JP2018002492A - Wavelength conversion member and light-emitting device using the same - Google Patents
Wavelength conversion member and light-emitting device using the same Download PDFInfo
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Abstract
Description
本発明は、発光ダイオード（ＬＥＤ：Light Emitting Diode）やレーザーダイオード（ＬＤ：Laser Diode）等の発光素子の発する光の波長を別の波長に変換するための波長変換部材に関するものである。 The present invention relates to a wavelength conversion member for converting the wavelength of light emitted from a light emitting element such as a light emitting diode (LED) or a laser diode (LD) to another wavelength.
近年、蛍光ランプや白熱灯に変わる次世代の光源として、低消費電力、小型軽量、容易な光量調節という観点から、ＬＥＤやＬＤを用いた光源に対する注目が高まってきている。そのような次世代光源の一例として、例えば特許文献１には、青色光を出射するＬＥＤ上に、ＬＥＤからの光の一部を吸収して黄色光に変換する波長変換部材が配置された光源が開示されている。この光源は、ＬＥＤから出射された青色光と、波長変換部材から出射された黄色光との合成光である白色光を発する。 In recent years, as a next-generation light source that replaces fluorescent lamps and incandescent lamps, attention has been focused on light sources using LEDs and LDs from the viewpoints of low power consumption, small size and light weight, and easy light quantity adjustment. As an example of such a next-generation light source, for example, Patent Document 1 discloses a light source in which a wavelength conversion member that absorbs part of light from an LED and converts it into yellow light is disposed on an LED that emits blue light. Is disclosed. This light source emits white light which is a combined light of blue light emitted from the LED and yellow light emitted from the wavelength conversion member.
波長変換部材としては、従来、樹脂マトリクス中に無機蛍光体を分散させたものが用いられている。しかしながら、当該波長変換部材を用いた場合、ＬＥＤからの光により樹脂が劣化し、光源の輝度が低くなりやすいという問題がある。特に、ＬＥＤが発する熱や高エネルギーの短波長（青色〜紫外）光によって樹脂マトリクスが劣化し、変色や変形を起こすという問題がある。 As the wavelength conversion member, a material in which an inorganic phosphor is dispersed in a resin matrix has been conventionally used. However, when the wavelength conversion member is used, there is a problem that the resin is deteriorated by the light from the LED and the luminance of the light source tends to be lowered. In particular, there is a problem that the resin matrix deteriorates due to heat emitted from the LED or high energy short wavelength (blue to ultraviolet) light, causing discoloration or deformation.
そこで、樹脂に代えてガラスマトリクス中に無機蛍光体を分散固定した完全無機固体からなる波長変換部材が提案されている（例えば、特許文献２及び３参照）。当該波長変換部材は、母材となるガラスがＬＥＤチップの熱や照射光により劣化しにくく、変色や変形といった問題が生じにくいという特徴を有している。 Therefore, a wavelength conversion member made of a completely inorganic solid in which an inorganic phosphor is dispersed and fixed in a glass matrix instead of a resin has been proposed (see, for example, Patent Documents 2 and 3). The wavelength conversion member has a feature that glass as a base material is not easily deteriorated by heat of the LED chip or irradiation light, and problems such as discoloration and deformation hardly occur.
なお、一般照明、特殊照明等の用途においては、高い演色性が求められるため、赤色や緑色といった比較的耐熱性の低い無機蛍光体を使用する必要がある。そこで、ガラス組成中にアルカリ金属酸化物を含有させることにより、ガラス粉末の軟化点を低下させた波長変換部材が提案されている（例えば、特許文献４参照）。当該波長変換部材は、比較的低温での焼成により製造可能なため、焼成時における無機蛍光体の劣化を抑制することができる。 In applications such as general lighting and special lighting, high color rendering properties are required, and therefore it is necessary to use inorganic phosphors with relatively low heat resistance such as red and green. Then, the wavelength conversion member which reduced the softening point of glass powder by containing an alkali metal oxide in a glass composition is proposed (for example, refer patent document 4). Since the wavelength conversion member can be manufactured by firing at a relatively low temperature, deterioration of the inorganic phosphor during firing can be suppressed.
特許文献２及び３に記載の波長変換部材は、光取出し効率に劣り、発光効率が低いという問題がある。一方、特許文献４に記載の波長変換部材は、発光強度が経時的に低下（温度消光）しやすいという問題がある。近年のＬＥＤやＬＤ等の光源のさらなる出力増大に伴って、発光強度の経時的な低下はますます顕著になっている。 The wavelength conversion members described in Patent Documents 2 and 3 have problems that the light extraction efficiency is inferior and the light emission efficiency is low. On the other hand, the wavelength conversion member described in Patent Document 4 has a problem in that the emission intensity is likely to decrease over time (temperature quenching). With the further increase in output of light sources such as LEDs and LDs in recent years, the decrease in light emission intensity over time has become more prominent.
以上に鑑み、本発明は、ＬＥＤやＬＤの光を照射した場合に、発光強度が高く、かつ、経時的な発光強度の低下の少ない波長変換部材及びそれを用いてなる発光デバイスを提供することを目的とする。 In view of the above, the present invention provides a wavelength conversion member having a high emission intensity and a little decrease in emission intensity over time when irradiated with light from an LED or LD, and a light emitting device using the same. With the goal.
本発明の波長変換部材は、ガラスマトリクス中に無機蛍光体が分散してなる波長変換部材であって、ガラスマトリクスが、モル％で、ＳｉＯ２ ３０〜７５％、Ｂ２Ｏ３ ０〜１５％、Ａｌ２Ｏ３ ０〜１５％、Ｌｉ２Ｏ ０〜５％、Ｎａ２Ｏ ０〜５％、Ｋ２Ｏ ０〜５％、Ｌｉ２Ｏ＋Ｎａ２Ｏ＋Ｋ２Ｏ ０〜５％、ＭｇＯ ０〜３５％、ＣａＯ ０〜３５％、ＳｒＯ ０〜３５％、ＢａＯ ０〜３５％、ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ ０．１〜４５％、ＴｉＯ２ ０．１〜１５、Ｌａ２Ｏ３ ０〜２０、及びＺｎＯ ０〜５％を含有することを特徴とする。ここで、「○＋○＋・・・」は該当する各成分の合量を意味する。 The wavelength conversion member of the present invention is a wavelength conversion member in which an inorganic phosphor is dispersed in a glass matrix, and the glass matrix is mol%, SiO 2 30 to 75%, B 2 O 3 0 to 15%. Al 2 O 3 0-15%, Li 2 O 0-5%, Na 2 O 0-5%, K 2 O 0-5%, Li 2 O + Na 2 O + K 2 O 0-5%, MgO 0-35 %, CaO 0-35%, SrO 0-35%, BaO 0-35%, MgO + CaO + SrO + BaO 0.1-45%, TiO 2 0.1-15, La 2 O 3 0-20, and ZnO 0-5% It is characterized by containing. Here, “◯ + ○ +...” Means the total amount of each corresponding component.
本発明者は、波長変換部材における発光強度の経時的な低下が、特にガラス組成中に含まれるアルカリ金属成分が原因であることを突き止めた。そのメカニズムは以下のように推察される。 The present inventor has found that the decrease in light emission intensity with time in the wavelength conversion member is caused by an alkali metal component contained in the glass composition. The mechanism is guessed as follows.
