CN102093888A - 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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- CN102093888A CN102093888A CN201110022624XA CN201110022624A CN102093888A CN 102093888 A CN102093888 A CN 102093888A CN 201110022624X A CN201110022624X A CN 201110022624XA CN 201110022624 A CN201110022624 A CN 201110022624A CN 102093888 A CN102093888 A CN 102093888A
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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 the 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 thereof.
Background technology
Photoluminescence is meant with ultraviolet, visible light and infrared ray excited luminescent material and produces luminous phenomenon.The 4th generation green illumination light source LED (photoluminescence diode) utilizes this principle to make.At present, realize that white light LEDs is mainly by Tricolor LED mixed color method and light transformation approach.Consult document 1: Xu Shu Rong, Su Mianceng, " 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 then is a critical material wherein.Consult document 2:X.Q.Piao, T.Horikawa, H.Hanzawa, et al., Appl.Phys.Lett.88 (2007) 161908.Cover by the InGaN blue diode and to be coated with yellow fluorescent powder YAG:Ce
3+Method preparation white light LEDs since lack the ruddiness composition cause colour rendering index on the low side (CRI, Ra=75), 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 stable warm white illumination of low colour temperature and tristimulus coordinates, it is most important to obtain to contain red single-matrix warm white fluorescent material in the spectrum.
Carry out in containing the compound of alkaline-earth metal ions when rare earth ion doped, it is easy to replace Sr in the lattice
2+Or Ba
2+Some position, and form luminescence center.And when matrix had the positively charged ion crystallographic site of plurality of replaceable, rare earth ion alternative had selectivity.Consult document 5:L.Wu, X.L.Chen, H.Li, et al., Inorg.Chem.44 (2005) 6409.Because the crystal field and the interactional variation of activator of different positions may cause the multi-wavelength to launch, thereby can realize the single-matrix white fluorescent in the matrix with multiple positively charged ion crystallographic site.
KSr
4(BO
3)
3In Sr
2+Ion has three kinds of crystallographic sites, and we think, with multiple rare earth ion doped in this matrix, can realize the white fluorescent of low colour temperature under ultraviolet excitation by adjusting the doping of each rare earth ion, are used for the warm white LED illumination.
Summary of the invention
One of purpose of the present invention provides the material that a kind of utilization has the cation position of plurality of replaceable and is warm white fluorescent material of matrix and preparation method thereof.
Another object of the present invention provides 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 material is the potassium strontium borate salt KSr that mixes dysprosium thulium europium of matrix for the borate with multiple alkaline-earth metal ions crystallographic site
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 the molecular formula, y, the scope of z is 1%≤x≤1.5%, y=0.5%, 0.2%≤z≤3%.
A kind of preparation method of warm white fluorescent material is that matrix is prepared with a kind of borate with multiple alkaline-earth metal ions crystallographic site.
The preparation method of described warm white fluorescent material, alternative positively charged ion has three kinds of symmetric cases of difference in the used borate structure cell.
The preparation method of described warm white fluorescent material is with three kinds of different symmetric cases of rare earth ion doped place of cation.
The preparation method of described warm white fluorescent material specifically may further comprise the steps:
With 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 ℃, and insulation makes its naturally cooling then, takes out and puts into reaction vessel once more after product places mortar evenly to grind, be heated to 750-850 ℃, after the insulation, naturally cool to room temperature, promptly 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 a salt of wormwood, and alkaline earth metal carbonate is a Strontium carbonate powder, and described ratio is 1: the 3.8-4.2 mol ratio.
Described reaction vessel is platinum alloy crucible or corundum crucible; Described mortar is an agate mortar.
The purposes of described warm white fluorescent material, 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 material, and under ultraviolet excitation, the emission 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 material that synthesizes on alkali metal alkaline earth metal borate matrix, main innovate point is to adopt " single-matrix ", property according to qualifications when utilizing rare earth ion that three kinds of different positionss of alkaline-earth metal ions are replaced, adopt three kinds of different rare earth ions, in 750-850 ℃ high temperature, prepared in reaction goes out warm white fluorescent material.
