Patent Application
20150284630
The present invention relates to luminescent material technology. More particularly, the invention relates to an aluminate luminescent material and preparation method thereof.
In the 1960s, Ken Shoulder proposed ideas based on field emissive arrays (Field Emissive Arrays, FEAs) electron beam microelectronic devices, thus, to design and produce panel display and light resource devices (Field Emission Display, FED) by using FEAs has drawn the public's attention. Similar to the working principle of conventional cathode ray tube (Cathode Ray Tube, CRT), such new field emission display lights and forms images by electron beam bombardment on red, green blue trichromatic fluorescent powder. Field emission display has potential advantages in luminance, visual angle, response time, working temperature range, energy consumption and other aspects.
A key factor to prepare field emission display of high performances is to prepare luminescent material of excellent performance. At present, luminescent material provided in field emission display are commonly luminescent material of traditional cathode ray tube and projection television kinescope, such as sulfide series, and oxysulfide series luminescent material. As for sulfide series and oxysulfide series luminescent material, they have high luminance and electrical conductivity, but, under the large electron beam bombardment, they prone to decompose into elemental sulfur, which can poison the tip of cathode and produce other precipitates covering the luminescent material, so as to reduce the luminescent efficiency of luminescent material, and shorten the life of a field emission display.
In view of this, the present invention provides an aluminate luminescent material and preparation method therefor, said aluminate luminescent material has high luminescent intensity and good stability.
An aluminate luminescent material, said aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, Ln is selected from at least one of Ce and Tb, M is selected from at least one of Ag, Au, Pt, Pd, and Cu metal nanoparticles, x is in a range of 0<x≦0.05, y is a molar ratio of M to Al and y is in a range of 0<y≦1×10−2.
In one embodiment of the present invention, x is in a range of 0.01≦x≦0.3.
In one embodiment of the present invention, y is in a range of 1×10−5≦y≦5×10−3.
A method for preparing an aluminate luminescent material, comprising:
dissolving aluminium oxide aerogel in ethanol solution containing M, stirring and sonicating mixture of aluminium oxide aerogel and ethanol solution containing M, then drying, and grinding solid material obtained from drying, calcining said solid material at 600° C. to 1200° C. for 0.5 to 4 hours to obtain aluminium oxide aerogel containing M, wherein the M is selected from at least one of Ag, Au, Pt, Pd, and Cu nanoparticles;
selecting source compound of Y, source compound of Ln and said aluminium oxide aerogel containing M according to stoichiometric ratios of corresponding elements in general molecular formula of Y3-xAl5O12:Lnx,My, mixing and grinding uniformly to form mixture material, calcining said mixture material under reducing atmosphere at 1300° C. to 1700° C. for 2 to 8 hours, cooling and grinding to obtain aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, wherein Ln is selected from at least one of Ce and Tb, x is in a range of 0<x≦0.05, y is a molar ratio of M to Al and y is in a range of 0<y≦1×10−2.
In one embodiment of the present invention, a concentration of said M in said ethanol solution containing M is in a range of 5×10−6 mol/L to 1×10−2 mol/L.
In one embodiment of the present invention, said stirring is processed at 50° C. to 75° C. for 0.5 to 3 hours.
In one embodiment of the present invention, said sonicating is processed for 5˜20 minutes.
In one embodiment of the present invention, said drying is processed at 60° C. to 150° C.
In one embodiment of the present invention, said source compound of Y is one of yttrium oxide, yttrium nitrate, yttrium carbonate, yttrium chloride and yttrium oxalate, said source compound of Ln is one of lanthanide oxide, lanthanide nitrate, lanthanide carbonate, lanthanide chloride and lanthanide oxalate.
In one embodiment of the present invention, said reducing atmosphere is selected from at least one of mixed gases of N2 and H2 reducing atmosphere, C powder reducing atmosphere, CO reducing atmosphere, and H2 reducing atmosphere.
The aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, formed by codoping Ln and M in a Y3Al5O12 substrate, of which metal nanoparticles M can improve internal quantum efficiency of the luminescent material, thereby improving luminescent intensity of the aluminate luminescent material. In addition, Y3Al5O12 used as substrate is stable so that the aluminate luminescent material has high stability, which can prevent a phenomenon where luminescent efficiency of the luminescent material is reduced because a traditional sulfide and sulfur oxide decompose during use and sediment generated in decomposition covers a surface of the luminescent material.
Further description of the aluminate luminescent material and preparation method therefor will be illustrated combined with embodiments and drawings.
In one embodiment of the present invention, aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My.
Wherein, Ln is selected from at least one of Ce and Tb.
M is selected from at least one of Ag, Au, Pt, Pd, and Cu metal nanoparticles.
