JP2007023267A - Emission color-converting material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a material for emission color-converting members, causing no phosphor properties deterioration under baking despite containing low heat-resistant phosphor. <P>SOLUTION: The material is such as to be intended for making emission color-converting members that emit fluorescence in the visible light region of 380-780 nm on being irradiated with rays having emission peaks in the range of wavelengths 250-500 nm. This material comprises SiO<SB>2</SB>-B<SB>2</SB>O<SB>3</SB>-RO( RO is at least one selected from MgO, CaO, SrO and BaO )-based glass powder and at least one inorganic phosphor powder selected from of sulfide, oxysulfide, halide and aluminate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light emission color conversion material for producing a light emission color conversion member that converts the wavelength of light emitted from a light emitting diode (LED) or the like into another wavelength.

  In an LED element that performs wavelength conversion using a phosphor, for example, a phosphor powder is mixed and molded into an organic binder resin or the like (mold resin) that seals the light emitting surface of the LED chip, and a part of light emission of the LED chip or All are absorbed and converted to the desired wavelength.

However, there is a problem that the mold resin constituting the LED element deteriorates due to heat generation of the LED chip or irradiation with high-output short wavelength (blue to ultraviolet) light, causing discoloration and the like. Therefore, it has been proposed to fix phosphor powder with glass instead of resin. (For example, Patent Document 1)
JP 2003-258308 A

  The luminescent color conversion member disclosed in Patent Document 1 is produced by firing a mixed powder of a glass powder having a high softening point and a phosphor powder. The conversion member produced in this way has a feature that glass as a base material is not deteriorated by heat or irradiation light.

  However, although the luminescent color conversion member can be produced without any problem as long as it is a phosphor having high heat resistance such as YAG phosphor, phosphor having low heat resistance, such as sulfide phosphor, oxysulfide phosphor, and halide. In the case of the phosphor and the aluminate phosphor, the phosphor may be deteriorated during firing.

  An object of the present invention is to provide a material for producing a light emitting color conversion member that does not deteriorate the characteristics of the phosphor during firing, even though it contains a phosphor having low heat resistance.

  As a result of various experiments, the present inventors have found that, if a glass having a specific composition system is used, even if a phosphor having low heat resistance is used, its characteristics are hardly deteriorated. As proposed.

That is, the luminescent color conversion material of the present invention is a material for producing a luminescent color conversion member that emits fluorescence in the visible light range of 380 nm to 780 nm when irradiated with light having an emission peak in the wavelength range of 250 nm to 500 nm. SiO ₂ —B ₂ O ₃ —RO (RO is one or more selected from MgO, CaO, SrO and BaO) glass powder, and 1 selected from sulfide, oxysulfide, halide and aluminate. It consists of inorganic phosphor powder of more than seeds.

  The mixing ratio of the glass powder and the inorganic phosphor powder is preferably in the range of 99.99: 0.01 to 70:30 by mass ratio.

Glass powder is 30% by weight of SiO ₂ , 1% to 15% of B ₂ O ₃ , 10% to 45% of RO, 0% to 10% of MgO, 0% to 25% of CaO, 0% to 10% of SrO, BaO 8. It is preferably made of glass containing ˜40%, Al ₂ O ₃ 0-20%, ZnO 0-10%.

  Furthermore, the luminescent color conversion material of the present invention is preferably provided in the form of a green sheet or paste.

  Moreover, the luminescent color conversion member of the present invention is obtained by firing the above material.

  If the material of the present invention is used, emission color conversion can be performed without degrading the characteristics of phosphors having low heat resistance (sulfide phosphors, oxysulfide phosphors, halide phosphors or aluminate phosphors). A member can be produced. Therefore, the degree of freedom in designing the conversion member can be expanded. And since the glass which becomes a base material is stable with respect to a heat | fever or irradiation light, the conversion member obtained does not change color and can produce a highly reliable and long-life LED element.

  Moreover, by using it in the form of a green sheet or paste, it is possible to produce a light emitting color conversion member having a thin wall thickness and having phosphors dispersed uniformly. This luminescent color conversion member can efficiently convert light energy emitted from the LED. The energy conversion efficiency referred to in the present invention means that the energy of the light source is a (W: Watt), the energy of light having the same wavelength as that of the light source transmitted through the phosphor composite glass is b (W), and in the phosphor composite glass. When the energy of light converted by the wavelength of the light source is c (W), it is a value represented by c / (ab) × 100 (%).

