JP2019062173A - Luminaire apparatus and light-emitting device - Google Patents

Abstract

To provide a luminaire apparatus capable of improving color reproducibility.SOLUTION: The luminaire apparatus comprises: an LED chip that emits primary light; and phosphor particles that emit secondary light when excited by the primary light. A luminaire apparatus 100 emits outgoing beam which includes primary light and secondary light. Emission spectrum of the outgoing beam includes: a first peak which positions in a range of 420-460 nm in wavelength; a second peak which positions in a range of 530-580 nm in wavelength; a third peak which positions in a range of 605-655 nm in wavelength; a first bottom which positions in a range of 440-480 nm in wavelength; and a second bottom which positions in a range of 555-605 nm in wavelength.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a lighting device.

  Conventionally, a light emitting device is known which emits light of a color different from that of the LED chip by a combination of a light emitting element such as a LED (Light Emitting Diode) chip and phosphor particles which are excited by the light emitted from the LED chip to emit light. ing. As an example of such a light emitting device, Patent Document 1 discloses a light emitting device that can increase the light emission efficiency and is unlikely to cause a decrease in luminance due to a temperature rise.

JP 2011-134934 A

  White light emitted from a lighting device using a light emitting element such as an LED has a bias in the light intensity of the light emission spectrum, and thus the color reproducibility is lower than that of natural light. That is, in such a lighting device, it is an object to improve color reproducibility.

  The present invention provides a lighting device with improved color reproducibility.

  An illumination device according to an aspect of the present invention includes a light emitting element that emits primary light, and light emitting particles that are excited by the primary light to emit secondary light, and the emitted light includes the primary light and the secondary light. The emission spectrum of the emitted light is located in a first peak located in the wavelength range of 420 nm to 460 nm, a second peak located in the wavelength range of 530 nm to 580 nm, and a wavelength range of 605 nm to 655 nm It has a third peak, a first bottom located in the wavelength range of 440 nm to 480 nm, and a second bottom located in the wavelength range of 555 nm to 605 nm.

  A light emitting device according to an aspect of the present invention includes a light emitting element that emits primary light, and light emitting particles that are excited by the primary light to emit secondary light, and the emitted light includes the primary light and the secondary light The emission spectrum of the emitted light is located in a first peak located in the wavelength range of 420 nm to 460 nm, a second peak located in the wavelength range of 530 nm to 580 nm, and a wavelength range of 605 nm to 655 nm It has a third peak, a first bottom located in the wavelength range of 440 nm to 480 nm, and a second bottom located in the wavelength range of 555 nm to 605 nm.

  According to the present invention, a lighting device with improved color reproducibility is realized.

FIG. 1 is an external perspective view of a lighting device and its peripheral members according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of the illumination device according to the first embodiment. FIG. 3 is a view showing the relationship between color rendering index Ri and a plurality of examples of the illumination device according to the first embodiment. FIG. 4 is a view showing the relationship between a plurality of examples of the illumination device according to Embodiment 1 and the characteristics of the quantum dot phosphor used in each of the plurality of examples. FIG. 5 is a diagram showing an emission spectrum of the illumination device according to Comparative Example 1. FIG. 6 is a diagram showing an emission spectrum of the illumination device according to Comparative Example 2. FIG. 7 is a diagram showing an emission spectrum of the illumination device according to Comparative Example 3. FIG. 8 is a diagram showing an emission spectrum of the illumination device according to Comparative Example 4. FIG. 9 is a view showing an emission spectrum of the illumination device according to Comparative Example 5. FIG. 10 is a diagram showing an emission spectrum of the illumination device according to Comparative Example 6. FIG. 11 is a diagram showing an emission spectrum of the illumination device according to the first embodiment. FIG. 12 is a diagram showing an emission spectrum of the illumination device according to the second embodiment. FIG. 13 is a diagram showing an emission spectrum of the illumination device according to the third embodiment. FIG. 14 is a diagram showing an emission spectrum of the illumination device according to the fourth embodiment. FIG. 15 is a diagram showing an emission spectrum of the illumination device according to the fifth embodiment. FIG. 16 is a diagram showing an emission spectrum of the illumination device according to the sixth embodiment. FIG. 17 is a diagram showing an emission spectrum of the illumination device according to the seventh embodiment. FIG. 18 is a diagram showing a light emission spectrum of the lighting device according to the eighth embodiment. FIG. 19 is a diagram showing the ratio of the light intensity of the second peak, the third peak, the first bottom, and the second bottom to the light intensity of the first peak. FIG. 20 is a graph in which the color temperature and the ratio of the light intensity of the second peak to the first peak are plotted. FIG. 21 is a graph in which the color temperature and the ratio of the light intensity of the third peak to the first peak are plotted. FIG. 22 is a graph plotting color temperature and the ratio of the light intensity of the first bottom to the first peak. FIG. 23 is a graph plotting color temperature and the ratio of the light intensity of the second bottom to the first peak. FIG. 24 is a diagram showing the color temperature standard defined by the ANSI (American National Standards Institute). FIG. 25 is an external perspective view of the light emitting device according to the second embodiment. FIG. 26 is a schematic cross-sectional view of the light emitting device according to the second embodiment. FIG. 27 is a schematic cross-sectional view of a light emitting device according to a first modification of the second embodiment. FIG. 28 is a schematic cross-sectional view of a light emitting device according to a second modification of the second embodiment. 29 is a schematic cross-sectional view of a light emitting device according to Variation 3 of Embodiment 2. FIG. FIG. 30 is a schematic cross-sectional view of a light emitting device according to a fourth modification of the second embodiment. FIG. 31 is a schematic cross-sectional view of a light emitting device according to a fifth modification of the second embodiment.

  Embodiments will be described below with reference to the drawings. The embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, and the like described in the following embodiments are merely examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, components not described in the independent claim indicating the highest concept are described as arbitrary components.

  Each figure is a schematic view, and is not necessarily illustrated strictly. Further, in the drawings, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

Embodiment 1
[Whole structure of lighting device]
Hereinafter, the configuration of the lighting apparatus according to Embodiment 1 will be described with reference to the drawings. FIG. 1 is an external perspective view of a lighting device according to the embodiment. FIG. 2 is a cross-sectional view of the illumination device according to the first embodiment.

  As illustrated in FIG. 1 and FIG. 2, the lighting device 100 according to the first embodiment, for example, irradiates light to a space (such as a hallway or a wall) below by being buried in a ceiling of a house or the like. Downlight.

  The lighting device 100 includes a light emitting device 30. In addition, the lighting device 100 has a substantially bottomed cylindrical device body configured by coupling the base 110 and the frame portion 120, the reflection plate 130, the lighting device 150, the terminal block 160, the mounting plate 170, and , The top plate 180 is provided. The light emitting device 30 includes the light emitting unit 10 and the phosphor plate 20.

[Light-emitting device: Light-emitting unit]
The light emitting unit 10 is an LED module having a chip on board (COB) structure in which a plurality of LED chips 12 are directly mounted on the substrate 11 and emits blue light.

  The substrate 11 is a substrate having a wiring area provided with a wiring. The wiring is a wiring for supplying power to the LED chip 12 and is formed of a metal material. In addition, an electrode for electrically connecting the light emitting unit 10 and an external device is provided on the substrate 11 as a part of the wiring. The substrate 11 is, for example, a metal base substrate or a ceramic substrate. The substrate 11 may be a resin substrate having a resin as a base material.

  As the ceramic substrate, an alumina substrate made of aluminum oxide (alumina), an aluminum nitride substrate made of aluminum nitride, or the like is employed. Further, as the metal base substrate, for example, an aluminum alloy substrate, an iron alloy substrate, a copper alloy substrate or the like in which an insulating film is formed on the surface is adopted. As the resin substrate, for example, a glass epoxy substrate made of glass fiber and epoxy resin is adopted.

