WO2013176195A1 - 可視領域での発光光の発光強度と演色性とが最適化された蛍光体混合物 - Google Patents
可視領域での発光光の発光強度と演色性とが最適化された蛍光体混合物 Download PDFInfo
- Publication number
- WO2013176195A1 WO2013176195A1 PCT/JP2013/064287 JP2013064287W WO2013176195A1 WO 2013176195 A1 WO2013176195 A1 WO 2013176195A1 JP 2013064287 W JP2013064287 W JP 2013064287W WO 2013176195 A1 WO2013176195 A1 WO 2013176195A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phosphor
- emission
- spectrum
- intensity
- excitation
- Prior art date
Links
Images
Classifications
-
- 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
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
-
- 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
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- 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
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77342—Silicates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
Definitions
- the present invention relates to a phosphor mixture in which the emission intensity and color rendering properties of emitted light in the visible region are optimized.
- a white light emitting diode is known as a light emitting device using a phosphor having a maximum emission peak in the visible region as a visible light emission source.
- a white LED a combination of a semiconductor light emitting device that emits blue light by applying electric energy and a phosphor-containing resin composition in which a yellow light emitting phosphor is dispersed in a resin binder, blue light from a semiconductor light emitting device, A two-color mixture type that obtains white light by mixing yellow light generated by exciting a yellow light-emitting phosphor with blue light is widely used.
- this two-color mixed type white LED has a narrow wavelength range of emitted light compared to sunlight.
- a phosphor mixture containing a semiconductor light emitting device that emits light having a wavelength of 350 to 430 nm by applying electric energy and three types of phosphors, a blue light emitting phosphor, a green light emitting phosphor, and a red light emitting phosphor.
- a phosphor-containing resin composition dispersed in a resin binder such as an epoxy resin or a silicone resin and blue light and green light generated by exciting each phosphor with light from a semiconductor light emitting element
- Development of a white LED of a three-color mixed type in which the wavelength range of emitted light is expanded by mixing three colors of red light are examples of a white LED of a three-color mixed type in which the wavelength range of emitted light is expanded by mixing three colors of red light.
- Patent Document 1 discloses a fluorescent light for a backlight light source of a liquid crystal display, which includes one or more blue light-emitting phosphors, one or more green light-emitting phosphors and one or more red light-emitting phosphors as a three-color mixed type light-emitting device.
- a body composition is described.
- many examples of compounds are described for each of a blue-emitting phosphor, a green-emitting phosphor, and a red-emitting phosphor. This document also describes that these compounds can be used as a mixture. However, there is no description or suggestion regarding a specific mixture combination.
- the phosphor showing the emission of each color used as the visible light source of the three-color mixed type white LED has a high half-width of the maximum emission peak of the emitted light in addition to the high emission intensity.
- the phosphors known so far have high emission intensity, the half-value width of the maximum emission peak of the emitted light is narrow, while the maximum emission peak of the emitted light is Those having a wide half-value width tend to have low emission intensity. Therefore, it is difficult to obtain a sufficiently satisfactory light emission characteristic as a phosphor for constituting a white LED.
- the present inventor studied using a mixture of two or more of the same color phosphors. That is, the present inventor considered adjusting the balance between the emission intensity and the wavelength range of the emitted light by mixing two or more same-color phosphors having a difference in maximum emission peak wavelength within 50 nm. did. As a result, a phosphor having a relatively high emission intensity at the maximum emission peak wavelength and a narrow half width of the maximum emission peak, and an emission intensity at the maximum emission peak wavelength having a relatively wide half width at the maximum emission peak. The present inventors have found that the emission intensity and color rendering properties of the emitted light in the visible region can be optimized when combined with a phosphor having a low light intensity.
- the present invention is a phosphor mixture containing at least two types of phosphors A and B having the maximum emission peak in the visible region, and the wavelength at which the maximum emission peak appears in the emission spectrum of the phosphor A and the phosphor B
- the difference in wavelength at which the maximum emission peak appears in the emission spectrum is within 50 nm, and the emission intensity of the maximum peak of phosphor A is lower than the emission intensity of the maximum peak of phosphor B, while half of the maximum peak of phosphor A
- the value range is wider than the half-value width of the maximum peak of the phosphor B.
- Preferred embodiments of the phosphor mixture of the present invention are as follows. 1)
- the excitation intensity of phosphor B at the wavelength at which the maximum emission peak in the emission spectrum of phosphor A appears is 5% or less of the excitation intensity of phosphor B at a wavelength of 400 nm, and the emission spectrum of phosphor B 5% or less of the excitation intensity of the phosphor A at a wavelength of 400 nm at the wavelength at which the maximum emission peak appears.
- the emission spectrum of the phosphor A and the emission spectrum of the phosphor B are emission spectra appearing by excitation with excitation light having the same intensity at a wavelength of 400 nm, and the excitation intensity is the excitation spectrum of the phosphor A.
- the excitation spectrum of phosphor B are the intensities in the excitation spectra displayed such that the intensity at the wavelength of 400 nm in each excitation spectrum matches the emission intensity of the maximum emission peak in the emission spectrum of each phosphor.
- the difference between the wavelength at which the maximum emission peak appears in the emission spectrum of the phosphor A and the wavelength at which the maximum emission peak appears in the emission spectrum of the phosphor B is within 30 nm.
- the difference between the emission intensity of the maximum emission peak wavelength in the emission spectrum of the phosphor A and the emission intensity of the maximum emission peak wavelength in the emission spectrum of the phosphor B is 5 of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor B. It is in the range of ⁇ 80%.
- the difference between the half width of the maximum emission peak in the emission spectrum of the phosphor A and the half width of the maximum emission peak in the emission spectrum of the phosphor B is 5 to 80 of the half width of the maximum emission peak of the emission spectrum of the phosphor A. % Range.
- the emission spectrum of the phosphor A and the excitation spectrum of the phosphor B, and the excitation spectrum of the phosphor A and the emission spectrum of the phosphor B are in any one of the following relationships (1) to (4).
- the emission intensity of the emission spectrum of the phosphor B is 40% or less of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor B.
- the emission intensity of the emission spectrum of the phosphor A is 40% or less of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor A.
- the emission spectrum of phosphor A and the excitation spectrum of phosphor B intersect, and the excitation spectrum of phosphor A and the emission spectrum of phosphor B also intersect, provided that the maximum emission of the emission spectrum of phosphor A
- the sum of the emission intensity percentage of the emission spectrum of phosphor B is 40% or less.
- the emission spectrum of the phosphor A and the emission spectrum of the phosphor B are emission spectra that appear by excitation with excitation light having the same intensity at a wavelength of 400 nm, and the excitation spectrum of the phosphor A and the phosphor B
- the excitation spectrum is an excitation spectrum displayed such that the intensity at a wavelength of 400 nm in each excitation spectrum matches the emission intensity of the maximum emission peak in the emission spectrum of each phosphor.
- the emission spectrum of the phosphor A and the excitation spectrum of the phosphor B, and the excitation spectrum of the phosphor A and the emission spectrum of the phosphor B are in the relationship (1).
- the emission intensity of the emission spectrum of the phosphor B is 20% or less of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor B.
- the emission spectrum of the phosphor A and the excitation spectrum of the phosphor B, and the excitation spectrum of the phosphor A and the emission spectrum of the phosphor B are in the relationship (3) above, and at the wavelength position where the intersection occurs.
- the emission intensity of the emission spectrum of the phosphor A is 20% or less of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor A.
- the emission spectrum of phosphor A and the excitation spectrum of phosphor B, and the excitation spectrum of phosphor A and the emission spectrum of phosphor B are in the relationship (4) above, and the emission spectrum of phosphor A
- the emission spectra of phosphor A and phosphor B each have a maximum emission peak in the wavelength range of 490 to 570 nm.
- the phosphor A is a green-emitting silicate phosphor represented by the composition formula (SrBa) 2 SiO 4 : Eu 2+
- the phosphor B is represented by the composition formula BaMgAl 10 O 17 : Eu 2+ This is a green-emitting aluminate phosphor.
