CN102093888B - Preparation method and application of warm white fluorescent powder - Google Patents
Preparation method and application of warm white fluorescent powder Download PDFInfo
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- CN102093888B CN102093888B CN201110022624.XA CN201110022624A CN102093888B CN 102093888 B CN102093888 B CN 102093888B CN 201110022624 A CN201110022624 A CN 201110022624A CN 102093888 B CN102093888 B CN 102093888B
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Abstract
The invention provides a preparation method and application of warm white fluorescent powder, relating to the field of photoluminescence materials. The preparation method comprises the following steps: evenly mixing alkali carbonate, alkaline earth carbonate, boric acid and rare earth oxide in a stoichiometric ratio and then putting the mixture in a reaction container; rising the temperature of the reaction container to 550-650 DEG C, keeping the temperature for 24 hours, and then naturally cooling; and putting reactant in the reaction container after repeatedly grinding and evenly mixing, rising the temperature to 750-850 DEG C, keeping the temperature for 72 hours; and then naturally cooling, so that corresponding arrowhead-thulium-europium doped potassium strontium borate product is obtained. In the invention, a single borate substrate is used, and synthesis is carried out in a high temperature soil phase, thus the preparation method has the advantages of fast reaction, low cost and simple equipment, is environment-friendly and energy-saving, and is easy to popularize. The arrowhead-thulium-europium doped potassium strontium borate fluorescent powder has luminous property of warm white light and can be applied to the field of photoluminescence.
Description
Technical field
The present invention relates to embedded photoluminescent material field, particularly relating to the borate that a kind of employing has multiple alkaline-earth metal ions crystallographic site is matrix, carries out the multiple rare earth ion doped synthetic dysprosium thulium europium potassium strontium borate salt KSr that mixes
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+preparation method and the purposes aspect photoluminescence.
Background technology
Photoluminescence refers to ultraviolet, visible ray and infrared ray excited luminescent material and produces luminous phenomenon.The 4th generation green illumination light source LED (photoluminescent diode) utilizes this principle to make.At present, realize white light LEDs mainly by Tricolor LED mixed color method and light transformation approach.Consult document 1: Xu Shu Rong, Su Mianzeng, " luminescence and luminescent material ", Chemical Industry Press, 2004.Wherein light conversion of white light LED is current international main flow scheme, and high-performance optical conversion fluorescence body is critical material wherein.Consult document 2:X.Q.Piao, T.Horikawa, H.Hanzawa, et al., Appl.Phys.Lett.88 (2007) 161908.Cover and be coated with yellow fluorescent powder YAG:Ce by InGaN blue diode
3+the white light LEDs prepared of method cause colour rendering index (CRI, Ra=75) on the low side owing to lacking ruddiness composition, colour temperature higher (CCT=7756K), and with the increase of duration of service, tristimulus coordinates skew.Consult document 3:Jong Seong Bae Won and Jung Hyun Jeon, Appl.Phys.B.95 (2009) 715.For obtaining the warm white illumination that low colour temperature and tristimulus coordinates are stable, in acquisition spectrum, contain red single-matrix warm white fluorescent powder most important.
In the compound that contains alkaline-earth metal ions, carry out when rare earth ion doped, it is easy to replace Sr in lattice
2+or Ba
2+some position, and form luminescence center.And in the time that matrix has the positively charged ion crystallographic site of plurality of replaceable, rare earth ion alternative has selectivity.Consult document 5:L.Wu, X.L.Chen, H.Li, et al., Inorg.Chem.44 (2005) 6409.Because crystal field and the interactional variation of activator of different positions may cause multi-wavelength to launch, thereby can in the matrix with multiple positively charged ion crystallographic site, realize single-matrix white fluorescent.
KSr
4(BO
3)
3in Sr
2+ion has three kinds of crystallographic sites, and we think, by multiple rare earth ion doped in this matrix, can, by adjusting the doping of each rare earth ion, realize the white fluorescent of low colour temperature under ultraviolet excitation, throw light on for warm white LED.
Summary of the invention
One of object of the present invention is to provide warm white fluorescent powder that material that a kind of utilization has the cation position of plurality of replaceable is matrix and preparation method thereof.
Another object of the present invention is to provide the purposes of above-mentioned fluorescent material aspect photoluminescence.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of warm white fluorescent powder is the potassium strontium borate salt KSr that mixes dysprosium thulium europium that to have the borate of multiple alkaline-earth metal ions crystallographic site be matrix
4(BO
3)
3: Dy
3+, Tm
3+, Eu
3+.
