CN109777419A - Phosphoric acid zinc-magnesium single-substrate white fluorescent powder and preparation method thereof - Google Patents

Phosphoric acid zinc-magnesium single-substrate white fluorescent powder and preparation method thereof Download PDF

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Publication number
CN109777419A
CN109777419A CN201910245014.2A CN201910245014A CN109777419A CN 109777419 A CN109777419 A CN 109777419A CN 201910245014 A CN201910245014 A CN 201910245014A CN 109777419 A CN109777419 A CN 109777419A
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phosphoric acid
solution
acid zinc
fluorescent powder
white fluorescent
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徐梦姣
刘艳红
雒婉霞
王鲁香
贾殿赠
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Xinjiang University
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Xinjiang University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

It is a kind of phosphoric acid zinc-magnesium single-substrate white fluorescent powder and preparation method thereof, the former chemical constitution formula is MgZn the present invention relates to rare earth luminescent material technical field2(PO4)2:aCe3+,bDy3+, by Mg (NO3)2·6H2O、Zn(NO3)2·6H2O、Ce(NO3)3·6H2O、Dy(NO3)3·6H2O and (NH4)2HPO4It is dissolved in after deionized water obtains sediment and calcines, obtain phosphoric acid zinc-magnesium single-substrate white fluorescent powder.The present invention adulterates Ce for the first time using phosphoric acid zinc-magnesium as matrix3+And Dy3+, product chemical property obtained is stable, low raw-material cost, while using coprecipitation, preparation process is easy, and calcination temperature is low during the preparation process, and production process is safe and environment-friendly, energy saving, simple process, is made that material dopant profiles in product are uniform, and brightness is high.

Description

Phosphoric acid zinc-magnesium single-substrate white fluorescent powder and preparation method thereof
Technical field
It is a kind of phosphoric acid zinc-magnesium single-substrate white fluorescent powder and its preparation the present invention relates to rare earth luminescent material technical field Method.
Background technique
White light emitting diode (light emitting diode, LED) is illuminated with traditional incandescent lamp, energy-saving lamp etc. Light source is compared, and has that nontoxic, efficient, energy saving, small in size, the service life is long, all solid state, fast response time, operating voltage are low, shock resistance Can be good many advantages, such as, is widely used in illumination and display field.There are mainly two types of realization sides for current commercialized white light LEDs Method, one is InGaN blue light-emitting diode collocation Yellow light emitting fluorescent powder YAG:Ce, there are devices with driving electricity for this method It presses different with the coating thickness of fluorescent powder and changes, colour rendering index is relatively low, and color reducibility is bad, and temperature raising leads to color drift The problems such as.Another kind is ultraviolet/near ultraviolet excitated red-green-blue fluorescent powder, and this method is due between phosphor mixture Color reabsorbs, and it is difficult to there is a problem of that energy loss, proportion regulate and control, and the rate of ageing of different fluorescent powders is different, will affect To the luminous efficiency and color rendition degree of device, while increasing manufacturing cost.Therefore, research is based on ultraviolet/near ultraviolet excitated Single-matrix white fluorescent powder very it is necessary to.
Single-substrate white fluorescent powder reported at present has: 2004, J. S. Kim et al. passed through Solid phase synthesis Ba3MgSi2O8: Eu2+, Mn2+Single-substrate white fluorescent powder (Appl. Phys. Lett. 84,2931 (2004)).2010 Year, He Yuyang, Song Yan Yan of Xi'an University of Technology et al. have invented a kind of " single-phase rare earth vanadium phosphate white fluorescent powder for mercury lamp And preparation method thereof " (Chinese patent, patent publication No. CN101974334A), it was recently reported that a kind of single matrix vanadium phosphorus of activated by dysprosium Hydrochlorate white hair luminescent material.2012, Wang Jiyou, the Wang Jianbo of Beijing University of Technology invented a kind of " dysprosium thulium co-doped with the silicon phosphorus aluminic acid Salt white emitting fluorescent powder and preparation method thereof " (Chinese patent, patent publication No. CN103074059A).2015, Shaanxi science and technology A kind of Ning Qingju of university, Cao Shuyao et al. invention " Eu3+,Dy3+,Tb3+Activate β-Li2TiO3Single-matrix white fluorescent powder And preparation method " (Chinese patent, patent publication No. CN104974753A), it was recently reported that a kind of Eu3+,Dy3+,Tb3+The list of activation Matrix white luminescent material.2017, the Wu Xiulan of Shaanxi Tech Univ, text of an annotated book girl et al. invention was " using vanadate as matrix Dysprosium doped white fluorescent powder and preparation method thereof " (Chinese patent, patent publication No. CN107384391A), it was recently reported that it is a kind of Using vanadate as the dysprosium doped white light emitting material of matrix.
