Light-emitting devices

Abstract

An embodiment of the present invention provides a light-emitting device. The light-emitting device includes: a first light-emitting unit, the color coordinate x of the first light-emitting unit is in the range of 0.65>x>0.49, and the color point of the first light-emitting unit is below the black body radiation line; a second light-emitting unit, the color coordinate x of the second light-emitting unit is in the range of 0.48>x>0.4, and the color point of the second light-emitting unit is above the black body radiation line; and two third light-emitting units, the color coordinate x of the third light-emitting unit is in the range of 0.31>x>0.22, and the color point of the third light-emitting unit is above the black body radiation line. The light-emitting device of this embodiment dims in the process of dimming with CIExy in close contact with the black body radiation line.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to a light emitting device capable of realizing full-spectrum white light dimming. Background Art

[0002] Human life cannot be separated from lighting, and the most basic element of lighting is the light source. Especially with the development of lighting technology, common lighting sources have evolved from early incandescent lamps and fluorescent lamps to the more widely used LEDs in recent years. Currently, dimming products on the market can achieve color temperature dimming by adjusting the current ratio of two single-color temperature basic light sources, one high and one low. However, its CIExy dims along the line connecting the first and last color temperatures, and the middle color temperature is far away from the black body radiation line.

[0003] See also Figure 1 Since the blackbody radiation line is curved, when the dual color temperature dimming product is dimmed, the color of the middle color temperature will deviate from the blackbody radiation line. For example, the saturation of red will increase, so there is a deviation between the color coordinates of the dimmed light and the color of the standard color point. For the dimming of conventional CRI80 and CRI90 light sources, since the R9 of the basic monochromatic temperature light source is relatively low and the red saturation is insufficient, the deviation from the blackbody radiation line has little effect on the middle color temperature CRI value. For products with R9 greater than 90, such as full-spectrum white light sources, since the red saturation of the basic monochromatic temperature light source is already very high, the middle color temperature obtained by this dimming method will deviate from the blackbody radiation line, resulting in oversaturation of red and thus making the middle color temperature CRI low, which cannot meet the requirements of full-spectrum white light. Therefore, there is an urgent need for a luminous product that can achieve full-spectrum white light dimming to solve the need for CIExy to fit the blackbody radiation line dimming process in the full-spectrum white light dimming process. Summary of the invention

[0004] Therefore, in order to overcome at least some of the defects and shortcomings in the prior art, an embodiment of the present invention provides a light emitting device.

[0005] On the one hand, the light-emitting device provided by an embodiment of the present invention includes: a first light-emitting unit, the color coordinate x of the first light-emitting unit is in the range of 0.65>x>0.49, and the color point of the first light-emitting unit is below the blackbody radiation line; a second light-emitting unit, the color coordinate x of the second light-emitting unit is in the range of 0.48>x>0.4, and the color point of the second light-emitting unit is above the blackbody radiation line; and a third light-emitting unit, the color coordinate x of the third light-emitting unit is in the range of 0.31>x>0.22, and the color point of the third light-emitting unit is above the blackbody radiation line.

[0006] From the above, it can be seen that the embodiment of the present invention can achieve full-spectrum white light 2700~6500K dimming with a smaller color gamut by selecting at least three specific light-emitting units, so that the brightness of the light-emitting device is higher and the lighting efficiency is better, and the light-emitting device CIExy is close to the blackbody radiation dimming during the dimming process; and the setting of the two third light-emitting units can make the maximum current used by each light-emitting unit during the adjustment process as close as possible, and the power of the light-emitting device can be greater. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0008] Figure 1 A comparison chart of the dimming trajectory of blackbody radiation and existing technology.

[0009] Figure 2 A schematic structural diagram of a light emitting device provided in an embodiment of the present invention.

[0010] Figure 3 for Figure 2 Color coordinate diagram of the light-emitting device.

[0011] Figure 4 for Figure 2 Schematic diagram of the spectrum of the light-emitting device.

[0012] Figure 5A and Figure 5B for Figure 2 Schematic diagram of the spectrum of white light synthesized by the light-emitting device at different color temperatures.

[0013] Fig. 6A It is a schematic diagram of the structure of the bracket in the light emitting device of this embodiment.

[0014] Figure 6B Schematic diagram of the structure of the light emitting device of this embodiment.

[0015] Figure 7 FIG. 4 is another schematic diagram of the structure of the light emitting device of this embodiment.

