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Rare earth nano silicate red phosphor and its preparation method

A nano-silicate, red fluorescence technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of decreased luminous intensity, large particles and complex processes, and achieve improved luminous intensity, stable optical performance, and simple process. Effect

Inactive Publication Date: 2005-11-30
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are mainly disadvantages such as complex process, high energy consumption, high cost, large particles, and easy absorption of water and carbon dioxide in the air, resulting in a decrease in luminous intensity.

Method used

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  • Rare earth nano silicate red phosphor and its preparation method
  • Rare earth nano silicate red phosphor and its preparation method
  • Rare earth nano silicate red phosphor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 3.77g Y 2 o 3 and 0.1056g Eu 2 o 3 Dissolve in 66% nitric acid under magnetic stirring, distill off water and excess nitric acid under reduced pressure at 70°C, then add 30ml ethanol and stir to obtain a clear and transparent solution, add 1.0g SiO 2 For airgel, stir magnetically at 65°C for 90 minutes to obtain a transparent sol, distill off ethanol under reduced pressure under stirring to obtain a powder solid, transfer it to a muffle furnace for sintering at 600°C for 3 hours to obtain the product. See XRD diagram figure 1 , in the figure, *β-Y 2 Si 2 o 7 : Eu (monoclinic center), +δ-Y 2 Si 2 o 7 : Eu (orthogonal primary), sample TEM picture see figure 2 , the excitation and emission spectra of the sample at 600°C are shown in image 3 . Detected by transmission electron microscope (Hitachi H-80), the average particle size of rare earth nano silicate red phosphor is about 60-80nm. With 60W xenon lamp as excitation source at room temperature, using VARAI...

Embodiment 2

[0035] 3.77g Y 2 o 3 and 0.1056g Eu 2 o 3 Dissolve in 37% hydrochloric acid under magnetic stirring, distill off water and excess hydrochloric acid at 70°C under reduced pressure, then add 30ml ethanol and stir to obtain a clear and transparent solution, add 1.0g SiO 2 For airgel, stir magnetically at 65°C for 90 minutes to obtain a transparent sol, distill off ethanol under reduced pressure under stirring to obtain a powder solid, transfer it to a muffle furnace for sintering at 600°C for 3 hours to obtain the product.

Embodiment 3

[0037] 3.77g Y 2 o 3 and 0.1056g Eu 2 o 3 Dissolve in 37% hydrochloric acid under magnetic stirring, distill off water and excess hydrochloric acid at 70°C under reduced pressure, then add 30ml ethanol and stir to obtain a clear and transparent solution, add 1.0g SiO 2 For airgel, stir magnetically at 65°C for 20 minutes, then ultrasonically disperse for 30 minutes, then stir magnetically at 65°C for 30 minutes to obtain a transparent sol, then distill ethanol under reduced pressure under stirring to obtain a powder solid, then transfer to a muffle furnace and sinter at 600°C for 3 hours to obtain the airgel. product.

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Abstract

The invention discloses a rare-earth nanometer metasilicate red fluorophor and the method for preparation. It contains the following setups: dissolving sensitizer activator substrate yttrium oxide in norbiline (or azotic acid), pressure-reduced distilling to eliminate water and excess acid, adding alcohol to prepare clear and transparent solution, and adding substrate silicon material to prepare transparent sol, pressure-reduced distilling to eliminate alcohol and acquiring powder solid, and adglutinating in 550-750 Deg. C by 2-4 hours to prepare the product. It prepares rare-earth nanometer red fluorescent powder in a low temperature (600 Deg. C) and a short time (3 hours), the average grain diameter being about 60-80 nm, the luminous intensity strong, chemical and optical property stable, the material easily obtained and cheap. Chemical expression formula of the rare-earth nanometer red fluorescent powder is as following: (YxSiy0z: Euj, Mn.

Description

technical field [0001] The invention relates to a rare earth luminescent material and a preparation method thereof, in particular to a rare earth nano silicate red phosphor and a preparation method thereof. Background technique [0002] Y 2 o 3 : Eu is a commonly used rare earth red phosphor, because the phosphor can absorb ultraviolet light around 254nm and emit red light around 611nm, and has strong absorption capacity and high conversion rate, it is used in lighting, display, and solar energy. It is an extremely useful luminescent material. This material is usually prepared by high-temperature solid-phase method, which requires a high processing temperature (about 1400 ° C) and a long reaction time (tens of hours), and the phosphor powder is seriously sintered, requiring multiple ball milling and multiple sintering sieves. It can be applied only after the points. There are mainly disadvantages such as complex process, high energy consumption, high cost, large particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
Inventor 余锡宾周平乐
Owner SHANGHAI NORMAL UNIVERSITY
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