Commercial fluorescent powder is all made of high temperature solid-state method preparation in recent years, and the precursor preparation of the method is by simple Mechanical lapping is mixed, and activator is unevenly distributed, and will lead to light-emitting phosphor low efficiency, is influenced it and is sent out in use Optical property.
Summary of the invention
The present invention provides a kind of phosphoric acid zinc-magnesium single-substrate white fluorescent powders and preparation method thereof, overcome above-mentioned existing skill The deficiency of art can effectively solve light-emitting phosphor low efficiency, the problem of luminescent properties difference that prior art preparation obtains.
Technical solution of the present invention first is that being realized by following measures: a kind of phosphoric acid zinc-magnesium single-substrate white fluorescence Powder, chemical constitution formula MgZn2(PO4)2: aCe3+, bDy3+, wherein a is that 0.02 to 0.08, b is 0.0004 to 0.004, A, b is molar fraction.
Here is further optimization or/and improvement of one of the above technical solutions of the invention:
Above-mentioned phosphoric acid zinc-magnesium single-substrate white fluorescent powder is prepared by the following method: the first step, will according to stoichiometric ratio The desired amount of Mg (NO3)2·6H2O、Zn(NO3)2·6H2O、Ce(NO3)3·6H2O、Dy(NO3)3·6H2O is dissolved in deionized water Obtain the first solution;Second step, by the desired amount of (NH4)2HPO4It is dissolved in deionized water and obtains the second solution;Third step, by Two solution are added dropwise to dropwise to be uniformly mixed and is stirred in the first solution, and sediment is obtained;Sediment is stood 3 hours by the 4th step To 8 hours, after being filtered under conditions of pressure is 0.05MPa to 0.08MPa, washed 3 times to 5 times using deionized water, 100 DEG C to drying under the conditions of 120 DEG C, precursor powder is obtained;5th step, by precursor powder in N2For 95%, H2For 5% weak reduction In atmosphere, it is warming up under conditions of temperature is 700 DEG C to 900 DEG C and calcines natural cooling after 1h to 3 h, obtain phosphoric acid zinc-magnesium list Matrix white fluorescent powder.
In above-mentioned third step, the second solution be added dropwise to dropwise the rate being mixed in the first solution be 500r/min extremely 600r/min。
Above-mentioned precursor powder is in N2For 95%, H2For in 5% weakly reducing atmosphere, the rate of heating is 5 DEG C/min to 10 ℃/min。
Technical solution of the present invention second is that being realized by following measures: a kind of phosphoric acid zinc-magnesium single-substrate white fluorescence The preparation method of powder prepares progress: the first step by the following method, according to stoichiometric ratio by the desired amount of Mg (NO3)2· 6H2O、Zn(NO3)2·6H2O、Ce(NO3)3·6H2O、Dy(NO3)3·6H2O is dissolved in deionized water and obtains the first solution;Second Step, by the desired amount of (NH4)2HPO4It is dissolved in deionized water and obtains the second solution;Second solution is added dropwise to by third step dropwise It is uniformly mixed and stirs in first solution, obtain sediment;Sediment is stood 3 hours to 8 hours, is in pressure by the 4th step After being filtered under conditions of 0.05MPa to 0.08MPa, washed 3 times to 5 times using deionized water, under the conditions of 100 DEG C to 120 DEG C Drying, obtains precursor powder;5th step, by precursor powder in N2For 95%, H2To be warming up to temperature in 5% weakly reducing atmosphere Degree calcines natural cooling after 1h to 3 h under conditions of being 700 DEG C to 900 DEG C, obtains phosphoric acid zinc-magnesium single-substrate white fluorescent powder.
