CN101659866A - Fluorescent material with adjustable luminescent color - Google Patents
Fluorescent material with adjustable luminescent color Download PDFInfo
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- CN101659866A CN101659866A CN200910067521A CN200910067521A CN101659866A CN 101659866 A CN101659866 A CN 101659866A CN 200910067521 A CN200910067521 A CN 200910067521A CN 200910067521 A CN200910067521 A CN 200910067521A CN 101659866 A CN101659866 A CN 101659866A
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Abstract
The invention provides a fluorescent material with adjustable luminescent color and a method for preparing same. The general chemical formula of the fluorescent material is Sr<2-x>Eu<x>MyCeO<4+(x+y)/2>, wherein M is Li, Na or K, x is not less than 0.00001 and is not less than 0.6 and y is not less than 0.0001 and is not more than 0.9. The activating region is ranging from 220nm to 380nm; and by changing the contents of europium ion and the alkali metal ion used as a coactivator in the material, the adjustable color of the luminescent color from blue to white, orange and red can be realized. The luminescent color of the fluorescent material can be gradually changed from blue to white, orange and red by the following three methods of: (1) fixing the doping amount of the alkali metal and gradually increasing the doping amount of the europium ion; (2) fixing the doping amount of the europium and gradually increasing the doping amount of the alkali metal ion; and (3) simultaneously increasing the doping amount of the alkali metal ion and the europium iron.
Description
Technical field
The invention provides a kind of fluorescent material with adjustable luminescent color.
Background technology
Luminescent material claims twinkler again, be a kind of can be the various forms of energy transformation that absorb from the external world functional materials of nonequilibrium radiation.Luminescent material is used in the every field of human society widely.This had benefited from since nearly half a century, the human a series of achievements in research that obtain in numerous scientific domains such as Condensed Matter Physics, molecular spectrum, coordination chemistry, inorganic functional material and solid state chemistry.
So-called luminescence phenomenon, its essence is a kind of energy transformation form, luminophore is by the energy excitation of certain form-promptly absorb the energy of certain form, and is translated into electromagnetic radiation.When the wavelength of electromagnetic radiation is in visibility region, can observe with the naked eye luminescence phenomenon. the application of solid luminescence mainly contains: the detection of light source, demonstration, video picture, optoelectronics device, radiation field and the record of radiation dose etc.
General inoganic solids luminescent material mainly is made up of matrix and activator, adds some fusing assistants, coactivator and sensitizing agent in addition.Matrix is the main body of luminescent material, it both can be used as foreign ions such as activator the dispersion matrix was provided, can pass to activator with sensitizing agent etc. direct absorbing radiation energy that works again, simultaneously can also directly have influence on the type and the color of luminescent spectrum by the constraint of self crystal field to foreign ions such as activator.Activator plays activation to matrix, and forms luminescence center.The effect of fusing assistant is activator more easily to be diffused into form luminescence center in the parent lattice.
High-temperature solid phase reaction method is a kind of traditional synthetic method, and using synthetic its advantage of product of the present invention of high temperature solid-state method is that crystal growth is superior in quality, few surface defects, and loose being easy to of product pulverized, and can not influence its luminescent properties after pulverizing.
About the indigo plant that can effectively be excited by ultraviolet ray, green and red fluorescence material are the important directions that people study always.Lin Jun group
[1]Once reported a kind of similar fluorescent material with adjustable luminescent color LaGaO
3: xTb
3+, Tb wherein
3+The ionic doping is La
3+The mol number of ionic 0.01-12%, it is a fluorescent material with adjustable in a kind of glow color can be realized from the blueness to the green fields.This fluorescent material is by changing ultraviolet excitation wavelength and Tb
3+The ionic doping realizes that glow color is adjustable.Its shortcoming is that the glow color variable range is narrow and need to change the wavelength of excitation light source.The present invention can use the UV-light of any one fixed wave length between 220-380nm to excite, and need not to change excitation wavelength; Glow color variable range of the present invention is wide.
