TW201222884A - Manufacturing method of wavelength conversion component, wavelength conversion component and light source - Google Patents

Abstract

Provided is a manufacturing method of a wavelength conversion component, it could easily manufacture a high strength wavelength conversion component. By heating stretching a sintered perform (30) of an inorganic fluorescence powder and a glass powder to form a wavelength conversion component (10).

Description

201222884 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method for manufacturing a wavelength in which a fluorescent material is dispersed in a glass base material, and a method for manufacturing an inorganic fluorescent member dispersed in a glass base material The wavelength k-changing member produced by the method and the light source having the wavelength converting member. [Prior Art] Development of a white light source used for applications such as backlights of liquid crystal displays in recent years;}: The purpose is prevailing. For example, a light source disclosed in Patent Document 1 below is a light-emitting diode of a light-emitting diode that emits blue light, and a wavelength conversion member that absorbs a portion of the wavelength-receiving member. The aforementioned blue light emits yellow light. This light source emits white light by the combination of blue light and yellow light. In the wavelength conversion member, an inorganic phosphor powder is dispersed in a resin matrix. However, the wavelength conversion member in which the inorganic phosphor powder is dispersed in the resin matrix causes deterioration of the resin due to the light of the LED, and the 72-degree white light source easily has a problem of decreasing with time. In particular, when the light derived from LED is light having a short wavelength and high energy such as blue light, the resin is easily deteriorated. There are various problems, for example, in the following Patent Documents 2 and 3, a wavelength conversion member in which inorganic phosphor powder is dispersed in glass is proposed. The wavelength conversion member described in Patent Documents 2 and 3 does not contain a resin and is composed only of an inorganic solid. Therefore, it has excellent heat resistance and weather resistance. Therefore, a white light source whose luminance is not easily lowered can be realized by using the wavelength conversion member. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. [Patent Document 4] Japanese Laid-Open Patent Publication No. 2007-182529 (Explanation of the Invention) However, the wavelength conversion member using glass as a dispersion medium is different from the wavelength conversion member using a resin as a dispersion medium. Difficult to form problems. In particular, it is difficult to form a wavelength conversion member using glass as a dispersion medium into a plate shape. For example, in the above-mentioned Patent Document 4, a method of manufacturing a wavelength conversion member is proposed in which a glass powder and an inorganic phosphor powder paste are produced as a green sheet, and are produced by firing the green sheet. A plate-shaped wavelength conversion member. However, the method for manufacturing a wavelength conversion member described in Patent Document 4 has a problem that it is difficult to manufacture a wavelength conversion member of a strong intensity. The present invention has been made in view of the related problems, and an object thereof is to provide a method of manufacturing a wavelength converting member which can easily manufacture a high-intensity wavelength converting member. (Means for Solving the Problem) As a result of careful study by the inventors of the present invention, it has been found that the strength of the sintered body of 4 323297 201222884 can be improved by heating and extending the preform of the inorganic phosphor powder and the glass powder. this invention. That is, the manufacturing method of the wavelength converting member of the present invention is formed into a wavelength converting member by heating and extending the sintered body preform of the inorganic phosphor powder and the glass powder. Therefore, the high-intensity wavelength conversion member 0 can be easily manufactured. In the present invention, the heating extension of the sintered body preform is above the softening point of the glass powder, preferably at a temperature higher than the softening point of the glass powder by 2 〇〇 c or less. The temperature is carried out. At this time, the heating extension of the sintered body preform can be suitably performed. In addition, higher intensity wavelength conversion members can be fabricated. Further, when the content of the inorganic phosphor in the sintered body preform is large, for example, at 5% by mass or more, particularly 8% by mass or more, at a temperature higher than the softening point of the glass powder, ioo ° C, especially higher than the glass powder. The softening point temperature 15 (high temperature above rc is preferably extended by heating. In the present invention, it is preferred to form a molded body containing an inorganic phosphor and a glass powder and containing no binder) and in a reduced pressure environment. The molded body is fired and formed into a sintered body. In this case, the voids in the sintered body preform can be reduced. Therefore, it is possible to produce a wavelength conversion member of the present invention having a higher intensity. The sintered body preform of the surface powder and the glass frit is formed by heat extension molding. As described above, the sintered body can be increased by the addition of the extrusion molding, so that the wavelength conversion member of the present invention has high strength. The wavelength conversion member of