Light emitting device and lighting device including the light emitting device

Abstract

Provided are a light-emitting element and a lighting device including the light-emitting element, which can simulate sunlight and have the effect of faithfully reproducing the color of an actual object. [Solution] A light-emitting element 10 that emits white light comprises a bottom plate 101, light-emitting diodes 102, 103, 104, and three fluorescent layers 105. The light-emitting diodes 102, 103, 104 can emit blue light having a wavelength range of 410nm to 450nm, blue light having a wavelength range of 450nm to 470nm, and blue light having a wavelength range of 460nm to 490nm, respectively. The three fluorescent layers 105 cover the surfaces of the light-emitting diodes 102, 103, 104, respectively. When the three fluorescent layers 105 absorb the blue light, they are excited by the blue light and each fluorescent layer 105 emits a predetermined light. When the predetermined lights emitted by the three fluorescent layers 105 are mixed, the light-emitting element 10 emits a predetermined white light.

Description

[Technical field]

[0001] The present invention relates to a light-emitting element and a lighting device, and more particularly to a light-emitting element capable of emitting white light, and a lighting device including the light-emitting element and capable of adjusting the color and brightness of illumination light. [Background technology]

[0002] An example of a conventional light-emitting element that emits white light is a light-emitting diode module for plant growth described in Patent Document 1. Here, Fig. 1 is a diagram showing the spectrum of white light emitted by the conventional light-emitting element, and Fig. 2 is a chromaticity diagram showing the chromaticity coordinates of two light-emitting elements in the conventional lighting device.

[0003] The above-mentioned white light has a continuous spectrum, a wavelength range of 380 nm to 780 nm, and a color tone that can be modulated to reddish white light, yellowish white light, or bluish white light depending on the color temperature.

[0004] A conventional lighting device includes a first light-emitting element with a low color temperature and a second light-emitting element with a high color temperature. As shown in Fig. 2, the chromaticity coordinates of the first light-emitting element are represented by coordinate 91, and the chromaticity coordinates of the second light-emitting element are represented by coordinate 92. By adjusting the brightness of the first light-emitting element or the second light-emitting element, the color temperature of the mixed light moves on the straight line connected by coordinate 91 and coordinate 92 (i.e., the dashed line shown in Fig. 2), so that the conventional lighting device can emit light with a predetermined color temperature. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Taiwan Patent Application Publication No. 201843844 Summary of the Invention [Problem to be solved by the invention]

[0006] However, as shown by the arrow in Figure 1, the white light emitted by conventional light-emitting elements lacks blue-green, and the color rendering indexes R9 and R12 are usually less than 90. In this way, the white light cannot simulate sunlight.

[0007] In addition, in the above-mentioned lighting device, the line connected by the chromaticity coordinates of the first light-emitting element and the chromaticity coordinates of the second light-emitting element has only two end points on the blackbody radiation locus (i.e., the curve shown in Figure 2) that represents a light source color close to sunlight or white light, and the other line segments are far from the blackbody radiation locus, especially the intermediate line segment. In other words, the illumination light mixed by such means is clearly different from the color temperature of actual sunlight.

[0008] SUMMARY OF THE PRESENT DISCLOSURE In view of the above problems, the present invention aims to provide a light-emitting device that can solve the above-mentioned drawbacks, and a lighting device including the light-emitting device. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides the following light-emitting device.

[0010] That is, a light-emitting element capable of emitting white light, The light emitting diode includes a bottom plate, a first light emitting diode, a second light emitting diode, a third light emitting diode, and three phosphor layers; the first light emitting diode, the second light emitting diode, and the third light emitting diode are all disposed on the bottom plate; The first light emitting diode may emit a first blue light having a wavelength range of 410 nm to 450 nm; The second light emitting diode may emit a second blue light having a wavelength range of 450 nm to 470 nm; The third light emitting diode may emit a third blue light having a wavelength range of 460 nm to 490 nm; the three fluorescent layers cover the surfaces of the first light emitting diode, the second light emitting diode, and the third light emitting diode, respectively, corresponding to the first light emitting diode, the second light emitting diode, and the third light emitting diode; The present invention provides a light-emitting element, characterized in that when the three fluorescent layers absorb the first blue light, the second blue light, and the third blue light, they are excited by the first blue light, the second blue light, and the third blue light, and each of the fluorescent layers emits a predetermined light, and when the predetermined lights emitted by the three fluorescent layers are mixed, the light-emitting element can emit a predetermined white light.

