CN112410028A - Preparation method of red-orange light, blue-violet light conversion agent for agricultural film - Google Patents
Preparation method of red-orange light, blue-violet light conversion agent for agricultural film Download PDFInfo
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- C09K11/66—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing germanium, tin or lead
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- C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
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- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
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- C09K11/7795—Phosphates
Abstract
The invention relates to the field of chemical engineering, in particular to a preparation method of a red orange light blue violet light conversion agent for an agricultural film. The red, orange, blue and violet light conversion agent for the agricultural film has good compatibility with the agricultural film, good dispersibility, strong binding force, wide ultraviolet light conversion range, high light conversion efficiency and high light conversion effect and photosynthesis goodness of fit, and can effectively promote photosynthesis required by crop growth in the agricultural film shed. The invention has the excellent performance of high light conversion efficiency, the light conversion service life can be more than two years, the quality of crops is obviously improved, the occurrence of plant diseases and insect pests is reduced, the cultivated crops have the excellent functions of high yield, good quality and the like.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to a preparation method of a red-orange light blue-violet light conversion agent for an agricultural film.
Background
The light conversion agricultural film is prepared by adding the light conversion agent serving as a functional component into raw materials for preparing the agricultural film from the seventy-eight years of the last century. When sunlight passes through the agricultural film, the light conversion agent converts ultraviolet light which has little or even harmful effect on crops in the sunlight spectrum into red orange light or blue-violet light, and the two lights are necessary for the photosynthesis of the crops. Therefore, the light conversion agent improves the light quality of natural illumination, strengthens the photosynthesis of crops, improves the utilization rate of light energy, increases the yield and the early ripening of the crops, improves the quality of fruits, reduces the dosage of chemical fertilizers and pesticides and the like, so the light conversion agricultural film is widely regarded as 'light fertilizer'.
As an agricultural film light conversion agent, rare earth organic complexes converting ultraviolet light into red orange light are the most representative, and light conversion agents converting ultraviolet light into blue-violet light are less reported.
The organic complex light conversion agent is added into a greenhouse film, and after the organic complex light conversion agent is exposed to sunlight for a long time, the luminous intensity is reduced rapidly under the action of ultraviolet light, and meanwhile, a certain chemical reaction can occur, so that the light conversion agent is decomposed and deteriorated. In addition, in the preparation of agricultural films, various added functional additives such as dripping agents, antifogging agents, antioxidants, light stabilizers and the like have poor compatibility and poor dispersion of the light conversion agents due to the difference of the structure and chemical properties of the light conversion agents and rare earth organic complex light conversion agents, and can also cause phase separation phenomenon, so that the effective luminescent molecules are reduced, the luminous intensity is reduced, the lasting period is shortened, the effective period is only 2-3 months usually, and uncertain factors restrict the light conversion agricultural films from being widely used up to now.
In view of the defects of the rare earth organic complex light conversion agent, the inventor develops an inorganic light conversion agent which has high luminous intensity, good stability and good compatibility with specific functional additives and greenhouse film raw materials. The light conversion agent comprises a component which emits red orange light under the excitation of ultraviolet light of sunlight, and a component which emits blue-violet light.
Disclosure of Invention
The red orange light blue violet light conversion agent for the agricultural film has good organic compatibility with the agricultural film, good dispersibility, strong binding force, wide range of ultraviolet light conversion, high light conversion efficiency and high matching degree of light conversion effect and photosynthesis, can effectively promote photosynthesis required by crop growth in the agricultural film shed, and has excellent performance of high light conversion efficiency. The light conversion life can be more than two years, the quality of crops is obviously improved, the occurrence of plant diseases and insect pests is reduced, and the cultivated crops have excellent functions of high yield, good quality and the like.
The specific technical scheme is as follows:
a preparation method of a red orange light blue purple light conversion agent for agricultural films, wherein the red orange light blue purple light conversion agent is an inorganic compound, and components required for synthesizing the compound are prepared by a high-temperature solid phase method; the red-orange light, blue-violet light conversion agent comprises one or two of red-orange light fluorescent powder and blue-violet light fluorescent powder, and the preparation method comprises the following specific steps:
(1) burdening and mixing; (2) sintering at high temperature; (3) pulverizing and sieving; (4) dispersing and cleaning; (5) carrying out suction filtration and drying; (6) sieving the finished product; (7) and (6) surface treatment.
The red, orange, blue and violet light conversion agent is prepared by pre-treating the particle surface with an organic silane coupling agent, so that the particle has high dispersibility, compatibility and binding force in an agricultural film organic phase, and the light conversion efficiency is further enhanced.