組成中にアルカリ金属元素を含有するガラスマトリクスに励起光が照射されると、励起光のエネルギーにより、ガラスマトリクス中の酸素イオンの最外殻に存在する電子が励起され、酸素イオンから離れる。その一部は、ガラスマトリクス中のアルカリイオンと結合して着色中心を形成する（ここで、アルカリイオンが抜けた後には空孔が形成される）。一方、電子が抜けることにより生成した正孔はガラスマトリクス中を移動し、一部はアルカリイオンが抜けた後に形成された空孔に捕えられて着色中心を形成する。ガラスマトリクス中に形成されたこれらの着色中心が励起光や蛍光の吸収源となり、波長変換部材の発光強度が低下すると考えられる。さらに、無機蛍光体から発生する熱（波長変換ロスが原因となって発生する熱）によって、ガラスマトリクス中の電子、正孔、アルカリイオンの移動が活発になる傾向がある。それにより、着色中心の形成が加速され、発光強度が低下しやすくなる。 When a glass matrix containing an alkali metal element in the composition is irradiated with excitation light, electrons existing in the outermost shell of oxygen ions in the glass matrix are excited by the energy of the excitation light and are separated from the oxygen ions. Some of them combine with alkali ions in the glass matrix to form colored centers (here, vacancies are formed after the alkali ions are eliminated). On the other hand, the holes generated by the escape of electrons move in the glass matrix, and some of them are captured by the vacancies formed after the alkali ions have been removed to form a colored center. It is considered that these colored centers formed in the glass matrix serve as an absorption source of excitation light and fluorescence, and the emission intensity of the wavelength conversion member decreases. Furthermore, the movement of electrons, holes, and alkali ions in the glass matrix tends to be activated by heat generated from the inorganic phosphor (heat generated due to wavelength conversion loss). Thereby, the formation of the coloring center is accelerated, and the light emission intensity is likely to decrease.
本発明の波長変換部材では、ガラスマトリクス中におけるアルカリ金属成分の含有量を上記の通り極力少なくすることにより、着色中心の発生を抑制している。また、ガラスマトリクス中におけるアルカリ金属成分の含有量を極力少なくすることにより、高温高湿下における経時的なガラスマトリクス劣化も抑制することができる。 In the wavelength conversion member of the present invention, the generation of the coloring center is suppressed by reducing the content of the alkali metal component in the glass matrix as much as possible. Further, by reducing the content of the alkali metal component in the glass matrix as much as possible, deterioration of the glass matrix over time under high temperature and high humidity can be suppressed.
なお一般に、無機蛍光体はガラスよりも屈折率が高い場合が多い。例えば、ＹＡＧ蛍光体は屈折率（ｎｄ）が１．８３である。波長変換部材において、無機蛍光体とガラスマトリクスの屈折率差が大きいと、無機蛍光体とガラスマトリクスの界面で励起光が散乱されやすくなる。その結果、無機蛍光体に対する励起光の照射効率が高くなり、蛍光の発生量が多くなる。しかしながら、発生した蛍光も散乱を受けやすくなるため、波長変換部材の出射方向における光取出し量が低下し、発光効率が低下する傾向がある。本発明の波長変換部材は、ガラスマトリクス中にＴｉＯ２を必須成分として含有するため、ガラスマトリクスの屈折率が比較的高いという特徴を有している。そのため、無機蛍光体とガラスマトリクスの屈折率差を小さくすることができ、発光効率を向上させることができる。 In general, inorganic phosphors often have a higher refractive index than glass. For example, the YAG phosphor has a refractive index (nd) of 1.83. In the wavelength conversion member, if the refractive index difference between the inorganic phosphor and the glass matrix is large, excitation light is likely to be scattered at the interface between the inorganic phosphor and the glass matrix. As a result, the irradiation efficiency of the excitation light with respect to the inorganic phosphor increases, and the amount of fluorescence generated increases. However, since the generated fluorescence is also susceptible to scattering, the light extraction amount in the emission direction of the wavelength conversion member is reduced, and the light emission efficiency tends to be reduced. Since the wavelength conversion member of the present invention contains TiO 2 as an essential component in the glass matrix, it has a feature that the refractive index of the glass matrix is relatively high. Therefore, the refractive index difference between the inorganic phosphor and the glass matrix can be reduced, and the light emission efficiency can be improved.
なお、本発明の波長変換部材におけるガラスマトリクスはアルカリ土類酸化物（ＭｇＯ、ＣａＯ、ＳｒＯ、ＢａＯ）を必須成分として含有する。アルカリ土類酸化物は、アルカリ金属イオンのように波長変換部材における発光強度の経時的な低下に影響を与えることなく、ガラスマトリクスの軟化点を低下させることができる。これにより、製造時における焼成により無機蛍光体の特性が劣化することを抑制できる。 In addition, the glass matrix in the wavelength conversion member of this invention contains alkaline-earth oxide (MgO, CaO, SrO, BaO) as an essential component. Alkaline earth oxides can lower the softening point of the glass matrix without affecting the temporal decrease in light emission intensity in the wavelength conversion member, unlike alkali metal ions. Thereby, it can suppress that the characteristic of an inorganic fluorescent substance deteriorates by baking at the time of manufacture.
本発明の波長変換部材において、ガラスマトリクスの屈折率が１．６〜２．０であることが好ましい。 In the wavelength conversion member of the present invention, the glass matrix preferably has a refractive index of 1.6 to 2.0.
本発明の波長変換部材において、ガラスマトリクスの軟化点が６００〜１１００℃であることが好ましい。 In the wavelength conversion member of the present invention, the glass matrix preferably has a softening point of 600 to 1100 ° C.
本発明の波長変換部材は、無機蛍光体を０．０１〜７０質量％含有することが好ましい。 The wavelength conversion member of the present invention preferably contains 0.01 to 70% by mass of an inorganic phosphor.
本発明の波長変換部材において、無機蛍光体として、酸化物蛍光体、窒化物蛍光体、酸窒化物蛍光体、塩化物蛍光体、酸塩化物蛍光体、ハロゲン化物蛍光体、アルミン酸塩蛍光体、ハロリン酸塩化物蛍光体、硫化物蛍光体及び酸硫化物蛍光体からなる群より選択される少なくとも１種を使用することができる。 In the wavelength conversion member of the present invention, as the inorganic phosphor, oxide phosphor, nitride phosphor, oxynitride phosphor, chloride phosphor, acid chloride phosphor, halide phosphor, aluminate phosphor In addition, at least one selected from the group consisting of halophosphate chloride phosphors, sulfide phosphors and oxysulfide phosphors can be used.
本発明の波長変換部材は、粉末焼結体からなることが好ましい。 The wavelength conversion member of the present invention is preferably made of a powder sintered body.
本発明の発光デバイスは、上記の波長変換部材、及び、波長変換部材に励起光を照射する光源を備えてなることを特徴とする。 The light-emitting device of the present invention includes the above-described wavelength conversion member and a light source that irradiates the wavelength conversion member with excitation light.
本発明の車載用照明は、上記の発光デバイスを用いたことを特徴とする。 The in-vehicle illumination of the present invention is characterized by using the above light emitting device.
本発明の車載用照明は、前照灯として使用されることを特徴とする。 The vehicle-mounted illumination of the present invention is used as a headlamp.
本発明の波長変換部材は、ＬＥＤやＬＤの光を照射した場合に、発光強度が高く、かつ、経時的な発光強度の低下が少ない。そのため、本発明の波長変換部材を用いてなる発光デバイスは長期信頼性に優れ、車載用照明、特に車載用前照灯として好適である。 When the wavelength conversion member of the present invention is irradiated with light from an LED or LD, the emission intensity is high, and the decrease in emission intensity over time is small. Therefore, the light-emitting device using the wavelength conversion member of the present invention is excellent in long-term reliability, and is suitable as a vehicle-mounted illumination, particularly a vehicle-mounted headlamp.