It is described that to mix dysprosium thulium europium potassium strontium borate salt be KSr
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+, x in molecular formula, y, the scope of z is 1%≤x≤1.5%, y=0.5%, 0.2%≤z≤3%.
A preparation method for warm white fluorescent powder, is prepared taking a kind of borate with multiple alkaline-earth metal ions crystallographic site as matrix.
The preparation method of described warm white fluorescent powder, in borate structure cell used, alternative positively charged ion has three kinds of symmetric cases of difference.
The preparation method of described warm white fluorescent powder, with three kinds of different symmetric cases of rare earth ion doped place of cation.
The preparation method of described warm white fluorescent powder, specifically comprises the following steps:
By alkaline carbonate, alkaline earth metal carbonate, after mixing, rare earth oxide and boric acid puts into reaction vessel, the temperature of reaction vessel is risen to 550-650 DEG C, and then insulation makes its naturally cooling, takes out after product is placed in the even grinding of mortar and again puts into reaction vessel, be heated to 750-850 DEG C, after insulation, naturally cool to room temperature, obtain corresponding fluorescent material.
Described alkaline carbonate, alkaline earth metal carbonate purity are not less than 99.9%; Rare earth oxide purity is not less than 99.99%, and the purity of boric acid is not less than 99.5%; Described alkaline carbonate is salt of wormwood, and alkaline earth metal carbonate is Strontium carbonate powder, and described ratio is 1: 3.8-4.2 mol ratio.
Described reaction vessel is platinum alloy crucible or corundum crucible; Described mortar is agate mortar.
The purposes of described warm white fluorescent powder, the application of described fluorescent material aspect photoluminescence.
The described potassium strontium borate salt of mixing dysprosium thulium europium is a kind of warm white fluorescent powder, and under ultraviolet excitation, transmitting colour temperature is lower than the white light of 5000K.
Compared with prior art, the present invention carries out the rare earth ion doped warm white fluorescent powder that synthesizes in alkali metal alkaline earth metal borate matrix, main innovate point is to adopt " single-matrix ", preferentially property while utilizing rare earth ion to replace three kinds of different positionss of alkaline-earth metal ions, adopt three kinds of different rare earth ions, in the high temperature of 750-850 DEG C, warm white fluorescent powder is prepared in reaction.
Reaction product purity of the present invention is high, with low cost, equipment simple, be easy to popularization.
The dysprosium thulium europium potassium strontium borate salt (KSr that mixes provided by the invention
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+) purposes be for photoluminescence field.This application is that the UV-irradiation of certain wavelength is mixed after dysprosium thulium europium potassium strontium borate salt, and this is mixed dysprosium thulium europium potassium strontium borate salt and launches the transmitting light wave that is different from incident light.
The dysprosium thulium europium potassium strontium borate salt of mixing provided by the invention, through fluorometric investigation, is launched the white fluorescent (warm white) of low colour temperature.Be applied to the effect that photoluminescence field has luminouslighting.
Brief description of the drawings:
Fig. 1 is the KSr that adopts this preparation method to make
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+x ray diffracting spectrum;
Fig. 2 is the KSr that adopts this preparation method to make
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+utilizing emitted light spectrogram under 356nm excites;
Fig. 3 is the KSr that adopts this preparation method to make
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+excite lower transmitting spectrogram at 361nm;
Fig. 4 is institute's test sample product tristimulus coordinates distribution plans (CIE-1931) under 356nm ultraviolet excitation;
Fig. 5 is institute's test sample product tristimulus coordinates distribution plans (CIE-1931) under 361nm ultraviolet excitation;
As can be seen from Figure 1, synthesized fluorescent material is pure phase material, the various impurity such as oxide-free, and the matrix structure of fluorescent material does not change because of doping.
From Fig. 2,3, can find out, under different wave length optical excitation, by changing Eu
3+doping, all can obtain the warm white transmitting of low colour temperature.
From Fig. 4,5, can find out the KSr making by this preparation method
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+emmission spectrum colourity under 361nm and 356nm ultraviolet excitation is positioned at warm white region.
In Fig. 4, a is KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 2%Eu
3+; B is KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 3%Eu
3+; C is KSr
4(BO
3)
3: 1.5%Dy
3+, 0.5%Tm
3+, 2%Eu
3+
In Fig. 5, d is KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 0.2%Eu
3+; E is KSr
4(BO
3)
3: 1.5%Dy
3+, 0.5%Tm
3+, 0.2%Eu
3+
Embodiment
Embodiment 1
Take 0.005mol purity and be 99.9% salt of wormwood, 0.0386mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0002mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.0004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 550 DEG C with the speed of 4 DEG C/min from room temperature, and 550 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 800 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 2%Eu
3+powder.
