CN105176530A - High-brightness tungstate red fluorescent powder and preparation method thereof - Google Patents
High-brightness tungstate red fluorescent powder and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-brightness tungstate red fluorescent powder and a preparation method thereof. The chemical formula of the fluorescent powder is as follows: CaGd<2-x-y>YyEux(WO4)4, x=0.1, 0.2, 0.3, 0.4 and 0.5, and y=0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4 and 1.6. The preparation method comprises the following steps: respectively measuring CaCO3, Gd2O3, Y2O3, Eu2O3 and WO3 according to a stoichiometric ratio, mixing to obtain a mixture A, sequentially ball milling the mixture A to obtain a mixture B, drying the mixture B to obtain mixed powder C, facilitating the mixed powder C to pass through a 200-mesh to 300-mesh screen to obtain mixed powder D, calcining for 4 to 6 hours at the temperature of 900 to 1100 DEG C, and then cooling to the room temperature to obtain the product. The high-brightness tungstate red fluorescent powder has beneficial effects that the problems of the existing red fluorescent material for a white-light LED that the stability is poor, the color purity is poor and the luminescence efficiency is low can be solved; according to the preparation method, by adjusting the impurity doping amount and the process parameters of ions such as Y<3+> and Eu<3+>, the single-dispersion spherical powder with high purity, uniformity in doping and controllability in granularity can be prepared, so that the fluorescent powder is high in stability and high in color purity and can be effectively stimulated by near ultraviolet and blue light.
Description
Technical field
The present invention relates to a kind of fluorescent material and preparation method thereof, be specifically related to a kind of high brightness tungstate red fluorescent powder and preparation method thereof, belong to material chemistry technical field.
Background technology
1993, the appearance of launching the GaN photodiode (LED) of blue light was that lighting field brings a far reaching revolution, passed through to adopt GaN-LED chip and YAG:Ce subsequently in 1996
3+phosphor combination sends white light, develops the 1st white light LEDs solid light source.After this, white light LEDs is little with volume, thermal value is low, current consumption is little, the life-span is long, speed of response is fast, environmental protection, can the advantage such as planar package arouse great concern, be described as be by surmount incandescent light, luminescent lamp and HID (HighIntensityDischarge) lamp the 4th generation lighting source.
Realize white light LEDs and mainly contain two kinds of methods, namely use blue-light LED chip+yellow fluorescent powder or UV LED chip+three primary colours (red, green, blue) fluorescent material to combine to realize.When but blue-light LED chip and yellow fluorescent powder are combined to form white light at present, owing to lacking red color components, make its luminous efficiency lower, and under higher electric current, the enhancing of blue light strength than yellow light intensity strengthen fast, thus result in colour temperature change, reduce colour rendering index.The white light LEDs cost of UV LED chip+three primary colors fluorescent powder combination is low, controls easily, but with regard to its efficiency, because the luminous efficiency of red fluorescence powder is low, causes packaged white light LED color temperature higher.So the major technology bottleneck realizing white light LEDs is at present the red fluorescence powder lacking high purity, high brightness.Therefore exploitation can be had great importance by the red fluorescence powder that near ultraviolet and blue light effectively excite.
Tungstate is as an important component part of solid material, and the performance such as optics, electricity of its excellence makes it have very large application prospect in fields such as scintillation crystal, laser medium, LED fluorescent materials.Eu
3+ion-activated tungstate has good luminescent properties, pure color and stability, and tungstate ion has very strong absorption at blue light and ultraviolet band, and passes to the Eu be entrained in wherein
3+, make Eu
3+can UV-light and blue-light excited under, send very strong ruddiness.Therefore tungstate is a kind of very promising fluorescent material that can be applied in ultraviolet and blue-light LED chip.
Summary of the invention
The object of the present invention is to provide a kind of tungstate red fluorescent powder and preparation method of high brightness, to solve the problems such as existing white light LEDs red fluorescence material poor stability, purity of color difference and luminous efficiency are low.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
A kind of high brightness tungstate red fluorescent powder, it is characterized in that, chemical formula is: CaGd
2-x-yy
yeu
x(WO
4)
4, wherein, x=0.1,0.2,0.3,0.4,0.5, y=0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6.
