WO2020083908A1 - Roter leuchtstoff und konversions-led - Google Patents
Roter leuchtstoff und konversions-led Download PDFInfo
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- WO2020083908A1 WO2020083908A1 PCT/EP2019/078726 EP2019078726W WO2020083908A1 WO 2020083908 A1 WO2020083908 A1 WO 2020083908A1 EP 2019078726 W EP2019078726 W EP 2019078726W WO 2020083908 A1 WO2020083908 A1 WO 2020083908A1
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- WIPO (PCT)
- Prior art keywords
- phosphor
- emission
- conversion
- radiation
- red
- Prior art date
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- 238000006243 chemical reaction Methods 0.000 title claims description 61
- 239000000463 material Substances 0.000 title abstract description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 90
- 230000005855 radiation Effects 0.000 claims description 41
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 238000003786 synthesis reaction Methods 0.000 claims description 14
- 239000004065 semiconductor Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000007858 starting material Substances 0.000 claims description 5
- 229910052792 caesium Inorganic materials 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 229910052701 rubidium Inorganic materials 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 229910007549 Li2SiF6 Inorganic materials 0.000 abstract description 15
- 239000011572 manganese Substances 0.000 description 72
- 230000003595 spectral effect Effects 0.000 description 36
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 17
- 238000000295 emission spectrum Methods 0.000 description 12
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 238000009877 rendering Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 229910004009 SiCy Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000634 powder X-ray diffraction Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 0 C1CC*CC1 Chemical compound C1CC*CC1 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 125000001153 fluoro group Chemical group F* 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical compound Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000001429 visible spectrum Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910000590 K2MnF6 Inorganic materials 0.000 description 1
- 229910020440 K2SiF6 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000004456 color vision Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000005564 crystal structure determination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004761 hexafluorosilicates Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 nitride compound Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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
- C09K11/61—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing fluorine, chlorine, bromine, iodine or unspecified halogen elements
- C09K11/615—Halogenides
- C09K11/616—Halogenides with alkali or alkaline earth metals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/08—Compounds containing halogen
- C01B33/10—Compounds containing silicon, fluorine, and other elements
- C01B33/103—Fluosilicic acid; Salts thereof
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
- C01P2002/52—Solid solutions containing elements as dopants
- C01P2002/54—Solid solutions containing elements as dopants one element only
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/77—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by unit-cell parameters, atom positions or structure diagrams
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the invention relates to a phosphor and a
- Conversion LED which includes the phosphor in particular.
- the red component of the total white radiation is generated by converting blue primary light from a semiconductor layer sequence into longer-wave, red radiation by means of an inorganic phosphor.
- the shape and position of the emission band in the red spectral range play a decisive role.
- the human eye is fundamental to red radiation
- red radiation can be perceived.
- red spectral ranges in particular deep-red spectral ranges with long wavelengths, are particularly important when the
- Conversion LED has a high color rendering index (CRI) in combination with high spectral efficiency ("luminous efficacy of radiation", LER) and
- Typical red phosphors for these applications are based on Eu 2+ or Ce 3+ emissions, these elements being incorporated into inorganic host structures are introduced, in which they then produce longer-wave emissions under the absorption of blue light. These phosphors generally have broad emission spectra or emission bands. Accordingly, in the case of red-emitting phosphors, many photons are inevitably converted into such spectral ranges (large ones
- Wavelengths e.g. > 650 nm
- an attempt can be made to shift the emission spectrum to short wavelength by varying the chemical composition of the host structure, i.e. to increase the integral overlap with the eye sensitivity curve.
- Gaussian distribution of the emitted photons also leads to a reduction in the number of photons in the
- Phosphors such as the nitridolithoaluminate "SrLiAlN 4 : Eu 2+ " (WO 2013/175336 Al; narrow-band red-emitting Sr [LiAlN 4 ]: Eu 2+ as a next-generation LED phosphor material, Nature Materials 2014; P. Pust et al.)
- SrLiAlN 4 nitridolithoaluminate
- the spectral width of the emission (“full width at half maximum", FWHM) is as small as possible, and the number of photons in the spectral ranges is lower
- a phosphor in particular a red-emitting phosphor, is specified.
- the phosphor comprises a phase with the molecular formula Li SiF: Mn 4+ .
- the phosphor preferably consists of Li SiF: Mn 4+ .
- the phosphor preferably has the empirical formula L ⁇ SiF ßi Mn 44 . Mn 4+ in particular substitutes Si 4+ .
- Contaminants taken together should preferably have at most a weight percentage of the phosphor of at most 1 per thousand or 100 ppm (parts per million) or 10 ppm.
- the phosphor has the empirical formula Li Sii x Mn x F, where 0.001 ⁇ c ⁇ 0.1, preferably 0.005 ⁇ x ⁇ 0.08, particularly preferably 0.01 dc ⁇ 0.06.