X is in a range of 0<x≦0.05, preferably, x is in a range of 0.01≦x≦0.3.
Y is a molar ratio of M to Al and y is in a range of 0<y≦1×10−2, preferably, y is in a range of 1×10−5≦y≦5×10−3.
“:” refers to doping, the aluminate luminescent material is formed by codoping rare earth element Ln and metal nanoparticles M in a Y3Al5O12 substrate.
Y3Al5O12 is an aluminate with perovskite structure, and is an excellent laser and scintillator matrix. Y3-xAl5O12:Lnx is formed by using Y3Al5O12 as luminescent substrate, and doping rare earth element Ln as emission center which partially replace Y. Trivalent Ln3+ ions are used as active ion of aluminate luminescent material. Trivalent Ce3+ and Tb3+ ions have similar ionic radius as that of trivalent Y3+ ions, so there can be doped into Y3Al5O12 easely and replace Y3+ ions thus to activate luminescent substrate to illuminate light.
Metal nanoparticles M is used for improve internal quantum efficiency of the aluminate luminescent material, thereby improving luminescent intensity.
The aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, formed by codoping rare earth element Ln and metal nanoparticles M in a Y3Al5O12 substrate, wherein M can induce surface plasmon resonance effect performance thus to improve internal quantum efficiency of the luminescent material, thereby improving luminescent intensity of aluminate luminescent material.
In addition, Y3Al5O12 has good thermal conductivity, mechanical strength, and relatively stable chemical properties. With using Y3Al5O12 as substrate, the aluminate luminescent material has high stability, which can prevent a phenomenon where luminescent efficiency of the luminescent material is reduced because a traditional sulfide and sulfur oxide decompose during use and sediment generated in decomposition covers a surface of the luminescent material.
Said aluminate luminescent material is formed by doping metal nanoparticles M in a Y3Al5O12Y3-xAl5O12:Lnx, while the doping of metal nanoparticles M will no change the luminescent substrate structure, so it keeps the stability of Y3-xAl5O12:Lnx.
Therefore, the use of aluminate luminescent material in field of emission display field, helps improving the luminescent performance and service life of emission display field.
Refers to
Step S110: dissolving aluminium oxide aerogel in ethanol solution containing M, stirring and sonicating mixture of aluminium oxide aerogel and ethanol solution containing M, then drying, and grinding solid material obtained from drying, calcining said solid material at 600° C. to 1200° C. for 0.5 to 4 hours to obtain aluminium oxide aerogel containing M.
M is selected from at least one of Ag, Au, Pt, Pd, and Cu metal nanoparticles.
The ethanol solution containing M is obtained by dissolve metallic compound of M in ethanol, wherein, preferably, the concentration of said M is in a range of 5×10−6 mol/L to 1×10−2 mol/L.
The molar ratio of M to aluminium oxide aerogel is expressed as z, and z is in a range of 0≦z≦5×10−3.
Dissolving aluminium oxide (Al2O3) aerogel in ethanol solution containing M, and then stirring to have aluminium oxide aerogel fully dissolved. Preferably, stirring is processed at 50° C. to 75° C. for 0.5 to 3 hours.
After stirring, sonicating to have M fully and uniformed adsorbed in aluminium oxide aerogel. Preferably, sonicating is processed for 10 minutes.
And then process drying at 60° C. to 150° C., and grinding solid material obtained from drying, calcining said solid material at 600° C. to 1200° C. for 0.5 to 4 hours to remove crystal water, and thus obtaining aluminium oxide aerogel containing M.
Step S120: selecting source compound of Y, source compound of Ln and aluminium oxide aerogel containing M according to stoichiometric ratios of corresponding elements in general molecular formula of Y3-xAl5O12:Lnx,My, mixing and grinding uniformly to form mixture material, calcining the mixture material under reducing atmosphere at 1300° C. to 1700° C. for 2 to 8 hours, cooling and grinding to obtain aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, wherein Ln is selected from at least one of Ce and Tb, x is in a range of 0<x≦0.05, y is a molar ratio of M to Al and y is in a range of 0<y≦1×10−2.
Source compound of Y is one of yttrium oxide, yttrium nitrate, yttrium carbonate, yttrium chloride and yttrium oxalate.
Such as, source compound of Y is one of Y2O3, Y(NO3)3.6H2O, Y2(CO3)3, YCl3, Y2(C2O4)3.10H2O.
Source compound of Ln is one of lanthanide oxide, lanthanide nitrate, lanthanide carbonate, lanthanide chloride and lanthanide oxalate.
Such as, source compound of Ln is one of Tb4O7, Ce(NO3)3.6H2O, Tb(NO3)3.6H2O, Ce2(CO3)3, Ce2(C2O4)3, TbCl3.