  The luminescent color conversion material of the present invention is a material for producing a luminescent color conversion member that emits fluorescence in the visible light range of 380 nm to 780 nm when irradiated with light having an emission peak in a wavelength range of 250 nm to 500 nm. In other words, it is a material for producing a member that absorbs at least part of it and converts it into fluorescence in the visible range when irradiated with ultraviolet (250 to 400 nm) or blue (400 to 500 nm) excitation light. The luminescent color conversion member referred to in the present invention is not particularly limited as long as it is a sintered body of glass powder and phosphor powder, and has a specific shape such as a plate shape, a columnar shape, a hemispherical shape, etc. It includes not only members but also films formed on the substrate surface.

  The luminescent color conversion material of the present invention comprises a specific glass powder and a phosphor powder.

The glass powder has a role as a medium for stably holding the inorganic phosphor, and in the present invention, SiO ₂ —B ₂ O ₃ —RO (RO is one or more selected from MgO, CaO, SrO and BaO). A glass having a composition of the system is used. This type of glass is characterized by low reactivity due to its high softening point and difficulty in reacting with inorganic phosphors during firing. In addition, when this type of glass is used, there is a feature that the phosphor is not easily deteriorated even if it is baked at a temperature higher than the heat resistant temperature of the phosphor. It should be noted that SiO ₂ glass other than SiO ₂ —B ₂ O ₃ —RO glass, for example, SiO ₂ —B ₂ O ₃ —R ₂ O (R ₂ O represents Li ₂ O, Na ₂ O, K ₂ O). There is a possibility that a composition having the same effect may exist in the glass based, SiO ₂ —B ₂ O ₃ —Al ₂ O ₃ based glass, and SiO ₂ —B ₂ O ₃ —ZnO based glass.

A preferable composition range of the SiO ₂ —B ₂ O ₃ —RO-based glass is, by mass percentage, SiO ₂ 30 to 70%, B ₂ O ₃ 1 to 15%, MgO 0 to 10%, CaO 0 to 25%, SrO. 0~10%, BaO 8~40%, RO 10~45%, Al 2 O 3 0~20%, a 0% ZnO. The reason for determining the above range is as follows.

SiO ₂ is a component that forms a network of glass. When the content is less than 30% by mass, chemical durability tends to deteriorate. On the other hand, if it exceeds 70% by mass, the sintering temperature becomes high and the phosphor tends to deteriorate. A more preferable range of SiO ₂ is 40 to 60%.

B ₂ O ₃ is a component that significantly improves the meltability by lowering the melting temperature of the glass. When the content is less than 1% by mass, it is difficult to obtain the effect. On the other hand, when it exceeds 15 mass%, chemical durability tends to deteriorate. A more preferable range of B ₂ O ₃ is 2 to 10%.

  MgO is a component that improves the meltability by lowering the melting temperature of the glass. When the content is more than 10% by mass, chemical durability tends to deteriorate. A more preferable range of MgO is 0 to 5%.

  CaO is a component that improves the meltability by lowering the melting temperature of the glass. When the content exceeds 25% by mass, chemical durability tends to deteriorate. A more preferable range of CaO is 3 to 20%.

  SrO is a component that improves the meltability by lowering the melting temperature of the glass. When the content is more than 10% by mass, chemical durability tends to deteriorate. A more preferable range of SrO is 0 to 5%.

  BaO is a component that improves the meltability by lowering the melting temperature of the glass and suppresses the reaction with the phosphor. When the content is less than 8% by mass, the reaction suppression effect with the phosphor tends to be reduced. On the other hand, when it exceeds 40 mass%, chemical durability tends to deteriorate. A more preferable range of BaO is 10 to 35%.

  In addition, in order to improve the meltability of glass without deteriorating chemical durability, it is preferable to make RO which is the total amount of MgO, CaO, SrO and BaO 10 to 45%. When the RO content is less than 10% by mass, it is difficult to obtain the effect of improving the meltability. On the other hand, when it exceeds 45 mass%, chemical durability tends to deteriorate. A more preferable range of RO is 11 to 40%.

Al ₂ O ₃ is a component that improves chemical durability. When the content exceeds 20% by mass, the meltability of the glass tends to deteriorate. A more preferable range of Al ₂ O ₃ is 2 to 15%.

  ZnO is a component that improves the meltability by lowering the melting temperature of the glass. When the content is more than 10% by mass, chemical durability tends to deteriorate. A more preferable range of ZnO is 1 to 7%.

