Wavelength conversion composite component, light emitting device and electronic device using the same

Abstract

The wavelength conversion composite component (10) comprises: a disc-shaped substrate (13); a first wavelength conversion component (11) containing a first phosphor emitting fluorescence due to a parity-forbidden transition, which is arranged on the substrate; and a second wavelength conversion component (12) containing a second phosphor emitting fluorescence due to a parity-allowed transition, which is arranged on the substrate. The first wavelength conversion component and the second wavelength conversion component are arranged adjacent to each other along the circumferential direction of the substrate. The first wavelength conversion component and the second wavelength conversion component are arranged on the substrate in such a way that the center of gravity (G) of the first wavelength conversion component and the second wavelength conversion component as a whole is located on the rotation axis (R) of the substrate. The light-emitting device (100) comprises a wavelength conversion composite component.

Description

Technical Field

[0001] The present invention relates to a wavelength conversion composite component and a light emitting device and electronic equipment using the same. Background Art

[0002] In the past, there is a known light-emitting device that combines a solid light-emitting element that emits primary light such as laser light and a wavelength conversion component that includes a phosphor. As such a light-emitting device, for example, a laser lighting device and a laser projector are known. In addition, a wavelength conversion component in the form of a phosphor wheel that is rotated by a motor is used in the light-emitting device.

[0003] Patent document 1 discloses a light source device having a light source and a phosphor wheel having a first substrate and a second substrate. The phosphor wheel has a first phosphor and a second phosphor disposed between the first substrate and the second substrate, and the first phosphor and the second phosphor are disposed at different positions in the rotation direction of the phosphor wheel. In addition, the first phosphor is in contact with the first substrate and the second substrate, and the second phosphor is in contact with the second substrate. With such a structure, the light source is not easily affected by the heat generated by the phosphor, and the decrease in luminous efficiency is suppressed.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-161709 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In Patent Document 1, when the first phosphor and the second phosphor are observed along the rotation axis of the phosphor wheel, the area of ​​the first phosphor is smaller than the area of ​​the second phosphor, and the thickness of the first phosphor is larger than the thickness of the second phosphor. In addition, when observed along the rotation axis, there are areas on the first substrate and the second substrate where the first phosphor and the second phosphor are not in contact, that is, areas where there are no phosphors. Therefore, there is a case where the center of gravity of the phosphor layer composed of the first phosphor and the second phosphor exists at a position deviated from the rotation axis of the phosphor wheel. Therefore, when the phosphor wheel of Patent Document 1 is rotated by a rotation drive device, the rotation of the phosphor wheel is unstable due to the deviation between the rotation axis and the center of gravity, so there is a problem that it cannot rotate at high speed. In addition, when the rotation of the phosphor wheel is unstable, there is a problem that the rotation drive device may malfunction.

[0009] The present invention is made in view of the problems of the prior art, and an object of the present invention is to provide a wavelength conversion composite component that can smoothly rotate a substrate having a wavelength conversion component to improve reliability, and a light emitting device and an electronic device using the wavelength conversion composite component.

[0010] In order to solve the problem, the wavelength conversion composite component of the first technical solution of the present invention comprises: a disc-shaped substrate; a first wavelength conversion component, which contains a first phosphor that emits fluorescence caused by a parity-forbidden transition and is arranged on the substrate; and a second wavelength conversion component, which contains a second phosphor that emits fluorescence caused by a parity-allowed transition and is arranged on the substrate. The first wavelength conversion component and the second wavelength conversion component are arranged adjacent to each other along the circumferential direction of the substrate. The first wavelength conversion component and the second wavelength conversion component are arranged on the substrate in such a way that the center of gravity of the first wavelength conversion component and the second wavelength conversion component as a whole exists on the rotation axis of the substrate.

[0011] A light emitting device according to a second aspect of the present invention includes the above-mentioned wavelength conversion composite component.

[0012] An electronic device according to a third aspect of the present invention includes the above-mentioned light emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 (a) is a schematic diagram showing a light-emitting device having a wavelength conversion member including a phosphor that emits fluorescence due to parity-allowed transition. Figure 1 (b) is a schematic diagram showing a light emitting device having a wavelength conversion member including a phosphor that emits fluorescence due to parity forbidden transition.

[0014] Figure 2 This is a schematic diagram showing a light emitting device including both a wavelength conversion component including a phosphor that emits fluorescence due to parity-allowed transition and a wavelength conversion component including a phosphor that emits fluorescence due to parity-forbidden transition.

[0015] Figure 3 It is a plan view schematically showing an example of a wavelength conversion composite component according to the present embodiment.

[0016] Figure 4 This is a diagram schematically showing another example of the wavelength conversion composite component according to the present embodiment. Figure 4 (a) is a top view, Figure 4 (b) is a cross-sectional view.

[0017] Figure 5 It is a diagram schematically showing a wavelength conversion composite component according to a comparative example. Figure 5 (a) is a top view, Figure 5 (b) is a cross-sectional view.

[0018] Figure 6 It is a plan view schematically showing another example of the wavelength conversion composite component according to the present embodiment.

[0019] Figure 7 It is a plan view schematically showing another example of the wavelength conversion composite component according to the present embodiment.

[0020] Figure 8 It is a plan view schematically showing another example of the wavelength conversion composite component according to the present embodiment.

[0021] Fig. 9 This is a cross-sectional view schematically showing a light emitting device using a wavelength conversion composite component in which a first wavelength conversion member and a second wavelength conversion member have different heights.

[0022] Fig.10 This is a cross-sectional view showing an example in which the first wavelength conversion member and the second wavelength conversion member are at the same height in the wavelength conversion composite member according to the present embodiment.

[0023] Fig.11 This is a schematic diagram showing an example of a light emitting device according to this embodiment.

[0024] Fig.12 This is a schematic diagram showing an example of an electronic device according to the present embodiment.

[0025] Fig.13 It is a perspective view schematically showing another example of the electronic device according to the present embodiment. DETAILED DESCRIPTION

[0026] Hereinafter, the wavelength conversion composite component according to the present embodiment, and the light emitting device and electronic device using the wavelength conversion composite component will be described in detail using the drawings. In addition, for the sake of convenience of description, the dimensional ratios of the drawings are exaggerated and may differ from the actual ratios.

[0027] As a light-emitting device composed of a light-emitting element and a phosphor, Figure 1 As shown, there can be mentioned a structure including a solid-state light emitting element 2 that radiates primary light, a wavelength conversion member 3 containing a phosphor, and a substrate 4 that holds the wavelength conversion member 3 on the surface.

[0028] The solid light emitting element 2 is a light emitting element that emits laser light L as primary light, and for example, a laser diode such as a surface emitting laser diode can be used. The wavelength conversion component 3 emits fluorescence F having a wavelength longer than that of the laser light L by receiving the laser light L. That is, the wavelength conversion component 3 receives the laser light L with the front surface 3a and emits the fluorescence F from the back surface 3b. The substrate 4 has a transparency that allows the laser light L to pass through, so that the laser light L incident from the main surface 4a as the surface of the substrate 4 is transmitted. As the transparent substrate 4, for example, a quartz substrate, a sapphire substrate, or a light-transmitting fluorescent ceramic substrate is used.

[0029] In such a light emitting device 1, the laser light L irradiated onto the substrate 4 passes through the substrate 4 and the wavelength conversion member 3. When the laser light L passes through the wavelength conversion member 3, the phosphor contained in the wavelength conversion member 3 absorbs a part of the laser light L and emits fluorescence F. Thus, the light emitting device 1 emits light containing the laser light L and the fluorescence F as output light. Therefore, for example, when the laser light L is blue and the fluorescence F is yellow, white output light is emitted by additive color mixing of the laser light L and the fluorescence F.

[0030] Here, when the phosphor included in the wavelength conversion member 3 (3A) is a phosphor that emits fluorescence due to parity-allowed transition, the phosphor can effectively absorb the laser light L because of its high transition probability. 3+ Activated yttrium aluminum garnet (Y3Al2(AlO4)3:Ce 3+ , YAG:Ce 3+ ), the phosphor absorbs about 90% of the blue laser light L and emits yellow fluorescence F. Figure 1 As shown in (a), in the light emitting device 1, when the phosphor included in the wavelength conversion member 3A is a phosphor that emits fluorescence due to parity allowed transition, the thickness of the wavelength conversion member 3A can be made relatively thin. Specifically, the thickness t1 of the wavelength conversion member 3A can be set to 50 μm to 100 μm, for example.