(reference: [1] Xiaoming Liu, Ran Pang, Zewei Quan, Jun Yang, and Jun Lin.Tunable Luminescence Properties of Tb3+-Doped LaGaO3 NanocrystallinePhosphors.Journal of The Electrochemical Society, 154 (7), J185-J189 (2007) .)
Summary of the invention
The invention provides a kind of fluorescent material with adjustable luminescent color.
Another object of the present invention provides the preparation method of above-mentioned fluorescent material with adjustable luminescent color.
A kind of fluorescent material with adjustable luminescent color is rare earth ion doped basic metal cerate, and its chemical formula is: Sr
2-xEu
xM
yCeO
4+ (x+y)/2, in the formula, M is an alkali metal cation, 0.00001≤x≤0.6,0.0001≤y≤0.9; Described alkali metal cation is lithium ion (Li
+), sodium ion (Na
+) and potassium ion (K
+) in a kind of;
Described fluorescent material with adjustable luminescent color absorbs energy when being 220-380nm ultraviolet ray excited at wavelength, the content by changing europium ion and utilize alkalimetal ion as coactivator, obtain glow color for blue to white to orange to red; Be specially:
(1) when alkali-metal doping be 0.0001≤y≤0.1, in 0.00001≤x≤0.0001, change the doping of europium ion, obtain glow color and be blue fluorescent material; (2) doping when europium ion is 0.0005≤x≤0.001, changes alkali-metal doping in 0.1≤y≤0.9 scope, obtains the fluorescent material of glow color for white; (3) when the alkali-metal-doped amount be 0.6≤y≤0.9, in 0.005≤x≤0.05 scope, change the doping of europium ion, obtaining glow color is orange fluorescent material; (4) doping when europium ion is 0.08≤x≤0.6, changes alkali-metal doping in 0.0001≤y≤0.9 scope, obtains glow color and is red fluorescent material.
The preparation method of described fluorescent material with adjustable luminescent color is to adopt high temperature solid-state method, preparation according to the following steps:
(1) presses chemical formula Sr
2-xEu
xM
yCeO
4+ (x+y)/2In the mol ratio of atom, with the compound that contains alkali metal cation, contain strontium ion Sr
2+Compound, contain cerium ion Ce
4+Compound with contain europium ion Eu
3+Compound be raw material; Europium ion Eu
3+Doping be cerium ion Ce
4+The mol number of 0.001-60%, alkali metal cation Li
+, Na
+Or K
+Doping be cerium ion Ce
4+The mol number of 0.01-90%, after grinding and mixing, under air atmosphere, calcine, calcining temperature is 900～1250 ℃, calcination time is 10-15 hour;
(2) behind the naturally cooling, after the fluorescent material regrinding that calcining is for the first time obtained mixes, calcine in air atmosphere or protective atmosphere, calcining temperature is 900～1250 ℃, and calcination time is 10-15 hour, obtains fluorescent material with adjustable luminescent color;
The described compound that contains alkali metal cation is a kind of in alkalimetal oxide, alkaline carbonate, alkali metal hydroxide or the base metal nitrate or their composition; Described alkali metal cation is lithium ion (Li
+), sodium ion (Na
+) or potassium ion (K
+) in a kind of;
The described strontium ion Sr that contains
2+Compound be a kind of in oxide compound, oxyhydroxide, nitrate or the carbonate of strontium ion or their composition;
The described europium ion Eu that contains
3+Compound be a kind of in the rare earth oxide, rare-earth oxalate, rare earth carbonate, rare earth nitrate of europium ion or their composition;
The described cerium ion Ce that contains
4+Compound be a kind of in the rare earth oxide, rare-earth oxalate, rare earth carbonate, rare earth nitrate of cerium ion or their composition;
Described protective atmosphere is following a kind of or their combination:
(1) nitrogen atmosphere; (2) argon gas atmosphere.