本発明の波長変換部材は、ガラスマトリクス中に無機蛍光体が分散してなるものである。ガラスマトリクスは、モル％で、ＳｉＯ２ ３０〜７５％、Ｂ２Ｏ３ ０〜１５％、Ａｌ２Ｏ３ ０〜１５％、Ｌｉ２Ｏ ０〜５％、Ｎａ２Ｏ ０〜５％、Ｋ２Ｏ ０〜５％、Ｌｉ２Ｏ＋Ｎａ２Ｏ＋Ｋ２Ｏ ０〜５％、ＭｇＯ ０〜３５％、ＣａＯ ０〜３５％、ＳｒＯ ０〜３５％、ＢａＯ ０〜３５％、ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ ０．１〜４５％、ＴｉＯ２ ０．１〜１５、Ｌａ２Ｏ３ ０〜２０、及びＺｎＯ ０〜５％を含有する。このようにガラス組成範囲を限定した理由を以下に説明する。なお、以下の説明において、特に断りのない限り「％」は「モル％」を意味する。 The wavelength conversion member of the present invention is obtained by dispersing an inorganic phosphor in a glass matrix. Glass matrix, in mol%, SiO 2 30~75%, B 2 O 3 0~15%, Al 2 O 3 0~15%, Li 2 O 0~5%, Na 2 O 0~5%, K 2 O 0~5%, Li 2 O + Na 2 O + K 2 O 0~5%, MgO 0~35%, CaO 0~35%, SrO 0~35%, BaO 0~35%, MgO + CaO + SrO + BaO 0.1~45% , TiO 2 0.1~15, La 2 O 3 0~20, and containing 0 to 5% ZnO. The reason for limiting the glass composition range as described above will be described below. In the following description, “%” means “mol%” unless otherwise specified.
ＳｉＯ２はガラスネットワークを形成する成分である。ＳｉＯ２の含有量は３０〜７５％であり、３１〜７０％であることが好ましい。ＳｉＯ２の含有量が少なすぎると、耐候性や機械的強度が低下する傾向がある。一方、ＳｉＯ２の含有量が多すぎると、焼結温度が高温になるため、波長変換部材製造時に無機蛍光体が劣化しやすくなる。 SiO 2 is a component that forms a glass network. The content of SiO 2 is 30 to 75%, and preferably 31 to 70%. When the content of SiO 2 is too small, weather resistance and mechanical strength tends to decrease. On the other hand, if the content of SiO 2 is too large, the sintering temperature becomes high, so that the inorganic phosphor is easily deteriorated during the production of the wavelength conversion member.
Ｂ２Ｏ３は溶融温度を低下させて溶融性を著しく改善する成分である。Ｂ２Ｏ３の含有量は０〜１５％であり、０．１〜１３％であることが好ましい。Ｂ２Ｏ３の含有量が多すぎると、耐候性が低下しやすくなる。 B 2 O 3 is a component that significantly improves the meltability by lowering the melting temperature. The content of B 2 O 3 is 0 to 15%, preferably 0.1 to 13%. If the B 2 O 3 content is too large, the weather resistance tends to lower.
Ａｌ２Ｏ３は耐候性や機械的強度を向上させる成分である。Ａｌ２Ｏ３の含有量は０〜１５％であり、０．１〜１０％であることが好ましい。Ａｌ２Ｏ３の含有量が多すぎると、溶融性が低下する傾向がある。 Al 2 O 3 is a component that improves weather resistance and mechanical strength. The content of Al 2 O 3 is 0 to 15%, preferably 0.1 to 10%. When the content of Al 2 O 3 is too large, there is a tendency that the melting is lowered.
Ｌｉ２Ｏ、Ｎａ２Ｏ及びＫ２Ｏは溶融温度を低下させて溶融性を改善するとともに、軟化点を低下させる成分である。しかしながら、これらの成分の含有量が多すぎると、耐候性が低下しやすくなり、かつ、ＬＥＤやＬＤの光照射により発光強度が経時的に低下しやすくなる。よって、Ｌｉ２Ｏ＋Ｎａ２Ｏ＋Ｋ２Ｏの含有量は０〜５％であり、０〜４％であることが好ましい。また、Ｌｉ２Ｏ、Ｎａ２Ｏ及びＫ２Ｏの各成分の含有量は各々０〜５％であり、各々０〜４％であることが好ましい。Ｌｉ２Ｏ、Ｎａ２Ｏ、Ｋ２Ｏを含有させる場合は、２種以上、特に３種を混合して用いることが好ましい。このようにすれば、混合アルカリ効果により、ＬＥＤやＬＤの光照射による発光強度の経時的な低下を抑制することが可能になる。 Li 2 O, Na 2 O and K 2 O are components that lower the melting temperature to improve the meltability and lower the softening point. However, when there is too much content of these components, a weather resistance will fall easily and emission intensity will fall easily with time by light irradiation of LED and LD. Therefore, the content of Li 2 O + Na 2 O + K 2 O is 0 to 5%, and preferably 0 to 4%. Further, Li 2 O, content of each component of Na 2 O and K 2 O are each 0 to 5%, it is preferable that each 0-4%. When Li 2 O, Na 2 O, or K 2 O is contained, it is preferable to use a mixture of two or more, particularly three. If it does in this way, it will become possible to suppress the time-dependent fall of the emitted light intensity by light irradiation of LED and LD by the mixed alkali effect.
ＭｇＯ、ＣａＯ、ＳｒＯ及びＢａＯは溶融温度を低下させて溶融性を改善し、軟化点を低下させる成分である。なお、既述の通り、これらの成分はアルカリ金属成分と異なり、波長変換部材における発光強度の経時的な低下に影響を与えない。ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯの含有量は０．１〜４５％であり、０．１〜４３％、特に１〜４０％であることが好ましい。ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯの含有量が少なすぎると、軟化点が低下しにくくなる。一方、ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯの含有量が多すぎると、耐候性が低下しやすくなる。なお、ＭｇＯ、ＣａＯ、ＳｒＯ及びＢａＯの各成分の含有量は各々０〜３５％であり、０．１〜３３％、特に１〜３０％であることが好ましい。これらの成分の含有量が多すぎると、耐候性が低下する傾向がある。 MgO, CaO, SrO and BaO are components that lower the melting temperature to improve the meltability and lower the softening point. As described above, these components, unlike the alkali metal component, do not affect the temporal decrease in the emission intensity of the wavelength conversion member. The content of MgO + CaO + SrO + BaO is 0.1 to 45%, preferably 0.1 to 43%, particularly preferably 1 to 40%. When there is too little content of MgO + CaO + SrO + BaO, a softening point will become difficult to fall. On the other hand, when there is too much content of MgO + CaO + SrO + BaO, a weather resistance will fall easily. The content of each component of MgO, CaO, SrO and BaO is 0 to 35%, preferably 0.1 to 33%, particularly preferably 1 to 30%. When there is too much content of these components, there exists a tendency for a weather resistance to fall.
ＴｉＯ２は屈折率を上昇させる成分である。ＴｉＯ２の含有量は０．１〜１５％であり、１〜１４％であることが好ましい。ＴｉＯ２の含有量が少なすぎると、ガラスマトリクスを高屈折率化しにくくなる。その結果、ガラスマトリクスと無機蛍光体の屈折率差が大きくなって、励起光の散乱が過剰になり、散乱損失となって発光効率が低下する傾向がある。一方、ＴｉＯ２の含有量が多すぎると、Ｔｉを核とする結晶が析出しやすくなり、耐失透性が低下する傾向がある。 TiO 2 is a component that increases the refractive index. The content of TiO 2 is 0.1 to 15%, preferably 1 to 14%. When the content of TiO 2 is too small, so the glass matrix hardly high refractive streamlining. As a result, the refractive index difference between the glass matrix and the inorganic phosphor becomes large, the excitation light is excessively scattered, and the light emission efficiency tends to decrease due to scattering loss. On the other hand, when the content of TiO 2 is too large, crystals having Ti as a nucleus are likely to precipitate, and the devitrification resistance tends to be lowered.
