CN104130779A - Yellow fluorescent powder used for white light LED and preparation method thereof - Google Patents
Yellow fluorescent powder used for white light LED and preparation method thereof Download PDFInfo
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- CN104130779A CN104130779A CN201410310688.3A CN201410310688A CN104130779A CN 104130779 A CN104130779 A CN 104130779A CN 201410310688 A CN201410310688 A CN 201410310688A CN 104130779 A CN104130779 A CN 104130779A
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- fluorescent powder
- yellow fluorescent
- white light
- light led
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- 239000000843 powder Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000498 ball milling Methods 0.000 claims abstract description 20
- 239000000376 reactant Substances 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 2
- 238000000227 grinding Methods 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
- 229910019990 cerium-doped yttrium aluminum garnet Inorganic materials 0.000 description 12
- 238000001228 spectrum Methods 0.000 description 10
- 229910052727 yttrium Inorganic materials 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000004570 mortar (masonry) Substances 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 239000004411 aluminium Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 241001025261 Neoraja caerulea Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000695 excitation spectrum Methods 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006862 quantum yield reaction Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 238000010671 solid-state reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Led Device Packages (AREA)
- Luminescent Compositions (AREA)
Abstract
The invention discloses a yellow fluorescent powder used for white light LED, a chemical formula is Y2.94-xCe0.06K3xAl5O12-1.5xF3x, wherein x is greater than 0 and less than or equal to 0.24. The invention also discloses a preparation method, which comprises the following steps: weighting raw materials according to stoichiometric ratio, fully mixing and then adding ethanol, performing ball milling to obtain a slurry; drying the slurry and pre-burning for 3-12 hours under 1200-1400 DEG C, naturally cooling to room temperature to obtain a pre-burning reactant; grinding the pre-burning reactant under reducing atmosphere and heating to 1500-1600 DEG C, insulating for 5-12 hours, naturally cooling to room temperature; and grinding to obtain the yellow fluorescent powder used for white light LED. The emmission spectrum center of the yellow fluorescent powder enables maximum bathochromic shift to 585nm from 540nm. The doped raw material KF has low cost, has flux effect for increasing emission intensity.
Description
Technical field
The present invention relates to material technology field, be specifically related to a kind of Yellow fluorescent powder used by white light LED and preparation method thereof.
Background technology
The nineties, Japan's day efficient blue-ray LED of sub-Developed, and form white light source with yellow fluorescent powder collocation.Its know-why is to utilize the blue light illumination yellow fluorescent powder that blue-light LED chip sends to make it send gold-tinted, and then the part blue light combination that gold-tinted and chip send obtains white light source.
Prior art has proved Y
3al
5o
12: Ce
3+(YAG:Ce) yellow fluorescent powder has up to more than 90% quantum yield, is a kind of yellow fluorescent powder efficient and with low cost, and it generally obtains by 1600 DEG C of above solid phase synthesis methods.But the emission wavelength center of traditional YAG:Ce yellow fluorescent powder under UV-light or blue-light excited condition is only 530nm left and right, lacks enough red wavelength parts, and it is combined and only can obtains cold white light with the blue light of blue-light LED chip.So need to make improvements in actual applications.Method is to adopt Gd or Lu the replacement of Y to be made to an emission wavelength red shift for YAG:Ce fluorescent material, and this method can be by the Gd that adulterates in reaction
2o
3or Lu
2o
3realize.For example CBG-4 type LED special phosphor, this fluorescent material is under blue-light excited condition, and emission wavelength reaches 550nm.Another kind method is to add small part red fluorescence powder in using yellow fluorescent powder, thereby can be combined and obtain warm white with blue light.
But traditional YAG:Ce yellow fluorescence powder, preparation method thereof synthesis temperature is high, and the rare earth element or the red light fluorescent powder price that regulate emission wavelength to use are high.
Summary of the invention
The object of the invention is to provide a kind of Yellow fluorescent powder used by white light LED, makes the red shift of YAG:Ce yellow fluorescent powder emission wavelength, is based on reducing the preparation cost that obtains LED warm white.The present invention also provides the preparation method of this Yellow fluorescent powder used by white light LED.
The present invention is by the following technical solutions:
A kind of Yellow fluorescent powder used by white light LED, described fluorescent material has following chemical formula: Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, in formula, 0 < x≤0.24.