[0031] On the other hand, when the phosphor included in the wavelength conversion member 3 (3B) emits fluorescence due to parity forbidden transition, the phosphor cannot effectively absorb the laser light L because of its low transition probability. 3+ Activated (Gd, La)3(Ga, Sc)2(GaO4)3:Cr 3+ In the case of a phosphor (GSG phosphor), the phosphor absorbs about 60% of the blue laser light L and emits near-infrared fluorescence F. Figure 1As shown in (b), in the light emitting device 1A, when the phosphor included in the wavelength conversion member 3B is a phosphor that emits fluorescence due to parity forbidden transition, the thickness of the wavelength conversion member 3B needs to be relatively thick to improve the wavelength conversion efficiency. Specifically, the thickness t2 of the wavelength conversion member 3B needs to be set to 300 μm to 400 μm, for example.

[0032] Here, by combining the above-mentioned solid light emitting element 2, wavelength conversion component 3A and wavelength conversion component 3B, a light emitting device that emits both white light and near infrared light as output light can be obtained. Specifically, a light emitting element that emits blue laser light L is used as the solid light emitting element 2, and a YAG:Ce 3+ The wavelength conversion component 3A is a component containing a phosphor, and the wavelength conversion component 3B is a component containing a GSG phosphor. Figure 2 As shown in FIG. 4 , the wavelength conversion member 3A and the wavelength conversion member 3B are stacked on the transparent substrate 4. Figure 2 In the light emitting device 1B shown in (a), the wavelength conversion member 3A is stacked on the substrate 4, and the wavelength conversion member 3B is stacked on the wavelength conversion member 3A. Figure 2 In the light emitting device 1C shown in (b), the wavelength conversion member 3B is stacked on the substrate 4, and the wavelength conversion member 3A is stacked on the wavelength conversion member 3B.

[0033] When such light emitting devices 1B and 1C are irradiated with blue laser light L from the main surface (lower surface) 4a of the substrate 4, the irradiated laser light L passes through the substrate 4 and the wavelength conversion components 3A and 3B. When the laser light L passes through the wavelength conversion component 3A, the YAG:Ce contained in the wavelength conversion component 3A 3+ The phosphor absorbs part of the laser light L and emits yellow fluorescence. When the laser light L passes through the wavelength conversion member 3B, the GSG phosphor contained in the wavelength conversion member 3B absorbs part of the laser light L and emits near-infrared fluorescence. Figure 2 The light emitting device can emit from the light emitting surface O both white light and near-infrared light generated by additive mixing of laser light L and yellow fluorescence.

[0034] As described above, since the phosphor included in the wavelength conversion member 3A emits fluorescence due to parity-allowed transition, the thickness of the wavelength conversion member 3A can be made relatively thin. In contrast, since the phosphor included in the wavelength conversion member 3B emits fluorescence due to parity-forbidden transition, the thickness of the wavelength conversion member 3B needs to be made relatively thick to improve the wavelength conversion efficiency. Figure 2In the light emitting device 1B shown in (a), the yellow fluorescence emitted from the wavelength conversion member 3A is blocked by the thick film of the wavelength conversion member 3B, and sometimes cannot fully pass through the wavelength conversion member 3B. Figure 2 In the light emitting device 1C shown in (b), the laser light L having passed through the base material 4 is absorbed by the wavelength converting member 3B and may not sufficiently reach the wavelength converting member 3A.

[0035] so, Figure 2 The light emitting devices 1B and 1C shown have the wavelength converting member 3A and the wavelength converting member 3B stacked in the thickness direction of the substrate 4. Therefore, there is a problem that the white light extraction efficiency is reduced due to the thick wavelength converting member 3B.

[0036] The wavelength conversion composite component of this embodiment has a structure capable of improving light extraction efficiency even when including both a wavelength conversion component including a phosphor emitting fluorescence due to parity-allowed transition and a wavelength conversion component including a phosphor emitting fluorescence due to parity-forbidden transition.

[0037] [Wavelength conversion composite component]

[0038] like Figure 3 As shown, the wavelength conversion composite component of this embodiment includes a disk-shaped substrate 13 and a first wavelength conversion member 11 and a second wavelength conversion member 12 provided on the substrate 13. The first wavelength conversion member 11 and the second wavelength conversion member 12 are fixed to one main surface 13a of the substrate 13.

[0039] The first wavelength conversion member 11 and the second wavelength conversion member 12 are arc-shaped in a plan view, and are arranged adjacent to each other along the circumferential direction of the substrate 13. Figure 3 In the wavelength conversion composite component 10 shown, the first wavelength conversion component 11 and the second wavelength conversion component 12 are each divided into two and have an arc shape. In addition, the first wavelength conversion component 11 and the second wavelength conversion component 12 are alternately arranged along the periphery of the substrate 13 to form an annular wavelength conversion component as a whole.

[0040] In addition, Figure 3 In the embodiment, the first wavelength conversion member 11 and the second wavelength conversion member 12 are in contact with each other to form an annular shape, but a gap may exist between the first wavelength conversion member 11 and the second wavelength conversion member 12 .

[0041] The first wavelength conversion member 11 contains a first phosphor that emits fluorescence due to parity forbidden transition. As the first phosphor, a phosphor that emits fluorescence based on the electron energy transition of a transition metal ion can be used. For example, a phosphor containing at least one ion selected from the group consisting of Cr, Mn, Fe, Cu, and Ni as an activator can be used. Specifically, as the first phosphor, a phosphor containing Cr can be used. 3+ and Mn 4+ The first phosphor is a phosphor that uses at least one of the two as an activator. Since the emission of the first phosphor is caused by parity forbidden transition, the absorption rate of the excitation light will decrease. In addition, the matrix of the first phosphor is not particularly limited, and for example, at least one selected from the group consisting of oxides, sulfides, nitrides, halides, sulfur oxides, nitrogen oxides and halogen oxides can be used.

[0042] Specifically, the activator of the first phosphor is a fluorescent ion having the property of absorbing the excitation light (primary light) emitted from the solid-state light emitting element and converting it into a light component with a wavelength longer than the excitation light. Furthermore, the activator of the first phosphor is an ion capable of emitting fluorescence due to parity forbidden transition, for example, Cr 3+ and Mn 4+ at least one party.

[0043] As the first phosphor, there are halogenated phosphates, phosphates, halogenated silicates, silicates, aluminates, aluminosilicates, borates, germanates, nitrided silicates, nitrided aluminum silicates, oxynitrided silicates, oxynitrided aluminum silicates, etc. to which the above-mentioned activator is added. Therefore, the first phosphor can be appropriately selected from these substances that are suitable for lighting design.

[0044] Here, the activator of the first phosphor is preferably Cr 3+ By using Cr 3+ , a first phosphor having the property of absorbing visible light, especially blue light or red light, and converting it into a light component of deep red to near infrared can be obtained. In addition, depending on the type of the matrix to which the activator is added, it becomes easy to change the light absorption peak wavelength and fluorescence peak wavelength of the phosphor, and it becomes advantageous in changing the shape of the excitation spectrum and the shape of the fluorescence spectrum. Furthermore, it is also known that there are many Cr-doped phosphors that absorb blue light and red light and convert them into near infrared fluorescent components. 3+ Therefore, not only the selection range of the solid light-emitting element emitting primary light is widened, but also the peak wavelength of the fluorescence emitted by the first phosphor can be easily changed, so that it becomes a light-emitting device that is advantageous for controlling the spectral distribution of the output light.

[0045] In addition, the fluorescent ion is Cr 3+The phosphor is not particularly limited as long as it absorbs the excitation light and converts it into fluorescence with a wavelength longer than the excitation light. 3+ The activated phosphor can be appropriately selected. 3+ The activated phosphor is preferably a phosphor based on a complex metal oxide that is easy to produce.

[0046] Cr 3+ The activated phosphor is preferably a composite oxide phosphor having a garnet-type crystal structure, which has many practical examples. 3+ Activated garnet phosphors can be used from Y3Al2(AlO4)3:Cr 3+ 、La3Al2(AlO4)3:Cr 3+ 、Gd3Al2(AlO4)3:Cr 3+ 、Y3Ga2(AlO4)3:Cr 3+ 、La3Ga2(AlO4)3:Cr 3+ 、Gd3Ga2(AlO4)3:Cr 3 + 、Y3Sc2(AlO4)3:Cr 3+ 、La3Sc2(AlO4)3:Cr 3+ 、Gd3Sc2(AlO4)3:Cr 3+ 、Y3Ga2(GaO4)3:Cr 3+ 、La3Ga2(GaO4)3:Cr 3+ 、(Gd,La)3Ga2(GaO4)3:Cr 3+ 、Gd3Ga2(GaO4)3:Cr 3+ 、Y3Sc2(GaO4)3:Cr 3+ 、La3Sc2(GaO4)3:Cr 3+ 、Gd3Sc2(GaO4)3:Cr 3+ , and (Gd, La)3 (Ga, Sc)2 (GaO4)3: Cr 3+ At least one selected from the group consisting of. 3+ The activated garnet phosphor may also be a solid solution formed with these phosphors as end-member components.

