WO2012095920A1 - 紫外発光材料とその製造方法およびこれを用いた発光素子 - Google Patents
紫外発光材料とその製造方法およびこれを用いた発光素子 Download PDFInfo
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- WO2012095920A1 WO2012095920A1 PCT/JP2011/006550 JP2011006550W WO2012095920A1 WO 2012095920 A1 WO2012095920 A1 WO 2012095920A1 JP 2011006550 W JP2011006550 W JP 2011006550W WO 2012095920 A1 WO2012095920 A1 WO 2012095920A1
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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
- C09K11/62—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing gallium, indium or thallium
- C09K11/621—Chalcogenides
- C09K11/623—Chalcogenides with zinc or cadmium
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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
- C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
- C09K11/701—Chalcogenides
- C09K11/703—Chalcogenides with zinc or cadmium
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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
- C09K11/641—Chalcogenides
- C09K11/642—Chalcogenides with zinc or cadmium
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- 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
- H01L33/02—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 bodies
- H01L33/26—Materials of the light emitting region
- H01L33/28—Materials of the light emitting region containing only elements of group II and group VI of the periodic system
- H01L33/285—Materials of the light emitting region containing only elements of group II and group VI of the periodic system characterised by the doping materials
Definitions
- the present invention relates to a material that emits light in the ultraviolet region, in particular, an ultraviolet light-emitting material mainly composed of zinc oxide and a method for producing the same.
- the present invention also relates to a light emitting element using the ultraviolet light emitting material.
- zinc oxide has been known as a self-activated phosphor expressed by ZnO: Zn and having a broad emission wavelength having a peak near 500 nm, and is a green light emitting phosphor material for a fluorescent display tube excited by an electron beam. It is used as.
- ZnO: Zn phosphor the ratio of Zn and O deviates from 1, and excess Zn is contained, and it is considered that interstitial zinc or oxygen vacancies contribute to the green light emission.
- Zinc oxide is a compound semiconductor with a forbidden band of 3.4 eV, and can be used for phosphor excitation light sources and light emitting diode (LED) applications as a material capable of emitting light in the ultraviolet region by transition between bands. Is also strongly expected. However, actual zinc oxide tends to cause the above-described interstitial zinc or oxygen vacancies, and it is relatively easy to emit light in the green to blue region, but only light that is very weak in the ultraviolet region has been obtained.
- an object of the present invention is to provide a zinc oxide-based ultraviolet light emitting material that exhibits strong light emission in the ultraviolet region and a light emitting device using the same.
- One embodiment of the present invention includes zinc and oxygen as main components, Including at least one element selected from the group consisting of aluminum, gallium, and indium as the first subcomponent, and phosphorus as the second subcomponent; It is an ultraviolet light emitting material exhibiting n-type conductivity.
- one embodiment of the present invention reacts a zinc source, an oxygen source; at least one first sub-element source selected from the group consisting of aluminum, gallium, and indium; and a phosphorus source Including steps,
- the first subcomponent element source and the phosphorus source are compounds containing the first subcomponent element and phosphorus.
- a raw material containing zinc oxide at least one first subcomponent element source selected from the group consisting of aluminum, gallium, and indium; and a phosphorus source in a neutral atmosphere or It is a manufacturing method of said ultraviolet luminescent material heat-processed in a reducing atmosphere.
- an embodiment of the present invention is a light-emitting element having the above-described ultraviolet light-emitting material and a material exhibiting p-type conductivity bonded to the ultraviolet light-emitting material.
- a zinc oxide-based ultraviolet light emitting material exhibiting strong light emission in the ultraviolet region and a light emitting device using the same.
- Measurement diagram of emission spectrum of zinc oxide used for ultraviolet light emitting material and raw material of one embodiment of the present invention The figure which shows typically schematic structure of the light emitting element concerning one embodiment of this invention.
- One embodiment of the present invention includes zinc and oxygen as main components, Including at least one element selected from the group consisting of aluminum, gallium, and indium as the first subcomponent, and phosphorus as the second subcomponent; It is an ultraviolet light emitting material exhibiting n-type conductivity.
- the total amount of aluminum, gallium, and indium is 0.03 at% or more and 3.0 at% or less with respect to zinc.