  In addition, as the substrate 11, for example, a substrate having a high light reflectance (for example, a light reflectance of 90% or more) may be employed. By employing a substrate having a high light reflectance as the substrate 11, light emitted from the LED chip can be reflected on the surface of the substrate 11. As a result, the light extraction efficiency of the light emitting unit 10 is improved. As such a substrate, for example, a white ceramic substrate based on alumina is exemplified.

  In addition, a translucent substrate having a high light transmittance may be adopted as the substrate 11. As such a substrate, a translucent ceramic substrate made of polycrystalline alumina or aluminum nitride, a transparent glass substrate made of glass, a quartz substrate made of quartz, a sapphire substrate made of sapphire or a transparent resin substrate made of a transparent resin material It is illustrated. In addition, although the planar view shape of the board | substrate 11 is a rectangle, for example, other shapes, such as circular, may be sufficient.

  The LED chip 12 is an example of a light emitting element, and is disposed (mounted) on the substrate 11. The LED chip 12 is, for example, a blue LED chip having a central wavelength (peak wavelength of emission spectrum) of 420 nm or more and 460 nm or less, which is made of a gallium nitride-based material such as InGaN. That is, the LED chip 12 emits blue light. In the first embodiment, the LED chip 12 emits blue light having an emission peak wavelength of about 442 nm.

  Although a plurality of LED chips 12 are disposed on the substrate 11, at least one LED chip 12 may be disposed. The plurality of LED chips 12 may be disposed on the substrate 11 in any manner. Also, the plurality of LED chips 12 may be electrically connected in any manner.

[Light-emitting device: Phosphor plate]
The phosphor plate 20 is an example of a fluorescent member, and is disposed to face the light emitting unit 10. The phosphor plate 20 is disposed such that the main surface of the phosphor plate 20 is orthogonal to the optical axis of the light emitting unit 10. The phosphor plate 20 is disposed on the light emitting side of the light emitting unit 10 so as to be separated from the light emitting unit 10. That is, the phosphor plate 20 is irradiated with the blue light emitted by the light emitting unit 10. The phosphor plate 20 is an example of a wavelength conversion material, and includes a base 21 and phosphor particles 22.

  The base 21 is formed of, for example, a light transmitting resin material such as an acrylic resin or a polycarbonate resin, but may be formed of a light transmitting ceramic material or the like. When the substrate 21 is a resin material, the phosphor particles 22 are mixed with the resin material, for example, at the time of molding. When the substrate 21 is a ceramic material, the phosphor particles 22 are spin-coated on the surface of the substrate 21, for example. The thickness of the phosphor plate 20 is, for example, 1 mm or less, but may be 100 μm or less.

  In addition, the phosphor plate 20 may have a laminated structure in which a phosphor layer including the phosphor particles 22 is sandwiched by glass materials.

The phosphor particles 22 are an example of light emitting particles, and are excited by primary light (that is, blue light) emitted by the LED chip 12 included in the light emitting unit 10 to emit secondary light having a wavelength longer than that of the primary light. The phosphor particles 22 are, for example, quantum dot phosphors containing a semiconductor material. The quantum dot phosphor is specifically a quantum dot phosphor represented by a chemical formula of CdS _x Se _1-x / ZnS, but may be a cadmium free quantum dot phosphor. The quantum dot phosphor can emit light of various emission peak wavelengths by changing at least one of the composition and the shape.

  When the light emitting unit 10 emits primary light (that is, blue light), part of the emitted primary light is wavelength-converted to secondary light by the phosphor particles 22 included in the phosphor plate 20. As a result, the lighting device 100 emits outgoing light including primary light which is not absorbed by the phosphor particles 22 and secondary light whose wavelength is converted by the phosphor particles 22. Specifically, the emitted light is white light.

[Base, body, reflector]
The base 110 is a mount on which the light emitting unit 10 is attached, and is a heat sink that dissipates heat generated by the light emitting unit 10. The base 110 is formed in a substantially cylindrical shape using a metal material, and is made of aluminum die-cast in the first embodiment.

  On the upper portion (ceiling side portion) of the base 110, a plurality of heat dissipating fins 111 projecting upward are provided at a predetermined distance from each other along one direction. Thus, the heat generated by the light emitting unit 10 can be efficiently dissipated.

  The frame portion 120 has a substantially cylindrical cone portion 121 having a reflective surface on the inner surface, and a frame body main portion 122 to which the cone portion 121 is attached. The cone portion 121 is formed using a metal material, and can be produced, for example, by drawing or press forming an aluminum alloy or the like. The frame body portion 122 is formed of a hard resin material or a metal material. The frame body portion 120 is fixed by attaching the frame body main portion 122 to the base 110.

  The reflecting plate 130 is a ring-shaped (funnel-shaped) reflecting member having an inner surface reflecting function. The reflecting plate 130 can be formed using, for example, a metal material such as aluminum. The reflecting plate 130 may be formed of a hard white resin material instead of a metal material.

[Lighting device, terminal block, mounting plate, top plate]
In addition, as shown in FIG. 1, the lighting device 100 relays to the lighting device 150 the lighting device 150 that supplies power for lighting the light emitting unit 10 to the light emitting unit 10 and the AC power from the commercial power supply. And a terminal block 160. Specifically, lighting device 150 converts AC power relayed from terminal block 160 into DC power and outputs the DC power to light emitting unit 10.

  The lighting device 150 and the terminal block 160 are fixed to a mounting plate 170 provided separately from the device body. The mounting plate 170 is formed by bending a rectangular plate member made of a metal material, and the lighting device 150 is fixed to the lower surface of one end in the longitudinal direction, and the terminal block 160 is fixed to the lower surface of the other end. It is fixed. The mounting plate 170 is connected to a top plate 180 fixed to the upper portion of the base 110 of the tool body.

[Specific configuration of phosphor plate provided in lighting device]
The inventors of the present invention have realized a lighting device 100 in which all the color rendering index numbers R1 to R15 of 15 have high values by including a plurality of types of quantum dot phosphors having different emission peak wavelengths in the phosphor plate 20. FIG. 3 is a diagram showing the relationship between the color rendering index Ri (i is an integer of 1 or more and 15 or less) with a plurality of embodiments of the lighting device 100. FIG. 4 is a diagram showing the relationship between a plurality of embodiments of the illumination device 100 and the characteristics of the quantum dot phosphors used in each of the plurality of embodiments. 3 and 4, in addition to the first to eighth embodiments in which the color rendering index R1 to R15 all have high values, a comparative example obtained by the study of the inventors is also illustrated. In FIG. 3, cells in which the color rendering index is less than 90 are hatched, and cells in which hatching is not performed have a color rendering index of 90 or more.

Comparative Examples 1 to 6
First, illumination devices 100 according to comparative examples 1 to 6 will be described. In the illumination device 100 according to Comparative Example 1, the phosphor plate 20 includes two types of quantum dot phosphors: a quantum dot phosphor having an emission peak wavelength of 555 nm and a quantum dot phosphor having an emission peak wavelength of 630 nm. included.

  The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 45 nm and an intensity ratio of 46. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 45 nm and an intensity ratio of 28. Here, the intensity ratio means relative light intensity, and in the illumination device 100 according to Comparative Example 1, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half width of the light intensity. Is 20 and the intensity ratio is 26. FIG. 5 is a diagram showing an emission spectrum of the illumination device 100 according to Comparative Example 1. As shown in FIG. The color temperature of the emitted light of the illuminating device 100 which concerns on the comparative example 1 is 4981.3 K, and Duv is 0.5.

