WO2019244506A1 - 光波長変換部材及び光波長変換装置並びに発光装置 - Google Patents
光波長変換部材及び光波長変換装置並びに発光装置 Download PDFInfo
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- WO2019244506A1 WO2019244506A1 PCT/JP2019/018819 JP2019018819W WO2019244506A1 WO 2019244506 A1 WO2019244506 A1 WO 2019244506A1 JP 2019018819 W JP2019018819 W JP 2019018819W WO 2019244506 A1 WO2019244506 A1 WO 2019244506A1
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Definitions
- the present disclosure relates to a light wavelength conversion member, a light wavelength conversion device, and a light emitting device that can convert the wavelength of light, for example, used in a wavelength conversion device, a fluorescent material, various kinds of lighting, a video device, and the like.
- a device that obtains white light by converting the wavelength of blue light from a light emitting diode (LED: Light Emitting Diode) or a semiconductor laser (LD: Laser Diode) using a fluorescent material. It has become mainstream.
- LED Light Emitting Diode
- LD Laser Diode
- a phosphor in which Ce is activated as a component of a garnet structure (A 3 B 5 O 12 ) as represented by Y 3 Al 5 O 12 : Ce (YAG: Ce) is used.
- Ce YAG: Ce
- a light emitting member that is, a light wavelength conversion member provided with a light emitting body
- a structure using a reflection layer provided with a reflection layer and using the reflection light reflected by the reflection layer is known.
- Patent Document 1 discloses a light emitting device including a laser-excited ceramic phosphor and a reflective layer having light reflectivity on a surface different from the laser irradiation surface.
- Patent Document 2 discloses a composite including a ceramic converter, a reflective coating containing metal, and a metal cooling body.
- the ceramic converter is directly coated with a reflective coating comprising a metal.
- JP 2016-58619 A Japanese Patent No. 6320531
- Patent Literature 1 For example, in the technology described in Patent Literature 1, light is reflected by a reflective layer having light reflectivity. However, since light is reflected only by a metal component of the reflective layer, light can be efficiently extracted. May not be possible.
- Patent Document 2 In the technique described in Patent Document 2, light is reflected by a reflective coating layer coated on a ceramic converter. However, as in Patent Document 1, light reflection is derived only from a metal component of the coating layer. Therefore, there is a possibility that light cannot be efficiently extracted.
- ⁇ ⁇ In one aspect of the present disclosure, it is desirable to provide a light wavelength conversion member, a light conversion device, and a light emitting device that can efficiently extract light.
- the light wavelength conversion member includes a fluorescent phase mainly composed of fluorescent crystal particles that emit fluorescence by incident light, and a light transmissive mainly composed of transparent crystal particles.
- the present invention relates to a light wavelength conversion member provided with a ceramic sintered body having a phase.
- This light wavelength conversion member has a reflective metal layer that reflects light on the side opposite to the side of the ceramic sintered body on which light is incident, and has an optical gap between the ceramic sintered body and the metal layer. And a dielectric multilayer film having dielectric layers having different refractive indexes.
- a dielectric material having a different refractive index of light is interposed between a ceramic sintered body that emits fluorescence in response to incident light and a metal layer having a performance of reflecting light (that is, a reflective layer). Since a dielectric multilayer film having a structure in which layers are stacked (that is, a dielectric multilayer film capable of reflecting and transmitting light) is provided, the reflection performance is higher than that of the conventional metal layer alone. Has performance.
- this light wavelength conversion member can reflect incident light and fluorescent light more efficiently than before. That is, since the light wavelength conversion member can efficiently extract light, the light wavelength conversion member has a high emission intensity (that is, fluorescence intensity).
- the dielectric multilayer film is a laminate of dielectric films that can transmit light and have different refractive indexes of light, that is, a high refractive index film and a low refractive index (lower refractive index film). It is a laminate having a configuration in which the rate films are sequentially laminated so as to be adjacent to each other.
- silicon oxide (SiO 2 ) or the like can be given as a material of the low refractive index film. Therefore, as the dielectric multilayer film, for example, a laminate of a titanium oxide layer and a silicon oxide layer can be mentioned.
- the total number of dielectric multilayer films Two to four layers can be adopted as the total number of dielectric multilayer films, and 25 nm to 100 nm can be adopted as the thickness of each film. Note that the total thickness of the dielectric multilayer film is preferably up to about 300 nm.
- the thickness of the ceramic sintered body is preferably in the range of 100 ⁇ m to 400 ⁇ m.
- the thickness of the metal layer is preferably, for example, in the range of 100 nm to 500 nm.
- the high-refractive-index film and the low-refractive-index film are sequentially laminated from the light incident side, specifically, the high-refractive-index film and the low-refractive-index film are different from each other at the wavelength ⁇ of light.
- the layers are sequentially stacked with an appropriate film thickness, the reflected light from the interface between the films is strengthened by interference.
- the dielectric multilayer film that is, the high-refractive-index film and the low-refractive-index film
- the dielectric multilayer film that is, the high-refractive-index film and the low-refractive-index film
- the dielectric multilayer film is set to a thickness that can increase the intensity of reflected light according to the wavelength of incident light.
- a high refractive index film and a low refractive index film are stacked in this order from the light incident side (the same applies to the case where a plurality of high refractive index films and low refractive index films are used).
- the crystal particles of the fluorescent phase have a composition represented by the chemical formula A 3 B 5 O 12 : Ce, and the A element and the B element are each selected from the following element group. It may be composed of at least one kind of element.
- the lanthanoid excluding Ce is the lanthanoid excluding Ce.