In addition to the above components, various components can be added as long as the gist of the present invention is not impaired. For example, an alkali metal oxide, P ₂ O ₅ , La ₂ O ₃ or the like may be added.

As the inorganic phosphor powder, one or more of a sulfide phosphor, an oxysulfide phosphor, a halide phosphor and an aluminate phosphor which are phosphors having low heat resistance are used. Examples of the sulfide phosphor include ZnS: Cu ⁺ , Al ³⁺ , SrS: Eu ^{2+ and the} like. Examples of the oxysulfide phosphor include Y ₂ O ₂ S: Eu ³⁺ . Examples of the halide phosphor include M ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (M is Sr, Ca, Ba or Mg). Examples of the aluminate phosphor include BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ , SrAl ₂ O ₄ : Eu ^{2+ and the} like. Many of these phosphors have low chemical durability, and are deteriorated by moisture, heat, and light when used alone for a long time. Therefore, it is usually used in a vacuum or a rare gas. However, when the sintered body is made of glass powder, the phosphor is not directly exposed to the atmosphere, and deterioration due to the influence from the atmosphere hardly occurs.

  In addition to the phosphor powder, a heat-resistant phosphor such as a YAG phosphor, an oxide phosphor, a nitride phosphor, an oxynitride phosphor or the like may be used in combination.

  Moreover, in this invention, it is preferable that the mixing ratio of glass powder and inorganic fluorescent substance powder exists in the range of 99.99: 0.01-70: 30 by mass ratio. The energy conversion efficiency of the phosphor composite glass varies depending on the type and content of phosphor particles dispersed in the glass and the thickness of the phosphor composite glass. The phosphor content and phosphor composite glass thickness should be adjusted to optimize the energy conversion efficiency. However, if too much phosphor is used, sintering becomes difficult and porosity increases. , Problems arise such that the excitation light is not efficiently irradiated onto the phosphor, and the mechanical strength of the phosphor composite glass tends to decrease. On the other hand, if the amount is too small, it becomes difficult to emit light sufficiently. Therefore, the content ratio of the glass and the phosphor is preferably adjusted in the range of 99.99: 0.01 to 70:30, more preferably 99.95: 0.05, as described above. It is preferable to adjust in the range of ˜80: 20, particularly 99.92: 0.08 to 85:15.

  Further, in order to produce a conversion material with high energy conversion efficiency, it is important that the wall thickness is thin and the phosphor is uniformly dispersed in the member. In order to produce such a member, the material of the present invention may be provided in the form of a green sheet or paste.

  When used in the form of a green sheet, a binder, a plasticizer, a solvent and the like are used together with the glass powder and the inorganic phosphor powder.

As mentioned above, as the glass powder, SiO ₂ —B ₂ O ₃ —RO-based glass, in particular, SiO ₂ 30 to 70% by mass%, B ₂ O ₃ 1 to 15%, MgO 0 to 10%, CaO 0~25%, SrO 0~10%, BaO 8~40%, RO 10~45%, Al 2 O 3 0~20%, it is preferable to use a glass powder containing 0% ZnO.

  As the inorganic phosphor powder, the above-described sulfide phosphor, oxysulfide phosphor, halide phosphor, aluminate phosphor and the like are used.

  The content ratio of the glass powder and the phosphor powder may be appropriately adjusted according to the type and content of the phosphor powder and the thickness of the phosphor composite glass, but in any case, the mass ratio is 99.99: 0. It is preferable to adjust within the range of 0.01 to 70:30.

  The proportion of the glass powder and inorganic phosphor powder in the green sheet is generally about 50 to 80% by mass.

  The binder is a component that increases the film strength after drying and imparts flexibility, and the content thereof is generally about 0.1 to 30% by mass. As the binder, for example, polyvinyl butyral resin, methacrylic resin and the like can be used, and these can be used alone or in combination.

  The plasticizer is a component that controls the drying speed and imparts flexibility to the dry film, and the content thereof is generally about 0 to 10% by mass. As the plasticizer, for example, dibutyl phthalate, butyl benzyl phthalate and the like can be used, and these can be used alone or in combination.

  The solvent is a material for slurrying the material, and its content is generally about 1 to 30% by mass. As the solvent, for example, toluene, methyl ethyl ketone or the like can be used alone or in combination.

  As a method for producing a green sheet, the above glass powder and inorganic phosphor powder are mixed, and a predetermined amount of a binder, a plasticizer, a solvent, and the like are added to the obtained mixture to form a slurry. Next, this slurry is formed into a sheet on a film of polyethylene terephthalate (PET) or the like by a doctor blade method. Subsequently, after forming the sheet, the organic solvent binder is removed by drying to form a green sheet.

