Abstract:
Fluorescent materials and preparation methods thereof are provided. The fluorescent materials are represented by the general formula: M, Zn 1-x Al x O and Y 2 O 3 : Re, wherein Re is at least one selected from Eu and Tb, M is at least one selected from Ag, Au, Pt and Pd in the form of nano-particle, and 0&lt;×≦0.05. The said methods include the following steps: step  1 , preparing a colloid of Zn 1-x Al x O; step  2 , preparing a colloid of Y and Re containing the metal element M; step  3 , mixing the colloid of Zn 1-x Al x O with the colloid of Y and Re, aging and heating treatment to form the fluorescent materials. Compared to the Y 2 O 3  fluorescent materials in the art the present fluorescent materials have higher luminescence efficiency, conductivity, long life and industrial applicability.

Description:
FIELD OF THE INVENTION 
     The present disclosure relates to the field of optoelectronics and illumination techniques, and more particularly relates to an yttrium oxide phosphor mixture and preparation method thereof. 
     BACKGROUND OF THE INVENTION 
     With more and more wide development and application of high-quality display illumination devices in work and life, high-efficiency phosphor has become an increasingly important application material. The traditional oxide phosphor exhibits a good stability, however, its luminous efficiency subjected to the low-voltage electron beam is not high enough. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is necessary to provide an yttrium oxide phosphor mixture with high luminous efficiency. 
     In addition, it is necessary to provide a preparation method of the yttrium oxide phosphor mixture with high luminous efficiency. 
     An yttrium oxide phosphor mixture is represented by the chemical formulae:
 
M, Zn 1-x Al x O and Y 2  O 3  : Re;
 
     wherein Re is at least one selected from Eu and Tb, M is at least one selected from the group consisting Ag, Au, Pt and Pd in the form of nano-particle, and 0&lt;x≦0.05. 
     Preferably, the doping concentration of Re in Y 2 O 3  is from 0.1% to 10%; the mole ratio of M to the sum of Re and Y is from 0.00002:1 to 0.01:1; the mole ratio of Zn 1-x Al x O to the sum of Re and Y is from 0.01:1 to 2:1. 
     A preparation method of an yttrium oxide phosphor mixture comprises the following steps: 
     S1, preparing a Zn 1-x Al x O colloid, wherein 0&lt;x≦0.05; 
     S2, preparing a Y, Re colloid containing metal nano-particle M or ion M; wherein Re is at least one selected from Eu and Tb, M is at least one selected from the group consisting Ag, Au, Pt and Pd; and 
     S3, mixing the Zn 1-x Al x O colloid with the Y, Re colloid containing M in water bath with stirring to produce a mixture colloid, aging and heat treating the mixture colloid to obtain the yttrium oxide phosphor mixture. 
     Preferably, the step S1 comprises: weighing raw materials of zinc salt and aluminum salt, respectively; dissolving with a solvent; adding stabilizing agent to prepare a mixed solution having a total mole concentration of zinc ion and aluminum ion of 0.05 to 0.70 mol/L; stirring the mixed solution in a water bath of 40° C. to 70° C. for 4 to 8 hours to obtain a precursor solution of Zn 1-x Al x O; placing the precursor solution of Zn 1-x Al x O in a 60° C. to 90° C. oven and aging for 40 to 60 hours to obtain the Zn 1-x Al x O colloid. 
     The zinc salt is selected from at least one of the group consisting of Zn(CH 3 COO) 2 .2H 2 O, Zn(NO 3 ) 2 .6H 2 O, ZnCl 2 .2H 2 O and ZnSO 4 .7H 2 O; the aluminum salt is selected from at least one of the group consisting of Al(NO 3 ) 3 .9H 2 O, AlCl 3 .6H 2 O and Al 2 (SO 4 ) 3 ; the solvent is selected from at least one of the group consisting of C 3 H 8 O 2  and aqueous ethanol solution; and the volume ratio of ethanol to deionized water of the aqueous ethanol solution is in a range of 3:1 to 7:1; the stabilizing agent is selected from at least one of the group consisting of C 2 H 7 NO, C 4 H 11 NO 2  and C 6 H 15 O 3 N. 
     Preferably, the step S2 comprises: S21, weighing raw materials of Y and Re respectively according to a doping concentration of Re in Y 2 O 3  of 0.1% to 10% to prepare a Y, Re solution having a sum ion concentration of 0.1 mol/L to 2.00 mol/L; wherein the Y, Re solution is a Y, Re aqueous solution or an aqueous ethanol solution; S22, measuring the Y, Re solution, adding ethanol, raw material of M, a complexing agent and a surfactant, successively, to prepare a Y, Re alcohol aqueous solution; wherein the ratio of water to alcohol in the Y, Re alcohol aqueous solution is from 1:1 to 9:1, the sum of mole concentration of Y and Re is 0.1 mol/L to 1.0 mol/L, the mole ratio of the complexing agent to the sum of Y and Re is from 1:1 to 5:1, the concentration of the surfactant is 0.05 mol/L to 0.20 mol/L; wherein deionized water can be added to prepare the Y, Re alcohol aqueous solution; S23, stirring the Y, Re alcohol aqueous solution in a water bath of 40° C. to 60° C. for 4 to 6 hours, and placing the Y, Re alcohol aqueous solution in a 60° C. to 90° C. oven and aging for 56 to 90 hours to obtain the Y, Re colloid containing metal nano-particle M or ion M. 
