WO2000073400A1 - A zinc silicate based green fluorescent material - Google Patents

A zinc silicate based green fluorescent material Download PDF

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Publication number
WO2000073400A1
WO2000073400A1 PCT/KR2000/000543 KR0000543W WO0073400A1 WO 2000073400 A1 WO2000073400 A1 WO 2000073400A1 KR 0000543 W KR0000543 W KR 0000543W WO 0073400 A1 WO0073400 A1 WO 0073400A1
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fluorescent material
oxide
green fluorescent
zinc silicate
based green
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PCT/KR2000/000543
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French (fr)
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Hee Dong Park
Kee Sun Sohn
Bong Hyun Cho
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Korea Research Institute Of Chemical Technology
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/54—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing zinc or cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/62—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing gallium, indium or thallium
    • C09K11/621—Chalcogenides
    • C09K11/623—Chalcogenides with zinc or cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/59—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing silicon
    • C09K11/592—Chalcogenides
    • C09K11/595—Chalcogenides with zinc or cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/64—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing aluminium
    • C09K11/646—Silicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/67—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals
    • C09K11/676—Aluminates; Silicates

Definitions

  • the present invention relates to a zinc silicate based green fluorescent material and preparing method thereof and more particularly, to a zinc silicate based green fluorescent material and preparing method thereof expressed in the following formula (1).
  • a co-activator which provides l)excellent luminous efficiency under vacuum ultraviolet, 2)stable physical properties under high vacuum, thus being suitable for the plasma display panel (PDP), Zn 2 _aSi ⁇ -b0 4 : aMn, bM (1) wherein a and b are 0 ⁇ a ⁇ 0.15, 0 ⁇ b ⁇ 0.02, respectively, and M is an atom selected from the group consisting of Al, Ga and Ti.
  • the plasma display panel (PDP) based on the vacuum ultraviolet excitation is a type of display in which the luminescent material illuminates under the ultraviolet produced by the discharge of inert gases in vacuum. It is a promising next-generation flat display capable of complementing the defect of the cathode ray tube (CRT) which is widely used as a display for representation of information.
  • CRT cathode ray tube
  • Zn 2 Si0 doped with manganese has been used for the defects.
  • the inventors of the present invention repeated photoluminescence experiments excited by 147 nm radiation under the same actuating condition used for a real PDP display, and finally discovered that the maximum luminescence efficiency can be obtained when the concentration of manganese (a) doping zinc silicate (Zn 2 Si0 ) lies between 0 ⁇ a ⁇ 0.05.
  • the inventors produced Zn 2 Si0 : Mn based fluorescent materials by using AI-2O3, Ga 0 3 or Ti0 2 as a co-activator, respectively, in addition to Manganese in order to improve luminescence efficiency and shorten the persistence of afterglow, and the photoluminance experiment showed that there was 10% increase in luminescence efficiency measured under the excitation 147 nm radiation using the same condition for a real PDP display.
  • an object of this invention is to provide a zinc silicate based green fluorescent material and preparing method thereof, which has an excellent luminescence efficiency under vacuum ultraviolet and short persistence of afterglow.
  • Fig. 1 is a graph that represents the photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of manganese (a) excited by 147 nm radiation under the vacuum of lO- 4 to lO- 5 .
  • Fig. 2 is a graph that represents the maximum photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of manganese (a) excited by radiations at 147 nm and 254 nm, respectively, under the vacuum of 10 4 to 10 5 .
  • Fig. 1 is a graph that represents the photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of manganese (a) excited by radiations at 147 nm and 254 nm, respectively, under the vacuum of 10 4 to 10 5 .
  • 3 is a graph that represents the photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of A1 0 3 added as a co-activator to Zn ⁇ . 9 sSi0 : 0.02Mn.
  • Zn 2 -aSi ⁇ _b ⁇ 4 aMn, bM (1) wherein a and b are 0 ⁇ a ⁇ 0.15, 0 ⁇ b ⁇ 0.02, respectively, and M is an atom selected from Al, Ga and Ti.
