Light emitting device

Abstract

The light emitting device of the present application has: one or more light emitting elements; and multiple phosphors including at least a rare earth aluminate phosphor, a rare earth aluminum garnet phosphor, and a fluoride phosphor having a light emission peak near 630 nm, and emits light having a value of color rendering index R9 of 50 or more, which is light including fluorescence generated by the fluoride phosphor and having a first color temperature of 1,500 K or more and 3,500 K or less; light having a value of color rendering index R9 of 50 or more, which is light including fluorescence generated by the fluoride phosphor and having a second color temperature of 3,500 K or more and 5,500 K or less and higher than the first color temperature; and light including a third monochromatic light and fluorescence generated by the fluoride phosphor, having a correlated color temperature of 6,500 K, a value of color rendering index R9 of 50 or more, and a value of melatonin luminosity ratio of 1.0 or more, the third monochromatic light having values of X coordinate and Y coordinate in a chromaticity diagram of CIE 1931 smaller than values of X coordinate and Y coordinate at a color temperature of 5,500 K on a black body locus and a melatonin luminosity ratio of 1.8 or more.

Description

[0001] This application is a divisional application of the following patent application: filed on June 30, 2021, application number 202110733638.6, entitled "Light Emitting Device". Technical Field

[0002] This invention relates to light-emitting devices. Background Technology

[0003] Light, such as lamps or monitors, has become an indispensable element in human workspaces. Throughout the day, people spend a significant amount of time receiving light from inside buildings or computer equipment.

[0004] In recent years, there has been a trend towards emphasizing the impact on human health when creating work environments. One example is the WELL Building Standard certification system established by the International WELL Building Institute (IWBI). WELL certification evaluates buildings such as offices based on multiple criteria, including air, water, food, light, and comfort, and awards certification based on meeting established standards. For instance, regarding light in WELL certification, considerations include the visual environment, circadian rhythms, glare from appliances or sunlight, and color rendering index (CRI).

[0005] In addition, Patent Document 1 proposes a lighting device that supports human circadian rhythm.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 2018-511386 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] The aim is to provide a light-emitting device that takes into account circadian rhythms and color rendering properties.

[0011] Methods for solving problems

[0012] The light-emitting device disclosed in the embodiments includes one or more light-emitting elements and multiple phosphors, emitting: a first light generated by one or more light-emitting elements and one or more first phosphors among the one or more light-emitting elements and multiple phosphors; a second light generated by one or more light-emitting elements and one or more second phosphors, including at least one phosphor different from the first phosphor; and a third light generated by one or more light-emitting elements and one or more third phosphors, including at least one phosphor different from the first phosphor and multiple phosphors. The first light is light with a correlated color temperature of 1500K or higher and 3500K or lower, and a color rendering index (R9) of 50 or higher. The second light is light with a correlated color temperature of 3500K or higher and 5500K or lower, and a second color temperature higher than the first color temperature, and a color rendering index (R9) of 50 or higher. The third light is emitted in CIE... The X and Y coordinate values ​​in the chromaticity diagram of the 1931 color system are smaller than the X and Y coordinate values ​​at a color temperature of 5500K on the blackbody radiation locus. In light with a correlated color temperature of 6500K based on at least two of the first, second, and third lights, the color rendering index R9 is 50 or higher, and the melatonin illuminance ratio is 1.0 or higher.

[0013] In another embodiment of the light-emitting device, the color rendering index R15 is 85 or higher in light with a correlated color temperature of 6500K based on two or more lights, including at least the third light, of the first light, the second light, and the third light.

[0014] In another embodiment of the light-emitting device, the color rendering index R9 is 60 or higher in light with a correlated color temperature of 3500K or higher and 5500K or lower based on one or more of the first, second and third lights.

[0015] In another embodiment of the light-emitting device, the correlated color temperature of the first color temperature is above 1500K and below 2700K, and the average color rendering index Ra is above 80 in light based on the correlated color temperature of one or more of the first, second, and third lights within the range of above 2700K and below 6500K.

[0016] In another embodiment of the light-emitting device, the value of the melatonin illuminance ratio monotonically increases in light with a correlated color temperature of 2700K or higher and 6500K or lower based on one or more of the first, second, and third lights.

[0017] In another embodiment of the light-emitting device, the color rendering index R9 of the third light is less than 30.

[0018] The effects of the invention

[0019] According to the present invention, a light-emitting device that takes into account circadian rhythms and color rendering properties can be provided. Attached Figure Description

[0020] Figure 1 It is a graph representing the circadian rhythm response and the visibility (luminosity factor) response.

[0021] Figure 2 This is a schematic perspective view illustrating an example of a light-emitting device according to an embodiment.

[0022] Figure 3A This is a schematic cross-sectional view illustrating another example of a light-emitting device according to an embodiment.

[0023] Figure 3B This is a schematic cross-sectional view illustrating an example of an LED package with an embodiment described.

[0024] Figure 4 This is an example of the emission spectrum of the first light of the light-emitting device in the embodiment.

[0025] Figure 5 This is an example of the emission spectrum of the second light in the light-emitting device of the embodiment.

[0026] Figure 6 This is another example of the emission spectrum of the second light in the light-emitting device of the embodiment.