the invention may be in the form of a plate or a rod, for example, in particular, for example, ^ 323297 5 201222884 The thickness dimension ratio is the wavelength conversion of the invention. Further, in the present invention, the "plate shape" includes "sheet shape" and "film shape". The wavelength conversion member of the present invention has a length on the surface of the wavelength conversion member. The linear groove of 30_ or more and the deep G. heart m or more is more than 100 pieces of the linear groove of 0·25_2, more preferably 5 or less, and more preferably 2. It is more preferable that the second is not substantially present. In this case, it is not easy to produce (4) cracks in the linear groove on the surface of the recording member caused by external Lili (Cai (8), and it is less likely to occur. The problem of cracking and strength reduction. In addition, the scattering loss due to the linear groove is reduced. Therefore, the loss of the surface of the wavelength conversion member is reduced, and the efficiency of taking out light to the outside is improved. A wavelength conversion member having a high luminous intensity' and inconsistency in color reproducibility and luminous intensity. The length of the linear groove can be determined, for example, by observing an image of the surface of the wavelength conversion member using a scanning electron microscope (s EM ). Further, the depth of the linear groove can be measured using a stylus type surface roughness meter. Here, the linear groove depth means the distance from the average line to the tip end of the linear groove in the measurement curve of the surface shape of the member. The medium inorganic phosphor powder can be suitably selected in accordance with the desired excitation light, converted light, etc. The inorganic phosphor powder is, for example, selected from the group consisting of an oxide inorganic phosphor, a nitride inorganic phosphor, and an oxynitride inorganic fluorescent material. Body, sulfide inorganic phosphor, oxysulfide inorganic phosphor, rare earth metal sulfide inorganic phosphor, chemical salt inorganic phosphor, and halogen phosphate 6 323297 201222884 : · Inorganic phosphor The rotary light source includes: the wavelength (four) member-inducing light-emitting element of the present invention, wherein the light-emitting element emits a wavelength conversion structure to the wavelength conversion member; and excitation light of the cow. As described above, the wavelength conversion member of the present invention and therefore, the light source of the present invention has high mechanical durability. Further, the light-emitting element of the present invention is not particularly limited, and can be constituted, for example, by (10). By using LEDs, it is possible to achieve long product life and low power consumption. The light source of the present invention can be any light that emits any hue. The light source of the present invention includes, for example, a light-emitting element that emits blue light, and a wavelength conversion member that absorbs blue light from the coffee and emits yellow light, and emits white light by combining blue light and yellow light. Further, the light source of the present invention may be provided with a plurality of light emitting elements. Further, in the present invention, the "blue quotient θ , t . , _ 疋 疋 # daily wavelength region is light of 44 〇 nm to 48 〇 nm. "White light" refers to light having a chromaticity X of 0.25 to 〇 45 and a color y of 0.25 to 0.45. In particular, it is preferably light that is close to the black body. (Effect of the Invention) A method of manufacturing a wavelength (four) member can be provided according to the present invention. [Embodiment] The factory Λ light source 1 is exemplified by the implementation of the present invention. The wavelength conversion member included in the source of the present invention and the wavelength conversion light source 1 is a schematic side view of the present invention. As shown in Fig. 1 of 323297 7 201222884, the light source 1 has a wavelength converting member 10 and a plurality of light emitting elements 20. The light source 1 absorbs a part of the excitation light 20a emitted from the light-emitting element 20 by the wavelength conversion member 10, and simultaneously emits the fluorescent light 10a by the wavelength conversion member 1. On the other hand, the excitation light 20a is partially absorbed by the wavelength conversion member 10 and directly transmitted, and the combined light 2 (e.g., white light) of the excitation light 20a and the fluorescent light 10a is emitted. The light-emitting element 20 is not particularly limited, and can be formed, for example, by an LED, a plasma light-emitting element, an electroluminescence light-emitting element, or the like. In the present embodiment, the wavelength conversion member 10 is dispersed with inorganic fluorescent light in the glass. Made of body powder. The inorganic phosphor powder can be suitably selected in accordance with the wavelength " of the synthesized light 2 emitted from the light source 1 and the wavelength of the excitation light 20a emitted from the light-emitting element 20, and the like. The inorganic phosphor powder may be, for example, selected from the group consisting of an oxide inorganic phosphor, a nitride inorganic phosphor, an oxynitride inorganic phosphor, a sulfide inorganic phosphor, an oxysulfide inorganic phosphor, a rare earth metal sulfide. One or more of an inorganic phosphor, an aluminate inorganic phosphor, and a dentate phosphate inorganic phosphor. The inorganic phosphor powder which emits blue light when irradiated with ultraviolet light having a wavelength of from 300 nm to 440 nm to near-ultraviolet light can be exemplified.