Aforesaid high brightness tungstate red fluorescent powder, is characterized in that, chemical formula is: CaGd
2-x-yy
yeu
x(WO
4)
4, wherein, x=0.4, y=0.8.
Prepare a method for aforesaid high brightness tungstate red fluorescent powder, it is characterized in that, comprise the following steps:
Step1: take calcium carbonate CaCO respectively according to mol ratio
3, gadolinium sesquioxide Gd
2o
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then through being mixed with out mixture A;
Step2: mixture A is placed in ball mill with the speed ball milling 5 ~ 10h of 350 ~ 450rpm, obtains mixture B;
Step3: dried by mixture B, obtains mixed powder C;
Step4: mixed powder C is placed in mortar and fully grinds, and cross 200 ~ 300 mesh sieves to abolish aggregate, obtain mixed powder D;
Step5: mixed powder D is placed in crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, obtains high brightness red fluorescence powder CaGd
2-x-yy
yeu
x(WO
4)
4.
Aforesaid preparation method, is characterized in that, in Step2, the process of ball milling is:
The mixture A obtained by Step1 is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.0 ~ 1.5ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine and carry out ball milling, obtain mixture B.
Aforesaid preparation method, is characterized in that, in Step3, the condition of oven dry is: mixture B is positioned over 80 ~ 100 DEG C of oven dry 5 ~ 10h in loft drier, obtains mixture C.
Aforesaid preparation method, is characterized in that, in Step5, the process of calcining is:
First with ramp to 400 ~ 500 DEG C of 2 ~ 4 DEG C/min, insulation 1 ~ 3h;
Again with ramp to 900 ~ 1000 DEG C of 2 ~ 4 DEG C/min, insulation 4 ~ 6h;
Finally cool to room temperature with the furnace.
Usefulness of the present invention is:
(1) tungstate red fluorescent powder:
Tungstate red fluorescent powder CaGd of the present invention
2-x-yy
yeu
x(WO
4)
4be mixed with europium element, this fluorescent material has scheelite-type structure, in such an embodiment Eu
3+case shared by ion does not have inversion symmetry, according to transition speed, makes Eu
3+ion is under near ultraviolet (393nm) and blue light (466nm) excite, and luminescent spectrum is based on the electric dipole transition at 616nm place;
(1) problem of existing white light LEDs red fluorescence material poor stability is solved
Because CaGd
2-x-yy
yeu
x(WO
4)
4red fluorescence powder synthesizes at a higher temperature, and it has good chemical stability and thermostability, so solve the problem of existing white light LEDs red fluorescence material poor stability.
(2) problem of existing white light LEDs red fluorescence material purity of color difference is solved
Because at CaGd
2-x-yy
yeu
x(WO
4)
4in fluorescent material, Eu
3+case shared by ion has non-central inversion symmetry, according to transition speed, makes Eu
3+ion near ultraviolet and blue-light excited under, its luminescent spectrum based on the red emission at 616nm place, so solve the problem of existing white light LEDs red fluorescence material purity of color difference.
(3) the low problem of existing white light LEDs red fluorescence material luminous efficiency is solved
Because at CaGd
2-x-yy
yeu
x(WO
4)
4in fluorescent material, by optimizing Eu
3+, Y
3+doping content and the energy delivery mechanism in research matrix structure of ion, can effectively improve light-emitting phosphor intensity, and greatly can improve the luminous efficiency of applied LED, so solve the low problem of existing white light LEDs red fluorescence material luminous efficiency.
(2) preparation method of fluorescent material:
(1) preparation technology is simple, is easy to manipulation, not only safe but also rapid;
(2) by adjustment Y
3+, Eu
3+the doping of ion and processing parameter, can prepare high-purity, that Uniform Doped, granularity are controlled monodisperse spherical powder, make fluorescent material have high stability and high color purity, and effectively can be excited by near ultraviolet and blue light.