  • Another feature of the present invention is a method of preparing a zinc silicate based green fluorescent material shown in the above formula (1) by the following steps: 1) manganese oxide as an essential component is added to zinc silicate (Zn Si0 ) matrix made from zinc oxide (ZnO) and silica (Si0 2 ), 2) a co- activator selected from the group consisting of aluminum oxide (AI2O3), gallium(III) oxide (Ga 2 ⁇ 3) and titanium oxide (Ti0 2 ) is added to the above mixture, if necessary, and 3) the mixture is baked at 1,100-1,350°C, reduced at 900-l,200°C, and ground and excited.
  • Zn Si0 zinc silicate
  • Si0 2 silica
  • a co- activator selected from the group consisting of aluminum oxide (AI2O3), gallium(III) oxide (Ga 2 ⁇ 3) and titanium oxide (Ti0 2 ) is added to the above mixture, if necessary, and 3) the mixture is baked at 1,100-1,350°C
  • the zinc silicate based green fluorescent material of the present invention prepared by using zinc silicate as matrix and adding the co-activator selected from Al, Ga and Ti, if necessary, as well as manganese oxide as an activator, provides excellent luminescence efficiency under vacuum ultraviolet, stable physical properties under high vacuum, and is thus suitable for the plasma display panel (PDP).
  • manganese oxide (MnO) alone or manganese oxide with the co- activator selected from aluminum oxide (AI2O3), gallium(III) oxide (Ga 2 0 3 ) and titanium oxide (Ti ⁇ 2) is added to the zinc silicate (Zn 2 Si0 4 ) matrix prepared by using zinc oxide (ZnO) and silica (Si ⁇ 2) as sources of the fluorescent material, wherein the contents of zinc oxide (ZnO) and silica (Si0 2 ) are preferred to be adjusted so that the molar ratio of Zn/Si become 2:1 stoichiometrically.
  • each activator doped into the zinc silicate matrix plays an important role and it is more preferred to use manganese oxide (MnO) as an activator along with a third co-activator selected from aluminum oxide (AI2O3), gallium(III) oxide (Ga 2 ⁇ 3)and titanium oxide (Ti0 2 ).
  • MnO manganese oxide
  • a third co-activator selected from aluminum oxide (AI2O3), gallium(III) oxide (Ga 2 ⁇ 3)and titanium oxide (Ti0 2 ).
  • co-activator such as alumium oxide, gallium oxide or titanium oxide are added lower than 0.02 mol per each mol of zinc oxide. If the amount of co- activator is added more than 0.02 molar ratio, the luminescence efficiency will be drastically dropped.
  • the fluorescent matrix material and the activator are weighed to the desired composition, and mixed homogeneously using a ball milling or an agate mortar in acetone solvent. And the mixture is placed into a high-purity alumina crucible and baked for 2 ⁇ 24 hours under atmospheric pressure with the cover capped at a temperature range of 1,100 ⁇ 1,350°C.
  • the baking temperature is very important, since zinc silicate cannot be fully formed if the baking temperature is below 1,100°C, and there occurs a weight loss due to the volatilization if the baking temperature exceeds 1,350°C.
  • the mixture is reduced in reduction environment at 900 ⁇ 1,300°C for 2 - 24 hours in order to obtain a fluorescent material having high luminous efficiency, and ground sufficiently to the size of 1 ⁇ 5 ⁇ m.
  • the fluorescent material obtained from the foregoing procedures is excited using luminescence spectrometer (LS) with the wavelength of 147nm.
  • LS luminescence spectrometer
  • PL photoluminescence
  • the green fluorescent material as expressed in the formula (1) in the present invention exhibits different photoluminescence spectra depending on the concentration of a co-activator.
  • concentration of co-activator (b) is in the range of 0.005 ⁇ 0.02 mol, it shows the maximum photoluminance.
  • the zinc silicate based green fluorescent material of the present invention is useful for a green fluorescent material for plasma display panel (PDP) due to the high luminescence efficiency and the short persistence of afterglow in vacuum ultraviolet.
  • a green fluorescent material expressed in the following formula (1) was obtained.
  • the maximum photoluminescence (PL) spectra of the green fluorescent material obtained, according to the concentrations of manganese when excited under the vacuum of 10 4 to 10 5 to radiation nm and under the vacuum of 10 4 to 10 5 by 254 nm, are represented in Fig. 2.
  • the photoluminescence (PL) has its maximum value when the concentration of manganese (a) is between 0 and 0.05 (0 ⁇ a ⁇ 0.05) while it is extremely decreased when the concentration is out of the range.
  • the zinc silicate based green fluorescent material prepared by adding manganese oxide alone, or adding manganese oxide with a co-activator selected from aluminum oxide, gallium oxide and titanium oxide showed a green luminescence with excellent color purity at 500 - 550nm range under vacuum ultraviolet excitation, thus suggesting that it will be very useful for PDP use.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)