The adjustable fluorescent material of described glow color can be in the 220-380nm scope ultraviolet ray excited the time absorb energy, by change europium ion in this material content and utilize alkalimetal ion as coactivator, can realize glow color by blueness to white to orange adjustable to redness.(1) when fixed base metal doping amount, along with the amount that adds europium ion increases gradually, the glow color of resulting fluorescent material begins progressively to be changed to redness to orange to white by blueness; (2) when the doping of fixing europium ion, along with the amount that adds alkalimetal ion increases gradually, the glow color of resulting fluorescent material begins progressively to be changed to redness to orange to white by blueness equally; (3) when increasing the doping of basic metal and europium ion simultaneously, the glow color of resulting fluorescent material can progressively be changed to redness to orange to white by blueness equally.And its preparation cost is cheap, and raw material is easy to get, and technology is simple, and operational safety, convenience are pollution-free, can be mass-produced.
Beneficial effect: in the prior art, prepare rare-earth ion activated rare earth silicate, aluminate, gallate etc., calcining temperature is higher, generally at 1200-1400 ℃ or higher, the process of material preparation of the present invention is very simple, and calcining temperature is not high, saved the energy, and raw materials cost is low, and is pollution-free, can produce in batches.
Ultraviolet source between the 220-380nm wavelength region excites down, by change europium ion in this material content and utilize alkalimetal ion as coactivator, the glow color that can realize fluorescent material with adjustable luminescent color involved in the present invention by blueness to white to orange adjustable to redness.(1) when fixed base metal doping amount, along with the amount that adds europium ion increases gradually, the glow color of resulting fluorescent material begins progressively to be changed to redness to orange to white by blueness; (2) when the doping of fixing europium ion, along with the amount that adds alkalimetal ion increases gradually, the glow color of resulting fluorescent material begins progressively to be changed to redness to orange to white by blueness equally; (3) when increasing the doping of basic metal and europium ion simultaneously, the glow color of resulting fluorescent material can progressively be changed to redness to orange to white by blueness equally.
Description of drawings
Fig. 1 is the comparison of the X ray diffracting spectrum and the standard card PDF#50-0115 (strontium cerate) of fluorescent material with adjustable luminescent color.Among Fig. 11 is meant the X ray diffracting spectrum of the fluorescent material with adjustable luminescent color that the present invention prepares; Among Fig. 22 is meant the X ray diffracting spectrum of the standard card PDF#50-0115 of strontium cerate.
Fig. 2 is the exciting light spectrogram (monitoring emission light 613nm) of fluorescent material with adjustable luminescent color.
Fig. 3 is fluorescent material with adjustable luminescent color Sr
2-xEu
xM
yCeO
4+ (x+y)/2Emmission spectrum figure (ultraviolet 365nm excites) during different the composition.Among Fig. 3, a-1 represents the emmission spectrum of the prepared fluorescent material of embodiment 1-12 respectively.
Embodiment
Embodiment 1:
Take by weighing Quilonum Retard Li
2CO
3: 0.3700 gram, Strontium carbonate powder SrCO
3: 29.5999 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0002 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1000 ℃, calcination time 10 hours naturally cools to room temperature then, takes out sample.
Mixed grinding is even once more with the raw material after the calcining for the first time, and among air atmosphere, at 950 ℃ of following sintering for the second time, sintering time 12 hours naturally cools to room temperature, obtains a kind of fluorescent material.Referring to accompanying drawing 3, luminescent spectrum is the fluorescent material of a among Fig. 3 to obtain to excite down at UV-light 365nm by the technical scheme of embodiment 1.
Referring to accompanying drawing 1, Fig. 1 is that the XRD test result shows that prepared material is the strontium cerate monophase materials by the X-ray powder diffraction collection of illustrative plates of the material sample of present embodiment technical scheme preparation and the comparison of standard card PDF#50-0115 (strontium cerate).
Referring to accompanying drawing 2, from with the main emission wavelength 613nm of the red fluorescence luminescent material of the present invention preparation as the monitoring wavelength obtain the exciting light spectrogram of ultraviolet region as can be seen, this material excite main ultraviolet (UV) zone between 220-380nm, source.
Embodiment 2:
Take by weighing Quilonum Retard Li
2CO
3: 0.0185 gram, Strontium carbonate powder SrCO
3: 29.5993 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0009 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1050 ℃, calcination time 15 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among nitrogen atmosphere, at 1050 ℃ of following sintering for the second time, sintering time 10 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 2 is the fluorescent material of b among Fig. 3.