[0011] The light source unit includes a light source unit and a control unit electrically connected to the light source unit. The light source unit includes at least three of the light emitting elements described above, In the CIE chromaticity diagram, the chromaticity coordinates of the three light-emitting elements are defined as a first coordinate, a second coordinate, and a third coordinate, respectively; The three light-emitting elements all have different correlated color temperatures, a straight line connecting the first coordinate, the second coordinate, and the third coordinate intersects with a blackbody locus in the CIE chromaticity diagram and surrounds a first chromaticity range, a portion of the blackbody locus being within the first chromaticity range; The chromaticity coordinates in the CIE chromaticity diagram of the light mixed by the three light-emitting elements are defined as mixed coordinates; The present invention provides a lighting device, characterized in that, when the power is turned on, the control unit is configured to supply power to the light source unit and control the brightness change of each of the light-emitting elements to move the mixed coordinate within the first chromaticity range. Effect of the Invention

[0012] According to the light-emitting device of the present invention, each phosphor layer emits a predetermined light in response to absorbing the blue light emitted by the corresponding light-emitting diode, and when the lights emitted by the phosphor layers are mixed, the light-emitting device can emit a predetermined white light, which has a sufficient blue-green color to simulate sunlight. In addition, according to the lighting device of the present invention, the control unit controls the brightness change of each light-emitting element so that the mixing coordinate associated with the light mixed by those light-emitting elements is on or close to the blackbody radiation locus in the first chromaticity range, so that the mixed light becomes light similar to sunlight, and has the effect of faithfully reproducing the color of an actual object. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing the spectrum of white light emitted by a conventional light-emitting element. [Diagram 2] 1 is a chromaticity diagram showing the chromaticity coordinates of two light-emitting elements in a conventional lighting device. [Diagram 3] 1 is a block diagram showing the configuration of a lighting device according to a first embodiment of the present invention; [Figure 4] 3 is a schematic diagram showing an arrangement state of light source units on a substrate of the lighting device according to the first embodiment. FIG. [Diagram 5] 1 is a schematic diagram showing the configuration of a light emitting device according to an embodiment of the present invention; [Figure 6] FIG. 2 is a diagram showing the spectrum of white light emitted by the light-emitting element according to the embodiment. [Figure 7] FIG. 2 is a diagram showing changes in correlated color temperature at different environmental temperatures of white light emitted by the light-emitting device according to the embodiment and white light emitted by a conventional light-emitting device. [Figure 8] FIG. 11 is a diagram showing changes in color rendering index R9 at different environmental temperatures for white light emitted by the light-emitting device according to the embodiment and white light emitted by a conventional light-emitting device. [Figure 9]FIG. 11 is a diagram showing changes in color rendering index R12 at different environmental temperatures for white light emitted by the light-emitting device according to the embodiment and white light emitted by a conventional light-emitting device. [Figure 10] 3 is a chromaticity diagram showing chromaticity coordinates associated with a light source unit in the lighting device according to the first embodiment. FIG. [Figure 11] 5 is a block diagram showing the configuration of a lighting device according to a second embodiment of the present invention; FIG. [Figure 12] FIG. 11 is a chromaticity diagram showing chromaticity coordinates associated with a light source unit in the lighting device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The lighting device according to the present invention is, for example, a lighting fixture such as a photography light, a ceiling recessed light, a lamp, or a grow light.

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a light emitting device according to the present invention and a lighting device including the light emitting device will be described with reference to the drawings.