Abstract

The present invention relates to a zinc silicate based green fluorescent material and preparing method thereof, more specifically to a zinc silicate based green fluorescent material and preparing method thereof expressed by the following Formula (1), by doping zinc silicate with manganese oxide and, if necessary, with a co-activator selected from aluminum oxide, gallium oxide and titanium oxide, which has excellent luminous efficiency in vacuum ultraviolet and stable physical properties under high vacuum, and which is suitable for the plasma display panel (PDP) due to the short afterglow time. Zn2-aSi1-bO4 : aMn, bM wherein a and b are 0 < a ≤ 0.15, 0 ≤ b ≤ 0.02, respectively, and M is an atom selected from Al, Ga and Ti.

Description

A ZINC SILICATE BASED GREEN FLUORESCENT MATERIAL
BACKGROUND OF THE INVENTION Field of the Invention
The present invention relates to a zinc silicate based green fluorescent material and preparing method thereof and more particularly, to a zinc silicate based green fluorescent material and preparing method thereof expressed in the following formula (1). by doping zinc silicate with manganese oxide and additionally substituting the position of Si with a co-activator, which provides l)excellent luminous efficiency under vacuum ultraviolet, 2)stable physical properties under high vacuum, thus being suitable for the plasma display panel (PDP), Zn2_aSiι-b04 : aMn, bM (1) wherein a and b are 0 < a < 0.15, 0 < b < 0.02, respectively, and M is an atom selected from the group consisting of Al, Ga and Ti.
Description of the Related Arts The plasma display panel (PDP) based on the vacuum ultraviolet excitation is a type of display in which the luminescent material illuminates under the ultraviolet produced by the discharge of inert gases in vacuum. It is a promising next-generation flat display capable of complementing the defect of the cathode ray tube (CRT) which is widely used as a display for representation of information. For the conventional green luminescent material in the use for PDP, Zn2Si0 doped with manganese has been used. However, it is not suitable for the green fluorescent material in the use for PDP due to the defects, such as long persistence of afterglow and low photoluminance. SUMMARY OF THE INVENTION
To solve the problems of the conventional green photoluminescence for PDP as mentioned above, the inventors of the present invention repeated photoluminescence experiments excited by 147 nm radiation under the same actuating condition used for a real PDP display, and finally discovered that the maximum luminescence efficiency can be obtained when the concentration of manganese (a) doping zinc silicate (Zn2Si0 ) lies between 0 < a < 0.05.
The inventors produced Zn2Si0 : Mn based fluorescent materials by using AI-2O3, Ga 03 or Ti02 as a co-activator, respectively, in addition to Manganese in order to improve luminescence efficiency and shorten the persistence of afterglow, and the photoluminance experiment showed that there was 10% increase in luminescence efficiency measured under the excitation 147 nm radiation using the same condition for a real PDP display. Fluorescent material when provided with manganese (a), a center atom of luminescent material, is set at 0.02 and M (b), a co-activator that helps to increase the energy efficiency of a center atom, is set in between 0.005 and 0.02, was shown to have the most optimal green fluorescent material for PDP use.
Accordingly, an object of this invention is to provide a zinc silicate based green fluorescent material and preparing method thereof, which has an excellent luminescence efficiency under vacuum ultraviolet and short persistence of afterglow.
Brief Description of the Drawings Fig. 1 is a graph that represents the photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of manganese (a) excited by 147 nm radiation under the vacuum of lO-4 to lO-5. Fig. 2 is a graph that represents the maximum photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of manganese (a) excited by radiations at 147 nm and 254 nm, respectively, under the vacuum of 104 to 10 5. Fig. 3 is a graph that represents the photoluminescence spectra of the zinc silicate based green fluorescent materials of this invention according to the concentration of A1 03 added as a co-activator to Znι.9sSi0 : 0.02Mn.
Detailed Description of the Invention The present invention is characterized by the fluorescent materials expressed in the following formula (1),