[0027] Figure 7 This is another example of the emission spectrum of the second light in the light-emitting device of the embodiment.

[0028] Figure 8 This is an example of the emission spectrum of the third light in the light-emitting device of the embodiment.

[0029] Figure 9 This is a system structure diagram illustrating an example of a color control system implementation.

[0030] Figure 10 It is a block diagram used to illustrate the hardware structure of an information processing device.

[0031] Label Explanation

[0032] 1. Light-emitting device

[0033] 12 Light-emitting elements

[0034] 14. Fluorescent cells

[0035] 2. Information processing device

[0036] 3. Dimming Decision Unit

[0037] 4. Sending Department

[0038] 70 CPU

[0039] 71 ROM

[0040] 72 RAM

[0041] 73 Storage

[0042] 74 Graphic I / F

[0043] 75 Data I / F

[0044] 76 Communication I / F

[0045] 77 Input devices

[0046] 10 Color Toning Control System Detailed Implementation

[0047] First, let's explain the effects of lighting on the human body.

[0048] Taking WELL certification as an example, as described in the background section, lighting design that takes into account circadian rhythms is required. Taking into account circadian rhythms refers to considering the circadian rhythm itself.

[0049] Human circadian rhythms are longer than a day, approximately 25 hours. If they are not aligned with a 24-hour cycle, they become a rhythmic cycle that deviates from the 24-hour cycle. Therefore, light plays a crucial role as a tuning factor for aligning with the 24-hour cycle. By being exposed to sunlight, the human biological clock is adjusted to a 24-hour cycle, thus, humans are born living within a 24-hour rhythm of waking up in the morning and sleeping at night.

[0050] In other words, the human body possesses the ability to regulate its circadian rhythm using light. Specifically, a very small region called the suprachiasmatic nucleus (IPN) exists in the hypothalamus of the brain, which plays a crucial role in governing the biological clock that governs the diurnal rhythm. Furthermore, the cells that provide light signals to the IPN are intrinsically photosensitive retinal ganglion cells (ipRGCs) in the retina.

[0051] Studies have shown that ipRGC contains a photoreceptor protein called melanopsin, which is involved in the light tuning of circadian rhythms. Melanopsin has absorption properties corresponding to the wavelength of light, with its peak value located around 480nm~490nm.

[0052] Furthermore, melatonin is believed to be involved in the secretion or inhibition of melatonin, a sleep-promoting hormone. For example, increasing stimulation of ipRGCs can inhibit melatonin secretion. Additionally, melatonin secretion typically peaks at night, promoting sleep. Therefore, melatonin secretion is suppressed during the day.

[0053] In the WELL certification mentioned above, in order to evaluate whether the lighting design takes into account the circadian rhythm, the equivalent melatonin illuminance (EML) is introduced. EML is calculated by the following equation (1).

[0054]

[0055] In addition, the Meranopic Ratio (hereinafter referred to as MR) in Equation (1) is obtained by Equation (2) below.

[0056]

[0057] Here, Light represents the spectral distribution of light produced by lighting fixtures, Circadian represents the diurnal rhythm response based on the spectral sensitivity characteristics of melanopsin, which has a peak around 480nm~490nm, and Visual represents the visibility response. Figure 1 The curves describing the diurnal rhythm response and the visibility response are presented.

[0058] As shown in equation (1), increasing the value of EML can be achieved by either increasing illuminance or increasing MR. Furthermore, it can be seen that MR has a greater dependence on the characteristics of circadian rhythm than illuminance. Therefore, considering circadian rhythm, the value of MR is considered preferable.

[0059] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. However, the embodiments shown below are for embodying the technical concept of the present invention and do not limit the present invention. In addition, in the following description, detailed descriptions of the same names and reference numerals denote the same or homogeneous parts are appropriately omitted. Furthermore, for clarity, the size and positional relationships of the parts shown in the accompanying drawings may sometimes be exaggerated.

[0060] Furthermore, the relationship between color names and chromaticity coordinates, and the relationship between the wavelength range of light and the color names of monochromatic light, should follow JIS Z8110. Additionally, the color rendering index should follow JIS Z8726.

[0061] <Implementation Method>

[0062] The light-emitting device 1 of the embodiment will be described. The light-emitting device 1 is, for example, a lighting device. Alternatively, it is, for example, a display device such as a television or computer monitor. Alternatively, it is, for example, a package mounted on a lighting device or display device, which carries a light-emitting element such as an LED (Light Emitting Diode). Alternatively, it may not be limited to these.

[0063] Figure 2 This is an example of a light-emitting device 1 used as a lighting device. Additionally, Figure 3A This is an example of a light-emitting device 1 as an LED package. For example, as... Figure 2 The lighting device shown has multiple light-emitting devices 1 installed. Figure 3A The LED package shown is an example of an LED package. Alternatively, for example, instead of an LED package having multiple light-emitting elements 12 and multiple phosphors 14, a package like the one shown is also possible. Figure 3B As shown, multiple LED packages are mounted on each of the light-emitting elements 12, each having one or more phosphors 14.

[0064] The light-emitting device 1 is capable of varying the correlated color temperature of the emitted light (hereinafter referred to as emitted light). Furthermore, in practice, the mechanism controlling this variation can be implemented either within the light-emitting device 1 or via an external device connected to the light-emitting device 1. At least the light-emitting device 1 is capable of emitting emitted light with different correlated color temperatures.