[0016] Figure 8 It is another structural schematic diagram of the light emitting device of this embodiment.

[0017] Fig. 9 It is another structural schematic diagram of the light emitting device of this embodiment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0019] In the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0020] See also Figure 2 and Figure 3 The embodiment of the present invention provides a light-emitting device 10, which may include, for example, a first light-emitting unit 11, a second light-emitting unit 12, and two third light-emitting units 13 / 13'. The color coordinate x of the first light-emitting unit 11 is in the range of 0.65>x>0.49, and the color point of the first light-emitting unit 11 is below the black body radiation line; the color coordinate x of the second light-emitting unit 12 is in the range of 0.48>x>0.4, and the color point of the second light-emitting unit 12 is above the black body radiation line; the color coordinate x of the third light-emitting unit 13 is in the range of 0.31>x>0.22, and the color point of the third light-emitting unit 13 is above the black body radiation line.

[0021] By setting the color point of the first light-emitting unit 11 below the black body radiation line, the color point of the second light-emitting unit 12 above the black body radiation line, and the color point of the third light-emitting unit 13 above the black body radiation line, and setting the range of the color coordinate x of the first light-emitting unit 11 to 0.65>x>0.49, the range of the color coordinate x of the second light-emitting unit 12 to 0.48>x>0.4, and the range of the color coordinate x of the third light-emitting unit to 0.31>x>0.22. The closer the light emitted by the light-emitting device 10 is to the peak value of 555nm of the photopic vision function, the higher the brightness will be. Taking the third light-emitting unit 13 as an example, under the premise of covering all CCTs, the larger the color coordinate x, the higher the brightness; taking the first light-emitting unit 11 as an example, the lower the color point is, the more red light accounts for, and the lower the brightness; although the second light-emitting unit 12 has a higher brightness as the color coordinate y is higher, the higher the color coordinate y is, the smaller the current proportion in the mixed light will be, which will cause the current of the first light-emitting unit 11 to become higher and the overall brightness will become worse. Therefore, see Figure 3The light emitting device 10 provided in this embodiment makes the color gamut area enclosed by the three light emitting units smaller within the same color temperature range, and the mixed light brightness can be improved, so that the light efficiency of the light emitting device 10 is also better. The two third light emitting units 13 / 13' can be set to make the maximum current used by each light emitting unit as close as possible during the adjustment process, and the power of the light emitting device 10 can be made greater.

[0022] Further, in one implementation of the present embodiment, the distance between the color points of the first light-emitting unit 11 and the second light-emitting unit 12 ranges from 0.09 to 0.14, the distance between the color points of the second light-emitting unit 12 and the third light-emitting unit 13 ranges from 0.19 to 0.24, and the distance between the color points of the third light-emitting unit 13 and the first light-emitting unit 11 ranges from 0.24 to 0.28. By limiting the distance between the color points of the first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13, the area of ​​the color gamut region enclosed by the first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13 is further limited.

[0023] In another implementation of the present embodiment, the color coordinate y of the first light-emitting unit 11 is in the range of 0.33 to 0.415, the color coordinate y of the second light-emitting unit 12 is in the range of 0.4 to 0.52, and the color coordinate y of the third light-emitting unit 13 is in the range of 0.25 to 0.38. The ranges of the color coordinates x and y of the first light-emitting unit 11, the second light-emitting unit 12 and the third light-emitting unit 13 are limited to further limit the area of ​​the color gamut region enclosed by the first light-emitting unit 11, the second light-emitting unit 12 and the third light-emitting unit 13, so that the light-emitting device 10 can cover the same color temperature range, and the area of ​​the color gamut region enclosed by the three light-emitting units is smaller, and the light efficiency of the light-emitting device 10 can be better.

[0024] Further, see Figure 4 In the light-emitting device 10 provided in the present embodiment, the peak wavelength of the light emitted by the first light-emitting unit 11 is greater than the peak wavelength of the light emitted by the second light-emitting unit 12, and the peak wavelength of the light emitted by the second light-emitting unit 12 is greater than the peak wavelength of the light emitted by the third light-emitting unit 13. Specifically, the peak wavelength range of the light emitted by the first light-emitting unit 11 may be, for example, 632 to 642 nanometers, the peak wavelength range of the light emitted by the second light-emitting unit 12 may be, for example, 624 to 636 nanometers, and the peak wavelength range of the light emitted by the third light-emitting unit 13 may be, for example, 430 to 480 nanometers, so that the light-emitting device 10 can cover the same color temperature range, and the area of ​​the color gamut area enclosed by the three light-emitting units is smaller. In this way, the light efficiency of the light-emitting device 10 can be better. By selecting the peak wavelengths of the three light-emitting units, the result of the entire dimming is more in line with the standard light source (full-spectrum white light) within the visible light range recognizable by the human eye.