The red-orange light fluorescent powder comprises:
3.5MgO·0.5MgF2·GeO2:Mnx 4+(0＜x≤0.5)；
Y2-x-yO3:Eux 3+My(M is one or more of Gd, Bi, W, In and Ga, x is more than 0 and less than or equal to 0.1, and y is more than 0 and less than or equal to 0.01);
(Sr1-x-y,Mgy)3(PO4)2:Snx 2+(0＜x≤0.1，0＜y≤0.15)；
Y1-x(V1-yPy)O4:Eux 3+(0＜x≤0.05，0＜y≤0.5)；
at least one of the above compounds.
The blue-violet light fluorescent powder comprises:
Ba1-xMgyAl10O17:Eux 2+(0＜x≤0.1，0.8＜y≤1.2)；
Sr5-x(PO4)3Cl:Eux 2+(0＜x≤1.0)；
Y2-xSiO5:Cex 3+(0＜x≤0.1)；
Ba3-xMgSi2O8:Eux 2+(0＜x≤0.1)；
at least one of the above compounds.
The red-orange fluorescent powder is preferably a composition capable of being excited by near ultraviolet or ultraviolet light.
The blue-violet phosphor is preferably a composition capable of being excited by near ultraviolet or ultraviolet light.
Compared with the prior art, the invention has the following beneficial technical effects:
the red, orange, blue and violet light conversion agent for agricultural film has light conversion function after being added in the preparation of agricultural film, and has the advantages of easy obtaining of inorganic material, easy preparation, high light conversion efficiency, good compatibility with agricultural film, long service life, etc. compared with the market organic light conversion agent. According to the difference of the growth of different crops on the photophobia, the light conversion agent combination can be selectively added, under the irradiation of sunlight, the light conversion agent in the agricultural film can effectively absorb the unnecessary purple light (300-360 nm), green light (500-580 nm) and red light (600-680 nm), the growth of the crops is facilitated through light conversion, the crops can obtain sufficient photosynthesis, and the healthy growth of the crops is facilitated.
Drawings
FIG. 1 is a general synthetic route for red orange light compounds and blue violet light compounds listed in the red orange light, blue violet light conversion agent of the present invention.
Detailed Description
The present invention is described in detail below with reference to the drawings and examples, but the scope of the present invention is not limited by the drawings and examples.
Example 1:
wherein the red orange light fluorescent powder: 3.5 MgO.0.5 MgF2·GeO2:Mnx 4+(0＜x≤0.5)；
The preparation method comprises the following steps:
1) taking x as 0.15, and respectively weighing MgO and MgF according to the stoichiometric proportion2、GeO2、MnCO3The materials are fully and uniformly mixed and put into an alumina crucible, and the alumina crucible is placed into a box type air atmosphere furnace, burned at the temperature of 1120 ℃ and kept for 8 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 2:1, and the dispersion time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder with a 200-mesh sieve to obtain a finished product of the red-orange light fluorescent powder.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Wherein, the blue-violet fluorescent powder: ba1-xMgyAl10O17:Eux 2+(0＜x≤0.1，0.8＜y≤1.2)；
The preparation method comprises the following steps:
1) taking x as 0.05 and y as 1.0 to respectively weigh BaCO according to the stoichiometric ratio3、MgO、Eu2O3、Al2O3And 0.3% of H is added3BO3As fluxing agent, mixing and loading into alumina crucible, placing into box-type or tunnel-type hydrogen reduction atmosphere furnace, reducing and firing at 1450 deg.C, and maintaining the temperatureFor 6 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 2:1, and the dispersion time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder through a 200-mesh sieve to obtain a finished blue-violet fluorescent powder product.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Example 2:
wherein the red orange light fluorescent powder: y is2-x-yO3:Eux 3+My(M is one or more of Gd, Bi, W, In and Ga, x is more than 0 and less than or equal to 0.1, and y is more than 0 and less than or equal to 0.01);
the preparation method comprises the following steps:
1) taking x as 0.05, Y as 0.007 and M as Gd, and weighing Y according to the stoichiometric proportion2O3、Eu2O3、Gd2O30.3% by weight of SrB is added4O7As fluxing agent, the materials are fully and evenly mixed and put into an alumina crucible, and the alumina crucible is placed into a box type air atmosphere furnace, and the temperature is 1300 ℃ for 5 hours of burning and heat preservation.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate ball is a PVC ball according to the ball-to-material ratio of 2:1Ball milling and disintegration are carried out in a milling barrel, and the disintegration time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder with a 200-mesh sieve to obtain a finished product of the red-orange light fluorescent powder.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Wherein, the blue-violet fluorescent powder: sr5-x(PO4)3Cl:Eux 2+(0＜x≤1.0)；