[0047] The first wavelength conversion component 11 can be manufactured by sealing the first phosphor with a sealing material. The sealing material is preferably at least one of an organic material and an inorganic material, in particular at least one of a transparent (light-transmitting) organic material and a transparent (light-transmitting) inorganic material. As a sealing material of an organic material, for example, a transparent organic material such as silicone resin can be listed. As a sealing material of an inorganic material, for example, a transparent inorganic material such as low-melting-point glass can be listed.

[0048] In addition, a sintered body formed by sintering the first phosphor and having a plurality of voids inside can be used as the first wavelength conversion member 11. Furthermore, a ceramic body formed by sintering the first phosphor and not having a plurality of voids inside can be used as the first wavelength conversion member 11. Since the first wavelength conversion member 11 is such a sintered body or a ceramic body, the manufacture and handling of the first wavelength conversion member 11 become easy, so it is a wavelength conversion member suitable for industrial production.

[0049] The second wavelength conversion member 12 contains a second phosphor that emits fluorescence due to parity-allowed transition. As such a second phosphor, a phosphor containing Ce 3+ 、Eu 2+ Yb 2+ At least one phosphor selected from the group consisting of isocyanate is used as an activator. Since the emission of the second phosphor is caused by parity-allowed transition, the absorption rate of the excitation light is high. In addition, the matrix of the second phosphor is not particularly limited, and for example, at least one selected from the group consisting of oxides, sulfides, nitrides, halides, sulfur oxides, nitrogen oxides and halogen oxides can be used.

[0050] Specifically, the activator of the second phosphor is a fluorescent ion having the property of absorbing the excitation light (primary light) emitted from the solid-state light emitting element and converting it into a light component with a wavelength longer than the excitation light. Furthermore, the activator of the second phosphor is an ion capable of emitting fluorescence due to parity-allowed transition, and is preferably, for example, an ion derived from Ce 3+ 、Eu 2+ Yb 2+ At least one selected from the group consisting of.

[0051] As the second phosphor, there are halophosphates, phosphates, halosilicates, silicates, aluminates, aluminosilicates, borates, germanates, nitrided silicates, nitrided aluminum silicates, oxynitrided silicates, oxynitrided aluminum silicates, etc. to which the above-mentioned activator is added. Therefore, the second phosphor can be appropriately selected from these substances that are suitable for lighting design.

[0052] In addition, a particularly preferred phosphor as the second phosphor is a phosphor having a garnet-type crystal structure and covered with Ce. 3+ Activated composite oxide phosphor. As such Ce 3+ Activated garnet phosphors can be used from Lu3Al2(AlO4)3:Ce 3+ 、Y3Al2(AlO4)3:Ce 3+ 、Lu3Ga2(AlO4)3:Ce 3+ and Y3Ga2(AlO4)3:Ce 3+At least one compound selected from the group consisting of. 3+ The activated garnet phosphor may also be a solid solution having these phosphors as end-member components.

[0053] The Ce 3+ Most activated garnet phosphors have the property of absorbing blue light and converting it into yellow to green light. 3+ Most activated garnet phosphors have the property of absorbing blue light or red light and converting it into deep red to near infrared light. 3+ Activated garnet phosphor and Ce as the second phosphor 3+ By activating the garnet phosphor, it is possible to obtain output light including light components of the three primary colors constituting light and a near-infrared light component.

[0054] The second wavelength conversion member 12 can also be manufactured by sealing the second phosphor with a sealing material, similarly to the first wavelength conversion member 11. In addition, a sintered body having a plurality of voids inside the sintered second phosphor can be used as the second wavelength conversion member 12. Furthermore, a ceramic body having no plurality of voids inside the sintered second phosphor can also be used as the second wavelength conversion member 12.

[0055] In the wavelength conversion composite component 10, the disk-shaped substrate 13 has a through hole 13b at the center portion that is directly or indirectly connected to the output shaft of a rotation drive device such as a motor. In addition, the substrate 13 can use a substrate having the following properties: the excitation light emitted from the solid light emitting element and the fluorescence emitted from the first wavelength conversion component 11 and the second wavelength conversion component 12 are reflected. That is, the substrate 13 can be a substrate with light reflectivity. Such a substrate 13 is not particularly limited, for example, a substrate composed of metal can be used, and specifically, a substrate composed of aluminum can be used.

[0056] In addition, the substrate 13 may be a substrate having the following properties: it transmits the excitation light emitted from the solid-state light emitting element and the fluorescence emitted from the first wavelength conversion component 11 and the second wavelength conversion component 12. That is, the substrate 13 may be a substrate having light transmissivity. Such a substrate 13 is not particularly limited, and for example, a substrate composed of quartz, sapphire, or light transmissive fluorescent ceramics may be used.

[0057] Here, when the substrate 13 has light reflectivity, when the first and second wavelength conversion members 11 and 12 are irradiated with excitation light, the output light is radiated in the direction opposite to the irradiation direction of the excitation light. Figure 4The wavelength conversion composite component 10A shown in (b) is configured to emit output light upward when the excitation light is irradiated from above to below the first and second wavelength conversion components 11 and 12. Specifically, when the excitation light is irradiated from above to the main surface 13c (upper surface) of the substrate 13 having light reflectivity, the excitation light is irradiated on the first and second wavelength conversion components 11 and 12. Then, the output light is irradiated upward from the first and second wavelength conversion components 11 and 12.

[0058] On the other hand, when the substrate 13 is light-transmissive, when the first and second wavelength conversion members 11 and 12 are irradiated with excitation light, output light is radiated in the same direction as the irradiation direction. Figure 4 In the wavelength conversion composite component 10A shown in (b), when the excitation light is irradiated from the bottom to the top to the first and second wavelength conversion components 11 and 12, the output light is radiated upward. Specifically, when the excitation light is irradiated from the other main surface 13c (lower surface) of the substrate 13 having light transmittance, the excitation light passes through the substrate 13 and irradiates the first and second wavelength conversion components 11 and 12. Then, the output light is radiated upward from the first and second wavelength conversion components 11 and 12.

[0059] As described above, in the wavelength conversion composite component 10, the first wavelength conversion component 11 and the second wavelength conversion component 12 are arranged in an annular shape on the main surface 13a of the disk-shaped substrate 13. Therefore, by rotating the wavelength conversion composite component 10 by the rotation drive device, it is possible to radiate output light including both the fluorescence emitted from the first wavelength conversion component 11 and the fluorescence emitted from the second wavelength conversion component 12. In addition, by rotating the wavelength conversion composite component 10, it is possible to expand the effective surface area of ​​the phosphors included in the first wavelength conversion component 11 and the second wavelength conversion component 12, and promote heat exchange with the air. As a result, it is possible to suppress the temperature extinction of the first phosphor and the second phosphor, and effectively perform the light emission of the phosphors.

[0060] Here, in the wavelength conversion composite component 10 , the first wavelength conversion component 11 and the second wavelength conversion component 12 are provided on the main surface 13 a of the substrate 13 so that the center of gravity of the first wavelength conversion component 11 and the second wavelength conversion component 12 as a whole is located on the rotation axis R of the substrate 13 .

[0061] As described above, the first phosphor included in the first wavelength conversion component 11 is a phosphor that radiates fluorescence due to parity forbidden transitions. Therefore, the first phosphor cannot effectively absorb the excitation light irradiated from the solid-state light-emitting element, and the first wavelength conversion component 11 needs to contain a large amount of the first phosphor. In contrast, the second phosphor included in the second wavelength conversion component 12 is a phosphor that radiates fluorescence due to parity allowed transitions. Therefore, the second phosphor can effectively absorb the excitation light irradiated from the solid-state light-emitting element, so the second wavelength conversion component 12 does not need to contain a large amount of the second phosphor. Therefore, the overall mass of the first wavelength conversion component 11 is greater than the overall mass of the second wavelength conversion component 12.