[0025] In the light-emitting device 10 provided in the present embodiment, in order to achieve dimming results that meet the requirements of full-spectrum white light (CRI is greater than 95, Rf is greater than 95, and R1 to R14 are all greater than 90), the half-maximum full width (half-wave width) range of the light emitted by the first light-emitting unit 11 is greater than 95 nanometers, the half-maximum full width range of the light emitted by the second light-emitting unit 12 is greater than 180 nanometers, and the half-maximum full width range of the light emitted by the third light-emitting unit 13 is greater than 150 nanometers. In order to achieve a dimming result that is more in line with the spectral curve of the standard light source at the corresponding color temperature, the 70% high full-wave width range of the light emitted by the first light-emitting unit 11 can be selected to be greater than 65 nanometers, the 70% high full-wave width range of the light emitted by the second light-emitting unit 12 is greater than 135 nanometers, and the 70% high full-wave width range of the light emitted by the third light-emitting unit 13 is greater than 115 nanometers.

[0026] In one implementation of the present embodiment, the first light-emitting unit 11 may include, for example, a first light-emitting chip, the second light-emitting unit 12 may include, for example, a second light-emitting chip, and the third light-emitting unit 13 may include, for example, a third light-emitting chip. In a specific implementation of the present embodiment, the third light-emitting chip uses a wide-wave blue light chip, that is, a blue light chip with a half-wave width greater than 25 nanometers, which may have multiple peaks (or peak inflection points). Taking the current density of 120 mA / mm2 as an example, the wavelength of one of the main peaks of the wide-wave blue light chip used in the present embodiment is in the range of 430 to 445 nanometers, that is, the wide-wave blue light chip used in the third light-emitting unit 13 of the present embodiment has at least a first peak in the range of 430 to 445 nanometers. The first light-emitting chip and the second light-emitting chip can adopt the same wide-wave blue light chip, or can adopt a conventional narrow-wave blue light chip, that is, a blue light chip with a half-wave width less than 20 nanometers and a single peak. In a specific embodiment, the main wavelength of the first light-emitting chip and the second light-emitting chip ranges from 445 to 470 nanometers. In a preferred embodiment, the main wavelengths of the first light-emitting chip and the second light-emitting chip can differ by 9 nanometers or more, so that the light-emitting device 10 can be closer to full-spectrum white light in the blue light part.

[0027] In another embodiment of the present embodiment, the first light-emitting unit 11 may include, for example, a first light-emitting chip, the second light-emitting unit 12 may include, for example, a second light-emitting chip, one of the two third light-emitting units 13 may include, for example, a fourth light-emitting chip, and the other third light-emitting unit 13' may include, for example, a fifth light-emitting chip. The first light-emitting chip and the second light-emitting chip are the same as those described above, and may use a wide-wave blue light chip or a narrow-wave blue light chip. The fourth light-emitting chip and the fifth light-emitting chip may use narrow-wave blue light chips with different main wavelengths, which are mixed to form a wide-wave blue light. For example, the main wavelength range of the fourth light-emitting chip is 435 to 460 nanometers, and the main wavelength range of the fifth light-emitting chip may be 460 to 470 nanometers. That is, in one embodiment of the present embodiment, the two third light-emitting units 13 / 13' may be the same, for example, and both use the aforementioned wide-wave blue light chip. In another embodiment of the present embodiment, the two third light-emitting units 13 / 13' may be different, for example, and may use the aforementioned fourth light-emitting chip and the aforementioned fifth light-emitting chip, respectively.