Ｌａ２Ｏ３は屈折率を上昇させる成分である。Ｌａ２Ｏ３の含有量は０〜２０％であり、好ましくは０．１〜１５％である。Ｌａ２Ｏ３の含有量が多すぎると、Ｌａを核とする結晶が析出しやすくなり、耐失透性が低下する傾向がある。 La 2 O 3 is a component that increases the refractive index. The content of La 2 O 3 is 0 to 20%, preferably 0.1 to 15%. When the content of La 2 O 3 is too large, crystal of La core tends to precipitate, the devitrification resistance tends to decrease.
ＺｎＯは溶融温度を低下させて溶融性を改善する成分である。ＺｎＯの含有量は０〜５％であり、０〜４．５％であることが好ましく、０〜４％であることがより好ましい。ＺｎＯの含有量が多すぎると、耐候性が低下する傾向がある。 ZnO is a component that improves the meltability by lowering the melting temperature. The content of ZnO is 0 to 5%, preferably 0 to 4.5%, and more preferably 0 to 4%. When there is too much content of ZnO, there exists a tendency for a weather resistance to fall.
また、上記成分以外にも、本発明の効果を損なわない範囲で種々の成分を含有させることができる。例えば、Ｐ２Ｏ５、Ｔａ２Ｏ５、ＴｅＯ２、Ｎｂ２Ｏ５、Ｇｄ２Ｏ３、Ｙ２Ｏ３、ＣｅＯ２、Ｓｂ２Ｏ３、ＳｎＯ２、Ｂｉ２Ｏ３、Ａｓ２Ｏ３及びＺｒＯ２等を各々１５％以下、さらには１０％以下、特に５％以下、合量で３０％以下の範囲で含有させてもよい。またＦを含有させることもできる。Ｆは軟化点を低減する効果があるため、着色中心形成の原因の１つであるアルカリ金属成分の代わりに含有させることにより、低軟化点を維持したまま、発光強度の経時的な低下を抑制することができる。Ｆの含有量はアニオン％で０〜１０％、０〜８％、特に０．１〜５％であることが好ましい。 In addition to the above components, various components can be contained within a range not impairing the effects of the present invention. For example, P 2 O 5 , Ta 2 O 5 , TeO 2 , Nb 2 O 5 , Gd 2 O 3 , Y 2 O 3 , CeO 2 , Sb 2 O 3 , SnO 2 , Bi 2 O 3 , As 2 O 3 And ZrO 2 may be contained in a range of 15% or less, further 10% or less, particularly 5% or less, and a total amount of 30% or less. Moreover, F can also be contained. Since F has the effect of reducing the softening point, by containing it instead of the alkali metal component, which is one of the causes of the formation of the coloring center, the temporal decrease in emission intensity is suppressed while maintaining the low softening point. can do. The content of F is preferably 0 to 10%, 0 to 8%, particularly 0.1 to 5% in terms of anion%.
Ｆｅ及びＣｒは可視光透過率を低下させ、発光強度低下の原因となる成分である。よって、Ｆｅの含有量は１０００ｐｐｍ以下、特に５００ｐｐｍ以下であることが好ましい。また、Ｃｒの含有量は５００ｐｐｍ以下、特に１００ｐｐｍ以下であることであることが好ましい。ただし、ガラス中にＦｅ及びＣｒを含有しないようにするためには、高価な高純度原料を使用する必要があるため、製造コストが高騰しやすくなる。よって、製造コストを低減する観点からは、Ｆｅ及びＣｒの含有量は各々５ｐｐｍ以上、特に１０ｐｐｍ以上であることが好ましい。 Fe and Cr are components that decrease the visible light transmittance and cause a decrease in emission intensity. Therefore, the Fe content is preferably 1000 ppm or less, particularly preferably 500 ppm or less. The Cr content is preferably 500 ppm or less, particularly 100 ppm or less. However, in order not to contain Fe and Cr in the glass, it is necessary to use an expensive high-purity raw material, so that the manufacturing cost is likely to increase. Therefore, from the viewpoint of reducing the manufacturing cost, the Fe and Cr contents are each preferably 5 ppm or more, particularly preferably 10 ppm or more.
ガラスマトリクスの軟化点は６００〜１１００℃、６３０〜１０５０℃、特に６５０〜１０００℃であることが好ましい。ガラスマトリクスの軟化点が低すぎると、機械的強度及び耐候性が低下しやすくなる。一方、軟化点が高すぎると焼結温度も高くなるため、製造時の焼成工程において無機蛍光体が劣化しやすくなる。 The softening point of the glass matrix is preferably 600 to 1100 ° C, 630 to 1050 ° C, particularly 650 to 1000 ° C. If the softening point of the glass matrix is too low, the mechanical strength and weather resistance tend to be lowered. On the other hand, if the softening point is too high, the sintering temperature also increases, so that the inorganic phosphor is likely to be deteriorated in the firing step during production.
本発明における無機蛍光体は、酸化物蛍光体（ＹＡＧ蛍光体等のガーネット系蛍光体を含む）、窒化物蛍光体、酸窒化物蛍光体、塩化物蛍光体、酸塩化物蛍光体、ハロゲン化物蛍光体、アルミン酸塩蛍光体、ハロリン酸塩化物蛍光体、硫化物蛍光体及び酸硫化物蛍光体からなる群より選択される少なくとも１種である。これらの無機蛍光体のうち、酸化物蛍光体、窒化物蛍光体及び酸窒化物蛍光体は耐熱性が高く、焼成時に比較的劣化しにくいため好ましい。なお、窒化物蛍光体及び酸窒化物蛍光体は、近紫外〜青の励起光を緑〜赤という幅広い波長領域に変換し、しかも発光強度も比較的高いという特徴を有している。そのため、窒化物蛍光体及び酸窒化物蛍光体は、特に白色ＬＥＤ素子用波長変換部材に用いられる無機蛍光体として有効である。無機蛍光体から発生した熱がガラスマトリクスに伝導するのを抑制するため、被覆処理された無機蛍光体を用いても良い。これにより、ガラスマトリクス中の電子、正孔、アルカリイオンの移動の活発化を抑制し、結果として着色中心の形成を抑制することができる。被覆材としては酸化物が好ましい。 Inorganic phosphors in the present invention include oxide phosphors (including garnet phosphors such as YAG phosphors), nitride phosphors, oxynitride phosphors, chloride phosphors, acid chloride phosphors, halides It is at least one selected from the group consisting of phosphors, aluminate phosphors, halophosphate phosphors, sulfide phosphors and oxysulfide phosphors. Among these inorganic phosphors, oxide phosphors, nitride phosphors, and oxynitride phosphors are preferable because they have high heat resistance and are relatively difficult to deteriorate during firing. Nitride phosphors and oxynitride phosphors are characterized by converting near-ultraviolet to blue excitation light into a wide wavelength range from green to red and having a relatively high emission intensity. Therefore, nitride phosphors and oxynitride phosphors are particularly effective as inorganic phosphors used for wavelength conversion members for white LED elements. In order to suppress conduction of heat generated from the inorganic phosphor to the glass matrix, a coated inorganic phosphor may be used. Thereby, activation of the movement of the electron in the glass matrix, a hole, and an alkali ion can be suppressed, and formation of a coloring center can be suppressed as a result. An oxide is preferable as the coating material.