Reaction product purity height of the present invention, with low cost, equipment be simple, be easy to promote.
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 to be used for the photoluminescence field.This application is that this was mixed dysprosium thulium europium potassium strontium borate salt and launches the emission light wave that is different from incident light after the UV-irradiation of certain wavelength was mixed dysprosium thulium europium potassium strontium borate salt.
The dysprosium thulium europium potassium strontium borate salt of mixing provided by the invention is through fluorometric investigation, and the white fluorescent (warm white) of colour temperature is hanged down in emission.Be applied to the photoluminescence field and have the effect of luminouslighting.
Description of 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+Emmission spectrum figure 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 emission spectrogram down at 361nm;
Fig. 4 is institute's test sample product tristimulus coordinates distribution plans (CIE-1931) under the 356nm ultraviolet excitation;
Fig. 5 is institute's test sample product tristimulus coordinates distribution plans (CIE-1931) under the 361nm ultraviolet excitation;
As can be seen from Figure 1, institute's synthetizing phosphor powder is the pure phase material, the various impurity such as oxide-free, and the matrix structure of fluorescent material does not change because mix.
From Fig. 2,3, can find out, under the different wave length optical excitation, by changing Eu3+Doping, all can obtain the warm white emission of low colour temperature.
From Fig. 4,5, can find out the KSr that makes with this preparation method4(BO
3)
3:xDy
3+，yTm
3+，zEu
3+Emission spectrum colourity under 361nm and 356nm ultraviolet excitation is positioned at the warm white zone.
Among Fig. 4, a is KSr4(BO
3)
3:1％Dy
3+，0.5％Tm
3+，2％Eu
3+ B is KSr4(BO
3)
3:1％Dy
3+，0.5％Tm
3+，3％Eu
3+ C is KSr4(BO
3)
3:1.5％Dy
3+，0.5％Tm
3+，2％Eu
3+
Among Fig. 5, d is KSr4(BO
3)
3:1％Dy
3+，0.5％Tm
3+，0.2％Eu
3+ E is KSr4(BO
3)
3:1.5％Dy
3+，0.5％Tm
3+，0.2％Eu
3+
Embodiment
Take by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 550 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 550 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 800 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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.
Take by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 550 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 550 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 800 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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.
Take by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 550 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 550 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 800 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 600 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 600 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 850 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 600 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 600 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 850 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 600 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 600 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 850 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 550 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 550 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 800 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 550 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 550 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 800 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 600 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 600 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 850 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 by weighing 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 and be respectively charged into corundum crucible and platinum alloy crucible after mortar grinds evenly, crucible is placed retort furnace, rise to 600 ℃ with 4 ℃/minute speed from room temperature, and, be cooled to room temperature then naturally 600 ℃ of constant temperature 24 hours.The taking-up sample is put back in the crucible after placing agate mortar fully to grind once more, puts into retort furnace, is heated to 850 ℃, constant temperature 72 hours, and cooling back taking-up regrinding is even naturally.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 resulting photoluminescent property of mixing dysprosium thulium europium potassium strontium borate salt sample of embodiment 1-6.Measure and use xenon source, power 450W, step-length 1nm, voltage 950V, grating 1nm, wavelength 356nm.With specimen holder between two quartz plates, the thick 1mm of sample strip, after the selected condition, the excitation light irradiation sample is gathered spectral line of emission, obtains effective warm white emission.
Embodiment 12
Measure the resulting photoluminescent property of mixing europium Sodium Tetraborate strontium barium salt sample of embodiment 7-10.Measure and use xenon source, power 450W, step-length 1nm, voltage 950V, grating 1nm, wavelength 361nm.With specimen holder between two quartz plates, the thick 1mm of sample strip, after the selected condition, the excitation light irradiation sample is gathered spectral line of emission, obtains effective warm white emission.