     Preferably, the raw materials of Y and Re are metal oxides, hydrochloric acid salts, nitrates, or oxalates; the metal oxides are Y 2 O 3 , Eu 2 O 3 , Tb 4 O 7 ; the hydrochloric acid salts are YCl 3 .7H 2 O, EuCl 3 , TbCl 3 .6H 2 O; the nitrates are Y(NO 3 ) 3 .6H 2 O, Eu(NO 3 ) 3 .6H 2 O, Tb(NO 3 ) 3 .6H 2 O; the oxalates are oxalates which can provide Y 3+ , Eu 3 + , and Tb 3+ ; the raw material of M is Ag, Au, Pt and Pd in the form of nano-particle; the raw material of M is aqueous or alcohol solution of AgNO 3 , HAuCl 4 , H 2 PtCl 6 , H 2 PdCl 4 ; the complexing agent is citric acid; the surfactant is selected from at least one of the group consisting of polyethylene glycol 6000, polyethylene glycol 8000, polyethylene glycol 10000 and polyethylene glycol 20000. 
     Preferably, during the preparation of the Y, Re aqueous solution, if the hydrochloric acid salts or the nitrates are used as the raw materials of Y and/or Re, the raw materials of Y and/or Re are dissolved in a vessel directly. If the metal oxides or the oxalates are used as the raw materials of Y and/or Re, the metal oxides or the oxalates corresponding to the Y, Re are dissolved in a vessel with hydrochloric acid or nitric acid under a condition of 15° C. to 100° C. with stirring. 
     Preferably, in step S3, the ratio of the sum of molar amount of Zn and Al to the sum of molar amount of Re and Y in the mixture colloid is in a range of 0.01:1 to 2:1; the temperature of water bath is 15° C. to 80° C., the stirring time is 1 to 4 hours; the aging is placing the mixture colloid in a 100° C. to 200° C. oven for 48 to 96 hours; the heat treating is placing the mixture colloid in a crucible at 800° C. to 1300° C. for 0.5 to 6 hours under an air atmosphere or a reducing atmosphere. The reducing atmosphere are powdered carbon or a mixture of nitride (N 2 ) and hydrogen H 2  where the proportion of hydrogen to nitrogen in the hydrogen-nitrogen atmosphere is 95:5. 
     Preferably, when the Re in the yttrium oxide phosphor contains Terbium, the reducing atmosphere is used; when the Re contains only Europium, the air atmosphere is used. 
     Metal nano-particles are added into the yttrium oxide phosphor doped with a rare earth element, and since the metal nano-particles has large surface area, the internal quantum efficiency of the phosphor is improved due to the surface plasmon coupling effect, thereby improving the luminous efficiency of the phosphor. 
     Meanwhile, the material is oxide phosphor, which has a long work life. By changing the type and ratio of Re, the phosphor can radiate light with different wavelength. The addition of the conductive material of Zn 1-x Al x O leads to further improvement of conductivity of the phosphor, thus enhancing the emission luminance of the phosphor. The conductivity of the phosphor can be further improved by changing the amount of Zn and Al in Zn 1-x Al x O. 
     The preparation method is a simple, low equipment requirement, and has a short preparation period; the method is proved feasible after several practices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a flowchart of an embodiment of a method for preparing an yttrium oxide phosphor mixture; 
         FIG. 2  shows a spectrum of the yttrium oxide phosphor mixture prepared according to the present invention and commercial broadband spectrum phosphor under a cathode ray excitation. 
     
    
    
     DETAILED DESCRIPTION 
     The surface plasmon (SP) is a type of a wave spreading along the interface between metal and dielectric, and the amplitude exponentially decay as the distance away from the interface increases. When the metal surface structure is changed, the nature, dispersion relation, excitation mode, and coupling effects of surface plasmon polaritons (SPPs) will change significantly. The electromagnetic fields caused by the SPPs, not only can restrain the spread of light waves in the subwavelength structure, but also can generate and manipulate the electromagnetic radiation from the light frequency to the microwave band, thus active manipulation of light propagation is achieved, and to increase the optical density of states of the luminescent materials and enhances spontaneous emission rate. In addition, by using the surface plasmon coupling effect, the internal quantum efficiency of the luminescent material can be greatly improved, thus enhancing the emission intensity of the material. 
     Accordingly, when preparing the phosphor, metal nano-particle and conductive material can be added, such that the emission intensity of the phosphor can be enhanced via the surface plasmon coupling effect and excellent conductivity. How to effectively integrate surface plasmon effect and excellent conductive properties in the phosphor has been an important research in the field of materials science, optoelectronics and illumination technology. 
     An yttrium oxide phosphor mixture, which is conductive and integrated with SP effect, is provided. A preparation method of the yttrium oxide phosphor mixture is provided. The phosphor colloidis prepared by sol-gel method, and conductive material and metal nano-particles are added in the phosphor colloid, thus the emission intensity of the phosphor can be enhanced. 
     An yttrium oxide phosphor mixture, which includes Y 2 O 3 , rare earth element Re, metal nano-particle M, and Zn 1-x Al x O, is represented by the chemical formulae:
 
M, Zn 1-x Al x O and Y 2 O 3 :Re;
 
     wherein Re is at least one selected from Eu and Tb, M is at least one selected from the group consisting Ag, Au, Pt and Pd in the form of nano-particle, and 0&lt;x≦0.05. 
     In a preferable embodiment, Re is doped in Y 2 O 3 , and the doping concentration is from 0.1% to 10%. The mole ratio of M to the sum of Re and Y is from 0.00002:1 to 0.01:1. The mole ratio of Zn 1-x Al x O to the sum of Re and Y is from 0.01:1 to 2:1. The metal nano-particles are added into the yttrium oxide phosphor doped with Re, thus improving the luminous efficiency of the phosphor, meanwhile, the material is oxide phosphor, which has a long work life. By changing the type and ratio of Re, the phosphor can radiate light with different wavelength. The addition of the conductive material of Zn 1-x Al x O leads to further improvement of conductivity of the phosphor, thus enhancing the emission luminance of the phosphor. The conductivity of the phosphor can be further improved by changing the amount of Zn and Al in Zn 1-x Al x O. 