Reducing atmosphere is selected from at least one of a mixed reducing atmosphere of a volume ratio of 95% N2 and a volume ratio of 5% Hz, C powder reducing atmosphere, CO reducing atmosphere, and H2 reducing atmosphere.
Cooling to room temperature, and further grinding to obtain aluminate luminescent material with small particles size and uniformed distribution. The aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, wherein Ln is selected from at least one of Ce and Tb, M is selected from at least one of Ag, Au, Pt, Pd, and Cu metal nanoparticles, x is in a range of 0<x≦0.05, y is a molar ratio of M to Al and y is in a range of 0<y≦1×10−2.
Said preparation method of the aluminate luminescent material comprises: adsorbing metal nanoparticles M by aluminium oxide aerogel to obtain aluminium oxide aerogel containing metal nanoparticles, and then using it as starting material to prepare aluminate luminescent material by high-temperature solid-phase method. The aluminate luminescent material has a general molecular formula of Y3-xAl5O12:Lnx,My, which is formed by codoping rare earth element Ln and metal nanoparticles M in a Y3Al5O12 substrate. The aluminate luminescent material obtained by said preparation method has the advantage of high purity.
Said preparation methods of aluminate luminescent material are of simple process, low demand on equipment, no pollution, easy to control, easy to produce in industry. The aluminate luminescent material prepared from this method has high luminescent intensity and good stability.
Special embodiments are disclosed as follows.
(1) Preparation of Al2O3 Aerogel Containing Pt.
Weighing 0.6117 g of Al2O3 aerogel, dissolving it in 12 ml of ethanol solution containing H2PtCl6.6H2O where the concentrate of H2PtCl6.6H2O is 5×10−3 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing H2PtCl6.6H2O at 50° C. for 3 h, and sonicating the mixture for 10 minutes, then drying at 60° C. Grinding solid material obtained from drying, calcining said solid material at 600° C. for 4 hours to obtain Al2O3 aerogel containing Pt.
(2) Preparation of Y2.99Al5O12:Ce0.01,Pt5×10
Weighing 1.0698 g of Y2(CO3)3, 0.0046 g of Ce2(CO3)3 and 0.5098 g of Al2O3 aerogel containing Pt4+, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, calcining the mixture material powder in tube furnace under a mixed reducing atmosphere of a volume ratio of 95% N2 and a volume ratio of 5% H2 at 1700° C. for 2 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Pt has a molecular formula of Y2.99Al5O12:Ce0.01,Pt5×10
(1) Preparation of Al2O3 Aerogel Containing Ag.
Weighing 0.6117 g of Al2O3 aerogel, dissolving it in 15 ml of ethanol solution containing AgNO3 where the concentrate of AgNO3 is 2×10−4 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing AgNO3 at 60° C. for 2 h, and sonicating the mixture for 10 minutes, then drying at 80° C. Grinding solid material obtained from drying, calcining said solid material at 800° C. for 2 hours to obtain Al2O3 aerogel containing Ag.
(2) Preparation of Y2.88Al5O12:Tb0.12, Ag2.5×10
Weighing 0.6503 g of Y2O3, 0.0448 g of Tb4O7 and 0.5098 g of Al2O3 aerogel containing Ag+, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, calcining the mixture material powder in muffle furnace under C powder reducing atmosphere at 1500° C. for 4 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Ag has a molecular formula of Y2.88Al5O12:Tb0.12, Ag2.5×10
As shown from
(1) Preparation of Al2O3 Aerogel Containing Au.
Weighing 0.6117 g of Al2O3 aerogel, dissolving it in 12 ml of ethanol solution containing HAuCl4 where the concentrate of HAuCl4 is 1×10−2 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing HAuCl4 at 75° C. for 0.5 h, and sonicating the mixture for 20 minutes, then drying at 150° C. Grinding solid material obtained from drying, calcining said solid material at 1200° C. for 0.5 hours to obtain Al2O3 aerogel containing Au.
(2) Preparation of Y2.5Al5O12:Tb0.50, Au1×10
Weighing 0.5645 g of Y2O3, 0.1868 g of Tb4O2 and 0.5098 g of Al2O3 aerogel containing Au3+, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, calcining the mixture material powder in tube furnace under a mixed reducing atmosphere of a volume ratio of 95% N2 and a volume ratio of 5% H2 at 1450° C. for 6 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Au has a molecular formula of Y2.5Al5O12:Tb0.50, Au1×10
(1) Preparation of Al2O3 Aerogel Containing Pd.
Weighing 0.3058 g of Al2O3 aerogel, dissolving it in 15 ml of ethanol solution containing PdCl2.2H2O where the concentrate of PdCl2.2H2O is 1×10−4 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing PdCl2.2H2O at 65° C. for 1.5 h, and sonicating the mixture for 15 minutes, then drying at 120° C. Grinding solid material obtained from drying, calcining said solid material at 1100° C. for 2 hours to obtain Al2O3 aerogel containing Pd.