Embodiment 2
Take 0.005mol purity and be 99.9% salt of wormwood, 0.0382mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0002mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.0006mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 550 DEG C with the speed of 4 DEG C/min from room temperature, and 550 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 800 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 3%Eu
3+powder.
Embodiment 3
Take 0.005mol purity and be 99.9% salt of wormwood, 0.0384mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0003mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.0004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 550 DEG C with the speed of 4 DEG C/min from room temperature, and 550 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 800 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1.5%Dy
3+, 0.5%Tm
3+, 2%Eu
3+powder.
Embodiment 4
Take 0.005mol purity and be 99.9% salt of wormwood, 0.0386mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0002mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.0004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 600 DEG C with the speed of 4 DEG C/min from room temperature, and 600 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 850 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 2%Eu
3+powder.
Embodiment 5
Take 0.005mol purity and be 99.9% salt of wormwood, 0.0382mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0002mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.0006mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 600 DEG C with the speed of 4 DEG C/min from room temperature, and 600 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 850 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 3%Eu
3+powder.
Embodiment 6
Take 0.005mol purity and be 99.9% salt of wormwood, 0.0384mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0003mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.0004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 600 DEG C with the speed of 4 DEG C/min from room temperature, and 600 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 850 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1.5%Dy
3+, 0.5%Tm
3+, 2%Eu
3+powder.
Embodiment 7
Take 0.005mol purity and be 99.9% salt of wormwood, 0.03932mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0002mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.00004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 550 DEG C with the speed of 4 DEG C/min from room temperature, and 550 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 800 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 0.2%Eu
3+powder.
Embodiment 8
Take 0.005mol purity and be 99.9% salt of wormwood, 0.03912mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0003mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.00004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 550 DEG C with the speed of 4 DEG C/min from room temperature, and 550 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 800 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1.5%Dy
3+, 0.5%Tm
3+, 0.2%Eu
3+powder.
Embodiment 9
Take 0.005mol purity and be 99.9% salt of wormwood, 0.03932mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0002mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.00004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 600 DEG C with the speed of 4 DEG C/min from room temperature, and 600 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 850 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1%Dy
3+, 0.5%Tm
3+, 0.2%Eu
3+powder.
Embodiment 10
Take 0.005mol purity and be 99.9% salt of wormwood, 0.03912mol purity is 99.9% Strontium carbonate powder, 0.03mol purity is 99.5% boric acid, 0.0003mol purity is 99.99% dysprosium oxide, 0.0001mol purity is 99.99% trioxide, 0.00004mol purity is 99.99% europium sesquioxide, put into after mortar grinds evenly and be respectively charged into corundum crucible and platinum alloy crucible, crucible is placed in to retort furnace, rise to 600 DEG C with the speed of 4 DEG C/min from room temperature, and 600 DEG C of constant temperature 24 hours, be then naturally cooled to room temperature.After taking out sample and being placed in agate mortar and again fully grinding, put back in crucible, put into retort furnace, be heated to 850 DEG C, constant temperature 72 hours, naturally after cooling, take out again grind even.Two kinds of crucibles all can obtain white object product KSr
4(BO
3)
3: 1.5%Dy
3+, 0.5%Tm
3+, 0.2%Eu
3+powder.
Embodiment 11
Measure the photoluminescent property of mixing dysprosium thulium europium potassium strontium borate salt sample that embodiment 1-6 obtains.Mensuration xenon source, power 450W, step-length 1nm, voltage 950V, grating 1nm, wavelength 356nm.By specimen holder, between two quartz plates, the thick 1mm of sample strip, selectes after condition, and excitation light irradiation sample, gathers spectral line of emission, obtains effective warm white transmitting.
Embodiment 12
Measure the photoluminescent property of mixing europium Sodium Tetraborate strontium barium salt sample that embodiment 7-10 obtains.Mensuration xenon source, power 450W, step-length 1nm, voltage 950V, grating 1nm, wavelength 361nm.By specimen holder, between two quartz plates, the thick 1mm of sample strip, selectes after condition, and excitation light irradiation sample, gathers spectral line of emission, obtains effective warm white transmitting.
Above example shows, with salt of wormwood, and Strontium carbonate powder, boric acid and dysprosium oxide, trioxide, europium sesquioxide is raw material, all can effectively synthesize and mix accordingly dysprosium thulium europium potassium strontium borate salt fluorescent material.Be noted that the above embodiments just illustrate the present invention with concrete example, and should not be limitation of the present invention.Meanwhile, those of ordinary skill in the art knows, on design of the present invention basis, the various modifications and variations that the present invention is carried out are all at the protection domain of this patent.
