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Fluorosilicate-based red fluorescent ceramic material, and preparation method and application thereof

A technology of red fluorescence and ceramic materials, applied in luminescent materials, chemical instruments and methods, sustainable buildings, etc., can solve the problems of lack of green and red components, poor color reproduction, low luminous efficiency, etc., and achieve pure and large chromaticity. Application value and effect of broad application prospects

Active Publication Date: 2017-07-14
NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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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. The cost is low, but due to the lack of green and red components in its emission spectrum, especially in the red region, the luminous efficiency is not high, resulting in a relatively low color rendering index, poor color reproduction, and cooler tones, which limit its application. , and the cost of its preparation process is also relatively high

Method used

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  • Fluorosilicate-based red fluorescent ceramic material, and preparation method and application thereof
  • Fluorosilicate-based red fluorescent ceramic material, and preparation method and application thereof
  • Fluorosilicate-based red fluorescent ceramic material, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] Preparation of Ca 9.9 Eu 0.1 Si 3 o15 f 2 , according to the chemical formula Ca 9.9 Eu 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, europium oxide Eu 2 o 3 : 0.0018 g, ground in an agate mortar and mixed evenly, then sintered in an air atmosphere, the calcination temperature was 800°C, the calcination time was 10 hours, then cooled to room temperature, the sample was taken out and ground evenly; the calcined raw material was again mixed with 0.7808 g calcium fluoride CaF 2 Thoroughly mix and grind evenly, press the mixed powder into shape, pressure is 10MPa, calcined again in air atmosphere, calcining temperature is 1200°C, calcining time is 5 hours, naturally cool and grind and mix evenly to obtain calcium fluorosilicate fluorescent ceramics.

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

Embodiment 2

[0037] Preparation of Ca 9.99 Eu 0.01 Si 3 o 15 f 2 , according to the chemical formula Ca 9.9 Eu 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, europium oxide Eu 2 o 3 : 0.0002 g was ground in an agate mortar and mixed evenly, then sintered in an air atmosphere, the calcination temperature was 950°C, and the calcination time was 3 hours, then cooled to room temperature, and the sample was taken out, ground and mixed evenly; the calcined raw material was again mixed with 2.3424 g Calcium fluoride (CaF) 2 Thoroughly mix and grind evenly, press the mixed powder into shape, the pressure is 15MPa, calcined again in air atmosphere, calcining temperature is 900°C, calcining time is 15 hours, natural cooling and grinding are uniform to obtain calcium fluorosilicate fluorescent ceramics.

[0038] The sample prepared in this example is similar to Example 1 in its ma...

Embodiment 3

[0040] Preparation of Ca 9.5 Eu 0.5 Si 3 o 15 f 2 , according to the chemical formula Ca 9.5 Eu 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, europium nitrate Eu (NO 3 ) 3 ·6H 2 O: 0.0169 g, after grinding and mixing in an agate mortar, select the air atmosphere for sintering, the calcination temperature is 900 ° C, the calcination time is 6 hours, then cool to room temperature, take out the sample; CaF 2 Mix well and grind evenly, press the mixed powder to shape at a pressure of 12 MPa, and calcinate again in an air atmosphere at a calcining temperature of 1000°C, for a calcining time of 9 hours, and naturally cool to obtain calcium fluorosilicate fluorescent ceramics.

[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 fluorosilicate-based red fluorescent ceramic material, and a preparation method and application thereof, and belongs to the technical field of inorganic luminescent materials, wherein a chemical formula of the material is Ca<10-10x>Eu<10x>Si<3>O<15>F<2>, and x is a stoichiometric fraction of a Eu<3+> dopant, and satisfies the relation of 0.001<=X<=0.20. The fluorosilicate-based red fluorescent ceramic material prepared by the invention can be effectively excited by near ultraviolet light and blue light near 200 to 500 nanometers, which is very consistent with an emission wavelength of a near-ultraviolet LED chip; and the fluorescent ceramic material can emit bright red fluorescence under the near ultraviolet light excitation, and has a broad excitation spectrum and luminescence spectrum, and the emission wavelength is mainly 617 nanometers. The fluorosilicate-based red fluorescent ceramic material is high in luminous efficiency and good in chemical stability, does not produce toxic gases such as sulfides and the like under ultraviolet radiation, is environmentally friendly, and can be applied to a white light LED and other light-emitting fields. Compounds containing elements required for the synthesis of the biological material are mixed in proportion, a high temperature solid state method is used for preparation, and the preparation process of the fluorosilicate-based red fluorescent ceramic material is simple, free from any pollution, environmentally friendly, and suitable for industrial production.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a fluorosilicate-based red fluorescent ceramic material, a preparation method and application, 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...

Claims

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Application Information

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IPC IPC(8): C09K11/61C04B35/22C04B35/622H01L33/50
CPCC04B35/22C04B35/622C04B2235/3208C04B2235/3224C04B2235/3418C04B2235/445C09K11/7734H01L33/502Y02B20/00
Inventor 乔学斌
Owner NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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