- the phosphor is an Mn 4+ doped hexafluorosilicate.
- Material class is K ⁇ SiFgiMn 44 .
- the emission spectrum of this phosphor is characterized by narrow emission bands, the half-widths of these emission bands being below 10 nm and thus being significantly smaller than corresponding emission bands, for example for Eu 2+ -doped phosphors.
- KSiFg Mn 4+ is produced by a precipitation reaction in aqueous hydrofluoric acid (HF) (Efficient Mn (IV) emission in Fluorine Coordination, AG Paulusz, J. Electrochem. Soc .: Solid-State Science and Technology 1973, 942).
- HF hydrofluoric acid
- Examples of starting materials used are K 2 CO 3 or KF (which is also formed by dissolving K 2 CO 3 in HF), as well as SiCy and a manganese source.
- the synthesis for K2SiF g : Mn 4+ can not be transferred to the production of the phosphor Li2SiF6: Mn 4+ .
- the phosphor Li2SiF6: Mn 4+ does not arise from a precipitation reaction in aqueous hydrofluoric acid (HF), in particular using the starting materials
- Li2C03, SiCy and a manganese source Li2C03, SiCy and a manganese source.
- Li2SiF g : Mn 4+ has an emission or secondary radiation with a peak wavelength in the red spectral range when excited with primary radiation.
- the peak wavelength is in particular around 630 nm.
- the emission is advantageously in a preferred range for red phosphors. Due to the location of the
- Half-width of the emission bands are advantageously emitted many photons in the desired visible red spectral range and the converted photons in the long-wave red range of the visible spectrum, which are perceived very inefficiently by the human eye, are kept low. This makes the phosphor ideal for a conversion LED that emits a white total radiation
- Li2SiF6: Mn 4+ spectral efficiency ("luminous efficacy of radiation", LER) of Li2SiF6: Mn 4+ is 7% higher than that of K2SiF g : Mn 4+ , since the emission maximum of Li2SiF g : Mn 4+ compared to that of iüSiF g : Mn 4+ is at a slightly smaller wavelength.
- the "peak wavelength” or “emission maximum” refers to the wavelength in the emission spectrum of a phosphor at which the maximum intensity in the
- the phosphor crystallizes in a trigonal crystal system.
- the phosphor crystallizes in room group P321.
- the phosphor crystallizes in the Na2SiF g type.
- the well-known phosphor K2SiF g : Mn 4+ crystallizes in the cubic space group Rm-3m.
- the phosphor crystallizes in the K2PtCl g type.
- Mn 4+ can be present in mol% amounts between 0.1 mol% to 10 mol%, 0.5 mol% to 8 mol% or 1 mol% to 6 mol%.
- mol% statements for Mn 4+ are understood based on the molar proportions of Si in the phosphor.
- the phosphor is capable of emitting primary radiation from the UV to the blue Absorb spectral range and convert into secondary radiation, which is in the red spectral range.
- the phosphor according to at least one
- Embodiment has a half-value width of the emission bands below 10 nm.
- the full width at half maximum is the emission band with the maximum intensity
- the half-width (FWHM, full width at half maximum) here and below is the spectral width at half the height of the maximum of an emission peak or one
- the phosphor L ⁇ SiF ßi Mn 44 emits secondary radiation with a peak wavelength in the red when excited with primary radiation from the UV to blue spectral range
- the emission bands of the phosphor have, in particular, a half width of less than 10 nm and thus a high luminous efficacy due to a large overlap with the human eye sensitivity curve with a maximum at 555 nm. This allows you to use
- Phosphor can be provided with advantageous properties that previously could not be provided.
- the phosphor with the empirical formula L ⁇ SiF ßi Mn 44 is replaced by a
- Solid state synthesis under a pressure of 25 kbar to 85 kbar and in a temperature range between 500 ° C and 1000 ° C.
- Rb or Cs used are beta as reactants in the solid state synthesis and Li2SiF6 Cs2MnF6 or Li2SiF6 and K ⁇ MnF, particularly preferably Li2SiF6 and K ⁇ ß MnF used.
- a molar ratio of the amount of substance of Li2SiF6 to the amount of substance of A2MnF ⁇ is between 1,000 to 0.200 and 1,000 to 0.001,
- the invention further relates to a conversion LED.
- the conversion LED has the phosphor.
- Fluorescent also for the conversion LED and vice versa.
- the conversion LED has a semiconductor layer sequence.
- Semiconductor layer sequence is for the emission of
- the semiconductor material is, for example, a nitride compound semiconductor material, such as Al n Ini- nm Ga m N, 0 dn ⁇ 1, 0 dm ⁇ 1 and n + m ⁇ 1 in each case.
- the semiconductor layer sequence can have dopants and additional constituents. For the sake of simplicity, however, only the essential components of the semiconductor material.
