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Preparation method of complex-phase translucent fluorescent ceramics and LED module

A fluorescent ceramic, translucent technology, used in lighting and heating equipment, parts of lighting devices, light sources, etc., can solve the problem of poor consistency and batch stability, reduce the transparency and refractive index of the dispensing layer, and require strict preparation processes and other problems, to achieve the effect of raw material purity and low vacuum degree of sintering equipment, reducing thickness and phosphor concentration, and improving lighting efficiency

Active Publication Date: 2020-03-10
JIANGSU LUOHUA NEW MATERIAL
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the current COB packaging technology still uses phosphor dispensing packaging technology, which has exposed many problems in high-power devices: First, the continuous lighting of the chip is likely to cause device heating and temperature rise, resulting in color temperature changes, fluorescence Powder light decay and silica gel aging cannot accurately control the coating thickness and shape of the adhesive layer; second, the powder will produce scattering and absorption when light passes through, the uneven coating thickness and the morphology and particle size of the phosphor The packaging structure consistency and batch stability are poor; the third is that epoxy resin or silica gel has poor resistance to high temperature and ultraviolet radiation energy, which reduces the transparency and refractive index of the dispensing layer and affects the light efficiency and light intensity distribution of the device. , which greatly shortens the life of white LEDs
The above problems greatly limit the application of LEDs in high power (such as roads, car headlights, marine fisheries, stage lighting, etc.)
[0005] In order to overcome these problems, transparent fluorescent ceramics are proposed to be used instead of powder glue to obtain LED white light sources with better luminous performance. However, transparent ceramics have strict requirements on the purity of raw materials and preparation processes, and require high-vacuum sintering equipment or After hot isostatic pressing, the actual light conversion efficiency has not achieved excellent results

Method used

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  • Preparation method of complex-phase translucent fluorescent ceramics and LED module
  • Preparation method of complex-phase translucent fluorescent ceramics and LED module
  • Preparation method of complex-phase translucent fluorescent ceramics and LED module

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preparation example Construction

[0030] In an embodiment of the present invention, a method for preparing a complex-phase translucent fluorescent ceramic includes the following steps: providing raw materials, the raw materials include a first-phase phosphor powder and a second-phase ceramic raw material powder, and the first phase fluorescent powder The average grain size of powder grains (D 50 ) is 1 to 10 μm, and the average particle diameter (D 50 ) is 0.5-5 μm, the second-phase ceramic raw material powder and the first-phase phosphor are mixed according to the mass ratio of 0.1-5; Transparent fluorescent ceramic.

[0031] In this embodiment, the composition of the first phase phosphor is Re:YAG (yttrium aluminum garnet, Y 3 al 5 o 12 ), the Re is selected from one of cerium (Ce), lutetium (Lu), europium (Eu), neodymium (Nd), terbium (Tb), ytterbium (Yb) and praseodymium (Pr), and the phosphor The shape of the grains is nearly round. The second phase ceramic raw material powder is selected from alumi...

Embodiment 1

[0048] Weigh D separately 50 =10.5μm commercial YAG (yttrium aluminum garnet) phosphor 12g, D 50 = 1 μm commercial alumina powder 18g, add 0.4wt% tetraethyl orthosilicate (TEOS) and put it into a corundum ball mill jar, use absolute ethanol as a medium on a planetary ball mill, and obtain a mixed suspension after 400r / min ball milling for 10 hours, put Dry in an oven at 80°C for 10 hours to obtain a mixed powder, then pre-press the mixed powder at 10 MPa for 2 minutes, and then cold isostatically press at 200 MPa for 10 minutes to obtain a ceramic green body, and then place the green body in a vacuum sintering furnace for 10 ℃ / min to 1200 ℃, 5 ℃ / min to 1700 ℃, keep warm for 10 hours, cool to room temperature with the furnace, place in a muffle furnace at 5 ℃ / min to 1450 ℃ for annealing treatment for 10 hours, and finally put The ceramic block was cut, ground and polished to obtain a composite translucent ceramic sample 1 with a thickness of 0.4 mm.

Embodiment 2

[0050] Weigh D separately 50 = 5 μm of yttrium oxide (Y 2 o 3 ) powder 4.56g, D 50 = 5μm of cerium oxide (Ce 2 o 3 ) powder 0.04g, D 50 =0.5 μm commercial aluminum oxide powder 25.4g, submicron magnesia (MgO) powder 0.03g are put into the agate ball mill jar, on the planetary ball mill, with dehydrated alcohol as medium, 300r / min ball mill obtains mixed suspension in 8 hours, Dry in an oven at 80°C for 10 hours to obtain a mixed powder, then pre-press the mixed powder at 15 MPa for 1 min, and then press cold isostatically at 250 MPa for 5 min to obtain a ceramic green body, and then place the green body in a vacuum sintering furnace to 10°C / min to 1200°C, 5°C / min to 1650°C, heat preservation for 15 hours, cooling to room temperature with the furnace, annealing in a muffle furnace at 5°C / min to 1450°C for 5 hours, and finally The ceramic block was cut, ground and polished to obtain a composite translucent ceramic sample 2 with a thickness of 0.4 mm.

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Abstract

The invention provides a method for preparing multiphase translucent fluorescent ceramic. The method comprises providing raw materials comprising first phase phosphor and second phase ceramic raw material powder, wherein the first phase phosphor has the average crystal diameter (D50) of 1-10 micrometers and the second phase ceramic raw material powder has the average particle diameter (D50) of 0.5-5 micrometers, blending the second phase ceramic raw material powder and the first phase phosphor according to a mass ratio of 0.1-5, carrying out sintering pretreatment on the raw materials and carrying out sintering to obtain the multiphase translucent fluorescent ceramic. The method optimizes an excited blue light propagation route, improves the illumination efficiency, further reduces the usethickness of the fluorescent ceramic material and the phosphor concentration, acquires high-quality uniform white lights and has lower requirements on the light transmittance of the ceramic sheet, raw material purity and a sintering device vacuum degree. The invention also provides an LED module using the multiphase translucent fluorescent ceramic.

Description

technical field [0001] The invention relates to the field of solid-state lighting materials, in particular to a preparation method of complex-phase translucent fluorescent ceramics and an LED module using complex-phase translucent fluorescent ceramics. Background technique [0002] Light-emitting diode (1ight~emitting diode, LED) is known as a new generation of lighting source because of its long service life, high efficiency, energy saving, green environmental protection and other advantages, and has broad application prospects in the field of lighting and backlight display. [0003] The traditional white LED packaging method is to use one or several different types of phosphors to mix with transparent silica gel materials in a certain proportion and coat them on the blue chip, so as to realize the up-conversion of blue light wavelengths to obtain white LEDs. However, the photoelectric conversion efficiency of LEDs in the current technology is lower than 30%, and the remain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/50C04B35/10C04B35/443F21K9/64F21V19/00F21Y115/10
Inventor 罗雪方顾强罗子杰张亮
Owner JIANGSU LUOHUA NEW MATERIAL
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