JP2016058638A - Wavelength conversion member, light emission device, projector and method of manufacturing wavelength conversion member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wavelength conversion member that is improved in light extraction efficiency and durability.SOLUTION: A wavelength conversion member 10 has a substrate 11, a dichroic mirror layer 12 which is provided on the substrate 11 and reflects at least a part of light from the upper side, an SiOlayer 13 provided on the dichroic mirror layer 12, a ZnO layer 14 provided on the SiOlayer 13, and a phosphor layer 15 which is provided on the ZnO layer 14 and contains plural phosphor bodies 16. In the phosphor layer 15, ZnO is provided among the plural phosphor bodies 16.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wavelength conversion member containing a phosphor used in a projector or the like.

  Conventionally, a projector that projects an image on a screen is known. In general, a projector spatially modulates light emitted from a light source with a digital micromirror device or a liquid crystal display element, and projects (displays) an image.

  In recent years, a light source for a projector that obtains desired light by irradiating light to a wavelength conversion member including a phosphor by a light emitting diode (LED) or a semiconductor laser (LD) is known.

  In the wavelength conversion member as described above, the phosphor has been conventionally sealed with a resin, but a configuration in which a gap between the phosphors is filled with zinc oxide (ZnO) has also been proposed (for example, Patent Documents). 1 and Patent Document 2).

International Publication No. 2013/172020 International Publication No. 2013/175773

  In the wavelength conversion member as described above, improvement in light extraction efficiency and improvement in durability are problems.

  The present invention provides a wavelength conversion member having improved light extraction efficiency and durability.

  A wavelength conversion member according to one embodiment of the present invention includes a substrate, a reflective layer that is provided on the substrate and reflects at least part of light from above, and a light-transmitting layer that is provided on the reflective layer. A transparent amorphous layer, a translucent metal oxide layer provided on the amorphous layer, and a phosphor layer containing a plurality of phosphors provided on the metal oxide layer In the phosphor layer, the same metal oxide as the metal oxide layer is provided between the plurality of phosphors.

  In the method for manufacturing a wavelength conversion member according to one aspect of the present invention, a reflective layer that reflects at least part of light from above is formed on a substrate, and an amorphous layer having translucency is formed on the reflective layer. Forming a translucent metal oxide layer on the amorphous layer, depositing a plurality of phosphors on the metal oxide layer, and crystal-growing the metal oxide layer, A phosphor layer in which the same metal oxide as the metal oxide layer is provided between the plurality of phosphors is formed.

  ADVANTAGE OF THE INVENTION According to this invention, the wavelength conversion member which improved the extraction efficiency and durability of light, and a light-emitting device and projector using the same are realizable.

1 is an external perspective view of a wavelength conversion member according to Embodiment 1. FIG. 2 is a cross-sectional view (cross-sectional view taken along the line AA in FIG. 1) of the wavelength conversion member according to the first embodiment. FIG. 3A is a first cross sectional view for illustrating the method for manufacturing the wavelength conversion member according to the first embodiment. FIG. 3B is a second cross-sectional view for explaining the method of manufacturing the wavelength conversion member according to Embodiment 1. FIG. 3C is a third cross-sectional view for illustrating the method of manufacturing the wavelength conversion member according to Embodiment 1. FIG. 3D is a fourth cross-sectional view for explaining the method of manufacturing the wavelength conversion member according to Embodiment 1. FIG. 3E is a fifth cross-sectional view for illustrating the method of manufacturing the wavelength conversion member according to Embodiment 1. FIG. 3F is a sixth cross-sectional view for illustrating the method of manufacturing the wavelength conversion member according to Embodiment 1. FIG. 3G is a seventh cross-sectional view for illustrating the method of manufacturing the wavelength conversion member according to Embodiment 1. FIG. 4 is a flowchart of the method for manufacturing the wavelength conversion member according to the first embodiment. FIG. 5 is a cross-sectional view of the wavelength conversion member according to the second embodiment. FIG. 6 is a diagram illustrating a configuration of the projector according to the third embodiment. FIG. 7 is an external perspective view of the projector according to the third embodiment.

  Hereinafter, the wavelength conversion member according to the embodiment will be described with reference to the drawings. The embodiment described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangement positions, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, and the overlapping description may be abbreviate | omitted or simplified.