上記無機蛍光体としては、波長３００〜５００ｎｍに励起帯を有し波長３８０〜７８０ｎｍに発光ピークを有するもの、特に青色（波長４４０〜４８０ｎｍ）、緑色（波長５００〜５４０ｎｍ）、黄色（波長５４０〜５９５ｎｍ）、赤色（波長６００〜７００ｎｍ）に発光するものが挙げられる。 Examples of the inorganic phosphor include those having an excitation band at a wavelength of 300 to 500 nm and an emission peak at a wavelength of 380 to 780 nm, particularly blue (wavelength 440 to 480 nm), green (wavelength 500 to 540 nm), yellow (wavelength 540 to 540). 595 nm) and red light (wavelength 600 to 700 nm).
波長３００〜４４０ｎｍの紫外〜近紫外の励起光を照射すると青色の発光を発する無機蛍光体としては、（Ｓｒ，Ｂａ）ＭｇＡｌ１０Ｏ１７：Ｅｕ２＋、（Ｓｒ，Ｂａ）３ＭｇＳｉ２Ｏ８：Ｅｕ２＋等が挙げられる。 Examples of inorganic phosphors that emit blue light when irradiated with ultraviolet to near-ultraviolet excitation light having a wavelength of 300 to 440 nm include (Sr, Ba) MgAl 10 O 17 : Eu 2+ , (Sr, Ba) 3 MgSi 2 O 8 : Eu 2+ and the like can be mentioned.
波長３００〜４４０ｎｍの紫外〜近紫外の励起光を照射すると緑色の蛍光を発する無機蛍光体としては、ＳｒＡｌ２Ｏ４：Ｅｕ２＋、ＳｒＢａＳｉＯ４：Ｅｕ２＋、Ｙ３（Ａｌ，Ｇｄ）５Ｏ１２：Ｃｅ３＋、ＳｒＳｉＯＮ：Ｅｕ２＋、ＢａＭｇＡｌ１０Ｏ１７：Ｅｕ２＋，Ｍｎ２＋、Ｂａ２ＭｇＳｉ２Ｏ７：Ｅｕ２＋、Ｂａ２ＳｉＯ４：Ｅｕ２＋、Ｂａ２Ｌｉ２Ｓｉ２Ｏ７：Ｅｕ２＋、ＢａＡｌ２Ｏ４：Ｅｕ２＋等が挙げられる。 As inorganic phosphors that emit green fluorescence when irradiated with ultraviolet to near-ultraviolet excitation light having a wavelength of 300 to 440 nm, SrAl 2 O 4 : Eu 2+ , SrBaSiO 4 : Eu 2+ , Y 3 (Al, Gd) 5 O 12 : Ce 3+ , SrSiON: Eu 2+ , BaMgAl 10 O 17 : Eu 2+ , Mn 2+ , Ba 2 MgSi 2 O 7 : Eu 2+ , Ba 2 SiO 4 : Eu 2+ , Ba 2 Li 2 Si 2 O 7 : Eu 2+ , BaAl 2 O 4: Eu 2+ and the like.
波長４４０〜４８０ｎｍの青色の励起光を照射すると緑色の蛍光を発する無機蛍光体としては、ＳｒＡｌ２Ｏ４：Ｅｕ２＋、ＳｒＢａＳｉＯ４：Ｅｕ２＋、Ｙ３（Ａｌ，Ｇｄ）５Ｏ１２：Ｃｅ３＋、ＳｒＳｉＯＮ：Ｅｕ２＋、β−ＳｉＡｌＯＮ：Ｅｕ２＋等が挙げられる。 As an inorganic phosphor that emits green fluorescence when irradiated with blue excitation light having a wavelength of 440 to 480 nm, SrAl 2 O 4 : Eu 2+ , SrBaSiO 4 : Eu 2+ , Y 3 (Al, Gd) 5 O 12 : Ce 3+ , SrSiON: Eu 2+ , β-SiAlON: Eu 2+ and the like.
波長３００〜４４０ｎｍの紫外〜近紫外の励起光を照射すると黄色の蛍光を発する無機蛍光体としては、Ｌａ３Ｓｉ６Ｎ１１:Ｃｅ３＋等が挙げられる。 Examples of the inorganic phosphor that emits yellow fluorescence when irradiated with excitation light having a wavelength of 300 to 440 nm include La 3 Si 6 N 11 : Ce 3+ .
波長４４０〜４８０ｎｍの青色の励起光を照射すると黄色の蛍光を発する無機蛍光体としては、Ｙ３（Ａｌ，Ｇｄ）５Ｏ１２：Ｃｅ３＋、Ｓｒ２ＳｉＯ４：Ｅｕ２＋が挙げられる。 Examples of the inorganic phosphor that emits yellow fluorescence when irradiated with blue excitation light having a wavelength of 440 to 480 nm include Y 3 (Al, Gd) 5 O 12 : Ce 3+ and Sr 2 SiO 4 : Eu 2+ .
波長３００〜４４０ｎｍの紫外〜近紫外の励起光を照射すると赤色の蛍光を発する無機蛍光体としては、ＣａＧａ２Ｓ４：Ｍｎ２＋、ＭｇＳｒ３Ｓｉ２Ｏ８：Ｅｕ２＋，Ｍｎ２＋、Ｃａ２ＭｇＳｉ２Ｏ７：Ｅｕ２＋，Ｍｎ２＋等が挙げられる。 Upon irradiation with ultraviolet to near-ultraviolet excitation light of wavelength 300~440nm The inorganic phosphor that emits red fluorescence, CaGa 2 S 4: Mn 2+ , MgSr 3 Si 2 O 8: Eu 2+, Mn 2+, Ca 2 MgSi 2 O 7 : Eu 2+ , Mn 2+ and the like.
波長４４０〜４８０ｎｍの青色の励起光を照射すると赤色の蛍光を発する無機蛍光体としては、ＣａＡｌＳｉＮ３：Ｅｕ２＋、ＣａＳｉＮ３：Ｅｕ２＋、（Ｃａ，Ｓｒ）２Ｓｉ５Ｎ８：Ｅｕ２＋、α−ＳｉＡｌＯＮ：Ｅｕ２＋等が挙げられる。 As inorganic phosphors that emit red fluorescence when irradiated with blue excitation light having a wavelength of 440 to 480 nm, CaAlSiN 3 : Eu 2+ , CaSiN 3 : Eu 2+ , (Ca, Sr) 2 Si 5 N 8 : Eu 2+ , α -SiAlON: Eu < 2+ > etc. are mentioned.
なお、励起光や発光の波長域に合わせて、複数の無機蛍光体を混合して用いてもよい。例えば、紫外域の励起光を照射して白色光を得る場合は、青色、緑色、黄色、赤色の蛍光を発する無機蛍光体を混合して使用すればよい。 A plurality of inorganic phosphors may be mixed and used in accordance with the wavelength range of excitation light or light emission. For example, when white light is obtained by irradiating ultraviolet excitation light, inorganic phosphors that emit blue, green, yellow, and red fluorescence may be mixed and used.