  In order to produce a light emitting color conversion member using the material of the present invention formed into a green sheet in this way, the following method can be suitably used.

First, a green sheet produced using the above-described method and a restraining member that does not react at the firing temperature of the green sheet are prepared and cut into desired dimensions. The reason for using the restraining member is to prevent the material from shrinking in the plane direction due to the surface tension of the glass during firing. As the restraining member, a green sheet-like inorganic material or a porous ceramic substrate can be used. When an inorganic material formed into a green sheet is used as the restraining member, the inorganic material is not particularly limited as long as it is a material that does not sinter at the firing temperature of the luminescent color conversion material. For example, Al ₂ O ₃ , MgO, ZrO ₂ , TiO ₂ , BeO, or BN may be used alone or in combination. Moreover, when making an inorganic material into a green sheet, it can obtain by the method similar to the above. Further, when a porous ceramic substrate is used as the restraining member, there is no particular limitation as long as the phosphor composite glass and the porous ceramic are difficult to adhere at the time of firing. For example, SiAl ₂ O ₅ , Al ₂ O ₃ MgO, ZrO ₂ can be used. Further, the cutting of the green sheet and the restraining member may be performed after the laminate is manufactured. If it does in this way, the luminescent color conversion member with a small dimensional change rate before and behind baking can be obtained.

  Next, a constraining member is laminated on both sides or one side of the green sheet, integrated by thermocompression bonding to produce a laminate, and then fired to obtain a sintered body. Firing is preferably performed at 750 to 1000 ° C. When the temperature is lower than 750 ° C., it becomes difficult to obtain a dense sintered body. On the other hand, at a temperature higher than 1000 ° C., the inorganic phosphor deteriorates or glass and the inorganic phosphor react. In addition, when it is desired to obtain a large amount of luminescent color conversion member at a time, it can be obtained by alternately laminating a plurality of green sheets and restraining members, thermocompression bonding, and firing. In addition, if you want to obtain a thicker conversion member, after laminating a plurality of phosphor composite green sheets, laminate the constraining member on both sides or one side of the laminated green sheets, heat press and fire Can be obtained at

  Subsequently, the restraining member is removed. When a green sheet containing an inorganic composition is used as the restraining member, an unsintered inorganic composition remains on the surface of the phosphor composite glass after the firing treatment, but ultrasonic cleaning is performed. Thus, the remaining inorganic composition can be removed.

  In this way, it is possible to produce a light emitting color conversion member that is chemically stable, has a small thickness, has a uniform thickness, and high energy conversion efficiency. Furthermore, the light emitting color conversion member produced using the restraining member can easily have a porosity of 10% or less. If the porosity can be reduced to 10% or less, light scattering does not increase and a sufficient amount of light is transmitted, so that energy conversion efficiency is improved. Moreover, the mechanical strength of the conversion member is also increased. A more preferable range of the porosity is 8% or less. The porosity means a value obtained by (1−actual density / theoretical density) × 100 (%) based on the actual density and the theoretical density measured by the Archimedes method.

  Next, the case where it supplies with the form of a paste is demonstrated.

  When used in the form of a paste, glass powder, inorganic phosphor powder and vehicle are used.

  As the vehicle, for example, one obtained by dissolving ethyl cellulose in terpineol, one obtained by dissolving nitrocellulose with isoamyl acetate, or the like can be used.

  For the preparation of the paste, glass powder, phosphor powder and vehicle are kneaded using a three-roll mill, and uniform dispersion treatment is performed. In addition, although the example which used the three roll mill was given as a preparation method of a paste, it is not restricted to this, The various methods generally used for preparation of glass paste are applicable.

  A method for producing a luminescent color conversion member using the material of the present invention thus pasted will be described below.

  First, the pasted material is applied on a substrate. As the base material, a plate glass or the like suitable for the thermal expansion coefficient of the material of the present invention after sintering is preferably used. As a coating method, for example, a screen printing method can be employed. When the screen printing method is adopted, it is possible to easily form a coating layer having a uniform thickness. The thickness of the coating layer may be appropriately adjusted according to the desired fluorescent color. If a paste is applied after masking, letters and picture patterns that emit fluorescent colors can be formed on the substrate.