The preparation method comprises the following steps:
1) taking x as 0.05, and weighing SrCO according to the stoichiometric proportion3、NH4H2PO4、Eu2O3、SrCl2·H20、NH4Cl, wherein 1.0mole. NH4Adding Cl serving as a fluxing agent, fully and uniformly mixing, putting into an alumina crucible, putting into a box-type or tunnel-type hydrogen reduction atmosphere furnace, reducing and firing at 1450 ℃ for 6 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 2:1, and the dispersion time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder through a 200-mesh sieve to obtain a finished blue-violet fluorescent powder product.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Example 3:
wherein the red orange light fluorescent powder: (Sr)1-x-y,Mgy)3(PO4)2:Snx 2+(0＜x≤0.1，0＜y≤0.15)；
1) Taking x as 0.05 and y as 0.10 to respectively weigh SrCO according to the stoichiometric ratio3、NH4H2PO4、SnO2MgO, 0.3% by weight of Li is added2CO3As fluxing agent, the mixture is fully and evenly mixed, put into an alumina crucible and covered, put into a box type reduction furnace, reduced and burned at 1180 ℃ under 10 percent hydrogen reducing atmosphere, and the heat preservation time is 5 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 1:1, and the dispersion time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder with a 200-mesh sieve to obtain a finished product of the red-orange light fluorescent powder.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Wherein, the blue-violet fluorescent powder: y is2-xSiO5:Cex 3+(0＜x≤0.1)；
The preparation method comprises the following steps:
1) taking x as 0.05, and weighing Y according to the stoichiometric proportion2O3、SiO2、CeO2Adding LiF accounting for 0.3 percent of the weight of the raw materials as a fluxing agent, fully and uniformly mixing the raw materials, putting the mixture into an alumina crucible, covering the crucible, putting the crucible into a box type reduction furnace, reducing and burning the crucible at the high temperature of 1550 ℃ under the atmosphere of 75 percent of hydrogen and 25 percent of nitrogen, and keeping the temperature for 8 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 2:1, and the dispersion time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder through a 200-mesh sieve to obtain a finished blue-violet fluorescent powder product.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Example 4:
wherein the red orange light fluorescent powder: y is1-x(V1-yPy)O4:Eux 3+(0＜x≤0.05，0＜y≤0.5)；
The preparation method comprises the following steps:
1) weighing Y according to stoichiometry when x is 0.05 and Y is 0.302O3、Eu2O3、NH4VO3、(NH4)2HPO4Adding 0.3% by weight of H3BO3As fluxing agent, the mixture is fully mixed and evenly put into an alumina crucible, and then the alumina crucible is put into a box type air furnace and is burnt at 1150 ℃ for 4 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 2:1, and the dispersion time is controlled for 30 minutes.
3) And transferring the materials into a PVC barrel after the materials are disintegrated, firstly soaking the materials in NaOH solution to remove excessive vanadium, stirring and cleaning the materials for 3 times by using deionized water, carrying out vacuum filtration after cleaning, and finally transferring the materials into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder with a 200-mesh sieve to obtain a finished product of the red-orange light fluorescent powder.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
Wherein, the blue-violet fluorescent powder: ba3-xMgSi2O8:Eux 2+(0＜x≤0.1)；
The preparation method comprises the following steps:
1) taking x as 0.05, and respectively weighing BaCO according to the stoichiometric proportion3、MgO、Eu2O3、SiO2Adding 1% by weight of NH4Cl is taken as fluxing agent, is fully and uniformly mixed, is filled into an alumina crucible, is covered with a cover, is placed into a box type hydrogen reduction atmosphere furnace, and is burnt at the temperature of 1250 DEG CAnd keeping the temperature for 6 hours.
2) Cooling, crushing, sieving with 150 mesh sieve, and sieving
The agate balls are ball-milled and dispersed in a ball-milling barrel made of PVC material according to the ball-material ratio of 2:1, and the dispersion time is controlled for 30 minutes.
3) Transferring the obtained product into a PVC barrel after disintegration, stirring and cleaning the obtained product for 3 times by using deionized water, then carrying out vacuum filtration, and finally transferring the obtained product into a hot air circulation oven for drying at 120 ℃ for 12 hours.
4) And cooling the dried powder, and then sieving the powder through a 200-mesh sieve to obtain a finished blue-violet fluorescent powder product.