[0062] Therefore, in the wavelength conversion composite component 10, the first wavelength conversion component 11 and the second wavelength conversion component 12 are arranged so that the position of the center of gravity G of the first wavelength conversion component 11 and the second wavelength conversion component 12 as a whole exists on the rotation axis R of the substrate 13. Specifically, Figure 3 As shown, in the wavelength conversion composite component 10, the first wavelength conversion component 11 and the second wavelength conversion component 12 are respectively divided into two. Moreover, the first wavelength conversion component 11 and the second wavelength conversion component 12 are respectively in the shape of an arc with a central angle of about 90 degrees. Moreover, the first wavelength conversion component 11 and the second wavelength conversion component 12 are alternately arranged along the periphery of the substrate 13, and form a circular ring-shaped wavelength conversion component as a whole. That is, the two first wavelength conversion components 11 are arranged in a state of point symmetry with the rotation axis R as the center. Similarly, the two second wavelength conversion components 12 are arranged in a state of point symmetry with the rotation axis R as the center.

[0063] In this way, by dividing the first wavelength conversion member 11 and the second wavelength conversion member 12 into two and arranging them point-symmetrically, the position of the center of gravity G of the first wavelength conversion member 11 and the second wavelength conversion member 12 as a whole is located on the rotation axis R of the substrate 13. Therefore, when the wavelength conversion composite member 10 is rotated using a rotation drive device, the rotation of the wavelength conversion composite member 10 is not likely to become unstable, and can be rotated at a high speed.

[0064] As described above, since the transition probability of the first phosphor is low and the absorption rate of the excitation light is also low, the first wavelength conversion member 11 preferably contains a large amount of the first phosphor to increase the absorption rate. In contrast, since the transition probability of the second phosphor is high and the absorption rate of the excitation light is also high, the second wavelength conversion member 12 does not need to contain a large amount of the second phosphor like the first wavelength conversion member 11. Therefore, it is preferred that Figure 4As shown, the thickness of the first wavelength conversion member 11 is greater than the thickness of the second wavelength conversion member 12 in the direction perpendicular to the main surface 13a of the substrate 13. Thus, the thickness of the first wavelength conversion member 11 is increased, so that the absorption rate of the excitation light can be improved, and fluorescence can be radiated efficiently.

[0065] Furthermore, as described above, in the wavelength conversion composite component 10A, the first and second wavelength conversion components 11 and 12 are arranged so that the position of the center of gravity G of the entire first and second wavelength conversion components 11 and 12 exists on the rotation axis R of the substrate 13. Therefore, even when the thickness of the first wavelength conversion component 11 is made larger than that of the second wavelength conversion component 12, the wavelength conversion composite component 10A can be stably rotated.

[0066] The thickness T1 of the first wavelength conversion member 11 and the thickness T2 of the second wavelength conversion member 12 can be appropriately set according to the types of the first phosphor and the second phosphor, and the density of the phosphor in the wavelength conversion member. The thickness T1 of the first wavelength conversion member 11 can be set to 300 μm to 400 μm, for example. In addition, the thickness T2 of the second wavelength conversion member 12 can be set to 50 μm to 100 μm, for example.

[0067] Here, in Figure 5 , a wavelength conversion composite component 10a related to a comparative example is shown. In the wavelength conversion composite component 10a, the first wavelength conversion component 11 and the second wavelength conversion component 12 are each in the shape of an arc with a central angle of approximately 180 degrees. In addition, the thickness T1 of the first wavelength conversion component 11 is greater than the thickness T2 of the second wavelength conversion component 12. Therefore, the overall mass of the first wavelength conversion component 11 is greater than the overall mass of the second wavelength conversion component 12. Therefore, the position of the center of gravity G of the first wavelength conversion component 11 and the second wavelength conversion component 12 as a whole is biased toward the first wavelength conversion component 11 side relative to the rotation axis R. Therefore, when the wavelength conversion composite component 10a is rotated, the rotation becomes unstable due to the poor balance of the first wavelength conversion component 11 and the second wavelength conversion component 12. As a result, the rotation drive device connected to the wavelength conversion composite component 10a may fail.

[0068] In the wavelength conversion composite component of the present embodiment, the method of adjusting the position of the center of gravity G of the entire first wavelength conversion member 11 and the second wavelength conversion member 12 so that it exists on the rotation axis R is not limited to Figure 3 and Figure 4 For example, it is also preferred that Figure 6 As shown, in the wavelength conversion composite member 10B, when viewed along the rotation axis R of the substrate 13 , the area occupied by the second wavelength conversion member 12 is made larger than the area occupied by the first wavelength conversion member 11 .

[0069] As described above, the mass of the entire first wavelength conversion member 11 tends to be greater than the mass of the entire second wavelength conversion member 12. Therefore, by making the occupied area of ​​the second wavelength conversion member 12 larger than the occupied area of ​​the first wavelength conversion member 11, the position of the center of gravity G of the entire first and second wavelength conversion members 11 and 12 can be located on the rotation axis R.

[0070] As a method of adjusting the position of the center of gravity G of the first and second wavelength conversion members 11 and 12 as a whole so that it is located on the rotation axis R, the following method can be cited. Figure 7 The method shown. Figure 7 In the wavelength conversion composite component 10C, by setting a counterweight component 14 that does not include the first phosphor and the second phosphor near the second wavelength conversion component 12, the position of the center of gravity G of the first wavelength conversion component, the second wavelength conversion component and the counterweight component as a whole is made to exist on the rotation axis R of the substrate.

[0071] The weight member 14 is arc-shaped like the first and second wavelength converting members 11 and 12 and is provided along the second wavelength converting member 12 closer to the rotation axis R than the second wavelength converting member 12. The weight member 14 is fixed to the main surface 13a of the substrate 13.

[0072] By using such a weight component 14, the position of the center of gravity G of the first and second wavelength conversion components 11 and 12 as a whole can be placed on the rotation axis R, so that the wavelength conversion composite component 10C can be stably rotated. In addition, the weight component 14 can be any component as long as it is composed of a material that does not contain a fluorescent substance, for example, a component composed of an organic material or an inorganic material can be used. In addition, the weight component 14 can be a component composed of a material having light transmittance or a component composed of a material having light reflectivity.

[0073] In addition, in the wavelength conversion composite component 10C, both the second wavelength conversion component 12 and the weight component 14 are directly fixed on the main surface 13a of the substrate 13 and are adjacent to each other. However, the position of the weight component 14 is not limited to such a form, and for example, the second wavelength conversion component 12 and the weight component 14 may be stacked in a direction perpendicular to the main surface 13a of the substrate 13. In addition, there may be a gap between the second wavelength conversion component 12 and the weight component 14. Furthermore, the weight component 14 is not limited to an arc shape, and may be a rectangular or circular shape.

[0074] As a method of adjusting the position of the center of gravity G of the first and second wavelength conversion members 11 and 12 as a whole so that it exists on the rotation axis R, the following method can be cited. Figure 8 The method shown. Figure 8In the wavelength conversion composite components 10D and 10E, the first wavelength conversion component 11 and the second wavelength conversion component 12 are each divided into a plurality of parts. Furthermore, the first wavelength conversion component 11 and the second wavelength conversion component 12 are alternately arranged along the circumferential direction of the substrate 13.

[0075] Specifically, in Figure 8 In the wavelength conversion composite component 10D shown in (a), the first wavelength conversion component 11 and the second wavelength conversion component 12 are each divided into three. In addition, the first wavelength conversion component 11 and the second wavelength conversion component 12 are each in the shape of an arc with a central angle of about 60 degrees. The first wavelength conversion component 11 and the second wavelength conversion component 12 are alternately arranged along the periphery of the substrate 13, forming a circular ring-shaped wavelength conversion component as a whole.

[0076] exist Figure 8 In the wavelength conversion composite component 10E shown in (b), the first wavelength conversion component 11 and the second wavelength conversion component 12 are each divided into four. In addition, the first wavelength conversion component 11 and the second wavelength conversion component 12 are each in the shape of an arc with a central angle of about 45 degrees. The first wavelength conversion component 11 and the second wavelength conversion component 12 are alternately arranged along the periphery of the substrate 13, forming a circular ring-shaped wavelength conversion component as a whole.

[0077] Thus, in the wavelength conversion composite components 10D and 10E, the first wavelength conversion component 11 and the second wavelength conversion component 12 are respectively divided into a plurality of parts, which are arranged radially around the rotation axis R. In addition, the first wavelength conversion component 11 and the second wavelength conversion component 12 are alternately arranged along the circumferential direction of the substrate 13. Thus, the position of the center of gravity G of the entire first wavelength conversion component 11 and the second wavelength conversion component 12 can be located on the rotation axis R of the substrate 13.

[0078] In addition, the first wavelength conversion member 11 and the second wavelength conversion member 12 may be Figure 8 (a) can be divided into three parts, or Figure 8 (b) is divided into four parts. Figure 3 In that way, it can be divided into two, five or six parts respectively.