Zn2-aSiι_bθ4 : aMn, bM (1) wherein a and b are 0 < a < 0.15, 0 < b < 0.02, respectively, and M is an atom selected from Al, Ga and Ti. Another feature of the present invention is a method of preparing a zinc silicate based green fluorescent material shown in the above formula (1) by the following steps: 1) manganese oxide as an essential component is added to zinc silicate (Zn Si0 ) matrix made from zinc oxide (ZnO) and silica (Si02), 2) a co- activator selected from the group consisting of aluminum oxide (AI2O3), gallium(III) oxide (Ga2θ3) and titanium oxide (Ti02) is added to the above mixture, if necessary, and 3) the mixture is baked at 1,100-1,350°C, reduced at 900-l,200°C, and ground and excited.
The detailed description of the present invention is given hereunder. The zinc silicate based green fluorescent material of the present invention, prepared by using zinc silicate as matrix and adding the co-activator selected from Al, Ga and Ti, if necessary, as well as manganese oxide as an activator, provides excellent luminescence efficiency under vacuum ultraviolet, stable physical properties under high vacuum, and is thus suitable for the plasma display panel (PDP).
The preparation method of the green fluorescent material of the present invention is explained in detail as follows.
At first, manganese oxide (MnO) alone or manganese oxide with the co- activator selected from aluminum oxide (AI2O3), gallium(III) oxide (Ga203) and titanium oxide (Tiθ2) is added to the zinc silicate (Zn2Si04) matrix prepared by using zinc oxide (ZnO) and silica (Siθ2) as sources of the fluorescent material, wherein the contents of zinc oxide (ZnO) and silica (Si02) are preferred to be adjusted so that the molar ratio of Zn/Si become 2:1 stoichiometrically. In the present invention, the types and contents of each activator doped into the zinc silicate matrix play an important role and it is more preferred to use manganese oxide (MnO) as an activator along with a third co-activator selected from aluminum oxide (AI2O3), gallium(III) oxide (Ga2θ3)and titanium oxide (Ti02). Here, manganese oxide (a) is added in the range of 0 < a ≤ 0.15 mol and co-activator such as alumium oxide, gallium oxide or titanium oxide are added lower than 0.02 mol per each mol of zinc oxide. If the amount of co- activator is added more than 0.02 molar ratio, the luminescence efficiency will be drastically dropped.
The fluorescent matrix material and the activator are weighed to the desired composition, and mixed homogeneously using a ball milling or an agate mortar in acetone solvent. And the mixture is placed into a high-purity alumina crucible and baked for 2 ~ 24 hours under atmospheric pressure with the cover capped at a temperature range of 1,100 ~ 1,350°C. Here, the baking temperature is very important, since zinc silicate cannot be fully formed if the baking temperature is below 1,100°C, and there occurs a weight loss due to the volatilization if the baking temperature exceeds 1,350°C. After baking, the mixture is reduced in reduction environment at 900 ~ 1,300°C for 2 - 24 hours in order to obtain a fluorescent material having high luminous efficiency, and ground sufficiently to the size of 1 ~ 5μm.
And then, the fluorescent material obtained from the foregoing procedures is excited using luminescence spectrometer (LS) with the wavelength of 147nm. The photoluminescence (PL) of the fluorescent material after the excitation process attests that the maximum peak varies over a range from 500 to 550nm.
The green fluorescent material as expressed in the formula (1) in the present invention exhibits different photoluminescence spectra depending on the concentration of a co-activator. When the concentration of co-activator (b) is in the range of 0.005 ~ 0.02 mol, it shows the maximum photoluminance.
Outside this range, the photoluminance diminishes drastically.
Concluding the above results, the zinc silicate based green fluorescent material of the present invention is useful for a green fluorescent material for plasma display panel (PDP) due to the high luminescence efficiency and the short persistence of afterglow in vacuum ultraviolet.
The following specific examples are intended to be illustrative of the present invention and should not to be construed as limiting the scope of the present invention defined by the appended claims.
Example 1 : Preparation of a Green Fluorescent Material Expressed by Zn1 98Si0 : 0.02Mn