Sr5(P〇4)3Cl : Eu2+> (Sr, Ba)MgAli〇Oi7 : Eu2+' (Sr, Ba)3MgSi2〇8 : Eu2+ or the like. 323297 201222884 inorganic phosphor powder which emits green fluorescence (fluorescence with a wavelength of 500 nm to 540 nm) when irradiated with excitation light having a wavelength of from 3 Å to 440 nm to near-ultraviolet light can be exemplified by SrAl 2 〇 4 : Eu 2+ , SrGa2S4 : Eu2+ , SrBaSi〇4 : Eu2+ , CdS : In, CaS : Ce3+, Y3(A1, Gd)5〇12 : Ce2+, Ca3Sc2Si3〇12: Ce3+, SrSiOn: Eu2+, ZnS:Al3+, Cu+, CaS: Sn2+ CaS : Sn2+, F ' CaS〇4:Ce3+, Mn2+ ' L1AIO2 : Mn2+ > BaMgAhoOn : Eu2+, Mn2+, ZnS:Cu+, Cl-, Ca3W〇6 : U, Ca3Si〇4Cl2 : Eu2+, Sro.2Bao.7Ch .1Al2O3.45 : Ce3+, Mn2+' Ba2MgSi2〇7 : Eu2+ > Ba2Si〇4 : Eu2+, Ba2Li2Si2〇7: Eu2+, ZnO: S, ZnO: Zn, Ca2Ba3(P〇4)3Cl : Eu2+, BaAl2〇4 : Eu2+ and so on. The inorganic phosphor powder which emits green fluorescence (the glory of a wavelength of 500 nm to 540 nm) when irradiated with blue excitation light having a wavelength of 440 nm to 480 nm may be SrAl2〇4: Eu2+, SrGa2S4: Eu2+, SrBaSi〇4: Eu2+, CdS: In, CaS: Ce3+, Y3(A1, Gd)5〇12: Ce2+, Ca3Sc2Si3〇12: Ce3+, SrSiOn: Eu2+, and the like. The inorganic phosphor powder which emits yellow fluorescence (fluorescence of a wavelength of 540 nm to 595 nm) when irradiated with excitation light having a wavelength of from 300 nm to 440 nm to near-ultraviolet light may be exemplified by ZnS: Eu2+, Ba5 (P〇4). 3Cl : U, SnW〇6 : U, CaGa2S4 : Eu2+, SrS〇4 : Eu2+, Mn2+, ZnS: P, ZnS: P3_, Cr, ZnS: Mn2+. The inorganic phosphor powder which emits yellow fluorescence (fluorescence of a wavelength of 540 nm to 595 nm) when irradiated with blue excitation light having a wavelength of 440 nm to 480 nm can be exemplified by Y3(Al, Gd)5〇12: Ce2+, Ba5. (P〇4) 3Cl : U, CaGa2S4 : Eu2+, SnSi〇4 : Eu2+, and the like. 9 323297 201222884 Inorganic phosphor powder which emits red fluorescence (fluorescence with a wavelength of 600 nm to 700 nm) when irradiated with ultraviolet light of a wavelength of 300 nm to 440 nm to excitation light of near-ultraviolet light can be exemplified by CaS: Yb2+, C1, Gd3Ga4 〇12 : Cr3+,