  Next, the applied paste material is degreased at a temperature of 300 to 600 ° C., and subsequently fired at 700 to 1000 ° C. In this manner, a film-like luminescent color conversion member can be formed on a substrate such as plate glass. In addition, it is preferable to select the temperature at which the glass powder flows sufficiently as the firing temperature. However, if it exceeds 1000 ° C., the phosphor reacts with the glass and it becomes difficult to obtain a desired emission color, which is not preferable.

When firing the material of the present invention, it is preferable to fire in an atmosphere with little oxygen. Specifically, it is desirable to fire in an inert atmosphere (N ₂ , Ar, etc.) or a reduced pressure atmosphere (less than 1.013 × 10 ⁵ Pa). In other words, phosphors such as sulfide phosphors, oxysulfide phosphors, halide phosphors, and aluminate phosphors are deteriorated by firing mainly due to the reaction with glass. It is considered that one of the causes is that the phosphor is oxidized. Therefore, it is possible to further suppress the deterioration of the phosphor by reducing the amount of oxygen that causes it.

Further, when a reduced pressure atmosphere is selected as the firing atmosphere, bubbles generated when the glass is softened and fused are easily removed. As a result, the obtained luminescent color conversion member also has an effect that the porosity (the proportion of bubbles remaining in the member) tends to be as small as 2% or less. When there are few bubbles contained in a luminescent color conversion member, scattering of light decreases, the transmittance | permeability becomes high and luminous efficiency becomes high, and is preferable. In addition, the preferable atmospheric | air pressure of a pressure-reduced atmosphere is 0.9 * 10 < ⁵ > Pa or less, More preferably, it is 1000 Pa or less, More preferably, it is 200 Pa or less, Especially preferably, it is 0.001-200 Pa.

  Tables 1 to 5 evaluate the change in luminance before and after firing of the luminescent color conversion member produced using the material of the present invention.

  First, the luminescent color conversion member was produced as follows.

Glass materials of various oxides were prepared so as to have a composition containing 50% SiO _2, 5% B ₂ O ₃ , 10% CaO, 25% BaO, 5% Al ₂ O _{3 and} 5% ZnO by mass percentage. After uniform mixing, the mixture was placed in a platinum crucible and melted at 1400 ° C. for 2 hours to obtain a uniform glass. This was pulverized with alumina balls and classified to obtain glass powder having an average particle diameter of 2.5 μm. Next, an inorganic phosphor powder was mixed with the prepared glass powder at a mass ratio as shown in the table below to prepare a mixed powder. Next, the mixture was pressure-molded with a mold to prepare a cylindrical preform with a diameter of 1 cm. For reference, a sample in which a similar cylindrical preform was produced using only phosphor powder was also prepared (Reference Examples a to d).

  Next, the cylindrical preform is heated in an electric furnace (atmosphere) at 900 ° C. for 20 minutes, and UV light (emission peak wavelength 365 nm, 254 nm), near-ultraviolet diode (emission peak wavelength 400 nm), and blue diode (emission light). Relative luminance was measured with a luminance meter (LS-100, manufactured by Minolta Co., Ltd.) by irradiating light having four different wavelengths having a peak wavelength of 460 nm. In the table, “-” indicates that the excitation light does not emit light. The luminance change rate indicates the luminance change rate before and after firing the fluorescent color conversion member, and is represented by (luminance after firing / luminance before firing) × 100 (%).

  As is clear from the table, each sample obtained by sintering the glass powder and the phosphor powder has a larger luminance change rate in the same excitation light than the sintered body of the phosphor powder alone, that is, a decrease in luminance is small. It became.

  Tables 6 and 7 evaluate differences in luminance change rates due to differences in the composition system of the glass powder used.

  First, the luminescent color conversion member was produced as follows.

Contains glass powder (SiO ₂ —B ₂ O ₃ —RO-based glass) prepared in Example 1 and 45% by mass, SiO ₂ 45%, B ₂ O ₃ 25%, Al ₂ O ₃ 25%, and CaO 5%. glass powder _{(SiO 2 -B 2 O 3 -Al} 2 O 3 based glass) was prepared. Next, the prepared glass powder and inorganic phosphor powder (Y ₂ O ₂ S: Eu ³⁺ and ZnS: Cu ⁺ , Al ³⁺ ) were mixed so as to have a mass ratio of 95: 5, respectively. A cylindrical preform was produced in the same manner as in Example 1, and the luminance change rate before and after firing was determined.

As a result, it was confirmed that the material of the present invention using the SiO ₂ —B ₂ O ₃ —RO glass powder has a large luminance change rate.

  A luminescent color conversion member was prepared using the green sheet material of the present invention, and the energy conversion efficiency was evaluated.