Above example shows, with salt of wormwood, and Strontium carbonate powder, boric acid and dysprosium oxide, trioxide, europium sesquioxide are raw material, all can effectively synthesize to mix dysprosium thulium europium potassium strontium borate salt fluorescent material accordingly.Be noted that the above embodiments just illustrate the present invention with concrete example, and should not be limitation of the present invention.Simultaneously, those of ordinary skill in the art knows, on design of the present invention basis, to various modifications and variations that the present invention carried out 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 on other optical application, and these all do not exceed design of the present invention and scope.
Claims (10)
1. a warm white fluorescent material is characterized in that, described fluorescent material is that the borate with multiple alkaline-earth metal ions crystallographic site is the potassium strontium borate salt KSr that mixes dysprosium thulium europium of matrix
4(BO
3)
3: Dy
3+, Tm
3+, Eu
3+
2. warm white fluorescent material as claimed in claim 1 is characterized in that, described to mix dysprosium thulium europium potassium strontium borate salt be KSr
4(BO
3)
3: xDy
3+, yTm
3+, zEu
3+, x in the molecular formula, y, the scope of z is 1%≤x≤1.5%, y=0.5%, 0.2%≤z≤3%.
3. the preparation method of a warm white fluorescent material is characterized in that, is that matrix is prepared with a kind of borate with multiple alkaline-earth metal ions crystallographic site.
4. the preparation method of warm white fluorescent material as claimed in claim 3 is characterized in that, alternative positively charged ion has three kinds of symmetric cases of difference in the used borate structure cell.
5. as the preparation method of claim 3 or 4 each described warm white fluorescent material, it is characterized in that, with three kinds of different symmetric cases of rare earth ion doped place of cation.
6. the preparation method of warm white fluorescent material as claimed in claim 3 specifically may further comprise the steps:
With 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 ℃, and insulation makes its naturally cooling then, takes out and puts into reaction vessel once more after product places mortar evenly to grind, be heated to 750-850 ℃, after the insulation, naturally cool to room temperature, promptly obtain corresponding fluorescent material.
7. the preparation method of warm white fluorescent material as claimed in claim 6 is characterized in that, 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 a salt of wormwood, and alkaline earth metal carbonate is a Strontium carbonate powder, and described ratio is 1: the 3.8-4.2 mol ratio.
8. the preparation method of warm white fluorescent material as claimed in claim 6 is characterized in that, described reaction vessel is platinum alloy crucible or corundum crucible; Described mortar is an agate mortar.
9. the purposes of the described warm white fluorescent material of claim 1, the application of described fluorescent material aspect photoluminescence.
10. the purposes of warm white fluorescent material as claimed in claim 9 is characterized in that, the described potassium strontium borate salt of mixing dysprosium thulium europium is a kind of warm white fluorescent material, and under ultraviolet excitation, the emission colour temperature is lower than the white light of 5000K.
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Cited By (9)
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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 |
| CN104059640A (en) * | 2014-07-08 | 2014-09-24 | 厦门大学 | Preparation methods of borate fluorescent powder matrix and fluorescent powder |
| 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 |
| CN105062472A (en) * | 2015-08-26 | 2015-11-18 | 南开大学 | Preparing method and application of blue fluorescent powder for warm white light LED |
| CN105623660A (en) * | 2016-03-17 | 2016-06-01 | 中南大学 | Warm white fluorescent powder excited by ultraviolet LED |
| CN106590638A (en) * | 2016-11-30 | 2017-04-26 | 重庆理工大学 | Praseodymium ion-doped potassium strontium borate fluorescent powder and high-temperature solid-phase preparation method |
| 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 |
| CN115820255A (en) * | 2022-12-21 | 2023-03-21 | 云南大学 | Single-matrix warm white fluorescent powder and preparation method thereof |
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