In above-mentioned third step, the second solution be added dropwise to dropwise the rate being mixed in the first solution be 500r/min extremely 600r/min。
Above-mentioned precursor powder is in N2For 95%, H2For in 5% weakly reducing atmosphere, the rate of heating is 5 DEG C/min to 10 ℃/min。
The present invention adulterates Ce for the first time using phosphoric acid zinc-magnesium as matrix3+And Dy3+, product chemical property obtained is stable, raw material It is low in cost, while coprecipitation is used, preparation process is easy, and calcination temperature is low during the preparation process, production process safety, ring It protects, energy saving, simple process, material dopant profiles are uniform in obtained product, and brightness is high.
Detailed description of the invention
Attached drawing 1 is the XRD diagram and MgZn of phosphoric acid zinc-magnesium single-substrate white fluorescent powder of the present invention2(PO4)2Standard card JCPDS NO.83-1203。
Attached drawing 2 is the exciting light spectrogram and launching light spectrogram of phosphoric acid zinc-magnesium single-substrate white fluorescent powder of the present invention.
Attached drawing 3 is the CIE diagram of phosphoric acid zinc-magnesium single-substrate white fluorescent powder of the present invention.
Specific embodiment
The present invention is not limited by the following examples, can determine according to the technique and scheme of the present invention with actual conditions specific Embodiment.It is previously mentioned various chemical reagent and chemical article in the present invention unless otherwise specified, is public in the prior art Know common chemical reagent and chemical article;Percentage in the present invention does not have specified otherwise such as, is mass percent;This hair It is the aqueous solution that solvent is water, for example, hydrochloric acid solution is aqueous hydrochloric acid solution if the solution in bright is without specified otherwise;This Room temperature, room temperature in invention refer generally to 15 DEG C to 25 DEG C of temperature, are commonly defined as 25 DEG C.
The present invention will be further described below with reference to examples:
Embodiment 1: the phosphoric acid zinc-magnesium single-substrate white fluorescent powder, chemical constitution formula MgZn2(PO4)2: aCe3+, bDy3+, In, a is that 0.02 to 0.08, b is 0.0004 to 0.004, and a, b are molar fraction.
Embodiment 2: the phosphoric acid zinc-magnesium single-substrate white fluorescent powder, chemical constitution formula MgZn2(PO4)2: aCe3+, bDy3 +, wherein a is 0.02 or 0.08, and b is 0.0004 or 0.004, and a, b are molar fraction.
Embodiment 3: the phosphoric acid zinc-magnesium single-substrate white fluorescent powder is prepared by the following method: the first step, according to change Metering is learned than by the desired amount of Mg (NO3)2·6H2O(AR), Zn (NO3)2·6H2O(AR), Ce (NO3)3·6H2O(AR), Dy (NO3)3·6H2O(AR it) is dissolved in deionized water and obtains the first solution;Second step, by the desired amount of (NH4)2HPO4(AR) it dissolves The second solution is obtained in deionized water;Second solution is added dropwise to dropwise and is uniformly mixed and stirs in the first solution, obtains by third step To sediment;Sediment is stood 3 hours to 8 hours, filtered under conditions of pressure is 0.05MPa to 0.08MPa by the 4th step Afterwards, it is washed 3 times to 5 times using deionized water, is dried under the conditions of 100 DEG C to 120 DEG C, obtain precursor powder;5th step, will Precursor powder is in N2For 95%, H2It is calcined in 5% weakly reducing atmosphere, to be warming up under conditions of temperature is 700 DEG C to 900 DEG C Natural cooling after 1h to 3 h obtains phosphoric acid zinc-magnesium single-substrate white fluorescent powder.
