WO2016136955A1 - 紫外線発光蛍光体、その製造方法、発光素子、及び発光装置 - Google Patents
紫外線発光蛍光体、その製造方法、発光素子、及び発光装置 Download PDFInfo
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- WO2016136955A1 WO2016136955A1 PCT/JP2016/055863 JP2016055863W WO2016136955A1 WO 2016136955 A1 WO2016136955 A1 WO 2016136955A1 JP 2016055863 W JP2016055863 W JP 2016055863W WO 2016136955 A1 WO2016136955 A1 WO 2016136955A1
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- ultraviolet light
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- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000126 substance Substances 0.000 title abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 86
- 239000011701 zinc Substances 0.000 claims description 28
- 239000013078 crystal Substances 0.000 claims description 24
- 229910052725 zinc Inorganic materials 0.000 claims description 24
- 229910052783 alkali metal Inorganic materials 0.000 claims description 15
- 150000001340 alkali metals Chemical class 0.000 claims description 14
- 150000004820 halides Chemical class 0.000 claims description 7
- 229910001508 alkali metal halide Inorganic materials 0.000 claims description 4
- 150000008045 alkali metal halides Chemical class 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 229910001676 gahnite Inorganic materials 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 description 15
- 230000001954 sterilising effect Effects 0.000 description 14
- 230000006866 deterioration Effects 0.000 description 11
- 238000004659 sterilization and disinfection Methods 0.000 description 11
- 230000005284 excitation Effects 0.000 description 10
- 238000010894 electron beam technology Methods 0.000 description 9
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 6
- 229910052753 mercury Inorganic materials 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 229910018516 Al—O Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000000844 anti-bacterial effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 206010011409 Cross infection Diseases 0.000 description 1
- 206010012438 Dermatitis atopic Diseases 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241001263478 Norovirus Species 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- 201000008937 atopic dermatitis Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 241000712461 unidentified influenza virus Species 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/64—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing aluminium
-
- 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
Definitions
- the present invention relates to an ultraviolet light-emitting phosphor that emits ultraviolet light, and particularly to an ultraviolet light-emitting phosphor having excellent deterioration resistance and light emission intensity.
- UV light emission field the industrial value is increasing as the use of ultraviolet light is expanded to various fields such as the medical field and the photocatalyst field.
- deep ultraviolet light which indicates light in the wavelength range of 200 to 350 nm
- DUV deep ultraviolet light
- fungi such as influenza virus, norovirus, and candita
- As a clean sterilization without gene resistance it is effective not only for water and animal and plant sterilization, air sterilization and instrument sterilization in hospitals and homes, but also for the application of decomposition of refractory substances and synthesis of chemical substances, medical treatment It is expected to be used in a wide range of applications.
- development and improvement of a light emitter capable of exhibiting ultraviolet light emission has been advanced.
- mercury lamps using mercury are mainly used as light emitters that emit ultraviolet light. This is because the mercury lamp can be manufactured at low cost and can easily exhibit high energy.
- a conventional light source that emits ultraviolet light has an electron beam as an excitation source.
- an electron beam as an excitation source.
- one that emits ultraviolet rays by irradiating a ZnAl 2 O 4 phosphor with an electron beam as an excitation source is known (see Non-Patent Document 1).
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an ultraviolet light-emitting phosphor having particularly excellent deterioration resistance and emission intensity.
- an ultraviolet-emitting phosphor capable of solving the above problems can be obtained by irradiating a certain type of phosphor with vacuum ultraviolet rays. It was.
- the ultraviolet light-emitting phosphor disclosed in the present application is a phosphor represented by ZnAl 2 O 4 composed of zinc element, aluminum element, and oxygen element, which is irradiated with vacuum ultraviolet light and irradiated with the vacuum ultraviolet light.
- An ultraviolet light-emitting phosphor that emits ultraviolet light when excited by is provided.
- a light-emitting element using the ultraviolet light-emitting phosphor disclosed in the present application is also provided.
- a light-emitting device including the light-emitting element disclosed in the present application is also provided.
- a phosphor expressed by ZnAl 2 O 4 composed of zinc element, aluminum element, and oxygen element, which emits ultraviolet light when irradiated with vacuum ultraviolet light and excited by the irradiation of vacuum ultraviolet light.