既述の通り、波長変換部材において無機蛍光体とガラスマトリクスの屈折率差が大きいと、波長変換部材の出射方向における光取出し量が低下し、発光効率が低下する傾向がある。よって、無機蛍光体とガラスマトリクスの屈折率差は０．３以下、０．２以下、特に０．１以下であることが好ましい。また、ガラスマトリクスの屈折率（ｎｄ）は１．６〜２．０、特に１．６５〜１．９５であることが好ましい。 As described above, if the refractive index difference between the inorganic phosphor and the glass matrix is large in the wavelength conversion member, the light extraction amount in the emission direction of the wavelength conversion member tends to decrease, and the light emission efficiency tends to decrease. Therefore, the refractive index difference between the inorganic phosphor and the glass matrix is preferably 0.3 or less, 0.2 or less, particularly 0.1 or less. The refractive index (nd) of the glass matrix is preferably 1.6 to 2.0, particularly 1.65 to 1.95.
波長変換部材の発光効率（ｌｍ／Ｗ）は、無機蛍光体の種類や含有量、さらには波長変換部材の厚み等によって変化する。無機蛍光体の含有量と波長変換部材の厚みは、発光効率が最適になるように適宜調整すればよい。無機蛍光体の含有量が多くなりすぎると、焼結しにくくなったり、気孔率が大きくなって、励起光が効率良く無機蛍光体に照射されにくくなったり、波長変換部材の機械的強度が低下する等の問題が生じるおそれがある。一方、無機蛍光体の含有量が少なすぎると、所望の発光強度を得ることが困難になる。このような観点から、本発明の波長変換部材における無機蛍光体の含有量は、０．０１〜７０質量％であることが好ましく、０．０５〜５０質量％であることがより好ましく、０．０８〜３０質量％であることがさらに好ましい。 The luminous efficiency (lm / W) of the wavelength conversion member varies depending on the type and content of the inorganic phosphor, the thickness of the wavelength conversion member, and the like. What is necessary is just to adjust suitably content of an inorganic fluorescent substance and the thickness of the wavelength conversion member so that luminous efficiency may become optimal. If the content of the inorganic phosphor becomes too large, it becomes difficult to sinter, the porosity increases, the excitation light is not easily irradiated to the inorganic phosphor, and the mechanical strength of the wavelength conversion member is lowered. There is a risk of problems such as On the other hand, if the content of the inorganic phosphor is too small, it becomes difficult to obtain a desired emission intensity. From such a viewpoint, the content of the inorganic phosphor in the wavelength conversion member of the present invention is preferably 0.01 to 70% by mass, more preferably 0.05 to 50% by mass, and More preferably, it is 08-30 mass%.
なお、波長変換部材において発生した蛍光を、励起光入射側へ反射させ、主に蛍光のみを外部に取り出すことを目的とした波長変換部材においては、上記の限りではなく、発光強度が最大になるように、無機蛍光体の含有量を多くする（例えば、３０〜８０質量％、さらには４０〜７５質量％）ことができる。 Note that the wavelength conversion member for the purpose of reflecting the fluorescence generated in the wavelength conversion member to the excitation light incident side and mainly taking out only the fluorescence to the outside is not limited to the above, and the emission intensity is maximized. Thus, content of inorganic fluorescent substance can be increased (for example, 30-80 mass%, Furthermore, 40-75 mass%).
本発明の波長変換部材には、無機蛍光体以外にも、アルミナ、シリカ、マグネシア等の光拡散材を合量で３０質量％まで含有していてもよい。 In addition to the inorganic phosphor, the wavelength conversion member of the present invention may contain a light diffusing material such as alumina, silica, or magnesia up to 30% by mass.
本発明の波長変換部材は粉末焼結体からなることが好ましい。具体的には、ガラス粉末と無機蛍光体粉末を含む混合粉末の焼結体からなることが好ましい。このようにすれば、ガラスマトリクス中に無機蛍光体が均一に分散した波長変換部材を容易に作製することが可能となる。 The wavelength conversion member of the present invention is preferably made of a powder sintered body. Specifically, it is preferably composed of a sintered body of a mixed powder containing glass powder and inorganic phosphor powder. In this way, it becomes possible to easily produce a wavelength conversion member in which an inorganic phosphor is uniformly dispersed in a glass matrix.
ガラス粉末の最大粒子径Ｄｍａｘは２００μｍ以下、１５０μｍ以下、特に１０５μｍ以下であることが好ましい。ガラス粉末の平均粒子径Ｄ５０は０．１μｍ以上、１μｍ以上、特に２μｍ以上であることが好ましい。ガラス粉末の最大粒子径Ｄｍａｘが大きすぎると、得られる波長変換部材において、励起光が散乱しにくくなり発光効率が低下しやすくなる。また、ガラス粉末の平均粒子径Ｄ５０が小さすぎると、得られる波長変換部材において、励起光が過剰に散乱して発光効率が低下しやすくなる。 The maximum particle diameter Dmax of the glass powder is preferably 200 μm or less, 150 μm or less, and particularly preferably 105 μm or less. Glass average particle diameter D 50 of the powder 0.1μm or more, 1 [mu] m or more, and particularly preferably 2μm or more. When the maximum particle diameter Dmax of the glass powder is too large, the excitation light is hardly scattered in the obtained wavelength conversion member, and the light emission efficiency tends to be lowered. When the average particle diameter D 50 of the glass powder is too small, in the wavelength conversion member obtained, luminous efficiency tends to decrease with the excitation light is excessively scattered.
なお、本発明において、最大粒子径Ｄｍａｘ及び平均粒子径Ｄ５０はレーザー回折法により測定した値を指す。 In the present invention, the maximum particle diameter D max and the average particle size D 50 refers to the value measured by a laser diffraction method.
ガラス粉末及び無機蛍光体を含む混合粉末の焼成温度は、ガラス粉末の軟化点±１５０℃以内、特にガラス粉末の軟化点±１００℃以内であることが好ましい。焼成温度が低すぎると、ガラス粉末が十分に流動せず、緻密な焼結体が得られにくい。一方、焼成温度が高すぎると、無機蛍光体成分がガラス中に溶出して発光強度が低下したり、無機蛍光体成分がガラス中に拡散することによりガラスが着色して発光強度が低下するおそれがある。 The firing temperature of the mixed powder containing the glass powder and the inorganic phosphor is preferably within the softening point ± 150 ° C. of the glass powder, and particularly within the softening point ± 100 ° C. of the glass powder. If the firing temperature is too low, the glass powder does not flow sufficiently and it is difficult to obtain a dense sintered body. On the other hand, if the firing temperature is too high, the inorganic phosphor component may elute in the glass and the emission intensity may decrease, or the inorganic phosphor component may diffuse into the glass and the glass may be colored to decrease the emission intensity. There is.
焼成は減圧雰囲気中で行うことが好ましい。具体的には、焼成中の雰囲気は１．０１３×１０５Ｐａ未満、１０００Ｐａ以下、特に４００Ｐａ以下であることが好ましい。それにより、波長変換部材中に残存する気泡の量を少なくすることができる。その結果、波長変換部材内の散乱因子を低減することができ、発光効率を向上させることができる。なお、焼成工程全体を減圧雰囲気中で行ってもよいし、例えば焼成工程のみを減圧雰囲気中で行い、その前後の昇温工程や降温工程を、減圧雰囲気ではない雰囲気（例えば大気圧下）で行ってもよい。 Firing is preferably performed in a reduced-pressure atmosphere. Specifically, the atmosphere during firing is preferably less than 1.013 × 10 5 Pa, 1000 Pa or less, particularly 400 Pa or less. Thereby, the amount of bubbles remaining in the wavelength conversion member can be reduced. As a result, the scattering factor in the wavelength conversion member can be reduced, and the luminous efficiency can be improved. In addition, you may perform the whole baking process in a pressure-reduced atmosphere, for example, only a baking process is performed in a pressure-reduced atmosphere, and the temperature raising process and temperature-falling process before and behind that are performed in the atmosphere (for example, under atmospheric pressure) which is not a pressure-reduced atmosphere. You may go.