CaGa2S4: Mn2+, Na(Mg, Mn)2LiSi4〇i〇F2: Mn, ZnS: Sn2+, Y3AI5O12: Cr3+, SrB8〇13: Sm2+, MgSr3Si2〇8: Eu2+, Mn2+, a-SrO · 3B2〇3 : Sm2+, ZnS-CdS, ZnSe: Cu+, Cl, ZnGa2S4: Mn2+, ZnO: Bi3+, BaS: Au, K, ZnS: Pb2+, ZnS: Sn2+, Li+, ZnS: Pb, Cu, CaTi〇3: Pr3+, CaTi〇3: Eu3+, Y2〇3: Eu3+, (Y, Gd)2〇3: Eu3+, CaS: Pb2+, Mn2+, YP〇4: Eu3+, Ca2MgSi2〇7: Eu2+, Mn2+, Y(P, V)〇4 : Eu3+, Y2〇2S : Eu3+, SrAia : Eu3+, CaYAlCU : Eu3+, La〇2S :

Eu3+ > LiW2〇8 : Eu3+, Sm3+ > (Sr, Ca, Ba? Mg)i〇(P〇4)6 Ch : Eu2+, Mn2+, Ba3MgSi2〇8 : Eu2+, Mn2+, and the like. The inorganic phosphor powder which emits red fluorescence (fluorescence of a wavelength of 600 nm to 700 nm) when irradiated with blue excitation light having a wavelength of 440 nm to 480 nm can be exemplified by ZnS: Mn2+, Te2+, Mg2Ti〇4: Mn4+, K2SiF6. : Mn4+, SrS: Eu2+, CaS: Eu2+, UuEumTiShO",

Nai.23K〇.42Eu〇.i2TiSi5〇i3 : Eu3+' CdS : In, Te ' CaAlSiNa : Euz+ >

CaSiN3 : Eu2+, (Ca, Sr) 2SisN8 : Eu2+, EU2W2O7, and the like. In order to make the excitation light coincide with the wavelength region of the luminescence, a plurality of inorganic fluorescing powders may be mixed and used. For example, when white light is obtained by excitation light irradiation in an ultraviolet light region, it is sufficient to use a mixture of inorganic phosphor powders emitting blue, green, and red. The light-emitting element 20 uses an LED that emits blue light, and by using a wavelength conversion member 1 that emits yellow light by absorbing blue light, for example, a white light source useful as a light source of a liquid crystal display can be realized. The glass as the dispersion medium is not particularly limited as long as it can maintain the inorganic phosphor powder stabilizer 323297 10 201222884. Specific examples of the glass which can be used as the dispersion medium include, for example, citrate glass, borate glass, and Si〇2-B2〇3-R bismuth glass (R represents at least Mg, Ca, Sr, and Ba). One type is a borosilicate-based glass, a phosphate-based glass such as a SnO-PzOs-based glass, or a borophosphate-based glass. Among them, Si〇2-B2〇3-R lanthanum glass and sn〇-P2〇5 series glass are preferably used. The S1 〇2_B2〇3-R lanthanum glass may be, for example, a glass having the following composition of mole %. Si〇2 is 30 to 80%, B2〇3 is 1 to 30%, MgO is 〇 to 1 〇%, and CaO is 〇 to 30%, SrO is 〇 to 20%, BaO is 〇 to 40%, MgO+CaO+SrO+BaO is 5 to 45%, Al2〇3 is 0 to 10%, and ZnO is 0 to 10%.

In addition to the above-mentioned components, the Si〇2-B2〇HRO-based glass may contain a metal oxide such as Li2〇, Naz〇, or LO, etc., such that the glass softening point is lowered, the composition can be fired at a low temperature, and the glaze is melted. Sex components, Ta2〇5, Ti〇2, NbA, Gd2〇3, La2〇3, etc., which enhance the chemical durability of the glass. The SnO-PAs-based glass may be, for example, a glass having the following composition:

SnO is 35 to 80%, P2〇5 is 5 to 40%, B2O3 is 〇 to 30%, Al2〇3 is 〇 to 10%, si〇4 〇 to just, Li2〇 is 〇 to 1〇%, Na2〇 It is 10%, Κ2〇 is 0 to 10%, 〇 is 〇 to i〇%, Ca〇 is 〇 to 10%, SrO is 0 to 10%, and BaO is 〇 to ι〇〇/.