- At least one of phosphor A and phosphor B is covered with a fluorine-containing film.
- the phosphor mixture of the present invention can be advantageously used as a visible light emission source of a light emitting device such as a white LED that is desired to exhibit a color rendering property similar to that of sunlight in addition to high emission intensity.
- a light emitting device such as a white LED that is desired to exhibit a color rendering property similar to that of sunlight in addition to high emission intensity.
- the phosphor mixture of the present invention by adjusting the mixing ratio of two types of phosphors that emit light of the same color, in consideration of matching with the emission characteristics of phosphors of other colors, in the visible region
- the emission intensity at the maximum emission peak wavelength and the full width at half maximum of the maximum emission peak can be arbitrarily set.
- FIG. 1 It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 1 used by manufacture of the phosphor mixture 1 of Example 3, and the excitation spectrum of an aluminate green light emission fluorescent substance. It is a figure which shows the emission spectrum of the aluminate green light emission fluorescent substance used by manufacture of the phosphor mixture 1 of Example 3, and the excitation spectrum of the silicate green light emission fluorescent substance 1.
- FIG. It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 1, the aluminate green light emission fluorescent substance, and the fluorescent substance mixture 1.
- FIG. 2 It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 2 used by manufacture of the fluorescent substance mixture 2 of Example 3, and the excitation spectrum of aluminate green light emission fluorescent substance.
- FIG. It is a figure which shows the emission spectrum of the aluminate green light emission fluorescent substance used by manufacture of the fluorescent substance mixture 2 of Example 3, and the excitation spectrum of the silicate green light emission fluorescent substance 2.
- FIG. It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 2, the aluminate green light emission fluorescent substance, and the fluorescent substance mixture 2.
- FIG. It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 2 used by manufacture of the phosphor mixture 3 of Example 3, and the excitation spectrum of the silicate green light emission fluorescent substance 1.
- FIG. It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 1 used by manufacture of the fluorescent substance mixture 3 of Example 3, and the excitation spectrum of the silicate green light emission fluorescent substance 2.
- FIG. It is a figure which shows the emission spectrum of the silicate green light emission fluorescent substance 1, the silicate green light emission fluorescent substance 2, and the fluorescent substance mixture 3.
- the phosphor mixture of the present invention has a maximum emission peak wavelength difference within 50 nm, and the maximum emission peak wavelength of the other phosphor compared to the emission intensity at the maximum emission peak wavelength of one of the phosphors.
- the two phosphors satisfying the condition that the half-width of the maximum emission peak of the former phosphor is wider than the half-width of the maximum emission peak of the latter phosphor.
- the phosphor with the wider half-value width of the maximum emission peak is phosphor A (maximum emission peak wavelength: ⁇ A , emission intensity at the maximum emission peak wavelength: I A , maximum emission peak The half-value width: W A ), and the phosphor having the higher emission intensity at the maximum emission peak wavelength is the phosphor B (maximum emission peak wavelength: ⁇ B , emission intensity at the maximum emission peak wavelength: I B , maximum emission peak)
- the full width at half maximum: W B will be described.
- one of the maximum emission peak wavelengths ( ⁇ A , ⁇ B ) of the phosphor A and the phosphor B may be larger or the same.
- the difference between the maximum emission peak wavelengths of phosphor A and phosphor B (absolute value of ⁇ A - ⁇ B ) is generally within 50 nm, preferably within 30 nm, particularly preferably within 20 nm.
- the maximum emission peak wavelengths of phosphor A and phosphor B are each preferably in the wavelength range of 490 to 570 nm, and particularly preferably in the wavelength range of 500 to 550 nm.
- the difference (W A ⁇ W B ) of the maximum emission peak between phosphor A and phosphor B is in the range of 5 to 80% of the half width (W A ) of the maximum emission peak of phosphor A. Preferably, it is in the range of 20 to 80%, and particularly preferably in the range of 30 to 80%. Further, the difference in half-value width (W A ⁇ W B ) between the maximum emission peaks of phosphor A and phosphor B is in the range of 5 to 70% of the half-value width (W A ) of the maximum emission peak of phosphor A, particularly It is also preferably in the range of 20 to 60%.
- the difference in emission intensity (I B ⁇ I A ) between the maximum emission peaks of phosphor A and phosphor B is in the range of 5 to 80% of the emission intensity (I B ) at the maximum emission peak wavelength of phosphor B. Preferably, it is in the range of 20 to 60%, more preferably in the range of 25 to 60%.
- the difference in emission intensity (I B ⁇ I A ) between the maximum emission peak of phosphor A and phosphor B is in the range of 5 to 50% of the emission intensity (I B ) at the maximum emission peak wavelength of phosphor B. In particular, a range of 20 to 50% is also preferable.
- the emission spectrum of the phosphor A and the excitation spectrum of the phosphor B are: When there is no overlapping (does not intersect) or there is an overlapping region, the area of the overlapping region is preferably small. When there is an overlapping region between the emission spectrum of phosphor A and the excitation spectrum of phosphor B, the excitation intensity of phosphor B at the maximum emission peak wavelength ( ⁇ A ) of phosphor A is the wavelength of phosphor B. It is preferably 5% or less of the excitation intensity at 400 nm.
- the phosphor A absorbs visible light generated in the phosphor B, so that the emission intensity of the phosphor mixture is not greatly reduced, and the emission spectrum of the phosphor B and the phosphor A When there is no overlap with the excitation spectrum or there is an overlapping region, it is preferable that the area of the overlapping region is small.
- the excitation intensity of the phosphor A at the maximum emission peak wavelength ( ⁇ B ) of the phosphor B is 400 nm.
- the excitation intensity is preferably 5% or less.
- the emission spectrum of the phosphor A and the emission spectrum of the phosphor B are emission spectra that appear by excitation with excitation light having the same intensity at a wavelength of 400 nm, and the excitation intensity is the excitation spectrum of the phosphor A.
- the excitation spectrum of phosphor B are the intensities in the excitation spectra displayed such that the intensity at the wavelength of 400 nm in each excitation spectrum matches the emission intensity of the maximum emission peak in the emission spectrum of each phosphor.
- the emission spectrum of phosphor A and the excitation spectrum of phosphor B, and the excitation spectrum of phosphor A and the emission spectrum of phosphor B are any of the following (1) to (4): It is preferable that the relationship is However, the emission spectrum of the phosphor A and the emission spectrum of the phosphor B are emission spectra that appear by excitation with excitation light having the same intensity at a wavelength of 400 nm, and the excitation spectrum of the phosphor A and the excitation spectrum of the phosphor B described above. Is an excitation spectrum displayed such that the intensity at a wavelength of 400 nm in each excitation spectrum matches the emission intensity of the maximum emission peak in the emission spectrum of each phosphor.
- the emission spectrum of phosphor A and the excitation spectrum of phosphor B do not intersect, and the excitation spectrum of phosphor A and the emission spectrum of phosphor B do not intersect.
- the emission spectrum of phosphor A and the excitation spectrum of phosphor B do not intersect, but the excitation spectrum of phosphor A and the emission spectrum of phosphor B intersect, but at the wavelength position where the intersection occurs.
- the emission intensity of the emission spectrum of the phosphor B is 40% or less, more preferably 30% or less, particularly preferably 20% or less of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor B.
- the excitation spectrum of phosphor A and the emission spectrum of phosphor B do not intersect, but the emission spectrum of phosphor A and the excitation spectrum of phosphor B intersect, but at the wavelength position where the intersection occurs.
- the emission intensity of the emission spectrum of the phosphor A is 40% or less, more preferably 30% or less, particularly preferably 20% or less of the emission intensity of the maximum emission peak in the emission spectrum of the phosphor A.