  In the illumination device 100 according to Comparative Example 2, the phosphor plate 20 includes a quantum dot phosphor having an emission peak wavelength of 480 nm, a quantum dot phosphor having an emission peak wavelength of 555 nm, and a quantum dot having an emission peak wavelength of 630 nm. Three types of quantum dot phosphors are included.

  The quantum dot phosphor having an emission peak wavelength of 480 nm has a half-width of light intensity of 45 nm and an intensity ratio of 28. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 45 nm and an intensity ratio of 62. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 45 nm and an intensity ratio of 51. In the illumination device 100 according to Comparative Example 2, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 25. FIG. 6 is a view showing an emission spectrum of the illumination device 100 according to the comparative example 2. As shown in FIG. The color temperature of the emitted light of the illuminating device 100 which concerns on the comparative example 2 is 4987.9 K, and Duv is -0.3.

  In the illumination device 100 according to Comparative Example 3, the phosphor plate 20 includes a quantum dot phosphor having an emission peak wavelength of 480 nm, a quantum dot phosphor having an emission peak wavelength of 505 nm, and a quantum dot phosphor having an emission peak wavelength of 555 nm. And four types of quantum dot phosphors, which have a light emission peak wavelength of 630 nm.

  The quantum dot phosphor having an emission peak wavelength of 480 nm has a half-width of light intensity of 45 nm and an intensity ratio of 32. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 45 nm and an intensity ratio of 62. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 45 nm and an intensity ratio of 73. In the illumination device 100 according to Comparative Example 3, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 27. FIG. 7 is a diagram showing an emission spectrum of the illumination device 100 according to Comparative Example 3. As shown in FIG. The color temperature of the emitted light of the illuminating device 100 which concerns on the comparative example 3 is 4953.3K, and Duv is -0.6.

  In the illumination device 100 according to Comparative Example 4, the phosphor plate 20 includes a quantum dot phosphor having an emission peak wavelength of 480 nm, a quantum dot phosphor having an emission peak wavelength of 505 nm, and a quantum dot phosphor having an emission peak wavelength of 530 nm. 5 types of quantum dot fluorescent substance of the quantum dot fluorescent substance whose light emission peak wavelength is 555 nm, and the quantum dot fluorescent substance whose luminous peak wavelength is 630 nm are included.

  The quantum dot phosphor having an emission peak wavelength of 480 nm has a half-width of light intensity of 45 nm and an intensity ratio of 32. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having a light peak wavelength of 530 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 45 nm and an intensity ratio of 61. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 45 nm and an intensity ratio of 95. In the illumination device 100 according to Comparative Example 4, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 38. FIG. 8 is a view showing an emission spectrum of the illumination device 100 according to Comparative Example 4. As shown in FIG. The color temperature of the emitted light of the illuminating device 100 which concerns on the comparative example 4 is 4956.5K, and Duv is -0.6.

  In the illumination device 100 according to Comparative Example 5, the phosphor plate 20 includes a quantum dot phosphor having an emission peak wavelength of 480 nm, a quantum dot phosphor having an emission peak wavelength of 505 nm, and a quantum dot phosphor having an emission peak wavelength of 530 nm. It includes six types of quantum dot phosphors: a quantum dot phosphor having an emission peak wavelength of 555 nm, a quantum dot phosphor having an emission peak wavelength of 580 nm, and a quantum dot phosphor having an emission peak wavelength of 630 nm.

  The quantum dot phosphor having an emission peak wavelength of 480 nm has a half-width of light intensity of 45 nm and an intensity ratio of 50. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having a light peak wavelength of 530 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 45 nm and an intensity ratio of 61. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 45 nm and an intensity ratio of 95. In the illumination device 100 according to Comparative Example 5, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 38. FIG. 9 is a diagram showing an emission spectrum of the illumination device 100 according to Comparative Example 5. As shown in FIG. The color temperature of the emitted light of the illuminating device 100 which concerns on the comparative example 5 is 4956.4K, and Duv is 0.0.

  In the illumination device 100 according to Comparative Example 6, the phosphor plate 20 includes a quantum dot phosphor having an emission peak wavelength of 480 nm, a quantum dot phosphor having an emission peak wavelength of 505 nm, and a quantum dot phosphor having an emission peak wavelength of 530 nm. 7 kinds of quantum dot phosphors having an emission peak wavelength of 555 nm, quantum dot phosphors having an emission peak wavelength of 580 nm, quantum dot phosphors having an emission peak wavelength of 605 nm, and quantum dot phosphors having an emission peak wavelength of 630 nm Quantum dot phosphors are included.

  The quantum dot phosphor having an emission peak wavelength of 480 nm has a half-width of light intensity of 45 nm and an intensity ratio of 66. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 45 nm and an intensity ratio of 35. The quantum dot phosphor having a light peak wavelength of 530 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 45 nm and an intensity ratio of 61. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having a light emission peak wavelength of 605 nm has a half intensity width of light intensity of 45 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 45 nm and an intensity ratio of 95. In the illumination device 100 according to Comparative Example 6, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 38. FIG. 10 is a view showing an emission spectrum of the illumination device 100 according to Comparative Example 6. As shown in FIG. The color temperature of the emitted light of the illuminating device 100 which concerns on the comparative example 6 is 4957.7 K, and Duv is -0.6.

  In each of the illumination devices 100 according to the comparative examples 1 to 6 described above, a part of the color rendering index R1 to R15 includes a relatively low value. However, for example, in the lighting devices 100 according to Comparative Examples 3 to 6, the color rendering index R12 having a low value in the general LED lighting device is improved.

[Examples 1 to 8]
Next, the illuminating device 100 which concerns on Examples 1-8 is demonstrated. In the illumination device 100 according to the first to eighth embodiments, the phosphor plate 20 includes the quantum dot phosphor having an emission peak wavelength of 480 nm, the quantum dot phosphor having an emission peak wavelength of 505 nm, and the quantum dot having an emission peak wavelength of 530 nm. The phosphor includes six types of quantum dot phosphors: phosphor, quantum dot phosphor having an emission peak wavelength of 555 nm, quantum dot phosphor having an emission peak wavelength of 580 nm, and quantum dot phosphor having an emission peak wavelength of 630 nm.

  In the illumination device 100 according to the first embodiment, the quantum dot phosphor having a light emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 100. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having a light peak wavelength of 530 nm has a half-width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 63. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 60 nm and an intensity ratio of 23. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 95. In the illumination device 100 according to the first embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 40. FIG. 11 is a diagram showing an emission spectrum of the illumination device 100 according to the first embodiment. The color temperature of the emitted light of the illumination device 100 according to the first embodiment is 6522.2 K, and Duv is 0.6.

  In the illumination device 100 according to the second embodiment, the quantum dot phosphor having a light emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 75. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having a light peak wavelength of 530 nm has a half-width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 63. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 95. In the illumination device 100 according to the second embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 38. FIG. 12 is a diagram showing an emission spectrum of the illumination device 100 according to the second embodiment. The color temperature of the emitted light of the illumination device 100 according to the second embodiment is 5716.4 K, and Duv is 0.3.

  In the illumination device 100 according to the third embodiment, the quantum dot phosphor having an emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 51. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having a light peak wavelength of 530 nm has a half-width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 63. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 20. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 95. In the illumination device 100 according to the third embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 38. FIG. 13 is a diagram showing an emission spectrum of the illumination device 100 according to the third embodiment. The color temperature of the emitted light of the illumination device 100 according to the third embodiment is 5042.1 K, and Duv is −0.4.

  In the illumination device 100 according to the fourth embodiment, the quantum dot phosphor having an emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 69. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 19. The quantum dot phosphor having a light peak wavelength of 530 nm has a half width of light intensity of 60 nm and an intensity ratio of 32. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 69. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 60 nm and an intensity ratio of 26. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 133. In the illumination device 100 according to the fourth embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 34. FIG. 14 is a diagram showing an emission spectrum of the illumination device 100 according to the fourth embodiment. The color temperature of the emitted light of the illuminating device 100 which concerns on Example 4 is 4506.6K, and Duv is -0.4.