[0016] The configuration of the lighting device according to the first embodiment of the present invention will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a block diagram showing the configuration of the lighting device according to the first embodiment of the present invention, and Fig. 4 is a schematic diagram showing the arrangement of light source units 1 on a substrate 3 of the lighting device according to the first embodiment.

[0017] As shown in Figures 3 and 4, the lighting device of the first embodiment of the present invention comprises a light source unit 1, a control unit 2 that can control the light source unit 1, and a substrate 3 on which the light source unit 1 is arranged.

[0018] The light source unit 1 includes at least three light emitting elements 10, which will be described later. In this embodiment, the light source unit 1 includes a first light source 11, a second light source 12, and a third light source 13, as shown in Fig. 3. The first light source 11, the second light source 12, and the third light source 13 are all configured to emit white light. The first light source 11, the second light source 12, and the third light source 13 all have different correlated color temperatures.

[0019] As shown in Fig. 4, each of the first light source 11, the second light source 12, and the third light source 13 includes a plurality of light emitting elements 10. In addition, on the substrate 3, the plurality of light emitting elements 10 in the first light source 11, the plurality of light emitting elements 10 in the second light source 12, and the plurality of light emitting elements 10 in the third light source 13 are arranged in a staggered circular arrangement. This arrangement can effectively realize uniformity of the mixed light. Of course, the arrangement is not limited to the arrangement shown in Fig. 4, and the light emitting elements 10 may be arranged in other arrangements in other embodiments.

[0020] In this embodiment, the first light source 11, the second light source 12, and the third light source 13 each include a plurality of light emitting elements 10, but in other embodiments, the first light source 11, the second light source 12, and the third light source 13 each may include one light emitting element 10. That is, the number of light emitting elements 10 in each light source may be changed according to needs. In addition, when the first light source 11, the second light source 12, and the third light source 13 each include one light emitting element 10, the three light emitting elements 10 each have different correlated color temperatures.

[0021] The configuration of the light-emitting device 10 according to an embodiment of the present invention will be described with reference to Fig. 5 to Fig. 9. Fig. 5 is a schematic diagram showing the configuration of the light-emitting device 10 according to an embodiment of the present invention, Fig. 6 is a diagram showing the spectrum of white light emitted by the light-emitting device 10 according to the embodiment, Fig. 7 is a diagram showing the change in correlated color temperature at different environmental temperatures of the white light emitted by the light-emitting device 10 according to the embodiment and the white light emitted by a conventional light-emitting device, Fig. 8 is a diagram showing the change in color rendering index R9 at different environmental temperatures of the white light emitted by the light-emitting device 10 according to the embodiment and the white light emitted by a conventional light-emitting device, and Fig. 9 is a diagram showing the change in color rendering index R12 at different environmental temperatures of the white light emitted by the light-emitting device 10 according to the embodiment and the white light emitted by a conventional light-emitting device.

[0022] The light-emitting element 10 according to one embodiment of the present invention is capable of emitting white light, and includes a base plate 101, a first light-emitting diode 102, a second light-emitting diode 103, a third light-emitting diode 104, and three phosphor layers 105, as shown in FIG.

[0023] Here, the first light emitting diode 102, the second light emitting diode 103, and the third light emitting diode 104 are all disposed on the bottom plate 101, as shown in Fig. 5. In this embodiment, the first light emitting diode 102, the second light emitting diode 103, and the third light emitting diode 104 are all light emitting diode packages.

[0024] In this embodiment, when a voltage is applied, the first light-emitting diode 102 can emit a first blue light having a wavelength range of 410 nm to 450 nm, the second light-emitting diode 103 can emit a second blue light having a wavelength range of 450 nm to 470 nm, and the third light-emitting diode 104 can emit a third blue light having a wavelength range of 460 nm to 490 nm.

[0025] The color temperatures of the first blue light, the second blue light, and the third blue light are all within the range of 2700K to 7500K.

[0026] As shown in FIG. 5, the three fluorescent layers 105 correspond to the first light-emitting diode 102, the second light-emitting diode 103, and the third light-emitting diode 104, respectively covering the surfaces of the first light-emitting diode 102, the second light-emitting diode 103, and the third light-emitting diode 104.