[0065] If the light-emitting device 1 is an illumination device, then the emitted light is illumination emitted from the illumination device. Alternatively, if the light-emitting device 1 is a display device, then the emitted light is, for example, a backlight. If the light-emitting device 1 is a package, then the emitted light is light emitted from the package to the outside.

[0066] The light-emitting device 1 includes one or more light-emitting elements 12 and multiple phosphors 14. Furthermore, the light-emitting device 1 includes various phosphors 14 with different compositions. Moreover, by using one or more light-emitting elements 12 and one or more phosphors 14 selected from the one or more light-emitting elements 12 and multiple phosphors 14, the light-emitting device 1 emits multiple lights with different emission spectra. Furthermore, by mixing these multiple lights in adjusted proportions, the light-emitting device 1 can vary the correlated color temperature within a specified range.

[0067] For example, the light-emitting device 1 can vary the correlated color temperature within a range of 2700K or higher and 6500K or lower. However, the range of correlated color temperature that can be varied in the light-emitting device 1 is not limited to this. For example, it could also be a range of 3000K or higher and 6000K or lower.

[0068] Here, the light generated by one or more selected light-emitting elements 12 and one or more phosphors 14 is referred to as single-unit light. That is, it can be said that the light-emitting device 1 emits multiple single-unit lights with different emission spectra. In addition, the light that is a mixture of multiple single-unit lights is referred to as mixed light. As emitted light, the light-emitting device 1 can emit single-unit light or mixed light.

[0069] The multiple individual lights emitted from the light-emitting device 1 are plotted on different chromaticity coordinates in the chromaticity diagram of the CIE 1931 colorimetric system (hereinafter referred to as the chromaticity diagram). In other words, the multiple individual lights emit light with different chromaticity coordinates in the chromaticity diagram.

[0070] In addition, at least two of the multiple individual light sources may use one or more different phosphors. Alternatively, one or more identical phosphors may be used. Or, all individual light sources may use one or more different phosphors.

[0071] Furthermore, the plurality of individual beams emitted from the light-emitting device 1 include at least three individual beams. Here, the three individual beams are referred to as the first beam, the second beam, and the third beam, respectively. Each beam will be described below.

[0072] (First Light)

[0073] The first light is light whose correlated color temperature is above 1500K and below 3500K. Here, it is assumed that when referring to the correlated color temperature of a specific light, unless otherwise specified, it refers to the correlated color temperature with a color deviation within ±0.02.

[0074] The first light emits light with an average color rendering index (Ra) of 80 or higher. Preferably, it emits light with an average color rendering index (Ra) of 90 or higher. More preferably, it emits light with an average color rendering index (Ra) of 95 or higher.

[0075] The first light emits light with a color rendering index (CRI) R9 of 50 or higher. Preferably, it emits light with a CRI R9 of 60 or higher. More preferably, it emits light with a CRI R9 of 65 or higher. The CRI R9 is a value used to evaluate the color rendering of red.

[0076] The first light emits light with a color rendering index (CRI) of 75 or higher. Preferably, it emits light with a CRI of 85 or higher. More preferably, it emits light with a CRI of 90 or higher. The CRI R15 is a value used to evaluate the color rendering of Japanese skin tones.

[0077] The first light emits light with an MR value of 0.70 or less. Preferably, it emits light with an MR value of 0.60 or less. More preferably, it emits light with an MR value of 0.55 or less.

[0078] For example, the first light is emitted by the light-emitting element 12, the rare-earth aluminate phosphor 14, and the fluoride phosphor 14. The light-emitting element 12 is a nitride semiconductor with an emission peak in the range of 410 nm to 490 nm, and the rare-earth aluminate phosphor 14 has a light produced by the formula Y3(Al,Ga)5O. 12 The fluoride phosphor 14, composed of the formula K2SiF6:Mn, is the main phosphor and exhibits an emission peak near 496 nm. 4+ The composition is indicated, and it has an emission peak near 630 nm.

[0079] Figure 4 This is a specific example of the emission spectrum of the first light. In this specific example, the correlated color temperature of the first light is 2700K, the average color rendering index Ra is 96, the color rendering index R9 is 68, the color rendering index R15 is 94, and the MR value is 0.51. The first light is excellent in both the average color rendering index Ra and the color rendering index R15, and it achieves a good color rendering index R9 while reducing the MR value.

[0080] Here, regarding the average color rendering index (CRI) Ra, a value of 80 or higher and less than 90 is considered good, and a value of 90 or higher is considered excellent. Similarly, regarding the CRI R9, a value of 50 or higher and less than 70 is considered good, and a value of 70 or higher is considered excellent. Furthermore, regarding the CRI R15, a value of 75 or higher and less than 85 is considered good, and a value of 85 or higher is considered excellent. Values ​​below the range considered good are considered poor.

[0081] (Second Light)

[0082] The second light is light whose correlated color temperature is above 3500K and below 5500K. Additionally, the second light is light whose correlated color temperature is above 3500K and below 4500K. Additionally, the second light is light whose correlated color temperature is above 4500K and below 5500K.