- the ceramic sintered body has a garnet structure represented by A 3 B 5 O 12 : Ce composed of at least one element selected from the above element group. With this composition, blue light can be efficiently converted to visible light.
- the ceramic sintered body by using the ceramic sintered body, light scattering occurs at the interface between the fluorescent phase and the translucent phase, and the angle dependence of the color of light can be reduced, so that the color uniformity can be improved (That is, color unevenness can be reduced).
- the ceramic sintered body has good thermal conductivity, heat generated in the ceramic sintered body by, for example, irradiation of laser light is efficiently discharged to the outside (for example, a metal layer or a heat radiating member). can do. Therefore, temperature quenching at which the ceramic sintered body does not emit fluorescence can be suppressed. Therefore, it is possible to suitably maintain the fluorescence even in the high power range of the laser.
- the compound having a composition represented by the chemical formula A 3 B 5 O 12 : Ce is desirably in the range of 3 vol% to 70 vol% of the entire ceramic sintered body.
- the Ce concentration of the compound represented by the chemical formula is preferably in the range of 0.1 mol% to 1.0 mol% with respect to the element A of the compound.
- the Gd concentration is desirably in the range of 30 mol% or less based on the A element.
- Ga concentration is preferably in the range of 30 mol% or less based on the B element.
- the crystal particles in the light transmitting phase may have a composition of Al 2 O 3 .
- Ag and / or Al may be included as a component of the metal layer.
- the component of the metal layer is Ag and / or Al, for example, light incident from the outside or light such as fluorescence emitted from the ceramic sintered body can be suitably reflected.
- an Ag layer made of Ag or an Al layer made of Al is preferable.
- a coating layer made of alumina may be provided on the side opposite to the light incident side.
- the thickness of alumina is preferably about 30 nm to 200 nm. If the thickness is larger than this, the heat radiation from the metal layer deteriorates, and heat cannot be efficiently released.
- the above-described light wavelength conversion member may further include a Ni layer and / or an Au layer on the side of the metal layer opposite to the light incident side.
- the metal layer has, for example, an Au layer on the side opposite to the light incident side
- the Au layer on the metal layer side and the heat radiating member can be firmly joined using, for example, solder (that is, the heat radiation member). High bonding strength).
- the metal layer has an Ag layer, and there is, for example, a Ni layer on the side opposite to the light incident side of the Ag layer, the oxidation of Ag can be suitably suppressed by the Ni layer.
- a Ni layer and / or an Au layer can be provided on the opposite side of the coating layer from the light incident side.
- the dielectric multilayer film has a high refractive index film having a refractive index a when light having a wavelength of 550 nm is incident, and a light having a wavelength of 550 nm is higher than the high refractive index film.
- the relationship between the refractive index c and the refractive index a of the ceramic sintered body when light having a wavelength of 550 nm is incident on the body may be 1 ⁇ a / c.
- the high-refractive-index film and the low-refractive-index film may each be a single layer, or a plurality of composite layers in which one high-refractive-index film and one low-refractive-index film are stacked. In some cases.
- the high refractive index film may include at least one element selected from Ti, Zr, Hf, Ta, and Nb, and the low refractive index film is SiO 2. Alternatively, it may be made of MgF 2 .
- the material of the high refractive index film includes at least one element selected from Ti, Zr, Hf, Ta, and Nb (for example, when the material is composed of the element)
- the material of the low refractive index film is SiO 2 or When made of MgF 2 , light can be efficiently extracted from the light wavelength conversion member.
- the total thickness of the dielectric multilayer film may be 300 nm or less.
- the total thickness of the dielectric multilayer film is 300 nm or less, the residual stress applied to the dielectric multilayer film is small, and the adhesion between the dielectric multilayer film and the metal layer does not easily decrease. Therefore, the total thickness of the dielectric multilayer film is preferably 300 nm or less.
- An optical wavelength conversion device relates to an optical wavelength conversion device including the optical wavelength conversion member.
- a heat radiation member is joined to the metal layer of the optical wavelength conversion member on the side opposite to the light incident side.
- the heat dissipation is improved by the heat radiating member, so that the temperature quenching at which the ceramic sintered body does not emit fluorescence due to the rise in the temperature of the ceramic sintered body can be suppressed.
- a joining material for joining the heat radiation member to the light wavelength conversion member for example, a metal solder or a well-known heat conductive adhesive having excellent heat conductivity can be used.
- the heat dissipating member is a member having better heat dissipating property (that is, thermal conductivity: thermal conductivity) than the ceramic sintered body, and various metal members such as aluminum and copper can be adopted.
- a light emitting device is a light emitting device including the light wavelength conversion device and a light emitting element that emits light.
- the light emitting element of the light emitting device a known element such as an LED or an LD can be used.
- the “fluorescent phase” is a phase mainly composed of fluorescent crystal particles
- the “light-transmitting phase” is a crystal particle having a light-transmitting property, specifically, a crystal particle having a composition different from that of the fluorescent phase. It is a phase mainly composed of
- the fluorescent phase may contain 50% by volume or more (preferably 90% by volume or more) of fluorescent crystal particles.
- the translucent phase may contain translucent crystal particles of 50% by volume or more (preferably 90% by volume or more).
- each crystal grain and its grain boundary may contain unavoidable impurities.
- a fluorescent phase and a translucent phase are 50% by volume or more (preferably 90% by volume or more) of the ceramic sintered body. May be included.
- ⁇ 3A a ratio of the fluorescent phase in the ceramic sintered body (accordingly, a ratio of crystal particles having fluorescence), 3 to 70% by volume can be adopted.
- the ratio of the light-transmitting phase in the ceramic sintered body (therefore, the ratio of the crystal particles having a light-transmitting property), 30 to 97% by volume can be adopted.