Accompanying drawing explanation
Fig. 1 is the XRD figure spectrum of the tungstate red fluorescent powder utilizing method of the present invention to prepare;
Fig. 2 is the SEM collection of illustrative plates of the tungstate red fluorescent powder utilizing method of the present invention to prepare;
Fig. 3 is the exciting light spectrogram of the tungstate red fluorescent powder utilizing method of the present invention to prepare;
Fig. 4 is the utilizing emitted light spectrogram of the tungstate red fluorescent powder utilizing method of the present invention to prepare;
Fig. 5 is luminous intensity and the Eu of the tungstate red fluorescent powder utilizing method of the present invention to prepare
3+ionic concn graph of a relation;
Fig. 6 is luminous intensity and the Y of the tungstate red fluorescent powder utilizing method of the present invention to prepare
3+ionic concn graph of a relation.
Embodiment
The present invention is by adjustment Y
3+, Eu
3+the doping of ion and processing parameter, can prepare high-purity, that Uniform Doped, granularity are controlled monodisperse spherical powder, make fluorescent material have high stability and high color purity, and effectively can be excited by near ultraviolet and blue light.
Below in conjunction with the drawings and specific embodiments, concrete introduction is done to the present invention.
Embodiment 1
Preparation CaGd
1.1y
0.8eu
0.1(WO
4)
4(x=0.1, y=0.8)
Step1: according to mol ratio
take calcium carbonate CaCO respectively
3, gadolinium sesquioxide Gd
2o
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then mix five, form mixture A.
Step2: mixture A is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.0ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine, carry out ball milling with the speed of 450rpm, ball milling 5h, obtain mixture B.
Step3: be positioned over by mixture B in 80 DEG C of loft drier and dry 10h, obtains mixed powder C.
Step4: mixed powder C is placed in agate mortar and fully grinds, and cross 200 mesh sieves, to abolish aggregate, obtain mixed powder D.
Step5: mixed powder D is placed in corundum crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, first with the ramp to 500 DEG C of 2 DEG C/min, and insulation 2h; Again with the ramp to 1000 DEG C of 2 DEG C/min, insulation 4h; Finally cool to room temperature with the furnace, namely prepare CaGd
1.1y
0.8eu
0.1(WO
4)
4high brightness red fluorescence powder.
Fig. 1 is the XRD figure spectrum of the tungstate red fluorescent powder that the present embodiment prepares.
As can be seen from Figure 1: CaGd
1.1y
0.8eu
0.1(WO
4)
4x-ray diffraction peak and the international standard diffraction card JCPDS36-0192 of red fluorescence powder are completely the same, do not have the diffraction peak of other any impurity phase.
This illustrates: utilize the CaGd prepared by method of the present invention
1.1y
0.8eu
0.1(WO
4)
4red fluorescence powder is single-phase scheelite-type structure, i.e. Eu
3+and Y
3+replace Gd
3+do not change crystalline structure, but define complete solid solution.
Fig. 2 is the SEM collection of illustrative plates of the tungstate red fluorescent powder that the present embodiment prepares.
As can be seen from Figure 2: the CaGd prepared by 1000 DEG C of high-temperature calcination 4h
1.1y
0.8eu
0.1(WO
4)
4the particle diameter of fluorescent material is less, good dispersity, median size about 1 μm.
Fig. 3 and Fig. 4 is respectively the CaGd measured by spectrophotofluorometer F-7100
1.1y
0.8eu
0.1(WO
4)
4the exciting light spectrogram of red fluorescence powder and utilizing emitted light spectrogram.