[0083] The second light emits light with an average color rendering index (Ra) of 80 or higher. Preferably, it emits light with an average color rendering index (Ra) of 90 or higher. More preferably, it emits light with an average color rendering index (Ra) of 95 or higher.

[0084] The second light emits light with a color rendering index (CRI) of 50 or higher. Preferably, it emits light with a CRI of 70 or higher. More preferably, it emits light with a CRI of 80 or higher.

[0085] The second light emits light with a color rendering index (CRI) R15 of 75 or higher. Preferably, it emits light with a CRI R15 of 85 or higher. More preferably, it emits light with a CRI R15 of 90 or higher. Particularly preferably, it emits light with a CRI R15 of 95 or higher.

[0086] The second light emits light with an MR value of 0.55 or higher and 1.00 or lower. Preferably, it emits light with an MR value of 0.60 or higher and 0.90 or lower. Even more preferably, it emits light with an MR value of 0.65 or higher and 0.75 or lower.

[0087] For example, the second light is emitted by the light-emitting element 12, the rare-earth aluminum garnet phosphor 14, and the fluoride phosphor 14. The light-emitting element 12 is a nitride semiconductor with an emission peak in the range of 410 nm to 490 nm, and the rare-earth aluminum garnet phosphor 14 has a composition of Lu3Al5O 12 The fluoride phosphor 14, composed of the formula K2SiF6:Mn, is used as the main phosphor and exhibits an emission peak near 520 nm. 4+ The composition is indicated, and it has an emission peak near 630 nm.

[0088] Figure 5 This is a specific example of the emission spectrum of the second light generated by such a light-emitting element 12 and phosphor 14. In this specific example, the correlated color temperature of the second light is 4000K, the average color rendering index Ra is 94, the color rendering index R9 is 82, the color rendering index R15 is 95, and the MR value is 0.69. The second light is excellent in terms of the average color rendering index Ra, color rendering index R9, and color rendering index R15.

[0089] Furthermore, for example, the second light is emitted by the light-emitting element 12, the rare-earth aluminate phosphor 14, and the fluoride phosphor 14. The second light-emitting element 12 is a nitride semiconductor with an emission peak in the range of 410 nm to 490 nm, and the rare-earth aluminate phosphor 14 has a composition of Y3(Al,Ga)5O. 12The fluoride phosphor 14, composed of the formula K2SiF6:Mn, is used as the main phosphor and exhibits an emission peak near 520 nm. 4+ The composition is indicated, and it has an emission peak near 630 nm.

[0090] Figure 6 This is another specific example of the emission spectrum of the second light generated by such a light-emitting element 12 and phosphor 14. In this specific example, the correlated color temperature of the second light is 5000K, the average color rendering index Ra is 94, the color rendering index R9 is 86, the color rendering index R15 is 95, and the MR value is 0.85. The second light is excellent in terms of the average color rendering index Ra, color rendering index R9, and color rendering index R15.

[0091] Figure 7 This is another specific example of the emission spectrum of the second light generated by such a light-emitting element 12 and phosphor 14. In this specific example, the correlated color temperature of the second light is 3500K, the average color rendering index Ra is 95, the color rendering index R9 is 79, the color rendering index R15 is 96, and the MR value is 0.62. The second light is excellent in terms of the average color rendering index Ra, color rendering index R9, and color rendering index R15.

[0092] (Third Light)

[0093] The third type of light is light whose X and Y coordinate values ​​in the chromaticity diagram are smaller than the X and Y coordinate values ​​at a color temperature of 5500K on the blackbody radiation locus. Additionally, light in the chromaticity diagram that is not plotted in the range of correlated color temperatures below 6500K is also not plotted. Furthermore, light in the chromaticity diagram that is not plotted in the range of correlated color temperatures below 8000K is also not plotted.

[0094] The third light emits light with an MR value of 1.80 or higher. Preferably, it emits light with an MR value of 2.00 or higher. More preferably, it emits light with an MR value of 2.20 or higher. It also emits light with an MR value of 3.00 or lower.

[0095] The third light emits light with a color rendering index (CRI) R9 less than 50. Alternatively, it emits light with a CRI R9 less than 30. Or, it emits light with a CRI R9 less than 10.

[0096] The third light emits light with a color rendering index (CRI) of less than 50. Alternatively, it emits light with a CRI of less than 30. Or, it emits light with a CRI of less than 10.

[0097] The third light is emitted by the light-emitting element 12 and the alkaline earth metal aluminate phosphor 14. The light-emitting element 12 is a nitride semiconductor with an emission peak in the range of 410 nm to 490 nm, and the alkaline earth metal aluminate phosphor 14 has a composition of Sr4Al 14 O 25 Eu represents the composition used as the main phosphor and has an emission peak near 495 nm.

[0098] Figure 8 This is a specific example of the emission spectrum of the third ray. In this specific example, the X-coordinate of the chromaticity diagram of the third ray is 0.146, the Y-coordinate is 0.237, and the MR value is 2.84. Furthermore, the color rendering index R9 is 0, and the color rendering index R15 is 0. For example... Figure 8 As shown, the third light corresponds to the circadian rhythm response and has a high MR value. Furthermore, although MR was specialized, the color rendering indices R9 and R15 were poor.