- a 3 B 5 O 12 Ce
- Ce Ce part of the element A in A 3 B 5 O 12 has indicated that the solid solution substitution, by having such a structure
- the compound exhibits fluorescent characteristics.
- FIG. 3 is an explanatory diagram illustrating a principle of increasing the intensity of reflected light using a dielectric multilayer film. It is sectional drawing which fractured
- the light wavelength conversion member 1 of the present embodiment includes a plate-shaped ceramic sintered body 3 and a dielectric multilayer from the upper side of FIG. 2 (that is, from the side where external light (Light) enters).
- This is a plate material in which the film 5 and the metal layer # 7 are laminated.
- the side on which light is incident (upper in FIG. 2) is referred to as the incident side
- the side on which the incident light is reflected (that is, the side opposite to the incident side: lower in FIG. 2) is referred to as the reflecting side.
- the ceramic sintered body 3 is mainly composed of a fluorescent phase mainly composed of fluorescent crystal particles (that is, fluorescent phase particles) by light incident from the outside and a transparent crystal particle (that is, transparent phase particles). And a light-transmitting phase.
- the ceramic sintered body 3 is composed of a fluorescent phase, which is a lump composed of one or more fluorescent phase particles, and a translucent phase, which is a lump composed of one or more translucent phase particles. It is configured.
- the ceramic sintered body 3 is substantially composed of fluorescent phase particles and fluorescent phase particles.
- the fluorescent phase particles and the fluorescent phase particles are, for example, 90% by volume or more (for example, approximately 100% by volume) in the ceramic sintered body 3.
- the fluorescent phase particles have a composition represented by the chemical formula A 3 B 5 O 12 : Ce, and the A element and the B element are each composed of at least one element selected from the following element group. ing.
- a and B of Ce has the formula A 3 B 5 O 12: shows the element (where different elements) constituting the substance represented by Ce, O is oxygen, Ce is cerium.
- the compound represented by the chemical formula A 3 B 5 O 12 : Ce (that is, the fluorescent phase particles) is, for example, in a range of 3 vol% to 70 vol% of the entire ceramic sintered body 3.
- the Ce concentration in the fluorescent phase particles is, for example, in the range of 0.1 mol% to 1.0 mol% with respect to the element A of the compound.
- the Gd concentration is, for example, in the range of 30 mol% or less based on the element A.
- Ga is contained in the B element, for example, the Ga concentration is in a range of 30 mol% or less based on the B element.
- the translucent phase particles have, for example, a composition of Al 2 O 3 .
- the dimensions of the ceramic sintered body 3 are, for example, 10 mm long ⁇ 10 mm wide, and the thickness is, for example, in the range of 100 ⁇ m to 400 ⁇ m (for example, 100 ⁇ m).
- the dielectric multilayer film 5 is a multilayer film that includes dielectric layers having different refractive indices of light (that is, a plurality of layers) and is capable of transmitting light.
- the dielectric multilayer film 5 is a laminate of dielectric films having different refractive indexes of light (that is, respective dielectric films), that is, a high refractive index film and a low refractive index film (having a lower refractive index). And a laminate.
- the dielectric multilayer film 5 includes, for example, a TiO 2 film (that is, a high refractive index film) 5 a made of TiO 2 disposed on the light incident side and a reflection side. and SiO 2 film (i.e. a low refractive index film) made of SiO 2 5b and is a laminate that is laminated.
- a TiO 2 film that is, a high refractive index film
- SiO 2 film i.e. a low refractive index film
- each of the TiO 2 film 5a and the SiO 2 film 5b can be, for example, in the range of 25 nm to 100 nm. Note that the total film thickness is preferably up to about 300 nm.
- the intensity of the reflected light can be increased by defining the thicknesses of the high refractive index film and the low refractive index film according to the wavelength of the incident light. Accordingly, here, the thickness of each of the TiO 2 film 5a and the SiO 2 film 5b is set to a thickness that can increase the intensity of the reflected light according to the wavelength ⁇ of the incident light.
- the thickness of each of the TiO 2 film 5a and the SiO 2 film 5b is preferably 50 nm.
- the metal layer 7 is a layer made of a reflective metal that reflects light.
- one layer (Ag layer) made of, for example, Ag is illustrated as the metal layer 7, but a layer (eg, an Al layer) made of another metal (eg, Al) may be adopted.
- the metal layer 7 may have a multilayer structure in which layers made of different metals (for example, an Ag layer and an Al layer) are stacked.
- the thickness of the metal layer 7 can be, for example, in the range of 100 nm to 500 nm.
- the powder material of the ceramic sintered body 3 was weighed (that is, prepared) so as to satisfy the configuration of the first embodiment.
- the pressed body was fired at a predetermined temperature for a predetermined time to obtain a ceramic sintered body 3.
- the ceramic sintered body 3 may be obtained by firing a sheet molded body obtained by sheet-forming the slurry.
- a dielectric multilayer film 5 was formed on one side (reflection side) of the ceramic sintered body 3 in the thickness direction.
- the TiO 2 film 5a was formed by vacuum evaporation. Thereafter, an SiO 2 film 5b was formed on the surface of the TiO 2 film 5a (that is, the exposed surface on the reflection side) by vacuum evaporation.
- a metal layer (for example, an Ag layer) 7 was formed on the surface of the SiO 2 film 5b of the dielectric multilayer film 5 (that is, the exposed surface on the reflection side) by, for example, vacuum evaporation.
- various thin film forming methods such as sputtering and plating can be adopted in addition to vacuum deposition.