3.6186g (1.98 mol) of zinc oxide and 1.3495g (1.0 mol) of silicon dioxide were weighed. 0.0319g (0.02 mol) of manganese oxide was added and mixed homogeneously using an agate mortar. Acetone was added to prevent spattering and mediate efficient mixing, and no flux was used additionally. The mixture was placed into a high-purity alumina crucible and baked at 1,300°C for 4 hours using electric furnace under atmospheric pressure with the cover capped. After baking, the mixture was cooled down by the rate of 50°C per hour and then was sufficiently ground to give the desired fluorescent material.
Using the same procedure in the above example 1, except adding different amount of manganese, a green fluorescent material expressed in the following formula (1) was obtained. Measurements of the photoluminescence (PL) spectra of the green fluorescent material obtained, according to the different concentrations of manganese when excited under the vacuum of 104 to lO 5 by 147 nm radiation, are represented in Fig. 1. According to Fig. 1, the photoluminescence (PL) spectra show excellent color purity at 500 ~ 550nm range and the photoluminescence (PL) decrease as the amount of manganese being added for doping increases.
And the maximum photoluminescence (PL) spectra of the green fluorescent material obtained, according to the concentrations of manganese when excited under the vacuum of 104 to 10 5 to radiation nm and under the vacuum of 104 to 10 5 by 254 nm, are represented in Fig. 2. According to Fig. 2 the photoluminescence (PL) has its maximum value when the concentration of manganese (a) is between 0 and 0.05 (0 < a < 0.05) while it is extremely decreased when the concentration is out of the range.
Example 2 : Preparation of a Green Fluorescent Material Expressed by
Zn1 98Sio.99θ : 0.02Mn, O.OITi
3.6154g (1.98 mol) of zinc oxide, 1.3348g (0.997 mol) of silicon dioxide and 0.0318g (0.02 mol) of manganese oxide were combined with 0.0179 g of titanium oxide, a co-activator, and mixed homogeneously using an agate mortar. Acetone was added to prevent spattering and mediate efficient mixing, and no flux was used additionally. The mixture was placed into a high-purity alumina crucible and baked at 1,300°C for 4 hours using electric furnace under atmospheric pressure with the cover capped. After baking, the mixture was cooled down by the rate of 50°C per hour and then thoroughly ground. The mixture was reduced for 2 hours at 900°C and ground again to give a green fluorescent material. The photoluminescence (PL) spectra for the prepared green fluorescent material are detected under vacuum.
Example 3 : Preparation of a Green Fluorescent Material Expressed by Zm.9sSio.99O4 : 0.02Mn, 0.01 Al
3.6239g (1.98 mol) of zinc oxide and 1.3245g (0.997 mol) of silicon dioxide, 0.0319g (0.02 mol) of manganese and 0.0115 g (0.01 mol) of aluminum oxide as a co-activator were weighed. 0.0083 g (0.01 mol) of Li2C03 of which lithium has monovalent oxidation number was added to substitute Si-position with Al2θ3(Al3+) and mixed homogeneously using an agate mortar. After that, the same procedure of example 2 was performed to give a green fluorescent material expressed by Zni.9sSio.99O4 : 0.02Mn, 0.01A1. Measurements of the photoluminescence (PL) spectra of the green fluorescent material obtained, according to the different concentrations of aluminum when excited under the vacuum of 104 to lO 5 by 147 nm radiation, are represented in Fig. 3. According to Fig. 3, the photoluminescence (PL) spectra shows excellent color purity at 500 ~ 550nm range.
Example 4 : Preparation of a Green Fluorescent Material Expressed by Zni.9sSio.g9O4 : 0.02Mn, O.OlGa
3.6169g (1.98 mol) of zinc oxide and 1.3219g (0.997 mol) of silicon dioxide, 0.0319g (0.02 mol) of manganese and 0.0210 g (0.01 mol) of gallium oxide as a co-activator were weighed. 0.0083 g (0.01 mol) of Li2C03 of which lithium has monovalent oxidation number was added to substitute Si-position with Ga2θ3(Ga3+) and mixed homogeneously using an agate mortar. After that, the same procedure of example 2 was performed. Using the same procedure as in examples 2 - 4, except adding different kinds and different amount of a co-activator represented in table 1, a green fluorescent material was obtained. The photoluminescence (PL) spectra of the prepared fluorescent material were measured at the excitation state under the vacuum of 104 to 10~5 by 147 nm radiation. The result is shown in table 1. Table 1
Figure imgf000009_0001
As described above, the zinc silicate based green fluorescent material, prepared by adding manganese oxide alone, or adding manganese oxide with a co-activator selected from aluminum oxide, gallium oxide and titanium oxide showed a green luminescence with excellent color purity at 500 - 550nm range under vacuum ultraviolet excitation, thus suggesting that it will be very useful for PDP use.