- the amount of phosphorus is 0.03 at% or more and 3.0 at% or less with respect to zinc.
- the first subcomponent is gallium.
- the ultraviolet light emitting material further contains tungsten as a third subcomponent.
- the amount of tungsten is 0.01 at% or more and 1.0 at% or less with respect to zinc.
- Another embodiment of the present invention includes reacting a zinc source, an oxygen source; at least one first subelement source selected from the group consisting of aluminum, gallium, and indium; and a phosphorus source,
- the first subcomponent element source and the phosphorus source are compounds containing the first subcomponent element and phosphorus.
- the compound containing the first subcomponent element and phosphorus is a phosphide of the first subcomponent element.
- the compound containing the first subcomponent element and phosphorus is a phosphate of the first subcomponent element.
- a raw material containing zinc oxide at least one first sub-component element source selected from the group consisting of aluminum, gallium, and indium; Or it is the manufacturing method of said ultraviolet luminescent material heat-processed in a reducing atmosphere.
- Another embodiment of the present invention is a light emitting element having the above ultraviolet light emitting material and a material exhibiting p-type conductivity bonded to the ultraviolet light emitting material.
- the junction is made by placing the other on one of the ultraviolet light emitting material and the material exhibiting p-type conductivity.
- the material exhibiting p-type conductivity is a nitride containing gallium as a main component.
- the ultraviolet light emitting material in the present invention refers to a material having an emission peak wavelength of 400 nm or less.
- the required first subcomponent is at least one selected from the group consisting of aluminum, gallium, and indium.
- the green light emission of a zinc oxide will be suppressed and ultraviolet light emission will be improved.
- the electrical resistivity of zinc oxide is reduced, and remarkable n-type conductivity is exhibited. This is presumably because a part of the divalent zinc site of zinc oxide is replaced with trivalent aluminum, gallium, and indium, whereby a donor level is formed in the forbidden band directly under the conductor. Therefore, at least a part of aluminum, gallium, and indium needs to be substituted with zinc, and a simple mixture with zinc oxide does not show an effect of improving ultraviolet light emission luminance.
- gallium is the easiest to replace zinc, and aluminum and indium are difficult to replace. Accordingly, gallium is most likely to have an effect, and gallium is most desirable in terms of characteristics.
- aluminum is the cheapest in terms of cost, and gallium and indium are rare and expensive compared to aluminum. Therefore, aluminum is most desirable in terms of cost. Compared to gallium and aluminum, using indium has less merit.
- the second subcomponent phosphorus is used in combination with the above first subcomponent to dramatically improve the ultraviolet light emission luminance.
- the mechanism for improving the luminous brightness of phosphorus is not clear, but the addition of phosphorus alone has little effect on improving the brightness, and the addition of phosphorus tends to promote the substitution of aluminum, gallium, and indium to Zn sites. Therefore, it is possible to prevent electrical neutral damage caused by the substitution of aluminum, gallium, and indium at the Zn site by substituting the oxygen site of ZnO as phosphorus as an anion. It is considered that the substitution of gallium and indium is promoted and the ultraviolet emission luminance is improved.
- the main components must be zinc and oxygen.
- the ultraviolet light emitting material containing zinc as a main component means that zinc is 80% or more, more preferably 90% or more of the cation component element, and the ultraviolet light emitting material contains oxygen as a main component.
- oxygen means that oxygen is 80% or more, more preferably 90% or more of the anion component element.
- the amount of the first subcomponent (the total amount of aluminum, gallium, and indium) is desirably 0.03 at% or more and 3.0 at% or less with respect to zinc.
- the amount of the first subcomponent is preferably 0.03 at% or more and 3.0 at% or less with respect to zinc.
- the effect is not significant when the amount is less than 0.03 at%, and the amount of the first subcomponent exceeds 3.0 at%. This is because no further improvement in luminance is recognized and is wasted. However, even if it is less than 0.03 at% or more than 3.0 at%, the luminance is higher than when not used. Note that the amount of the first subcomponent does not specifically represent the amount of substitution of the zinc site of zinc oxide, but is the amount contained in the finally obtained ultraviolet light emitting material.