In addition to the above components, the Sn〇-P2〇5-based glass may contain a component such as Ta2〇s, Ti〇2, Nh〇5, Gd—, La^, etc., which enhances the weather resistance of the glass, and ZnO or the like stabilizes the glass. Ingredients, etc. From the viewpoint of lowering the softening point of SnO-P2〇s glass and making the glass stable, 11 323297 201222884 point 'The molar ratio of SnO to PA (Sn〇/P2〇5) is preferably in the range of 〇9 to 摩色, More preferably in the range of 1.5 to 1 ,, and even more preferably in the range of 2 to $. If the molar ratio (_/p2〇〇 is too small, the low-temperature firing will cause the inorganic phosphor powder to be easily deteriorated when the inorganic phosphor powder is fired. In addition, if the molar ratio is too small, P2〇5) is too small to make the weather resistance. Too much lower. On the other hand, if Mohr (, 0/:SnO/Ρζ〇5) is too large, the glass tends to lose transparency, and the content of the inorganic phosphor powder in the glass-wavelength wavelength conversion member 10 is limited. 'For example, it is preferably from % by mass to 3 % by mass, from 5% by mass to 25 mass%/0, particularly preferably from 1% by mass to 20% by mass. *1 The shape of the wavelength conversion member 1A is not particularly limited. The wavelength conversion 1 〇 can be, for example, a plate shape or a rod shape. In this embodiment, the wavelength conversion member is exemplified by a plate shape having a length dimension and a thickness dimension.