[0027] In addition, when the three fluorescent layers 105 absorb the first blue light, the second blue light, and the third blue light, they are excited by the first blue light, the second blue light, and the third blue light, and each fluorescent layer 105 emits a predetermined light. When the lights emitted by the three fluorescent layers 105 are mixed, the light-emitting element 10 of this embodiment can emit a predetermined white light.

[0028] Specifically, the phosphor layers 105 contain, for example, phosphor powders of different colors. In addition, the type and composition ratio of the phosphor powder in each phosphor layer 105 can be adjusted according to needs. In this way, as shown in FIG. 6, the white light mixed with the light emitted from the three phosphor layers 105 has a sufficient amount of blue-green color, so that it can simulate sunlight.

[0029] With the above-mentioned configuration, the white light emitted by the light emitting device 10 of the embodiment has a very high color rendering index (CRI), which is a quantitative measurement of the ability of a light source to faithfully reproduce the color of an actual object. Specifically, the color rendering indexes R1 to R15 of the white light are greater than 90.

[0030] In particular, when the white light emitted by the light-emitting element 10 of this embodiment has a correlated color temperature of 5886 K, the color rendering indexes R9 and R12 are greater than 93. This makes it possible to improve color reproduction. Here, the measured values ​​of the color rendering indexes Ra and R1 to R15 of the white light emitted by the light-emitting element 10 of this embodiment when the correlated color temperature is 5886 K are shown in Table 1 below.

[0031] [Table 1] Hereinafter, with reference to FIG. 7, a description will be given of changes in correlated color temperature (K) at different environmental temperatures (°C) for white light emitted by the light-emitting device 10 according to the embodiment and white light emitted by a conventional light-emitting device.

[0032] Here, the change in correlated color temperature of the white light emitted by the light-emitting element 10 of the embodiment is represented by a solid line in Fig. 7, while the change in correlated color temperature of the white light emitted by the conventional light-emitting element is represented by a dashed line in Fig. 7. As shown in Fig. 7, compared with the conventional light-emitting element, the correlated color temperature of the light-emitting element 10 of the embodiment is less affected by the environmental temperature.

[0033] Hereinafter, with reference to FIG. 8, a description will be given of changes in color rendering index R9 at different environmental temperatures for white light emitted by the light-emitting device 10 according to the embodiment and white light emitted by a conventional light-emitting device.

[0034] Here, the change in color rendering index R9 for the white light emitted by the light-emitting element 10 of this embodiment is represented by a solid line in FIG. 8, while the change in color rendering index R9 for the white light emitted by a conventional light-emitting element is represented by a dashed line in FIG.

[0035] 8, when the environmental temperature is within a range of 30° C. to 90° C., the white light emitted by the light-emitting device 10 of the embodiment has a color rendering index R9 greater than 91. Compared with the conventional light-emitting device, the color rendering index R9 of the light-emitting device 10 of the embodiment is less affected by the environmental temperature.

[0036] Hereinafter, with reference to FIG. 9, a description will be given of changes in color rendering index R12 at different environmental temperatures for white light emitted by the light-emitting device 10 according to the embodiment and white light emitted by a conventional light-emitting device.

[0037] Here, the change in color rendering index R12 for the white light emitted by the light-emitting element 10 of this embodiment is represented by a solid line in Figure 9, while the change in color rendering index R12 for the white light emitted by a conventional light-emitting element is represented by a dashed line in Figure 9.

[0038] 9, when the environmental temperature is within a range of 30° C. to 90° C., the white light emitted by the light-emitting element 10 of the embodiment has a color rendering index R12 that is all greater than 91. Compared with the conventional light-emitting element, the color rendering index R12 of the light-emitting element 10 of the embodiment is much greater.

[0039] Chromaticity coordinates associated with the light source unit 1 in the lighting device according to the first embodiment will be described with reference to Fig. 10. Here, Fig. 10 is a chromaticity diagram illustrating chromaticity coordinates associated with the light source unit 1 in the lighting device according to the first embodiment.

