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Dual core-shell fluorescent material and preparation method thereof

A fluorescent material and core technology, applied in the field of core-shell structure fluorescent powder and its preparation, can solve the problems of poor thermal stability, difficulty in effective excitation in the visible light region, etc., and achieve improved electrical conductivity, excellent luminous performance, and high luminous intensity. Effect

Inactive Publication Date: 2012-01-11
罗棋
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In fact, among the various types of fluorescent materials described in other existing patents that have been authorized or are applying for patents, the excitation spectrum of aluminate fluorescent materials is difficult to achieve effective excitation in the visible light region; while silicate or halogen silicon Acid-based fluorescent materials are slightly worse in terms of thermal stability

Method used

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  • Dual core-shell fluorescent material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] 0.6Ba 2 Si 2 o 9 0.2SrF 2 :0.005HoSiO 2 Ag 0.00175

[0028] Dissolve 0.2g of PVP in 10mL of deionized water, stir for 15min, add 7mL to a concentration of 1×10 -3 mol / L Ag particle solution, stirred for 12h. Take the above-mentioned surface-treated Ag particle solution, and use the StOber method to coat the metal nanoparticles with SiO 2 , that is, 25 mL of absolute ethanol, 6 mL of ammonia water, 1 mL of tetraethyl orthosilicate (TEOS) and 5 mL of deionized water were added respectively, and the reaction was stirred for 6 h. Then add the Ba(NO 3 ) 2 Solution, SiO 2 , Sr(NO 3 ) 2 solution and holmium nitrate solution, stirred for 15 minutes, then added dropwise 15mL of 1M oxalic acid solution and HF in a stoichiometric ratio, and stirred for 15 minutes. Use ammonia water to adjust the pH value to 5, then stir for 10 min, filter the precipitate, wash the precipitate with deionized water, and dry.

[0029] The dried powder was ground, then sintered in air at...

Embodiment 2

[0032] 0.8Ba 2 Si 2 o 9 0.35SrF 2 :0.01HoSiO 2 Au 0.002

[0033] Dissolve 0.2g of PVP in 10mL of deionized water, stir for 15min, add 8mL to a concentration of 1×10 -3 mol / L Au particle solution, stirred for 12h. Take the above-mentioned surface-treated Au particle solution, and use the StOber method to coat metal nanoparticles with SiO 2 , that is, 25 mL of absolute ethanol, 6 mL of ammonia water, 1 mL of tetraethyl orthosilicate (TEOS) and 5 mL of deionized water were added respectively, and the reaction was stirred for 6 h. Then add the Ba(NO 3 ) 2 Solution, SiO 2 , Sr(NO 3 ) 2 solution and holmium nitrate solution, stirred for 15 minutes, then added dropwise 15mL of 1M oxalic acid solution and HF in a stoichiometric ratio, and stirred for 15 minutes. Use ammonia water to adjust the pH value to 5, then stir for 10 min, filter the precipitate, wash the precipitate with deionized water, and dry.

[0034] The dried powder was ground, then sintered in air at 140°C...

Embodiment 3

[0036] 0.7Ba 2 Si 2 o 9 0.45SrF 2 :0.07HoSiO 2 PD 0.0004

[0037] Dissolve 0.2g of PVP in 10mL of deionized water, stir for 15min, add 4mL to a concentration of 1×10 -3 mol / L Pd particle solution, stirred for 12h. Take the above-mentioned surface-treated Pd particle solution, and use the StOber method to coat metal nanoparticles with SiO 2 , that is, 25 mL of absolute ethanol, 6 mL of ammonia water, 1 mL of tetraethyl orthosilicate (TEOS) and 5 mL of deionized water were added respectively, and the reaction was stirred for 6 h. Then add the Ba(NO 3 ) 2 Solution, SiO 2 , Sr(NO 3 ) 2 solution and holmium nitrate solution, stirred for 15 minutes, then added dropwise 15mL of 1M oxalic acid solution and HF in a stoichiometric ratio, and stirred for 15 minutes. Use ammonia water to adjust the pH value to 5, then stir for 10 min, filter the precipitate, wash the precipitate with deionized water, and dry.

[0038] The dried powder was ground, then sintered in air at 130°...

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Abstract

The invention relates to a dual core-shell fluorescent material, the chemical composition expression of which is aBa2Si2O9,dSrF2:xHo@SiO2@My, wherein, a is no less than 0.5 and no more than 1.0, d is no less than 0 and no more than 0.5, x is no less than 0.001 and no more than 0.1, y is more than 0 and no more than 0.02, @ means cladding, M is a core, SiO2 is an intermediate shell layer, and aBa2Si2O9,dSrF2:xHo is an outer shell layer. A metallic particle cladded core-shell luminescent material prepared in the invention enables internal quantum efficiency to be improved and luminous intensity to be strengthened and has good stability. The luminescent material has controllable dimension and morphology and a spherical morphology with high bulk density which is applicable to improving the effect of displaying.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a fluorescent powder with a core-shell structure and a preparation method thereof. Background technique [0002] The development of display and lighting technology has brought tremendous changes to human life, especially the emergence of white LEDs, which is a substantial step forward from the identification function to the lighting function of LED. White LEDs are closest to sunlight and can better reflect the true color of the illuminated objects. Because it also has the distinctive characteristics of no pollution, long life, vibration resistance and impact resistance, from a technical point of view, white light LED is undoubtedly the most cutting-edge technology of LED, and will become a new generation of light source in the 21st century - the fourth generation of electric light source. The application market of white LED will be very extensive. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): C09K11/61C09K11/02
Inventor 罗棋
Owner 罗棋
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