- the light wavelength conversion member 1 of the first embodiment has a reflective metal layer (Ag layer) 7 for reflecting light on the side of the ceramic sintered body 3 opposite to the side on which light is incident.
- a dielectric multilayer film 5 composed of dielectric layers having different refractive indices of light is provided between the ceramic sintered body 3 and the metal layer 7.
- the dielectric multilayer film 5 has a configuration in which a high-refractive-index film 5a and a low-refractive-index film 5b are laminated from the light incident side, and reflected light from the interface between the films 5a and 5b is It has the property of strengthening by interference.
- the light wavelength conversion member 1 has higher reflection performance than the conventional reflection performance (ie, reflectance) of only the metal layer. That is, the light wavelength conversion member 1 can reflect incident light and fluorescent light more efficiently than in the past. Therefore, since the light wavelength conversion member 1 can efficiently extract light, the light wavelength conversion member 1 has a high emission intensity (that is, fluorescence intensity).
- the crystal particles of the fluorescent phase have a composition represented by the chemical formula A 3 B 5 O 12 : Ce, and the A element and the B element are each selected from the following element group. It is composed of at least one element.
- the ceramic sintered body 3 has a good thermal conductivity, the heat generated in the light wavelength conversion member 1 by, for example, irradiation of a laser beam can be efficiently transferred to the outside (for example, the metal layer 7 or the heat radiation member). Can be discharged. Therefore, temperature quenching at which the ceramic sintered body 3 does not emit fluorescence can be suppressed. Therefore, it is possible to suitably maintain the fluorescence even in the high power range of the laser.
- the metal layer 7 is made of Ag, it is possible to suitably reflect, for example, light incident from the outside and light such as fluorescence emitted from the ceramic sintered body 3.
- the metal layer 7 is not limited to the Ag layer, but may be an Al layer or the like.
- the optical wavelength conversion member 11 includes a ceramic sintered body 3, a TiO 2 film 5a and a SiO 2 film 5a from the upper side of incidence in FIG. It has a configuration in which a dielectric multilayer film 5 composed of two films 5b and a metal layer (that is, an Ag layer) 7 are stacked.
- the reflection side of the Ag layer 7 (the lower part of FIG. 4), so as to cover the entire surface of the Ag layer 7, Al 2 O 3 layer 13 made of Al 2 O 3 are laminated I have.
- the thickness of the Al 2 O 3 layer 13 is, for example, 30 nm to 200 nm.
- This Al 2 O 3 layer 13 can be formed, for example, by vacuum evaporation.
- the second embodiment has the same effects as the first embodiment.
- the surface of the Ag layer 7 is covered with the Al 2 O 3 layer 13, the oxidation of Ag can be suppressed. Therefore, deterioration of the reflection characteristics of the Ag layer 7 can be suppressed.
- the light wavelength conversion member 21 of the third embodiment includes a ceramic sintered body 3, a TiO 2 film 5a and a SiO 2 film 5a from the upper incident side in FIG. It has a configuration in which a dielectric multilayer film 5 composed of two films 5b and a metal layer (that is, an Ag layer) 7 are stacked.
- the Ni layer 23 made of Ni is laminated on the reflection side (the lower part in FIG. 5) of the Ag layer 7 so as to cover the entire surface of the Ag layer 7.
- the thickness of the Ni layer 23 is, for example, 100 nm.
- the configuration including the Ag layer (that is, the metal layer) 7 and the Ni layer 23 is referred to as a metal coating 25. .
- the third embodiment has the same effects as the first embodiment.
- the surface of the Ag layer 7 is covered with the Ni layer 23, the oxidation of Ag can be suppressed.
- an optical wavelength conversion member according to a fourth embodiment will be described, but the description of the same contents as in the second embodiment will be omitted or simplified. In addition, about the structure similar to 2nd Embodiment, the same number is attached.
- the light wavelength conversion member 31 of the fourth embodiment includes a ceramic sintered body 3, a TiO 2 film 5a and a SiO 2 film 5a from the upper incident side in FIG. It has a configuration in which a dielectric multilayer film 5 composed of two films 5b, a metal layer (that is, an Ag layer) 7, and an Al 2 O 3 layer 13 are stacked.
- the reflection side of the Al 2 O 3 layer 13 (lower side in FIG. 6), so as to cover the entire surface of the Al 2 O 3 layer 13, the third embodiment similar to Ni layer 23 are stacked.
- the fourth embodiment has the same effects as the first embodiment.
- the surface of the Ag layer 7 is covered with the Al 2 O 3 layer 13 and the Ni layer 23, the oxidation of Ag can be suitably suppressed.
- an optical wavelength conversion member according to a fifth embodiment will be described, but the description of the same contents as in the third embodiment will be omitted or simplified.
- the same number is attached.
- the light wavelength conversion member 41 of the fifth embodiment includes a ceramic sintered body 3, a TiO 2 film 5a, and a SiO 2 film 5a from the upper incident side in FIG. It has a configuration in which a dielectric multilayer film 5 composed of two films 5b, a metal layer (that is, an Ag layer) 7, and a Ni layer 23 are stacked.
- the Au layer 43 made of Au is laminated on the reflection side (the lower part in FIG. 7) of the Ni layer 23 so as to cover the entire surface of the Ni layer 23.
- the thickness of the Au layer 43 is, for example, 200 nm.
- various thin-film forming methods such as vacuum deposition, sputtering, and plating can be employed as in the case of the Ni layer 23.
- the fifth embodiment has the same advantages as the third embodiment.
- the surface of the Ag layer 7 is covered with the Ni layer 23 and the Au layer 43, the oxidation of Ag can be suitably suppressed.