[0040] 10, in the CIE chromaticity diagram, the chromaticity coordinates of the light-emitting element 10 in the first light source group 11 are defined as first coordinates 112, the chromaticity coordinates of the light-emitting element 10 in the second light source group 12 are defined as second coordinates 122, and the chromaticity coordinates of the light-emitting element 10 in the third light source group 13 are defined as third coordinates 132. In this embodiment, the above-mentioned CIE chromaticity diagram is the CIE 1976 chromaticity diagram.

[0041] Here, first light source group 11, second light source group 12, and third light source group 13 have different correlated color temperatures, and therefore first coordinate 112, second coordinate 122, and third coordinate 132 represent different correlated color temperatures.

[0042] As shown in Figure 10, the straight lines connecting the first coordinate 112, the second coordinate 122, and the third coordinate 132 (i.e., the three straight lines forming a triangle as shown in Figure 10) intersect with the blackbody radiation locus 41 in the CIE chromaticity diagram.

[0043] At least two of the first coordinate 112, the second coordinate 122, and the third coordinate 132 are not on the blackbody radiation locus 41. In this embodiment, an example will be described in which none of the first coordinate 112, the second coordinate 122, and the third coordinate 132 are on the blackbody radiation locus 41, but the object of the present invention can be achieved even if any one of the first coordinate 112 and the third coordinate 132 is on the blackbody radiation locus 41.

[0044] The correlated color temperature of the first light source group 11 (i.e., the correlated color temperature of the light-emitting element 10 corresponding to the first coordinate 112) is in the range of 1800K to 2600K, the correlated color temperature of the second light source group 12 (i.e., the correlated color temperature of the light-emitting element 10 corresponding to the second coordinate 122) is in the range of 2600K to 4500K, and the correlated color temperature of the third light source group 13 (i.e., the correlated color temperature of the light-emitting element 10 corresponding to the third coordinate 132) is in the range of 6500K to 10000K.

[0045] In this embodiment, as shown in FIG. 10, the correlated color temperature of the light-emitting element 10 corresponding to the first coordinate 112 is 1800K, the correlated color temperature of the light-emitting element 10 corresponding to the second coordinate 122 is 3500K, and the correlated color temperature of the light-emitting element 10 corresponding to the third coordinate 132 is 10000K.

[0046] Here, a line connecting the first coordinate 112, the second coordinate 122, and the third coordinate 132 intersects with the blackbody radiation locus 41 at two intersection points 18. Of the two intersection points 18, one point (i.e., the intersection point 18 closer to the first coordinate 112) represents a color temperature of 1800K or lower, while the other point (i.e., the intersection point 18 closer to the third coordinate 132) represents a color temperature of 10000K or higher.

[0047] In this embodiment, as shown in Fig. 10, the straight line connecting the first coordinate 112 and the third coordinate 132 intersects with the blackbody radiation locus 41 at two intersection points 18. Of course, this is not limited thereto, and in other embodiments, the intersection points 18 may be on any two sides of a triangle as shown in Fig. 10.

[0048] 10, a straight line connecting the first coordinate 112, the second coordinate 122, and the third coordinate 132 surrounds the first chromaticity range 42, and a portion of the blackbody radiation locus 41 is within the first chromaticity range 42. The first chromaticity range 42 is a dimming range. In other words, a portion of the blackbody radiation locus 41 that is within the first chromaticity range 42 is the dimming target.

[0049] The chromaticity coordinates in the CIE chromaticity diagram of the light mixed by the first light source group 11, the second light source group 12, and the third light source group 13 (i.e., three light-emitting elements 10 with different correlated color temperatures) are defined as mixed coordinates 17, as shown in Figure 10.

[0050] 3, the control unit 2 is electrically connected to the light source unit 1. When the power is turned on, the control unit 2 supplies power (i.e., output current) to the light source unit 1 to control the brightness changes of the first light source group 11, the second light source group 12, and the third light source group 13 (i.e., each light-emitting element 10) to move the mixed coordinate 17 within the first chromaticity range 42.