- Substances can be replaced and / or supplemented.
- the semiconductor layer sequence is formed from InGaN.
- the semiconductor layer sequence contains an active layer with at least one pn junction and / or with one or more quantum well structures. When the conversion LED is in operation, an electromagnetic one becomes in the active layer
- a wavelength or the emission maximum the radiation is preferably in the ultraviolet and / or visible range, in particular at wavelengths between 300 nm and 470 nm inclusive.
- the conversion LED is preferably set up to emit white or colored light.
- the conversion LED is preferred
- Conversion LEDs are particularly suitable for applications in which a high color rendering index (e.g. R9) is required, such as in general lighting or
- Backlighting for example of displays that are suitable for displaying large color spaces.
- the conversion LED has a conversion element.
- the conversion element comprises the phosphor or consists of the phosphor.
- the phosphor at least partially or completely converts the electromagnetic primary radiation into electromagnetic secondary radiation in the red spectral range.
- Conversion element can also consist of the phosphor.
- the phosphor can be set up for this
- Phosphor has another red-emitting phosphor.
- the conversion element can also consist of the phosphor and the further red-emitting phosphor.
- Phosphors can be set up for this
- the further red-emitting phosphor can have the formula Sr [Al2LZ2O2N2]: Eu.
- the color location of the total radiation can advantageously be adapted as required. Furthermore, particularly high color saturation and efficiency can be achieved, which usually cannot be achieved by using only one phosphor.
- Conversion element in addition to the phosphor a second and / or third phosphor.
- the conversion element can comprise further phosphors.
- the conversion element can comprise further phosphors.
- Phosphors embedded in a matrix material can also be present in a converter ceramic.
- the conversion LED can be a second phosphor
- the conversion LED can have a third phosphor.
- the third phosphor can be set up to emit radiation from the yellow spectral range. In other words, the conversion LED can then have at least three phosphors, one yellow
- the conversion LED is for full conversion or
- Partial conversion set up the primary radiation in full conversion preferably from the UV to blue
- Spectral range and in the case of partial conversion is selected from the blue range.
- the conversion LED is then especially a white one
- the conversion LED can have a fourth phosphor.
- the fourth phosphor can be set up to emit radiation from the blue spectral range.
- the conversion LED can then have at least three phosphors, a blue-emitting phosphor, a green-emitting phosphor and the red
- the conversion LED is set up for full conversion, the primary radiation in the case of full conversion preferably being selected from the UV spectral range.
- the conversion LED is then especially a white one
- Yellow, blue and green phosphors are known to the person skilled in the art and are not listed separately here.
- luminescent materials in particular can increase the color rendering index.
- Phosphors in addition to the second, third and / or fourth phosphor are in particular not
- Li SiFg: Mn 4+ was produced using a solid-state synthesis in a multianvil high-pressure press at pressures of 5.5 GPa (55 kbar) and high temperatures. Li SiF and K ⁇ MnF ß were used as starting materials in a molar ratio of 1 to 0.059
- the pressure of 55 kbar was built up within 145 minutes.
- the temperature was raised to 750 ° C at a heating rate of 75 ° C per minute and the temperature was held at 750 ° C for 150 minutes.
- the temperature was then cooled to 2.2 ° C. from 350 ° C. and the phosphor was then quenched to room temperature (25 ° C.).
- the pressure was then released within 145 minutes.
- Figure 1A shows the unit cell of cubic
- KSiFg Mn 4+ (room group No. 225; Fm-3m).
- Figure 1B shows the unit cell of the invention
- Fluorescent Li2SiF6 Mn 4+ .
- FIG. 1 shows an emission spectrum of the
- FIG. 3 shows a PXRD comparison (Mo-Kog radiation) of Li2SiF6: Mn 4+ with a simulation of
- FIG. 4 shows an emission spectrum of the
- FIG. 1A shows the unit cell of the crystal structure of K2SiFg: Mn 4+ , which is in the cubic space group Fm-3m
- FIG. 1B shows the unit cell of the crystal structure of Li2SiF6: Mn 4+ .
- the Li atoms are as unfilled ellipsoids, the F atoms are shown as filled circles and SiF g octahedra with Si hatched in the center and F at the corners.
- Si is partially substituted for Mn (not shown), so that Mn 4+ is octahedrally surrounded by F atoms.
- Unit cell shows a trigonal metric
- FIGS. 1A and 1B clearly shows that the crystal structures differ significantly from one another, for example the SiF g octahedra are cubic
- Li2SiF g : Mn 4+ take different spatial orientations.
- FIG. 3 shows a comparison of X-ray diffraction (PXRD) diffractograms (Mo-Kog radiation). It is shown
- Figure 4 shows an emission spectrum of the phosphor according to the invention Li2SiF g : Mn 4+ compared to that of K2SiF g : Mn 4+ and from Cs2MnF g .