  First, a green sheet was produced as follows.

The glass powder (SiO ₂ —B ₂ O ₃ —RO-based glass) prepared in Example 1 and ZnS phosphor powder (average particle size: 8 μm manufactured by Kasei Optonics Co., Ltd.) are used at a mass ratio of 95: 5. It added and mixed and the mixed powder was produced. Next, 30% by mass of methacrylic acid resin as a binder, 3% by mass of dibutyl phthalate as a plasticizer, and 20% by mass of toluene as a solvent are added to the prepared mixed powder 100 and mixed to prepare a slurry. did. Subsequently, the slurry was formed into a sheet on a PET film by a doctor blade method and dried to obtain a green sheet of a light emitting color conversion material having a thickness of 50 μm.

  Next, an inorganic material made into a green sheet was prepared as a restraining member. As the inorganic material, alumina powder (ALM-21 manufactured by Sumitomo Aluminum Co., Ltd., average particle size: 2 μm) is used, and the mixing ratio and method are the same as those for the green sheet made of the light emitting color conversion member forming material. A thickness-constrained green sheet (alumina green sheet) was obtained.

  Subsequently, the conversion material green sheet and the constraining green sheet are cut into a size of 100 × 100 mm, three conversion material green sheets are laminated on the constraining green sheet, and further, the constraining green sheet is laminated thereon, The laminate was integrated by thermocompression bonding, and then fired at 800 ° C. Thereafter, ultrasonic cleaning was performed to remove the unsintered alumina layer remaining on the surface of the obtained sintered body, and a luminescent color conversion member having a size of 100 × 100 mm and a thickness of 120 μm was produced.

  When the emission color conversion member thus obtained was irradiated with ultraviolet light (emission peak wavelength 400 nm) from behind the member, green light of ZnS was obtained. Moreover, when the energy conversion efficiency and the porosity were measured, the energy conversion efficiency was 13% and the porosity was 5%.

  The energy conversion efficiency depends on the energy (a) of the light source, the energy (b) of the light having the same wavelength as that of the light source transmitted through the luminescent color conversion member, and the wavelength of the light source in the luminescent color conversion member using a spectrophotometer. The energy of the converted light was determined by measuring (c) and calculating from c / (ab) × 100 (%).

  The porosity was determined by measuring the measured density and the theoretical density using Archimedes' method, and calculating from (1−measured density / theoretical density) × 100 (%).

The glass powder (SiO ₂ —B ₂ O ₃ —RO-based glass) prepared in Example 1 and ZnS phosphor powder (average particle size: 8 μm manufactured by Kasei Optonics Co., Ltd.) are used at a mass ratio of 95: 5. It added and mixed and the mixed powder was produced. Subsequently, the produced mixed powder was pressure-molded with a mold to produce a button-like molded body having a diameter of 1 cm. This molded body was sintered at 800 ° C. in a pressure of 500 Pa and then processed to obtain a disk-like light emitting color conversion member having a diameter of 8 mm and a thickness of 1 mm.

  When the emission color conversion member thus obtained was irradiated with ultraviolet light (emission peak wavelength 400 nm) from behind the member, green light of ZnS was obtained. Moreover, when the energy conversion efficiency and the porosity were measured, the energy conversion efficiency was 15% and the porosity was 0.3%.

Claims (5)

A material for producing a luminescent color conversion member that emits fluorescence in a visible light range of 380 nm to 780 nm when irradiated with light having an emission peak in a wavelength range of 250 nm to 500 nm, and includes SiO ₂ —B ₂ O ₃ —RO (RO is one or more selected from MgO, CaO, SrO and BaO) and consists of a glass powder and one or more inorganic phosphor powders selected from sulfide, oxysulfide, halide and aluminate. Luminescent color conversion material characterized.   2. The luminescent color conversion material according to claim 1, wherein the mixing ratio of the glass powder and the inorganic phosphor powder is in the range of 99.99: 0.01 to 70:30 by mass ratio. Glass powder is 30% by mass, SiO ₂ 30-70%, B ₂ O ₃ 1-15%, RO 10-45%, MgO 0-10%, CaO 0-25%, SrO 0-10%, BaO 8. _{~40%, Al 2 O 3 0~20} %, light emitting color conversion material according to claim 1 or 2, characterized in that it consists of glass containing 0% ZnO.   The luminescent color conversion material according to any one of claims 1 to 3, which is provided in the form of a green sheet or paste.   A luminescent color conversion member obtained by firing the material according to claim 1.