[0079] As mentioned above, in Figure 4 In the wavelength conversion composite component 10A shown, the thickness of the first wavelength conversion component 11 is greater than the thickness of the second wavelength conversion component 12 in the direction perpendicular to the main surface 13a of the substrate 13. With such a structure, the absorption efficiency of the excitation light by the first wavelength conversion component 11 is increased, so that fluorescence can be effectively radiated.

[0080] Here, in Fig. 9 , a light emitting device including a wavelength conversion composite component 10A and a solid light emitting element 20 emitting primary light L is shown. The light emitting device is configured to emit output light in a direction such that the primary light L emitted from the solid light emitting element 20 passes through a light-transmitting substrate 13 and a first wavelength conversion component 11 and a second wavelength conversion component 12.

[0081] Specifically, if Fig. 9 As shown in (a), the primary light L irradiated on the other main surface 13c (lower surface) of the substrate 13 passes through the substrate 13 and the first wavelength conversion member 11. When the primary light L passes through the first wavelength conversion member 11, the first phosphor contained in the first wavelength conversion member 11 absorbs at least a part of the primary light L and emits fluorescence. In addition, output light F1 containing fluorescence is emitted upward from the main light emission surface O1 at the upper end of the first wavelength conversion member 11. Then, the output light F1 emitted from the main light emission surface O1 passes through the lens 21 and is condensed.

[0082] Next, when the wavelength conversion composite component 10A rotates around the rotation axis R, Fig. 9 As shown in (b), the primary light L irradiated on the other main surface 13c of the substrate 13 passes through the substrate 13 and the second wavelength conversion member 12. When the primary light L passes through the second wavelength conversion member 12, the second phosphor contained in the second wavelength conversion member 12 absorbs at least a part of the primary light L and emits fluorescence. In addition, output light F2 and F3 containing fluorescence are emitted upward from the main light emission surface O2 at the upper end of the second wavelength conversion member 12. Then, the output light emitted from the main light emission surface O2 passes through the lens 21 and is condensed.

[0083] Here, in Fig. 9 In the light emitting device, the distance between the base material 13 of the wavelength conversion composite component 10A and the lens 21 is constant. In addition, in the wavelength conversion composite component 10A, the thickness T1 of the first wavelength conversion component 11 is configured to be larger than the thickness T2 of the second wavelength conversion component 12. Therefore, the distance from the main light exit surface O1 of the first wavelength conversion component 11 to the lens 21 is shorter than the distance from the main light exit surface O2 of the second wavelength conversion component 12 to the lens 21. That is, the main light exit surface O1 of the first wavelength conversion component 11 is closer to the lens 21 than the main light exit surface O2 of the second wavelength conversion component 12.

[0084] Therefore, if Fig. 9As shown in (a), most of the output light F1 emitted upward from the main light emitting surface O1 of the first wavelength conversion member 11 is taken in and condensed by the lens 21. In contrast, the output light F2 emitted upward from the main light emitting surface O2 of the second wavelength conversion member 12 is taken in and condensed by the lens 21, but the output light F3 is not taken in by the lens 21. Therefore, there is a possibility that the output light F3 is not condensed by the lens 21 and is not effectively used.

[0085] Therefore, it is preferable that the height from the main light exit surface O1 of the first wavelength conversion member 11 to the main surface 13a of the substrate 13 is the same as the height from the main light exit surface O2 of the second wavelength conversion member 12 to the main surface 13a of the substrate 13 in the direction perpendicular to the main surface 13a of the substrate 13. Specifically, Fig.10 As shown, it is preferable that the height H1 from the main light exit surface O1 of the first wavelength conversion member 11 to the main surface 13a of the substrate 13 is the same as the height H2 from the main light exit surface O2 of the second wavelength conversion member 12 to the main surface 13a of the substrate 13. Thus, the distance from the main light exit surface O1 of the first wavelength conversion member 11 to the lens 21 is the same as the distance from the main light exit surface O2 of the second wavelength conversion member 12 to the lens 21. Therefore, the output light F1 emitted from the main light exit surface O1 of the first wavelength conversion member 11 and the output lights F2 and F3 emitted from the main light exit surface O2 of the second wavelength conversion member 12 are both taken in and condensed by the lens 21. Therefore, the output light F1 and the output lights F2 and F3 can be effectively used.

[0086] The method of making the height H1 of the first wavelength conversion member 11 and the height H2 of the second wavelength conversion member 12 the same can be exemplified as follows: Fig.10 The method shown in the figure is to sandwich a height adjustment member 15 for adjusting the height between the main surface 13a of the substrate 13 and the second wavelength conversion member 12. As such a height adjustment member, a member having light transmittance similar to the substrate 13 can be used. In addition, when the substrate 13 is composed of a member having light reflectivity, the height adjustment member 15 can also be a member having light reflectivity.

[0087] Thus, the wavelength conversion composite components 10, 10A, 10B, 10C, 10D, 10E, and 10F of the present embodiment include a disk-shaped substrate 13, a first wavelength conversion component 11, and a second wavelength conversion component 12. The first wavelength conversion component 11 includes a first phosphor that emits fluorescence due to a parity-forbidden transition, and is disposed on the main surface 13a of the substrate 13. The second wavelength conversion component 12 includes a second phosphor that emits fluorescence due to a parity-allowed transition, and is disposed on the main surface 13a of the substrate 13. The first wavelength conversion component 11 and the second wavelength conversion component 12 are disposed adjacent to each other along the circumferential direction of the substrate 13. Furthermore, the first wavelength conversion component 11 and the second wavelength conversion component 12 are disposed on the main surface 13a of the substrate 13 in such a manner that the position of the center of gravity G of the first wavelength conversion component 11 and the second wavelength conversion component 12 as a whole is located on the rotation axis R of the substrate 13.

[0088] With such a structure, when the wavelength conversion composite components 10, 10A, 10B, 10C, 10D, 10E, and 10F are rotated using a rotation drive device, the rotation of the wavelength conversion composite components is not likely to become unstable, so the wavelength conversion composite components can be rotated smoothly and reliability can be improved. As a result, the first phosphor in the first wavelength conversion component 11 and the second phosphor in the second wavelength conversion component 12 can be efficiently excited to emit multiple types of fluorescence from the same circumference.

[0089] In addition, the first phosphor in the first wavelength conversion component 11 is a phosphor that radiates fluorescence caused by parity forbidden transitions. As such a phosphor, for example, a phosphor having the property of absorbing blue light or red light and converting it into a light component of deep red to near infrared can be cited. Furthermore, the second phosphor in the second wavelength conversion component 12 is a phosphor that radiates fluorescence caused by parity allowed transitions. As such a phosphor, for example, a phosphor having the property of absorbing blue light and converting it into a light component of green, yellow, red, etc. can be cited. Therefore, by using the wavelength conversion composite component of this embodiment, a light-emitting device that can radiate visible light such as white light and near infrared light can be obtained.

[0090] In the wavelength conversion composite component of the present embodiment, the method of adjusting the position of the center of gravity G of the entire first and second wavelength conversion members 11 and 12 so that the center of gravity G exists on the rotation axis R is not limited to Figures 3 to 10 In addition, it is also possible to Figures 3 to 10 The structures shown are arbitrarily combined so that the position of the center of gravity G of the entire first and second wavelength conversion members 11 and 12 is located on the rotation axis R.

[0091] [Light-emitting device]

[0092] Next, the light emitting device of the present embodiment is described. The light emitting device of the present embodiment includes the wavelength conversion composite components 10, 10A, 10B, 10C, 10D, 10E, and 10F described above. In addition, the light emitting device preferably further includes a solid light emitting element 20 that radiates light (primary light) toward the first wavelength conversion component 11 and the second wavelength conversion component 12. As such a solid light emitting element, an element that radiates primary light having an intensity maximum value in a range of wavelengths greater than 435nm and less than 560nm, preferably in a range of wavelengths greater than 440nm and less than 480nm, can be used.

[0093] Solid-state light-emitting elements may use, for example, light-emitting diodes (LEDs) or laser diodes. Furthermore, by using, for example, an LED module or laser diode that radiates high-energy light of more than 1 W, a light-emitting device that can expect a light output of several hundred mW can be achieved. In addition, by using an LED module that radiates high-energy light of more than 3 W or more than 10 W, a light-emitting device that can expect a light output of several W can be achieved. Furthermore, by using an LED module that radiates high-energy light of more than 30 W, a light-emitting device that can expect a light output of more than 10 W can be achieved. In addition, by using an LED module that radiates high-energy light of more than 100 W, a light-emitting device that can expect a light output of more than 30 W can be achieved.

