Orange-red long afterglow powder la2o2s:sm3+ and its preparation

A technology with long afterglow and red light, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as poor moisture resistance, low absorption efficiency, and performance degradation, and achieve low cost, simple production equipment, and strong absorption strength Effect

Inactive Publication Date: 2011-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Y 2 o 2 S:Eu 3+ In addition to the performance of the long afterglow powder in the system is not enough to compare with the blue and green long afterglow powder, there are also disadvantages such as high cost, low absorption efficiency, poor moisture resistance, and significant performance drop at high temperature.

Method used

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  • Orange-red long afterglow powder la2o2s:sm3+ and its preparation
  • Orange-red long afterglow powder la2o2s:sm3+ and its preparation
  • Orange-red long afterglow powder la2o2s:sm3+ and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 0.9286g (0.00285mol) of lanthanum oxide, 0.0522g (0.00015mol) of samarium oxide, and 0.954g (0.009mol) of sodium carbonate, put them in an agate mortar, add a small amount of 99.8% absolute ethanol, mix and grind for 10min, then transfer into a beaker Inside. Then add about 30ml of absolute ethanol with a concentration of 99.8%, use it as a mixing medium, stir by magnetic force for 20 minutes and mix ultrasonically for 10 minutes, after mixing evenly, dry the raw materials in an oven at 60°C for 4 hours. Put the obtained ingredients into an agate mortar, then add 0.48g (0.015mol) of sulfur powder, mix and grind for 10min, and then put the sample evenly into an alumina crucible. Put it into a muffle furnace, sinter in a nitrogen atmosphere, raise the temperature to 1300°C, the heating rate is 3°C / min when it is lower than 800°C, 2°C / min when it is 800-1300°C, and keep it warm for 2 hours at this temperature; finally, in Naturally cool to room temperature under the ...

Embodiment 2

[0037] Take 0.9530g (0.002925mol) of lanthanum oxide, 0.0262g (0.000075mol) of samarium oxide, and 0.954g (0.009mol) of sodium carbonate, put them in an agate mortar, add a small amount of 99.8% absolute ethanol, mix and grind for 15min, and then transfer it into a beaker Inside. Then add about 20ml of absolute ethanol with a concentration of 99.8%, use it as the mixing medium, stir it magnetically for 15 minutes and mix it ultrasonically for 7 minutes, after mixing evenly, dry the raw material in an oven at 70°C for 3 hours. Put the obtained ingredients into an agate mortar, add 0.48 g (0.015 mol) of sulfur powder, mix and grind for 15 min, and then put the sample evenly into an alumina crucible. Put it into a muffle furnace, sinter in a nitrogen atmosphere, raise the temperature to 1250°C, and the heating rate is 4°C / min when it is lower than 800°C, and 3°C / min when it is 800-1250°C. At this temperature, keep it warm for 2 hours; finally, cool it naturally to room temperatu...

Embodiment 3

[0043] Take 0.9628g (0.002955mol) of lanthanum oxide, 0.0157g (0.000045mol) of samarium oxide, and 0.954g (0.009mol) of sodium carbonate, put them in an agate mortar, add a small amount of 99.8% absolute ethanol, mix and grind for 15min, and then transfer them into a beaker Inside. Then add about 40ml of absolute ethanol with a concentration of 99.8%, use it as a mixing medium, stir it by magnetic force for 10 minutes and mix it ultrasonically for 5 minutes, after mixing evenly, dry the raw material in an oven at 80°C for 2 hours. Put the obtained ingredients into an agate mortar, add 0.48g (0.015mol) of sulfur powder, mix and grind for 20min, and then put the sample evenly into an alumina crucible. Put it into a muffle furnace, sinter in a nitrogen atmosphere, and raise the temperature to 1200°C. The heating rate is 5°C / min when it is lower than 800°C, and 2°C / min when it is 800-1200°C. At this temperature, keep it warm for 1 h; finally, cool it naturally to room temperature...

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PUM

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Abstract

The invention relates to orange-red light long-lag powder La2O2S:Sm<3+> and a preparation method thereof. The chemical stoichiometric ratio of La, Sm and S in the long-lag powder is (1.9-1.97):(0.1-0.03):1. The preparation method of the orange-red light long-lag powder La2O2S:Sm<3+> comprises the following steps: (1) placing lanthana, samarium oxide and sodium carbonate into a vessel, then addingabsolute ethyl alcohol to mix uniformly, and drying; (2) adding sulfur powder into the mixture obtained in the step (1), and mixing uniformly; and (3) calcinating the mixture obtained in the step (2)at the atmosphere of nitrogen, then crushing, acid-washing, washing and alcohol leaching the calcinated product, and finally centrifuging and drying to obtain the orange-red light long-lag powder La2O2S:Sm<3+>. Along with the increment of the doping density of Sm ions, the light intensity of the long-lag powder provided by the invention is enhanced gradually; and the preparation method provided by the invention is simple and relatively low in cost, the industrialized production is easy to realize, and the required production equipment is simple.

Description

technical field [0001] The invention belongs to the field of long afterglow powder and its preparation, in particular to an orange-red long afterglow powder La 2 o 2 S:Sm 3+ and its preparation method. Background technique [0002] Long afterglow luminescence means that the material can store the energy of sunlight, fluorescent lamps or other light, and then release the stored energy to emit light in the dark. Because of their energy storage and luminous behavior, they have a wide range of uses in traffic safety signs, lighting facilities for emergencies, aviation and automotive instrument displays, anti-counterfeiting technology, architectural decoration, arts and crafts coatings, etc., and have attracted people's attention. . [0003] People's exploration and research on long afterglow materials began in the early 20th century. The radioactive element radium is used as a luminous substance, but it was discontinued due to its radioactivity. Since people invented Eu ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/84
Inventor 王宏志刘国栋李耀刚张青红
Owner DONGHUA UNIV
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