     An embodiment of a preparation method of the yttrium oxide phosphor mixture is provided with the following technical solutions: 
     One, selection of the chemical compounds and raw materials: 
     1. selection of the raw materials in preparation of Zn 1-x Al x O colloid. 
     Selection of zinc salt: zinc acetate (Zn(CH 3 COO) 2 .2H 2 O), zinc nitrate (Zn(NO 3 ) 2 .6H 2 O), zinc chloride (ZnCl 2 .2H 2 O), zinc sulfate (ZnSO 4 .7H 2 O) of analytical grade; 
     Selection of aluminum salt: aluminum nitrate (Al(NO 3 ) 3 .9H 2 O), aluminum chloride (AlCl 3 .6H 2 O), aluminum sulfate (Al 2 (SO 4 ) 3 ), .etc of analytical grade; 
     Selection of stabilizer: monoethanolamine (C 2 H 7 NO), diethanolamine (C 4 H 11 NO 2 ), triethanolamine (C 6 H 15 O 3 N) of analytical grade; 
     Selection of solvent: ethylene glycol monomethyl ether (C 3 H 8 O 2 ), ethanol solution (a ratio of ethanol to deionized water ranges from (3-7): 1) of analytical grade. 
     2. selection of the chemical compounds and raw materials in preparation of Y, Re colloid containing metal nano-particle M or ion M: 
     The raw materials of metal oxide are Y 2 O 3 , Eu 2 O 3 , Tb 4 O 7 ; 
     The raw materials of hydrochloric acid salts are YCl 3 .7H 2 O, EuCl 3 , TbCl 3 .6H 2 O; 
     The raw materials of nitrates are Y(NO 3 ) 3 .6H 2 O, Eu(NO 3 ) 3 .6H 2 O, Tb(NO 3 ) 3 .6H 2 O; 
     The raw materials of oxalates are oxalates which can provide Y 3+ , Eu 3+ , and Tb 3+ ; 
     Analytical grade hydrochloric acid or analytical nitrate (HNO 3 : 65%˜68%, concentration: 14.4˜15.2 mol/L; HCl: 36˜37%, concentration: 11.7 mol/L) are used to dissolve oxide and oxalates; 
     The solvent is deionized water (H 2 O) or mixed solution containing anhydrous ethanol (CH 3 CH 2 OH) and deionized water, where the ratio of ethanol to the deionized water is in a range of (1˜9):1; 
     The complexing agent is analytical grade citric acid (C 6 H 8 O 7 .H 2 O); 
     The surfactant is selected from at least one of the group consisting of polyethylene glycol 6000, polyethylene glycol 8000, polyethylene glycol 10000 and polyethylene glycol 20000 of analytical grade. 
     The raw materials of M are nano-particles of Ag, Au, Pt, Pd; or such salts can be dissolved in water or ethanol as AgNO 3 , HAuCl 4 , H 2 PtCl 6 , H 2 PdCl 4 . 
     Two, the preparation of phosphor 
       FIG. 1  illustrates a preparation method of the phosphor including the following steps: 
     S10, preparation of a Zn 1-xl Al   x O colloid. 
     Zinc salt and aluminum salt with a certain mass ratio are weighed respectively according to the chemical formula of Zn 1-x Al x O, where 0&lt;x≦0.05. After the zinc salt and aluminum salt are dissolved with a solvent, stabilizing agent is added to prepare a mixed solution having a total mole concentration of zinc ion and aluminum ion of from 0.05 to 0.70 mol/L. The mixed solution is stirred in a water bath of 40° C. to 70° C. for 4 to 8 hours to obtain a precursor solution, and then the precursor solution is placed in a 60° C. to 90° C. oven and aged for 40 to 60 hours to obtain the Zn 1-x Al x O colloid. 
     S20, preparation of Y, Re colloid containing metal element. 
     Raw materials of Y and Re are weighed respectively according to a doping concentration of Re in Y 2 O 3  of 0.1% to 10% to prepare a Y, Re solution having a sum ion concentration of 0.1 mol/L to 2.00 mol/L, where the Y, Re solution is a Y, Re aqueous solution or an aqueous ethanol solution. The Y, Re solution is measured, and ethanol, raw material of M, a complexing agent and a surfactant are added successively, to prepare a Y, Re alcohol aqueous solution, where the ratio of water to alcohol in the Y, Re alcohol aqueous solution is from 1:1 to 9:1, the sum of mole concentration of Y and Re is 0.1 mol/L to 11.0 mol/L, the mole ratio of the complexing agent to the sum of Y and Re is from 1:1 to 5:1, the concentration of the surfactant is 0.05 mol/L to 0.20 mol/L. In a preferable embodiment, when preparing the Y, Re alcohol aqueous solution, deionized water can be added to maintain the alcohol-water ratio in the Y, Re alcohol aqueous solution. The Y, Re alcohol aqueous solution is stirred in a water bath of 40° C. to 60° C. for 4 to 6 hours, and placed in a 60° C. to 90° C. oven and aged for 56 to 90 hours to obtain the Y, Re colloid containing metal element. 
     When the added raw material of M is metal nano-particle, the metal element in the Y, Re colloid is in a form of nano-particle; when the added raw material of M is metal salt solution, the metal element in the Y, Re colloid is in a form of ion. 
     During the preparation of the Y, Re aqueous solution, if the hydrochloric acid salts or the nitrates Y(NO 3 ) 3 .6H 2 O, Eu(NO 3 ) 3 .6H 2 O, Tb(NO 3 ), YCl 3 .7H 2 O, EuCl 3 , TbCl 3 .6H 2 O are used as the raw materials, a proper amount of the chemical compounds is weighed and dissolved in a vessel directly with deionized water. If the metal oxides or the oxalates are used as the raw materials, the metal oxides or the oxalates corresponding to the Y, Re are dissolved in a vessel with analytical grade hydrochloric acid or nitric acid under a condition of 15° C. to 100° C. with stirring. 