- an Al layer may be provided instead of the Ag layer 7, and an Ag layer may be provided instead of the Au layer 43. Further, an Al 2 O 3 layer 13 similar to that of the fourth embodiment may be provided between the Ag layer 7 and the Ni layer 23.
- an optical wavelength converter according to a sixth embodiment will be described, but the description of the same contents as in the fifth embodiment will be omitted or simplified. In addition, about the structure similar to 5th Embodiment, the same number is attached
- the optical wavelength conversion device 51 of the sixth embodiment includes a bonding portion 53 made of a bonding material on the reflection side (the lower part of FIG. 8) of the optical wavelength conversion member 41 similar to the fifth embodiment. Thereby, the plate-shaped heat radiation member 55 is joined.
- the light wavelength conversion member 41 includes a ceramic sintered body 3 and a dielectric multilayer film 5 composed of a TiO 2 film 5a and a SiO 2 film 5b from the upper incident side in FIG. , A metal layer (that is, an Ag layer) 7, a Ni layer 23, and an Au layer 43.
- the bonding portion 53 is made of a bonding material having high thermal conductivity, for example, a metal bonding material such as solder made of Pb or the like.
- a metal bonding material such as solder made of Pb or the like.
- a known heat conductive adhesive having excellent heat conductivity can be used.
- the heat radiation member 55 is a member having a larger outer shape than the light wavelength conversion member 41 in a plan view (when viewed from above and below in FIG. 8).
- the size of the light wavelength conversion member 41 is, for example, 3.5 mm in length ⁇ 3.5 mm in width ⁇ 100 ⁇ m in thickness
- the size of the heat radiation member is, for example, 12 mm in length ⁇ 12 mm in width ⁇ 1.5 mm in thickness. it can.
- the heat dissipating member 55 is a member having better heat dissipating property (that is, thermal conductivity: thermal conductivity) than the ceramic sintered body 3, and for example, a metal member such as aluminum or copper can be adopted.
- a protective layer may be formed between the light wavelength conversion member 41 and the bonding portion 53 in order to improve the bonding property.
- a Ni sheet can be adopted as this protective layer.
- the sixth embodiment has the same effect as the fifth embodiment.
- the heat radiation member 55 is joined to the light wavelength conversion member 41, heat radiation is high. Therefore, the temperature rise of the ceramic sintered body 3 can be suppressed, and the temperature quenching can be suppressed. Therefore, it has excellent light emission characteristics (that is, fluorescence characteristics).
- a light emitting device according to a seventh embodiment will be described, but the description of the same contents as in the sixth embodiment will be omitted or simplified. In addition, about the structure similar to 6th Embodiment, the same number is attached
- the light emitting device 61 of the seventh embodiment has a light emitting element 63 arranged on the incident side (upper side of FIG. 9) of the light wavelength conversion device 51 similar to the sixth embodiment. is there.
- a known element such as an LED or an LD can be used.
- the light emitting element 63 irradiates the surface of the ceramic sintered body 3 with blue light.
- the irradiated light is wavelength-converted by the ceramic sintered body 3 or reflected by the Ag layer 7 or the like, and the upper surface of the light wavelength conversion member 41 in FIG. 9), each color becomes a mixed white color, and is irradiated upward in FIG.
- the seventh embodiment has the same advantages as the sixth embodiment. Further, the light emitting device 61 of the seventh embodiment can irradiate light with high emission intensity to the outside. [8. Example] Next, specific examples and the like of the embodiment will be described.
- Nos. 1 to 6 and 10 to 18 are samples within the range of the present disclosure
- Nos. 7 to 9 are samples of comparative examples outside the range of the present disclosure.
- the same configuration as that of the third embodiment was adopted. That is, a configuration in which a ceramic sintered body, a dielectric multilayer film, an Ag layer, and a Ni layer were laminated was adopted. Also, in the column of each sample of the dielectric multilayer film in Table 1, that is, in the column showing each dielectric film constituting the dielectric multilayer film, the column closer to the ceramic sintered body is described on the left side of each column. [8-1. Sample evaluation method] First, each evaluation method performed on each sample will be described.
- the light wavelength conversion member of each sample is irradiated with blue LD light having a wavelength of 465 nm, which is condensed by a lens to a width of 0.1 mm, and the reflected light is condensed by a lens.
- the chromaticity value (X) was measured by Konica Minolta CL-500A). The power density irradiated at this time was 0 to 100 W / mm 2 .
- Color unevenness (ie, color variation) was evaluated by measuring chromaticity variation using an illuminometer.
- a blue LD light having a wavelength of 465 nm is condensed by a lens to have a width of 0.5 mm for the light wavelength conversion member of each sample, and the light reflected by the irradiation is spectrally radiated.
- the chromaticity was measured with an illuminometer (CL-500A manufactured by Konica Minolta).
- Irradiation was performed by dividing a 9 mm square central portion into 9 regions at 3 mm intervals with respect to the surface of each sample (that is, the sample surface), and evaluating the chromaticity (X direction) variation ( ⁇ x) of each region. .
- the variation ( ⁇ x) indicates the maximum value of the deviation in the chromaticity direction, and it is preferable that ⁇ x ⁇ 0.03.
- the chromaticity is a chromaticity represented by the CIE-XYZ color system in the International Display Law established by the International Commission on Illumination (CIE) in 1931. That is, the chromaticity is represented by an xy chromaticity diagram (so-called CIE chromaticity diagram) in which the three primary colors on the color specification are converted into numerical values and the colors are represented in an xy coordinate space.