As can be seen from Figure 3: CaGd under 616nm detects
1.1y
0.8eu
0.1(WO
4)
4the excitation spectrum of fluorescent material is made up of two portions, and a part is the Broad excitation band being positioned at 200nm ~ 350nm, and it is mainly because Sauerstoffatom is to Eu
3+cause with W atomic charge transition; Another part is made up of a series of razor-edges between 350 ~ 550nm, and it belongs to Eu
3+4f-4f transition, main peak lay respectively at 393nm (
7f
0→
5l
6) and 466nm (
7f
0→
5d
2), the emmission spectrum of this and the current near ultraviolet LED chip that generally uses and blue-light LED chip coincide, and thus can be used as the red fluorescence powder of near ultraviolet and blue-light excited three primary colors fluorescent powder composing type white light LEDs.
As can be seen from Figure 4: CaGd
1.1y
0.8eu
0.1(WO
4)
4the emmission spectrum main peak of red fluorescence powder under 393nm excites is positioned at 616nm, belongs to Eu
3+'s
5d
0→
7f
2electric dipole transition.
Embodiment 2
Preparation CaGd
0.8y
0.8eu
0.4(WO
4)
4(x=0.4, y=0.8)
Step1: according to mol ratio
take calcium carbonate CaCO respectively
3, gadolinium sesquioxide Gd
2o
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then mix five, form mixture A.
Step2: mixture A is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.5ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine, carry out ball milling with the speed of 400rpm, ball milling 7h, obtain mixture B.
Step3: be positioned over by mixture B in 90 DEG C of loft drier and dry 7h, obtains mixed powder C.
Step4: mixed powder C is placed in agate mortar and fully grinds, and cross 300 mesh sieves, to abolish aggregate, obtain mixed powder D.
Step5: mixed powder D is placed in corundum crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, first with the ramp to 450 DEG C of 3 DEG C/min, and insulation 2h; Again with the ramp to 1000 DEG C of 3 DEG C/min, insulation 4h; Finally cool to room temperature with the furnace, namely prepare CaGd
0.8y
0.8eu
0.4(WO
4)
4high brightness red fluorescence powder.
Embodiment 3
Preparation CaGd
0.7y
0.8eu
0.5(WO
4)
4(x=0.5, y=0.8)
Step1: according to mol ratio
take calcium carbonate CaCO respectively
3, gadolinium sesquioxide Gd
2o
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then mix five, form mixture A.
Step2: mixture A is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.5ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine, carry out ball milling with the speed of 350rpm, ball milling 10h, obtain mixture B.
Step3: be positioned over by mixture B in 100 DEG C of loft drier and dry 5h, obtains mixed powder C.
Step4: mixed powder C is placed in agate mortar and fully grinds, and cross 200 mesh sieves, to abolish aggregate, obtain mixed powder D.
Step5: mixed powder D is placed in corundum crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, first with the ramp to 400 DEG C of 4 DEG C/min, and insulation 3h; Again with the ramp to 1000 DEG C of 4 DEG C/min, insulation 4h; Finally cool to room temperature with the furnace, namely prepare CaGd
0.7y
0.8eu
0.5(WO
4)
4high brightness red fluorescence powder.
In addition, we have adjusted Gd
2o
3and Eu
2o
3ratio, and adopt step similarly to Example 2 and close processing parameter, successfully prepared following product:
CaGd
1.1Y
0.8Eu
0.1(WO
4)
4；
CaGd
1.0Y
0.8Eu
0.2(WO
4)
4；
CaGd
0.9Y
0.8Eu
0.3(WO
4)
4；
And CaGd
0.7y
0.8eu
0.5(WO
4)
4.
We are respectively to the CaGd obtained after 1000 DEG C of sintering 4h
1.1y
0.8eu
0.1(WO
4)
4, CaGd
1.0y
0.8eu
0.2(WO
4)
4, CaGd
0.9y
0.8eu
0.3(WO
4)
4, CaGd
0.8y
0.8eu
0.4(WO
4)
4and CaGd
0.7y
0.8eu
0.5(WO
4)
4carry out XRD analysis, confirm that each product is target product.