[0051] The control unit 2 also includes a storage device such as a microprocessor or memory, and a current driver, and can output drive currents to the first light source group 11, the second light source group 12, and the third light source group 13 according to a predetermined algorithm to control their brightness.

[0052] In this way, the mixed coordinate 17 can move within the first chromaticity range 42 based on the respective brightnesses of the first light source group 11, the second light source group 12, and the third light source group 13. This makes it possible to mix light having different correlated color temperatures and adjust the dimming of the mixed light. In this embodiment, the color temperature of the mixed light is within the range of 1800K to 10000K.

[0053] In this embodiment, the above algorithm can calculate the power ratios of the first light source group 11, the second light source group 12, and the third light source group 13 corresponding to a predetermined color temperature (e.g., 3000K) related to the mixed coordinate 17 based on the preset spectra of the first light source group 11, the second light source group 12, and the third light source group 13. For example, the power ratio of the first light source group 11 is 35%, the power ratio of the second light source group 12 is 63%, and the power ratio of the third light source group 13 is 3%. Then, a function or a table is created based on the calculated values, and the function or table is stored in the control unit 2 and can be used as an algorithm.

[0054] For example, if the light source unit 1 uses 300 W of power, the 300 W of power can be distributed to the first light source group 11 (35%), the second light source group 12 (63%), and the third light source group 13 (3%) according to the power ratios described above.

[0055] The numerical values ​​of the power ratios between the first coordinate 112, the second coordinate 122, and the third coordinate 132 at each color temperature associated with the mixed coordinate 17 according to the algorithm of this embodiment are shown in Table 2 below.

[0056] As shown in Table 2, the Duv value (i.e., the color deviation of the color temperature from the blackbody radiation locus 41) measured by the blending coordinate 17 of each color temperature is in the range of −0.0005 to 0.0005, and the color rendering index (CRI) is greater than 95.

[0057] In this way, the mixing coordinate 17 associated with the light mixed by the first light source group 11, the second light source group 12, and the third light source group 13 is on the blackbody radiation locus 41 or close to the blackbody radiation locus 41. Therefore, the light mixed by the lighting device of this embodiment resembles sunlight, and an effect of faithfully reproducing the color of an actual object can be obtained.

[0058] [Table 2] The configuration of a lighting device according to a second embodiment of the present invention will be described with reference to Fig. 11 and Fig. 12. Here, Fig. 11 is a block diagram showing the configuration of a lighting device according to the second embodiment of the present invention, and Fig. 12 is a chromaticity diagram showing chromaticity coordinates associated with a light source unit 1 in the lighting device according to the second embodiment.

[0059] The second embodiment of the lighting device according to the present invention has many components in common with the first embodiment, so only the differences from the first embodiment will be described below.

[0060] 11, the light source unit 1 of the illumination device of this embodiment not only includes a first light source group 11, a second light source group 12, and a third light source group 13 that emit white light, but also includes a fourth light source group 14 that emits red light, a fifth light source group 15 that emits green light, and a sixth light source group 16 that emits blue light. That is, the fourth light source group 14, the fifth light source group 15, and the sixth light source group 16 can all emit monochromatic light. The monochromatic light has a full width at half maximum (FWHM) in the range of 5 nm to 30 nm.

[0061] Here, the fourth light source group 14 includes a plurality of red light emitting diodes, the fifth light source group 15 includes a plurality of green light emitting diodes, and the sixth light source group 16 includes a plurality of blue light emitting diodes.

[0062] As in the first embodiment, in this embodiment, when the power is turned on, the control unit 2 can supply power (i.e., output current) to the light source unit 1 to control the brightness changes of the fourth light source group 14, the fifth light source group 15, and the sixth light source group 16.

[0063] As shown in FIG. 12, in the CIE chromaticity diagram, the chromaticity coordinates of the fourth light source group 14 are defined as the fourth coordinate 141, the chromaticity coordinates of the fifth light source group 15 are defined as the fifth coordinate 151, and the chromaticity coordinates of the sixth light source group 16 are defined as the sixth coordinate 161.