[0094] If a laser diode is used as a solid-state light-emitting element and the primary light is set as laser, it becomes a specification to irradiate high-density point light to the first wavelength conversion component 11 and the second wavelength conversion component 12. Therefore, the obtained light-emitting device can be set as a high-output point light source, so the scope of industrial application of solid-state lighting can be expanded. As such a laser diode, for example, an edge emitting laser (EEL) or a vertical cavity surface emitting laser (VCSEL) can be used.

[0095] A light guide component such as an optical fiber may be sandwiched between the solid light emitting element and the wavelength conversion composite component. Thus, a structure in which the solid light emitting element and the wavelength conversion composite component are separated in space can be made. Therefore, the light emitting part can be moved lightly and freely, and as a result, a light emitting device can be made that can easily and freely change the irradiation location.

[0096] As described above, in the light emitting device, the solid light emitting element is preferably at least one of a light emitting diode and a laser diode. However, the solid light emitting element is not limited to these, and any light emitting element that can emit high-output primary light can be used.

[0097] In addition, the number of solid-state light emitting elements provided in the light emitting device is not particularly limited, and may be single or multiple. Multiple solid-state light emitting elements can easily increase the output of primary light, thus becoming a light emitting device that is advantageous for high output.

[0098] The number of solid-state light-emitting elements is not particularly limited, and can be appropriately selected from, for example, 9 or more, 16 or more, 25 or more, 36 or more, 49 or more, 64 or more, 81 or more, or 100 or more. In addition, the upper limit of the number is not particularly limited, and can be appropriately selected from, for example, 9 or less, 16 or less, 25 or less, 36 or less, 49 or less, 64 or less, 81 or less, or 100 or less.

[0099] In the light-emitting device, the solid light-emitting element is preferably a surface-emitting light source of the surface-emitting type. Thus, the deviation of the intensity distribution and the unevenness of the color tone of the primary light irradiating the first wavelength conversion component 11 and the second wavelength conversion component 12 are suppressed, so that it becomes a light-emitting device that is conducive to suppressing the uneven intensity distribution of the output light.

[0100] exist Fig.11 , an example of a light emitting device according to the present embodiment is shown. In the light emitting device 100, the primary light emitted by the solid light emitting element 20 is indirectly irradiated on the first wavelength conversion component 11 and the second wavelength conversion component 12 in the wavelength conversion composite component 10. Then, the light component after the wavelength conversion by the first wavelength conversion component 11 and the second wavelength conversion component 12 is output.

[0101] In the light emitting device 100, a plurality of solid-state light emitting elements 20 are provided. Then, the primary light emitted by the solid-state light emitting element 20 is reflected by the reflector 31, condensed by the first lens 32a, and then irradiated onto the first wavelength conversion member 11 and the second wavelength conversion member 12 formed on the main surface 13a of the substrate 13. Since the substrate 13 has light reflectivity, the fluorescence emitted by the first wavelength conversion member 11 and the second wavelength conversion member 12 is reflected in the direction opposite to the direction in which the primary light emitted by the solid-state light emitting element 20 is irradiated.

[0102] The light component reflected by the substrate 13 is condensed by the condenser lens 33. Then, the light component is repeatedly subjected to optical axis conversion and condensation by the first optical axis conversion mirror 34a, the second lens 32b, the second optical axis conversion mirror 34b, the third lens 32c, and the third optical axis conversion mirror 34c. And, the light component is incident on the emission lens 35 and emitted from the light emitting device 100.

[0103] Here, in the light emitting device 100, the wavelength conversion composite component 10 can be rotated using the rotation drive device 16. As described above, in the wavelength conversion composite component 10, the position of the center of gravity G of the entire first and second wavelength conversion components 11 and 12 is on the rotation axis R of the substrate 13, so the wavelength conversion composite component 10 can be stably rotated. Therefore, in the light emitting device 100, the first phosphor in the first wavelength conversion component 11 and the phosphor in the second wavelength conversion component 12 can be efficiently excited to emit fluorescence.

[0104] Next, regarding the light emitting device of this embodiment, a modified example for improving the performance will be described.

[0105] The light-emitting device of this embodiment can increase the absolute number of photons constituting the output light by making the solid-state light-emitting element 20 into a high-output type or increasing the number of solid-state light-emitting elements 20. As a result, the light energy of the output light emitted from the light-emitting device can exceed 3W, preferably exceed 10W, and more preferably exceed 30W. By making such a high-output light-emitting device, it is possible to illuminate with a stronger output light (such as near-infrared light), so even if the distance to the irradiated object is large, it is possible to irradiate relatively strong near-infrared rays. In addition, it also becomes a light-emitting device that can easily obtain information about the object even if the irradiated object is a tiny object or an object with thickness.

[0106] In addition, the light emitting device can also improve the photon density supplied to the phosphor by making the solid light emitting element 20 a light emitting element that emits primary light with high light density, such as a laser diode, or by focusing the light emitted by the solid light emitting element 20 with an optical lens. For example, the light energy density of the primary light emitted by the solid light emitting element 20 can be set to more than 0.3 W / mm 2 , preferably more than 1.0 W / mm 2 , more preferably more than 3.0W / mm 2 . In this case, since the light energy density of the primary light is large, it becomes a light-emitting device that radiates relatively strong output light even if a structure is set to irradiate the primary light after light diffusion to the first wavelength conversion component 11 and the second wavelength conversion component 12. In addition, if a structure is set to irradiate the primary light without light diffusion to the first wavelength conversion component 11 and the second wavelength conversion component 12, it becomes a light-emitting device that radiates output light with a large light energy density. Therefore, it is possible to provide a light-emitting device that can irradiate output light on a large area while using a light-emitting element with a small light emitting surface, and a light-emitting device that irradiates output light with a large light energy density. Furthermore, for example, it is also possible to provide a light-emitting device that can output near-infrared light with a large light energy density. In addition, the upper limit of the light energy density of the primary light emitted by the solid light-emitting element is not particularly limited, and for example, it can be set to 30 W / mm 2 .

[0107] Furthermore, by using the solid-state light emitting element 20 that radiates primary light of high light density, the first wavelength conversion member 11 and the second wavelength conversion member 12 can increase the energy density of the radiated light to more than 0.3 W / mm 2 , preferably more than 1.0W / mm 2 More preferably, it is more than 3.0 W / mm 2 .

[0108] In addition, by selecting an appropriate solid-state light emitting element, the intensity of the light component in the region with a wavelength shorter than 440nm in the output light can be adjusted to less than 3% of the maximum fluorescence intensity. In addition, the intensity of the light component in the region with a wavelength shorter than 440nm in the output light can be adjusted to less than 1% of the maximum fluorescence intensity. As a result, the intensity of the light component in the ultraviolet to blue wavelength region, to which photoresists are easily sensitive, is close to zero in the output light, so it becomes a light emitting device that emits near-infrared light that is useful for semiconductor-related inspection operations, such as use in yellow light rooms.

[0109] The light emitting device of this embodiment may further include a light distribution control mechanism for controlling light distribution characteristics. With such a structure, the light emitting device is advantageous in obtaining output light having a desired light distribution characteristic, such as a variable light distribution lighting system for a vehicle.

[0110] The light emitting device of this embodiment may also include a power input control device, for example, an output intensity variable mechanism for changing the intensity of near infrared rays. If such a structure is made, it becomes a light emitting device that is useful for inspecting foods or medicines that are easily damaged by near infrared irradiation.

[0111] The light emitting device of this embodiment may also be provided with a variable mechanism for changing the peak wavelength of the light component having the maximum fluorescence intensity within the range of wavelengths of 700 nm or more and less than 2500 nm. If such a structure is made, it becomes a light emitting device with great versatility and easy to cope with various uses. In addition, since the penetration depth of the light into the interior of the irradiated object changes according to the wavelength, it also becomes a light emitting device that is conducive to the inspection of the depth direction of the irradiated object, etc. In addition, as such a variable mechanism for the fluorescence peak wavelength, for example, an optical filter such as a bandpass filter or a low-frequency cutoff filter can be used.

[0112] The light emitting device of this embodiment may further include a light control mechanism for performing ON-OFF control on the output of at least a part of the wavelength components of the output light. This structure also makes the light emitting device highly versatile and easy to cope with various applications.