Different Eu
3+the fluorescent material of doping, their intensity of emission spectra is along with Eu
3+doping content change and change, as shown in Figure 5, as can be seen from Figure 5, different Eu
3+the utilizing emitted light spectrogram of the sample of doping content is similar, and under near-ultraviolet light 393nm excites, emission peak main peak is all positioned at 616nm, belongs to
5d
0→
7f
2electric dipole transition, but the emissive porwer of fluorescent material is along with Eu
3+the change of doping and changing, Eu
3+optimum doping concentration be x=0.4.
Embodiment 4
Preparation CaGd
1.4y
0.2eu
0.4(WO
4)
4(x=0.4, y=0.2)
Step1: according to mol ratio
take calcium carbonate CaCO respectively
3, gadolinium sesquioxide Gd
2o
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then mix five, form mixture A.
Step2: mixture A is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.2ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine, carry out ball milling with the speed of 400rpm, ball milling 5h, obtain mixture B.
Step3: be positioned over by mixture B in 80 DEG C of loft drier and dry 10h, obtains mixed powder C.
Step4: mixed powder C is placed in agate mortar and fully grinds, and cross 200 mesh sieves, to abolish aggregate, obtain mixed powder D.
Step5: mixed powder D is placed in corundum crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, first with the ramp to 400 DEG C of 4 DEG C/min, and insulation 3h; Again with the ramp to 900 DEG C of 4 DEG C/min, insulation 6h; Finally cool to room temperature with the furnace, namely prepare CaGd
1.4y
0.2eu
0.4(WO
4)
4high brightness red fluorescence powder.
Embodiment 5
Preparation CaY
1.6eu
0.4(WO
4)
4(x=0.4, y=1.6)
Step1: according to mol ratio
take calcium carbonate CaCO respectively
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then mix five, form mixture A.
Step2: mixture A is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.0ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine, carry out ball milling with the speed of 350rpm, ball milling 10h, obtain mixture B.
Step3: be positioned over by mixture B in 100 DEG C of loft drier and dry 5h, obtains mixed powder C.
Step4: mixed powder C is placed in agate mortar and fully grinds, and cross 300 mesh sieves, to abolish aggregate, obtain mixed powder D.
Step5: mixed powder D is placed in corundum crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, first with the ramp to 500 DEG C of 4 DEG C/min, and insulation 1h; Again with the ramp to 900 DEG C of 4 DEG C/min, insulation 6h; Finally cool to room temperature with the furnace, namely prepare CaY
1.6eu
0.4(WO
4)
4high brightness red fluorescence powder.
In addition, we have adjusted Y
2o
3ratio, and adopt step similarly to Example 2 and close processing parameter, successfully prepared CaGd
1.6-yy
yeu
0.4(WO
4)
4series phosphor powder, wherein, y=0.2,0.4,0.6,1.0,1.2,1.4,1.6.
We are respectively to the CaGd obtained after 1000 DEG C of sintering 4h
1.4y
0.2eu
0.4(WO
4)
4, CaGd
1.2y
0.4eu
0.4(WO
4)
4, CaGd
1.0y
0.6eu
0.4(WO
4)
4, CaGd
0.8y
0.8eu
0.4(WO
4)
4, CaGd
0.6y
1.0eu
0.4(WO
4)
4, CaGd
0.4y
1.2eu
0.4(WO
4)
4, CaGd
0.2y
1.4eu
0.4(WO
4)
4and CaY
1.6eu
0.4(WO
4)
4carry out XRD analysis, confirm that each product is target product.
Different Y
3+the fluorescent material of doping, their intensity of emission spectra is along with Y
3+doping content change and change, as shown in Figure 6, as can be seen from Figure 6, different Y
3+the utilizing emitted light spectrogram of the sample of doping content is similar, and under near-ultraviolet light 393nm excites, emission peak main peak is all positioned at 616nm, belongs to
5d
0→
7f
2electric dipole transition, but the emissive porwer of fluorescent material is along with Y
3+the change of doping and changing, Y
3+optimum doping concentration be y=0.8.