- the emission spectrum of phosphor A and the excitation spectrum of phosphor B intersect, and the excitation spectrum of phosphor A and the emission spectrum of phosphor B also intersect, provided that the maximum emission of the emission spectrum of phosphor A
- the total with the percentage of the emission intensity of the emission spectrum of the phosphor B is 40% or less, more preferably 30% or less, and particularly preferably 20% or less.
- the ratio of the content of phosphor A and phosphor B is generally in the range of 5:95 to 95: 5, preferably in the range of 20:80 to 80:20.
- the phosphor mixture of the present invention satisfies the following formula (I) when the emission intensity I at the maximum emission peak wavelength is X: Y as the mixing ratio (mass ratio) of phosphor A and phosphor B: It is particularly preferable that the formula (II) is satisfied.
- the internal quantum efficiency ⁇ ′ is a mixing ratio (mass ratio) of the phosphor A and the phosphor B, and the internal quantum efficiency of the phosphor A is ⁇ ′ A and the phosphor.
- the internal quantum efficiency of B is ⁇ ′ B
- the external quantum efficiency ⁇ is X: Y as the mixing ratio (mass ratio) of phosphor A and phosphor B
- the external quantum efficiency of phosphor A is between ⁇ A and phosphor B.
- Examples of the phosphor A and the phosphor B include a silicate green light emitting phosphor having a composition formula of (SrBa) 2 SiO 4 : Eu 2+ , and a composition formula of BaMgAl 10 O 17 : Eu 2+ , And an aluminate green light emitting phosphor represented by Mn 2+ .
- the phosphor A and the phosphor B may be coated with a fluorine-containing film in order to prevent a decrease in emission intensity due to contact with moisture.
- the fluorine-containing film is preferably formed by a method of heat-treating a mixture containing phosphor and ammonium fluoride.
- the ammonium fluoride content of the mixture is generally in the range of 0.5 to 15 parts by weight, preferably in the range of 1 to 10 parts by weight, based on 100 parts by weight of the phosphor.
- the heating temperature of the mixture is generally in the range of 200 to 600 ° C., preferably in the range of 200 to 500 ° C., more preferably in the range of 200 to 480 ° C., particularly preferably in the range of 300 to 480 ° C.
- the heating time of the mixture is generally in the range of 1 to 5 hours.
- Phosphor A and phosphor B may be mixed to form a phosphor mixture, and then coated with a fluorine-containing film, or phosphor A and phosphor B may be coated with a fluorine-containing film, and then mixed. Also good.
- the heat treatment of the mixture is preferably performed in any atmosphere such as an air atmosphere, a nitrogen gas atmosphere, or an argon gas atmosphere, and particularly preferably in an air atmosphere.
- the heat treatment of the mixture is preferably performed in a state where the mixture is put in a heat-resistant container such as a crucible and the heat-resistant container is covered. Even when heat treatment is performed in an air atmosphere, the thermal decomposition of ammonium fluoride occurs at a relatively low temperature. Therefore, before the emission intensity decreases due to heating in the air atmosphere, the phosphor surface becomes ammonium fluoride. Since the fluorine-containing film is formed by treatment with the pyrolysis gas, the emission intensity does not decrease.
- the phosphor mixture of the present invention may contain three color light emitting phosphors, a blue light emitting phosphor, a green light emitting phosphor, and a red light emitting phosphor.
- the emission phosphor of at least one of the three emission phosphors is the condition of the present invention, that is, the difference in maximum emission peak wavelength is within 50 nm, and the maximum emission peak of one of the phosphors
- the emission intensity at the maximum emission peak wavelength of the other phosphor is higher than the emission intensity at the wavelength, and the maximum emission peak of the former phosphor is compared with the half width of the maximum emission peak of the latter phosphor. It is preferably composed of two types of phosphors that satisfy the condition that the half-value width is wide.
- FIG. 1 is a cross-sectional view of an example of a white LED using the phosphor mixture of the present invention as a visible light source.
- a white LED includes a substrate 1, a semiconductor light emitting device 3 fixed on the substrate 1 with an adhesive 2, a pair of electrodes 4a and 4b formed on the substrate 1, a semiconductor light emitting device 3 and an electrode.
- Lead wires 5a and 5b that electrically connect 4a and 4b, a resin layer 6 that covers the semiconductor light emitting element 3, a phosphor mixture-containing resin composition layer 7 provided on the resin layer 6, and a resin layer 6 And a light reflecting material 8 covering the periphery of the phosphor mixture-containing resin composition layer 7, and conductive wires 9a and 9b for electrically connecting the electrodes 4a and 4b to an external power source (not shown).
- the substrate 1 preferably has high insulation and high thermal conductivity.
- the substrate 1 include a substrate formed from a ceramic such as alumina or nitrogen aluminum, and a substrate formed from a resin material in which inorganic particles such as metal oxide or glass are dispersed.
- the semiconductor light emitting element 3 preferably emits light having a wavelength of 350 to 430 nm by applying electric energy.
- an AlGaN-based semiconductor light emitting element can be cited.
- the resin layer 6 is formed from a transparent resin.
- the transparent resin material that forms the resin layer 6 include an epoxy resin and a silicone resin.
- the phosphor mixture-containing resin composition layer 7 is formed of a phosphor-containing resin composition in which a blue light-emitting phosphor, a green light-emitting phosphor, and a red light-emitting phosphor are dispersed in a resin binder, respectively.
- the blue light-emitting phosphor, the green light-emitting phosphor and the red light-emitting phosphor are preferably silicate phosphors each having the above-described fluorine-containing compound coating layer.
- the resin binder is a transparent resin, and examples thereof include an epoxy resin and a silicone resin.
- the light reflecting material 8 improves the luminous efficiency of visible light by reflecting the visible light generated in the phosphor mixture-containing resin composition layer 7 toward the outside.
- the material for forming the light reflecting material 8 include metals such as Al, Ni, Fe, Cr, Ti, Cu, Rh, Ag, Au, and Pt, alumina, zirconia, titania, magnesia, zinc oxide, calcium carbonate, and the like. Examples thereof include a resin material in which a white metal compound and a white pigment are dispersed.
- the semiconductor light emitting element 3 when a voltage is applied to the electrodes 4a and 4b through the conductive wires 9a and 9b, the semiconductor light emitting element 3 emits light, and emitted light having a peak in a wavelength range of 350 to 430 nm is generated.
- the emitted light excites each color emitting phosphor in the phosphor mixture-containing resin composition layer 7 to generate blue, green and red visible lights.
- White LED can be manufactured as follows, for example. Electrodes 4a and 4b are formed on the substrate 1 in a predetermined pattern. Next, after fixing the semiconductor light emitting element 3 with the adhesive 2 on the substrate 1, the lead wires 5a and 5b for electrically connecting the semiconductor light emitting element 3 and the electrodes 4a and 4b are formed by a method such as wire bonding. Form. Next, after fixing the light reflecting material 8 around the semiconductor light emitting element 3, a transparent resin material is poured onto the semiconductor light emitting element 3 and the transparent resin material is solidified to form the resin layer 6. And the resin composition containing a fluorescent substance mixture is poured on the resin layer 6, the fluorescent substance containing resin composition is solidified, and the fluorescent substance mixture containing resin composition layer 7 is formed.
- Example 1 Two types of phosphors (SrBa) 2 SiO 4 : Eu 2+ (corresponding to phosphor A) and BaMgAl 10 O 17 : Eu 2+ , Mn 2+ (corresponding to phosphor B) were prepared.
- FIG. 2 shows an emission spectrum of (SrBa) 2 SiO 4 : Eu 2+ and an excitation spectrum of BaMgAl 10 O 17 : Eu 2+ , Mn 2+ .
- (SrBa) 2 SiO 4 : Eu 2+ had a maximum emission peak wavelength of 521 nm, an emission intensity at the maximum emission peak wavelength of 61, and a half-value width of the maximum emission peak of 65 nm.
- the excitation intensity of BaMgAl 10 O 17 : Eu 2+ , Mn 2+ was 100 at a wavelength of 400 nm
- 3 was the maximum emission peak wavelength of (SrBa) 2 SiO 4 : Eu 2+ .
