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Green fluorescent ceramic material, and preparation method and applications thereof

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

Active Publication Date: 2017-07-04
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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  • Green fluorescent ceramic material, and preparation method and applications thereof
  • Green fluorescent ceramic material, and preparation method and applications thereof
  • Green fluorescent ceramic material, and preparation method and applications thereof

Examples

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Comparison scheme
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, and a preparation method and applications thereof, and belongs to the technical field of organic fluorescent material. The chemical formula of the green fluorescent ceramic material is Ca<10-10x>Tb<10x>Si<3>O<15>F<2>, wherein x is used for representing Tb<3+> doping chemometry percentage, and 0.001<=x<=0.20. Excitation of the green fluorescent ceramic material can be realized by ultraviolet light with a wavelength of about 200 to 380nm, the emission wavelength is anastomotic with that of near ultraviolet LED chips; under near ultraviolet excitation, the green fluorescent ceramic material is capable of emitting bright green fluorescence, and the emission wavelength is most 550nm; the green fluorescent ceramic material is high in luminous efficiency and chemical stability; no toxic gas such as sulfide is generated under ultraviolet radiation; the green fluorescent ceramic material is friendly to the environment, can be applied in the fields such as white light LED and other fluorescent areas; in preparation, compounds containing elements needed by the synthesis biological material are mixed at a certain ratio, and hot pressing calcining is carried out; the preparation method is simple; no pollution is caused; and the preparation method is friendly to the environment, and is suitable for industrialized 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 Applications(China)
IPC IPC(8): C04B35/22C04B35/622C09K11/86F21K9/64F21V9/16F21Y115/10
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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