The preparation method of above-mentioned Yellow fluorescent powder used by white light LED, comprises the steps:
Step 1, press chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3xstoichiometric ratio take Y
2o
3or Y (NO
3)
3, Al
2o
3or Al (NO
3)
3, CeO
2or Ce (NO
3)
4, KF, after fully mixing, add ethanol ball milling 12h～24h, obtain slurry;
Step 2, slurry dry 12h～24h at 80 DEG C～90 DEG C that step 1 is obtained; Pre-burning 3h～12h at 1200 DEG C～1400 DEG C, naturally cools to room temperature afterwards, obtains pre-burning reactant;
Step 3, the pre-burning reactant that step 2 is obtained grind 10min～30min, afterwards at 95%～90%N
2+ 5%～10%H
2reducing atmosphere under be heated to 1500 DEG C～1600 DEG C, insulation 5h～12h, naturally cool to room temperature, grind 30min～60min, obtain described Yellow fluorescent powder used by white light LED.
Al described in step 1
2o
3or Al (NO
3)
3take in stoichiometric ratio qualitatively excessive 10%～20%.
Beneficial effect of the present invention:
1, yellow fluorescent powder of the present invention is based on charge conservation criterion, method by the KF that adulterates in system is carried out modification to traditional YAG:Ce yellow fluorescent powder, regulates x can make it under UV-light or blue-light excited condition, send the emmission spectrum of varying strength and different launching centres.Emmission spectrum center can be from the maximum red shift of 540nm to 585nm.
2, the present invention adulterate use raw material KF cost compared with Gd
2o
3or Lu
2o
3far away be cheap, and the fusing assistant effect that KF plays in solid state reaction process can effectively promote the grain growing in reaction process, launches light intensity thereby increase.
Brief description of the drawings
Fig. 1 is the Yellow fluorescent powder used by white light LED X-ray diffraction spectrum of embodiment 1～3 preparation, and wherein ISCDcardNO.#23848 is pure yttrium aluminium garnet YAG: the standard x RD spectrogram of Ce yellow fluorescent powder.
Fig. 2 is the absorption spectrum of the Yellow fluorescent powder used by white light LED of embodiment 1～3 preparation.
Fig. 3 is the Yellow fluorescent powder used by white light LED of embodiment 1～3 preparation emmission spectrum under the blue-light excited condition of 460nm.
Fig. 4 is the Yellow fluorescent powder used by white light LED diffraction spectra of embodiment 4 and 5 preparations.
Fig. 5 is the Yellow fluorescent powder used by white light LED of the embodiment 4 and 5 preparation emmission spectrum under the blue-light excited condition of 460nm.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done further and explained.Following embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all among protection scope of the present invention.
A kind of Yellow fluorescent powder used by white light LED, described fluorescent material has following chemical formula: Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, in formula, 0 < x≤0.24.Criterion with charge balance replaces respectively Y and the O ion in traditional YAG:Ce fluorescent material with K and F ion.Regulate x, can make it under UV-light or blue-light excited condition, send the emmission spectrum of varying strength and different launching centres.
The preparation method of above-mentioned Yellow fluorescent powder used by white light LED, comprises the steps:
Step 1, press chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3xstoichiometric ratio take Y
2o
3or Y (NO
3)
3, Al
2o
3or Al (NO
3)
3, CeO
2or Ce (NO
3)
4, KF, after fully mixing, put into the agate jar ball milling 12h～24h that fills ethanol, obtain slurry;
Step 2, the slurry that step 1 is obtained are placed in the dry 12h～24h of loft drier of 80 DEG C～90 DEG C, obtain dry powder; Afterwards by dry powder in electric furnace with 1200 DEG C～1400 DEG C pre-burning 3h～12h, naturally cool to room temperature, obtain pre-burning reactant;
Step 3, pre-burning reactant agate mortar hand mill 10min～30min that step 2 is obtained, fully pulverize it, puts into afterwards and be connected with 95%～90%N
2+ 5%～10%H
2the electric furnace of reducing atmosphere in be heated to 1500 DEG C～1600 DEG C, insulation 5h～12h, naturally cools to room temperature, grinds 30～60min, obtains described Yellow fluorescent powder used by white light LED.
Above-mentioned preparation method is with chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3xstoichiometric ratio take each raw material, the crystalline structure of product is mainly Y
3al
5o
12yttrium aluminum garnet structure has been found a small amount of Y simultaneously
2al
4o
9yttrium aluminium monoclinic phase, a small amount of Y
2al
4o
9the existence of yttrium aluminium monoclinic phase to emission spectrum red shift play promoter action.By Al
2o
3or Al (NO
3)
3what take in stoichiometric ratio is excessive 10%～20% qualitatively, Y in product crystalline structure
2al
4o
9yttrium aluminium monoclinic phase can disappear, and shows pure Y
3al
5o
12yttrium aluminum garnet structure.