Referring to Fig. 2 and Fig. 3, mainly, the wavelength conversion member 1 which is separated from the present embodiment will be described. Manufacturing method. L First, a molded body containing a binder containing an inorganic phosphor powder and a glass powder and containing no binder is prepared. Specifically, the molded body can be produced by, for example, press-molding a mixed powder of an inorganic phosphor powder and a glass powder using a mold. And the average particle diameter D50 of the inorganic glaze powder is preferably lem to 50 y m, more than a ς ς ^ 广 马 b / " m to 25 / ζ πι. If the average D5G of the inorganic phosphor powder is too small, the luminous intensity tends to decrease. On the other hand, when the average particle diameter _ of the right inorganic phosphor powder is too large, the uniformity of the luminescent color tends to decrease. Further, the average particle diameter D50 of the swill powder is preferably 〇. 丨 to 1 〇〇/Zm', more preferably 1 to 50 #m. When the average particle diameter D5 of the glass powder is too small, bubbles are likely to be generated during firing. Therefore, the strength of the obtained wavelength conversion member 10 is lowered. On the other hand, when the average particle diameter D50 of the glass powder is too large, it is difficult to uniformly disperse the inorganic phosphor powder, and as a result, the luminous efficiency of the wavelength conversion member 10 is lowered. In the present specification, the average particle diameter D50 is a value measured by using SALD200J manufactured by Shimadzu Corporation according to JIS_R1629. Then, the produced molded body is fired in a reduced pressure atmosphere to form a sintered body preform 3 shown in Fig. 2 . In the case where the pressure in the environment in the firing step is, for example, less than 1 atmosphere, the bubbles are less likely to remain in the sintered body preform, which is preferable. The maximum firing temperature can be, for example, from the softening point of the glass powder to the softening point + 1001. Further, in the present embodiment, since the wavelength conversion member 10 has a plate shape, it is preferable that the sintered body preform 30 has a plate shape, a rectangular parallelepiped shape, and a rectangular parallelepiped shape. Next, the sintered body preform obtained by heating is formed into a wavelength conversion member 10. Specifically, as shown in Fig. 3, the sintered body preform 30 is heated by the heater 31 to be softened, and the end portion of the sintered body preform 3 is stretched by the light 32. Thereby, the softened sintered body preform 30 is extended to be formed into a wavelength converting member 丨〇. The heating extension of the sintered body preform 30 is carried out at a temperature higher than the softening point of the glass powder, preferably at a temperature higher than the softening point temperature of the glass powder by 200 °C or lower. 13 323 297 201222884 The ratio (1) (10) of the thickness t1 of the sintered body preform 30 after stretching to the thickness to before stretching is not particularly limited, and may be, for example, about 5 to 5 Torr. As described above, in the present embodiment, the wavelength conversion member is formed by twisting the green body 30, and thus the surface intensity of the wavelength conversion member 1Q can be easily produced. Further, the reason why the high-intensity wavelength conversion member is easily obtained by heating and extending is presumed to be the following reason! To 3. Reason 1: A compressive stress layer (for example, a layer having a compressive stress of about 10 MPa to about 10 MPa) is formed on the surface layer of the wavelength conversion member 1 by heating and stretching. Reason 2: The surface layer of the inorganic phosphor powder reacts with the glass to increase the adhesion strength between the inorganic phosphor powder and the glass. Reason 3: The surface layer was repaired by softening the surface layer of the sintered body preform 3〇. Therefore, the wavelength conversion member 1 manufactured by the wavelength conversion member 10 has a length of 30/zm or more and a depth of 0.05 μm& on the surface of the wavelength conversion member 10, preferably a mother groove. 25 mm2, the average number of the linear grooves It is preferably 50 or less, more preferably 20 or less, and even more preferably 1 or less. 'Specially, there is substantially no linear groove. Further, in the present embodiment, the heating extension of the sintered body preform 3 is performed at a temperature higher than the softening point of the glass powder and at a temperature higher than the softening point temperature of the glass powder by 200 °C or lower. Therefore, the higher-intensity wavelength conversion member 10 can be manufactured. When the heating extension temperature of the sintered body preform 30 is too low, the heating and stretching cannot be appropriately performed, and the strength of the obtained wavelength conversion member 1 降低 is lowered. On the other hand, if the heating extension temperature of the sintered body preform 30 is too high, the wavelength conversion member 10 having the desired shape cannot be obtained. Further, in the present embodiment, the molded body having no binder is formed in a reduced pressure atmosphere, so that the porosity of the sintered body preform can be lowered, and the porosity of the wavelength conversion member 1G can be lowered. Therefore, the wavelength conversion member 1G having higher intensity and high luminous efficiency can be manufactured. Further, the porosity of the sintered body preform 30 and the wavelength converting member 1G is preferably 2% by volume or less, more preferably 1% by volume or less. In the present embodiment, a plate-shaped wavelength conversion member 1 is produced by heating a plate-shaped sintered body preform 30 by heating. However, the shape of each of the sintered body preform 3 and the wavelength converting member 1 is not limited to a plate shape. For example, a rod-shaped wavelength conversion member can be produced by heating a rod-shaped sintered body preform. The present invention will be described in detail below with reference to the preferred embodiments, but the present invention is not limited to the following examples, and modifications may be made without departing from the spirit and scope of the invention. (Example) The following shovel powder and inorganic phosphor powder were mixed in a mass ratio (glass powder/inorganic phosphor powder) of 9:1, and a molded body was produced by press molding using a mold. Thereafter, the formed body was fired by the following conditions to produce a wound preform. The composition (mass ratio) of the glassy powder: Si〇2 was 50%, Ba0 was 25%, Ca〇 was 10%, B2〇3 was 5%, 八12〇3 was 5%, and Zn〇 was 5%. The flat grain of the glass powder (D5〇):