- FIG. 3 shows the emission spectrum of BaMgAl 10 O 17 : Eu 2+ , Mn 2+ and the excitation spectrum of (SrBa) 2 SiO 4 : Eu 2+ .
- BaMgAl 10 O 17 : Eu 2+ , Mn 2+ had a maximum emission peak wavelength of 515 nm, an emission intensity at the maximum emission peak wavelength of 100, and a half-value width of the maximum emission peak of 27 nm.
- the excitation intensity of (SrBa) 2 SiO 4 : Eu 2+ was 60 at a wavelength of 400 nm, and 0.5 at the maximum emission peak wavelength of BaMgAl 10 O 17 : Eu 2+ , Mn 2+ .
- the intensity of the emission spectrum is a relative value when the emission intensity at the maximum emission peak wavelength of BaMgAl 10 O 17 : Eu 2+ , Mn 2+ is 100, and the intensity of the excitation spectrum is BaMgAl. 10 O 17 : Eu 2+ , Mn 2+ is a relative value when the excitation intensity at a wavelength of 400 nm is defined as 100.
- the obtained phosphor mixture was irradiated with light having a wavelength of 400 nm, and an emission spectrum was measured. The result is shown in FIG. As is clear from the results of FIG. 4, phosphor mixtures (No. 2 to 6) in which (SrBa) 2 SiO 4 : Eu 2+ and BaMgAl 10 O 17 : Eu 2+ , Mn 2+ are mixed are fluorescent.
- the emission intensity is higher than that of (SrBa) 2 SiO 4 : Eu 2+ alone (No. 1) corresponding to the phosphor A, and BaMgAl 10 O 17 : Eu 2+ , Mn 2+ alone corresponding to the phosphor B Compared with (No. 7), the full width at half maximum of the emission peak is wider.
- Example 2 (SrBa) 2 SiO 4 : Eu 2+ and BaMgAl 10 O 17 : Eu 2+ , Mn 2+ were mixed at a mass ratio of 50:50 to prepare a phosphor mixture. The emission intensity of the phosphor mixture immediately after preparation was measured. Next, 10 parts by mass of ammonium fluoride was added to and mixed with 100 parts by mass of the phosphor mixture. The obtained mixture was put into an alumina setter, covered, and heat-treated at a temperature of 500 ° C. for 6 hours in an electric furnace. The emission intensity of the phosphor mixture after heat treatment in the presence of ammonium fluoride was measured.
- the phosphor mixture heat-treated in the presence of ammonium fluoride was put into a constant temperature and humidity chamber adjusted to a temperature of 60 ° C. and a relative humidity of 80%, and left to stand. After a lapse of 500 hours from the charging, the phosphor mixture was taken out from the thermostatic chamber, and the emission intensity of the phosphor mixture was measured. Table 2 below shows the emission intensity immediately after preparation of the phosphor mixture, after heat treatment in the presence of ammonium fluoride, and after standing in a constant temperature and humidity chamber.
- the light emission intensity after heat treatment in the presence of ammonium fluoride and after standing in a constant temperature and humidity chamber is a relative value with the light emission intensity immediately after preparation of the phosphor mixture as 100.
- the phosphor mixture heat-treated in the presence of ammonium fluoride ie, the phosphor mixture coated with the fluorine-containing film (Example 2) was heated in the presence of ammonium fluoride.
- the emission intensity after standing in a constant temperature and humidity chamber is high. From this result, it can be seen that the phosphor mixture coated with the fluorine-containing coating is unlikely to cause a decrease in emission intensity due to contact with moisture (water vapor).
- Example 3 Sr 1.01 Eu 0.04 Ba 0.95 SiO 4 (silicate green emitting phosphor 1), Sr 1.46 Eu 0.04 Ba 0.50 SiO 4 (silicate green emitting phosphor 2), and Ba 0.75 Eu 0.25 Mg 0.65 Mn 0.35 Al 10 O
- phosphors 17 (aluminate green light emitting phosphor)
- Table 3 shows the peak wavelength, emission intensity, and half-value width of the maximum emission peak of each phosphor.
- the light emission intensity is a relative value with the light emission intensity of the aluminate green light emitting phosphor as 100.
- Silicate green light emitting phosphor 1 (corresponding to phosphor A) and aluminate green light emitting phosphor (corresponding to phosphor B) are mixed at a mass ratio of 50:50 to produce phosphor mixture 1. did.
- the emission spectra of the silicate green light-emitting phosphor 1, the aluminate green light-emitting phosphor, and the phosphor mixture 1 were measured using excitation light having the same intensity at a wavelength of 400 nm.
- the excitation spectrum of the silicate green light emission fluorescent substance 1 and the aluminate green light emission fluorescent substance was measured.
- FIG. 5 shows the emission spectrum of the silicate green light emitting phosphor 1 and the excitation spectrum of the aluminate green light emitting phosphor.
- FIG. 6 shows the excitation spectrum of the silicate green light emitting phosphor 1 and the aluminate green light emitting phosphor.
- FIG. 7 shows emission spectra of the silicate green light emitting phosphor 1, aluminate green light emitting phosphor, and phosphor mixture 1, respectively.
- the emission spectrum of the silicate green light-emitting phosphor 1 is a spectrum displayed with the emission intensity at the maximum emission peak wavelength of the aluminate green light-emitting phosphor as 100.
- the excitation spectrum is a spectrum displayed so that the intensity at a wavelength of 400 nm matches the emission intensity of the maximum emission peak in the emission spectrum of the aluminate green light emitting phosphor. From the spectrum of FIG.
- the emission intensity of the silicate green light-emitting phosphor 1 at the wavelength position where the emission spectrum of the silicate green light-emitting phosphor 1 and the excitation spectrum of the aluminate green light-emitting phosphor intersect is 6 Is lower than 10% of the emission intensity (61) of the maximum emission peak of the silicate green light-emitting phosphor 1.
- the emission spectrum of the aluminate green light-emitting phosphor is a spectrum displayed with the emission intensity at the maximum emission peak wavelength of the aluminate green light-emitting phosphor as 100.
- the excitation spectrum is a spectrum displayed so that the intensity at a wavelength of 400 nm matches the emission intensity of the maximum emission peak in the emission spectrum of the silicate green light emitting phosphor 1.
- the emission intensity of the aluminate green light-emitting phosphor at the wavelength position where the emission spectrum of the aluminate green light-emitting phosphor and the excitation spectrum of the silicate green light-emitting phosphor 1 intersect is 10 Is also 10% or less of the emission intensity (100) of the maximum emission peak of the aluminate green light emitting phosphor.
- the phosphor mixture 1 has higher emission intensity than the silicate green light emitting phosphor 1 corresponding to the phosphor A alone, and the aluminate green light emitting fluorescence corresponding to the phosphor B. It can be seen that the half-value width of the emission peak is wider than that of the body alone.
- Silicate green light emitting phosphor 2 (corresponding to phosphor A) and aluminate green light emitting phosphor (corresponding to phosphor B) are mixed at a mass ratio of 50:50 to produce phosphor mixture 2. did.
- the emission spectra of the silicate green light-emitting phosphor 2, the aluminate green light-emitting phosphor and the phosphor mixture 2 were measured using excitation light having the same intensity at a wavelength of 400 nm.
- the excitation spectrum of the silicate green light emission fluorescent substance 2 and the aluminate green light emission fluorescent substance was measured.
- FIG. 8 shows the emission spectrum of the silicate green light-emitting phosphor 2 and the excitation spectrum of the aluminate green light-emitting phosphor.
- FIG. 9 shows the emission spectrum of the aluminate green light-emitting phosphor and the silicate green light-emitting phosphor 2.
- FIG. 10 shows the excitation spectrum, and FIG. 10 shows the emission spectra of the silicate green light-emitting phosphor 2, the aluminate green light-emitting phosphor, and the phosphor mixture 2, respectively.