[0113] In addition, the light emitting device of the present embodiment can make the visible light component with a wavelength less than 700nm and the light component with a wavelength greater than 700nm in the output light into pulsed light. The half-value width of the irradiation time of the pulsed light can be set to less than 300ms. In addition, it can also be set that the greater the output intensity of the output light, the shorter the half-value width. Therefore, the half-value width can be set to less than 100ms, less than 30ms, less than 10ms, less than 3ms or less than 1ms to match the output intensity of the output light. In addition, the extinction time of the pulsed light can be set to be more than 1ms and less than 10s.

[0114] Here, it is reported that the human eye perceives light of 50 to 100 Hz (period 20 to 10 ms) as a flash. In addition, it is reported that birds such as pigeons perceive light of about 150 Hz (period 6.7 ms) as a flash, and insects such as flies perceive light of about 300 Hz (period 3.3 ms) as a flash. Therefore, an extinguishing time of less than 30 ms, which these organisms do not perceive as a flash, is a preferred form.

[0115] On the other hand, strong light irradiation has the risk of damaging the irradiated object, so in applications where flashing is not a concern, it is preferred that the extinction time of the pulse light is 100 ms or more, particularly 300 ms or more.

[0116] In addition, for the purpose of beauty care for regulating the growth of human hair or body hair, the light energy of the output light is preferably 0.01 J / cm 2 Above and less than 1J / cm 2 Therefore, if the light energy of the output light emitted from the light emitting device is set to this range and the output light is irradiated near the hair root, the melanin etc. existing inside the skin can absorb the light, and as a result, the growth of hair etc. can be regulated.

[0117] Here, the preferred 1 / 10 afterglow time of the output light, that is, the time until the light intensity drops to 1 / 10 just before extinguishing, is preferably less than 100 μs, more preferably less than 10 μs, and particularly preferably less than 1 μs. Thus, a light emitting device that can be instantly lit or extinguished can be obtained.

[0118] The light emitting device of this embodiment may also be provided with an ultraviolet light source that radiates ultraviolet light having a maximum intensity within a wavelength range of 120 nm to less than 380 nm, preferably 250 nm to less than 370 nm, so as to simultaneously provide a light emitting device having a sterilization effect based on ultraviolet light.

[0119] The light-emitting device of the present embodiment is preferably a medical light-emitting device. That is, the light-emitting device of the present embodiment that can emit near-infrared light components can be used as a light source or lighting device for medical or biotechnological use. In particular, the light-emitting device of the present embodiment can be used as a medical light-emitting device used in fluorescence imaging or photodynamic therapy, or as a biotechnological light-emitting device used in the inspection and analysis of cells, genes, specimens, etc. Since the near-infrared light component has the property of penetrating organisms, cells, etc., such a light-emitting device can be used to observe and treat the affected part from inside and outside the body, or can be used in biotechnology.

[0120] In addition, the light emitting device of this embodiment that can emit near-infrared light components can also be used as a light source for a sensing system or a lighting system for a sensing system. In this way, for example, the content or foreign matter in an organic bag or container can be inspected in an unopened state by using near-infrared light components that have the property of transmitting organic matter and near-infrared light components that are reflected by objects. In addition, such a light emitting device can be used to monitor animals, plants, and objects including humans.

[0121] [Electronic equipment]

[0122] Next, an electronic device according to this embodiment is described. The electronic device according to this embodiment includes the above-mentioned light emitting device. Fig.12 An example of an electronic device according to the present embodiment is schematically shown in FIG. The electronic device 200 includes at least a power supply circuit 41, a conductor 42, and a light emitting device 100 including a wavelength conversion composite component, a rotation drive device, and a solid-state light emitting element.

[0123] The power supply circuit 41 supplies electric power to the rotation drive device and the solid light emitting element of the light emitting device. In addition, the power supply circuit 41 supplies electric energy to the rotation drive device and the solid light emitting element via the conductor 42.

[0124] As described above, the light emitting device 100 is a device that converts electrical energy into optical energy. The light emitting device 100 converts at least a portion of the electrical energy supplied from the power supply circuit 41 into optical energy as the output light 43 and outputs the optical energy. Fig.12 The light emitting device 100 is configured to emit output light 43 including near-infrared light.

[0125] Fig.12The electronic device 200 further includes a first detector 47A and a second detector 47B. The first detector 47A detects a transmitted light component 45 of the output light 43 emitted from the light emitting device 100 and irradiated on the irradiated object 44. Specifically, the first detector 47A detects near-infrared light in the transmitted light component 45 that has transmitted the irradiated object 44. The second detector 47B detects a reflected light component 46 in the output light 43 emitted from the light emitting device 100 and irradiated on the irradiated object 44. Specifically, the second detector 47B detects near-infrared light in the reflected light component 46 that has been reflected by the irradiated object 44.

[0126] In the electronic device 200 of such a structure, the output light 43 including the near-infrared light component is irradiated to the irradiated object 44, and the first detector 47A and the second detector 47B detect the transmitted light component 45 that has passed through the irradiated object 44 and the reflected light component 46 that has been reflected by the irradiated object 44. Therefore, the electronic device 200 can detect characteristic information of the irradiated object 44 that is affected by the near-infrared light component.

[0127] Here, the light emitting device of this embodiment can emit output light 43 including visible light and near infrared light and suitable for human eyes and detectors. Therefore, by combining the light emitting device with a near infrared detector, an electronic device suitable for industrial use is obtained.

[0128] In addition, the light emitting device of this embodiment can be configured to have a large energy of the output light 43 and illuminate a wide range. Therefore, even if the output light 43 is irradiated to the irradiated object 44 from a far distance, a signal with a good S / N ratio (signal / noise ratio) can be detected. Therefore, it becomes an electronic device suitable for inspection of a large irradiated object 44, inspection of objects distributed in a large area, detection of objects existing in a part of an inspection area covering a large area, detection of a person or object from a distance, etc.

[0129] For reference, the dimensions of the light emitting device of this embodiment are as follows. For example, the area of ​​the main light extraction surface of the light emitting device 100 can be set to 1 cm 2 More than and less than 1m 2 , preferably 10cm 2 Above and less than 1000cm 2. In addition, the shortest distance from the light emitting device 100 to the irradiated object 44 is, for example, greater than 1 mm and less than 10 m. In the case where it is necessary to irradiate the irradiated object 44 with strong near-infrared rays, such as in the case of medical treatment, beauty, and inspection of delicate foreign bodies, the shortest distance from the light emitting device 100 to the irradiated object 44 can be, for example, greater than 1 mm and less than 30 cm, preferably greater than 3 mm and less than 10 cm. Furthermore, in the case where it is necessary to inspect a wide range of the irradiated object 44, the shortest distance from the light emitting device 100 to the irradiated object 44 can be set to greater than 30 cm and less than 10 m, preferably greater than 1 m and less than 5 m.

[0130] In addition, when it is necessary to irradiate strong near-infrared rays over a wide range, it is preferable to make the light emitting device 100 movable, and more preferably to make it freely movable according to the shape of the irradiated object. For example, the light emitting device 100 can be made into a structure that can reciprocate on a straight line or a curve, a structure that can scan in the XY axis direction or the XYZ direction, or a structure that can be installed on a moving object (a flying object such as a car, a bicycle, or a drone).

[0131] Various photodetectors can be used as the first detector 47A and the second detector 47B. Specifically, a quantum photodetector (photodiode, phototransistor, photoIC, CCD image sensor, CMOS image sensor, etc.) that detects the charge generated when light is incident on the PN junction of a semiconductor can be used according to the usage form of the electronic device. In addition, as the photodetector, a thermal photodetector (thermoelectric pile using thermoelectric effect, pyroelectric element using pyroelectric effect, etc.) that detects the change of electrical properties caused by the temperature rise caused by the heat generated when receiving light or an infrared film that is sensitive to light can also be used.

[0132] As the first detector 47A and the second detector 47B, either a single element using a photoelectric conversion element as a single body or an imaging element integrating the photoelectric conversion element can be used. The imaging element can be in a linear form arranged one-dimensionally or in a planar form arranged two-dimensionally. A camera can also be used as the first detector 47A and the second detector 47B.

[0133] in addition, Fig.12 The electronic device 200 includes both the first detector 47A and the second detector 47B, but the electronic device only needs to include at least one of the first detector 47A and the second detector 47B.

[0134] In addition, the electronic device of this embodiment can use the output light as an inspection device, detection device, monitoring device or classification device for the irradiated object. The near-infrared light component of the output light has the property of transmitting almost all substances. Therefore, by making a structure that irradiates the substance with near-infrared light from the outside and detects the transmitted light or reflected light, it is possible to inspect the internal state, the presence of foreign matter, etc. without destroying the substance.