- the peak at about 618 nm of Li2SiF g : Mn 4+ is missing in the case of the two other phosphors K2SiF g : Mn 4+ and Cs2MnF g . Since the eye sensitivity curve has a large (negative) slope in the area of the emission maxima of the three phosphors here, even a small shift in the emission band (CIE color coordinates x and y) results in significantly different spectral efficiency, as shown in the table and FIG. 5 below.
- the dominance wavelength is one way to mix non-spectral (polychromatic) light by spectral
- intersection which is closer to said color, represents the dominance wavelength of the color as the wavelength of the pure spectral color thereon
- Wavelength perceived by the human eye is the Wavelength perceived by the human eye.
- Phosphor Li2SiF g : Mn 4+ according to the invention has the greatest spectral efficiency in comparison to K2SiFg: Mn 4+ and Cs2MnF g : Mn 4+ .
- FIG. 6 shows absorption spectra and emission spectra from a comparative example VB2 and K2SiF g : Mn 4+ .
- the data for K2SiF g : Mn 4+ correspond to that of the literature (Mn 4+ -Activated Red Photoluminescence in K ⁇ SiF g Phosphor, Journal often he
- the amount of substance for the LZ2CO3 is in the reduced
- the phosphor Li2SiFg: Mn 4+ does not arise from a precipitation reaction in aqueous hydrofluoric acid (HF) using the starting materials LZ2CO3,
- the product obtained from VB2 shows, as in FIG. 6
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- Inorganic Chemistry (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201980070134.1A CN112955524A (zh) | 2018-10-24 | 2019-10-22 | 红色的发光材料和转换型led |
KR1020217014200A KR20210081360A (ko) | 2018-10-24 | 2019-10-22 | 적색 발광 재료 및 변환 led |
JP2021522373A JP7263511B2 (ja) | 2018-10-24 | 2019-10-22 | 赤色蛍光体および変換led |
US17/268,969 US20210246369A1 (en) | 2018-10-24 | 2019-10-22 | Red luminescent material and conversion led |
Applications Claiming Priority (2)
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DE102018218159.4A DE102018218159B4 (de) | 2018-10-24 | 2018-10-24 | Roter leuchtstoff, verfahren zur herstellung eines leuchtstoffs und konversions-led |
DE102018218159.4 | 2018-10-24 |
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WO2020083908A1 true WO2020083908A1 (de) | 2020-04-30 |
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PCT/EP2019/078726 WO2020083908A1 (de) | 2018-10-24 | 2019-10-22 | Roter leuchtstoff und konversions-led |
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US (1) | US20210246369A1 (de) |
JP (1) | JP7263511B2 (de) |
KR (1) | KR20210081360A (de) |
CN (1) | CN112955524A (de) |
DE (1) | DE102018218159B4 (de) |
WO (1) | WO2020083908A1 (de) |
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WO2021213900A1 (de) | 2020-04-22 | 2021-10-28 | Osram Opto Semiconductors Gmbh | Roter leuchtstoff und konversions-led |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013175336A1 (en) | 2012-05-22 | 2013-11-28 | Koninklijke Philips N.V. | New phosphors, such as new narrow-band red emitting phosphors, for solid state lighting |
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CN103367611B (zh) * | 2012-03-28 | 2017-08-08 | 日亚化学工业株式会社 | 波长变换用无机成型体及其制造方法以及发光装置 |
JP6069890B2 (ja) * | 2012-05-29 | 2017-02-01 | 日亜化学工業株式会社 | 波長変換用無機成形体及び発光装置 |
WO2013158929A1 (en) | 2012-04-18 | 2013-10-24 | Nitto Denko Corporation | Phosphor ceramics and methods of making the same |
JP6287311B2 (ja) * | 2013-12-06 | 2018-03-07 | 日亜化学工業株式会社 | フッ化物蛍光体及びその製造方法 |
WO2016133110A1 (ja) * | 2015-02-18 | 2016-08-25 | デンカ株式会社 | 蛍光体の製造方法 |
TWI696726B (zh) | 2015-03-05 | 2020-06-21 | 美商通用電機股份有限公司 | 發紅光磷光體、彼之製法及含彼之裝置 |
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WO2013175336A1 (en) | 2012-05-22 | 2013-11-28 | Koninklijke Philips N.V. | New phosphors, such as new narrow-band red emitting phosphors, for solid state lighting |
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KR20210081360A (ko) | 2021-07-01 |
DE102018218159B4 (de) | 2024-01-25 |
JP2022505724A (ja) | 2022-01-14 |
CN112955524A (zh) | 2021-06-11 |
US20210246369A1 (en) | 2021-08-12 |
JP7263511B2 (ja) | 2023-04-24 |
DE102018218159A1 (de) | 2020-04-30 |
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