(Embodiment 1)
[Constitution]
First, the structure of the wavelength conversion member according to Embodiment 1 will be described with reference to FIGS. 1 and 2. 1 is an external perspective view of a wavelength conversion member according to Embodiment 1. FIG. 2 is a cross-sectional view (cross-sectional view taken along the line AA in FIG. 1) of the wavelength conversion member according to the first embodiment.

  As shown in FIG. 1, the wavelength conversion member 10 according to the first embodiment is a so-called phosphor wheel provided with a phosphor layer 15 and is mainly used for a projector.

As shown in FIGS. 1 and 2, the wavelength conversion member 10 is more specifically a fluorescent light containing a substrate 11, a dichroic mirror layer 12, a SiO ₂ layer 13, a ZnO layer 14, and a phosphor 16. A body layer 15.

  The substrate 11 is a circular flat substrate. The substrate 11 may have translucency or may not have translucency. Examples of the substrate 11 include a glass substrate, a quartz substrate, a GaN substrate, a sapphire substrate, and a silicon substrate. The substrate 11 may be formed of a resin such as a PEN (polyethylene naphthalate) film or a PET (polyethylene terephthalate) film.

  In the first embodiment, the substrate 11 is a flat plate, but may have a curved surface. When the substrate 11 having a curved surface is used, the substrate 11 is preferably a glass substrate that can be easily processed.

The dichroic mirror layer 12 is an example of a reflective layer that is provided on the substrate 11 and reflects at least part of light from above. In addition, the upper direction here means the SiO ₂ layer 13 side.

  More specifically, the dichroic mirror layer 12 is a multilayer film (distributed Bragg reflection layer) in which low refractive index layers 12a and high refractive index layers 12b are alternately stacked.

Specifically, as the low refractive index layer 12a constituting the dichroic mirror layer 12, a light element oxide such as SiO ₂ and Al ₂ O ₃ can be used. As the high refractive index layer 12b constituting the dichroic mirror layer 12, oxides or oxynitrides of relatively heavy elements such as TiO ₂ , ZnO, and AlON can be used.

  Further, as the low refractive index layer 12a constituting the dichroic mirror layer 12, a nitride semiconductor containing Al such as AlN, high Al composition AlGaN, and AlInN may be used. Further, as the high refractive index layer 12b constituting the dichroic mirror layer 12, a nitride semiconductor containing Ga such as GaN or low Al composition GaN may be used.

  In the first embodiment, the dichroic mirror layer 12 is configured to reflect light in the visible light region, but reflects only light in a specific wavelength region and transmits light in a wavelength region other than the specific wavelength region. It may be a configuration.

The SiO ₂ layer 13 is an amorphous SiO ₂ layer provided on the dichroic mirror layer. That is, the SiO ₂ layer 13 is an example of a light-transmitting amorphous layer. The SiO ₂ layer 13 is a characteristic configuration of the wavelength conversion member 10 and has a good influence on the crystal growth of the ZnO layer 14 on the SiO ₂ layer 13 in forming the phosphor layer 15.

The ZnO layer 14 is an example of a light-transmitting metal oxide layer provided on the SiO ₂ layer 13. More specifically, the ZnO layer 14 is a c-axis oriented ZnO layer. As the ZnO layer 14, for example, ZnO whose in-plane crystal orientation is randomly grown can be used.

  As the ZnO layer 14, single crystal ZnO grown with the in-plane crystal orientation aligned may be used. A single crystal is preferable from the viewpoint of reducing light scattering because it has few crystal grain boundaries.

  The phosphor layer 15 is a ZnO layer containing a plurality of phosphors 16 (phosphor particles) provided on the ZnO layer 14. That is, in the phosphor layer 15, the same metal oxide as that of the ZnO layer 14 is provided between the plurality of phosphors 16. The phosphor layer 15 is formed by depositing a phosphor on the ZnO layer 14 and crystal growth of the ZnO layer 14.

  The phosphor 16 is a YAG-based yellow phosphor in the first embodiment, but may be a red phosphor or a green phosphor, and is not particularly limited. In addition, the phosphor layer 15 may include a plurality of types of phosphors 16 having different center wavelengths of the emission spectrum. The phosphor layer 15 is divided into regions when viewed in a plan view, and the fluorescence that differs for each region. A body 16 may be included.