Those of ordinary skill in the art may obtain mixing the sample of dysprosium thulium europium potassium strontium borate salt, and is applied in other optical application, and these all do not exceed the spirit and scope of the present invention.
Claims (7)
1. a warm white fluorescent powder, is characterized in that, described fluorescent material is to have the potassium strontium borate salt KSr that mixes dysprosium thulium europium that the borate of multiple alkaline-earth metal ions crystallographic site is matrix
4(BO
3)
3: Dy
3+, Tm
3+, Eu
3+; It is described that to mix dysprosium thulium europium potassium strontium borate salt be KSr
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+, x in molecular formula, y, the scope of z is 1%≤x≤1.5%, y=0.5%, 0.2%≤z≤3%.
2. a preparation method for warm white fluorescent powder as claimed in claim 1, is characterized in that, is prepared taking a kind of borate with multiple alkaline-earth metal ions crystallographic site as matrix;
Specifically comprise the following steps:
By alkaline carbonate, alkaline earth metal carbonate, after mixing, rare earth oxide and boric acid puts into reaction vessel, the temperature of reaction vessel is risen to 550-650 DEG C, and then insulation makes its naturally cooling, takes out after product is placed in the even grinding of mortar and again puts into reaction vessel, be heated to 750-850 DEG C, after insulation, naturally cool to room temperature, obtain corresponding fluorescent material; Described alkaline carbonate, alkaline earth metal carbonate purity are not less than 99.9%; Rare earth oxide purity is not less than 99.99%, and the purity of boric acid is not less than 99.5%; Described alkaline carbonate is salt of wormwood, and alkaline earth metal carbonate is Strontium carbonate powder, and its ratio is 1:3.8-4.2 mol ratio.
3. the preparation method of warm white fluorescent powder as claimed in claim 2, is characterized in that, in borate structure cell used, alternative positively charged ion has three kinds of symmetric cases of difference.
4. the preparation method of the warm white fluorescent powder as described in claim 2 or 3 any one, is characterized in that, with three kinds of different symmetric cases of rare earth ion doped place of cation.
5. the preparation method of warm white fluorescent powder as claimed in claim 2, is characterized in that, described reaction vessel is platinum alloy crucible or corundum crucible; Described mortar is agate mortar.
6. a purposes for warm white fluorescent powder claimed in claim 1, the application of described fluorescent material aspect photoluminescence.
7. the purposes of warm white fluorescent powder as claimed in claim 6, is characterized in that, described in mix dysprosium thulium europium potassium strontium borate salt be a kind of warm white fluorescent powder, under ultraviolet excitation, transmitting colour temperature is lower than the white light of 5000K.
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| CN102321477A (en) * | 2011-07-25 | 2012-01-18 | 中国科学院上海光学精密机械研究所 | Cerium-ion-doped borate blue fluorescent powder and preparation method thereof |
| CN103254898A (en) * | 2013-03-28 | 2013-08-21 | 中国科学院福建物质结构研究所 | Thulium and dysprosium co-doped sodium yttrium tungstate white luminescent material and its use |
| CN104059640B (en) * | 2014-07-08 | 2016-09-28 | 厦门大学 | A kind of borate fluorescent powder substrate and the preparation method of fluorescent material |
| CN104861977A (en) * | 2015-05-25 | 2015-08-26 | 湖南爱德光电新材料有限公司 | White vanadium phosphate phosphor and preparation method thereof |
| CN105062472B (en) * | 2015-08-26 | 2017-03-29 | 南开大学 | A kind of preparation method and application of the blue colour fluorescent powder for warm white LED |
| CN105623660B (en) * | 2016-03-17 | 2018-04-03 | 中南大学 | The warm white fluorescent material that a kind of ultraviolet LED excites |
| CN106590638B (en) * | 2016-11-30 | 2019-03-19 | 重庆理工大学 | A kind of potassium strontium borate fluorescent powder and high-temperature solid phase preparation method adulterating praseodymium ion |
| CN107057700A (en) * | 2017-05-27 | 2017-08-18 | 陕西科技大学 | A kind of boric acid lanthanum-strontium base white emitting fluorescent powder of dysprosium doped three and preparation method thereof |
| CN115820255B (en) * | 2022-12-21 | 2023-09-26 | 云南大学 | Single-matrix warm white fluorescent powder and preparation method thereof |
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