Long-afterglow yellow fluorophor and preparation method thereof

A technology of yellow phosphor and long afterglow, applied in the field of materials, can solve the problems of difficult control of finished product quality and complicated preparation process, and achieve the effects of good afterglow luminescence performance, simple preparation method and wide excitation range

Inactive Publication Date: 2009-05-27
孙家跃 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one disadvantage of this type of material is that the preparation process is relatively complicated, and it is not easy to control the quality of the finished product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1 2 (Ca 0.995 Eu 0.005 )O·0.8CaBr 2 0.7SiO2 2 :0.01 Synthesis of Ti material

[0011] Accurately weigh CaCO 3 1.992 g, CaBr 2 2H 2 O1.887g, SiO 2 0.421 g, Eu 2 o 3 0.018 g, TiO 2 0.008 g, H 3 BO 3 0.043 grams. Grind and mix the above raw materials evenly, put them into a corundum crucible, compact them, cover them, and sinter them in two steps. First, pre-sinter at a lower temperature of 500°C for 4 hours, cool to room temperature, take it out and grind it again, and then sinter at 900°C for 6 hours in a carbon-reducing atmosphere to obtain the target phosphor. The material can absorb ultraviolet and visible light well, and has a long-lasting yellow long afterglow luminous effect.

Embodiment 2

[0012] Example 2 2(Ca 0.98 Eu 0.02 )O·0.9CaBr 2 ·SiO2 2 : Synthesis of 0.04Zr material

[0013] Accurately weigh CaCO 3 1.962 g, CaBr 2 2H 2 O2.123g, SiO 2 0.601 g, Eu 2 o 3 0.072 g, ZrO 2 0.049 g, H 3 BO 3 0.086 grams. Grind and mix the above raw materials evenly, put them into a corundum crucible, compact them, cover them, and sinter them in two steps. First, pre-sinter at a lower temperature of 400°C for 5 hours, cool to room temperature, take it out and grind it again, and then sinter at 1100°C for 6 hours in a carbon-reducing atmosphere to obtain the target phosphor. The material can absorb ultraviolet and visible light well, and has a long-lasting yellow long afterglow luminous effect.

Embodiment 3

[0014] Example 3 2(Ca 0.95 Eu 0.05 )O·CaBr 2 ·SiO2 2 : Synthesis of 0.1La material

[0015] Accurately weigh CaCO 3 1.902 g, CaBr 2 2H 2 O2.359 g, SiO 2 0.601 g, Eu 2 o 3 0.176 g, La 2 o 3 0.163 grams. Grind and mix the above raw materials evenly, put them into a corundum crucible, compact them, cover them, and sinter them in two steps. First, pre-sinter at a lower temperature of 500°C for 3 hours, cool to room temperature, take it out and grind it again, and then sinter at 1000°C for 5 hours in a carbon-reducing atmosphere to obtain the target phosphor. The material can absorb ultraviolet and visible light well, and has a long-lasting yellow long afterglow luminous effect.

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Abstract

The provided preparation method for a long-lag yellow fluorophor with nominal constituent as 2(Ca1-xEux)O.mCaBr2.nSiO2:yR (R for Ti, Zr, La, Nd or Dy; all m, n, x and y for mole coefficient, 0.8<=m <=1.2, 0.7<=n<=1.3, 0.005<=x<=0.1, and 0.01<=y<=0.2) comprises: weighing the materials and one of B2O3 or NH4Cl as fluxing agent to grind and mix fully; sintering following two steps: first, pre-sintering for 3-5h at 400-600Deg; then, sintering for 6-8h in carbon reducing atmosphere at 900-1100Deg. This product has wide activation range to absorb UV and visible light, and keeps afterglow luminescent effect for a long time.

Description

technical field [0001] The invention relates to a long afterglow yellow phosphor and a preparation method thereof, belonging to the field of materials. Background technique [0002] Long afterglow luminescent material is a kind of light-induced energy storage functional material, also known as "luminous powder", which is widely used in low-light lighting, emergency instructions, architectural decoration and arts and crafts and other fields. Most of the long-lasting luminescent materials in the past are sulfide-type compounds, such as ZnS:Cu (emitting green light), CaS:Bi (emitting purple-blue light) and CaSrS:Bi (emitting blue light) and other sulfide phosphors. However, the limitation of this type of sulfide phosphor is that the chemical properties are not stable enough, and the light resistance is poor, which limits the application of this type of material. In the 1990s, a new type of Eu 2+ The discovery of long afterglow luminescent materials in the aluminate system wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
Inventor 孙家跃杜海燕夏志国
Owner 孙家跃
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