As can be seen here, the present invention is by adjusting doping and the processing parameter of rare-earth europium ion, high-purity, that Uniform Doped, granularity are controlled monodisperse spherical powder can be prepared, thus make fluorescent material have high stability and high color purity, and effectively can be excited by near ultraviolet and blue light.
It should be noted that, above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (6)
1. a high brightness tungstate red fluorescent powder, is characterized in that, chemical formula is: CaGd
2-x-yy
yeu
x(WO
4)
4, wherein, x=0.1,0.2,0.3,0.4,0.5, y=0.2,0.4,0.6,0.8,1.0,1.2,1.4,1.6.
2. high brightness tungstate red fluorescent powder according to claim 1, is characterized in that, chemical formula is: CaGd
2-x-yy
yeu
x(WO
4)
4, wherein, x=0.4, y=0.8.
3. the method for the high brightness tungstate red fluorescent powder of preparation described in claim 1 or 2, is characterized in that, comprise the following steps:
Step1: take calcium carbonate CaCO respectively according to mol ratio
3, gadolinium sesquioxide Gd
2o
3, yttrium oxide Y
2o
3, europium sesquioxide Eu
2o
3and Tungsten oxide 99.999 WO
3, then through being mixed with out mixture A;
Step2: mixture A is placed in ball mill with the speed ball milling 5 ~ 10h of 350 ~ 450rpm, obtains mixture B;
Step3: dried by mixture B, obtains mixed powder C;
Step4: mixed powder C is placed in mortar and fully grinds, and cross 200 ~ 300 mesh sieves to abolish aggregate, obtain mixed powder D;
Step5: mixed powder D is placed in crucible, and crucible is put into retort furnace, starts to calcine in air atmosphere, obtains high brightness red fluorescence powder CaGd
2-x-yy
yeu
x(WO
4)
4.
4. preparation method according to claim 3, is characterized in that, in Step2, the process of ball milling is:
The mixture A obtained by Step1 is placed in planet ball grinding machine, dehydrated alcohol is measured according to the material total mass of ball milling, every 1g ball milling material measures 1.0 ~ 1.5ml dehydrated alcohol, the dehydrated alcohol measured is added in planet ball grinding machine as medium, open planet ball grinding machine and carry out ball milling, obtain mixture B.
5. preparation method according to claim 3, is characterized in that, in Step3, the condition of oven dry is: mixture B is positioned over 80 ~ 100 DEG C of oven dry 5 ~ 10h in loft drier, obtains mixture C.
6. preparation method according to claim 3, is characterized in that, in Step5, the process of calcining is:
First with ramp to 400 ~ 500 DEG C of 2 ~ 4 DEG C/min, insulation 1 ~ 3h;
Again with ramp to 900 ~ 1000 DEG C of 2 ~ 4 DEG C/min, insulation 4 ~ 6h;
Finally cool to room temperature with the furnace.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815312A (en) * | 2017-10-27 | 2018-03-20 | 江苏师范大学 | A kind of adjustable Tungstate fluorescent powder of glow color and preparation method thereof |
| CN108193274A (en) * | 2017-11-29 | 2018-06-22 | 宁波大学 | A kind of double tungstates scintillation crystal and preparation method thereof |
| CN113388398A (en) * | 2021-06-11 | 2021-09-14 | 厦门理工学院 | Eu (Eu)3+Rare earth yttrium-based tungstate doped fluorescent powder and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107815312A (en) * | 2017-10-27 | 2018-03-20 | 江苏师范大学 | A kind of adjustable Tungstate fluorescent powder of glow color and preparation method thereof |
| CN108193274A (en) * | 2017-11-29 | 2018-06-22 | 宁波大学 | A kind of double tungstates scintillation crystal and preparation method thereof |
| CN108193274B (en) * | 2017-11-29 | 2020-06-16 | 宁波大学 | Compound tungstate scintillation crystal and preparation method thereof |
| CN113388398A (en) * | 2021-06-11 | 2021-09-14 | 厦门理工学院 | Eu (Eu)3+Rare earth yttrium-based tungstate doped fluorescent powder and preparation method thereof |
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