[0099] Next, the values ​​of the average color rendering index Ra, color rendering index R9, color rendering index R15, and MR when the correlated color temperature is changed by using the first light, the second light, and the third light in the light-emitting device 1 will be explained. Before this explanation, a conventional light-emitting device for comparison (hereinafter referred to as the comparative light-emitting device) will be described. This comparative light-emitting device is a light-emitting device used in conventional lighting devices, selected from a balance between luminous efficiency and average color rendering index Ra.

[0100] (Comparison of light-emitting devices)

[0101] The comparative light-emitting device consists of two individual light sources with correlated color temperatures of 2700K and 6500K, respectively. Furthermore, each individual light source emits light through a light-emitting element 12, which has a structure based on the formula Y3Al5O. 12 Ce represents a rare-earth aluminate phosphor with the composition of Lu3Al5O 12 The light-emitting element 12 is a nitride semiconductor having an emission peak in the range of 410 nm to 490 nm, and the light generated by a rare earth aluminate phosphor with a composition represented by Ce and a phosphor containing a silicon nitride phosphor with a composition represented by (Sr,Ca)AlSiN3:Eu.

[0102] In the comparative light-emitting device, within a correlated color temperature range of 2700K to 6500K, the average color rendering index (Ra) is 80 or higher, and the luminous efficacy is achieved at 180 lm / W to 200 lm / W. Furthermore, the maximum MR value is less than 1.00. Additionally, within the correlated color temperature range of 2700K to 6500K, the variation in MR value is less than 0.55. Details of the average color rendering index (Ra), color rendering index (R9), color rendering index (R15), and MR values ​​at the specified correlated color temperatures are shown in Table 1 below.

[0103] [Table 1]

[0104]

[0105] (First reference light-emitting device)

[0106] Next, for reference, we will describe a light-emitting device that uses a third light, which is specialized for MR, to replace the single-unit light with a correlated color temperature of 6500K used in the comparative light-emitting device. We will call this light-emitting device the first reference light-emitting device.

[0107] In the first reference light source, within a correlated color temperature range of 2700K to 6500K, the average color rendering index Ra is 80 or higher, and the maximum MR value exceeds 1.20. Furthermore, within the correlated color temperature range of 2700K to 6500K, the variation in MR value exceeds 0.80. That is, it can be seen that high MR is achieved using the third light source. On the other hand, the color rendering index R9 is below 50 at a correlated color temperature below 3500K, and the color rendering index R15 is below 75 at a correlated color temperature of 2700K. Details of the average color rendering index Ra, color rendering index R9, color rendering index R15, and MR values ​​at specified correlated color temperatures are shown in Table 2 below.

[0108] [Table 2]

[0109]

[0110] (Second reference light-emitting device)

[0111] Next, for reference, we will describe a light source that uses a first light with a good color rendering index (R9) to replace the single light with a correlated color temperature of 2700K used in the first reference light source (which is also used in the comparison light source). Let's call this light source the second reference light source.

[0112] In the second reference light source, within a correlated color temperature range of 2700K to 6500K, the average color rendering index Ra is 75 or higher, and the maximum MR value exceeds 1.20. Furthermore, within the correlated color temperature range of 2700K to 6500K, the variation in MR value exceeds 0.75. Similar to the first reference light source, high MR is achieved using the third light source. On the other hand, the color rendering index R9 is below 50 at a correlated color temperature of 6500K, and the color rendering index R15 is below 85 at a correlated color temperature of 4000K or higher. Details of the average color rendering index Ra, color rendering index R9, color rendering index R15, and MR values ​​at specified correlated color temperatures are shown in Table 3 below.

[0113] [Table 3]

[0114]

[0115] (First light-emitting device)

[0116] Next, the first light-emitting device, which is an example of light-emitting device 1, will be described. The first light-emitting device adopts... Figure 4 The first light shown Figure 5 The second light shown and Figure 8 The emitting device 1 for the third light shown.

[0117] In the first light-emitting device, within a correlated color temperature range of 2700K to 6500K, the average color rendering index (Ra) is 90 or higher, and the maximum MR value exceeds 1.10. Furthermore, within the correlated color temperature range of 2700K to 6500K, the variation in the MR value exceeds 0.60. Additionally, the color rendering index (R9) is 60 or higher, and 70 or higher within a correlated color temperature range of 3000K or higher, and 80 or higher within a correlated color temperature range of 3500K or higher. Furthermore, the color rendering index (R15) is 90 or higher.

[0118] The first light-emitting device not only achieves a higher MR than before through the third light, but also has a good color rendering index (CRI) value (R9). Furthermore, the CRI (R15) value is also excellent. Details of the average CRI (Ra), CRI (R9), CRI (R15), and MR values ​​at the specified correlated color temperature are shown in Table 4 below.

[0119] [Table 4]

[0120]

[0121] (Second light-emitting device)

[0122] Next, the second light-emitting device, which is an example of light-emitting device 1, will be described. The second light-emitting device employs... Figure 4 The first light shown Figure 6 The second light shown and Figure 8 The emitting device 1 for the third light shown.

[0123] In the second light-emitting device, within a correlated color temperature range of 2700K to 6500K, the average color rendering index (Ra) is 90 or higher, and the maximum MR value exceeds 1.00. Furthermore, within the correlated color temperature range of 2700K to 6500K, the variation in the MR value exceeds 0.55. Additionally, the color rendering index (R9) is 60 or higher, and 70 or higher within a correlated color temperature range of 3000K or higher, and 80 or higher within a correlated color temperature range of 3500K or higher. Furthermore, the color rendering index (R15) is 90 or higher.