  In the illumination device 100 according to the fifth embodiment, the quantum dot phosphor having an emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 75. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 18. The quantum dot phosphor having a light peak wavelength of 530 nm has a half width of light intensity of 60 nm and an intensity ratio of 43. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 75. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 60 nm and an intensity ratio of 32. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 170. In the illumination device 100 according to the fifth embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 30. FIG. 15 is a diagram showing an emission spectrum of the illumination device 100 according to the fifth embodiment. The color temperature of the emitted light of the illumination device 100 according to the fifth embodiment is 4033.8 K, and Duv is 0.3.

  In the illumination device 100 according to the sixth embodiment, the quantum dot phosphor having an emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 45. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 18. The quantum dot phosphor having a light peak wavelength of 530 nm has a half width of light intensity of 60 nm and an intensity ratio of 43. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 75. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 60 nm and an intensity ratio of 32. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 180. In the illumination device 100 according to the sixth embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 30. FIG. 16 is a diagram showing an emission spectrum of the illumination device 100 according to the sixth embodiment. The color temperature of the emitted light of the illumination device 100 according to the sixth embodiment is 3536.0 K, and Duv is 0.4.

  In the illumination device 100 according to the seventh embodiment, the quantum dot phosphor having an emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 35. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 18. The quantum dot phosphor having a light peak wavelength of 530 nm has a half value width of light intensity of 60 nm and an intensity ratio of 63. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 75. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half width of light intensity of 60 nm and an intensity ratio of 50. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 260. In the illumination device 100 according to the seventh embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 30. FIG. 17 is a diagram showing an emission spectrum of the illumination device 100 according to the seventh embodiment. The color temperature of the emitted light of the illuminating device 100 which concerns on Example 7 is 2969.1 K, and Duv is -0.5.

  In the illumination device 100 according to the eighth embodiment, the quantum dot phosphor having an emission peak wavelength of 480 nm has a half intensity width of light intensity of 60 nm and an intensity ratio of 25. The quantum dot phosphor having an emission peak wavelength of 505 nm has a half-width of light intensity of 60 nm and an intensity ratio of 17. The quantum dot phosphor having a light peak wavelength of 530 nm has a half width of light intensity of 60 nm and an intensity ratio of 60. The quantum dot phosphor having an emission peak wavelength of 555 nm has a half-width of light intensity of 60 nm and an intensity ratio of 70. The quantum dot phosphor having an emission peak wavelength of 580 nm has a half-width of light intensity of 60 nm and an intensity ratio of 46. The quantum dot phosphor having an emission peak wavelength of 630 nm has a half-width of light intensity of 60 nm and an intensity ratio of 277. In the illumination device 100 according to the eighth embodiment, the blue light having an emission peak wavelength of 441.5 nm emitted by the light emitting unit 10 has a half intensity width of light intensity of 20 and an intensity ratio of 25. FIG. 18 is a diagram showing an emission spectrum of the illumination device 100 according to the eighth embodiment. The color temperature of the emitted light of the illumination device 100 according to the eighth embodiment is 2715.2 K, and Duv is -0.7.

  In each of the illumination devices 100 according to the first to eighth embodiments described above, the color rendering index R1 to R15 does not include a value less than 79. In other words, in each of the lighting devices 100 according to the first to eighth embodiments, all of the color rendering index R1 to R15 are 79 or more. That is, it can be said that each of the illumination devices 100 according to the first to eighth embodiments is an illumination device in which color reproducibility is improved.

  The emission spectrum of the emitted light of each of the illumination devices 100 according to Examples 1 to 8 has a first peak located in the wavelength range of 420 nm to 460 nm and a second peak located in the wavelength range of 530 nm to 580 nm. It has a third peak located in the wavelength range of 605 nm to 655 nm, a first bottom located in the wavelength range of 440 nm to 480 nm, and a second bottom located in the wavelength range of 555 nm to 605 nm. More specifically, the first bottom is located in the wavelength range of 440 nm to 480 nm and in the longer wavelength side than the wavelength of the first peak. More specifically, the second bottom is located within a wavelength range of 555 nm or more and 605 nm or less and within a range longer than the wavelength of the second peak.

  The first peak is a peak belonging to the blue wavelength range, the second peak is a peak belonging to the green wavelength range, and the third peak is a peak belonging to the red wavelength range. The first bottom is a bottom belonging to the blue wavelength range, and the second bottom is a bottom belonging to the orange wavelength range.

  The first peak and the second peak mean that the light intensity has a local maximum value (that is, a maximum value) in the emission spectrum. The first peak and the second peak may be rephrased as a first convex portion and a second convex portion. The first bottom, the second bottom, and the third bottom mean that the light intensity takes a local minimum value (i.e., minimum value) in the emission spectrum. The first bottom, the second bottom, and the third bottom may be reworded as a first recess, a second recess, and a third recess.

  FIG. 19 is a diagram showing the ratio of the light intensity of the second peak, the third peak, the first bottom, and the second bottom to the light intensity of the first peak. In other words, FIG. 19 is a diagram showing the light intensities of the second peak, the third peak, the first bottom, and the second bottom when the light intensity of the first peak is 1.

  As shown in FIG. 11 to FIG. 19, in the emission spectrum of the emitted light of each of the lighting devices 100 according to Examples 1 to 8, the light intensity when the light intensity of the first peak is 1 is the first peak And 0.35 or more in a wavelength range longer than the wavelength and shorter than the wavelength of the third peak, and not less than 0.35. In other words, there is no wavelength range in which the light intensity is extremely small. Thereby, all the color rendering index numbers R1 to R15 can be made relatively high values.

  In addition, in the illuminating device 100 which concerns on Examples 1-8, the quantum dot fluorescent substance whose half value width is wider than the illuminating device 100 which concerns on Comparative Examples 1-6 is used. Specifically, in the illumination devices 100 according to the first to eighth embodiments, a quantum dot phosphor having a half width of 60 nm or more is used. Thereby, in the emission spectrum, the effect of easily reducing the wavelength range in which the light intensity is extremely small can be obtained. That is, it is possible to obtain the effect of easily achieving the emission spectra as described in Examples 1 to 8 above. The emission spectra as described in Examples 1 to 8 may be realized by a quantum dot phosphor whose half width is less than 60 nm.

  In addition, the emission spectra described in Examples 1 to 8 have only three peaks of the first peak, the second peak, and the third peak, but have other peaks in addition to the three peaks. It may be done. Similarly, the emission spectra described in Examples 1 to 8 may have only two bottoms, the first bottom and the second bottom, or have other bottoms besides the two bottoms. It is also good.

[Requirements for lighting devices with high color rendering index]
The requirements for a lighting device having such a high color rendering index will be described. FIG. 20 is a graph in which the color temperature and the ratio of the light intensity of the second peak to the first peak are plotted based on the data of FIG. The ratio of the light intensity of the second peak to the first peak is also described as the relative light intensity of the second peak. As shown in FIG. 20, the color temperature and the ratio of the light intensity of the second peak to the first peak have a strong correlation such that the correlation coefficient R ² = 0.9808. An approximate curve showing the relationship between the color temperature and the ratio of the light intensity of the second peak to the first peak is represented by the equation on the upper right of FIG.