- a method for producing a phosphor which comprises adding an alkali metal halide and firing the phosphor.
- the X-ray-diffraction result of the ultraviolet light emission fluorescent substance which concerns on Example 1 is shown.
- the result of the emission intensity spectrum of the ultraviolet light-emitting phosphor according to Example 1 is shown.
- the abundance ratio of the aluminum element to zinc element in the crystal structure of the ultraviolet light emitting phosphor ZnAl 2 O 4 in according to Example 2 shows the results of the emission intensity spectrum for the phosphor of 2.1.
- the abundance ratio of the aluminum element to zinc element in the crystal structure of the ultraviolet light emitting phosphor ZnAl 2 O 4 in according to Example 2 shows the results of the emission intensity spectrum for the phosphor of 2.1.
- the abundance ratio of the aluminum element to zinc element in the crystal structure of the ultraviolet light emitting phosphor ZnAl 2 O 4 in according to Example 2 shows the results of the emission intensity spectrum for the phosphor of 2.2.
- the abundance ratio of the aluminum element to zinc element in the crystal structure of the ultraviolet light emitting phosphor ZnAl 2 O 4 in according to Example 2 shows the results of the emission intensity spectrum for the phosphor of 2.2.
- the abundance ratio of the aluminum element to zinc element in the crystal structure of the ultraviolet light emitting phosphor ZnAl 2 O 4 in according to Example 2 shows the results of the emission intensity spectrum for the phosphor of 2.3.
- the abundance ratio of the aluminum element to zinc element in the crystal structure of the ultraviolet light emitting phosphor ZnAl 2 O 4 in according to Example 2 shows the results of the emission intensity spectrum for the phosphor of 2.3.
- the ultraviolet light-emitting phosphor disclosed in the present application is a phosphor represented by ZnAl 2 O 4 composed of zinc element, aluminum element, and oxygen element, and is excited by irradiation with vacuum ultraviolet light.
- a phosphor represented by ZnAl 2 O 4 composed of zinc element, aluminum element, and oxygen element, and is excited by irradiation with vacuum ultraviolet light.
- an ultraviolet light emitting phosphor that emits ultraviolet light there is no particular limitation.
- the vacuum ultraviolet ray serving as an excitation source refers to an ultraviolet ray having a wavelength of 200 nm or less, and for example, an ultraviolet ray having a wavelength of 147 nm, an ultraviolet ray having a wavelength of 172 nm, or the like can be used.
- the ultraviolet light-emitting phosphor disclosed in the present application can emit ultraviolet light in various wavelength regions by irradiation with this vacuum ultraviolet light. For example, deep ultraviolet light in a wavelength region of 200 to 350 nm that is useful for various applications ( DUV) can also emit light.
- ultraviolet light emitting phosphor disclosed in the present application is excited by irradiation with vacuum ultraviolet light, ultraviolet light is emitted by receiving gentler energy than in the case of conventional electron beam irradiation, Since the structure does not receive charges such as lines, charge build-up in the phosphor does not occur in principle, and damage to the phosphor is greatly suppressed, resulting in high emission over a long period of time. It is possible to exhibit excellent deterioration resistance that strength can be maintained.
- the ultraviolet light-emitting phosphor disclosed in the present application has a structure in which the charge-up of electrons, which has been a major cause of causing deterioration of the ultraviolet light-emitting phosphor due to excitation of conventional electron beams, is not mechanically generated. High deterioration resistance, which cannot be obtained with an ultraviolet light emitting phosphor by electron beam excitation, can be obtained with certainty.
- the abundance of the aluminum element in the crystal structure of ZnAl 2 O 4 is relatively larger than the abundance of the zinc element. That is, the abundance ratio of aluminum element to zinc element in the crystal structure of ZnAl 2 O 4 [that is, (aluminum element abundance ratio) / (zinc element abundance ratio)] is preferably larger than 2. Further, in this range, from the viewpoint of obtaining higher emission intensity, the abundance ratio (Al / Zn) is more preferably 2.1 to 2.3.
- the ultraviolet light-emitting phosphor disclosed in the present application preferably further contains an alkali metal element when used for sterilization.