- the emission spectrum of the silicate green light-emitting phosphor 2 is a spectrum displayed with the emission intensity at the maximum emission peak wavelength of the aluminate green light-emitting phosphor as 100.
- the excitation spectrum is a spectrum displayed so that the intensity at a wavelength of 400 nm matches the emission intensity of the maximum emission peak in the emission spectrum of the aluminate green-emitting phosphor. From the spectrum of FIG.
- the emission intensity of the silicate green light-emitting phosphor 2 at the wavelength position where the emission spectrum of the silicate green light-emitting phosphor 2 and the excitation spectrum of the aluminate green light-emitting phosphor intersect is 5 Is lower than 10% of the emission intensity (48) of the maximum emission peak of the silicate green light-emitting phosphor 2.
- the emission spectrum of the aluminate green light emitting phosphor is a spectrum displayed with the light emission intensity at the maximum emission peak wavelength of the aluminate green light emitting phosphor as 100.
- the excitation spectrum is a spectrum displayed so that the intensity at a wavelength of 400 nm matches the emission intensity of the maximum emission peak in the emission spectrum of the silicate green light emitting phosphor 2.
- the emission intensity of the aluminate green light-emitting phosphor at the wavelength position where the emission spectrum of the aluminate green light-emitting phosphor and the excitation spectrum of the silicate green light-emitting phosphor 2 intersect is 10 Is also 10% or less of the emission intensity (100) of the maximum emission peak of the aluminate green light emitting phosphor.
- the phosphor mixture 2 has higher emission intensity than the silicate green light emitting phosphor 2 corresponding to the phosphor A alone, and the aluminate green light emitting fluorescence corresponding to the phosphor B. It can be seen that the half-value width of the emission peak is wider than that of the body alone.
- Silicate green light-emitting phosphor 1 (corresponding to phosphor B) and silicate green light-emitting phosphor 2 (corresponding to phosphor A) are mixed at a mass ratio of 50:50 to obtain phosphor mixture 3.
- the emission spectra of the silicate green light-emitting phosphor 1, the silicate green light-emitting phosphor 2, and the phosphor mixture 3 were measured using excitation light having a wavelength of 400 nm and the same intensity. Moreover, the excitation spectrum of the silicate green light emission fluorescent substance 1 and the silicate green light emission fluorescent substance 2 was measured.
- FIG. 3 Manufacture of phosphor mixture 3
- FIG. 11 shows the emission spectrum of the silicate green light emitting phosphor 2 and the excitation spectrum of the silicate green light emitting phosphor 1
- FIG. 12 shows the emission spectrum of the silicate green light emitting phosphor 1 and the silicate green light emitting phosphor.
- FIG. 13 shows emission spectra of the silicate green light-emitting phosphor 1, the silicate green light-emitting phosphor 2, and the phosphor mixture 3, respectively.
- the emission spectrum of the silicate green light emitting phosphor 2 is a spectrum displayed with the emission intensity at the maximum emission peak wavelength of the silicate green light emitting phosphor 1 being 100, and the silicate green light emitting phosphor.
- the excitation spectrum of 1 is a spectrum displayed so that the intensity at a wavelength of 400 nm matches the emission intensity of the maximum emission peak in the emission spectrum of the silicate green light emitting phosphor 1. From the spectrum of FIG.
- the emission spectrum of the silicate green light-emitting phosphor 1 is a spectrum displayed with the emission intensity at the maximum emission peak wavelength of the silicate green light-emitting phosphor 1 as 100, and the silicate green light-emitting phosphor 1
- the excitation spectrum of 2 is a spectrum displayed so that the intensity at a wavelength of 400 nm matches the emission intensity of the maximum emission peak in the emission spectrum of the silicate green light emitting phosphor 2. From the spectrum of FIG.
- the percentage of the emission intensity of the emission spectrum of 1 (24%) intersects the excitation spectrum of the silicate green emission phosphor 1 with respect to the emission intensity of the maximum emission peak of the emission spectrum of the silicate green emission phosphor 2.
- the total amount with the percentage (18%) of the emission intensity of the emission spectrum of the silicate green light emitting phosphor 2 at the generated wavelength position is 42%. From the results of FIG. 13, the phosphor mixture 3 has higher emission intensity than the silicate green light emitting phosphor 2 corresponding to the phosphor A alone, and the silicate green light emitting fluorescence corresponding to the phosphor B. It can be seen that the half-value width of the emission peak is wider than that of the body 1 alone.
- the sample phosphor mixture and the phosphor are respectively charged in dedicated holders, mounted on a fluorescence spectrophotometer (FP6500, Shasco Engineering), and irradiated with ultraviolet light having a wavelength of 400 nm to obtain an emission spectrum. From the emission spectrum of the obtained sample, the integral value (L) of the emission spectrum at a wavelength of 380 to 410 nm and the integral value (E) of the emission spectrum at a wavelength of 410 to 700 nm are obtained.
- FP6500 fluorescence spectrophotometer
- a reference material (a white plate made of barium sulfate) attached to the fluorescence spectrophotometer is attached to the fluorescence spectrophotometer, and an emission spectrum is obtained by irradiating ultraviolet light having a wavelength of 400 nm.
- An integral value (R) of an emission spectrum with a wavelength of 380 to 410 nm is determined from the obtained emission spectrum of the reference substance.
- Phosphor mixture 1 Mixture obtained by mixing silicate green light-emitting phosphor 1 and aluminate green light-emitting phosphor in a ratio of 50:50 (mass ratio).
- Phosphor mixture 2 A mixture of silicate green light-emitting phosphor 2 and aluminate green light-emitting phosphor mixed at a ratio of 50:50 (mass ratio).
- Phosphor mixture 3 A mixture of silicate green light-emitting phosphor 1 and silicate green light-emitting phosphor 2 mixed at a ratio of 50:50 (mass ratio).
- Silicate green light emitting phosphor 1 Sr 1.01 Eu 0.04 Ba 0.95 SiO 4
- Silicate green light emitting phosphor 2 Sr 1.46 Eu 0.04 Ba 0.50 SiO 4
- Aluminate green phosphor Ba 0.75 Eu 0.25 Mg 0.65 Mn 0.35 Al 10 O 17
- the predicted values in Table 4 above are predicted values of the internal quantum efficiency and the external quantum efficiency of the phosphor mixture when two types of phosphors included in each phosphor mixture are mixed at a 50:50 (mass ratio).
- the predicted value of the internal quantum efficiency of the phosphor mixture 1 is obtained by (internal quantum efficiency of silicate green light-emitting phosphor 1 ⁇ 50 + internal quantum efficiency of aluminate green light-emitting phosphor ⁇ 50) / 100.
- each of the internal quantum efficiency and the external quantum efficiency is higher than the predicted value, whereas in the phosphor mixture 3, It can be seen that each of the quantum efficiency and the external quantum efficiency is lower than the predicted value. This is because the silicate green light emitting phosphor 1 and the silicate green light emitting phosphor 2 contained in the phosphor mixture 3 are the silicate green light emitting phosphor 1 and the aluminate green light emitting phosphor (phosphor mixture 1).
- silicate green light-emitting phosphor 2 and aluminate green light-emitting phosphor (phosphor mixture 2), the area of the region where the emission spectrum and the excitation spectrum overlap each other is large. This is because the visible light emitted by the light emitting phosphor 1 is absorbed by the silicate green light emitting phosphor 2 and the visible light emitted by the silicate green light emitting phosphor 2 is absorbed by the silicate green light emitting phosphor 1. it is conceivable that.