- the desirable amount of phosphorus is 0.03 at% or more and 3.0 at% or less with respect to zinc, and the reason why this range is desirable is the same. From the above considerations, it is desirable that phosphorus be as much as the first subcomponent, but there is no direct evidence that phosphorus is actually replacing the oxygen site of zinc oxide. Since the obtained ultraviolet light emitting material exhibits n-type conductivity, the amount of phosphorus taken into the crystal structure of zinc oxide is considered to be less than that of the first subcomponent.
- the ultraviolet light-emitting material further contains tungsten as the third subcomponent.
- the presence of tungsten further improves the luminance of ultraviolet light emission.
- the mechanism for improving the brightness by tungsten is not clear at present.
- Tungsten oxide is also known as an additive that has the effect of improving the luminance of green light emission and preventing the deterioration of luminance even in the ZnO: Zn phosphor that emits green light. It is thought to prevent contamination by gas and moisture.
- the present invention suppresses green light emission and improves ultraviolet light emission, the effect is completely opposite.
- the effect of tungsten is contaminated by carbon dioxide and moisture as in the green emission of ZnO: Zn. It shows that it is different from the mechanism that prevents the problem.
- tungsten is a metal with a maximum value of six valences and an expensive number, and its valence is likely to fluctuate, and at the same time has a high diffusion rate, so it works as an oxygen amount regulator.
- tungsten oxide has a high diffusion rate and, like alkali metal oxides such as lithium oxide, sodium oxide, and potassium oxide, is an impurity that suppresses ultraviolet light emission by being substituted and dissolved in zinc oxide. By forming the compound easily, substitution solid solution in zinc oxide is prevented.
- the amount of tungsten is desirably 0.01 at% or more and 1.0 at% or less with respect to zinc. This is because the effect is not remarkable when the content is less than 0.01 at%, and when the content exceeds 1.0 at%, the ultraviolet light emission luminance starts to decrease and is wasted. It is considered that the reason why the luminance decreases when exceeding 1.0 at% is that tungsten is easily concentrated on the surface.
- the ultraviolet light-emitting material of the present invention may contain zinc, oxygen, the first subcomponent, the second subcomponent, and the optional third subcomponent, but within the range that does not impair the characteristics. It is also possible to include these components.
- magnesium oxide dissolves in a small amount in zinc oxide and has the effect of increasing its band gap (that is, shifting the emission wavelength to the short wavelength side), but this zinc oxide-magnesium oxide solid solution system is also effective.
- the ultraviolet light-emitting material of the present invention may contain magnesium instead of a part of zinc, and at this time, a cation component combining zinc and magnesium becomes a main component.
- the ultraviolet light emitting material of the present invention exhibits strong light emission in the ultraviolet region.
- it can be manufactured without using special equipment and hydrogen that may ignite, which is necessary in the prior art, and it is also advantageous in terms of manufacturing because of its high productivity and safety. It is also advantageous in terms of cost.
- ultraviolet light emission it is possible to obtain a light emission luminance of 15 times or more, or even 300 times or more that of normal zinc oxide (zinc oxide not subjected to heat treatment).
- the ultraviolet light-emitting material of the present invention is a zinc oxide-based material, but its electrical resistivity is one digit to several digits lower than that of ordinary zinc oxide, so that it is suitable for application to a light-emitting element.
- the ultraviolet light emitting material of the present invention can be produced by reacting a zinc source, an oxygen source; at least one first subcomponent element source selected from the group consisting of aluminum, gallium, and indium; and a phosphorus source. It can.
- the reaction method include a solid phase method, a liquid phase method, and a gas phase method.
- the solid phase method is a method in which raw material powders (metal oxide, metal carbonate, etc.) containing each element source are mixed and heat-treated at a temperature of a certain level or more to react.
- liquid phase method a solution containing each element source is prepared, and then the solid phase is precipitated, or after applying this solution on the substrate, it is dried and subjected to heat treatment or the like at a temperature of a certain level or more. It is a method to do.
- the vapor phase method is a method for obtaining a thin film solid phase by a method such as vapor deposition, sputtering, or CVD.
- any of the above-described methods can be used.
- the luminescent material is used in a powder form, it is usually a solid phase that is relatively low in production cost and easy to produce in large quantities. The method is preferred.