Embodiment 3:
Take by weighing Quilonum Retard Li
2CO
3: 0.0004 gram, Strontium carbonate powder SrCO
3: 29.5985 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0018 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1100 ℃, calcination time 12 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among argon gas atmosphere, at 900 ℃ of following sintering for the second time, sintering time 10 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 3 is the fluorescent material of c among Fig. 3.
Embodiment 4:
Take by weighing Quilonum Retard Li
2CO
3: 3.3300 grams, Strontium carbonate powder SrCO
3: 29.5926 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0088 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1250 ℃, calcination time 10 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among oxygen atmosphere, at 1000 ℃ of following sintering for the second time, sintering time 15 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 4 is the fluorescent material of d among Fig. 3.
Embodiment 5:
Take by weighing Quilonum Retard Li
2CO
33: 2.2200 grams, Strontium carbonate powder SrCO
3: 29.5882 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0141 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 950 ℃, calcination time 15 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among air atmosphere, at 1100 ℃ of following sintering for the second time, sintering time 12 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 5 is the fluorescent material of e among Fig. 3.
Embodiment 6:
Take by weighing Quilonum Retard Li
2CO
3: 0.3700 gram, Strontium carbonate powder SrCO
3: 29.5852 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0176 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1000 ℃, calcination time 15 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among nitrogen atmosphere, at 1100 ℃ of following sintering for the second time, sintering time 10 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 6 is the fluorescent material of f among Fig. 3.
Embodiment 7:
Take by weighing Quilonum Retard Li
2CO
3: 3.3300 grams, Strontium carbonate powder SrCO
3: 29.5260 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.0880 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1150 ℃, calcination time 10 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among argon gas atmosphere, at 1150 ℃ of following sintering for the second time, sintering time 10 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 7 is the fluorescent material of g among Fig. 3.
Embodiment 8:
Weighing sodium carbonate Quilonum Retard Li
2CO
3: 2.9600 grams, Strontium carbonate powder SrCO
3: 29.1560 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.5279 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1250 ℃, calcination time 10 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among argon gas atmosphere, at 900 ℃ of following sintering for the second time, sintering time 12 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 8 is the fluorescent material of h among Fig. 3.
Embodiment 9:
Take by weighing Quilonum Retard Li
2CO
3: 2.2200 grams, Strontium carbonate powder SrCO
3: 28.8600 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 0.8798 gram, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1050 ℃, calcination time 15 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among nitrogen atmosphere, at 1050 ℃ of following sintering for the second time, sintering time 15 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 9 is the fluorescent material of i among Fig. 3.
Embodiment 10:
Take by weighing Quilonum Retard Li
2CO
3: 3.3300 grams, Strontium carbonate powder SrCO
3: 28.4160 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 1.4077 grams, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1100 ℃, calcination time 12 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among air atmosphere, at 1200 ℃ of following sintering for the second time, sintering time 10 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 10 is the fluorescent material of j among Fig. 3.
Embodiment 11:
Take by weighing Quilonum Retard Li
2CO
3: 2.2200 grams, Strontium carbonate powder SrCO
3: 28.1200 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 1.7597 grams, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 1150 ℃, calcination time 10 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and at nitrogen atmosphere, at 1000 ℃ of following sintering for the second time, sintering time 15 hours naturally cools to room temperature, obtains a kind of fluorescent material.Technical scheme acquisition luminescent spectrum under UV-light 365nm excites by embodiment 11 is the fluorescent material of k among Fig. 3.
Embodiment 12:
Take by weighing Quilonum Retard Li
2CO
3: 0.0004 gram, Strontium carbonate powder SrCO
3: 20.7200 grams, cerium oxide CeO
2: 17.2120 grams, europium sesquioxide Eu
2O
3: 10.5579 grams, after grinding and mixing, to select to calcine for the first time among the air atmosphere, temperature is 900 ℃, calcination time 15 hours naturally cools to room temperature then, takes out sample.Mixed grinding is even once more with the raw material after the calcining for the first time, and among argon gas atmosphere, at 1250 ℃ of following sintering for the second time, sintering time 10 hours naturally cools to room temperature, obtains a kind of fluorescent material.Obtain to excite luminescent spectrum down to be 1 fluorescent material among Fig. 3 by the technical scheme of embodiment 12 at UV-light 365nm.