Embodiment 1
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.08 stoichiometric ratio, takes the Y of 32.29g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2with the KF of 1.39g, after fully mixing, put into the agate jar ball milling 12h that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1300 DEG C of pre-burning 6h, naturally cools to room temperature.By agate mortar hand mill 20min for the pre-burning reactant obtaining, it is fully pulverized, put into afterwards and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 6h, naturally cools to room temperature, grinds 45min, obtains Yellow fluorescent powder used by white light LED.
Embodiment 2
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.16 stoichiometric ratio, takes the Y of 31.39g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2with the KF of 2.79g, after fully mixing, put into the agate jar ball milling 12h that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1300 DEG C of pre-burning 6h, naturally cools to room temperature.By agate mortar hand mill 20min for the pre-burning reactant obtaining, it is fully pulverized, put into afterwards and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 6h, naturally cools to room temperature, grinds 45min, obtains Yellow fluorescent powder used by white light LED.
Embodiment 3
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.24 stoichiometric ratio, takes the Y of 30.48g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2with the KF of 4.18g, after fully mixing, put into the agate jar ball milling 12h that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1300 DEG C of pre-burning 6h, naturally cools to room temperature.By agate mortar hand mill 20min for the pre-burning reactant obtaining, it is fully pulverized, put into afterwards and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 6h, naturally cools to room temperature, grinds 45min, obtains Yellow fluorescent powder used by white light LED.
Embodiment 4
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.2 stoichiometric ratio, takes the Y of 30.93g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2with the KF of 3.49g, after fully mixing, put into the agate jar ball milling 12h that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1300 DEG C of pre-burning 6h, naturally cools to room temperature.By agate mortar hand mill 20min for the pre-burning reactant obtaining, it is fully pulverized, put into and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 6h, naturally cools to room temperature, grinds 45min, obtains Yellow fluorescent powder used by white light LED.
Embodiment 5
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.2 stoichiometric ratio, takes the Y of 30.93g
2o
3, 1.03g CeO
2with the KF of 3.49g, on the quality base calculating by stoichiometric ratio, excessive 15% takes Al
2o
329.33g, after fully mixing, puts into the agate jar ball milling 12h that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1300 DEG C of pre-burning 6h, naturally cools to room temperature.By agate mortar hand mill 20min for the pre-burning reactant obtaining, it is fully pulverized, put into and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 6h, naturally cools to room temperature, grinds 45min, obtains Yellow fluorescent powder used by white light LED.
Embodiment 6
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.16 stoichiometric ratio, takes the Y of 31.39g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2with the KF of 2.79g, after fully mixing, put into the agate jar ball milling 12hh that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 80 DEG C.The dry powder obtaining is put into electric furnace with 1200 DEG C of pre-burning 3h, naturally cools to room temperature.By agate mortar hand mill 10min for the pre-burning reactant obtaining, it is fully pulverized, put into and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 5h, naturally cools to room temperature, grinds 30min, obtains Yellow fluorescent powder used by white light LED.
Embodiment 7
According to chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, x=0.16 stoichiometric ratio, takes the Y of 31.39g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2with the KF of 2.79g, after fully mixing, put into the agate jar ball milling 24h that fills ethanol.Then the slurry after ball milling is placed in to the dry 24h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1400 DEG C of pre-burning 12h, naturally cools to room temperature.By agate mortar hand mill 30min for the pre-burning reactant obtaining, it is fully pulverized, put into and be connected with 90%N
2+ 10%H
2in the electric furnace of reducing atmosphere, be heated to 1600 DEG C, insulation 12h, naturally cools to room temperature, grinds 60min, obtains Yellow fluorescent powder used by white light LED.
The preparation method of traditional YAG:Ce yellow fluorescent powder (x=0) that below test is used is as follows:
According to chemical formula Y
2.94ce
0.06al
5o
12(YAG:Ce) stoichiometric ratio, takes the Y of 33.19g
2o
3, 25.50g Al
2o
3, 1.03g CeO
2, after fully mixing, put into the agate jar ball milling 12h that fills ethanol.Then the slurry after ball milling is placed in to the dry 12h of baking oven of 90 DEG C.The dry powder obtaining is put into electric furnace with 1300 DEG C of pre-burning 6h, naturally cools to room temperature.By agate mortar hand mill 20min for the pre-burning reactant obtaining, it is fully pulverized, put into afterwards and be connected with 95%N
2+ 5%H
2in the electric furnace of reducing atmosphere, be heated to 1500 DEG C, insulation 6h, naturally cools to room temperature, grinds 45min, obtains traditional YAG:Ce yellow fluorescent powder (x=0).