- the ultraviolet light emitting material of the present invention When synthesizing the ultraviolet light emitting material of the present invention by the solid phase method, it is necessary to react the mixture of raw materials by heat treatment. Also, even when synthesized by a liquid phase method or a gas phase method, it is often better to perform heat treatment in order to improve the crystallinity and further improve the ultraviolet emission luminance. At this time, if the heat treatment is performed in an oxygen-rich atmosphere, the ultraviolet light emission intensity is difficult to be improved. For this reason, it is desirable to perform heat treatment in a neutral atmosphere such as nitrogen gas, argon gas, helium gas, and not in an oxidizing atmosphere containing a large amount of oxygen. .
- the concentration of oxygen contained in the atmosphere is preferably 100 ppm or less, and more preferably 10 ppm or less.
- neutral atmosphere gas especially nitrogen gas
- the powder is preliminarily molded and heat-treated, it can be made into a sintered body.
- the effect of improving the ultraviolet emission luminance can be obtained due to the presence of subcomponents.
- zinc oxide ZnO zinc hydroxide Zn (OH) 2 , zinc carbonate ZnCO 3 or the like may be used as a starting material for the zinc source and oxygen source, and generally ZnO Good.
- an aluminum source, a gallium source, an indium source, and a tungsten source may be oxides, hydroxides, carbonates, and the like, respectively, and generally oxides.
- the source of phosphorus is a problem.
- a general phosphorus oxide, P 2 O 5 is highly hygroscopic and reacts violently with moisture, so that it is difficult to use.
- a salt such as a phosphate such as diammonium hydrogen phosphate and ammonium dihydrogen phosphate may be used. When these ammonium salts are heated, ammonia and water are released at a low temperature to become P 2 O 5 , so that the same effect as using P 2 O 5 directly can be obtained.
- the phosphorus oxide itself is sublimable, and if heated to react with ZnO, it may sublime before the reaction, and the desired material composition is obtained. Hateful.
- a method in which phosphorus is excessively added in an excessive amount or a zinc phosphate that is a compound of phosphorus and zinc may be synthesized in advance.
- a more desirable method is a method using a compound containing the first subcomponent element and phosphorus as the first subcomponent element source and the phosphorus source.
- a phosphide of the first subcomponent element (aluminum phosphide AlP, gallium phosphide GaP, indium phosphide InP) can be used.
- these phosphides are generally expensive and there is a risk of reacting with moisture to generate highly toxic hydrogen phosphide. Therefore, as a more desirable compound, a phosphate of the first subcomponent element (aluminum phosphate, gallium phosphate, indium phosphate) can be used.
- the luminance is remarkably improved even with a relatively small addition amount. This is presumably because the evaporation of phosphorus is suppressed and the presence of phosphorus in the nearest vicinity of aluminum, gallium, and indium promotes the solid solution in ZnO.
- an ultraviolet light emitting material with high luminance can be manufactured. According to the production method, it is possible to produce an ultraviolet light emitting material without using special equipment and hydrogen that may ignite, which is necessary in the prior art, which is advantageous in terms of mass productivity and safety. But it is advantageous.
- EL light emitting device using the ultraviolet light emitting material of the present invention Next, a light emitting element using the ultraviolet light emitting material of the present invention will be described. Since the material of the present invention exhibits n-type conductivity as described above, EL light emission can be obtained by forming a pn junction by bonding with a material exhibiting p-type conductivity and passing a current in the positive direction. .
- any material for bonding to the material of the present invention to form a light emitting element any material can be used as long as it exhibits p-type conductivity.
- the present invention The light emission transmitted through either the p-type conductive material or the p-type conductive material used is observed. At this time, if a material having a band gap larger than that of the material of the present invention is used as a material exhibiting p-type conductivity, it is preferable that EL light emission is not absorbed.
- Materials having a larger band gap than the material of the present invention and exhibiting p-type conductivity include various materials such as NiO, Zn 1-x Mg x O: N, SrCu 2 O 2 , and nitrides mainly composed of gallium. Materials.
- the hole concentration and hole mobility be high, and practically, it can be stably produced, has little toxicity, etc., and also has chemical stability after production. High is good.