[0064] As shown in Figure 12, a straight line connecting the fourth coordinate 141, the fifth coordinate 151, and the sixth coordinate 161 surrounds the second chromaticity range 43, and the area of ​​the second chromaticity range 43 is larger than the area of ​​the first chromaticity range 42.

[0065] In practical application, first, the control unit 2 adjusts the ratio of the power of each of the first light source group 11, the second light source group 12, and the third light source group 13, so that the light source unit 1 can provide light whose mixed coordinate 17 is close to the blackbody radiation locus 41 as basic light. Then, according to needs, the control unit 2 adjusts the ratio of the power of each of the fourth light source group 14, the fifth light source group 15, and the sixth light source group 16 to adjust the dimming and color of the basic light. With this configuration, the color of the mixed basic light can be adjusted. Therefore, the lighting device of the second embodiment can be used according to various applications (for example, photography, etc.).

[0066] For example, when the lighting device of this embodiment is used for photography, if sunlight like a sunset is required, the control unit 2 adjusts the light source unit 1 to obtain basic light close to the blackbody radiation locus 41, and controls the change in brightness of the fourth light source group 14 according to the desired saturation of red light. In this way, a reddish basic light can be obtained.

[0067] In summary, according to the light-emitting device of the present invention, the three fluorescent layers 105 emit a predetermined light in response to absorbing the blue light of the three wavelength ranges emitted by the light-emitting diodes 102, 103, and 104 as described above, and when the lights emitted by the fluorescent layers 105 are mixed, the light-emitting device 100 of the present invention can emit a predetermined white light, which has a sufficient blue-green color to simulate sunlight.

[0068] In addition, according to the lighting device of the present invention, the control unit 2 controls the brightness change of each light-emitting element 10 so that the mixing coordinate 17 associated with the light mixed by those light-emitting elements 10 is on or close to the blackbody radiation locus 41 in the first chromaticity range 42, so that the mixed light becomes light similar to sunlight, and the effect of faithfully reproducing the color of an actual object can be obtained.

[0069] As in the above embodiment, the present invention can be modified in various ways without departing from the spirit and scope of the present invention. [Industrial Applicability]

[0070] The light emitting element of the present invention can simulate sunlight. In addition, the lighting device of the present invention can emit light similar to sunlight, so it can achieve the effect of faithfully reproducing the color of an actual object. Therefore, the present invention has industrial applicability. [Explanation of symbols]

[0071] 1 Light source unit 10 Light emitting element 101 Bottom plate 102 First light emitting diode 103 Second light emitting diode 104 Third Light Emitting Diode 105 Fluorescent Layer 11 1st light source 112 First coordinate 12 Second light source 122 Second Coordinate 13 Third light source 132 3rd coordinate 14 4th light source group 141 4th coordinate 15 5th light source group 151 5th coordinate 16 6th light source group 161 6th coordinate 17 Mixed coordinates 18 Intersection 2. Control section 3. Substrate 41 Blackbody radiation locus 42 1st chromaticity range 43 Second chromaticity range 91 Coordinates 92 Coordinates

Claims

1. A light-emitting element capable of emitting white light, The light emitting diode includes a bottom plate, a first light emitting diode, a second light emitting diode, a third light emitting diode, and three fluorescent layers; the first light emitting diode, the second light emitting diode, and the third light emitting diode are all disposed on the bottom plate; The first light emitting diode may emit a first blue light having a wavelength range of 410 nm to 450 nm; The second light emitting diode may emit a second blue light having a wavelength range of 450 nm to 470 nm; The third light emitting diode may emit a third blue light having a wavelength range of 460 nm to 490 nm; the three fluorescent layers cover the surfaces of the first light emitting diode, the second light emitting diode, and the third light emitting diode, respectively, corresponding to the first light emitting diode, the second light emitting diode, and the third light emitting diode; When the three fluorescent layers absorb the first blue light, the second blue light, and the third blue light, they are excited by the first blue light, the second blue light, and the third blue light, and each of the fluorescent layers emits a predetermined light, and when the predetermined lights emitted by the three fluorescent layers are mixed, the light-emitting element can emit a predetermined white light. A light-emitting element characterized by:

2. The color temperatures of the first blue light, the second blue light, and the third blue light are all within a range of 2700K to 7500K. The light-emitting device according to claim 1 .