Use X-ray diffraction method to determine the Yellow fluorescent powder used by white light LED diffraction spectra of embodiment 1～3 preparation, as shown in Figure 1, synthetics principal phase is Y
3al
5o
12yttrium aluminum garnet structure, but the Y of small portion
2al
4o
9yttrium aluminium monoclinic phase diffraction peak is also found simultaneously.A small amount of Y
2al
4o
9the generation cause of yttrium aluminium monoclinic phase be K based on charge balance and F ionic replacement Y and O ion caused Y and O lattice point position atom number excessive.
As shown in Figure 2, excitation spectrum centre wavelength maintains 340nm and 460nm place for embodiment 1～3 Yellow fluorescent powder used by white light LED of preparation and the absorption spectrum of traditional YAG:Ce yellow fluorescent powder (x=0).The doping of KF is described, does not obviously change absorb light centre wavelength, illustrate that yellow fluorescent powder prepared by the present invention still can fully be excited by UV-light or blue light.
The Yellow fluorescent powder used by white light LED of embodiment 1～3 preparation and the emmission spectrum of traditional YAG:Ce yellow fluorescent powder (x=0) under the blue-light excited condition of 460nm are as shown in Figure 3, emitted luminescence intensity strengthens with the increase of KF doping, and obtains maximum luminescence center wavelength 585nm (orange-yellow) at x=0.16 place.
Use X-ray diffraction method to determine the Yellow fluorescent powder used by white light LED diffraction spectra of embodiment 4 and 5 preparations, as shown in Figure 4.In this figure due to Al atom supplement, Y in spectrogram
2al
4o
9yttrium aluminium monoclinic phase content significantly reduces.
As shown in Figure 5, the luminescence center wavelength ratio embodiment 5 of Yellow fluorescent powder used by white light LED prepared by embodiment 4 exceeds 20nm left and right to the emmission spectrum of the Yellow fluorescent powder used by white light LED of embodiment 4 and 5 preparations under the blue-light excited condition of 460nm.Y
2al
4o
9the existence of yttrium aluminium monoclinic phase to emission spectrum red shift play promoter action.
Claims (3)
1. a Yellow fluorescent powder used by white light LED, is characterized in that, described fluorescent material has following chemical formula: Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3x, in formula, 0 < x≤0.24.
2. the preparation method of Yellow fluorescent powder used by white light LED claimed in claim 1, is characterized in that, comprises the steps:
Step 1, press chemical formula Y
2.94-xce
0.06k
3xal
5o
12-1.5xf
3xstoichiometric ratio take Y
2o
3or Y (NO
3)
3, Al
2o
3or Al (NO
3)
3, CeO
2or Ce (NO
3)
4, KF, after fully mixing, add ethanol ball milling 12h～24h, obtain slurry;
Step 2, slurry dry 12h～24h at 80 DEG C～90 DEG C that step 1 is obtained; Pre-burning 3h～12h at 1200 DEG C～1400 DEG C, naturally cools to room temperature afterwards, obtains pre-burning reactant;
Step 3, the pre-burning reactant that step 2 is obtained grind 10min～30min, afterwards at 95%～90%N
2+ 5%～10%H
2reducing atmosphere under be heated to 1500 DEG C～1600 DEG C, insulation 5h～12h, naturally cool to room temperature, grind 30min～60min, obtain described Yellow fluorescent powder used by white light LED.
3. the preparation method of Yellow fluorescent powder used by white light LED according to claim 2, is characterized in that, Al described in step 1
2o
3or Al (NO
3)
3take in stoichiometric ratio qualitatively excessive 10%～20%.
Priority Applications (1)
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|---|---|---|---|
| CN201410310688.3A CN104130779A (en) | 2014-07-01 | 2014-07-01 | Yellow fluorescent powder used for white light LED and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310688.3A CN104130779A (en) | 2014-07-01 | 2014-07-01 | Yellow fluorescent powder used for white light LED and preparation method thereof |
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|---|---|
| CN104130779A true CN104130779A (en) | 2014-11-05 |
Family
ID=51803641
Family Applications (1)
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109486490A (en) * | 2018-11-29 | 2019-03-19 | 江苏博睿光电有限公司 | Garnet-based superfine fluorescent powder and preparation method thereof |
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-
2014
- 2014-07-01 CN CN201410310688.3A patent/CN104130779A/en active Pending
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| CN1880402A (en) * | 2005-06-17 | 2006-12-20 | 厦门通士达照明有限公司 | Method for preparing white light LED phosphor powder and flux therefor |
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| Title |
|---|
| 周瑞婷: "固相反应中不同助熔剂对YAG：Ce发光性能的影响", 《天津大学硕士学位论文》 * |
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| CN109486490A (en) * | 2018-11-29 | 2019-03-19 | 江苏博睿光电有限公司 | Garnet-based superfine fluorescent powder and preparation method thereof |
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