  When the wavelength conversion member 10 described above is irradiated with blue light on the phosphor layer 15, the phosphor 16 is excited and yellow light is emitted. At this time, part of the blue light and part of the yellow light are reflected by the dichroic mirror layer 12. As a result, blue light and yellow light are mixed, and white light is output from the wavelength conversion member 10.

[Method for producing wavelength conversion member]
Next, the manufacturing method of the wavelength conversion member 10 is demonstrated. 3A to 3G are cross-sectional views for explaining a method of manufacturing the wavelength conversion member 10. FIG. 4 is a flowchart of the method for manufacturing the wavelength conversion member 10.

  In the wavelength conversion member 10 of Embodiment 1, the phosphor layer 15 is formed by filling the voids of the phosphor 16 with ZnO by crystal growth of the ZnO layer 14.

  First, as shown in FIGS. 3A and 3B, the dichroic mirror layer 12 is formed on the substrate 11 (S11).

  When the low refractive index layer 12a and the high refractive index layer 12b constituting the dichroic mirror layer 12 are used, an oxide or oxynitride is used. A film forming method such as a method, a resistance heating vapor deposition method, a reactive plasma vapor deposition method, or a sputtering method is used.

  When a nitride semiconductor is used for the low refractive index layer 12a and the high refractive index layer 12b constituting the dichroic mirror layer 12, a method for forming the low refractive index layer 12a and the high refractive index layer 12b is metal organic vapor phase growth. Or a film forming method such as a molecular beam epitaxy method is used.

Next, as shown in FIG. 3C, the SiO ₂ layer 13 is formed on the dichroic mirror layer 12 (S12). Examples of the method for forming the SiO ₂ layer 13 include an electron beam vapor deposition method, a resistance heating vapor deposition method, a reactive plasma vapor deposition method, a sputtering method, a metal organic vapor phase epitaxy method, a molecular beam epitaxy method, or a pulse laser deposition method. A film forming method is used.

Next, as shown in FIG. 3D, a ZnO layer 14 is formed on the SiO ₂ layer 13 (S12). As a method for forming the ZnO layer 14, a deposition method such as an electron beam vapor deposition method, a resistance heating vapor deposition method, a reactive plasma vapor deposition method, a sputtering method, a metal organic chemical vapor deposition method, a molecular beam epitaxy method, or a pulsed laser deposition method is used. A membrane method is used.

  Here, ZnO can be crystal-grown by a solution growth method using a solution containing Zn ions. The solution growth method includes a chemical bath deposition method performed under atmospheric pressure, a hydrothermal synthesis method performed under atmospheric pressure, or an electrolytic deposition method in which a voltage or current is applied (electrochemical deposition method). ) Etc. are used. Since ZnO is easy to grow c-axis, the c-axis oriented ZnO layer 14 can be easily obtained by controlling film forming conditions such as temperature and film forming speed.

  In order to obtain the ZnO layer 14 having a low electrical resistance, dopants such as Ga, Al, In, and B may be added to the ZnO layer 14.

  Next, as shown in FIG. 3E, the phosphor 16 is deposited on the ZnO layer 14 (S14). As a method for depositing the phosphor 16, for example, a technique of depositing (accumulating) the phosphor 16 on the ZnO layer 14 by electrophoresis using a phosphor dispersion solution in which the phosphor 16 is dispersed is used. . Alternatively, the phosphor 16 may be deposited by allowing the phosphor 16 to settle on the ZnO layer 14. Moreover, the method of apply | coating a fluorescent substance dispersion solution on the ZnO layer 14, and drying a solution may be used.

  In any of the methods, unlike the conventional technique in which a fluorescent layer in which a phosphor is dispersed in a resin matrix is formed, the phosphors 16 aggregate in the phosphor layer 15 to form a structure. As a result, since it is not necessary to control the dispersion of the phosphors 16 in the matrix, the stable phosphor layer 15 that can obtain the necessary fluorescence can be formed only by controlling the amount of the phosphors 16.

  Next, as shown in FIGS. 3F and 3G, the phosphor layer 15 is formed by crystal growth of the ZnO layer 14 (S15). Specifically, by crystal growth of ZnO from the ZnO layer 14 by a solution growth method using a solution containing Zn ions, the voids of the phosphor 16 are filled with ZnO.

