Fluorescent ceramic with high color rendering index and high thermal stability for white light illumination and preparation method of fluorescent ceramic

A high thermal stability, fluorescent ceramic technology, applied in the field of fluorescent ceramic materials, can solve the problems of decreased thermal stability, decreased thermal stability of fluorescent ceramics, and high manufacturing costs, and achieves enhanced absorption strength, high thermal stability, and high emission intensity. Effect

Active Publication Date: 2021-11-02
XUZHOU NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

Although there have been reports on cerium ion-doped yttrium aluminum garnet, lutetium aluminum garnet, and gadolinium aluminum garnet, the thermal stability of fluorescent ceramics also decreases while the spectrum is adjusted (X. Liu, H. Zhou,Z.Hu,X.Chen,Y.Shi,J.Zou,J.Li,Transparent Ce:GdYAG ceramic colorconverters for high-brightness white LEDs andLDs,Optical Materials,88(2019)97-102.)
Using Gd3+ to replace Y3+ in YAG, through Mg2+-Si4+ ion pair Replacing the Al3+-Al3+ ion pair in Ce:YAG can enhance red light emission and improve the color rendering index of LED / LD light source, but it is thermally stable Sex decline is also obvious (Q.Du, S.Feng, H.Qin, H.Hua, H.Ding, L.Jia, Z.Zhang, J.Jiang, H.Jiang, Massive red-shifting of Ce 3+emission by Mg2+and Si4+doping of YAG: Ce transparent ceramic phosphors, Journal of Materials Chemistry C, 6(2018) 12200-12205 .) ; the patent for invention with the publication number CN110218085A realizes red, green and yellow three-color coupling luminescence by designing composite structure fluorescent ceramics, and obtains warm white light, but the manufacturing cost of this method is higher, and the thermal stability of the prepared fluorescent ceramics is also low. decreasing gradually
In summary, although the above scheme can improve the index of single colorimetry, the thermal stability decreases

Method used

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  • Fluorescent ceramic with high color rendering index and high thermal stability for white light illumination and preparation method of fluorescent ceramic
  • Fluorescent ceramic with high color rendering index and high thermal stability for white light illumination and preparation method of fluorescent ceramic
  • Fluorescent ceramic with high color rendering index and high thermal stability for white light illumination and preparation method of fluorescent ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation chemical formula is (Lu 0.988 Ce 0.002 Bi 0.01 ) 3 (Al 0.998 mn 0.002 ) 5 o 12 fluorescent ceramics.

[0032] (1) Set the target product quality as 60.029g, according to the chemical formula (Lu 0.988 Ce 0.002 Bi 0.01 ) 3 (Al 0.998 mn 0.002 ) 5 o 12 The stoichiometric ratio of each element in α-lutetium oxide (41.487g), aluminum oxide (17.896g), bismuth oxide (0.492g), manganese carbonate (0.081g) and cerium oxide (0.073g) were weighed as raw material powder ;

[0033] (2) Mix the above-mentioned various raw material powders with 200mL of absolute ethanol, and additionally add a charge compensator (0.003g). The charge compensator is nano-spherical silica with an average particle size of 1nm, which is obtained by ball milling in a ball mill tank For the mixed slurry, the ball milling speed is 190r / min, and the ball milling time is 16h; the molar ratio between nano-spherical silica and manganese carbonate is 0.07:1; the mixed slurry is drie...

Embodiment 2

[0040] The preparation chemical formula is (Lu 0.981 Ce 0.004 Bi 0.015 ) 3 (Al 0.99 mn 0.01 ) 5 o 12 fluorescent ceramics.

[0041] (1) Set the target product quality as 60.133g, according to the chemical formula (Lu 0.981 Ce 0.004 Bi 0.015 ) 3 (Al 0.99 mn 0.01 ) 5 o 12 The stoichiometric ratio of each element in α-lutetium oxide (41.125g), aluminum oxide (17.723g), bismuth oxide (0.736g), manganese carbonate (0.404g) and cerium oxide (0.145g) were weighed as raw material powder ;

[0042] (2) Mix the above-mentioned various raw material powders with 200mL of absolute ethanol, and additionally add a charge compensator (0.852g). The charge compensator is nano-spherical silica with an average particle size of 3nm, which is obtained by ball milling in a ball mill tank For the mixed slurry, the ball milling speed is 190r / min, and the ball milling time is 16h; the molar ratio between nano-spherical silica and manganese carbonate is 4:1; the mixed slurry is dried in ...