- CIE International Commission on Illumination
- the light wavelength conversion member of each sample is irradiated with blue LD light having a wavelength of 465 nm, which is condensed by a lens to a width of 0.1 mm, and the temperature of the irradiated part (that is, the part irradiated with the blue LD light) (ie, (Irradiation part temperature) was measured with a radiation thermometer. At this time, the output density of the irradiated blue LD light was set to 40 W / mm 2 .
- the refractive index ratio a / b, a / c of each sample is the refractive index a, b (that is, the refractive index of the high refractive index film) of each dielectric film constituting the dielectric multilayer film of each sample with respect to light having a wavelength of 550 nm.
- the refractive index a of TiO 2 , Ta 2 O 5 , HfO 2 , ZrO 2 , and Nb 2 O 5 is larger than the refractive index b of SiO 2 , and the refractive index a of TiO 2 is the refractive index b of MgF 2. Is greater.
- Total thickness of dielectric multilayer film is the sum of the film thicknesses of the dielectric films constituting the dielectric multilayer film of each sample.
- a ceramic sintered body (phosphor) was produced in the following procedure.
- the dimensions of the ceramic sintered body were 10 mm long ⁇ 10 mm wide ⁇ 200 ⁇ m thick.
- each sample of Nos. 1 to 4 that is, in order to manufacture a ceramic sintered body having the composition of each sample
- Table 1 Al 2
- O 3 average particle size 0.2 ⁇ m
- Y 2 O 3 average particle size 1.2 ⁇ m
- CeO 2 average particle size 1.5 ⁇ m
- the obtained powder was press-molded, and further subjected to CIP molding to obtain a molded body. After degreasing the obtained molded body, it was fired in an air atmosphere to obtain a ceramic sintered body. At this time, firing was performed at a firing temperature of 1600 ° C. and a holding time of 10 hours.
- a dielectric multilayer film was formed on one surface of a ceramic sintered body. That is, a TiO 2 film was formed on the surface of the ceramic sintered body, and an SiO 2 film was formed on the surface of the TiO 2 film.
- a TiO 2 film and a SiO 2 film were laminated one by one or two as a dielectric multilayer film.
- the thickness of each film was 25 nm or 50 nm.
- sample No.3 is, TiO 2 film, a SiO 2 film, a TiO 2 film, in the order of the SiO 2 film was formed and a TiO 2 film and the SiO 2 film on two by two layers.
- the surface of the dielectric multilayer film (that is, the surface of the SiO 2 film) is coated with Ag or Al as a metal having reflectivity, so that the Ag layer or Al A layer was formed.
- the thickness of this Ag layer or Al layer was 300 nm.
- Ni layer was formed on the surface of the Ag layer or the Al layer as shown in Table 1 below.
- the thickness of this Ni layer was 100 nm.
- the samples of Nos. 1 to 4 are preferable because the laser output exceeds 100 W / mm 2 and temperature quenching hardly occurs.
- the refractive index ratio a / b is 2.02
- the refractive index ratio a / c is 1.65, so that the fluorescence intensity is 108% or more. It is preferable because it is high.
- the color unevenness is as small as 0.029 or less
- the temperature of the irradiated portion is as low as 128 ° C. or less (that is, excellent in heat dissipation), which is preferable.
- the total thickness of the dielectric multilayer film is as small as 100 nm or less, the adhesion of the film is excellent.
- Gd 2 O 3 (average particle size 1.1 ⁇ m) was added, and the amount of Gd was adjusted to be 30% by mol ratio with respect to the amount of Y.
- Lu 2 O 3 (average particle size of 4.1 ⁇ m) and Ga 2 O 3 (average particle size of 0.9 ⁇ m) were added, and the Lu amount was changed to the Y amount in a molar ratio.
- the amount of Ga was adjusted to be 50% by mol ratio with respect to the amount of Al so as to be 50%.
- the samples of Nos. 5 and 7 are preferable because the laser output exceeds 100 W / mm 2 and temperature quenching hardly occurs.
- the refractive index ratio a / b is 2.02 and the refractive index ratio a / c is 1.65, so that the fluorescence intensity is 106% or more. It is preferable because it is high.
- the color unevenness is as small as 0.029, and the temperature of the irradiated portion is as low as 132 ° C. or less, which is preferable.
- the total thickness of the dielectric multilayer film is as small as 100 nm, the adhesion of the film is excellent.
- Example 3 A sample of the No. 7 light wavelength conversion member was manufactured under the conditions shown in Table 1 below.
- the sample of No. 7 is a comparative example in which no dielectric multilayer film is provided.
- the sample of No. 7 has an undesirably low fluorescence intensity of 94%. Further, the adhesion of the film is low, which is not preferable.
- the sample of No. 8 is not preferable because the laser output is as low as 40 W / mm 2 and the fluorescence intensity is as low as 90%.
- the color unevenness is large and the temperature of the irradiation part is high, which is not preferable.
- the sample of No. 9 has an undesirably low laser output of 75 W / mm 2 .
- the color unevenness is large and the temperature of the irradiated part is high, which is not preferable.
- the fluorescence intensity is 100%, which is lower than those of the other samples Nos. 1 to 6.
- the method for preparing the ceramic sintered body sample of Experimental Example 5 is basically the same as that of Experimental Example 1, but the configuration of the metal coating is changed.
- the Ag layer or the Al layer was formed to 200 nm
- the Ni layer was formed to 100 nm
- the Au layer or the Ag layer was formed to 200 nm on the surface of the Ni layer. did.
- the samples of Nos. 10 and 11 are preferable because the laser output exceeds 100 W / mm 2 and temperature quenching hardly occurs.
- the refractive index ratio a / b is 2.02 and the refractive index ratio a / c is 1.65, so that the fluorescence intensity is 105% or more. It is preferable because it is high. Further, color unevenness is as small as 0.029 or less, and the temperature of the irradiated portion is as low as 126 ° C. or less, which is preferable.