- NiO is difficult to increase the hole mobility, and toxicity has been pointed out.
- a ZnO-based material such as Zn 1-x Mg x O: N doped with nitrogen has not yet been established with sufficient technology and is difficult to be stably manufactured. Those containing monovalent Cu such as SrCu 2 O 2 and alkaline earths also have a problem of poor chemical stability.
- Nitride containing gallium as a main component is a material obtained by making GaN, GaInN, AlGaN, AlGaInN, etc. p-type by Mg doping or the like.
- the light emitting device of the present invention is not limited to these.
- a pin junction configuration in which a very thin i layer having a relatively high electrical insulating property is sandwiched between pn junction interfaces, which is also used in general light emitting diodes, may be used.
- any generally used method can be applied as a method for forming a pn junction or a pin junction.
- a material having p-type conductivity prepared in advance is prepared as a base, and the material of the present invention is formed thereon by a method such as a thin film or a thick film, and heat treatment or the like is further performed as necessary.
- the material of the present invention may be prepared as a substrate, and a material exhibiting p-type conductivity may be formed thereon by various methods, or similarly heat treatment or the like may be applied as necessary.
- the characteristics of the material of the present invention and the characteristics of a material exhibiting p-type conductivity may deteriorate.
- the material of the present invention when used as a base and a p-type material is formed thereon by a method such as sputtering, the light emission efficiency of the material of the present invention decreases due to sputtering damage. Even when post-treatment such as heat treatment is performed for the purpose of recovery of characteristics, the optimum treatment conditions do not always match between the n-type conductive material and the p-type conductive material. It's difficult to do.
- the light-emitting element of the present invention has a configuration in which the other is placed on one of the ultraviolet light-emitting material and the material exhibiting p-type conductivity and bonded. Things are desirable. With such a configuration, n-type and p-type materials can be prepared under conditions where the characteristics are the highest, and a light-emitting element with a simple structure and excellent ultraviolet emission characteristics can be provided. .
- FIG. 2 is a diagram schematically showing a schematic configuration of a light emitting device according to an embodiment of the present invention.
- the n-type portion 15 for example, Al is formed as the first electrode 11 on the ZnO-based ultraviolet light-emitting n-type conductive material 10 of the present invention.
- the p-type conductive material 13 is formed on the substrate 12, and Ni / Au is formed as the second electrode 14, for example.
- the light emitting element 1 an n-type portion 15 is formed on the p-type portion 16.
- the structure which mounts the p-type part 16 on the n-type part 15 is also possible.
- the element is likely to be separated between the n-type portion 15 and the p-type portion 16 by simple mounting.
- a method such as providing a thin adhesive layer may be used.
- the light-emitting element of the present invention emits intensely in the ultraviolet region, but of course, by combining this with a normal phosphor that absorbs ultraviolet light and emits light in the visible light region, an element that emits light in the visible region is obtained. Things are possible.
- Example 1 with respect to the ultraviolet light emitting material of the present invention, synthesis of the light emitting material of the present invention by a solid phase method using zinc oxide raw material powder, other metal element oxide raw material powder and diammonium hydrogen phosphate And its characteristic evaluation is described.
- ZnO powder with a purity of 5N, Al 2 O 3 , Ga 2 O 3 , In 2 O 3 and WO 3 powders with a purity of 4N, and reagent-grade diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 was prepared.
- FIG. 1 as an example of the emission spectrum, No. 0 and 17, that is, ZnO powder used as a raw material, and No. 1 of the present invention. 17 shows an emission spectrum of the powder (measured by switching the sensitivity of the measuring instrument because there is too much difference between the emission luminances of the two).
- light emission having a peak in the vicinity of 380 nm is ultraviolet light emission which is an object of the present invention.
- light emission near 500 nm is green light emission.
- the conventional zinc oxide in FIG. 1 exhibits both ultraviolet light emission and green light emission, but has a low ultraviolet light emission luminance.
- the material of the present invention exhibits much stronger ultraviolet light emission and substantially no green light emission.
- No. 15 has an ultraviolet emission luminance that is about four times higher, and it can be seen that the luminance improvement effect is high when Ga and P are contained at the same time. Furthermore, since hydrogen gas is a dangerous gas, it is an advantage that the luminance can be increased without using hydrogen gas.