  As the solution growth method, a chemical bath deposition method performed at atmospheric pressure, a hydrothermal synthesis method performed at atmospheric pressure or higher, an electrolytic deposition method, and the like are used.

As the crystal growth solution, for example, a zinc nitrate solution containing (CH ₂ ) ₆ N ₄ is used. As an example, the pH of the zinc nitrate solution is 5 or more and 7 or less. The ability to grow in a neutral solution in this way is a characteristic of ZnO not found in other oxides.

  By growing ZnO in a solution near neutrality, unlike glass filling that requires an alkaline reaction solution, there is a low possibility that non-radiative recombination is caused on the surface of the phosphor 16 by chemical etching. For this reason, in the filling of ZnO, a decrease in the internal quantum efficiency of the phosphor 16 is suppressed as compared with the glass filling.

  FIG. 3F is a diagram showing a process in the middle of crystal growth of ZnO from the ZnO layer 14 of FIG. 3E. By using a solution growth method capable of crystal growth in a state close to equilibrium, the ZnO layer 14 is used as a nucleus of crystal growth (that is, a seed crystal), and the ZnO layer 14 in the lower region of the phosphor 16 is sequentially ordered from the ZnO layer 14. Is grown upward. As a result, ZnO formed by crystal growth maintains the crystal state of the ZnO layer 14 that is the base.

  Therefore, a dense ZnO crystal similar to the ZnO layer 14 is formed in the phosphor layer 15. The ZnO formed by crystal growth grows so as to fill the voids of the phosphor 16 and then covers the upper region of the phosphor 16 by lateral growth. Note that a dopant such as Mg may be added to the phosphor layer 15.

  In the solution growth method, since the raw material solution is a dilute aqueous solution and has a low viscosity, it can easily reach the gap between the phosphors 16. In addition, since Zn ions as a raw material for growing ZnO are small, even if Zn ions are consumed by ZnO crystal growth, Zn ions can be easily transferred from the raw material solution outside the phosphor layer 15 to the inside of the phosphor layer 15. Can be spread and reached. Therefore, it is possible to suppress the generation of voids inside the phosphor layer 15 caused by the shortage of raw materials.

[Effects]
In the wavelength conversion member 10, the ZnO layer 14 is provided on the SiO ₂ layer 13. In the wavelength conversion member 10, compared to the case where the SiO ₂ layer 13 is not provided, the crystal growth of the ZnO layer 14 is promoted to enhance the crystallinity of ZnO of the phosphor layer 15, and the phosphor 16 is more closely packed (sealed). Can stop).

When voids are generated in the phosphor layer 15, the light extraction efficiency may deteriorate due to reasons such as an increase in light scattering due to the voids and a decrease in thermal conductivity due to the voids. In the wavelength conversion member 10, the generation of voids in the phosphor layer 15 can be suppressed and the light extraction efficiency can be increased by the SiO ₂ layer 13.

The SiO ₂ layer 13 is provided between the phosphor layer 15 and the dichroic mirror layer 12. Here, the SiO ₂ layer 13 causes heat generated in the phosphor layer 15 to the dichroic mirror layer 12 when the wavelength conversion member 10 is irradiated with blue light (hereinafter also referred to as using the wavelength conversion member 10). It also functions as a barrier layer that reduces the influence. Thereby, deterioration by the heat | fever of the dichroic mirror layer 12 can be suppressed, and durability (reliability) can be improved.

If the thickness of the SiO ₂ layer 13 is too thin, the effect of increasing the crystallinity of ZnO in the phosphor layer 15 may not be sufficiently obtained. Therefore, the thickness of the SiO ₂ layer 13 is preferably equal to or greater than the thickness of the low refractive index layer 12a included in the dichroic mirror layer 12, for example.

Further, when the thickness of the SiO ₂ layer 13 is too thin, the deterioration of the thermal conductivity of the SiO ₂ layer 13, the temperature of the phosphor layer 15 is increased during use of the wavelength conversion member 10, light emitted from the phosphor 16 It may also cause a decrease in efficiency. In such a case, an upper limit may be provided for the thickness of the SiO ₂ layer 13. The thickness of the SiO ₂ layer 13 is specifically assumed to be about 50 nm to 200 nm.