[0124] The second light-emitting device not only achieves a higher MR than before through the third light, but also has a good color rendering index (CRI) value (R9). Furthermore, the CRI (R15) value is also excellent. Details of the average CRI (Ra), CRI (R9), CRI (R15), and MR values ​​at the specified correlated color temperature are shown in Table 5 below.

[0125] [Table 5]

[0126]

[0127] When considering the correlated color temperature range of 2700K to 6500K, the second light-emitting device tends to have a slightly lower MR value compared to the first light-emitting device, while its color rendering index (CRI) R9 value tends to be slightly higher. Additionally, its CRI R15 value also tends to be slightly higher. In other words, compared to the first light-emitting device, it can be said that this device places greater emphasis on either the CRI R9 or CRI R15 value.

[0128] (Third light-emitting device)

[0129] Next, the third light-emitting device, which is an example of light-emitting device 1, will be described. The third light-emitting device adopts... Figure 4 The first light shown Figure 7 The second light shown and Figure 8 The emitting device 1 for the third light shown.

[0130] In the third light-emitting device, within a correlated color temperature range of 2700K to 6500K, the average color rendering index (Ra) is 90 or higher, and the maximum MR value exceeds 1.10. Furthermore, within the correlated color temperature range of 2700K to 6500K, the variation in the MR value exceeds 0.65. Additionally, the color rendering index (R9) is 60 or higher, and 70 or higher within a correlated color temperature range of 3000K or higher. Furthermore, the color rendering index (R15) is 80 or higher, and 90 or higher within a correlated color temperature range of 5000K or lower.

[0131] The second light-emitting device not only achieves a higher MR than before through the third light, but also has a good color rendering index (CRI) value (R9). Furthermore, the CRI (R15) value is also excellent. Details of the average CRI (Ra), CRI (R9), CRI (R15), and MR values ​​at the specified correlated color temperature are shown in Table 6 below.

[0132] [Table 6]

[0133]

[0134] When considering the correlated color temperature range of 2700K to 6500K, the third light-emitting device tends to have a slightly higher MR value compared to the first light-emitting device, while its color rendering index (R9) tends to be slightly lower. Additionally, its color rendering index (R15) also tends to be slightly lower. In other words, compared to the first light-emitting device, it can be said to be a light-emitting device that places greater emphasis on MR values.

[0135] Thus, the first, second, and third light-emitting devices all achieve higher MR values ​​than before within a correlated color temperature range of 2700K to 6500K, and also achieve a larger MR variation range. Similarly, the first and second reference light-emitting devices achieve even higher maximum values ​​and a larger variation range than the first, second, and third light-emitting devices. In other words, from the viewpoint of MR, these light-emitting devices can be expected to achieve superior performance than before.

[0136] Furthermore, the first, second, and third light-emitting devices exhibit good or excellent characteristics even within a wide range of correlated color temperatures, even at values ​​of the color rendering index R9. In this respect, it can be said that the first, second, and third light-emitting devices are superior to the first and second reference light-emitting devices.

[0137] Furthermore, the correlated color temperature of the second light is within the range of 3500K to 5500K. The closer the correlated color temperature of the second light is to the lower limit (3500K), the higher the MR value of the light-emitting device 1 at a correlated color temperature of 6500K. In addition, the closer the correlated color temperature of the second light is to the upper limit (5500K), the higher the overall color rendering index (R9) value.

[0138] That is, by adjusting the correlated color temperature of the second light, the balance between the MR value and the color rendering index R9 can be appropriately adjusted. The same applies to the balance between the MR value and the color rendering index R15.

[0139] Furthermore, the maximum correlated color temperature achieved in the light-emitting device 1 is not limited to 6500K. It can exceed 6500K or be lower than 6500K, but higher than the correlated color temperature of the second light. Additionally, the correlated color temperature of the first light can be lower than the minimum correlated color temperature achieved in the light-emitting device 1. When the first light among the multiple individual lights provided in the light-emitting device 1 has the lowest correlated color temperature, the correlated color temperature of the first light is lower than the minimum correlated color temperature achieved in the light-emitting device 1.

[0140] The light-emitting device 1 achieves the following: in light with a correlated color temperature of 6500K based on at least two of the first, second, and third lights, the color rendering index (CRI) R9 is 50 or higher, and the relative color temperature (MR) is 1.0 or higher. Furthermore, the CRI R15 is 85 or higher. Moreover, in light with a correlated color temperature of 2700K based on at least one of the first, second, and third lights, the CRI R9 is 50 or higher.

[0141] In addition, the light-emitting device 1 achieves a color rendering index R9 value of 70 or higher in light with a correlated color temperature of 6500K based on two or more lights, including at least the third light, of the first light, the second light, and the third light.

[0142] Furthermore, the light-emitting device 1 achieves an MR value of 1.05 or higher in light with a correlated color temperature of 6500K based on at least two or more lights, including the third light, among the first light, the second light, and the third light.