3. When the environmental temperature is within a range of 30°C to 90°C, the white light emitted by the light-emitting element has a color rendering index R9 of greater than 91; The light-emitting device according to claim 1 .

4. When the environmental temperature is within a range of 30°C to 90°C, the white light emitted by the light-emitting element has a color rendering index R12 of greater than 91; The light-emitting device according to claim 1 .

5. A light source unit and a control unit electrically connected to the light source unit, The light source unit includes at least three light emitting elements according to any one of claims 1 to 4, In the CIE chromaticity diagram, the chromaticity coordinates of the three light-emitting elements are defined as a first coordinate, a second coordinate, and a third coordinate, respectively; The three light-emitting elements have different correlated color temperatures, a straight line connecting the first coordinate, the second coordinate, and the third coordinate intersects with a blackbody radiation locus in the CIE chromaticity diagram and surrounds a first chromaticity range, a portion of the blackbody radiation locus being within the first chromaticity range; The chromaticity coordinates in the CIE chromaticity diagram of the light mixed by the three light-emitting elements are defined as mixed coordinates; When the power supply is turned on, the control unit is configured to supply power to the light source unit to control a brightness change of each of the light emitting elements so as to move the mixed coordinate within the first chromaticity range. A lighting device characterized by:

6. At least two of the first coordinate, the second coordinate, and the third coordinate are not on the blackbody radiation locus.

6. The lighting device according to claim 5.

7. None of the first coordinate, the second coordinate, and the third coordinate is on the blackbody radiation locus.

6. The lighting device according to claim 5.

8. a straight line connecting the first coordinate, the second coordinate, and the third coordinate intersects with the blackbody radiation locus at two intersection points; At the intersection of the two points, one point represents a color temperature below 1800K, while the other point represents a color temperature above 10000K.

6. The lighting device according to claim 5.

9. a straight line connecting the first coordinate and the third coordinate intersects with the blackbody radiation locus at two intersection points; At the intersection of the two points, one point represents a color temperature below 1800K, while the other point represents a color temperature above 10000K.

6. The lighting device according to claim 5.

10. The correlated color temperature of the light-emitting element corresponding to the first coordinate is within a range of 1800K to 2600K.

6. The lighting device according to claim 5.

11. The correlated color temperature of the light-emitting element corresponding to the second coordinate is within a range of 2600K to 4500K.

11. The lighting device according to claim 10.

12. The correlated color temperature of the light-emitting element corresponding to the third coordinate is within a range of 6500K to 10000K.

12. The lighting device according to claim 11.

13. The lighting device further comprises a substrate, On the substrate, the three light-emitting elements are arranged in a staggered arrangement.

6. The lighting device according to claim 5.

14. the light source unit further includes a light source group emitting red light, a light source group emitting green light, and a light source group emitting blue light, When the power supply is turned on, the control unit is configured to supply power to the light source unit and control brightness changes of the light source group emitting the red light, the light source group emitting the green light, and the light source group emitting the blue light.

6. The lighting device according to claim 5.

15. In the CIE chromaticity diagram, the chromaticity coordinates of the light source group emitting the red light are defined as a fourth coordinate, the chromaticity coordinates of the light source group emitting the green light are defined as a fifth coordinate, and the chromaticity coordinates of the light source group emitting the blue light are defined as a sixth coordinate; a straight line connecting the fourth coordinate, the fifth coordinate, and the sixth coordinate surrounds a second chromaticity range, The area of ​​the second chromaticity range is greater than the area of ​​the first chromaticity range.

15. The lighting device according to claim 14.

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