(2) Preparation of Y2.7Al5O12:Ce0.10, Tb0.20, Pd4×10
Weighing 1.4844 g of Y(NO3)3.6H2O, 0.0652 g of Ce(NO3)3.6H2O, 0.1379 g of Tb(NO3)3.6H2O and 0.5098 g of Al2O3 aerogel containing Pd, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, calcining the mixture material powder in tube furnace under a mixed reducing atmosphere of a volume ratio of 95% N2 and a volume ratio of 5% H2 at 1400° C. for 4 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Pd has a molecular formula of Y2.7Al5O12:Ce0.10, Tb0.20, Pd4×10
(1) Preparation of Al2O3 Aerogel Containing Ag+.
Weighing 0.6117 g of Al2O3 aerogel, dissolving it in 24 ml of ethanol solution containing AgNO3 where the concentrate of AgNO3 is 5×10−6 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing AgNO3 at 65° C. for 1.5 h, and sonicating the mixture for 5 minutes, then drying at 120° C. Grinding solid material obtained from drying, calcining said solid material at 900° C. for 3 hours to obtain Al2O3 aerogel containing Ag+.
(2) Preparation of Y2.88Al5O12:Ce0.12, Ag1×10
Weighing 1.2723 g of Y2 (C2O4)3.10H2O, 0.0653 g of Ce(C2O4)3 and 0.5098 g of Al2O3 aerogel containing Ag, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, calcining the mixture material powder in tube furnace under CO reducing atmosphere at 1300° C. for 8 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Ag+. has a molecular formula of Y2.88Al5O12:Ce0.12, Ag1×10
(1) Preparation of Al2O3 Aerogel Containing Cu.
Weighing 0.6117 g of Al2O3 aerogel, dissolving it in 12 ml of ethanol solution containing Cu(NO3)2 where the concentrate of Cu(NO3)2 is 5×10−4 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing Cu(NO3)2 at 70° C. for 1 h, and sonicating the mixture for 10 minutes, then drying at 70° C. Grinding solid material obtained from drying, calcining said solid material at 800° C. for 2 hours to obtain Al2O3 aerogel containing Cu.
(2) Preparation of Y2.70Al5O12:Tb0.30, Cu5×10
Weighing 1.0544 g of YCl3, 0.1591 g of TbCl3 and 0.5098 g of Al2O3 aerogel containing Cu, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, heating the mixture material powder in muffle furnace at 1600° C. for 3 hours and then calcining the mixture material powder in tube furnace under a mixed reducing atmosphere of a volume ratio of 95% N2 and a volume ratio of 5% H2 at 1400° C. for 2 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Cu has a molecular formula of Y2.70Al5O12:Tb0.30, Cu5×10
(1) Preparation of Al2O3 Aerogel Containing Ag and Au.
Weighing 0.6117 g of Al2O3 aerogel, dissolving it in 15 ml of ethanol solution containing AgNO3 and HAuCl4 where the concentrate of AgNO3 is 1×10−3 mol/L and the concentrate of HAuCl4 is 1×10−3 mol/L. Stirring the mixture of Al2O3 aerogel and ethanol solution containing AgNO3 and HAuCl4 at 60° C. for 2 h, and sonicating the mixture for 10 minutes, then drying at 80° C. Grinding solid material obtained from drying, calcining said solid material at 1000° C. for 4 hours to obtain Al2O3 aerogel containing Ag and Au.
(2) Preparation of Y2.90Al5O12:Ce0.10,(Ag0.5/Au0.5)1.25×10
Weighing 1.5944 g of Y(NO3)3.6H2O and Ce(NO3)3.6H2O and 0.5098 g of Al2O3 aerogel containing Ag and Au, grinding uniformly in agate mortar to form mixture material powder, then placing the mixture material powder into corundum crucible, calcining the mixture material powder under C powder and CO reducing atmosphere at 1500° C. for 3 hours, cooling to room temperature, and grinding to obtain aluminate luminescent material containing Ag and Au has a molecular formula of Y2.90Al5O12:Ce0.10,(Ag0.5/Au0.5)1.25×10
While the present invention has been described with reference to particular embodiments, it will be understood that the embodiments are illustrative and that the invention scope is not so limited. Alternative embodiments of the present invention will become apparent to those having ordinary skill in the art to which the present invention pertains. Such alternate embodiments are considered to be encompassed within the scope of the present invention. Accordingly, the scope of the present invention is described by the appended claims and is supported by the foregoing description.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2012/083875 | 10/31/2012 | WO | 00 |