The present invention adulterates trivalent cerium ion and trivalent dysprosium ion for the first time using phosphoric acid zinc-magnesium as matrix, using co-precipitation legal system Standby burst of ultraviolel white emitting fluorescent powder out.The present invention uses coprecipitation, material can be made uniformly to mix, keep the ion of activator equal Even doping plays a driving role to the reaction uniformity of calcination stage, reduces into Xiang Wendu;Preparation process is simple, safe simultaneously, right The luminous intensity of made fluorescent material, uniformity of chromaticity have promotion.There are many fluorescent powder matrix, mainly there is silicate, aluminic acid Salt, phosphate, vanadate, borate, tungstates etc..Wherein phosphate is with cheap, crystal structure is stable, the heat that shines is steady The qualitative high, advantages such as calcination temperature is low, are the ideal materials as luminescent ceramic matrix.
Embodiment 4: the phosphoric acid zinc-magnesium single-substrate white fluorescent powder is prepared by the following method: the first step, according to change Metering is learned than by the desired amount of Mg (NO3)2·6H2O(AR), Zn (NO3)2·6H2O(AR), Ce (NO3)3·6H2O(AR), Dy (NO3)3·6H2O(AR it) is dissolved in deionized water and obtains the first solution;Second step, by the desired amount of (NH4)2HPO4(AR) it dissolves The second solution is obtained in deionized water;Second solution is added dropwise to dropwise and is uniformly mixed and stirs in the first solution, obtains by third step To sediment;Sediment is stood 3 hours or 8 hours, filtered under conditions of pressure is 0.05MPa or 0.08MPa by the 4th step Afterwards, it is washed 3 times or 5 times using deionized water, is dried under the conditions of 100 DEG C or 120 DEG C, obtain precursor powder;5th step, will Precursor powder is in N2For 95%, H2It is calcined in 5% weakly reducing atmosphere, to be warming up under conditions of temperature is 700 DEG C or 900 DEG C Natural cooling after 1h or 3 h obtains phosphoric acid zinc-magnesium single-substrate white fluorescent powder.
Embodiment 5: as the optimization of above-described embodiment, in third step, the second solution is added dropwise in the first solution dropwise and mixes The rate for closing stirring is 500r/min to 600r/min.
Embodiment 6: as the optimization of above-described embodiment, precursor powder is in N2For 95%, H2For in 5% weakly reducing atmosphere, The rate of heating is 5 DEG C/min to 10 DEG C/min.
Embodiment 7: the phosphoric acid zinc-magnesium single-substrate white fluorescent powder is prepared by the following method: the first step, by institute 2.6412g Mg(NO3)2·6H2O(AR), 5.9498g Zn (NO3)2·6H2O(AR), 0.1737g Ce (NO3)3·6H2O (AR), 0.0018g Dy (NO3)3·6H2O(AR it) is dissolved in 200ml deionized water and obtains the first solution;Second step, will 2.6412g (NH4)2HPO4(AR) it is dissolved in deionized water and obtains the second solution;Second solution is added dropwise to by third step dropwise It is uniformly mixed and stirs in one solution, obtain sediment, wherein the second solution is added dropwise to mixing in the first solution dropwise Rate is 500r/min;Sediment is stood 5 hours, after filtering under conditions of pressure is 0.05MPa, uses nothing by the 4th step It ion water washing 3 times, is dried under the conditions of 100 DEG C, obtains precursor powder;5th step, by precursor powder in N2For 95%, H2 In 5% weakly reducing atmosphere, to be warming up under conditions of temperature is 850 natural cooling after calcining 2h, phosphoric acid zinc-magnesium list matrix is obtained White emitting fluorescent powder, wherein the rate of heating is 5 DEG C/min.