Similarly, FIG. 21 is a graph in which the color temperature and the ratio of the light intensity of the third peak to the first peak are plotted based on the data of FIG. The ratio of the light intensity of the third peak to the first peak is also described as the relative light intensity of the third peak. As shown in FIG. 21, the color temperature and the ratio of the light intensity of the third peak to the first peak have a strong correlation such that the correlation coefficient R ² = 0.9716. An approximate curve showing the relationship between the color temperature and the ratio of the light intensity of the third peak to the first peak is represented by the equation on the upper right of FIG.

  FIG. 22 is a graph in which the color temperature and the ratio of the light intensity of the first bottom to the first peak are plotted based on the data of FIG. The ratio of the light intensity of the first bottom to the first peak is also described as the relative light intensity of the first bottom. As shown in FIG. 21, the color temperature and the ratio of the light intensity of the first bottom to the first peak have a relatively strong correlation when considered separately at 5000 K or more and 4500 K or less. An approximate curve showing the relationship between the color temperature and the ratio of the light intensity of the first bottom to the first peak is represented by the equation in FIG.

FIG. 23 is a graph plotting the color temperature and the ratio of the light intensity of the second bottom to the first peak, based on the data of FIG. The ratio of the light intensity of the second bottom to the first peak is also described as the relative light intensity of the second bottom. As shown in FIG. 22, the color temperature and the ratio of the light intensity of the second bottom to the first peak have a strong correlation such that the correlation coefficient R ² = 0.9772. An approximate curve showing the relationship between the color temperature and the ratio of the light intensity of the second bottom to the first peak is represented by the equation on the upper right of FIG.

  As described above, in the lighting device 100 in which all of the color rendering index R1 to R15 are relatively high, the color temperature, the relative light intensity of the second peak, the relative light intensity of the third peak, the first bottom It has been found that there is a strong correlation between the relative light intensity of and the relative light intensity of the second bottom. According to such correlation, in the lighting device 100 of a certain color temperature, it is possible to determine the requirements that the emission spectrum should satisfy in order to increase all of the color rendering index R1-15.

  For example, FIG. 24 is a diagram showing the color temperature standard defined by ANSI. As shown in FIG. In the color temperature standard defined by ANSI, the nominal color temperature of the light emitted from the lighting device 100 and the tolerance of the nominal color temperature (in other words, the specific color temperature range) are defined. By using the formulas in FIGS. 20 to 23 and the tolerance of the nominal color temperature in FIG. 24, the requirements that the emission spectrum should satisfy in order to increase all of the color rendering index numbers R1 to R15 are determined.

[Requirements for lighting devices with 6500 K color temperature of outgoing light]
For example, the lighting device 100 with a nominal color temperature of 6500 K specifically has a color temperature of 6530 ± 510 K for the emitted light. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 6500 K can be a relative light intensity corresponding to the range of 6530 ± 510 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak may be 0.53 or more and less than 0.65.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 6500 K may be a relative light intensity corresponding to the range of 6530 ± 510 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 0.49 or more and less than 0.66.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 6500 K may have a relative light intensity corresponding to the range of 6530 ± 510 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.54 or more and less than 0.69.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 6500 K may have a relative light intensity corresponding to the range of 6530 ± 510 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 0.39 or more and less than 0.50.

[Requirements to be fulfilled by a lighting device with a color temperature of 5700 K of emitted light]
For example, in the lighting device 100 having a nominal color temperature of 5700K, specifically, the emitted light has a color temperature of 5665 ± 355K. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 5700 K can be a relative light intensity corresponding to the range of 5665 ± 355 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak may be 0.65 or more and less than 0.76.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 5700 K may have a relative light intensity corresponding to the range of 5665 ± 355 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 0.66 or more and less than 0.85.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 5700 K may have a relative light intensity corresponding to the range of 5665 ± 355 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.45 or more and less than 0.54.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 5700 K may have a relative light intensity corresponding to the range of 5665 ± 355 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 0.50 or more and less than 0.60.

[Requirements for lighting devices with color temperature of 5000K to meet]
For example, the lighting device 100 with a nominal color temperature of 5000K specifically has a color temperature of 5028 ± 283K for emitted light. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 5000 K can be a relative light intensity corresponding to the range of 5028 ± 283 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak may be 0.76 or more and less than 0.87.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 5000 K may be a relative light intensity corresponding to the range of 5028 ± 283 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 0.85 or more and less than 1.10.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 5000 K may have a relative light intensity corresponding to the range of 5028 ± 283 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.38 or more and less than 0.45.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 5000K may have a relative light intensity corresponding to the range of 5028 ± 283K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 0.6 or more and less than 0.71.

[Requirements for lighting devices with color temperature of 4,500 K emitted light to meet]
For example, in the lighting device 100 with a nominal color temperature of 4500 K, specifically, the emitted light has a color temperature of 4503 ± 243 K. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 4500 K can be a relative light intensity corresponding to the range of 4503 ± 243 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak may be 0.87 or more and less than 0.99.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 4500 K may be a relative light intensity corresponding to the range of 4503 ± 243 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 1.10 or more and less than 1.33.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 4500 K may have a relative light intensity corresponding to the range of 4503 ± 243 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.57 or more and less than 0.65.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 4500 K may have a relative light intensity corresponding to the range of 4503 ± 243 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 0.71 or more and less than 0.84.

[Requirements for lighting devices with color temperature of 4000K to meet]
For example, in the lighting device 100 having a nominal color temperature of 4000 K, specifically, the emitted light has a color temperature of 3985 ± 275 K. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 4000 K can be a relative light intensity corresponding to the range of 3985 ± 275 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity in the second peak to the light intensity in the first peak may be 0.99 or more and less than 1.18.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 4000 K may have a relative light intensity corresponding to the range of 3985 ± 275 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 1.33 or more and less than 1.75.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 4000 K may have a relative light intensity corresponding to the range of 3985 ± 275 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.49 or more and less than 0.57.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 4000 K may have a relative light intensity corresponding to the range of 3985 ± 275 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 0.84 or more and less than 1.03.

[Requirements to be satisfied by a lighting device with a color temperature of 3500 K of emitted light]
For example, the lighting device 100 with a nominal color temperature of 3500 K, specifically, emits light with a color temperature of 3465 ± 245 K. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 3500 K can be a relative light intensity corresponding to the range of 3465 ± 245 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak may be 1.18 or more and less than 1.40.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 3500 K may have a relative light intensity corresponding to the range of 3465 ± 245 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 1.75 or more and less than 2.33.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 3500 K may have a relative light intensity corresponding to the range of 3465 ± 245 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.42 or more and less than 0.49.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 3500 K may have a relative light intensity corresponding to the range of 3465 ± 245 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 1.03 or more and less than 1.28.

[Requirements to be fulfilled by a lighting device with a color temperature of 3000K]
For example, in the lighting device 100 having a nominal color temperature of 3000K, specifically, the emitted light has a color temperature of 3045 ± 175K. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 3000 K can be a relative light intensity corresponding to the range of 3045 ± 175 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak may be 1.40 or more and less than 1.61.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 3000 K may be a relative light intensity corresponding to the range of 3045 ± 175 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 2.33 or more and less than 2.93.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 3000 K may have a relative light intensity corresponding to the range of 3045 ± 175 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.38 or more and less than 0.42.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 3000 K may have a relative light intensity corresponding to the range of 3045 ± 175 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 1.28 or more and less than 1.52.

[Requirements to be fulfilled by a lighting device with a color temperature of 2700 K of emitted light]
For example, the lighting device 100 having a nominal color temperature of 2700 K specifically has a color temperature of 2725 ± 145 K of the emitted light. In order to increase all of the color rendering index R1-15, the second peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 2700 K can be a relative light intensity corresponding to the range of 2725 ± 145 K in the equation in FIG. Just do it. Specifically, in the emission spectrum, the ratio of the light intensity in the second peak to the light intensity in the first peak may be 1.61 or more and less than 1.84.