- the desirable range of Ga content is 0.03 at% or more and 3.0 at% or less. Since Al and In have the same effects as Ga (improvement of ultraviolet emission luminance and suppression of green emission luminance), the total amount of aluminum, gallium and indium is 0.03 at% or more and 3.0 at% with respect to zinc. % Or less is desirable.
- No. 30 to 34 show the results of adding W to Ga and P. No. No W added.
- an increase in ultraviolet emission intensity was further observed.
- the effect is No. with a W amount of 0.01 at% or more.
- No. 31-34 was remarkable, but No. with W amount exceeding 1.0 at%.
- the effect was saturated. Therefore, since addition exceeding 1.0 at% is wasted, the desirable range of W amount was 0.01 at% or more and 1.0 at% or less.
- a composition comprising zinc oxide as a main component and a small amount of at least one selected from the group consisting of gallium oxide, aluminum oxide and indium oxide, and phosphorus, that is, the main component
- a composition containing zinc and oxygen, at least one element selected from the group consisting of aluminum, gallium, and indium as the first subcomponent, and phosphorus as the second subcomponent A dramatic improvement was possible. Furthermore, by adding tungsten to these, the characteristics could be improved.
- Example 2 shows the effect of changing the raw materials in the production of the ultraviolet light emitting material of the present invention.
- ZnO powder having the same purity as in Example 1 was used.
- a gallium phosphide GaP powder was prepared by pulverizing a GaP single crystal as a gallium source and a phosphorus source.
- reagent-grade gallium nitrate and diammonium hydrogen phosphate were prepared, and each was made into an aqueous solution and then mixed to form a precipitate.
- the precipitate was washed well with water and dried at 150 ° C. to obtain a powder.
- this powder was amorphous according to X-ray diffraction, it was dehydrated by heating and became crystalline gallium phosphate at 850 ° C., so that it was amorphous gallium phosphate hydrate.
- gallium phosphide powder Using gallium phosphide powder, amorphous gallium phosphate hydrate, Ga 2 O 3 having a purity of 4N as in Example 1 and reagent-grade diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 as raw materials did.
- Example 3 describes a light-emitting element using the ultraviolet light-emitting material of the present invention.
- No. of Example 1 Using the same raw material mixed powders that produced 17 powders, these were pressure-molded in a mold, then fired under the same conditions as in Example 1, and a sintered body sample having a diameter of about 10 mm and a thickness of about 1 mm, No. . 39 was obtained.
- this sample was measured for PL light emission in the same manner as in Example 1, ultraviolet light emission with substantially the same intensity was observed at the same wavelength as that of the powder.
- a light emitting device shown in FIG. 2 was produced using this sintered body. That is, Al was vapor-deposited as a first electrode on one side of the obtained sintered body to form an n-type part.
- a commercially available member is prepared in which a p-type GaN layer is formed by doping Mg on a sapphire substrate using MOCVD, and Ni / Au is used as a second electrode on the p-GaN layer. To form a p-type part.
- n-type part and the p-type part thus obtained were brought into contact with each other by applying pressure to form a light-emitting element having a mounting structure.
- the ultraviolet light emitting material and light emitting element of the present invention can be widely applied to phosphor excitation materials, LED elements, inorganic EL displays, and the like.