Embodiment 8: the phosphoric acid zinc-magnesium single-substrate white fluorescent powder is prepared by the following method: the first step, by institute 2.6412g Mg(NO3)2·6H2O(AR), 5.9498g Zn (NO3)2·6H2O(AR), 0.1737g Ce (NO3)3·6H2O (AR), 0.0036g Dy (NO3)3·6H2O(AR it) is dissolved in 200ml deionized water and obtains the first solution;Second step, will 2.6412g (NH4)2HPO4(AR) it is dissolved in deionized water and obtains the second solution;Second solution is added dropwise to by third step dropwise It is uniformly mixed and stirs in one solution, obtain sediment, wherein the second solution is added dropwise to mixing in the first solution dropwise Rate is 600r/min;Sediment is stood 5 hours, after filtering under conditions of pressure is 0.05MPa, uses nothing by the 4th step It ion water washing 3 times, is dried under the conditions of 100 DEG C, obtains precursor powder;5th step, by precursor powder in N2For 95%, H2 In 5% weakly reducing atmosphere, to be warming up under conditions of temperature is 850 natural cooling after calcining 2h, phosphoric acid zinc-magnesium list matrix is obtained White emitting fluorescent powder, wherein the rate of heating is 5 DEG C/min.
The phosphoric acid zinc-magnesium single-substrate white fluorescent powder obtained according to embodiment 7, chromaticity coordinates are located at (0.2647,0.2739), Bright white light is issued under ultraviolet excitation.
The phosphoric acid zinc-magnesium single-substrate white fluorescent powder obtained according to embodiment 8, chromaticity coordinates are located at (0.2754,0.3150), Bright white light is issued under ultraviolet excitation.
Fig. 1 is the XRD diagram and MgZn of phosphoric acid zinc-magnesium single-substrate white fluorescent powder of the present invention2(PO4)2Standard card JCPDS NO.83-1203.Fig. 1 it is found that the XRD diffraction maximum of all phosphoric acid zinc-magnesium single-substrate white fluorescent powders and MgZn2 (PO4)2Standard card match, illustrate Ce3+、Dy3+A small amount of doping of ion does not cause the appearance of impurity phase.
Fig. 2 is the exciting light spectrogram and launching light spectrogram of phosphoric acid zinc-magnesium single-substrate white fluorescent powder of the present invention, wherein the left side Curve is exciting light spectrogram, and the right curve is launching light spectrogram.Fig. 2 it is found that under 285 nm excitation wavelengths, emission spectrum by 345 nm, 483 nm, the 575 emission peak positions nm tri- composition.Transmitting peak position at 345 nm is attributable to Ce3+The 5d-4f of ion Caused by transition, 483 nm and 575 nm transmitting peak position belong to Dy3+Ion4F9/2 - 6H15/2With4F9/2 - 6H13/2Transition transmitting. Therefore, in codope sample MgZn2(PO4)2: 0.04Ce3+, 0.0008Dy3+Emission spectrum in not only have Dy3+Ion4F9/2 - 6H15/2/6H13/2Transition characteristics emission peak, exists simultaneously Ce3+Ion2D3/2 - 2F7/2Characteristic transition emission peak.Ce3+ The energy transmission of absorption is given to Dy3+ ion, to effectively improve Dy3+Luminous intensity so that MgZn2(PO4)2: Ce3+ , Dy3+Material issues bright white light.
Fig. 3 is the CIE coordinate diagram of phosphoric acid zinc-magnesium single-substrate white fluorescent powder of the present invention.Fig. 3 can be seen that chromaticity coordinates and be located at (0.2754,0.3150) issues bright white light under ultraviolet excitation.
In conclusion the present invention for the first time using phosphoric acid zinc-magnesium as matrix, adulterates Ce3+And Dy3+, phosphoric acid zinc-magnesium list base obtained Matter white emitting fluorescent powder chemical property is stablized, low raw-material cost, while using coprecipitation, during the preparation process calcination temperature Low, production process is safe and environment-friendly, energy saving, simple process, and material dopant profiles are uniform in obtained product, and brightness is high.
The above technical features constitute embodiments of the present invention, can basis with stronger adaptability and implementation result Actual needs increases and decreases non-essential technical characteristic, to meet the needs of different situations.