[0135] In addition, near-infrared light components are invisible to the human eye, and their reflection characteristics depend on the material. Therefore, by making a structure that irradiates near-infrared light to an object and detects its reflected light, it is possible to detect people, animals, plants, objects, etc. in dark places without making them noticeable.

[0136] Furthermore, the electronic device of this embodiment can check the internal state and the presence of foreign matter without destroying the material, determine whether the material is qualified, and distinguish qualified products from unqualified products. Therefore, the electronic device can distinguish objects by also having a mechanism for distinguishing between irradiated objects in normal state and irradiated objects in abnormal state.

[0137] In the electronic device of this embodiment, the light emitting device 100 may be fixed instead of movable. In this way, there is no need to have a complex mechanism for mechanically moving the light emitting device, so it becomes an electronic device that is not prone to failure. In addition, by fixing the light emitting device indoors or outdoors, it is possible to observe the state of people and objects in a pre-set place at a fixed point, or count the number of people and objects. Therefore, it becomes an electronic device that is conducive to collecting big data that is useful for problem discovery or commercial utilization.

[0138] The electronic device of this embodiment can also make the light emitting device 100 movable to change the place to be illuminated. For example, the light emitting device 100 can be mounted on a mobile station or a mobile object (a vehicle, an aircraft, etc.) to make it movable. In this way, the light emitting device 100 can illuminate a desired place or a wide range, so it becomes an electronic device that is useful for inspecting large objects and inspecting the state of outdoor objects.

[0139] The electronic device of this embodiment can be configured to include a hyperspectral camera as a camera in addition to the light emitting device. Thus, the electronic device performs hyperspectral imaging. The electronic device including the hyperspectral camera can distinguish differences that cannot be distinguished by the naked eye or a conventional camera as images, and thus becomes a useful inspection device in a wide range of fields involving product inspection and identification.

[0140] Specifically, if Fig.13As shown, the electronic device 200A includes a light emitting device 100 and a hyperspectral camera 51. While the light emitting device 100 emits output light to an irradiated object 53 placed on a surface 52a of a conveyor 52, the hyperspectral camera 51 photographs the irradiated object 53. By analyzing the obtained image of the irradiated object 53, the irradiated object 53 can be inspected and identified.

[0141] The electronic device of this embodiment is preferably equipped with a data processing system for machine learning in addition to the light emitting device. Thus, the data input into the computer can be repeatedly learned to find the pattern hidden therein. In addition, the newly input data can be applied to the pattern. Therefore, it becomes an electronic device that is conducive to the automation or high precision of inspection, detection, monitoring, etc., and further conducive to the future prediction using big data.

[0142] The electronic device of this embodiment can also be used for medical purposes, animal medicine, biotechnology, agriculture, forestry and fishery, animal husbandry (edible meat, meat products, dairy products, etc.), and industrial purposes (foreign matter inspection, content inspection, shape inspection, packaging status inspection, etc.). In addition, the electronic device can also be used for the inspection of pharmaceuticals, animal experiments, food, beverages, agricultural and forestry products, livestock products, and industrial products. In other words, the electronic device of this embodiment can be used for any of the human body, animals, plants, and objects, and can also be used for any of gases, liquids, and solids.

[0143] The electronic device of the present embodiment is preferably used as a medical device, a therapeutic device, a beauty device, a health device, a care-related device, an analysis device, a measurement device, or an evaluation device.

[0144] For example, for the purpose of medical and biotechnology development, the electronic device of this embodiment can be used for: 1) blood, body fluids and their components; 2) excreta (urine, feces); 3) proteins, amino acids; 4) cells (including cancer cells); 5) genes, chromosomes, nucleic acids; 6) biological samples, bacteria, specimens, antibodies; 7) biological tissues, organs, blood vessels; 8) inspection, detection, measurement, evaluation, analysis, resolution, observation, monitoring, separation, diagnosis, treatment, purification, etc. of skin diseases and alopecia.

[0145] In addition, for example, for the purpose of beauty and health management, the electronic device of this embodiment can be used for: 1) skin; 2) hair, body hair, 3) inside the mouth, inside the teeth, and periodontal; 4) ears, nose; 5) inspection, detection, measurement, evaluation, analysis, interpretation, observation, monitoring, beautification, hygiene, development promotion, health improvement, diagnosis, etc. of vital signs.

[0146] For example, for the purposes of agriculture, forestry, fishery, animal husbandry, and industry, the electronic device of this embodiment can be used for: 1) industrial products (including electronic components, electronic equipment); 2) agricultural products (vegetables, fruits, etc.); 3) enzymes, bacteria; 4) marine products (fish, shellfish, crustaceans, mollusks); 5) pharmaceuticals, biological samples; 6) food, beverages; 7) the existence and state of humans, animals, and objects; 8) the state of gases (including water vapor); 9) liquids, fluids, water, moisture, humidity; 10) the shape, color, internal structure, and physical state of objects; 11) space, position, and distance; 12) the pollution state of objects; 13) the state of molecules and particles; 14) inspection, detection, measurement, metering, evaluation, analysis, analysis, observation, monitoring, identification, discrimination, and differentiation of industrial waste.

[0147] For example, for the purpose of nursing care, the electronic device of this embodiment can be used for excretion confirmation, identification, management, and monitoring of health status, and the like.

[0148] As described above, the electronic device of this embodiment can cope with all uses such as inspection, detection, measurement, measurement, evaluation, analysis, analysis, observation, monitoring, recognition, identification, and distinction.

[0149] As mentioned above, although this embodiment was described, this embodiment is not limited to these, Various deformation|transformation is possible within the range of the summary of this embodiment.

[0150] The entire contents of Tokugan Applicant No. 2020-076772 (filing date: April 23, 2020) are incorporated herein by reference.

[0151] Industrial Applicability

[0152] According to the present invention, it is possible to provide a wavelength conversion composite component capable of smoothly rotating a substrate including a wavelength conversion component to improve reliability, and a light emitting device and an electronic device using the wavelength conversion composite component.

[0153] Description of symbols

[0154] 10, 10A, 10B, 10C, 10D, 10E, 10F Wavelength conversion composite components

[0155] 11. First wavelength conversion component

[0156] 12. Second wavelength conversion component

[0157] 13. Substrate

[0158] 13a Main side

[0159] 14. Counterweight

[0160] 20 Solid-state light-emitting devices

[0161] 100 Lighting Device

[0162] 200, 200A Electronic equipment

Claims

1. A wavelength conversion composite component, wherein: have: Disc-shaped substrate; A first wavelength conversion component, comprising a first phosphor that emits fluorescence due to parity forbidden transition, is disposed on the substrate; and The second wavelength conversion component includes a second phosphor that emits fluorescence due to parity-allowed transition and is disposed on the substrate; The first wavelength conversion member and the second wavelength conversion member are arranged adjacent to each other along the circumferential direction of the substrate; The first wavelength conversion member and the second wavelength conversion member are provided on the substrate such that the center of gravity of the first wavelength conversion member and the second wavelength conversion member as a whole is located on the rotation axis of the substrate.

2. The wavelength conversion composite component according to claim 1, wherein: In a direction perpendicular to the main surface of the substrate, a thickness of the first wavelength conversion member is greater than a thickness of the second wavelength conversion member.

3. The wavelength conversion composite component according to claim 1 or 2, wherein: When viewed along the rotation axis of the substrate, an area occupied by the second wavelength conversion member is larger than an area occupied by the first wavelength conversion member.

4. The wavelength conversion composite component according to claim 1 or 2, wherein: The first wavelength conversion component and the second wavelength conversion component are respectively divided into a plurality of parts; The first wavelength conversion members and the second wavelength conversion members are alternately arranged along a circumferential direction of the substrate.

5. The wavelength conversion composite component according to claim 1 or 2, wherein: In a direction perpendicular to the principal surface of the substrate, a height from the principal light exit surface of the first wavelength conversion member to the principal surface of the substrate is the same as a height from the principal light exit surface of the second wavelength conversion member to the principal surface of the substrate.

6. The wavelength conversion composite component according to claim 1 or 2, wherein: The above-mentioned substrate has light reflectivity.

7. The wavelength conversion composite component according to claim 1 or 2, wherein: The substrate is light-transmissive.

8. A light emitting device, wherein: A wavelength conversion composite component according to any one of claims 1 to 7.

9. The light emitting device according to claim 8, wherein: The invention further includes a solid-state light emitting element that radiates light to be irradiated toward the first wavelength conversion member and the second wavelength conversion member.

10. The light emitting device according to claim 8 or 9, wherein: The above-mentioned light-emitting device is a medical light-emitting device.

11. An electronic device, wherein: A light emitting device according to any one of claims 8 to 10.

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