Claims

CLAIMS What is claimed is:
1. A zinc silicate based green fluorescent material expressed by the following formula (1),
Zn2-aSiι-b04 : aMn, bM (1) wherein a and b are 0 < a < 0.15, 0 < b < 0.02, respectively, and M is an atom selected from Al, Ga and Ti.
2. A method of preparing a zinc silicate based green fluorescent material for plasma display panel (PDP) as expressed in the above formula (1), which comprises the following steps: a) manganese oxide (MnO) alone or manganese oxide combined with a co-activator selected from the group consisting of aluminum oxide
(AI2O3), gallium oxide (Ga2U3) and titanium oxide (ΗO2) is mixed with the zinc silicate (Zn2Si04) matrix made from zinc oxide (ZnO) and silica (Siθ2); and b) the mixture is baked at 1,100 - 1,350°C, reduced at 900 - 1,200°C and ground and excited.
PCT/KR2000/000543 1999-05-29 2000-05-26 A zinc silicate based green fluorescent material WO2000073400A1 (en)

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JP2005350657A (en) * 2004-05-11 2005-12-22 Matsushita Electric Ind Co Ltd Phosphor and plasma display panel using the phosphor
CN101944402A (en) * 2009-07-01 2011-01-12 三星康宁精密素材株式会社 The Zinc oxide-base conductor
CN102933684A (en) * 2010-06-30 2013-02-13 海洋王照明科技股份有限公司 Zinc manganese silicate containing metal particles luminescent materials and preparation methods thereof
JP2013512286A (en) * 2009-11-28 2013-04-11 オーシャンズ キング ライティング サイエンスアンドテクノロジー カンパニー リミテッド Silicate luminescent material and method for producing the same

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US8980131B2 (en) 2009-11-28 2015-03-17 Ocean's King Lighting Science & Technology Co., Ltd. Silicate luminescent material and its preparation method
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