- the alkali metal element is a group 1 element in the periodic table, and includes lithium element, sodium element, potassium element, rubidium element, cesium element, etc., but lithium element or potassium element is particularly used because of easy handling. It is preferable.
- This alkali metal element can be contained significantly by adding a halide of an alkali metal element and baking it in the baking step in the production of the present phosphor.
- the baking in this baking process can be performed in an air atmosphere, and can also be performed in a reducing atmosphere after that.
- halogen element constituting this halide, it is preferable to use chlorine element or fluorine element from the viewpoint of ease of handling.
- chlorine element or fluorine element for example, lithium fluoride (LiF), potassium fluoride (KF), potassium chloride (KCl), Lithium chloride (LiCl) or the like can be used.
- the addition amount of the alkali metal halide is not particularly limited, but is preferably 1 to 10% by weight, and 1 to 5% by weight from the viewpoint of exhibiting higher emission intensity. Is more preferable.
- the ultraviolet light-emitting phosphor disclosed in the present application contains the alkali metal element, and thus can emit light having a peak wavelength region of about 260 nm while maintaining the above-described high light emission intensity.
- ultraviolet rays having a wavelength of about 260 nm exhibit a particularly excellent sterilization effect (for example, http://www.senlights.co.jp/tech/damp01.html). Sen Special Light Source Co., Ltd.).
- the ultraviolet light-emitting phosphor disclosed in the present application can exhibit a strong sterilization effect by containing an alkali metal element, and is particularly useful for sterilization applications (described later). See Examples).
- the ultraviolet light-emitting phosphor according to the present application exhibits such excellent effects has not been elucidated in detail, but constitutes a phosphor represented by ZnAl 2 O 4 when irradiated with vacuum ultraviolet rays.
- Zn—Al—O structure it is considered that there are inherent structural factors that specifically act on the wavelength region of vacuum ultraviolet rays.
- the distance between the atoms constituting the Zn—Al—O structure and the length of the wavelength of the vacuum ultraviolet rays act favorably, and the light in the ultraviolet band is specific at the atomic level. It is presumed that the energy level is easily changed.
- the ultraviolet light emitting phosphor when the abundance of aluminum element in the crystal structure of ZnAl 2 O 4 is relatively larger than the abundance of zinc element, ZnAl 2 O 4 A Zn—Al—O defect structure in which the abundance of aluminum elements is biased in the crystal structure is formed, and the wavelength of the vacuum ultraviolet light irradiated into the voids of lattice defects in the Zn—Al—O defect structure is compatible. It is presumed that there is a light emission mechanism that matches and amplifies light in the ultraviolet band and emits light with high energy.
- the stoichiometric ratio is such that the composition of the desired phosphor is obtained using oxides of the respective constituent elements as raw materials.
- this raw material powders of zinc oxide (ZnO) and aluminum oxide (Al 2 O 3 ), which are oxides of each constituent element, can be used.
- the ultraviolet light-emitting phosphor according to the present application can be obtained by baking a powder obtained by mixing this raw material at a high temperature in an air atmosphere.
- This high-temperature firing can be performed, for example, at a temperature of 1000 ° C. to 1500 ° C. for 3 to 10 hours.
- an ultraviolet light-emitting phosphor can be obtained by baking this raw material at 1200 ° C. for 5 hours in an air atmosphere.
- the use of the ultraviolet light-emitting phosphor thus obtained is wide-ranging.
- the deep ultraviolet light (200 nm to 350 nm) emitted by the ultraviolet light emitting phosphor according to the present invention sterilization is performed on various sterilization targets, thereby reducing the residue and environmental damage caused by ultraviolet rays. Can be sterilized.
- deep ultraviolet light having a wavelength in the vicinity of the above-described peak wavelength region of 260 nm that exhibits an excellent sterilizing effect it can be used in a wide range of applications as a sterilizing application.
- this deep ultraviolet light it is possible to perform decomposition treatment of hardly decomposed substances (for example, formaldehyde and PCB) or to synthesize new chemical substances (for example, photocatalytic substance). Further, by using this deep ultraviolet light, it can be applied to various medical fields such as treatment of intractable diseases (for example, atopic dermatitis) and prevention of nosocomial infection.