[0143] In addition, the light-emitting device 1 achieves the following: in light with a correlated color temperature of 6500K based on two or more lights, including at least the third light, of the first light, the second light, and the third light, the color rendering index R9 is 80 or higher, and the MR is 1.10 or higher.

[0144] In addition, the light-emitting device 1 achieves the following: in light with a correlated color temperature of 6500K based on two or more lights, including at least the third light, of the first light, the second light, and the third light, the color rendering index R9 is 90 or higher, and the MR is 1.05 or higher.

[0145] In addition, the light-emitting device 1 achieves the following: in light with a correlated color temperature of 6500K based on two or more lights, including at least the third light, of the first light, the second light, and the third light, the color rendering index R9 is 70 or higher, and the MR is 1.15 or higher.

[0146] Furthermore, within a correlated color temperature range of 2700K to 6500K, the MR value of the light-emitting device 1 varies by 0.55 or more, and the color rendering index (R9) is 65 or more. Additionally, the MR value increases monotonically with increasing correlated color temperature. However, while it may increase monotonically, it can also increase nonlinearly.

[0147] Furthermore, the light-emitting device 1 has an average color rendering index (Ra) of 80 or higher within a correlated color temperature range of 2700K to 6500K. Additionally, within the same correlated color temperature range, the color rendering index (R15) is 85 or higher. Furthermore, the correlated color temperature of the first light is 1500K to 2700K.

[0148] Furthermore, the color rendering index (CRI) of the light-emitting device 1 is 75 or higher within a correlated color temperature range of 3500K to 6500K. Additionally, the CRI of the light-emitting device 1 is 80 or higher within a correlated color temperature range of 3500K to 6500K. Furthermore, the CRI of the light-emitting device 1 is 85 or higher within a correlated color temperature range of 3500K to 6500K.

[0149] (Color control system)

[0150] Next, the color control using the light-emitting device 1 will be explained. Here, we envision a scenario where multiple light-emitting devices 1 are installed as lighting devices in a room inside a building. However, the light-emitting device 1 as a lighting device is not limited to this method of provision.

[0151] As a light-emitting device 1, if the color temperature is within the range where color adjustment is possible, the information processing device 2 that controls the illumination of the light-emitting device 1 can adjust the color within the desired range. In other words, as a light-emitting device 1, the correlated color temperature of the illumination can also be adjusted within a range smaller than the adjustable range.

[0152] The color control system has multiple light-emitting devices 1 and information processing devices 2. In addition, the multiple light-emitting devices 1 and information processing devices 2 can be communicatively connected. The information processing device 2 sends control signals to the light-emitting devices 1 via a communication unit to control the illumination of the light-emitting devices 1. Figure 9 This is a structural diagram illustrating an example of the structure of a color-matching control system. Additionally, the light-emitting device 1 can be a single unit.

[0153] Information processing device 2 can be composed of computers, server devices, etc. Figure 10This diagram illustrates an example of the hardware structure of the information processing device 2. In the information processing device 2, the CPU 70, ROM 71, RAM 72, storage 73, graphics I / F 74, data I / F 75, communication I / F 76, and input device 77 are connected to a bus.

[0154] Storage 73 is a storage medium capable of non-volatile data storage. For example, a hard disk drive, flash memory, etc., can be used. CPU 70 is a processor that executes processing according to a program stored in ROM 71 and storage 73, using RAM 72 as its working memory. Graphics I / F 74 is an interface that converts generated display control signals into signals that the device can display and outputs them.

[0155] Data I / F 75 is an interface for receiving data from an external source. For example, an interface based on USB can be used. Communication I / F 76 is an interface for communicating with a network using a specified protocol. Input device 77 accepts user input and outputs specified control signals.

[0156] In the color control system, the information processing unit 2 has a dimming determination unit 3 that determines the control command for adjusting the illumination light of the light-emitting device 1. When controlling the correlated color temperature within a range from a first value to a second value, the dimming determination unit 3 determines the emission ratio of the multiple individual light sources of the light-emitting device 1.

[0157] In addition, the information processing device 2 has a transmitting unit 4 that transmits control commands instructing the light-emitting device 1 to emit light at a determined light emission ratio. The light-emitting device 1 emits light based on the control commands received from the information processing device 2.

[0158] Furthermore, to achieve color tuning that matches the circadian rhythm, it is preferable to perform color tuning that corresponds to changes in the color temperature of sunlight. However, it is also possible to avoid precisely matching changes in sunlight. For example, during the day, from 6:00 AM to 10:00 AM, the correlated color temperature is linearly increased from 4000K to 6500K, reaching 6500K at 10:00 AM. Then, it is maintained at 6500K until 2:30 PM, and from 2:30 PM to 5:00 PM, the correlated color temperature is linearly decreased from 6500K to 4000K. Furthermore, from 5:00 PM to 7:00 PM, the correlated color temperature is decreased from 4000K to 2700K.

[0159] As explained above, the light-emitting device 1 according to the embodiment can emit emitted light that maintains a high color rendering index R9, i.e., color rendering in the red region. Therefore, emitted light with excellent red reproducibility can be used for lighting or displays, thereby improving the user's visibility.

[0160] Furthermore, since it is a light-emitting device 1 with an excellent melatonin illuminance ratio, the user's circadian rhythm can also be taken into account. Even in color control where the value of the melatonin illuminance ratio increases or decreases, the change in the color rendering index R9 can be suppressed and maintained at a good value. Therefore, a light-emitting device that takes into account both circadian rhythm and color rendering can be realized.