     S30, mixing, aging and heat treating of Zn 1-x Al x O colloid and Y, Re colloid. 
     The Zn 1-x Al x O colloid and the Y, Re colloid are mixed while maintaining the ratio of the sum of molar amount of Zn and Al to the sum of molar amount of Re and Yin the mixture colloid being in a range of 0.01:1 to 2:1. The mixture is then stirred in a water bath of 15° C. to 80° C. for 1 to 4 hours to produce a mixture colloid. The mixture colloid is aged in a 100° C. to 200° C. oven for 48 to 96 hours. After drying, the mixture colloid is placed in a crucible at 800° C. to 1300° C. for 0.5 to 6 hours under an air atmosphere or a carbon reducing atmosphere or a hydrogen-nitrogen reducing atmosphere to obtain the yttrium oxide phosphor mixture, where the proportion of hydrogen to nitrogen in the hydrogen-nitrogen atmosphere is 95:5. 
     In the preferable embodiment, when the Re in the yttrium oxide phosphor contains Terbium, the reducing atmosphere is used; when the Re contains only Europium, the air atmosphere is used. M in ionic state is reduced to a simple substance of nano-particle state during the heat treatment operation. When the Re contains only Europium, the air atmosphere is used, however, it is found that M in ionic state is also reduced to obtain the simple substance of nano-particle state. 
       FIG. 2  shows a spectrum of the yttrium oxide phosphor mixture prepared according to the present invention and commercial broadband spectrum phosphor under a cathode ray excitation. 
     The spectrum is obtained using Shimadzu RF5301PC spectrometer under a 5kv voltage test conditions, where a represents a spectra of an Y 2 O 3 :Re phosphor adding Ag nano-particle and Zn 1-x Al x O prepared according to Example  1 , b  represents a spectra of commercial broadband spectrum phosphor. It is calculated by Shimadzu RF5301PC spectrometer software that, the integral area of  a  is 1.49 times of the integral area of  b.    
     In other words, the luminous efficiency of the Y 2 O 3 :Re phosphor adding Ag nano-particle and Zn 1-x Al x O prepared according to Example 1 is significantly improved compared to the commercial broadband spectrum phosphor. 
     The preparation method of the yttrium oxide phosphor mixture will further be described below mainly with reference to the specific examples. 
     EXAMPLE 1 
     2.1292g of Zn(CH 3 COO) 2 .2H 2 O, 0.1125 g of Al(NO 3 ) 3 .9H 2 O, and 0.6 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. Glycol ether was added to make 50 ml, stirred at a 60° C. water bath for 4 hours to obtain a clear precursor solution of Zn 0.97 Al 0.03 O. The precursor solution of Zn 0.97 Al 0.03 O was placed in a 60° C. oven and aged for 70 hours to form an even Zn 0.97 Al 0.03 O colloid. 
     37.9180 g of Y(NO 3 ) 3 .6H 2 O and 0.4441 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 1%. 4 ml of Y, Eu aqueous solution of 1 mol/L were measured, 1 ml of deionized water and 35 ml of anhydrous ethanol were added as solvent, 0.4 ml of AgNO 3  solution of 0.01 mol/L was added, 3.0742 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 90° C. oven and aged for 40 hours to form an even Y, Eu colloid. 
     1ml of resulting Zn 0.97 Al 0.03 O colloid was added into the Y, Eu colloid, the mixture was stirred at 15° C. for 2 hours, dried in a 100° C. oven for 48 hours, insulated in an 800° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Ag nano-particle and Zn 0.97 Al 0.03 O. 
     EXAMPLE 2 
     0.5460g of Zn(CH 3 COO) 2 .2H 2 O, 0.0047g of Al(NO 3 ) 3 .9H 2 O, and 0.4ml C 6 H 15 O 3 N were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 4:1 was added to make 50 ml, stirred at a 40° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.995 Al 0.005 O. The precursor solution of Zn 0.995 Al 0.005 O was placed in a 50° C. oven and aged for 90 hours to form an even Zn 0.995 Al 0.005 O colloid. 
     18.7675 g of Y(NO 3 ) 3 .6H 2 O and 0.4461 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Eu aqueous solution of 0.5 mol/L with a doping concentration of Eu in Y of 2%. 8 ml of Y, Eu aqueous solution of 0.50 mol/L were measured, 32 ml of anhydrous ethanol were added as solvent, 2.5 ml of Ag nano-particle solution of 0.001 mol/L was added, 7.6856 g of citric acid and 2 g of polyethylene glycol 8000 were added, stirred in a 40° C. water bath for 6 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 90° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     0.4ml of resulting Zn 0.995 Al 0.005 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 50° C. water bath for 2 hours, dried in a 150° C. oven for 96 hours, insulated in a 1300° C. muffle furnace for 0.5 hours to obtain Y 2 O 3 :Eu phosphor doped with Ag nano-particle and Zn 0.995 Al 0.005 O. 
     EXAMPLE 3 
     3.1937g of Zn(CH 3 COO) 2 .2H 2 O, 0.1688 g of Al(NO 3 ) 3 .9H 2 O, and 0.9 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, stirred at a 60° C. water bath for 8 hours to obtain a clear precursor solution of Zn 0.97 Al 0.03 O. The precursor solution of Zn 0.97 Al 0.03 O was placed in a 60° C. oven and aged for 65 hours to form an even Zn 0.97 Al 0.03 O colloid. 
