elements such as chromium, cadmium, and manganese as activators, which will also cause environmental pollution

Method used

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  • Red long-afterglow luminescent material and preparation method thereof
  • Red long-afterglow luminescent material and preparation method thereof
  • Red long-afterglow luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of red long-lasting luminescent material (Ca 0999 PR 0001 ) 2 Nb 2 o 7 :

[0035] (1) Weigh raw material CaCO 3 7.9991g, Pr 6 o 11 0.0136g, Nb 2 o 5 10.6277g, the above raw materials are all analytically pure, put into an agate mortar and add 30g of absolute ethanol to grind for 2 hours, then dry in an oven at 60°C;

[0036] (2) Place the dried mixed powder in an alumina crucible and pre-fire it at 900°C for 4 hours in an air atmosphere;

[0037] (3) Calcining the ground calcined powder at 1350° C. for 4 hours in an air atmosphere;

[0038] (4) Grind the cooled product into powder to obtain the chemical composition (Ca 0999 PR 0001 ) 2 Nb 2 o 7 red long afterglow luminescent material.

[0039] The appearance of the red long-lasting luminescent material prepared in this embodiment is white, and the X-ray powder diffraction (XRD) test results are as follows: figure 1 Shown, the diffraction peak data of the obtained product and Ca 2 Nb 2 o 7...

Embodiment 2

[0041] Preparation of red long-lasting luminescent material (Ca 099 PR 0001 ) 2 Nb 2 o 7 :

[0042] (1) Weigh raw material CaCO 3 7.9270g, Pr 6 o 11 0.0136g, Nb 2 o 5 10.6277g, the above raw materials are all analytically pure, put into an agate mortar and add 30g of absolute ethanol to grind for 2 hours, then dry in an oven at 60°C;

[0043] (2) Place the dried mixed powder in an alumina crucible and pre-fire it at 900°C for 4 hours in an air atmosphere;

[0044] (3) Calcining the ground calcined powder at 1350° C. for 4 hours in an air atmosphere;

[0045] (4) Grind the cooled product into powder to obtain the chemical composition (Ca 0.99 PR 0001 ) 2 Nb 2 o 7 red long afterglow luminescent material.

[0046] The appearance of the red long-lasting luminescent material prepared in this embodiment is white, and the X-ray powder diffraction (XRD) test results show that the diffraction peak data of the obtained product is similar to that of Ca 2 Nb 2 o 7 The d...

Embodiment 3

[0048] Preparation of red long-lasting luminescent material (Ca 0945 Sr 005 PR 0002 Gd 0003 ) 2 Nb 2 o 7 :

[0049] (1) Weigh raw material CaCO 3 7.7592g, Sr 2 CO 3 0.5899g, Pr 6 o 11 0.0272g, Gd 2 o 3 0.0869g, Nb 2 o 5 10.6277g, the above raw materials are analytically pure, put into an agate mortar and add 35g of deionized water to grind for 2.5 hours, then dry in an oven at 70°C;

[0050] (2) Place the dried mixed powder in an alumina crucible and pre-burn it at 850°C for 5 hours in an air atmosphere;

[0051] (3) Calcining the ground calcined powder at 1300° C. for 8 hours in an air atmosphere;

[0052] (4) Grind the cooled product into powder to obtain the chemical composition (Ca 09-15 Sr 005 PR 0002 Gd 0003 ) 2 Nb 2 o 7 red long afterglow luminescent material.

[0053] The appearance of the red long-lasting luminescent material prepared in this embodiment is white, and the X-ray powder diffraction (XRD) test results are as follows: figure 1 Show...

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PUM

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Abstract

The invention relates to a red long-afterglow luminescent material and a preparation method thereof. The chemical expression of the red long-afterglow luminescent material is (Ca1-x-y-a-b-delta SrxBay)2Nb2O7:Pra, Rb, wherein x is more than or equal to 0 and less than or equal to 0.2, y is more than or equal to 0 and less than or equal to 0.1, a is less than or equal to 0.03 and more than 0, b is more than or equal to 0 and less than or equal to 0.03, delta is more than or equal to 0 and less than or equal to 0.1, and R expresses a rare earth element and selected from one or more of La, Nd, Sm, Eu, Gd, Yb and Lu. The red long-afterglow luminescent material is synthesized in the air by adopting a high-temperature solid phase method, the red long-afterglow luminescent material has obvious red long-afterglow characteristic after being activated by ultraviolet light or sunlight, an emission peak is positioned on a 614-nanometer position, and the longest afterglow observable time exceeds 30 minutes in a dark place under naked eyes. The preparation method disclosed by the invention is simple and easy to operate and can be used for large-scale production without a reducing atmosphere. The red long-afterglow luminescent material disclosed by the invention has the advantages of stability in physicochemical property, high brightness, good monochromaticity and long afterglow time and belongs to an environment-friendly material; according to the red long-afterglow luminescent material, the matrix elements, namely Ca, Sr, Ba, Nb and O, are all tellurian rich elements, and only a small quantity of rare earth elements are adopted, so that no physical injury and environmental pollution are generated in the production and usage of the material.

Description

technical field [0001] The invention relates to a long afterglow luminescent material and a preparation method thereof, in particular to a long afterglow luminescent material which can emit red light after being excited by ultraviolet light or sunlight, has high monochromaticity and high brightness, and a preparation method thereof, belonging to luminescent materials technology field. Background technique [0002] Long afterglow luminescent material is a kind of photoinduced energy storage material, which can absorb and store external light energy, and emit visible light in the dark. It has the advantages of safety, pollution-free, energy saving, and recyclable use. Related researches in the fields of lighting, architectural decoration, arts and crafts, information storage, and high-energy ray detection have gradually attracted people's attention. The existing long-lasting luminescent materials in the visible light region are mainly divided into blue, yellow-green and red l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
Inventor 张君诚韩文鹏龙云泽孟超张国首沙友正曹敏邵阳辛星
Owner QINGDAO UNIV
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