  Similarly, the third peak of the emission spectrum of the lighting device 100 with a nominal color temperature of 2700 K may have a relative light intensity corresponding to the range of 2725 ± 145 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the third peak to the light intensity at the first peak may be 2.93 or more and less than 3.63.

  The first bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 2700 K may have a relative light intensity corresponding to the range of 2725 ± 145 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity at the first bottom to the light intensity at the first peak may be 0.33 or more and less than 0.38.

  The second bottom of the emission spectrum of the lighting device 100 with a nominal color temperature of 2700 K may have a relative light intensity corresponding to the range of 2725 ± 145 K in the equation in FIG. Specifically, in the emission spectrum, the ratio of the light intensity in the second bottom to the light intensity in the first peak may be 1.52 or more and less than 1.79.

[Modification 1]
In the first embodiment, light emission having a first peak, a second peak, a third peak, a first bottom, and a second bottom by a blue LED chip and a plurality of types of quantum dot phosphors having different emission peak wavelengths Although the spectrum (hereinafter, also described as the emission spectrum according to the above-mentioned Embodiment 1) is realized, the method of realizing such an emission spectrum is an example.

  For example, in order to realize the emission spectrum according to the first embodiment, an ultraviolet LED chip that emits ultraviolet light having a wavelength shorter than that of blue light is used instead of or in addition to the blue LED chip It is also good. When an ultraviolet LED chip is used instead of the blue LED chip, the first peak may be realized by, for example, a phosphor emitting blue light.

  Further, as the light emitting particles, instead of the quantum dot phosphor, other inorganic phosphors other than the quantum dot phosphor may be used. The other inorganic phosphors are YAG-based phosphors and the like. In addition, both quantum dot phosphors and other inorganic phosphors may be used as light emitting particles.

  In addition, the emission spectrum according to the first embodiment is realized by six types of phosphors having different emission peak wavelengths, but may be realized by seven or more types of phosphors having different emission peak wavelengths. It may be realized by less than 6 phosphors.

  Further, the emission peak wavelength of the quantum dot phosphor described in the first embodiment is an example. For example, a quantum dot phosphor having an emission peak wavelength different by about ± 10 nm from the quantum dot phosphor described in the first embodiment may be used.

  In addition, the light emission spectrum according to the first embodiment may be realized by only the light emitting element among the light emitting element and the light emitting particles. That is, the illumination device 100 may not include the wavelength conversion material such as the phosphor plate 20. For example, the emission spectrum according to the first embodiment may be realized by a plurality of LED chips having different emission peak wavelengths.

[Modification 2]
The present invention may also be realized as a light emitting device 30. In other words, the light emitting device 30 is a light emitting module used as a light source of the lighting device of the first embodiment. The present invention may be realized, for example, as a light emitting device having a COB structure that emits emitted light having the light emission spectrum according to the first embodiment. The light emitting device of the COB structure has a structure in which a light emitting element mounted on a substrate is sealed by a sealing member containing light emitting particles. The sealing member is, for example, a member having a light transmitting resin material such as silicone resin as a base material.

  In addition, the present invention may be realized as a light emitting device having an SMD (Surface Mount Device) structure. The light emitting device of the SMD structure has a structure in which an SMD type element is mounted on a substrate. The SMD type device has a structure in which a light emitting device disposed in a container is sealed by a sealing member including light emitting particles filled in the container. Also, the present invention may be realized as a remote phosphor type light emitting device. In any case, as the combination of the light emitting element and the light emitting particle used for the light emitting device, various combinations as described in the first modification can be applied.

  The present invention may be realized as an SMD type element used for the light emitting device of the above-mentioned SMD structure.

[Effects, etc.]
As described above, the lighting device 100 includes the LED chip 12 that emits primary light, and phosphor particles 22 that are excited by the primary light and emit secondary light. The LED chip 12 is an example of a light emitting element, and the phosphor particles 22 are an example of a light emitting particle. The lighting device 100 emits outgoing light including primary light and secondary light. The emission spectrum of the emitted light has a first peak located in the wavelength range of 420 nm to 460 nm, a second peak located in the wavelength range of 530 nm to 580 nm, and a third peak located in the wavelength range of 605 nm to 655 nm And a first bottom located in the wavelength range of 440 nm to 480 nm and a second bottom located in the wavelength range of 555 nm to 605 nm.

  Thus, as in the first to eighth embodiments, the lighting device 100 in which all of the color rendering index R1 to R15 are relatively high is realized. In other words, the lighting device 100 with improved color reproducibility is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 0.53 or more and less than 0.65, and the light intensity at the third peak relative to the light intensity at the first peak A ratio is 0.49 or more and less than 0.66. For example, the ratio of light intensity at the first bottom to light intensity at the first peak is 0.54 or more and less than 0.69, and the ratio of light intensity at the second bottom to light intensity at the first peak is 0.39. More than 0.50.

  As a result, the lighting device 100 that emits the emitted light of the nominal color temperature 6500 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 0.65 or more and less than 0.76, and the light intensity at the third peak to the light intensity at the first peak The ratio of is more than 0.66 and less than 0.85. For example, the ratio of light intensity at the first bottom to light intensity at the first peak is at least 0.45 and less than 0.54, and the ratio of light intensity at the second bottom to light intensity at the first peak is 0.50. More than 0.60.

  As a result, the lighting device 100 that emits the emitted light of the nominal color temperature 5700 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 0.76 or more and less than 0.87, and the light intensity at the third peak to the light intensity at the first peak Ratio is 0.85 or more and less than 1.10. For example, the ratio of the light intensity at the first bottom to the light intensity at the first peak is 0.38 or more and less than 0.45, and the ratio of the light intensity at the second bottom to the light intensity at the first peak is 0.6 More than 0.71.

  As a result, the lighting device 100 that emits the emitted light of the nominal color temperature 5000 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 0.87 or more and less than 0.99, and the light at the third peak to the light intensity at the first peak The ratio of strengths is greater than or equal to 1.10 and less than 1.33. For example, the ratio of the light intensity at the first bottom to the light intensity at the first peak is 0.57 or more and less than 0.65, and the ratio of the light intensity at the second bottom to the light intensity at the first peak is 0.71. More than 0.84.

  As a result, the lighting device 100 which emits the emitted light of the nominal color temperature 4500 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 0.99 or more and less than 1.18, and the light intensity at the third peak to the light intensity at the first peak The ratio of is greater than or equal to 1.33 and less than 1.75. For example, the ratio of light intensity at the first bottom to light intensity at the first peak is 0.49 or more and less than 0.57, and the ratio of light intensity at the second bottom to light intensity at the first peak is 0.84. More than 1.03.

  As a result, the lighting device 100 that emits the emitted light of the nominal color temperature 4000 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 1.18 or more and less than 1.40, and the light intensity at the third peak to the light intensity at the first peak The ratio of is 1.75 to 2.33. For example, the ratio of the light intensity at the first bottom to the light intensity at the first peak is 0.42 or more and less than 0.49, and the ratio of the light intensity at the second bottom to the light intensity at the first peak is 1.03. More than 1.28.

  As a result, the lighting device 100 that emits the emitted light of the nominal color temperature 3500 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 1.40 or more and less than 1.61, and the light intensity at the third peak to the light intensity at the first peak The ratio of is greater than or equal to 2.33 and less than 2.93. For example, the ratio of the light intensity at the first bottom to the light intensity at the first peak is 0.38 or more and less than 0.42, and the ratio of the light intensity at the second bottom to the light intensity at the first peak is 1.28 More than 1.52.