- hardly decomposed substances for example, formaldehyde and PCB
- new chemical substances for example, photocatalytic substance
- it can be used as various light emitting elements including such an ultraviolet light emitting phosphor. Further, it can be used as a light emitting device including the light emitting element.
- Example 1 Production of phosphor Using zinc oxide (ZnO) and aluminum oxide (Al 2 O 3 ) as raw materials, the ratio is such that the composition formula stoichiometrically represented by ZnAl 2 O 4 is obtained. Mixed. The mixed powder was fired at 1200 ° C. for 5 hours in an air atmosphere to obtain a sintered body.
- ZnO zinc oxide
- Al 2 O 3 aluminum oxide
- FIG. 1 shows the X-ray diffraction results obtained for the sintered body obtained above with an X-ray diffractometer whose source is FeK ⁇ . From the peak values obtained in FIG. 1, it was confirmed that ZnAl 2 O 4 was crystallized.
- the ultraviolet light emitting phosphor ZnAl 2 O 4 according to the present example obtained light in the deep ultraviolet region by vacuum ultraviolet excitation.
- a phosphor having an abundance ratio of aluminum element to zinc element in the crystal structure of ZnAl 2 O 4 of 2.1 to 2.3 as shown in FIG. It was confirmed that a particularly high emission intensity with a peak nearby was obtained.
- Example 2 (2-1) Addition of alkali metal halide
- the abundance ratio of aluminum element to zinc element in the crystal structure of ZnAl 2 O 4 is 2.1-2.
- lithium fluoride (LiF), potassium chloride (KCl), and lithium chloride (LiCl) which are halides of alkali metal elements, were added and fired to obtain a sintered body.
- the results of the emission intensity spectrum for the phosphor having an abundance ratio of aluminum to zinc of 2.2 in the crystal structure of ZnAl 2 O 4 are shown in the following table and FIGS. 5 and 6.
- As reference data, for a phosphor in which the abundance ratio of aluminum element to zinc element in the crystal structure of ZnAl 2 O 4 is 2.0 and 2.2, and no halide of an alkali metal element is added The result of the obtained emission intensity spectrum is also shown.
- the results of the emission intensity spectrum for the phosphor having an abundance ratio of aluminum to zinc of 2.3 in the crystal structure of ZnAl 2 O 4 are shown in the following table and FIGS. 7 and 8.
- As reference data, for a phosphor in which the abundance ratio of aluminum element to zinc element in the crystal structure of ZnAl 2 O 4 is 2.0 and 2.2, and no halide of an alkali metal element is added The result of the obtained emission intensity spectrum is also shown.
- each phosphor according to Example 2 obtained by adding and firing an alkali metal element halide is high as shown in Example 1 by containing the alkali metal element. While maintaining the emission intensity, the emission with the peak wavelength region shifted to around 260 nm was obtained. From this, ultraviolet rays having a wavelength near 260 nm exhibiting an excellent bactericidal effect were obtained with high emission intensity, and by containing an alkali metal element, a strong bactericidal effect can be exhibited and useful as a bactericidal application. It was confirmed that the property is high.
