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Green light type silicate fluorescent powder and preparation method thereof

A silicate and phosphor technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of high color temperature and low color rendering index of white light, and achieve a simple preparation method, no environmental pollution, and easy operation. Effect

Inactive Publication Date: 2013-09-04
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of red light emission, this kind of white light has relatively low color rendering index and high color temperature, which is not ideal for general lighting with large demand

Method used

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  • Green light type silicate fluorescent powder and preparation method thereof
  • Green light type silicate fluorescent powder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the material composition is LiBa 0.995 ScSi 2 o 7 : 0.005Eu 2+

[0017] Press LiBa 0.995 ScSi 2 o 7 : 0.005Eu 2+ In the molar ratio of each element, accurately weigh 0.0005molLi 2 CO 3 , 0.000995molBaCO 3 , 0.0005molSc 2 o 3 , 0.002SiO2 2 and 0.000005mol Eu 2 o 3 High-purity powder raw materials are placed in an agate mortar and ground for about 30 minutes to fully mix the raw materials evenly. Transfer the mixed raw materials to the alumina crucible, add and nest the small corundum crucible in the large crucible with carbon powder, cover it and place it in a high-temperature reaction furnace for sintering at 1100°C for 7 hours, take it out after natural cooling, and grind again In about 15 minutes, a single-phase LiBa can be obtained 0.995 ScSi 2 o 7 : 0.005Eu 2+ Phosphor.

Embodiment 2

[0018] Embodiment 2: material composition is NaBa 0.97 ScSi 2 o 7 : 0.03Eu 2+

[0019] by NaBa 0.97 ScSi 2 o 7 : 0.03Eu 2+ In the molar ratio of each element, accurately weigh 0.001molNaHCO 3 , 0.00097molBaCO 3 , 0.0005molSc 2 o 3 , 0.002SiO2 2 and 0.00003mol Eu 2 o 3 High-purity powder raw materials are placed in an agate mortar and ground for about 30 minutes to fully mix the raw materials evenly. Transfer the mixed raw materials to the alumina crucible, add and nest the small corundum crucible in the large crucible with carbon powder, cover it and place it in a high-temperature reaction furnace for sintering at 1250°C for 5 hours, take it out after natural cooling, and grind again About 15 minutes to get single-phase NaBa 0.97 ScSi 2 o 7 : 0.03Eu 2+ Phosphor.

Embodiment 3

[0020] Embodiment 3: material composition is KBa 0.92 ScSi 2 o 7 : 0.08Eu 2+

[0021] by NaBa 0.92 ScSi 2 o 7 : 0.08Eu 2+ In the molar ratio of each element, accurately weigh 0.001molKOH, 0.00092molBaCO 3 , 0.0005molSc 2 o 3 , 0.002SiO2 2 and 0.00008mol Eu 2 o 3 High-purity powder raw materials are placed in an agate mortar and ground for about 30 minutes to fully mix the raw materials evenly. Transfer the mixed raw materials to the alumina crucible, add and nest the small corundum crucible in the large crucible with carbon powder, cover it and place it in a high-temperature reaction furnace for sintering at 1200°C for 6 hours, take it out after natural cooling, and grind again About 15 minutes to get single-phase KBa 0.92 ScSi 2 o 7 : 0.08Eu 2+ Phosphor.

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Abstract

The invention relates to green light type silicate fluorescent powder and a preparation method thereof. The chemical composition formula of a fluorophor is as follows: MBa (1- x) ScSi2O7: xEu<2+> (wherein M is one of Li, Na and K, and x is not smaller than 0.005 and not larger than 0.2). Oxide, hydroxide or corresponding salt in the structural formula is selected as a raw material, the fluorescent powder is prepared with a solid-phase synthesis method under a reducing atmosphere, and that is, the raw material is calcinated at the temperature of 1100-1300 DEG C for 3-8 hours under the condition that carbon monoxide is taken as the reducing atmosphere, so that a fluorescent material is obtained. The fluorescent material has good luminescence characteristics, stability and chromaticity, and is a novel multicolor fluorescent powder applicable to white light LED devices. Besides, the fluorescent powder prepared with the method is high in purity, simple, mild, easy to operate and free from environmental pollution.

Description

technical field [0001] The invention relates to a green-light silicate fluorescent powder and a preparation method thereof Background technique [0002] White LED is a new type of solid-state lighting source. Compared with traditional lighting sources, it has the advantages of long life, small size, energy saving and environmental protection. The current mainstream white LED technology is to use InGaN blue LED chip and yellow YAG phosphor, and use the blue chip to excite the YAG phosphor to produce yellow light complementary to the blue light, which is mixed to obtain white light. This method has the advantages of simple structure, high luminous efficiency and good brightness, and the process conditions are relatively mature. However, due to the lack of red light emission, this white light has a relatively low color rendering index and high color temperature, which is not ideal for general lighting that is in high demand. In order to overcome this shortcoming, a near-ultra...

Claims

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Application Information

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IPC IPC(8): C09K11/79H01L33/50
CPCY02B20/00
Inventor 夏志国柳成荫周珺张园园
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)