     10.7260 g of Y 2 O 3  and 0.8798 g of Eu 2 O 3  were weighed and dissolved in 27 ml of hydrochloric acid at 60° C.; deionized water was added to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 5%. 8 ml of Y, Eu aqueous solution of 1.00 mol/L were measured, 32 ml of anhydrous ethanol were added as solvent, 1.6 ml of Pt nano-particle solution of 0.001 mol/L was added, 6.1485 g of citric acid and 5 g of polyethylene glycol 6000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 70° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     26ml of resulting Zn 0.97 Al 0.03 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 80° C. water bath for 2 hours, dried in a 100° C. oven for 48 hours, insulated in an 800° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Pt nano-particle and Zn 0.97 Al 0.03 O. 
     EXAMPLE 4 
     1.0865g of Zn(CH 3 COO) 2 .2H 2 O, 0.0188g of Al(NO 3 ) 3 .9H 2 O, and 0.4 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 5:1 was added to make 50 ml, stirred at a 50° C. water bath for 6 hours to obtain a clear precursor solution of Zn 0.985 Al 0.015 O. The precursor solution of Zn 0.985 Al 0.015 O was placed in a 60° C. oven and aged for 80 hours to form an even Zn 0.985 Al 0.015 O colloid. 
     37.9180 g of Y(NO 3 ) 3 .6H 2 O and 0.4441 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 1%. 20 ml of Y, Eu aqueous solution of 1 mol/L were measured, 20 ml of anhydrous ethanol were added as solvent, 0.4 ml of Pt nano-particle solution of 0.01 mol/L was added, 15.3712 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in an 80° C. oven and aged for 56 hours to form an even Y, Eu colloid. 
     1ml of resulting Zn 0.985 Al 0.015 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 100° C. oven for 48 hours, insulated in an 800° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Pd nano-particle and Zn 0.985 Al 0.015 O. 
     EXAMPLE 5 
     2.4810g of ZnC1 2 .2H 2 O, 0.1448g of AlCl 3 .6H 2 O, and 1.5 ml C 4 H 11 NO 2  were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 3:1 was added to make 50 ml, stirred at a 70° C. water bath for 8 hours to obtain a clear precursor solution of Zn 0.96 Al 0.04 O. The precursor solution of Zn 0.96 Al 0.04   0  was placed in a 60° C. oven and aged for 70 hours to form an even Zn 0.96 Al 0.04 O colloid. 
     76.5254 g of Y(NO 3 ) 3 .6H 2 O and 0.0892 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water to prepare a 100 ml of Y, Eu aqueous solution of 2 mol/L with a doping concentration of Eu of 0.1%. 20 ml of Y, Eu aqueous solution of 2.00 mol/L were measured, 20 ml of anhydrous ethanol were added as solvent, 0.8 ml of Ag nano-particle solution of 0.001 mol/L was added, 7.6856 g of citric acid and 8 g of polyethylene glycol 10000 were added, stirred in a 50° C. water bath for 6 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 60° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     6.7ml of resulting Zn 0.96 Al 0.04 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 80° C. water bath for 4 hours, dried in a 200° C. oven for 50 hours, insulated in a 1000° C. muffle furnace for 3 hours to obtain Y 2 O 3 :Eu phosphor doped with Ag nano-particle and Zn 0.96 Al 0.04 O. 
     EXAMPLE 6 
     1.0865g of Zn(CH 3 COO) 2 .2H 2 O, 0.0188 g of Al(NO 3 ) 3 .9H 2 O, and 0.4 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 5:1 was added to make 50 ml, stirred at a 50° C. water bath for 6 hours to obtain a clear precursor solution of Zn 0.99  Al 0.01 O. The precursor solution of Zn 0.99  Al 0.01 O was placed in a 70° C. oven and aged for 80 hours to form an even Zn 0.99 Al 0.01 O colloid. 
     37.9180 g of Y(NO 3 ) 3 .6H 2 O and 0.4441 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 1%. 20 ml of Y, Eu aqueous solution of 1.00 mol/L were measured, 20 ml of anhydrous ethanol were added as solvent, 2 ml of H 2 PdCl 4  solution of 0.1 mol/L was added, 15.3712 g of citric acid and 5 g of polyethylene glycol 20000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in an 80° C. oven and aged for 56 hours to form an even Y, Eu colloid. 
     1ml of resulting Zn 0.99 Al 0.01 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 100° C. oven for 96 hours, insulated in an 800° C. muffle furnace for 6 hours to obtain Y 2 O 3 :Eu phosphor doped with Pd nano-particle and Zn 0.99 Al 0.01 O. 
     EXAMPLE 7 
     4.2583 g of Zn(CH 3 COO) 2 .2H 2 O, 0.2251 g of Al(NO 3 ) 3 .9H 2 O, and 2 ml C 4 H 11 NO 2  were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, was added to make 50 ml, stirred at a 60° C. water bath for 4 hours to obtain a clear precursor solution of Zn 0.97 Al 0.03 O. The precursor solution of Zn 0.97 Al 0.03 O was placed in a 60° C. oven and aged for 78 hours to form an even Zn 0.97 Al 0.03 O colloid. 
     37.5350 g of Y(NO 3 ) 3 .6H 2 O and 0.9061 g of Tb(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Tb in Y of 2%. 12 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 28 ml of anhydrous ethanol were added as solvent, 0.6 ml of Au nano-particle solution of 0.001 mol/L was added, 9.2227 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in a 90° C. oven and aged for 56 hours to form an even Y, Tb colloid. 
     15 ml of resulting Zn 0.97 Al 0.03 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 100° C. oven for 96 hours, insulated in a 1000° C. muffle furnace for 2 hours in a carbon reducing atmosphere to obtain Y 2 O 3 :Tb phosphor doped with Au nano-particle and Zn 0.97 Al 0.03 O. 
     EXAMPLE 8 
     7.2984 g of Zn(CH 3 COO) 2 .2H 2 O, 0.6565 g of Al(NO 3 ) 3 .9H 2 O, and 6 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 6:1 was added to make 50ml, stirred at a 70° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.95 Al 0.05 O. The precursor solution of Zn 0.95 Al 0.05 O was placed in a 60° C. oven and aged for 85 hours to form an even Zn 0.95 Al 0.05 O colloid. 
