YAG fluorescent ceramic as well as preparation method and application thereof

A technology of fluorescent ceramics and luminescent centers, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as poor thermal conductivity, high color temperature, and reduced luminous efficiency, so as to facilitate industrial production, promote densification, and avoid light Fading effect

Inactive Publication Date: 2018-09-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yttrium aluminum garnet (YAG:Ce) phosphor only contains yellow light components and lacks red and green light, which will lead to low color rendering index and high color temperature of white LEDs; at the same time, the resin used to encapsulate the phosphor is thermally conductive Poor performance, difficult heat dissipation, as the use time of white LEDs prolongs, it will cause light decay of white LEDs and reduce luminous efficiency
In addition, the traditional two-step method to prepare YAG fluorescent ceramics needs to first synthesize YAG fluorescent powder and then sinter YAG fluorescent ceramics, which has certain limitations in terms of energy saving and efficiency.

Method used

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  • YAG fluorescent ceramic as well as preparation method and application thereof
  • YAG fluorescent ceramic as well as preparation method and application thereof
  • YAG fluorescent ceramic as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0094] α-alumina (α-Al 2 o 3 ), yttrium oxide (Y 2 o 3 ), cerium oxide (CeO 2 ), chromium trioxide (Cr 2 o 3 ) is the reaction raw material, with magnesium oxide (MgO) and tetraethyl orthosilicate (TEOS) as the sintering aid; according to (Y 1-0.02 Ce 0.02 ) 3 (Al 1- 0.0003 Cr 0.0003 ) 5 o 12 Strictly calculate the mass required for each raw material and accurately weigh a total of 10g of mixed powder raw materials, and add sintering aids 0.05wt% MgO (the total mass of mixed powder raw materials is the base) and 0.5wt% TEOS (mixed powder The total mass of bulk raw materials is the base number). Using absolute ethanol (mass ratio EtOH: mixed powder raw material = 1:1) as the medium, use alumina ball milling, dry the slurry (rotary evaporator first evaporates to remove the organic solvent, and then moves to 80 ° C for drying Keep drying in the box for 5h), sieve (the mesh number of the sieve is 200 mesh) to obtain the mixed powder. After dry pressing (15MPa), the ...

Embodiment 2

[0096] Adopt and prepare with the preparation method in embodiment 1 (Y 1-0.004 Ce 0.004 ) 3 (Al 1-0.0003 Cr 0.0003 ) 5 o 12 Fluorescent ceramics, the ceramics are marked as 2#.

Embodiment 3

[0098] Adopt and prepare with the preparation method in embodiment 1 (Y 1-0.006 Ce 0.006 ) 3 (Al 1-0.0003 Cr 0.0003 ) 5 o 12 Fluorescent ceramics, the ceramics are marked as 3#.

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Abstract

The invention discloses a YAG fluorescent ceramic as well as a preparation method and application thereof. Light-emitting center ions of the YAG fluorescent ceramic comprise Ce<3+> and M capable of emitting red light/green light; the molecular formula is (Y1-xCex)3(Al1-yMy)5O12, wherein x is greater than or equal to 0.004 and is less than or equal to 0.5, and y is greater than 0 and is less than or equal to 0.5. The preparation method of the YAG fluorescent ceramic comprises the following steps: uniformly mixing powder of raw materials, molding to prepare biscuits and carrying out high-temperature solid-phase synthesis reaction sintering to prepare the YAG transparent ceramic. After rare earth-doped YAG transparent ceramic is encapsulated with a commercial blue light LED chip, high-qualityemitted light capable of simulating sunlight can be obtained; compared with the rare earth-doped YAG transparent ceramic prepared by a two-step method, the step of synthesizing YAG:Ce<3+>, M fluorescent powder is avoided in the reaction sintering method; the preparation method has the characteristics of simple process and low production cost.

Description

technical field [0001] The application relates to a YAG fluorescent ceramic and its preparation method and application, and belongs to the field of fluorescent materials and its preparation method. Background technique [0002] White light LED is known as a new generation of green solid-state lighting source, which has the advantages of energy saving, high efficiency, environmental protection, instant start, etc., and has a long service life. The currently widely used white light LED technology is to encapsulate yttrium aluminum garnet (YAG:Ce) phosphor powder on the basis of GaN-based blue light chips. Under the excitation of the blue light chip, the yellow light emitted by the phosphor powder is mixed with blue light to form white light. However, the yttrium aluminum garnet (YAG:Ce) phosphor only contains yellow light components and lacks red and green light, which will lead to low color rendering index and high color temperature of white LEDs; at the same time, the resin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/44C09K11/80C09K11/82H01L33/50
CPCC04B35/44C04B35/505C04B2235/3229C04B2235/442C04B2235/443C04B2235/9607C04B2235/9646C04B2235/9653C09K11/7774C09K11/7776C09K11/7792H01L33/502
Inventor 周有福凌军荣洪茂椿张云峰郭旺
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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