Claims (7)

1. a kind of phosphoric acid zinc-magnesium single-substrate white fluorescent powder, it is characterised in that chemical constitution formula MgZn2(PO4)2: aCe3+, bDy3+, wherein a is that 0.02 to 0.08, b is 0.0004 to 0.004, and a, b are molar fraction.
2. phosphoric acid zinc-magnesium single-substrate white fluorescent powder according to claim 1, it is characterised in that prepare by the following method It obtains: the first step, according to stoichiometric ratio by the desired amount of Mg (NO3)2·6H2O、Zn(NO3)2·6H2O、Ce(NO3)3· 6H2O、Dy(NO3)3·6H2O is dissolved in deionized water and obtains the first solution;Second step, by the desired amount of (NH4)2HPO4It is dissolved in Deionized water obtains the second solution;Second solution is added dropwise to dropwise and is uniformly mixed and stirs in the first solution, obtains by third step Sediment;Sediment is stood 3 hours to 8 hours, filtered under conditions of pressure is 0.05MPa to 0.08MPa by the 4th step Afterwards, it is washed 3 times to 5 times using deionized water, is dried under the conditions of 100 DEG C to 120 DEG C, obtain precursor powder;5th step, will Precursor powder is in N2For 95%, H2It is calcined in 5% weakly reducing atmosphere, to be warming up under conditions of temperature is 700 DEG C to 900 DEG C Natural cooling after 1h to 3 h obtains phosphoric acid zinc-magnesium single-substrate white fluorescent powder.
3. phosphoric acid zinc-magnesium single-substrate white fluorescent powder according to claim 2, it is characterised in that in third step, the second solution Being added dropwise to the rate being mixed in the first solution dropwise is 500r/min to 600r/min.
4. phosphoric acid zinc-magnesium single-substrate white fluorescent powder according to claim 2 or 3, it is characterised in that precursor powder is in N2 For 95%, H2For in 5% weakly reducing atmosphere, the rate of heating is 5 DEG C/min to 10 DEG C/min.
5. a kind of preparation method of phosphoric acid zinc-magnesium single-substrate white fluorescent powder according to claim 1, it is characterised in that press It prepares and carries out according to following methods: the first step, according to stoichiometric ratio by the desired amount of Mg (NO3)2·6H2O、Zn(NO3)2· 6H2O、Ce(NO3)3·6H2O、Dy(NO3)3·6H2O is dissolved in deionized water and obtains the first solution;Second step, will be the desired amount of (NH4)2HPO4It is dissolved in deionized water and obtains the second solution;Second solution is added dropwise in the first solution dropwise and mixes by third step It uniformly and stirs, obtains sediment;4th step, by sediment stand 3 hours to 8 hours, pressure be 0.05MPa extremely After being filtered under conditions of 0.08MPa, is washed 3 times to 5 times using deionized water, dry, obtain under the conditions of 100 DEG C to 120 DEG C Precursor powder;5th step, by precursor powder in N2For 95%, H2It is 700 DEG C in 5% weakly reducing atmosphere, to be warming up to temperature Natural cooling after calcining 1h to 3 h, obtains phosphoric acid zinc-magnesium single-substrate white fluorescent powder under conditions of to 900 DEG C.
6. the preparation method of phosphoric acid zinc-magnesium single-substrate white fluorescent powder according to claim 5, it is characterised in that third step In, it is 500r/min to 600r/min that the second solution is added dropwise to the rate being mixed in the first solution dropwise.
7. the preparation method of phosphoric acid zinc-magnesium single-substrate white fluorescent powder according to claim 5 or 6, it is characterised in that forerunner Body powder is in N2For 95%, H2For in 5% weakly reducing atmosphere, the rate of heating is 5 DEG C/min to 10 DEG C/min.
CN201910245014.2A 2019-03-28 2019-03-28 Phosphoric acid zinc-magnesium single-substrate white fluorescent powder and preparation method thereof Pending CN109777419A (en)

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Application publication date: 20190521