Claims (3)
1, a kind of fluorescent material with adjustable luminescent color is characterized in that, it is a kind of rare earth ion doped basic metal cerate, and its chemical formula is: Sr
2-xEu
xM
yCeO
4+ (x+y)/2, in the formula, M is an alkali metal cation, 0.00001≤x≤0.6,0.0001≤y≤0.9; Described alkali metal cation is Li
+, Na
+And K
+In a kind of; Absorb energy when being 220-380nm ultraviolet ray excited at wavelength, the content by changing europium ion and utilize alkalimetal ion, described glow color is adjustable fluorescent material realizes glow color as coactivator by blueness to white to orange to redness;
2, a kind of fluorescent material with adjustable luminescent color as claimed in claim 1 is characterized in that, described fluorescent material is the fluorescent material of following glow color:
(1) when alkali-metal doping be 0.0001≤y≤0.1, in 0.00001≤x≤0.0001, change the doping of europium ion, obtain glow color and be blue fluorescent material; (2) doping when europium ion is 0.0005≤x≤0.001, changes alkali-metal doping in 0.1≤y≤0.9 scope, obtains the fluorescent material of glow color for white; (3) when the alkali-metal-doped amount be 0.6≤y≤0.9, in 0.005≤x≤0.05 scope, change the doping of europium ion, obtaining glow color is orange fluorescent material; (4) doping when europium ion is 0.08≤x≤0.6, changes alkali-metal doping in 0.0001≤y≤0.9 scope, obtains glow color and is red fluorescent material.
3, the preparation method of a kind of fluorescent material with adjustable luminescent color shown in claim 1, it is characterized in that step and condition are as follows: (1) presses chemical formula Sr
2-xEu
xM
yCeO
4+ (x+y)/2In the mol ratio of atom, with the compound that contains alkali metal cation, contain strontium ion Sr
2+Compound, contain cerium ion Ce
4+Compound with contain europium ion Eu
3+Compound be raw material; Europium ion Eu
3+Doping be cerium ion Ce
4+The mol number of 0.001-60%, the doping of alkali metal cation is cerium ion Ce
4+The mol number of 0.01-90%, after grinding and mixing, under air atmosphere, calcine, calcining temperature is 900～1250 ℃, calcination time is 10-15 hour;
(2) behind the naturally cooling, after the fluorescent material regrinding that calcining is for the first time obtained mixes, calcine in air atmosphere or protective atmosphere, calcining temperature is 900～1250 ℃, calcination time is 10-15 hour, obtains a kind of fluorescent material with adjustable luminescent color;
The described compound that contains alkali metal cation is a kind of in alkalimetal oxide, alkaline carbonate, alkali metal hydroxide and the base metal nitrate or their composition; Described alkali metal cation is Li
+, Na
+And K
+In a kind of;
The described strontium ion Sr that contains
2+Compound be a kind of in oxide compound, oxyhydroxide, nitrate and the carbonate of strontium ion or their composition;
The described europium ion Eu that contains
3+Compound be a kind of in the rare earth oxide, rare-earth oxalate, rare earth carbonate, rare earth nitrate of europium ion or their composition;
The described cerium ion Ce that contains
4+Compound be a kind of in the rare earth oxide, rare-earth oxalate, rare earth carbonate, rare earth nitrate of cerium ion or their composition;
Described protective atmosphere is a kind of in the following atmosphere or their combination: (1) nitrogen atmosphere; (2) argon gas atmosphere.
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|---|---|---|---|---|
| CN117327490A (en) * | 2023-09-28 | 2024-01-02 | 昆明理工大学 | Bi-doped europium salt fluorescent powder and preparation method and application thereof |
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|---|---|---|---|---|
| CN117327490A (en) * | 2023-09-28 | 2024-01-02 | 昆明理工大学 | Bi-doped europium salt fluorescent powder and preparation method and application thereof |
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