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A kind of green fluorescent ceramic material, preparation method and application thereof

A technology of green fluorescent and ceramic materials, applied in luminescent materials, chemical instruments and methods, light sources, etc., can solve the problems of lack of green and red components, poor color reproduction, and cold tones, etc., and achieve pure chroma and production conditions And the equipment requirements are not high, the effect of crystallinity is good

Active Publication Date: 2020-06-09
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used white light LED with mature technology is mainly based on GaN-based chips that emit blue light and YAG:Ce phosphor powder, which is realized by exciting YAG:Ce to emit yellow light and blue light, which has high efficiency and low manufacturing cost. Low, but due to the lack of green and red components in its emission spectrum, especially in the green region, the luminous efficiency is not high, resulting in a relatively low color rendering index, poor color reproduction, and cooler tones, which limits its application. In addition, ordinary fluorescent powder will produce toxic gases such as sulfide under ultraviolet radiation, which poses a threat to the environment, and the cost of its preparation process is also relatively high.

Method used

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  • A kind of green fluorescent ceramic material, preparation method and application thereof
  • A kind of green fluorescent ceramic material, preparation method and application thereof
  • A kind of green fluorescent ceramic material, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] Preparation of Ca 9.9 Tb 0.1 Si 3 o 15 f 2, according to the chemical formula Ca 9.9 Tb 0.1 Si 3 o 15 f 2 The stoichiometric ratio of each element in, weighed calcium carbonate CaCO 3 : 8.908 g, silicon oxide SiO 2 : 1.8024 g, terbium oxide Tb 2 o 3 : 0.0019 g, ground and mixed in an agate mortar, pre-sintered in an air atmosphere, the sintering temperature is 800 ° C, the sintering time is 10 hours, then cooled to room temperature, and the sample is taken out; after grinding and mixing again, the raw material is again mixed with 0.7808 g calcium fluoride CaF 2 Thoroughly mix and grind evenly, press the mixed powder into shape at a pressure of 10 MPa, and calcinate again in an air atmosphere at a calcining temperature of 1200°C for 5 hours, cool naturally, grind and mix evenly to obtain fluorescent ceramics.

[0031] See attached figure 1 , which is the X-ray powder diffraction pattern of the sample prepared by the technical scheme of this embodiment, the ...

Embodiment 2

[0037] Preparation of Ca 9.99 Tb 0.01 Si 3 o 15 f 2 , according to the chemical formula Ca 9.9 Tb 0.1 Si 3 o 15 f 2 The stoichiometric ratio of each element in , respectively weigh calcium hydroxide Ca(OH) 2 : 5.1793 g, silicic acid H 2 SiO 3 : 2.34 g, terbium oxide Tb 2 o 3 : 0.00021 g was ground in an agate mortar and mixed evenly, and then pre-sintered in an air atmosphere. The sintering temperature was 750 ° C, and the sintering time was 10 hours. Then, it was cooled to room temperature, and the sample was taken out; g calcium fluoride CaF 2 Fully mix and grind evenly, press the mixed powder into shape, the pressure is 15MPa, and calcined again in air atmosphere, the calcining temperature is 1200°C, the calcining time is 3 hours, and the fluorescent ceramic material is obtained by natural cooling.

[0038] The sample prepared in this example is similar to Example 1 in its main structural appearance, excitation spectrum, emission spectrum and luminescence deca...

Embodiment 3

[0040] Preparation of Ca 9.5 Tb 0.5 Si 3 o 15 f 2 , according to the chemical formula Ca 9.5 Tb 0.5 Si 3 o 15 f 2 The stoichiometric ratio of each element in , respectively weigh calcium oxalate CaC 2 o 4 : 9.608 g, silicic acid H 2 SiO 3 : 2.34 g, terbium nitrate Tb (NO 3 ) 3 ·6H 2 O: 0.0226 g, after grinding and mixing in an agate mortar, select the air atmosphere for pre-sintering, the sintering temperature is 900 ° C, the sintering time is 6 hours, then cool to room temperature, take out the sample; with 1.5616 g calcium fluoride CaF 2 Fully mix and grind evenly, press and form the mixed powder at a pressure of 12 MPa, and calcinate again in an air atmosphere at a calcining temperature of 1000°C for 9 hours, cool naturally, grind and mix evenly to obtain a fluorescent ceramic material.

[0041] The sample prepared in this example is similar to Example 1 in its main structural appearance, excitation spectrum, emission spectrum and luminescence decay curve. ...

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Abstract

The invention discloses a green fluorescent ceramic material, a preparation method and an application thereof, the chemical formula of which is Ca 10‑10x Tb 10x Si 3 o 15 f 2 , where x is Tb 3+ The stoichiometric fraction of doping, 0.001≤x≤0.20, belongs to the technical field of inorganic luminescent materials. The fluorescent ceramic material prepared by the present invention can be excited by ultraviolet light near 200-380 nanometers, which is very consistent with the emission wavelength of the near-ultraviolet LED chip. Under the excitation of near-ultraviolet light, the fluorescent ceramic can emit bright green fluorescence. The wavelength is mainly 550nm; the obtained fluorescent ceramic material has high luminous efficiency and good chemical stability, and will not produce toxic gases such as sulfide under ultraviolet radiation. Compounds containing elements required for synthesizing biological materials are mixed in proportion, and then calcined by hot pressing. The process is simple, free of any pollution, friendly to the environment, and suitable for industrial production.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a green fluorescent ceramic material, a preparation method and an application thereof, and belongs to the technical field of luminescent materials. Background technique [0002] Under the demand of global energy conservation and emission reduction, energy shortage and strengthening of environmental protection, LED lighting, as the fourth-generation lighting source after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps, is gradually replacing traditional lighting devices. In recent years, it has gradually become a trend to replace traditional incandescent and fluorescent lamps with white LEDs. White LED lighting has shown huge market potential, and its application in indoor, outdoor, automotive lighting and display fields will greatly change the way of life of human beings. According to the forecast of Philips, the proportion of LED lighting in the field of gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/22C04B35/622C09K11/86F21K9/64F21V9/30F21Y115/10
CPCC04B35/22C04B35/622C04B2235/3208C04B2235/3224C04B2235/442C04B2235/443C04B2235/444C04B2235/445C04B2235/448C04B2235/48C04B2235/9646C09K11/7734F21V9/30
Inventor 乔学斌
Owner XUZHOU NORMAL UNIVERSITY
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