A kind of luminous ceramic material and its preparation method and application
A technology of luminescent ceramics and ceramics, applied in the direction of luminescent materials, chemical instruments and methods, etc., to achieve the effects of simple process, excellent thermal stability, and low sintering temperature
Active Publication Date: 2019-02-26
XIAMEN UNIV
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Problems solved by technology
[0005] CaAlSiN 3 :Eu 2+ Red phosphor has become an important member of commercial red powder due to its high quantum efficiency and good thermal stability, but except for I.Pricha (I.Pricha, et al. "J.Ceram.Sci.Tech." 2015; 06 (01):63-68) CaAlSiN with the highest density of only 80% was prepared by pressureless sintering at ≥1700℃ 3 :Eu 2+ Except for red fluorescent ceramics, there are few reports on the ceramic preparation of the phosphor powder. Therefore, dense CaAlSiN 3 :Eu 2+ The preparation and performance characterization of red fluorescent ceramics are still problems to be solved
Method used
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Embodiment 1～7
[0061] Formulation Design: Choose Si 3 N 4 and SiO 2 Acts as a flux, immobilizing Ca 0.99 Eu 0.01 AlSiN 3 The mass fraction of the constant, according to (Ca 0.99 Eu 0.01 AlSiN 3 ) 0.8 -(Si 3 N 4 ) y -(SiO 2 ) z The original composition of (y+z=0.2), design 7 prescriptions, are respectively y=0, z=0; y=0.2, z=0; y=0.14, z=0.06; y=0.12, z=0.08; y=0.1, z=0.1; y=0.08, z=0.12; y=0.06, z=0.14.
[0062] Any of the above formulas are processed as follows:
[0063] Weighing: with the prepared Ca 0.99 Eu 0.01 AlSiN 3 Red phosphor, Si 3 N 4 Powder, SiO 2 Powder is the starting material, and various powder materials are weighed in strict accordance with the above-mentioned mass ratio;
[0064] Mixing: Manual mixing in a high-purity silicon nitride mortar;
[0065] Filling: Put the uniformly mixed powder into a graphite mold with an inner diameter of 15mm. The graphite mold and the upper and lower pressure heads are separated from the raw materials by graphite paper; ...
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Abstract
The invention relates to a luminous ceramic material as well as a preparation method and application thereof, and relates to luminous ceramic materials. Red fluorescent ceramic is formed by solid solution of an activating agent Eu in a crystal structure with the same crystal phase as CaAlSiN3, fluorescent powder with the chemical formula being Ca[1-x-y-z]M[y]Eu[x]Al[1-z]Si[1+z]N[3-z]O[z] is used as raw materials, and compact luminous ceramic is prepared through pressing sintering or normal pressure sintering; or the red fluorescent ceramic is formed in a way that red fluorescent powder with the same crystal structure as the CaAlSiN3 crystal phase is used as raw materials, at least one of oxides, fluorides or chloride fluxing agents of Si3N4, SiO2, Al2O3, MgO, Y2O3, Li2CO3, LiSi2N3, CaF2, SrF2, MgF2, AlF3 and LiF is added, and the compact luminous ceramic is prepared through pressing sintering or normal pressure sintering. The luminous ceramic material can be applied to the preparation of illumination or display devices.
Description
technical field [0001] The present invention relates to luminescent ceramic materials, in particular to materials with CaAlSiN 3 A transparent and (or) translucent luminous ceramic material with the same crystal structure in the crystal phase and its preparation method and application. Background technique [0002] Compared with traditional light sources, LED (Light Emitting Diode, the abbreviation of Light Emitting Diode) has the advantages of high luminous efficiency, energy saving, environmental protection, long life, small size, fast response, high reliability, and no radiation, and has been widely valued. Although LED technology is constantly improving, the problem of heat dissipation is still a severe test for high-power white LEDs. In addition, although the LED can provide a large luminous flux, it is limited by a large etendue, and its brightness cannot meet the requirements of high-brightness display. In contrast, the laser has good directionality, and the laser s...
Claims
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IPC IPC(8): C04B35/58C09K11/64
CPCC04B35/58C04B2235/3208C04B2235/3217C04B2235/3224C04B2235/3418C04B2235/3873C09K11/7734
Inventor 解荣军
Owner XIAMEN UNIV