5) Powder surface treatment: pouring 1000 g of finished product into a 10L nonmetal container with a stirrer, adding 5L of deionized water, keeping the mixture in a continuous stirring state, slowly adding formic acid solution, adjusting the pH value of the feed liquid to be between 4.5 and 5.5, adding 5ml of silane coupling agent (KH560), continuously stirring for 30 minutes, standing for precipitation, removing supernatant, washing with deionized water to be neutral, and finally performing suction filtration, drying and sieving with a 100-mesh sieve.
In the above examples 1-4, the first preparation case of applying the red-orange light phosphor and the blue-violet light phosphor in different proportions to the agricultural film is shown as follows:
surface-conversion agent applied to agricultural film in proportion (weight percent)
| Components | Fluorescent powder | ％ | Fluorescent powder | ％ | In total% |
| Example 1 | Red orange light | 0.15 | Blue-violet light | 0.25 | 0.40 |
| Example 2 | Red orange light | 0.10 | Blue-violet light | 0.20 | 0.30 |
| Example 3 | Red orange light | 0.25 | Blue-violet light | 0.05 | 0.30 |
| Example 4 | Red orange light | 0.30 | Blue-violet light | 0.05 | 0.35 |
The agricultural film made of the light conversion agent is tested in northeast, inner Mongolian, Xinjiang and Hebei areas, and tests are carried out on the planting of such crop varieties as cucumber, tomato, spinach, lettuce, pepper, green bean, grape, strawberry and the like, and the results show that the yield of vegetable crops is increased by 40-60%, the growth cycle is shortened by 1-2 weeks, and the yield of fruits is increased by 30-40%. The analysis result of the pest and disease damage data shows that more than 99 percent of crops do not need to be sprayed with pesticides. The agricultural products have bright appearance and color, greener vegetables and redder tomatoes; the fruit has good taste and the grape is sweet.
Claims (6)
1. A preparation method of a red-orange light-blue-violet light conversion agent for agricultural films is characterized by comprising the following steps: the red, orange, blue and violet light conversion agent is an inorganic compound, and components required for synthesizing the compound are prepared by a high-temperature solid phase method; the red-orange light, blue-violet light conversion agent comprises one or two of red-orange light fluorescent powder and blue-violet light fluorescent powder, and the preparation method comprises the following specific steps:
(1) burdening and mixing; (2) sintering at high temperature; (3) pulverizing and sieving; (4) dispersing and cleaning; (5) carrying out suction filtration and drying; (6) sieving the finished product; (7) and (6) surface treatment.
2. The preparation method of the red-orange light-blue-violet light conversion agent for the agricultural film according to claim 1, which is characterized by comprising the following steps: the red, orange, blue and violet light conversion agent is prepared by pre-treating the particle surface with an organic silane coupling agent, so that the particle has high dispersibility, compatibility and binding force in an agricultural film organic phase, and the light conversion efficiency is further enhanced.
3. The preparation method of the red-orange light-blue-violet light conversion agent for the agricultural film according to claim 1, which is characterized by comprising the following steps: the red-orange light fluorescent powder comprises:
3.5MgO·0.5MgF2·GeO2:Mnx 4+(0＜x≤0.5)；
Y2-x-yO3:Eux 3+My(M is one or more of Gd, Bi, W, In and Ga, x is more than 0 and less than or equal to 0.1, and y is more than 0 and less than or equal to 0.01);
(Sr1-x-y,Mgy)3(PO4)2:Snx 2+(0＜x≤0.1，0＜y≤0.15)；
Y1-x(V1-yPy)O4:Eux 3+(0＜x≤0.05，0＜y≤0.5)；
at least one of the above compounds.
4. The preparation method of the red-orange light-blue-violet light conversion agent for the agricultural film according to claim 1, which is characterized by comprising the following steps: the blue-violet light fluorescent powder comprises:
Ba1-xMgyAl10O17:Eux 2+(0＜x≤0.1，0.8＜y≤1.2)；
Sr5-x(PO4)3Cl:Eux 2+(0＜x≤1.0)；
Y2-xSiO5:Cex 3+(0＜x≤0.1)；
Ba3-xMgSi2O8:Eux 2+(0＜x≤0.1)；
at least one of the above compounds.
5. The preparation method of the red-orange light-blue-violet light conversion agent for the agricultural film according to claim 3, which is characterized by comprising the following steps: the red-orange fluorescent powder is preferably a composition capable of being excited by near ultraviolet or ultraviolet light.
6. The preparation method of the red-orange light-blue-violet light conversion agent for the agricultural film according to claim 4, which is characterized by comprising the following steps: the blue-violet phosphor is preferably a composition capable of being excited by near ultraviolet or ultraviolet light.
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