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Abstract
Description
ノロウイルスあるいはカンジタ等の真菌類の殺菌や無害化に有効であり、遺伝子の耐性化を伴わないクリーン殺菌として水や動植物の殺菌、病院や家庭での空気殺菌や器具殺菌に有効であるばかりでなく、難分解物質の分解や化学物質の合成等への応用、医療応用など広い分野での活用が期待されている。このような産業上の高いニーズを背景として、紫外線発光を呈することのできる発光体の開発及び改良が進められている。
(1-1)蛍光体の製造
原材料に酸化亜鉛(ZnO)及び酸化アルミニウム(Al2O3)を用いて、化学量論的にZnAl2O4で表される組成式になるような割合に混合した。混合した粉体を大気雰囲気下で1200℃で5時間焼成して焼結体を得た。
上記で得られた焼結体に対して、線源がFeKαのX線回折装置で取得したX線回折結果を図1に示す。図1で得られたピーク値から、確かにZnAl2O4が結晶化していることが確認された。
上記と同じ製造方法で、ZnAl2O4結晶構造中のZnに対するAlの存在比率が1.6~2.3となるように製造し、以下の表に示す6種類のサンプル(サンプル番号1~6)を得た。以下の表では得られた発光強度を積分強度として示すと共に、得られた発光強度スペクトルの結果を図2に示す。図2の発光強度スペクトルのグラフでは、横軸に波長(nm)、縦軸に発光強度(a.u.)を示している。
(2-1)アルカリ金属元素のハロゲン化物の添加
上記の実施例1と同じ製造方法に従って、さらに、ZnAl2O4の結晶構造中における亜鉛元素に対するアルミニウム元素の存在比率が2.1~2.3の蛍光体に対して、アルカリ金属元素のハロゲン化物であるフッ化リチウム(LiF)、塩化カリウム(KCl)、塩化リチウム(LiCl)を添加して焼成して焼結体を得た。
ZnAl2O4の結晶構造中における亜鉛元素に対するアルミニウム元素の存在比率が2.1の蛍光体に対する発光強度スペクトルの結果を以下の表ならびに図3及び図4に示す。参考データとして、ZnAl2O4の結晶構造中における亜鉛元素に対するアルミニウム元素の存在比率が2.0及び2.1の蛍光体であって、アルカリ金属元素のハロゲン化物を添加しない蛍光体に対して得られた発光強度スペクトルの結果も示す。
Claims (8)
- 亜鉛元素、アルミニウム元素、及び酸素元素から構成されるZnAl2O4で表される蛍光体であって、真空紫外線を照射し、当該真空紫外線の照射により励起されて紫外線を発光することを特徴とする
紫外線発光蛍光体。 - 請求項1に記載の紫外線発光蛍光体において、
ZnAl2O4の結晶構造を構成する各構成元素の含有率が、Zn:Al:O=x:y:z (但し、2x≦y、2≦y≦4、3≦z≦4)であることを特徴とする
紫外線発光蛍光体。 - 請求項1または請求項2に記載の紫外線発光蛍光体において、
ZnAl2O4の結晶構造中における亜鉛元素に対するアルミニウム元素の存在比率が2より大きいことを特徴とする
紫外線発光蛍光体。 - 請求項1~3のいずれかに記載の紫外線発光蛍光体において、
アルカリ金属元素を含有することを特徴とする
紫外線発光蛍光体。 - 請求項1~4のいずれかに記載の紫外線発光蛍光体を用いることを特徴とする
発光素子。 - 請求項5に記載の発光素子を備えることを特徴とする
発光装置。 - 亜鉛元素、アルミニウム元素、及び酸素元素から構成されるZnAl2O4で表される蛍光体であって、真空紫外線を照射し、当該真空紫外線の照射により励起されて紫外線を発光する紫外線発光蛍光体の製造方法であって、
アルカリ金属元素のハロゲン化物を添加して焼成することを含む
紫外線発光蛍光体の製造方法。 - 請求項7に記載の紫外線発光蛍光体の製造方法において、
前記アルカリ金属元素のハロゲン化物を1~10重量%添加することを特徴とする
紫外線発光蛍光体の製造方法。
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JP2019038244A (ja) * | 2017-08-23 | 2019-03-14 | 株式会社デンソーウェーブ | 情報記録方法および情報読み出し方法 |
JP2019133729A (ja) * | 2018-02-02 | 2019-08-08 | 株式会社デンソーウェーブ | 情報記録方法、情報読み出し方法およびアルミナ蛍光体 |
JP2020534705A (ja) * | 2017-09-21 | 2020-11-26 | ヘレーウス ノーブルライト ゲゼルシャフト ミット ベシュレンクテル ハフツングHeraeus Noblelight GmbH | スペクトル分析装置用の広帯域の半導体ベースのuv光源 |
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JP2019038244A (ja) * | 2017-08-23 | 2019-03-14 | 株式会社デンソーウェーブ | 情報記録方法および情報読み出し方法 |
JP2020534705A (ja) * | 2017-09-21 | 2020-11-26 | ヘレーウス ノーブルライト ゲゼルシャフト ミット ベシュレンクテル ハフツングHeraeus Noblelight GmbH | スペクトル分析装置用の広帯域の半導体ベースのuv光源 |
JP2019133729A (ja) * | 2018-02-02 | 2019-08-08 | 株式会社デンソーウェーブ | 情報記録方法、情報読み出し方法およびアルミナ蛍光体 |
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