Abstract
Description
しかしながら、本発明の発明者の検討によると、これまでに知られている蛍光体は、発光強度が高いものは発光光の最大発光ピークの半値幅が狭く、一方、発光光の最大発光ピークの半値幅が広いものは発光強度が低い傾向にある。従って、白色LEDを構成するための蛍光体として、充分に満足できる発光特性を得ることは困難である。
1)蛍光体Aの発光スペクトルでの最大発光ピークが現れる波長における蛍光体Bの励起強度が、蛍光体Bの波長400nmでの励起強度の5%以下であり、かつ蛍光体Bの発光スペクトルでの最大発光ピークが現れる波長における蛍光体Aの波長400nmでの励起強度の5%以下である。ただし、上記の蛍光体Aの発光スペクトルと蛍光体Bの発光スペクトルは、波長400nmで同一強度の励起光による励起により現れる発光スペクトルであり、そして上記の励起強度とは、蛍光体Aの励起スペクトルと蛍光体Bの励起スペクトルが、それぞれの励起スペクトルでの波長400nmの強度がそれぞれの蛍光体の発光スペクトルにおける最大発光ピークの発光強度と一致するように表示された励起スペクトルにおける強度である。
2)蛍光体Aの発光スペクトルで最大発光ピークが現れる波長と蛍光体Bの発光スペクトルで最大発光ピークが現れる波長の差が30nm以内である。
3)蛍光体Aの発光スペクトルにおける最大発光ピーク波長の発光強度と蛍光体Bの発光スペクトルにおける最大発光ピーク波長の発光強度の差が、蛍光体Bの発光スペクトルにおける最大発光ピークの発光強度の5~80%の範囲にある。
4)蛍光体Aの発光スペクトルにおける最大発光ピークの半値幅と蛍光体Bの発光スペクトルにおける最大発光ピークの半値幅の差が、蛍光体Aの発光スペクトルの最大発光ピークの半値幅の5~80%の範囲にある。
(1)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとが交差することなく、かつ蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルも交差することがない。
(2)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差しないが、蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとは交差する、ただし、その交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度は、蛍光体Bの発光スペクトルでの最大発光ピークの発光強度の40%以下である。
(3)蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとは交差しないが、蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差する、ただし、その交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度は、蛍光体Aの発光スペクトルでの最大発光ピークの発光強度の40%以下である。
(4)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差し、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルも交差する、ただし、蛍光体Aの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度の百分率と、蛍光体Bの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度の百分率との合計が40%以下である。
ただし、上記の蛍光体Aの発光スペクトルと蛍光体Bの発光スペクトルは、波長400nmで同一強度の励起光による励起により現れる発光スペクトルであり、そして上記の蛍光体Aの励起スペクトルと蛍光体Bの励起スペクトルは、それぞれの励起スペクトルでの波長400nmの強度がそれぞれの蛍光体の発光スペクトルにおける最大発光ピークの発光強度と一致するように表示された励起スペクトルである。
7)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(2)の関係にあって、交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度は、蛍光体Bの発光スペクトルでの最大発光ピークの発光強度の20%以下である。
8)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(3)の関係にあって、交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度は、蛍光体Aの発光スペクトルでの最大発光ピークの発光強度の20%以下である。
9)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(4)の関係にあって、蛍光体Aの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度の百分率と、蛍光体Bの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度の百分率との合計が20%以下である。
11)蛍光体Aが組成式(SrBa)2SiO4:Eu2+で表される緑色発光性のケイ酸塩蛍光体であって、蛍光体Bが組成式BaMgAl10O17:Eu2+で表される緑色発光性のアルミン酸塩蛍光体である。
12)蛍光体Aと蛍光体Bの少なくとも一方が、フッ素含有被膜により被覆されている。
(2)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差しないが、蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとは交差する、ただし、その交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度は、蛍光体Bの発光スペクトルでの最大発光ピークの発光強度の40%以下、より好ましくは30%以下、特に好ましくは20%以下である。
(3)蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとは交差しないが、蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差する、ただし、その交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度は、蛍光体Aの発光スペクトルでの最大発光ピークの発光強度の40%以下、より好ましくは30%以下、特に好ましくは20%以下である。
(4)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差し、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルも交差する、ただし、蛍光体Aの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度の百分率と、蛍光体Bの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度の百分率との合計が40%以下、より好ましくは30%以下、特に好ましくは20%以下である。
I>0.86×{(X/(X+Y))×IA+(Y/(X+Y))×IB}・・(I)
I>0.93×{(X/(X+Y))×IA+(Y/(X+Y))×IB}・・(II)
本発明の蛍光体混合物はまた、内部量子効率η’が蛍光体Aと蛍光体Bとの混合割合(質量比)をX:Yとし、蛍光体Aの内部量子効率をη’Aと蛍光体Bの内部量子効率をη’Bした場合に下記の式(III)を満足することが好ましく、式(IV)を満足することが特に好ましい。
η’>0.93×{(X/(X+Y))×η’A+(Y/(X+Y))×η’B}・・(III)
η’>1.00×{(X/(X+Y))×η’A+(Y/(X+Y))×η’B}・・(IV)
本発明の蛍光体混合物はさらに、外部量子効率ηが蛍光体Aと蛍光体Bとの混合割合(質量比)をX:Yとし、蛍光体Aの外部量子効率をηAと蛍光体Bの外部量子効率をηBした場合に下記の式(V)を満足することが好ましく、式(VI)を満足することが特に好ましい。
η>0.93×{(X/(X+Y))×η’A+(Y/(X+Y))×η’B}・・(V)
η>1.00×{(X/(X+Y))×η’A+(Y/(X+Y))×η’B}・・(VI)
(SrBa)2SiO4:Eu2+(蛍光体Aに相当)とBaMgAl10O17:Eu2+,Mn2+(蛍光体Bに相当)の二種類の蛍光体を用意した。
(SrBa)2SiO4:Eu2+とBaMgAl10O17:Eu2+,Mn2+とを、質量比50:50の割合で混合して、蛍光体混合物を調製した。調製直後の蛍光体混合物の発光強度を測定した。次いで、蛍光体混合物100質量部に対して10質量部のフッ化アンモニウムを加えて混合した。得られた混合物をアルミナセッターに投入し、蓋をして電気炉にて500℃の温度で6時間加熱処理した。フッ化アンモニウム存在下で加熱処理した後の蛍光体混合物の発光強度を測定した。フッ化アンモニウム存在下で加熱処理した蛍光体混合物を温度60℃、相対湿度80%に調整した恒温恒湿槽に投入して、静置した。投入してから500時間経過後に、恒温恒湿槽から蛍光体混合物を取り出して、その蛍光体混合物の発光強度を測定した。
下記の表2に、蛍光体混合物の調製直後、フッ化アンモニウム存在下で加熱処理後、そして恒温恒湿槽内で静置後の発光強度を示す。なお、フッ化アンモニウム存在下で加熱処理後と恒温恒湿槽内で静置後の発光強度は、蛍光体混合物の調製直後の発光強度を100とした相対値である。
試料の蛍光体混合物にキセノンランプを用いて波長400nmの光を照射して、蛍光体混合物の発光スペクトルを測定する。得られた発光スペクトルの最大発光ピークの高さを求め、この高さを発光強度とする。
蛍光体混合物にフッ化アンモニウム存在下で加熱処理を行なわずに、温度60℃、相対湿度80%に調整した恒温恒湿槽に投入したこと以外は実施例2と同様にして、蛍光体混合物を恒温恒湿槽内で500時間静置した。下記の表2に、蛍光体混合物の調製直後と恒温恒湿槽内で静置後の発光強度を示す。なお、恒温恒湿槽内で静置後の発光強度は、蛍光体混合物の調製直後の発光強度を100とした相対値である。