[0161] The embodiments of the present invention have been described above, but the technical concept of the present invention is not limited to the specific embodiments described. Furthermore, the present invention is applicable even if it is not necessary to fully possess all the constituent elements disclosed in each embodiment. In the field of art, as long as there is freedom in design, the present invention is applicable even if only a portion of the constituent elements disclosed in the embodiments is not described in the claims; this specification discloses the invention on the premise of including such content.

[0162] Industrial availability

[0163] The light-emitting device or color-matching control system described in the embodiments can be used in the fields of lighting or displays. Additionally, it can be used in electronic billboards or electronic advertisements. Furthermore, it can be utilized in information processing terminals that display augmented reality, virtual 3D spaces, etc.

Claims

1. A light-emitting device, wherein, The light-emitting device includes: One or more light-emitting elements; and It includes at least several phosphors such as rare-earth aluminate phosphors, rare-earth aluminum garnet phosphors, and fluoride phosphors with emission peaks around 630 nm. The light-emitting device emits the following light: The light containing the fluorescence generated by the fluoride phosphor, having a first color temperature of 1500K or higher and 3500K or lower, and having a color rendering index (R9) of 50 or higher; The light that contains the fluorescence generated by the fluoride phosphor and is a second color temperature with a correlated color temperature of 3500K or higher and 5500K or lower and higher than the first color temperature, and has a color rendering index R9 value of 50 or higher. The fluorescence produced by the third monomer light and the fluoride phosphor has a correlated color temperature of 6500K, a color rendering index R9 of 50 or higher, and a melatonin illuminance ratio of 1.0 or higher, wherein the X and Y coordinates of the third monomer light in the chromaticity diagram of the CIE 1931 colorimetric system are smaller than the X and Y coordinates of the blackbody radiation locus at a color temperature of 5500K, and the melatonin illuminance ratio is 1.8 or higher.

2. The light-emitting device according to claim 1, wherein, The rare earth aluminate phosphor has the following properties: Y3(Al,Ga)5O 12 Ce represents the composition of the phosphor. The rare-earth aluminum garnet phosphor has the formula Lu3Al5O 12 Ce represents the composition of the phosphor. The fluoride phosphor has the formula K2SiF6:Mn 4+ The fluorescent material represents the composition of the phosphor.

3. The light-emitting device according to claim 1 or 2, wherein, In the light with a correlated color temperature of 6500K, the color rendering index R15 is 85 or higher.

4. The light-emitting device according to any one of claims 1 to 3, wherein, In light with a correlated color temperature between 3500K and 5500K, the color rendering index (R9) is 60 or higher.

5. The light-emitting device according to any one of claims 1 to 4, wherein, In light with a correlated color temperature between 2700K and 6500K, the average color rendering index Ra is above 80.

6. The light-emitting device according to any one of claims 1 to 5, wherein, In light with a correlated color temperature above 2700K and below 6500K, the melatonin illuminance ratio increases monotonically.

7. The light-emitting device according to any one of claims 1 to 6, wherein, The color rendering index R9 of the single light is less than 30.

8. The light-emitting device according to any one of claims 1 to 7, wherein, In light with a correlated color temperature between 2700K and 6500K, the average color rendering index (R9) is above 50.

9. The light-emitting device according to any one of claims 1 to 7, The light-emitting device can emit at least two or more individual light sources, including the first individual light, the second individual light, and the third individual light, of which at least the third individual light is included. The first single-element light is light generated by one or more phosphors, including one or more light-emitting elements and one or more phosphors containing one or more light-emitting elements and a fluoride phosphor having an emission peak at least around 630 nm, and is light with a first color temperature of 1500 K or more and 3500 K or less, and is light with a color rendering index R9 value of 50 or more. The second single-element light is light produced by one or more phosphors, including the one or more light-emitting elements and the fluoride phosphor having an emission peak at least around 630 nm, and is light with a correlated color temperature of 3500 K or higher and 5500 K or lower than the first color temperature, and is light with a color rendering index R9 value of 50 or higher. The third single-unit light is light generated by one or more phosphors, including the one or more light-emitting elements and at least one phosphor that is different from the one or more phosphors included in the first single-unit light. Light with a correlated color temperature of 6500K is a mixed light obtained by mixing two or more individual lights, including at least the third individual light, among the first, second, and third individual lights.

10. The light-emitting device according to claim 9, At least in light with a correlated color temperature between 3500K and 5000K, the color rendering index (R9) is 50 or higher.

11. The light-emitting device according to claim 9 or 10, The first single-element light is light containing the fluorescence generated by the rare-earth aluminate phosphor and the fluorescence generated by the fluoride phosphor. The second single-element light is light containing the fluorescence generated by the rare-earth aluminum garnet phosphor and the fluorescence generated by the fluoride phosphor.

12. The light-emitting device according to claim 9 or 10, The first single-element light is light containing the fluorescence generated by the rare-earth aluminate phosphor and the fluorescence generated by the fluoride phosphor. The second monomeric light is light containing the fluorescence generated by the rare earth aluminate phosphor and the fluorescence generated by the fluoride phosphor.

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