- the total thickness of the dielectric multilayer film is as small as 100 nm, the adhesion of the film is excellent.
- the samples of Nos. 12 to 17 are preferable because the laser output resistance exceeds 100 W / mm 2 and the temperature quenching hardly occurs.
- the structure of the dielectric multilayer film and the metal coating shown in Table 1 is provided, and the refractive index ratio a / b is 1.32 or more and the refractive index ratio a / c is 1.08 or more. % Or more, which is suitable.
- the color unevenness is as small as 0.034 or less, and the temperature of the irradiated portion is as low as 135 ° C. or less.
- the total thickness of the dielectric multilayer film is as small as 300 nm, the adhesion of the film is excellent.
- the sample of No. 18 is preferable because the laser output exceeds 100 W / mm 2 and temperature quenching hardly occurs.
- the refractive index ratio a / b is 2.02 and the refractive index ratio a / c is 1.65, so that the fluorescence intensity is 118%. High and preferred. Since the total thickness of the dielectric multilayer film was 400 nm, the adhesion of the film was lower than that of a sample having a total thickness of 300 nm.
- the sample was prepared by firing in the atmosphere, but in addition, a sample having the same performance by hot press firing, vacuum firing, reducing atmosphere firing, HIP, or a firing method combining these is used. Can be produced.
- Examples of the use of the light wavelength conversion member and the light emitting device include various uses such as a phosphor, a light wavelength conversion device, an optical device such as a headlamp, lighting, and a projector.
- the light-emitting element used in the light-emitting device is not particularly limited, and various types such as a well-known LED and LD can be adopted.
- each of the above embodiments may be shared between a plurality of components, or the functions of a plurality of components may be exhibited by one component. Further, a part of the configuration of each of the above embodiments may be omitted. Further, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of another embodiment. Note that all aspects included in the technical idea specified by the language described in the claims are embodiments of the present disclosure.
Abstract
Description
以下、誘電体多層膜によって、反射光の強度が向上する理由を説明するが、公知の原理であるので、簡単に説明する。
B:Al、Ga
なお、Ceを除くランタノイドとは、ランタノイドからCeを除外したものである。
・「蛍光相」は、蛍光性を有する結晶粒子を主体とする相であり、「透光相」は、透光性を有する結晶粒子、詳しくは蛍光相の結晶粒子とは異なる組成の結晶粒子を主体とする相である。
3…セラミックス焼結体
7…金属層
5…誘電体多層膜
5a…高屈折率膜
5b…低屈折率膜
23…Ni層
43…Au層
51…光波長変換装置
61…発光装置
63…発光素子
[1.第1実施形態]
[1-1.光波長変換部材の構成]
まず、本第1実施形態の光波長変換部材の構成について説明する。
セラミックス焼結体3は、外部から入射した光によって蛍光性を有する結晶粒子(即ち蛍光相粒子)を主体とする蛍光相と、透光性を有する結晶粒子(即ち透光相粒子)を主体とする透光相と、から構成されている蛍光体である。
B:Al、Ga
なお、前記化学式A3B5O12:CeのA及びBは、化学式A3B5O12:Ceで示される物質を構成する各元素(但し異なる元素)を示しており、Oは酸素、Ceはセリウムである。
誘電体多層膜5は、光の屈折率が異なる誘電体の層(即ち複数の層)からなり、光の透過が可能な多層膜である。
金属層7は、光を反射する反射性を有する金属からなる層である。
[1-2.光波長変換部材の製造方法]
次に、光波長変換部材1を製造する際の概略の手順について、図3に基づいて、簡単に説明する。
[1-3.効果]
次に、本第1実施形態の効果を説明する。
B:Al、Ga
この組成により、効率よく青色光を可視光に変換することができる。また、前記セラミックス焼結体3を使用することで、蛍光相と透光相の界面での光の散乱が起き、光の色の角度依存性を減らすことができるので、色均質性を向上できる(即ち色ムラを低減できる)。