Sr1.01Eu0.04Ba0.95SiO4(ケイ酸塩緑色発光蛍光体1)、Sr1.46Eu0.04Ba0.50SiO4(ケイ酸塩緑色発光蛍光体2)、そしてBa0.75Eu0.25Mg0.65Mn0.35Al10O17(アルミン酸塩緑色発光蛍光体)の三種類の蛍光体を用意した。各蛍光体の最大発光ピークのピーク波長、発光強度及び半値幅を下記の表3に示す。なお、発光強度は、アルミン酸塩緑色発光蛍光体の発光強度を100とした相対値である。
ケイ酸塩緑色発光蛍光体1(蛍光体Aに相当)とアルミン酸塩緑色発光蛍光体(蛍光体Bに相当)とを質量比50:50の割合で混合して、蛍光体混合物1を製造した。ケイ酸塩緑色発光蛍光体1、アルミン酸塩緑色発光蛍光体及び蛍光体混合物1の発光スペクトルを、波長400nmで同一強度の励起光を用いて測定した。また、ケイ酸塩緑色発光蛍光体1及びアルミン酸塩緑色発光蛍光体の励起スペクトルを測定した。図5にケイ酸塩緑色発光蛍光体1の発光スペクトルとアルミン酸塩緑色発光蛍光体の励起スペクトルを、図6にケイ酸塩緑色発光蛍光体1の励起スペクトルとアルミン酸塩緑色発光蛍光体の発光スペクトルを、図7にケイ酸塩緑色発光蛍光体1、アルミン酸塩緑色発光蛍光体、そして蛍光体混合物1の発光スペクトルをそれぞれ示す。
ケイ酸塩緑色発光蛍光体2(蛍光体Aに相当)とアルミン酸塩緑色発光蛍光体(蛍光体Bに相当)とを質量比50:50の割合で混合して、蛍光体混合物2を製造した。ケイ酸塩緑色発光蛍光体2、アルミン酸塩緑色発光蛍光体及び蛍光体混合物2の発光スペクトルを、波長400nmで同一強度の励起光を用いて測定した。また、ケイ酸塩緑色発光蛍光体2及びアルミン酸塩緑色発光蛍光体の励起スペクトルを測定した。図8にケイ酸塩緑色発光蛍光体2の発光スペクトルとアルミン酸塩緑色発光蛍光体の励起スペクトルを、図9にアルミン酸塩緑色発光蛍光体の発光スペクトルとケイ酸塩緑色発光蛍光体2の励起スペクトルを、図10にケイ酸塩緑色発光蛍光体2、アルミン酸塩緑色発光蛍光体、そして蛍光体混合物2の発光スペクトルをそれぞれ示す。
ケイ酸塩緑色発光蛍光体1(蛍光体Bに相当)とケイ酸塩緑色発光蛍光体2(蛍光体Aに相当)とを質量比50:50の割合で混合して、蛍光体混合物3を製造した。ケイ酸塩緑色発光蛍光体1、ケイ酸塩緑色発光蛍光体2及び蛍光体混合物3の発光スペクトルを、波長400nmで同一強度の励起光を用いて測定した。また、ケイ酸塩緑色発光蛍光体1及びケイ酸塩緑色発光蛍光体2の励起スペクトルを測定した。図11にケイ酸塩緑色発光蛍光体2の発光スペクトルとケイ酸塩緑色発光蛍光体1の励起スペクトルを、図12にケイ酸塩緑色発光蛍光体1の発光スペクトルとケイ酸塩緑色発光蛍光体2の励起スペクトルを、図13にケイ酸塩緑色発光蛍光体1、ケイ酸塩緑色発光蛍光体2、そして蛍光体混合物3の発光スペクトルをそれぞれ示す。
蛍光体混合物1~3及びその蛍光体混合物の製造に使用したケイ酸塩緑色発光蛍光体1、ケイ酸塩緑色発光蛍光体2、アルミン酸塩緑色発光蛍光体について、内部量子効率及び外部量子効率を下記の方法により測定した。その結果を下記の表4に示す。
試料の蛍光体混合物及び蛍光体をそれぞれ専用ホルダーに仕込み、蛍光分光光度計(FP6500、シャスコエンジニアリング)に装着し、波長400nmの紫外光を照射して発光スペクトルを得る。得られた試料の発光スペクトルから波長380~410nmの発光スペクトルの積分値(L)と、波長410~700nmの発光スペクトルの積分値(E)を求める。次いで、蛍光分光光度計に付属の基準物質(硫酸バリウム製白色板)を、蛍光分光光度計に装着し、波長400nmの紫外光を照射して発光スペクトルを得る。得られた基準物質の発光スペクトルから波長380~410nmの発光スペクトルの積分値(R)を求める。求めたL、E及びRから下記の式を用いて内部量子効率及び外部量子効率を算出する。
内部量子効率=100×E/(R-L)
外部量子効率=100×E/R
蛍光体混合物2:ケイ酸塩緑色発光蛍光体2とアルミン酸塩緑色発光蛍光体とを50:50(質量比)の割合で混合した混合物。
蛍光体混合物3:ケイ酸塩緑色発光蛍光体1とケイ酸塩緑色発光蛍光体2とを50:50(質量比)の割合で混合した混合物。
ケイ酸塩緑色発光蛍光体1:Sr1.01Eu0.04Ba0.95SiO4
ケイ酸塩緑色発光蛍光体2:Sr1.46Eu0.04Ba0.50SiO4
アルミン酸塩緑色発光蛍光体:Ba0.75Eu0.25Mg0.65Mn0.35Al10O17
2 接着剤
3 半導体発光素子
4a、4b 電極
5a、5b リード線
6 樹脂層
7 蛍光体混合物含有樹脂組成物層
8 光反射材
9a、9b 導電線
Claims (13)
- 可視領域に最大発光ピークを持つ少なくとも二種類の蛍光体A、Bを含む蛍光体混合物であって、蛍光体Aの発光スペクトルで最大発光ピークが現れる波長と蛍光体Bの発光スペクトルで最大発光ピークが現れる波長の差が50nm以内であって、蛍光体Aの最大発光ピークの発光強度は蛍光体Bの最大発光ピークの発光強度よりも低く、一方蛍光体Aの最大発光ピークの半値幅は蛍光体Bの最大発光ピークの半値幅よりも広いことを特徴とする蛍光体混合物。
- 蛍光体Aの発光スペクトルでの最大発光ピークが現れる波長における蛍光体Bの励起強度が、蛍光体Bの波長400nmでの励起強度の5%以下であり、かつ蛍光体Bの発光スペクトルでの最大発光ピークが現れる波長における蛍光体Aの波長400nmでの励起強度の5%以下である請求項1に記載の蛍光体混合物、ただし、上記の蛍光体Aの発光スペクトルと蛍光体Bの発光スペクトルは、波長400nmで同一強度の励起光による励起により現れる発光スペクトルであり、そして上記の励起強度とは、蛍光体Aの励起スペクトルと蛍光体Bの励起スペクトルが、それぞれの励起スペクトルでの波長400nmの強度がそれぞれの蛍光体の発光スペクトルにおける最大発光ピークの発光強度と一致するように表示された励起スペクトルにおける強度である。
- 蛍光体Aの発光スペクトルで最大発光ピークが現れる波長と蛍光体Bの発光スペクトルで最大発光ピークが現れる波長の差が30nm以内である請求項1に記載の蛍光体混合物。
- 蛍光体Aの発光スペクトルにおける最大発光ピーク波長の発光強度と蛍光体Bの発光スペクトルにおける最大発光ピーク波長の発光強度の差が、蛍光体Bの発光スペクトルにおける最大発光ピークの発光強度の5~80%の範囲にある請求項1に記載の蛍光体混合物。
- 蛍光体Aの発光スペクトルにおける最大発光ピークの半値幅と蛍光体Bの発光スペクトルにおける最大発光ピークの半値幅の差が、蛍光体Aの発光スペクトルの最大発光ピークの半値幅の5~80%の範囲にある請求項1に記載の蛍光体混合物。
- 蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが下記の(1)~(4)のいずれかの関係にある請求項1に記載の蛍光体混合物:
(1)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとが交差することなく、かつ蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルも交差することがない、
(2)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差しないが、蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとは交差する、ただし、その交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度は、蛍光体Bの発光スペクトルでの最大発光ピークの発光強度の40%以下である、
(3)蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとは交差しないが、蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差する、ただし、その交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度は、蛍光体Aの発光スペクトルでの最大発光ピークの発光強度の40%以下である、
(4)蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトルとは交差し、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルも交差する、ただし、蛍光体Aの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度の百分率と、蛍光体Bの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度
の百分率との合計が40%以下である、
ただし、上記の蛍光体Aの発光スペクトルと蛍光体Bの発光スペクトルは、波長400nmで同一強度の励起光による励起により現れる発光スペクトルであり、そして上記の蛍光体Aの励起スペクトルと蛍光体Bの励起スペクトルは、それぞれの励起スペクトルでの波長400nmの強度がそれぞれの蛍光体の発光スペクトルにおける最大発光ピークの発光強度と一致するように表示された励起スペクトルである。 - 蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(1)の関係にある請求項6に記載の蛍光体混合物。
- 蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(2)の関係にあって、交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度は、蛍光体Bの発光スペクトルでの最大発光ピークの発光強度の20%以下である請求項6記載の蛍光体混合物。
- 蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(3)の関係にあって、交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度は、蛍光体Aの発光スペクトルでの最大発光ピークの発光強度の20%以下である請求項6記載の蛍光体混合物。