(Embodiment 2)
In the first embodiment, the dichroic mirror layer 12 is used as the reflective layer, but a metal reflective layer may be used as the reflective layer. In the second embodiment, a wavelength conversion member 10a including a metal reflection layer including an Al reflection layer will be described as an example of the metal reflection layer. In the following second embodiment, differences from the first embodiment will be mainly described, and description of the same contents as those in the first embodiment will be omitted.

[Constitution]
First, the structure of the wavelength conversion member according to Embodiment 2 will be described with reference to FIG. FIG. 5 is a cross-sectional view of the wavelength conversion member according to the second embodiment.

As shown in FIG. 5, the wavelength conversion member 10 a includes a substrate 11, a metal reflection layer 17, a SiO ₂ layer 13, a ZnO layer 14, and a phosphor layer 15 containing a phosphor 16.

  The metal reflection layer 17 has an increased reflection layer 18 including a low refractive index layer 18a and a high refractive index layer 18b on the top, and includes an Al reflection layer 19b. The metal reflection layer 17 also includes an Nb adhesion film 19a.

  The Nb adhesion film 19a is a layer for improving the adhesion of the Al reflective layer 19b to the substrate 11. The Nb adhesion film 19a is formed on the substrate 11.

  The Al reflective layer 19b is a reflective layer made of Al. The Al reflective layer 19b is formed on the Nb adhesion film 19a.

The increased reflection layer 18 is a layer for reducing light scattering loss generated at the interface between the Al reflection layer 19b and the SiO ₂ layer 13, and is formed on the Al reflection layer 19b. The increased reflection layer 18 includes a low refractive index layer 18a and a high refractive index layer 18b.

Specifically, light element oxides such as SiO ₂ and Al ₂ O ₃ are used as the low refractive index layer 18a. As the high refractive index layer 18b, an oxide or oxynitride of a relatively heavy element such as TiO ₂ , ZnO, and AlON can be used.

  Note that the Nb adhesion film 19a and the increased reflection layer 18 may not be provided.

[Effects]
Also in the wavelength conversion member 10 a, the ZnO layer 14 is provided on the SiO ₂ layer 13. Thereby, the crystal growth of the ZnO layer 14 is promoted, the crystallinity of ZnO in the phosphor layer 15 is enhanced, and the phosphor 16 can be filled (sealed) more densely. That is, in the wavelength conversion member 10a, the generation | occurrence | production of the space | gap in the fluorescent substance layer 15 can be suppressed, and light extraction efficiency can be improved.

The SiO ₂ layer 13 is provided between the phosphor layer 15 and the Al reflective layer 19b. Here, the SiO ₂ layer 13 also functions as a barrier layer that reduces the influence of heat generated in the phosphor layer 15 on the Al reflective layer 19b during use of the wavelength conversion member 10a. Thereby, deterioration by the heat | fever of the Al reflection layer 19b can be suppressed, and durability (reliability) can be improved.

Incidentally, SiO ₂ layer 13, not only heat, by blocking the transfer of oxygen to the Al reflective layer 19b, is considered to exhibit also the effect of suppressing deterioration of the (reduction in reflectance by oxidation).

In addition, when the thickness of the SiO ₂ layer 13 is too thin, the effect of suppressing the oxidation of the Al reflective layer 19b may not be sufficiently obtained. Therefore, the thickness of the SiO ₂ layer 13 is preferably equal to or greater than the thickness of the low refractive index layer 18 a included in the metal reflective layer 17, for example.

(Embodiment 3)
[Constitution]
The present invention may be realized as a projector using the wavelength conversion member of the above embodiment. Hereinafter, the projector according to Embodiment 3 will be described with reference to FIG. FIG. 6 is a diagram illustrating a configuration of the projector according to the third embodiment.

  In the third embodiment, the dichroic mirror layer 12 of the wavelength conversion member 10 has characteristics of reflecting yellow light emitted from the phosphor 16 and transmitting blue light, and the substrate 11 is made of transparent material such as sapphire. The description will be made assuming that the substrate is a substrate.

  As shown in FIG. 6, the projector 20 includes a light emitting device 200, an optical unit 300, and a control unit 400.

  The light emitting device 200 is a device that operates as a light source of the projector 20. The light emitting device 200 includes a wavelength conversion member 10 and an irradiation unit 100. The light emitting device 200 includes a dichroic mirror 220, a reflection mirror 231, a reflection mirror 232, and a reflection mirror 233.