  As a result, the lighting device 100 that emits the emitted light having the nominal color temperature of 3000 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, in the emission spectrum, the ratio of the light intensity at the second peak to the light intensity at the first peak is 1.61 or more and less than 1.84, and the light intensity at the third peak to the light intensity at the first peak The ratio of is greater than or equal to 2.93 and less than 3.63. For example, the ratio of the light intensity at the first bottom to the light intensity at the first peak is 0.33 or more and less than 0.38, and the ratio of the light intensity at the second bottom to the light intensity at the first peak is 1.52 More than 1.79.

  As a result, the lighting device 100 that emits the emitted light of the nominal color temperature 2700 K determined by ANSI, and in which all of R1 to R15 are relatively high, is realized.

  Also, for example, when the light intensity of the first peak is 1 in the emission spectrum, the light intensity in the wavelength range longer than the wavelength of the first peak and shorter than the wavelength of the third peak is 0.35 or more .

  Thus, a lighting device 100 in which all of R1 to R15 are relatively high is realized. In other words, the lighting device 100 with improved color reproducibility is realized.

  In addition, the light emitting device 30 includes an LED chip 12 that emits primary light, and phosphor particles 22 that are excited by the primary light and emit secondary light. The LED chip 12 is an example of a light emitting element, and the phosphor particles 22 are an example of a light emitting particle. The light emitting device 30 emits outgoing light including primary light and secondary light. The emission spectrum of the emitted light has a first peak located in the wavelength range of 420 nm to 460 nm, a second peak located in the wavelength range of 530 nm to 580 nm, and a third peak located in the wavelength range of 605 nm to 655 nm And a first bottom located in the wavelength range of 440 nm to 480 nm and a second bottom located in the wavelength range of 555 nm to 605 nm.

  Thus, as in the first to eighth embodiments, the light emitting device 30 in which all of the color rendering index numbers R1 to R15 are relatively high is realized. In other words, the light emitting device 30 with improved color reproducibility is realized.

Second Embodiment
[Basic configuration]
As described above, the present invention may be realized as a light emitting device of the COB structure having the light emission spectrum according to the first embodiment. In Embodiment 2, a specific structure of a light emitting device having a COB structure will be described. FIG. 25 is an external perspective view of a light emitting device having a COB structure. FIG. 26 is a schematic cross-sectional view of a light emitting device having a COB structure.

  As shown in FIGS. 25 and 26, the light emitting device 30a includes a substrate 11, a plurality of LED chips 12, a sealing member 13a, a dam member 15, and a bonding wire 17.

  The substrate 11 and the plurality of LED chips 12 have the same configuration as the light emitting device 10. The plurality of LED chips 12 are mainly electrically connected by a chip to chip by bonding wires 17. The bonding wire 17 is a wire for power supply electrically and structurally connected to the LED chip 12. In addition, as a metal material of the bonding wire 17, gold (Au), silver (Ag), copper (Cu) etc. are employ | adopted, for example.

  The dam material 15 is a member provided on the substrate 11 for clamping the sealing member 13 a. For the dam material 15, for example, a thermosetting resin or a thermoplastic resin having an insulating property is used. More specifically, silicone resin, phenol resin, epoxy resin, bismaleimide triazine resin, or polyphthalamide (PPA) resin is used as the dam material 15.

The dam material 15 desirably has light reflectivity to increase the light extraction efficiency of the light emitting device 10. Therefore, white resin (so-called white resin) is used for the dam material 15. In addition, in order to improve the light reflectivity of the dam material 15, particles such as TiO ₂ , Al ₂ O ₃ , ZrO ₂ , and MgO may be included in the dam material 15.

  In the light emitting device 30a, the dam member 15 is formed in an annular shape so as to surround the plurality of LED chips 12 when viewed from above. A sealing member 13 a is provided in the area surrounded by the dam material 15. In addition, the dam material 15 may be formed in an annular shape having a rectangular outer shape.

  The sealing member 13 a is a sealing member that seals the plurality of LED chips 12. More specifically, the sealing member 13 a seals a part of the plurality of LED chips 12, the bonding wires 17, and the wirings 16.

  The base material of the sealing member 13a is a translucent resin material. As a translucent resin material, for example, a methyl silicone resin is used, but an epoxy resin or a urea resin may be used.

  The sealing member 13 a contains phosphor particles 22. More specifically, the sealing member 13 includes a plurality of types of quantum dot phosphors having different emission peak wavelengths. Thereby, the emission spectrum according to the above-mentioned Embodiment 1 is realized.

[Modification 1 of Embodiment 2]
In the light emitting device 30a, the plurality of LED chips 12 and the bonding wires 17 are sealed by the sealing member 13 having a single layer structure, but the plurality of LED chips 12 and the bonding wires 17 are formed by a sealing member having a multilayer structure. It may be sealed. FIG. 27 is a schematic cross-sectional view of the light emitting device according to the first modification of the second embodiment.

  A light emitting device 30b shown in FIG. 27 includes a sealing member 13b having a two-layer structure. The sealing member 13 b includes a first sealing layer 13 b 1 for sealing the plurality of LED chips 12 and a second sealing layer 13 b 2 formed on the first sealing layer 13 b 1.

  The base of the first sealing layer 13b1 and the base of the second sealing layer 13b2 are the same as the base of the sealing member 13a. The first sealing layer 13 b 1 is a transparent layer that does not contain the phosphor particles 22. The second sealing layer 13 b 2 contains phosphor particles 22. More specifically, the second sealing layer 13b2 includes a plurality of types of quantum dot phosphors having different emission peak wavelengths. Thereby, the emission spectrum according to the above-mentioned Embodiment 1 is realized.

[Modification 2 of Embodiment 2]
FIG. 28 is a schematic cross-sectional view of a light emitting device according to a second modification of the second embodiment. A light emitting device 30c shown in FIG. 28 includes a sealing member 13c having a two-layer structure. The sealing member 13 c includes a first sealing layer 13 c 1 filling the gaps between the plurality of LED chips 12 and a second sealing layer 13 c 2 formed on the first sealing layer 13 c 1 and the plurality of LED chips 12. .

  The base of the first sealing layer 13c1 and the base of the second sealing layer 13c2 are the same as the base of the sealing member 13a. The first sealing layer 13 c 1 contains phosphor particles 22. More specifically, the first sealing layer 13c1 includes a plurality of types of quantum dot phosphors having different emission peak wavelengths. Thereby, the emission spectrum according to the above-mentioned Embodiment 1 is realized. The second sealing layer 13c2 is, for example, a transparent layer that does not contain the phosphor particles 22.

[Modification 3 of Embodiment 2]
29 is a schematic cross-sectional view of a light emitting device according to Variation 3 of Embodiment 2. FIG. A light emitting device 30d shown in FIG. 29 includes a sealing member 13d having a multilayer structure. The sealing member 13d includes a sealing layer 13d1 for sealing the plurality of LED chips 12, and sealing layers 13d2 to 13d5 stacked on the sealing layer 13d1.

  The base material of the plurality of sealing layers 13d1 to 13d5 is the same as the base material of the sealing member 13a. The sealing layer 13 d 1 is a transparent layer which does not contain the phosphor particles 22. Each of sealing layers 13 d 2 to 13 d 5 contains phosphor particles 22. More specifically, each of the sealing layers 13d2 to 13d5 includes one of a plurality of types of quantum dot phosphors for realizing the light emission spectrum according to the first embodiment. The sealing layers 13d2 to 13d5 include, for example, quantum dot phosphors whose fluorescence peak wavelength is longer as the sealing layer is closer to the sealing layer 13d1. Specifically, the sealing layer 13d2 contains a red-based quantum dot phosphor, the sealing layer 13d3 contains a yellow-based quantum dot phosphor, and the sealing layer 13d4 has a yellow-green-based quantum dot fluorescence The sealing layer 13d5 includes a green quantum dot phosphor. Thereby, it is suppressed that the fluorescence radiate | emitted from the sealing layer located below is absorbed by the fluorescent substance particle 22 of the sealing layer located above. That is, the utilization efficiency of fluorescence is improved.