- 蛍光体Aの発光スペクトルと蛍光体Bの励起スペクトル、そして蛍光体Aの励起スペクトルと蛍光体Bの発光スペクトルとが上記の(4)の関係にあって、蛍光体Aの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Aの発光スペクトルの発光強度の百分率と、蛍光体Bの発光スペクトルの最大発光ピークの発光強度に対するその交差が発生する波長位置での蛍光体Bの発光スペクトルの発光強度の百分率との合計が20%以下である請求項6に記載の蛍光体混合物。
- 蛍光体Aと蛍光体Bのそれぞれの発光スペクトルが490~570nmの波長範囲に最大発光ピークを持つ請求項1に記載の蛍光体混合物。
- 蛍光体Aが組成式(SrBa)2SiO4:Eu2+で表される緑色発光性のケイ酸塩蛍光体であって、蛍光体Bが組成式BaMgAl10O17:Eu2+で表される緑色発光性のアルミン酸塩蛍光体である請求項11に記載の蛍光体混合物。
- 蛍光体Aと蛍光体Bの少なくとも一方が、フッ素含有被膜により被覆されている請求項1に記載の蛍光体混合物。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014516837A JPWO2013176195A1 (ja) | 2012-05-22 | 2013-05-22 | 可視領域での発光光の発光強度と演色性とが最適化された蛍光体混合物 |
US14/402,868 US20150102261A1 (en) | 2012-05-22 | 2013-05-22 | Phosphor mixture having optimized color rendering properties and emission intensity of emitted light in visible region |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-116824 | 2012-05-22 | ||
JP2012116824 | 2012-05-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013176195A1 true WO2013176195A1 (ja) | 2013-11-28 |
Family
ID=49623877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/064287 WO2013176195A1 (ja) | 2012-05-22 | 2013-05-22 | 可視領域での発光光の発光強度と演色性とが最適化された蛍光体混合物 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20150102261A1 (ja) |
JP (1) | JPWO2013176195A1 (ja) |
WO (1) | WO2013176195A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111860987A (zh) * | 2020-07-08 | 2020-10-30 | 江苏科慧半导体研究院有限公司 | 混合荧光材料发射光谱预测方法和装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4977893A (ja) * | 1972-11-03 | 1974-07-26 | ||
JP2007500776A (ja) * | 2003-05-17 | 2007-01-18 | フォスファーテック コーポレーション | シリケート蛍光りん光物質を有する発光装置 |
JP2007191680A (ja) * | 2005-09-01 | 2007-08-02 | Sharp Corp | 発光装置 |
JP2007528606A (ja) * | 2004-03-10 | 2007-10-11 | ゲルコアー リミテッド ライアビリティ カンパニー | Ledに使用するための蛍光体及びそれらの混合物 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3539329B2 (ja) * | 2000-02-04 | 2004-07-07 | ウシオ電機株式会社 | 希ガスエキシマーランプの駆動方法 |
US6809781B2 (en) * | 2002-09-24 | 2004-10-26 | General Electric Company | Phosphor blends and backlight sources for liquid crystal displays |
US8044566B2 (en) * | 2008-01-07 | 2011-10-25 | Samsung Electronics Co., Ltd. | Fluorescent mixture for fluorescent lamp, fluorescent lamp, backlight assembly having the same and display device having the same |
JP2010192259A (ja) * | 2009-02-18 | 2010-09-02 | Panasonic Electric Works Co Ltd | 無電極放電灯 |
JP5770205B2 (ja) * | 2010-11-22 | 2015-08-26 | 宇部マテリアルズ株式会社 | 高い発光特性と耐湿性とを示すケイ酸塩蛍光体及び発光装置 |
KR20130014256A (ko) * | 2011-07-29 | 2013-02-07 | 엘지이노텍 주식회사 | 발광 소자 패키지 및 이를 이용한 조명 시스템 |
-
2013
- 2013-05-22 JP JP2014516837A patent/JPWO2013176195A1/ja active Pending
- 2013-05-22 US US14/402,868 patent/US20150102261A1/en not_active Abandoned
- 2013-05-22 WO PCT/JP2013/064287 patent/WO2013176195A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4977893A (ja) * | 1972-11-03 | 1974-07-26 | ||
JP2007500776A (ja) * | 2003-05-17 | 2007-01-18 | フォスファーテック コーポレーション | シリケート蛍光りん光物質を有する発光装置 |
JP2007528606A (ja) * | 2004-03-10 | 2007-10-11 | ゲルコアー リミテッド ライアビリティ カンパニー | Ledに使用するための蛍光体及びそれらの混合物 |
JP2007191680A (ja) * | 2005-09-01 | 2007-08-02 | Sharp Corp | 発光装置 |
Also Published As
Publication number | Publication date |
---|---|
US20150102261A1 (en) | 2015-04-16 |
JPWO2013176195A1 (ja) | 2016-01-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP7036955B2 (ja) | 白色光源 | |
JP6315212B2 (ja) | 高い発光特性と耐湿性とを示すケイ酸塩蛍光体及び発光装置 | |
CN105814699B (zh) | 具有高显色性的白光发光装置 | |
JP5503870B2 (ja) | Ledに使用する蛍光体及びその配合物 | |
TWI420710B (zh) | White light and its use of white light-emitting diode lighting device | |
JP5134788B2 (ja) | 蛍光体の製造方法 | |
WO2012124267A1 (ja) | 白色光源 | |
KR101789856B1 (ko) | 청색 발광 형광체 및 그 청색 발광 형광체를 사용한 발광 장치 | |
US20200303355A1 (en) | LED Filaments and LED Filament Lamps | |
JP2009535441A (ja) | 放射線源及び発光材料を含む照明システム | |
US20190067530A1 (en) | Blue light-emitting phosphor and light emitting device using same | |
WO2012165032A1 (ja) | 発光装置 | |
JP5635268B2 (ja) | 白色発光装置及びこれを用いた車両用灯具 | |
JP2005179498A (ja) | 赤色蛍光体材料、赤色蛍光体材料を用いた白色発光ダイオードおよび白色発光ダイオードを用いた照明機器 | |
JP5770365B2 (ja) | 深赤色発光性フルオロゲルマニウム酸マグネシウム蛍光体及びその製造方法 | |
JP5689407B2 (ja) | ケイ酸塩緑色発光蛍光体 | |
WO2013176195A1 (ja) | 可視領域での発光光の発光強度と演色性とが最適化された蛍光体混合物 | |
JP5736272B2 (ja) | 青色発光蛍光体及び該青色発光蛍光体を用いた発光装置 | |
JP5638348B2 (ja) | 青色発光蛍光体及び発光装置 | |
KR20100061791A (ko) | 방전 램프 및 방전 램프에 대한 발광 화합물 | |
JP6241812B2 (ja) | 白色発光蛍光体及び白色発光装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13794595 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2014516837 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14402868 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13794595 Country of ref document: EP Kind code of ref document: A1 |