  The wavelength conversion member 10 is attached to the motor 213 and rotated. The motor 213 is driven based on a drive control signal from the control unit 400.

  The irradiation unit 100 irradiates the wavelength conversion member 10 with light for exciting the phosphor 16 from the phosphor layer 15 side. More specifically, the irradiation unit 100 includes a plurality of semiconductor light emitting elements 111 (excitation light sources), a collimating lens 120 that collimates light emitted from the semiconductor light emitting elements 111, and a heat sink 130.

  The semiconductor light emitting element 111 is, for example, a semiconductor laser or an LED, and is driven by a driving current to emit light of a predetermined color (wavelength). In the third embodiment, a semiconductor laser that emits blue light having a wavelength of 360 nm or more and 480 nm or less is used as the semiconductor light emitting element 111. The light emission control of the semiconductor light emitting element 111 is performed by the control unit 400. In addition, although the semiconductor light emitting element 111 is provided with two or more, one piece may be sufficient.

  The dichroic mirror 220 transmits blue light (excitation light) emitted from the irradiation unit 100 and reflects light having a longer wavelength than the blue light. That is, the dichroic mirror 220 reflects yellow light from the wavelength conversion member 10.

  The optical unit 300 includes a condenser lens 310, a rod integrator 320, a lens group 330, a projection lens 340, and a display element 350.

  The condensing lens 310 condenses the light from the light emitting device 200 on the incident end face of the rod integrator 320.

  The rod integrator 320 receives the light collected by the condensing lens 310 at the incident end face and emits it with a uniform luminance distribution. The rod integrator 320 is, for example, a quadrangular prism, and light incident on the rod integrator 320 is emitted as a uniform luminance distribution by repeating total reflection in the medium.

  The lens group 330 causes the light emitted from the rod integrator 320 to enter the display element 350. The lens group 330 is a lens unit including a plurality of lenses, and includes, for example, a condenser lens and a relay lens.

  The projection lens 340 is a lens that projects the light output from the display element 350 to the outside of the projector 20. The projection lens 340 is a projection lens group (projection unit) including one or a plurality of lenses, and includes, for example, a biconvex lens, a diaphragm, and a plano-concave lens.

  The display element 350 controls the light emitted from the lens group 330 and outputs it as an image. Specifically, the display element 350 is a DMD (digital mirror device) used as an image element.

  The control unit 400 is a control unit that controls the light emitting device 200 (the irradiation unit 100 and the motor 213) and the display element 350. Specifically, the control unit 400 is realized by a microcomputer, a processor, a dedicated circuit, or the like.

[Operation]
Next, the operation of the projector 20 will be described.

  The blue light emitted from the irradiation unit 100 passes through the dichroic mirror 220 and enters the wavelength conversion member 10. At this time, the wavelength conversion member 10 transmits blue light and reflects yellow light due to the characteristics of the dichroic mirror layer 12. That is, the wavelength conversion member 10 emits yellow light toward the dichroic mirror 220 and emits blue light toward the reflection mirror 231. At this time, the wavelength conversion member 10 is rotated by the motor 213.

  The yellow light reflected by the wavelength conversion member 10 is reflected by the dichroic mirror 220 and guided to the optical unit 300. On the other hand, the blue light transmitted through the wavelength conversion member 10 is sequentially reflected by the reflection mirror 231, the reflection mirror 232, and the reflection mirror 233, and is transmitted through the dichroic mirror 220 and guided to the optical unit 300. That is, white light in which blue light and yellow light are mixed is incident on the optical unit 300.

  White light incident on the optical unit 300 enters the display element 350 through the condenser lens 310, the rod integrator 320, and the lens group 330, and is formed into an image (video light) based on the video signal from the control unit 400. And output from the display element 350. Note that the image in this case is monochrome.

  The image output from the display element 350 is projected from the projection lens 340 onto an object such as a screen.

  In the projector 20, as shown in FIG. 7, the light emitting device 200, the optical unit 300, and the control unit 400 are housed in a housing 500. FIG. 7 is an external perspective view of the projector 20.

[Summary]
As described above, the present invention can be realized as the projector 20 using the wavelength conversion member 10. That is, according to the wavelength conversion member 10, the projector 20 with improved light extraction efficiency and durability is realized.