本発明の波長変換部材の形状は特に制限されず、例えば、板状、柱状、半球状、半球ドーム状等、それ自身が特定の形状を有する部材だけでなく、ガラス基板やセラミック基板等の基材表面に形成された被膜状の焼結体等も含まれる。 The shape of the wavelength converting member of the present invention is not particularly limited, and is not limited to a member having a specific shape such as a plate shape, a columnar shape, a hemispherical shape, a hemispherical dome shape, or a glass substrate or a ceramic substrate. A film-like sintered body formed on the surface of the material is also included.
なお、波長変換部材表面に反射防止膜や微細凹凸構造層が設けられていてもよい。このようにすれば、波長変換部材表面での光反射率が低減して、光取出し効率が改善し、発光強度を向上させることができる。特にガラスマトリクスの屈折率が高い場合は、波長変換部材表面における光反射率が高くなる傾向があるため、表面に反射防止膜や微細凹凸構造層を設けることにより得られる効果が大きい。 An antireflection film or a fine concavo-convex structure layer may be provided on the surface of the wavelength conversion member. If it does in this way, the light reflectivity in the wavelength conversion member surface will reduce, light extraction efficiency will improve, and emitted light intensity can be raised. In particular, when the refractive index of the glass matrix is high, the light reflectance on the surface of the wavelength conversion member tends to be high, so that the effect obtained by providing an antireflection film or a fine concavo-convex structure layer on the surface is great.
反射防止膜としては酸化物、窒化物、フッ化物等からなる単層膜または多層膜（誘電体多層膜）が挙げられ、スパッタ法、蒸着法、コーティング法等により形成することができる。反射防止膜の光反射率は、波長３８０〜７８０ｎｍにおいて５％以下、４％以下、特に３％以下であることが好ましい。 Examples of the antireflection film include a single layer film or a multilayer film (dielectric multilayer film) made of oxide, nitride, fluoride, and the like, and can be formed by a sputtering method, a vapor deposition method, a coating method, or the like. The light reflectance of the antireflection film is preferably 5% or less, 4% or less, particularly 3% or less at a wavelength of 380 to 780 nm.
微細凹凸構造層としては、可視光の波長以下のサイズからなるモスアイ構造等が挙げられる。微細凹凸構造層の作製方法としては、ナノインプリント法やフォトリソグラフィ法が挙げられる。あるいは、サンドブラスト、エッチング、研磨等により波長変換部材表面を粗面化することにより微細凹凸構造層を形成することもできる。凹凸構造層の表面粗さＲａは０．００１〜０．３μｍ、０．００３〜０．２μｍ、特に０．００５〜０．１５μｍであることが好ましい。表面粗さＲａが小さすぎると、所望の反射防止効果が得られにくくなる。一方、表面粗さＲａが大きすぎると、光散乱が大きくなって、発光強度が低下しやすくなる。 Examples of the fine concavo-convex structure layer include a moth-eye structure having a size equal to or smaller than the wavelength of visible light. Examples of a method for producing the fine concavo-convex structure layer include a nanoimprint method and a photolithography method. Alternatively, the fine concavo-convex structure layer can be formed by roughening the surface of the wavelength conversion member by sandblasting, etching, polishing, or the like. The surface roughness Ra of the uneven structure layer is preferably 0.001 to 0.3 μm, 0.003 to 0.2 μm, and particularly preferably 0.005 to 0.15 μm. If the surface roughness Ra is too small, it becomes difficult to obtain a desired antireflection effect. On the other hand, if the surface roughness Ra is too large, light scattering increases and the light emission intensity tends to decrease.
図１に、本発明の発光デバイスの実施形態の一例を示す。図１に示すように、発光デバイス１は波長変換部材２及び光源３を備えてなる。光源３は、波長変換部材２に対して励起光Ｌ１を照射する。波長変換部材２に入射した励起光Ｌ１は、別の波長の蛍光Ｌ２に変換され、光源３とは反対側から出射する。この際、波長変換されずに透過した励起光Ｌ１と、蛍光Ｌ２との合成光を出射させるようにしてもよい。 In FIG. 1, an example of embodiment of the light-emitting device of this invention is shown. As shown in FIG. 1, the light emitting device 1 includes a wavelength conversion member 2 and a light source 3. The light source 3 irradiates the wavelength conversion member 2 with excitation light L1. The excitation light L1 incident on the wavelength conversion member 2 is converted into fluorescence L2 having a different wavelength and is emitted from the side opposite to the light source 3. At this time, the combined light of the excitation light L1 transmitted without being wavelength-converted and the fluorescence L2 may be emitted.
以下に、本発明を実施例に基づいて詳細に説明するが、本発明はこれらの実施例に限定されるものではない。 Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited to these examples.
（１）ガラス粉末の作製
表１〜３は実施例で使用するガラス粉末（試料１〜１６）及び比較例で使用するガラス粉末（試料１７、１８）を示している。
(1) Production of Glass Powder Tables 1 to 3 show the glass powder (samples 1 to 16) used in the examples and the glass powder (samples 17 and 18) used in the comparative examples.
表１〜３に示すガラス組成となるように原料を調合し、白金坩堝を用いて１２００〜１７００℃で１〜２時間溶融してガラス化した。溶融ガラスを一対の冷却ローラー間に流し出すことによりフィルム状に成形した。得られたフィルム状ガラス成形体をボールミルで粉砕した後、分級して平均粒子径Ｄ５０が２．５μｍのガラス粉末を得た。得られたガラス粉末につき、下記の方法により、屈折率、熱膨張係数、密度、歪点、徐冷点、軟化点及び耐候性を測定した。 Raw materials were prepared so as to have the glass compositions shown in Tables 1 to 3, and melted and vitrified at 1200 to 1700 ° C. for 1 to 2 hours using a platinum crucible. The molten glass was cast into a film by pouring between a pair of cooling rollers. The resulting film-like glass shaped material was ground in a ball mill, the average particle diameter D 50 and classified to obtain a glass powder 2.5 [mu] m. The obtained glass powder was measured for refractive index, thermal expansion coefficient, density, strain point, annealing point, softening point, and weather resistance by the following methods.
屈折率は、ヘリウムランプのｄ線（５８７．６ｎｍ）に対する測定値で示した。 The refractive index is indicated by the measured value for the d-line (587.6 nm) of the helium lamp.
熱膨張係数はディラトメーターを用いて３０〜３８０℃の範囲における値を測定した。 The coefficient of thermal expansion was measured in the range of 30 to 380 ° C. using a dilatometer.
密度はアルキメデス法により測定した。 The density was measured by the Archimedes method.
歪点、徐冷点及び軟化点はファイバーエロンゲーション法を用い、粘度がそれぞれ１０１４．５ｄＰａ・ｓ、１０１３．０ｄＰａ・ｓ及び１０７．６ｄＰａ・ｓとなる温度を採用した。 The strain point, annealing point, and softening point were measured using fiber elongation, and temperatures at which the viscosities were 10 14.5 dPa · s, 10 13.0 dPa · s, and 10 7.6 dPa · s, respectively, were adopted.