     31.1728 g of YCl 3  and 1.1198 g of TbCl 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 3%. 4 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 36 ml of anhydrous ethanol were added as solvent, 0.4 ml of H 2 PtCl 6  solution of 0. 1 mol/L was added, 6.2125 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 5 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in a 60° C. oven and aged for 60 hours to form an even Y, Tb colloid. 
     4 ml of resulting Zn 0.95 Al 0.05 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 70° C. water bath for 4 hours, dried in a 180° C. oven for 60 hours, insulated in a 1000° C. muffle furnace under a hydrogen-nitrogen reducing atmosphere for 3 hours to obtain Y 2 O 3 :Tb phosphor doped with Pt nano-particle and Zn 0.95 Al 0.05 O. 
     EXAMPLE 9 
     2.9452 g of Zn(NO 3 ) 2 .6H 2 O, 0.0241 g of AlCl 3 .6H 2 O, and 0.6ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, stirred at a 60° C. water bath for 7 hours to obtain a clear precursor solution of Zn 0.99 Al 0.01 O. The precursor solution of Zn 0.99 Al 0.01 O was placed in a 60° C. oven and aged for 56 hours to form an even Zn 0.99 Al 0.01 O colloid. 
     28.6899 g of oxalate yttrium and 1.7201 g of oxalic acid europium were weighed and dissolved in 20 ml of nitrate at 15° C. with stirring; deionized water was added to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu of 5%. 20 ml of Y, Eu aqueous solution of 1.00 mol/L were measured, 20 ml of anhydrous ethanol were added as solvent, 0.2 ml of HAuCl 4  solution of 0.1 mol/L was added, 7.6856 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 60° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     5 ml of resulting Zn 0.99 Al 0.01 O colloid was added into the Y, Eu colloid, the mixture was stirred in an 80° C. water bath for 2 hours, dried in a 100° C. oven for 56 hours, insulated in an 800° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Au nano-particle and Zn 0.99 Al 0.01 O. 
     EXAMPLE 10 
     9.8596 g of ZnSO4.7H 2 O, 0.2395g of Al 2 (SO 4 ) 3 , and 4.7 ml C 6 H 15 O 3 N were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, stirred at a 60° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.98 Al 0.02 O. The precursor solution of Zn 0.98 Al 0.02 O was placed in a 60° C. oven and aged for 60 hours to form an even Zn 0.98 Al 0.02 O colloid. 
     11.0647 g of Y 2 O 3  and 0.3739 g of Tb 4 O 7  were weighed and dissolved in 27 ml of hydrochloric acid at 100° C. with stirring; deionized water was added to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Tb of 2%. 15 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 25 ml of anhydrous ethanol were added as solvent, 0.75 ml of HAuCl 4  solution of 0.01 mol/L was added, 5.7642 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 50° C. water bath for 5 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in a 90° C. oven and aged for 60 hours to form an even Y, Tb colloid. 
     10 ml of resulting Zn 0.98 A1 0.02 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 130° C. oven for 59 hours, insulated in a 1100° C. muffle furnace under a hydrogen-nitrogen reducing atmosphere for 2 hours to obtain Y 2 O 3 :Tb phosphor doped with Au nano-particle and Zn 0.98 Al 0.02 O. 
     EXAMPLE 11 
     2.1292 g of Zn(CH 3 COO) 2 .2H 2 O, 0.1125 g of Al(NO 3 ) 3 .9H 2 O, and 0.6 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, was added to make 50 ml, stirred at a 60° C. water bath for 4 hours to obtain a clear precursor solution of Zn 0.97 Al 0.03 O. The precursor solution of Zn 0.97 Al 0.03 O was placed in a 60° C. oven and aged for 70 hours to form an even Zn 0.97 Al 0.03 O colloid. 
     37.9180 g of Y(NO 3 ) 3 .6H 2 O and 0.4441 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Tb in Y of 1%. 4 ml of Y, Eu aqueous solution of 1.00 mol/L were measured, 1 ml of deionized water and 35 ml of anhydrous ethanol were added as solvent, 2.0 ml of Pd nano-particle solution of 0.01 mol/L was added, 3.0742 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 90° C. oven and aged for 40 hours to form an even Y, Eu colloid. 
     1 ml of resulting Zn 0.97 Al 0.03 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 130° C. oven for 59 hours, insulated in a 1100° C. muffle furnace for 2 hours in a carbon reducing atmosphere to obtain Y 2 O 3 :Eu phosphor doped with Pd nano-particle and Zn 0.97 Al 0.03 O. 
     EXAMPLE 12 
     6.9733 g of ZnSO4.7H 2 O, 0.1283g of Al 2 (SO 4 ) 3 , and 1.5 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 7:1 was added to make 50 ml, stirred at a 60° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.985 Al 0.015 O. The precursor solution of Zn 0.985 Al 0.015 O was placed in a 60° C. oven and aged for 90 hours to form an even Zn 0.985 Al 0.015 O colloid. 
     27.1780 g of oxalic yttrium, and 3.5099 g of oxalic acid terbium were weighed and dissolved in 20 ml of nitrate at 15° C. with stirring; deionized water was added to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Tb of 10%. 10 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 30 ml of anhydrous ethanol were added as solvent, 0.8 ml of AgNO 3  solution of 0.1 mol/L was added, 7.6858 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in an 80° C. oven and aged for 50 hours to form an even Y, Tb colloid. 
     10 ml of resulting Zn 0.985 Al 0.015 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 100° C. oven for 53 hours, insulated in a 1300° C. muffle furnace under a hydrogen-nitrogen reducing atmosphere for 2 hours to obtain Y 2 O 3 :Tb phosphor doped with Ag nano-particle and Zn 0.985 Al 0.15 O. 