  The projector 20 is an example, and the wavelength conversion member of the present invention exemplified by the wavelength conversion member 10 and the wavelength conversion member 10a can be used for a projector using existing various optical systems.

  Further, the present invention may be realized as a light emitting device (for example, the light emitting device 200) used in the projector.

(Other embodiments)
While the first to third embodiments have been described above, the present invention is not limited to the above embodiment.

In the above embodiment, the SiO ₂ layer 13 (SiO ₂ amorphous layer) is exemplified as the amorphous layer, but the amorphous layer may be another amorphous layer such as an amorphous layer made of TiO ₂ , for example. .

  In the said embodiment, although the ZnO layer 14 was illustrated as a metal oxide layer, the layer comprised by the other metal oxide may be sufficient as a metal oxide layer.

  Although the wavelength conversion member for projector use has been described in the above embodiment, the use of the wavelength conversion member is not particularly limited. The wavelength conversion member of the present invention may be used for other applications such as illumination or display.

  The stacked structure shown in the cross-sectional view of the above embodiment is an example, and the present invention is not limited to the stacked structure. That is, the present invention also includes a stacked structure that can realize the characteristic functions of the present invention, as in the above-described stacked structure. For example, another layer may be provided between the layers of the stacked structure as long as the same function as the stacked structure can be realized.

  In the above embodiment, the main material constituting each layer of the laminated structure is illustrated, but other materials may be included as long as the same function as that of the laminated structure can be realized.

  In addition, this invention is not limited to these embodiment or its modification. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art are applied to the present embodiment or the modification thereof, or a form constructed by combining different embodiments or components in the modification. It is included within the scope of the present invention.

10, 10a Wavelength conversion member 11 Substrate 12 Dichroic mirror layer 12a, 18a Low refractive index layer 12b, 18b High refractive index layer 13 SiO ₂ layer 14 ZnO layer 15 Phosphor layer 16 Phosphor 17 Metal reflective layer 18 Increased reflective layer 19b Al Reflective layer 20 Projector 100 Irradiation unit 200 Light emitting device

Claims (13)

A substrate,
A reflective layer that is provided on the substrate and reflects at least part of light from above;
An amorphous layer having translucency provided on the reflective layer;
A translucent metal oxide layer provided on the amorphous layer;
A phosphor layer containing a plurality of phosphors provided on the metal oxide layer,
In the phosphor layer, the same metal oxide as the metal oxide layer is provided between the plurality of phosphors. The wavelength conversion member according to claim 1, wherein the reflection layer is a dichroic mirror layer. The dichroic mirror layer includes a low refractive index layer and a high refractive index layer,
The wavelength conversion member according to claim 2, wherein a thickness of the amorphous layer is equal to or greater than a thickness of the low refractive index layer. The wavelength conversion member according to claim 1, wherein the reflection layer is a metal reflection layer. The metal reflection layer includes an increased reflection layer including a low refractive index layer and a high refractive index layer,
The wavelength conversion member according to claim 4, wherein a thickness of the amorphous layer is equal to or greater than a thickness of the low refractive index layer. The wavelength conversion member according to claim 4, wherein the metal reflection layer includes a reflection layer made of Al. The wavelength conversion member according to claim 1, wherein the amorphous layer is an amorphous layer made of SiO ₂ or TiO ₂ . The wavelength conversion member according to claim 1, wherein the metal oxide layer is a ZnO layer. The low refractive index layer is a layer made of SiO ₂ or Al ₂ O ₃ ,
The wavelength conversion member according to claim ₃ , wherein the high refractive index layer is a layer made of TiO ₂ or Nb ₂ O ₃ . The wavelength conversion member according to claim 1, wherein the substrate is a sapphire substrate or a silicon substrate. The wavelength conversion member according to any one of claims 1 to 10,
An illuminating device that irradiates the wavelength conversion member with light that excites the phosphor.   A projector comprising the light emitting device according to claim 11. Forming a reflective layer on the substrate that reflects at least part of the light from above;
An amorphous layer having translucency is formed on the reflective layer;
Forming a translucent metal oxide layer on the amorphous layer;
Depositing a plurality of phosphors on the metal oxide layer;
A method for producing a wavelength conversion member, wherein the phosphor layer in which the same metal oxide as the metal oxide layer is provided between the plurality of phosphors is formed by crystal growth of the metal oxide layer.

Images