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Rear earth green long afterglow luminescent material and preparing process thereof

A long afterglow luminescence, green technology, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as unseen long afterglow performance, and achieve the effects of wide excitation range, simple preparation method and good water resistance

Inactive Publication Date: 2004-09-01
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no reports about the long afterglow performance of the system so far.

Method used

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  • Rear earth green long afterglow luminescent material and preparing process thereof
  • Rear earth green long afterglow luminescent material and preparing process thereof
  • Rear earth green long afterglow luminescent material and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh calcium carbonate (CaCO 3 ) 14.01g, magnesium oxide (MgO) 0.81g, silicon dioxide (SiO 2 ) 4.81g, anhydrous calcium chloride (CaCl 2 )3.33g, europium trioxide (Eu 2 o 3 ) 0.14g, aluminum oxide (Al 2 o 3 ) 0.05g, diboron trioxide (B 2 o 3 ) 0.07g, fully ground in an agate mortar and mixed evenly, then sintered in two steps in the reducing atmosphere of carbon rods: first, pre-sintered at a lower temperature of 400°C for 6 hours, cooled to room temperature, taken out and fully ground again And mix evenly, and sinter at 1000°C for 10 hours. The sample is taken out and ground, then washed with boiling water, filtered and dried to finally obtain the sample, which is analyzed by powder X-ray diffractometer as the main phase of Ca 8 Mg(SiO 2 ) 4 Cl 2 , after ultraviolet irradiation, the sample emits a strong green long afterglow.

Embodiment 2

[0015] Weigh calcium carbonate (CaCO 3 ) 14.01g, magnesium oxide (MgO) 0.81g, silicon dioxide (SiO 2 ) 4.81g, anhydrous calcium chloride (CaCl 2 )3.33g, europium trioxide (Eu 2 o 3 ) 0.28g, gallium trioxide (Ga 2 o 3 ) 0.15g, diboron trioxide (B 2 o 3 ) 0.07g in an agate mortar and thoroughly ground and mixed evenly, and then sintered in two steps in a reducing atmosphere of carbon monoxide (CO): firstly, pre-sintered at a lower temperature of 500°C for 5 hours, cooled to room temperature, and taken out again Fully grind and mix evenly, and sinter at 1100°C for 8 hours. The sample is taken out and ground, then washed with boiling water, filtered and dried to finally obtain the sample, which is analyzed by powder X-ray diffractometer as the main phase of Ca 8 Mg(SiO 2 ) 4 Cl 2 , after ultraviolet irradiation, the sample emits a strong green long afterglow.

Embodiment 3

[0017] Weigh calcium carbonate (CaCO 3 ) 14.01g, magnesium oxide (MgO) 0.81g, silicon dioxide (SiO 2 ) 4.81g, anhydrous calcium chloride (CaCl 2 )3.33g, europium trioxide (Eu 2 o 3 ) 0.56g, lanthanum trioxide (La 2 o 3 ) 0.52g, diboron trioxide (B 2 o 3 )0.07g, after fully grinding and mixing in an agate mortar, in hydrogen (H 2 ) in a reducing atmosphere, sintering in two steps: first, pre-sinter at a lower temperature of 700°C for 4 hours, cool to room temperature, take it out and grind it again and mix it evenly, and sinter at 1200°C for 6 hours. The sample is taken out and ground, then washed with boiling water, filtered and dried to finally obtain the sample, which is analyzed by powder X-ray diffractometer as the main phase of Ca 8 Mg(SiO 2 ) 4 Cl 2 , after ultraviolet irradiation, the sample emits a strong green long afterglow.

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Abstract

The invention relates to a rare earth green long persistence luminescent material which has the following structure, the mole coefficient ratio of the matrix raw material being CaCO3 : MgO : SiO2 : CaCl2 = 7 : 1 : 4 : 1.5, the assisting solvent is B2O3, according to doping molecular fraction, weighing the oxides of Eu2O3 and Ln ions, sufficiently grinding and mixing evenly, carrying out two step sintering in reducing gases, taking out the sample for grinding, scouring, filtering and drying to obtain the final product. The obtained long persistence material has wide agitation range, which can absorb ultraviolet and visible light effectively.

Description

technical field [0001] The invention relates to a rare earth green long afterglow luminescent material and a preparation method thereof. Background technique [0002] The history of long afterglow luminescent materials can be traced back to the 19th century. The traditional long afterglow materials mainly include zinc sulfide (ZnS) and alkaline earth sulfide (MS, M=Ca, Sr) two systems, which are characterized by: 1. Persistent afterglow The time is generally 0.5-2 hours, and the afterglow brightness is low; 2. The chemical stability is poor, it is easy to decompose in the air, and it is easy to turn gray to black under sunlight; therefore, it cannot meet the practical requirements. In order to improve the luminous brightness of the material and prolong the afterglow time, radioactive elements such as Co and Ra are doped. However, due to the environmental and personal unfriendliness of this improved material, its use has been greatly limited. In the 1990s, the discovery of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
Inventor 苏锵王静吕玉华
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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