     EXAMPLE 13 
     2.4810 g of ZnC1 2 .2H 2 O, 0.1448 g of AlCl 3 .6H 2 O, and 1.5 ml C 4 H 11 NO 2  were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 3:1 was added to make 50 ml, stirred at a 70° C. water bath for 8 hours to obtain a clear precursor solution of Zn 0.96 Al 0.04 O. The precursor solution of Zn 0.96 Al 0.04 O was placed in a 60° C. oven and aged for 70 hours to form an even Zn 0.96 Al 0.04 O colloid. 
     76.5254 g of Y(NO 3 ) 3 .6H 2 O and 0.0892 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water to prepare a 100 ml of Y, Eu aqueous solution of 2 mol/L with a doping concentration of Eu of 0.1%. 20 ml of Y, Eu aqueous solution of 2.00 mol/L were measured, 20 ml/L of anhydrous ethanol were added as solvent, 2.0 ml of Pd nano-particle solution of 0.01 mol/L was added, 7.6856 g of citric acid and 8 g of polyethylene glycol 10000 were added, stirred in a 50° C. water bath for 6 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 60° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     6.7 ml of resulting Zn 0.96 Al 0.04 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 130° C. oven for 59 hours, insulated in a 1200° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Pd nano-particle and Zn 0.96 Al 0.04 O. 
     EXAMPLE 14 
     0.5460 g of Zn(CH 3 COO) 2 .2H 2 O, 0.0047 g of Al(NO 3 ) 3 .9H 2 O, and 0.4 ml C 6 H 15 O 3 N were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 4:1 was added to make 50ml, stirred at a 40° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.995 Al 0.005 O. The precursor solution of Zn 0.995 Al 0.005 O was placed in a 60° C. oven and aged for 90 hours to form an even Zn 0.995 Al 0.005 O colloid. 
     18.7675 g of Y(NO 3 ) 3 .6H 2 O and 0.4461 g of Eu(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Eu aqueous solution of 0.5 mol/L with a doping concentration of Eu in Y of 2%. 8 ml of Y, Eu aqueous solution of 0.50 mol/L were measured, 32 ml of anhydrous ethanol were added as solvent, 0.8 ml of HAuCl 4  solution of 0.01 mol/L was added, 7.6856 g of citric acid and 2 g of polyethylene glycol 10000 were added, stirred in a 40° C. water bath for 6 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 90° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     0.4 ml of resulting Zn 0.995 Al 0.005 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 60° C. water bath for 2 hours, dried in a 130° C. oven for 59 hours, insulated in an 1200° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Au nano-particle and Zn 0.995 Al 0.005 O. 
     EXAMPLE 15 
     3.1937 g of Zn(CH 3 COO) 2 .2H 2 O, 0.1688 g of Al(NO 3 ) 3 .9H 2 O, and 0.9 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50ml, stirred at a 60° C. water bath for 8 hours to obtain a clear precursor solution of Zn 0.97 Al 0.03 O. The precursor solution of Zn 0.97 Al 0.03 O was placed in a 60° C. oven and aged for 65 hours to form an even Zn 0.97 Al 0.03 O colloid. 
     10.7260 g of Y 2 O 3  and 0.8798 g of Eu 2 O 3  were weighed and dissolved in 27 ml of hydrochloric acid at 60° C. with stirring, deionized water was added to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 5%. 8 ml of Y, Eu aqueous solution of 1.00 mol/L were measured, 32 ml of anhydrous ethanol were added as solvent, 1.6 ml of Au nano-particle solution of 0.001 mol/L was added, 6.1485 g of citric acid and 5 g of polyethylene glycol 6000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 70° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     26 ml of resulting Zn 0.97 Al 0.03 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 75° C. water bath for 2 hours, dried in a 100° C. oven for 48 hours, insulated in an 800° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Au nano-particle and Zn 0.97 Al 0.03 O. 
     EXAMPLE 16 
     2.9452 g of Zn(NO 3 ) 2 .6H 2 O, 0.0241 g of AlCl 3 .6H 2 O, and 0.6ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, stirred at a 60° C. water bath for 7 hours to obtain a clear precursor solution of Zn 0.99 Al 0.01 O. The precursor solution of Zn 0.99 Al 0.01 O was placed in a 60° C. oven and aged for 56 hours to form an even Zn 0.99 Al 0.01 O colloid. 
     28.6899 g of oxalate yttrium and 1.7201 g of oxalic acid europium were weighed and dissolved in 20 ml of nitrate; deionized water was added to prepare a 100 ml of Y, Eu aqueous solution of 1 mol/L with a doping concentration of Eu of 5%. 20 ml of Y, Eu aqueous solution of 1.00 mol/L were measured, 20 ml of anhydrous ethanol were added as solvent, 0.4 ml of AgNO 3  solution of 0.1 mol/L was added, 7.6858 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Eu colloid. The obtained precursor solution of Y, Eu colloid was placed in a 60° C. oven and aged for 60 hours to form an even Y, Eu colloid. 
     5 ml of resulting Zn 0.99 Al 0.01 O colloid was added into the Y, Eu colloid, the mixture was stirred in a 65° C. water bath for 2 hours, dried in a 100° C. oven for 48 hours, insulated in a 900° C. muffle furnace for 2 hours to obtain Y 2 O 3 :Eu phosphor doped with Ag nano-particle and Zn 0.99 Al 0.01 O. 
     EXAMPLE 17 
     4.2583 g of Zn(CH 3 COO) 2 .2H 2 O, 0.2251 g of Al(NO 3 ) 3 .9H 2 O, and 2 ml C 4 H 11 NO 2  were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50 ml, was added to make 50 ml , stirred at a 60° C. water bath for 4 hours to obtain a clear precursor solution of Zn 0.97 Al 0.03 O. The precursor solution of Zn 0.97 Al 0.03 O was placed in a 60° C. oven and aged for 78 hours to form an even Zn 0.97 Al 0.03 colloid. 