耐候性は次のようにして評価した。ガラス粉末を金型で加圧成型して直径１ｃｍの円柱状予備成型体を作製し、表１〜３に記載の焼成温度で焼成することにより円柱状の焼結体試料を得た。平山製作所製ＨＡＳＴ試験機ＰＣ−２４２ＨＳＲ２を用いて、試料を１２１℃、９５％ＲＨ、２気圧の条件下、３００時間保持し、表面を観察することによって耐候性を評価した。具体的には、光学顕微鏡観察（×５００）にて、試験前後で試料表面に変化がないものは「○」、試料表面にガラス成分が析出していたり、光沢が失われたりしたものを「×」として評価した。 The weather resistance was evaluated as follows. Glass powder was pressure-molded with a mold to prepare a cylindrical preform with a diameter of 1 cm, and fired at the firing temperature shown in Tables 1 to 3 to obtain a cylindrical sintered body sample. Using Hirayama Seisakusho HAST tester PC-242HSR2, the sample was held for 300 hours under the conditions of 121 ° C., 95% RH and 2 atm, and the weather resistance was evaluated by observing the surface. Specifically, in the observation with an optical microscope (× 500), “○” indicates that the sample surface does not change before and after the test, and “no” indicates that the glass component is deposited on the sample surface or the gloss is lost. “×” was evaluated.
（２）波長変換部材の作製
表４〜６は本発明の実施例（試料Ａ−１〜Ａ−１６）及び比較例（Ａ−１７、Ａ−１８）を示している。
(2) Production of Wavelength Conversion Member Tables 4 to 6 show Examples (Samples A-1 to A-16) and Comparative Examples (A-17, A-18) of the present invention.
表１〜３に記載の各ガラス粉末試料に、表４〜６に示す無機蛍光体粉末を所定の質量比で混合して混合粉末を得た。混合粉末を金型で加圧成型して直径１ｃｍの円柱状予備成型体を作製した。予備成型体を焼成した後、得られた焼結体に加工を施すことにより、１．２ｍｍ角、厚さ０．２ｍｍの板状の波長変換部材を得た。なお、焼成温度は、使用したガラス粉末に応じて、表１〜３に記載の焼成温度を採用した。 Inorganic phosphor powders shown in Tables 4 to 6 were mixed with each glass powder sample shown in Tables 1 to 3 at a predetermined mass ratio to obtain mixed powders. The mixed powder was pressure-molded with a mold to prepare a cylindrical preform with a diameter of 1 cm. After firing the preform, the obtained sintered body was processed to obtain a plate-like wavelength conversion member having a size of 1.2 mm square and a thickness of 0.2 mm. In addition, the calcination temperature of Tables 1-3 was employ | adopted for the calcination temperature according to the used glass powder.
上記の波長変換部材について全光束値を次のようにして求めた。まず、励起波長４４５ｎｍの光源上に波長変換部材を設置し、周囲を白色樹脂で封止した後、積分球内で波長変換部材上面から発せられる光のエネルギー分布スペクトルを測定した。次に、得られたスペクトルに標準比視感度を掛け合わせて全光束値を算出した。 The total luminous flux value of the above wavelength conversion member was determined as follows. First, a wavelength conversion member was installed on a light source having an excitation wavelength of 445 nm, the periphery was sealed with a white resin, and then an energy distribution spectrum of light emitted from the upper surface of the wavelength conversion member was measured in an integrating sphere. Next, the total luminous flux value was calculated by multiplying the obtained spectrum by the standard relative luminous sensitivity.
次に、上記の板状波長変換部材を、６５０ｍＡで通電した発光波長４４５ｎｍのＬＥＤチップ上に載置し、１００時間連続光照射を行った。光照射前及び光照射後の波長変換部材について、積分球内で汎用の発光スペクトル測定装置を用いて全光束値を測定した。全光束値の変化率は、１００時間光照射後の全光束値を、光照射前の全光束値で除して、１００を掛けた値（％）で表した。結果を表４〜６に示す。 Next, the above plate-like wavelength conversion member was placed on an LED chip having an emission wavelength of 445 nm that was energized at 650 mA, and continuous light irradiation was performed for 100 hours. About the wavelength conversion member before light irradiation and after light irradiation, the total luminous flux value was measured using the general-purpose emission spectrum measuring apparatus within the integrating sphere. The change rate of the total luminous flux value was expressed as a value (%) obtained by dividing the total luminous flux value after 100 hours of light irradiation by the total luminous flux value before light irradiation and multiplying by 100. The results are shown in Tables 4-6.
表４〜６から明らかなように、無機蛍光体としてＹＡＧを使用した場合、実施例であるＡ−１〜Ａ−１６の波長変換部材は、２．３（ｌｍ）以上であり、１００時間の光照射後においても、光照射前の全光束値の９９．５％以上を維持していた。一方、比較例であるＡ−１７の波長変換部材は、全光束値が２．２（ｌｍ）と低く、１００時間の光照射後の全光束値が、光照射前の９８％と低下した。また、比較例であるＡ−１８の波長変換部材は、１００時間の光照射後の全光束値が、光照射前の９７．５％と低下した。 As is apparent from Tables 4 to 6, when YAG is used as the inorganic phosphor, the wavelength conversion members of Examples A-1 to A-16 that are Examples are 2.3 (lm) or more, and are 100 hours. Even after the light irradiation, 99.5% or more of the total luminous flux value before the light irradiation was maintained. On the other hand, the wavelength conversion member of A-17 as a comparative example had a total luminous flux value as low as 2.2 (lm), and the total luminous flux value after 100 hours of light irradiation decreased to 98% before light irradiation. Further, in the wavelength conversion member of A-18 as a comparative example, the total luminous flux value after 100 hours of light irradiation decreased to 97.5% before light irradiation.
本発明の波長変換部材は、白色ＬＥＤ等の一般照明や特殊照明（例えば、プロジェクター光源、車載用前照灯等の車載用照明）等の構成部材として好適である。 The wavelength conversion member of the present invention is suitable as a constituent member for general illumination such as white LEDs and special illumination (for example, in-vehicle illumination such as a projector light source and in-vehicle headlamp).
１ 発光デバイス
２ 波長変換部材
３ 光源
DESCRIPTION OF SYMBOLS 1 Light emitting device 2 Wavelength conversion member 3 Light source
Claims (9)
前記ガラスマトリクスが、モル％で、ＳｉＯ２ ３０〜７５％、Ｂ２Ｏ３ ０〜１５％、Ａｌ２Ｏ３ ０〜１５％、Ｌｉ２Ｏ ０〜５％、Ｎａ２Ｏ ０〜５％、Ｋ２Ｏ ０〜５％、Ｌｉ２Ｏ＋Ｎａ２Ｏ＋Ｋ２Ｏ ０〜５％、ＭｇＯ ０〜３５％、ＣａＯ ０〜３５％、ＳｒＯ ０〜３５％、ＢａＯ ０〜３５％、ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ ０．１〜４５％、ＴｉＯ２ ０．１〜１５、Ｌａ２Ｏ３ ０〜２０、及びＺｎＯ ０〜５％を含有することを特徴とする波長変換部材。 A wavelength conversion member in which an inorganic phosphor is dispersed in a glass matrix,
Said glass matrix, in mol%, SiO 2 30~75%, B 2 O 3 0~15%, Al 2 O 3 0~15%, Li 2 O 0~5%, Na 2 O 0~5%, K 2 O 0~5%, Li 2 O + Na 2 O + K 2 O 0~5%, MgO 0~35%, CaO 0~35%, SrO 0~35%, BaO 0~35%, MgO + CaO + SrO + BaO 0.1~45 %, TiO 2 0.1~15, La 2 O 3 0~20, and the wavelength conversion member, characterized in that it contains 0 to 5% ZnO.
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| JP2020187205A (en) * | 2019-05-13 | 2020-11-19 | 日本特殊陶業株式会社 | Light wavelength conversion member and light-emitting device |
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