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Fluorescent ceramic applied to LED and preparation method of fluorescent ceramic

A fluorescent ceramic, blue light excitation technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of phosphor luminescent epoxy resin or silica gel aging, reduced device performance and service life, poor thermal conductivity, etc., to avoid environmental problems. Use of oxygen resin or silica gel, make up for light loss, good thermal conductivity

Inactive Publication Date: 2018-07-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, in the traditional packaging process, due to the poor thermal conductivity of the epoxy resin or silica gel used, the temperature of the LED chip during operation is as high as 150°C, which can easily lead to the thermal attenuation of the phosphor luminescence and the thermal degradation of the epoxy resin or silica gel. aging, yellowing
Especially in high-power LEDs, a lot of heat will be generated on the surface of the chip, which will seriously reduce the performance and service life of the device

Method used

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  • Fluorescent ceramic applied to LED and preparation method of fluorescent ceramic
  • Fluorescent ceramic applied to LED and preparation method of fluorescent ceramic
  • Fluorescent ceramic applied to LED and preparation method of fluorescent ceramic

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preparation example Construction

[0053] The invention also provides a method for preparing fluorescent ceramics applied to LEDs. The preparation method comprises the following steps:

[0054] S1, providing raw materials and performing ball milling, drying, and burning in sequence to obtain powder;

[0055] S2, performing grinding, molding, and cold isostatic pressing on the powder in sequence to obtain a prefabricated ceramic prefabricated ceramic;

[0056] S3, in an oxygen atmosphere, sintering the green body to obtain prefabricated ceramics;

[0057] S4, annealing the prefabricated ceramics in a reducing atmosphere to obtain prefabricated fluorescent ceramics.

[0058] In step S1, according to (A 1-x B x ) m-y C y (D 1-z E. z ) 8-m o 12 The stoichiometric ratio of the reaction raw materials was weighed. Commercially available micron or nanometer raw materials with a purity of more than 99% can be used without further processing of the raw materials, which can save costs and facilitate industriali...

Embodiment 1

[0073] The general chemical formula of this fluorescent ceramic is (Y 0.5 Gd 0.5 ) 2.9999 Ce 0.0001 (Ga 0.6 al 0.4 ) 5 o 12 , that is, x=0, y=0.0001, z=0.4, m=3, A is Y and Gd, C is Ce, D is Ga, and E is Al.

[0074] The preparation method of this fluorescent ceramic is as follows:

[0075] Commercially available high-purity Y 2 o 3 、Gd 2 o 3 、Ce 2 (CO 3 ) 3 , Ga 2 o 3 、Al 2 o 3 As the starting material, accurately weigh the quality of each oxide or carbonate according to the above formula. Use 5mm polytetrafluoroethylene balls as the grinding balls for the weighed reaction raw materials, and use absolute ethanol as the ball milling medium. The balls and the medium were put into a polytetrafluoroethylene ball mill jar, and ball milled in a planetary ball mill at a speed of 300 rad / min for 12 hours to obtain a slurry. After the slurry was dried at 70°C for 12h in a blast drying oven, it was fired at 600°C for 2h to obtain a powder.

[0076] The powder was g...

Embodiment 2

[0080] The general chemical formula of this fluorescent ceramic is (Y 0.5 Gd 0.5 ) 2.99 Ce 0.01 (Ga 0.6 sc 0.4 ) 5 o 12 , that is, x=0, y=0.01, z=0.4, m=3, A is Y and Gd, C is Ce, D is Ga, and E is Sc.

[0081] The preparation method of this fluorescent ceramic is as follows:

[0082] Commercially available high-purity Y 2 o 3 、Gd 2 o 3 、Ce 2 (CO 3 ) 3 , Ga 2 o 3 、Sc 2 o 3 As the starting material, accurately weigh the quality of each oxide or carbonate according to the above formula. Use 5mm polytetrafluoroethylene balls as the grinding balls for the weighed reaction raw materials, and use absolute ethanol as the ball milling medium. The balls and the medium were put into a polytetrafluoroethylene ball mill jar, and ball milled in a planetary ball mill at a speed of 300 rad / min for 12 hours to obtain a slurry. After the slurry was dried at 70°C for 12h in a blast drying oven, it was fired at 900°C for 2h to obtain a powder.

[0083] The powder was ground in...

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Abstract

The invention relates to fluorescent ceramic applied to an LED and a preparation method of the fluorescent ceramic. The general chemical formula of the fluorescent ceramic is (Al-xBx)m-yCy(D1-zEz)8-mO12, wherein A is at least one of Y, Gd, Tb and Lu; B is at least one of La and Yb; C is at least one of Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Ti, Cr and Mn; D is Ga; E is at least one of B, Al, In and Sc; x, y, z and m represent the mole fraction of the corresponding elements; 0< / =x< / =0.2, 0.0001< / =y< / =0.2, 0< / =z< / =0.8, and 2.5< / =m< / =3.5. The preparation method has the advantages that fluorescent powder is directly converted into a fluorescent block with fluorescent features, that is to say, the fluorescent powder is used as a remote fluorescent body in the form of fluorescent ceramic to be directly encapsulated at the top of the LED chip, the fluorescent material is separated from a heat source to reduce thermal light attenuation, the use of epoxy resin or silica gel is avoided, and the service life of an LED device is prolonged.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a fluorescent ceramic applied to LEDs and a preparation method thereof. Background technique [0002] With the advancement of light emitting diode (Light Emitting Diode, LED) technology, white light LED has gradually entered the field of general lighting from the application field of special light source. White LED is considered as the fourth-generation lighting source after incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps due to its high brightness, high color rendering index, energy saving, environmental protection, long life, small size, and high reliability. [0003] The price of high-performance white LED lamps is relatively high, which is mainly caused by two factors. On the one hand, existing white LED products mainly rely on direct current to drive, which means that additional electronic components are required. Through the current / voltag...

Claims

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Application Information

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IPC IPC(8): C09K11/80C04B35/01C04B35/622
CPCC04B35/01C04B35/622C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/658C09K11/7774C09K11/7787
Inventor 刘永福蒋俊江浩川乔建伟刘普
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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