     37.5350 g of Y(NO 3 ) 3 .6H 2 O and 0.9061 g of Tb(NO 3 ) 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Tb in Y of 2%. 12 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 28 ml of anhydrous ethanol were added as solvent, 0.24 ml of Pt nano-particle solution of 0.001 mol/L was added, 9.2227 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in a 90° C. oven and aged for 56 hours to form an even Y, Tb colloid. 
     15 ml of resulting Zn 0.97 Al 0.03 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 55° C. water bath for 2.5 hours, dried in a 150° C. oven for 90 hours, insulated in a 1300° C. muffle furnace for 0.5 hour in a carbon reducing atmosphere to obtain Y 2 O 3 :Tb phosphor doped with Pt nano-particle and Zn 0.97 Al 0.03 O. 
     EXAMPLE 18 
     6.9733 g of ZnSO4.7H 2 O, 0.1283 g of Al 2 (SO 4 ) 3 , and 1.5 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 7:1 was added to make 50 ml, stirred at a 60° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.985 Al 0.15 O. The precursor solution of Zn 0.985 Al 0.015 O was placed in a 60° C. oven and aged for 90 hours to form an even Zn 0.985 Al 0.015 O colloid. 
     27.1780 g of oxalic yttrium and 3.5099 g of oxalic acid terbium were weighed and dissolved in 20 ml of nitrate at 15° C. with stirring; deionized water was added to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Tb of 10%. 10 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 30 ml of anhydrous ethanol were added as solvent, 0.1 ml of H 2 PdCl 4  solution of 0.1 mol/L was added, 7.6858 g of citric acid and 5 g of polyethylene glycol 6000 were added, stirred in a 60° C. water bath for 4 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in an 80° C. oven and aged for 50 hours to form an even Y, Tb colloid. 
     10 ml of resulting Zn 0.985 Al 0.015 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 80° C. water bath for 1 hour, dried in a 170° C. oven for 96 hours, insulated in a 800° C. muffle furnace under a carbon reducing atmosphere for 0.5 hour to obtain Y 2 O 3 :Tb phosphor doped with Pd nano-particle and Zn 0.985 Al 0.015 O. 
     EXAMPLE 19 
     9.6620 g of ZnSO4.7H 2 O, 0.2395g of Al 2 (SO 4 ) 3 , and 4.7 ml C 6 H 15 O 3 N were weighed and placed in a vessel at room temperature. A methoxyethanol was added to make 50ml, stirred at a 60° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.98 Al 0.02 O. The precursor solution of Zn 0.98 Al 0.02 O was placed in a 60° C. oven and aged for 60 hours to form an even Zn 0.98 Al 0.02 O colloid. 
     11.0647 g of Y 2 O 3  and 0.3739 g of Tb 4 O 7  were weighed and dissolved in 27 ml of hydrochloric acid at 100° C. with stirring; deionized water was added to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Tb of 2%. 15 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 25 ml of anhydrous ethanol were added as solvent, 3.0 ml of Ag nano-particle solution of 0.001 mol/L was added, 5.7642 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 50° C. water bath for 5 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in a 90° C. oven and aged for 60 hours to form an even Y, Tb colloid. 
     10 ml of resulting Zn 0.98 Al 0.02 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 50° C. water bath for 2 hours, dried in a 180° C. oven for 85 hours, insulated in a 1300° C. muffle furnace under a carbon reducing atmosphere for 0.5 hour to obtain Y 2 O 3 :Tb phosphor doped with Ag nano-particle and Zn 0.98 Al 0.02 O. 
     EXAMPLE 20 
     7.2984 g of Zn(CH 3 COO) 2 2H 2 O, 0.6565 g of Al(NO 3 ) 3 .9H 2 O, and 6 ml C 2 H 7 NO were weighed and placed in a vessel at room temperature. A mixed solution containing ethanol and water with a volume ratio of 6:1 was added to make 50 ml, stirred at a 70° C. water bath for 5 hours to obtain a clear precursor solution of Zn 0.95 Al 0.05 O. The precursor solution of Zn 0.95 Al 0.05 O was placed in a 60° C. oven and aged for 85 hours to form an even Zn 0.95 Al 0.05 O colloid. 
     31.1728 g of YCl 3  and 1.1198 g of TbCl 3 .6H 2 O were weighed and dissolved in deionized water at room temperature to prepare a 100 ml of Y, Tb aqueous solution of 1 mol/L with a doping concentration of Eu in Y of 3%. 4 ml of Y, Tb aqueous solution of 1.00 mol/L were measured, 36 ml of anhydrous ethanol were added as solvent, 2.0 ml of Pt nano-particle solution of 0.001 mol/L was added, 6.2125 g of citric acid and 5 g of polyethylene glycol 10000 were added, stirred in a 60° C. water bath for 5 hours to obtain a clear precursor solution of Y, Tb colloid. The obtained precursor solution of Y, Tb colloid was placed in a 60° C. oven and aged for 60 hours to form an even Y, Tb colloid. 
     4 ml of resulting Zn 0.95 Al 0.05 O colloid was added into the Y, Tb colloid, the mixture was stirred in a 75° C. water bath for 3.5 hours, dried in a 160° C. oven for 96 hours, insulated in a 1300° C. muffle furnace under a carbon reducing atmosphere for 6 hours to obtain Y 2 O 3 :Tb phosphor doped with Pt nano-particle and Zn 0.95 Al 0.05 O. 
     Although the invention has been described in language specific to structural features and/or methodological acts, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific features or acts described. Rather, the specific features and acts are disclosed as sample forms of implementing the claimed invention.