Abstract
Description
第1の副成分としてアルミニウム、ガリウム、およびインジウムからなる群より選ばれる少なくとも1種の元素、ならびに
第2の副成分としてリンを含み、
n型導電性を示す紫外発光材料である。
前記第1の副成分元素源および前記リン源として、第1の副成分元素とリンを含む化合物を用いる、上記の紫外発光材料の製造方法である。
第1の副成分としてアルミニウム、ガリウム、およびインジウムからなる群より選ばれる少なくとも1種の元素、ならびに
第2の副成分としてリンを含み、
n型導電性を示す紫外発光材料である。
前記第1の副成分元素源および前記リン源として、第1の副成分元素とリンを含む化合物を用いる、上記の紫外発光材料の製造方法である。
発明者等は、通常のZnO粉末に、種々の化合物粉末を単独、あるいは複合添加し、種々の条件下で熱処理してその発光特性を評価した結果、複数の特定の元素の添加により、水素を用いなくとも、無添加のZnO粉末に比較し、紫外発光が飛躍的に改善された材料が得られる事を見出した。
本発明の紫外発光材料は、亜鉛源、酸素源;アルミニウム、ガリウム、およびインジウムからなる群より選ばれる少なくとも1種の第1の副成分元素源;ならびにリン源を反応させることにより製造することができる。反応方法としては、固相法、液相法、気相法が挙げられる。
次に本発明の紫外発光材料を用いた発光素子について述べる。本発明の材料は上述したようにn型導電性を示すため、p型導電性を示す材料と接合する事によってpn接合を形成し、正方向に電流を流せば、EL発光を得る事が出来る。
Claims (13)
- 主成分として亜鉛と酸素、
第1の副成分としてアルミニウム、ガリウム、およびインジウムからなる群より選ばれる少なくとも1種の元素、ならびに
第2の副成分としてリンを含み、
n型導電性を示す紫外発光材料。 - アルミニウムとガリウムとインジウムの合計量が、亜鉛に対して0.03at%以上3.0at%以下である、請求項1記載の紫外発光材料。
- リンの量が、亜鉛に対して0.03at%以上3.0at%以下である、請求項1記載の紫外発光材料。
- 前記第1の副成分がガリウムである、請求項1記載の紫外発光材料。
- 第3の副成分としてさらにタングステンを含む、請求項1記載の紫外発光材料。
- タングステンの量が、亜鉛に対して0.01at%以上1.0at%以下である、請求項5記載の紫外発光材料。
- 亜鉛源、酸素源;アルミニウム、ガリウム、およびインジウムからなる群より選ばれる少なくとも1種の第1の副成分元素源;ならびにリン源を反応させる工程を含み、
前記第1の副成分元素源および前記リン源として、第1の副成分元素とリンを含む化合物を用いる、請求項1記載の紫外発光材料の製造方法。 - 前記第1の副成分元素とリンを含む化合物が、第1の副成分元素のリン化物である、請求項7記載の製造方法。
- 前記第1の副成分元素とリンを含む化合物が、第1の副成分元素のリン酸塩である、請求項7記載の製造方法。
- 酸化亜鉛;アルミニウム、ガリウム、およびインジウムからなる群より選ばれる少なくとも1種の第1の副成分元素源;ならびにリン源を含む原料を、中性雰囲気下または還元性雰囲気下で熱処理する、請求項1記載の紫外発光材料の製造方法。
- 請求項1に記載の紫外発光材料、および当該紫外発光材料に接合されたp型導電性を示す材料を有する発光素子。
- 前記接合が、前記紫外発光材料と前記p型導電性を示す材料の一方の上に他方を載置してなされている、請求項11記載の発光素子。
- 前記p型導電性を示す材料は、ガリウムを主成分とした窒化物である、請求項11記載の発光素子。
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US20130161561A1 (en) * | 2011-09-27 | 2013-06-27 | Panasonic Corporation | Method of producing ultraviolet light emitting phosphor material |
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JP6188150B2 (ja) | 2011-11-09 | 2017-08-30 | Necエナジーデバイス株式会社 | リチウムイオン二次電池用負極、その製造方法およびリチウムイオン二次電池 |
DE102013002119A1 (de) * | 2013-02-08 | 2014-08-28 | Rheinmetall Waffe Munition Gmbh | Explosivstofffreies Geschoss zur Erzeugung einer thermischen Signatur |
EP2997108B1 (en) * | 2013-05-13 | 2020-02-05 | Signify Holding B.V. | Uv radiation device |
JP2015194731A (ja) * | 2014-03-27 | 2015-11-05 | パナソニックIpマネジメント株式会社 | 光学材料、光学素子及び複合光学素子 |
CN104090433A (zh) * | 2014-06-19 | 2014-10-08 | 合肥鑫晟光电科技有限公司 | 阵列基板及显示装置 |
US9711255B2 (en) * | 2015-01-16 | 2017-07-18 | Stanley Electric Co., Ltd | Ultraviolet-emitting material and ultraviolet light source |
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CN103003391B (zh) | 2015-06-17 |
US8845929B2 (en) | 2014-09-30 |
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