Embodiment 3

[0049] The preparation chemical formula is (Lu 0.964 Ce 0.006 Bi 0.03 ) 3 (Al 0.98 mn 0.02 ) 5 o 12 fluorescent ceramics.

[0050] (1) Set the target product quality as 60.261g, according to the chemical formula (Lu 0.964 Ce 0.006 Bi 0.03 ) 3 (Al 0.98 mn 0.02 ) 5 o 12 The stoichiometric ratio of each element in α-lutetium oxide (40.283g), aluminum oxide (17.489g), bismuth oxide (1.468g), manganese carbonate (0.805g) and cerium oxide (0.216g) were weighed as raw material powder ;

[0051] (2) Mix the above-mentioned various raw material powders with 200mL of absolute ethanol, and additionally add a charge compensator (2.063g). The charge compensator is nano-spherical silica with an average particle size of 5nm, which is obtained by ball milling in a ball mill tank For the mixed slurry, the ball milling speed is 200r / min, and the ball milling time is 20h; the molar ratio between nano-spherical silica and manganese carbonate is 5:1; the mixed slurry is dried in a ...

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Abstract

The invention discloses fluorescent ceramic with a high color rendering index and high thermal stability for white light illumination and a preparation method of the fluorescent ceramic. The chemical formula of the fluorescent ceramic is (Lu<1-x-y>CexBiy)3(Al<1-z>Mnz)5O12, wherein x and y are respectively molar percentages of Ce < 3 + > and Bi < 3 + > doped Lu < 3 + > sites, z is the molar percentage of Al < 3 + > sites in a Mn < 2 + > doped octahedron, x is greater than or equal to 0.002 and less than or equal to 0.006, y is greater than or equal to 0.01 and less than or equal to 0.03, and z is greater than or equal to 0.002 and less than or equal to 0.02. The preparation method comprises the steps of weighing raw materials of alpha-lutetium oxide, aluminum oxide, bismuth oxide, manganese carbonate and cerium oxide, mixing and ball-milling various raw material powders, a charge compensation agent and a ball-milling medium to obtain mixed slurry, drying and sieving to obtain mixed powder, putting the mixed powder into a mold, and carrying out dry pressing molding and cold isostatic pressing molding to obtain a biscuit; and sintering the biscuit in a vacuum furnace, and annealing in air to obtain the fluorescent ceramic. The prepared ceramic is high in color rendering index and high in thermal stability.

Description

technical field [0001] The invention relates to the technical field of fluorescent ceramic materials, in particular to a fluorescent ceramic with high color rendering index and high thermal stability for white light illumination and a preparation method thereof. Background technique [0002] With the increasingly serious energy crisis, the environmental protection and energy-saving industry has been widely valued at home and abroad. As a new generation of lighting source, the economical and energy-saving fluorescent conversion white light-emitting diode (LED / LD) has the advantages of high luminous efficiency, low energy consumption, environmental protection, and long service life. It has been widely used in various lighting fields. [0003] Traditional fluorescent powder and organic resin "SMD" package LED thermal conductivity is low (0.1-0.4Wm -1 K -1 ), it is difficult to withstand long-term strong thermal shock, which is easy to cause temperature quenching, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622
CPCC04B35/44C04B35/622C04B2235/3224C04B2235/3217C04B2235/3298C04B2235/442C04B2235/3229C04B2235/77C04B2235/9646C04B2235/6562C04B2235/6565Y02B20/00
Inventor 张乐杨聪聪张曦月黄国灿王忠英邵岑康健周春鸣李明周天元陈浩
Owner XUZHOU NORMAL UNIVERSITY
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