[2.第2実施形態]
次に、第2実施形態の光波長変換部材について説明するが、第1実施形態と同様な内容については、説明を省略又は簡易化する。なお、第1実施形態と同様な構成については、同様な番号を付す。
[3.第3実施形態]
次に、第3実施形態の光波長変換部材について説明するが、第1実施形態と同様な内容については、説明を省略又は簡易化する。なお、第1実施形態と同様な構成については、同様な番号を付す。
[4.第4実施形態]
次に、第4実施形態の光波長変換部材について説明するが、第2実施形態と同様な内容については、説明を省略又は簡易化する。なお、第2実施形態と同様な構成については、同様な番号を付す。
[5.第5実施形態]
次に、第5実施形態の光波長変換部材について説明するが、第3実施形態と同様な内容については、説明を省略又は簡易化する。なお、第3実施形態と同様な構成については、同様な番号を付す。
[6.第6実施形態]
次に、第6実施形態の光波長変換装置について説明するが、第5実施形態と同様な内容については、説明を省略又は簡易化する。なお、第5実施形態と同様な構成については、同様な番号を付す。
[7.第7実施形態]
次に、第7実施形態の発光装置について説明するが、第6実施形態と同様な内容については、説明を省略又は簡易化する。なお、第6実施形態と同様な構成については、同様な番号を付す。
[8.実施例]
次に、前記実施形態の具体的な実施例等について説明する。
[8-1.試料の評価方法]
まず、各試料に対して実施した各評価の方法について説明する。
各試料の光波長変換部材のセラミックス焼結体の開気孔率を、JIS R1634に規定される方法によって測定し、その測定値からセラミックス焼結体の相対密度を求めた。
各試料の光波長変換部材に対し、465nmの波長を有する青色LD光を、レンズで0.1mm幅まで集光させて照射し、反射した光をレンズにて集光し、分光放射照度計(コニカミノルタ製CL-500A)によって色度値(X)を測定した。この時照射される出力密度は0~100W/mm2とした。
各試料の光波長変換部材に対して、465nmの波長を有する青色LD光を、レンズで0.1mm幅まで集光させて照射し、反射した光をレンズにて集光し、パワーセンサーによって、その時の発光強度(即ち蛍光強度)を測定した。この時照射される出力密度は40W/mm2とした。そして、セラミックス焼結体(蛍光体)として単結晶(即ちYAG:Ce単結晶体)を用いた時の蛍光強度を100%として、各試料の蛍光強度の比較を行った。なお、蛍光強度については、100%以上であることが好ましい。
色ムラ(即ち色バラつき)は、照度計による色度バラツキ測定によって評価した。
各試料の光波長変換部材に対し、465nmの波長を有する青色LD光を、レンズで0.1mm幅まで集光させて照射し、照射部(即ち青色LD光を照射した部分)の温度(即ち照射部温度)を放射温度計により測定した。この時、照射される青色LD光の出力密度を40W/mm2とした。
各試料の屈折率比a/b、a/cは、各試料の誘電体多層膜を構成する各誘電体膜の波長550nmの光に対する屈折率a、b(即ち、高屈折率膜の屈折率aと、屈折率が高屈折率膜より低い低屈折率膜の屈折率b)と、各試料のセラミックス焼結体の波長550nmの光に対する屈折率cとから算出した。
各試料の誘電体多層膜の総厚みは、各試料の誘電体多層膜を構成する各誘電体膜の膜厚の合計である。
各試料に対して、膜の密着性を確認するために、テープ試験を実施した。試験方法は、JIS R3255に準拠して、測定を行った。そして、セラミックス焼結体と誘電体多層膜との界面や、誘電体多層膜を構成する各誘電体膜の間の界面において、剥離が発生するかを確認した。判定基準は、剥離なし、一部剥離、全て剥離、とした。
[8-2.試料の製造方法及び評価結果]
次に、各試料の製造方法と、各試料の評価結果について説明する。
下記表1に示す条件により、No.1~4の光波長変換部材の試料を作製した。
下記表1に示す条件により、No.5、6の光波長変換部材の試料を作製した。
下記表1に示す条件により、No.7の光波長変換部材の試料を作製した。このNo.7の試料とは、誘電体多層膜を設けない比較例である。
下記表1に示す条件により、No.8、9の光波長変換部材の試料を作製した。このNo.8、9の試料は、No.1~7の試料とは、セラミックス焼結体の種類が異なる。
下記表1に示す条件により、No.10、11の光波長変換部材の試料を作製した。
下記表1に示す条件により、No.12~18の光波長変換部材の試料を作製した。
本開示は前記実施形態になんら限定されるものではなく、本開示を逸脱しない範囲において種々の態様で実施しうることはいうまでもない。
Claims (10)
- 入射した光によって蛍光を発する蛍光性を有する結晶粒子を主体とする蛍光相と、
透光性を有する結晶粒子を主体とする透光相と、
を有するセラミックス焼結体を備えた光波長変換部材において、
前記セラミックス焼結体の前記光が入射する側とは反対側に、光を反射する反射性を有する金属層を有するとともに、
前記セラミックス焼結体と前記金属層との間に、光の屈折率が異なる誘電体の層を有する誘電体多層膜を備えた、
光波長変換部材。 - 前記蛍光相の結晶粒子は、化学式A3B5O12:Ceで表される組成を有するとともに、前記A元素及び前記B元素は、それぞれ下記元素群から選択される少なくとも1種の元素から構成されている、
A:Sc、Y、Ceを除くランタノイド
B:Al、Ga
請求項1に記載の光波長変換部材。 - 前記透光相の結晶粒子は、Al2O3の組成を有する、
請求項1又は2に記載の光波長変換部材。 - 前記金属層の成分として、Ag及び/又はAlを含む、
請求項1~3のいずれか1項に記載の光波長変換部材。 - さらに、前記金属層の前記光の入射側とは反対側に、Ni層及び/又はAu層を備えた、
請求項4に記載の光波長変換部材。 - 前記誘電体多層膜は、波長550nmの前記光が入射したときの屈折率aの高屈折率膜と、前記高屈折率膜よりも波長550nmの前記光が入射したときの屈折率が低い屈折率bの低屈折率膜と、を交互に積層した膜であり、前記屈折率aと前記屈折率bとの関係が、1.3<a/bであり、
且つ、前記セラミックス焼結体に波長550nmの前記光が入射したときの屈折率cと前記屈折率aとの関係が、1<a/cである、
請求項1~5のいずれか1項に記載の光波長変換部材。 - 前記高屈折率膜は、Ti、Zr、Hf、Ta、Nbから選択される少なくとも1種の元素を含み、前記低屈折率膜は、SiO2又はMgF2からなる、
請求項6に記載の光波長変換部材。 - 前記誘電体多層膜の総厚みが、300nm以下である、
請求項1~7のいずれか1項に記載の光波長変換部材。 - 前記請求項1~8のいずれか1項に記載の光波長変換部材を備え、
前記光波長変換部材の前記金属層の前記光の入射側とは反対側に、放熱部材が接合された、
光波長変換装置。 - 前記請求項9に記載の光波長変換装置と、前記光を発光する発光素子と、を備えた、
発光装置。
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