Softening point of glassy powder: 850 °C Formation of inorganic phosphor powder: Y3 (Al, Gd) 5〇12 : Ce2+ 15 323297 201222884 Average particle size of inorganic phosphor powder (D50) : 2〇#m The highest temperature of the firing: 850 ° C. Environment at the time of firing: Ambient pressure at the time of air firing: 100 Pa Next, the obtained sintered body was cut into a rectangular parallelepiped shape having a width of 15 mm, a thickness of 45 mm, and a length of 100 nm to prepare a base material. Next, this base material was placed in an extension molding machine, and transferred to a forming furnace maintained at 1 〇 2 〇艽 (softening point + 170 C) at a transport speed of limn/min, and the outlet of the forming furnace was pulled out at a speed of 225 mm/min. By cutting the drawn molded body by an automatic cutter, a rectangular length-changing member having a width of 1 mm, a thickness of 0.3 coffee, and a length of 300 mm can be produced. When it is confirmed that the wavelength conversion member is irradiated with light of a blue LED (light emission wavelength: 460 nm), white light is emitted. The three-point bending strength of the wavelength conversion member obtained in the present example is 250 MPa in accordance with JIS-R16 (H' measured by Aut〇Graph AG_1〇kNIS manufactured by Shimadzu Corporation). (Comparative Example) Production was carried out in the above-described examples. The glass powder and the inorganic phosphor powder are a glass paste having a mass ratio of 9: 1. The glass paste is applied onto the PET film to prepare a green sheet. Thereafter, the green sheet is used in the same manner as the above embodiment. A wavelength conversion member having the same dimensions as those of the above-described examples was produced by firing in the same firing conditions. The three-point bending strength of the obtained wavelength conversion member was measured in the same manner as in the above Example, and its value was 13 MPa. From the above results, it is understood that a high-strength wavelength conversion member can be produced by heating and stretching the sintered body preform. 16 323 297 201222884. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side view of a light source according to an embodiment of the present invention. Fig. 2 is a schematic perspective view of a sintered body preform. Fig. 3 is a schematic side view for explaining a heating extension step. [Main component symbol description] 1 Light source 2 Fluorescent light-emitting element 10a 20 10 20a excitation light wavelength conversion member 30 sintered preform 31 roller heater 32 to a thickness of the preformed sintered body after the sintered body extends in front of the thickness tl extends preformed 17323297

Claims (1)

201222884 VII. The scope of the patent application: 1. A method for producing a wavelength conversion member, which is formed by converting a sintered body preform of an inorganic phosphor powder and a glass powder into a wavelength conversion member. 2. The method for producing a wavelength conversion member according to claim 1, wherein the heating extension of the sintered body preform is equal to or greater than a softening point of the glass powder but equal to or less than a softening point of the glass powder. It is carried out at a temperature of 200X: high. 3. The method for producing a wavelength conversion member according to claim 1 or 2, wherein a molded article containing the inorganic phosphor and the glass powder but not containing a binder is formed, and the molded article is reduced. The sintered body preform is formed by firing in a pressure environment. A wavelength conversion member obtained by heating and stretching a sintered body preform of an inorganic phosphor powder and a glass powder. 5. The wavelength conversion member according to claim 4, wherein the wavelength conversion member has a plate shape or a rod shape. 6. The wavelength conversion member according to claim 5, wherein the wavelength conversion member is a plate having a ratio of length dimension to thickness dimension of (10):1 or more. The wavelength conversion member of the invention of claim 4, wherein the inorganic phosphor powder is selected from the group consisting of an oxide inorganic phosphor, a nitride inorganic phosphor, Oxynitride inorganic phosphor, sulfide inorganic phosphor, oxysulfide inorganic phosphor, rare earth metal sulfide inorganic phosphor, acid salt inorganic phosphor, and dentate acid filling 1 323297 201222884 One or more substances of a salted inorganic phosphor. 8. The wavelength conversion member according to any one of claims 4 to 7, wherein on the surface of the wavelength conversion member, an average number of 100 or less is 30 μm in an area of 0.25 mm 2 . a linear groove of m or more and a depth of 0.05 / z in or more. A light source, comprising: a wavelength conversion member according to any one of items 4 to 8; and a light-emitting element that emits excitation light of the wavelength conversion member to the wavelength conversion member . 10. The light source of claim 9, wherein the illuminating element is an LED. The light source according to claim 9 or 10, wherein the light-emitting element emits blue light, the wavelength conversion member absorbs a part of the blue light to emit yellow light, and the blue light and the yellow color are The synthesis of light produces white light. 12. The light source according to any one of claims 9 to 11, comprising a plurality of the light-emitting elements. 2 323297