[Modification 4 of Embodiment 2]
FIG. 30 is a schematic cross-sectional view of a light emitting device according to a fourth modification of the second embodiment. A light emitting device 30e shown in FIG. 30 includes a sealing member 13e. The sealing member 13e includes a sealing layer 13e1 in which a substantially hemispherical (in other words, dot-like) recess is provided immediately above each of the plurality of LED chips 12, and sealing layers 13e2 to 13e5 formed in the recess. And

  The base material of the plurality of sealing layers 13e1 to 13e5 is the same as the base material of the sealing member 13a. The sealing layer 13 e 1 is a transparent layer not containing the phosphor particles 22. Each of sealing layers 13 e 2 to 13 e 5 contains phosphor particles 22. More specifically, each of the sealing layers 13e2 to 13e5 includes one of a plurality of types of quantum dot phosphors for realizing the light emission spectrum according to the first embodiment. For example, the sealing layer 13e2 contains a red-based quantum dot phosphor, the sealing layer 13e3 contains a yellow-based quantum dot phosphor, and the sealing layer 13e4 contains a yellow-green-based quantum dot phosphor The sealing layer 13e5 includes a green quantum dot phosphor.

[Modification 5 of Embodiment 2]
FIG. 31 is a schematic cross-sectional view of a light emitting device according to a fifth modification of the second embodiment. A light emitting device 30f shown in FIG. 31 includes a sealing member 13f. The sealing member 13 f includes a sealing layer 13 f 1 for sealing the plurality of LED chips 12 and sealing layers 13 f 2 to 13 f 5 arranged on the upper surface of the sealing layer f 1 along the upper surface. The sealing layers 13f2 to 13f5 are arranged like a patchwork on the sealing layer 13f1. The plurality of LED chips 12 correspond to the sealing layers 13f2 to 13f5 on a one-to-one basis.

  The base material of the plurality of sealing layers 13f1 to 13f5 is the same as the base material of the sealing member 13a. The sealing layer 13 f 1 is a transparent layer which does not contain the phosphor particles 22. Each of sealing layers 13 f 2 to 13 f 5 contains phosphor particles 22. More specifically, each of the sealing layers 13f2 to 13f5 includes one of a plurality of types of quantum dot phosphors for realizing the light emission spectrum according to the first embodiment. For example, the sealing layer 13f2 contains a red-based quantum dot phosphor, the sealing layer 13f3 contains a yellow-based quantum dot phosphor, and the sealing layer 13f4 contains a yellow-green-based quantum dot phosphor The sealing layer 13f5 includes a green quantum dot phosphor.

(Other embodiments)
As mentioned above, although the light-emitting device which concerns on embodiment, and the illuminating device were demonstrated, this invention is not limited to the said embodiment.

  For example, in the first embodiment, the lighting device is a downlight, but the present invention may be realized as a lighting device other than a downlight, such as a spotlight, a ceiling light, or a base light.

  In addition, the stacked structure of the light emitting device described in Embodiment 2 is an example. In Embodiment 2, the phosphor layer may be included in the sealing layer described as not including the phosphor particles, or the phosphor layer may be included in the sealing layer described as including the phosphor particles. It does not have to be. Also, two or more types of quantum dot phosphors may be included in the sealing layer described as including one type of quantum dot phosphor. In the second embodiment, the quantum dot phosphor may be replaced by another inorganic phosphor other than the quantum dot phosphor.

  Moreover, in the said embodiment, the LED chip was illustrated as a light emitting element used for a light-emitting device. However, a semiconductor light emitting element such as a semiconductor laser, or a solid light emitting element such as organic EL (Electro Luminescence) or inorganic EL may be adopted as the light emitting element.

  In addition, the embodiments can be realized by various combinations that each person skilled in the art can think of for each embodiment, or by combining components and functions in each embodiment without departing from the scope of the present invention. The embodiments of the present invention are also included in the present invention. For example, a lighting device or a light emitting device according to a comparative example in the above embodiment may be included in the present invention.

12 LED chip (light emitting element)
22 Phosphor particles (luminescent particles)
30, 30a, 30b, 30c, 30d, 30e, 30f Light Emitting Device 100 Lighting Device

Claims (11)

A light emitting element that emits primary light;
Luminescent particles that are excited by the primary light to emit secondary light;
Emitting light including the primary light and the secondary light;
The emission spectrum of the emitted light is
A first peak located in a wavelength range of 420 nm or more and 460 nm or less;
A second peak located in a wavelength range of 530 nm to 580 nm,
A third peak located in a wavelength range of 605 nm or more and 655 nm or less;
A first bottom located in a wavelength range of 440 nm or more and 480 nm or less,
An illumination device comprising: a second bottom located in a wavelength range of 555 nm or more and 605 nm or less. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 0.53 or more and less than 0.65,
The ratio of light intensity at the third peak is 0.49 or more and less than 0.66,
The ratio of light intensity in the first bottom is 0.54 or more and less than 0.69,
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 0.39 or more and less than 0.50. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 0.65 or more and less than 0.76,
The ratio of light intensity at the third peak is 0.66 or more and less than 0.85,
The ratio of light intensity at the first bottom is at least 0.45 and less than 0.54;
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 0.50 or more and less than 0.60. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 0.76 or more and less than 0.87,
The ratio of light intensity at the third peak is 0.85 or more and less than 1.10.
The ratio of light intensity in the first bottom is 0.38 or more and less than 0.45,
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 0.6 or more and less than 0.71. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 0.87 or more and less than 0.99,
The ratio of light intensity at the third peak is 1.10 or more and less than 1.33.
The ratio of light intensity in the first bottom is 0.57 or more and less than 0.65,
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 0.71 or more and less than 0.84. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 0.99 or more and less than 1.18,
The ratio of light intensity at the third peak is 1.33 or more and less than 1.75,
The ratio of light intensity in the first bottom is 0.49 or more and less than 0.57,
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 0.84 or more and less than 1.03. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 1.18 or more and less than 1.40,
The ratio of light intensity at the third peak is 1.75 or more and less than 2.33,
The ratio of light intensity in the first bottom is 0.42 or more and less than 0.49,
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 1.03 or more and less than 1.28. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 1.40 or more and less than 1.61;
The ratio of light intensity at the third peak is 2.33 or more and less than 2.93,
The ratio of light intensity in the first bottom is 0.38 or more and less than 0.42.
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 1.28 or more and less than 1.52. In the emission spectrum, relative to the light intensity at the first peak,
The ratio of light intensity at the second peak is 1.61 or more and less than 1.84,
The ratio of light intensity at the third peak is 2.93 or more and less than 3.63.
The ratio of light intensity in the first bottom is 0.33 or more and less than 0.38,
The lighting device according to claim 1, wherein a ratio of light intensity in the second bottom is 1.52 or more and less than 1.79. In the emission spectrum, when the light intensity of the first peak is 1, the light intensity in a wavelength range longer than the wavelength of the first peak and shorter than the wavelength of the third peak is 0.35 or more. The lighting device according to any one of Items 1 to 9. A light emitting element that emits primary light;
Luminescent particles that are excited by the primary light to emit secondary light;
Emitting light including the primary light and the secondary light;
The emission spectrum of the emitted light is
A first peak located in a wavelength range of 420 nm or more and 460 nm or less;
A second peak located in a wavelength range of 530 nm to 580 nm,
A third peak located in a wavelength range of 605 nm or more and 655 nm or less;
A first bottom located in a wavelength range of 440 nm or more and 480 nm or less,
What is claimed is: 1. A light emitting device comprising: a second bottom located in a wavelength range of 555 nm to 605 nm

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