[0028] Further, the light-emitting unit may, for example, include a light-emitting chip and a wavelength conversion medium, the wavelength conversion medium may, for example, be covered on the light-emitting chip, the light-emitting chip may, for example, use the LED blue light chip described above, and the wavelength conversion medium may, for example, use phosphor. The first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13 may, for example, use the same phosphor but use different ratios, or may use different phosphors. Of course, the present embodiment is not limited thereto. Specifically, in one implementation of the present embodiment, the first light-emitting unit 11 may, for example, include a first red phosphor and a first yellow-green phosphor, the second light-emitting unit 12 may, for example, include a second red phosphor and a second yellow-green phosphor, the third light-emitting unit 13 may, for example, include a third red phosphor and a third yellow-green phosphor, the first red phosphor, the second red phosphor, and the third red phosphor may, for example, select one of SCASN / CASN / BSSN, and the first yellow-green phosphor, the second yellow-green phosphor, and the third yellow-green phosphor may select one of LuAG, LuYAG, GaYAG, and YAG. Among them, the content of the first red phosphor is greater than the content of the second red phosphor, and the content of the second red phosphor is greater than the content of the third red phosphor. In the specific implementation of this embodiment, the weight of the first red phosphor is between 3 and 8 times the weight of the second red phosphor, and the weight of the first red phosphor is more than 5 times the weight of the third red phosphor. Referring to Table 1, for example, in the first light-emitting unit 11, the proportion of the first red phosphor can be, for example, greater than 20%, and the proportion of the first yellow-green phosphor can be, for example, less than 80%; in the second light-emitting unit 12, the proportion of the first red phosphor can be, for example, less than 10%, and the proportion of the second yellow-green phosphor can be, for example, greater than 90%; in the third light-emitting unit 13, the proportion of the first red phosphor can be, for example, less than 2%, and the proportion of the second yellow-green phosphor can be, for example, less than 98%.

[0029]

Table 1

[0030]

[0031] like Figure 4As shown, by selecting the phosphor, the spectrum generated by the third light-emitting unit 13 in the light-emitting device 10 after exciting the third yellow-green phosphor and the third red phosphor can have a ratio of the maximum intensity at 500-550nm to the maximum intensity at 400-480nm between 60% and 80%, while the ratio of the maximum intensity at 400-480nm to the maximum intensity at 500-780nm of the first light-emitting unit 11 and the second light-emitting unit 12 is less than 25%. In this way, the blue light band in the white light spectrum synthesized by the light-emitting device 10 can be mainly contributed by the third light-emitting unit 13, and the blue light ratio of the first light-emitting unit 11 and the second light-emitting unit 12 is as low as possible, so as to better achieve low color temperature (the low color temperature can be, for example, 2700K).

[0032] See also Figure 5A and Figure 5B, the light mixing effect of the light emitting device 10 provided in this embodiment is achieved in the range of 2700-6500K, CRI, Rf are all above 95, R1-R14 are all above 90, and CIExy of the light emitting device 10 can be dimmed along the black body radiation line (that is, the spectrum is within the range of 425-690 nanometers recognizable by the human eye, which is closer to the standard light source curve). Taking the light emitting device 10 provided in this embodiment as an example, including a third light emitting unit 11, a second light emitting unit 12 and two third light emitting units 13 / 13', the current ratio of the third light emitting unit 13 / 13' increases with the increase of color temperature, the current ratio of the second light emitting unit 12 increases first and then decreases with the increase of color temperature, and the current ratio of the first light emitting unit 11 decreases with the increase of color temperature. Referring to Table 2, the sum of the current ratios of a first light emitting unit 11, a second light emitting unit 12 and two third light emitting units 13 / 13' is 100%, and the current ratios of the two third light emitting units 13 / 13' can be the same, for example. When the color temperature is 2700K, the current ratio of the first light-emitting unit 11 may be, for example, 50%, when the color temperature is 3000K, the current ratio of the first light-emitting unit 11 may be, for example, 39.9%, when the color temperature is 3500K, the current ratio of the first light-emitting unit 11 may be, for example, 29.9%, that is, the current ratio of the first light-emitting unit 11 decreases as the color temperature increases. When the color temperature is 2700K, the current ratio of the second light-emitting unit 12 may be, for example, 44.8%, when the color temperature is 3000K, the current ratio of the second light-emitting unit 12 may be, for example, 48.6%, when the color temperature is 3500K, the current ratio of the second light-emitting unit 12 may be, for example, 49.4%, when the color temperature is 4000K, the current ratio of the second light-emitting unit 12 may be, for example, 49.0%, when the color temperature is 5000K, the current ratio of the second light-emitting unit 12 may be, for example, 32.3%, that is, the current ratio of the second light-emitting unit 12 increases first and then decreases as the color temperature increases. When the color temperature is 2700K, the current ratio of the third light-emitting unit 13 / 13' may be, for example, 2.6%; when the color temperature is 3000K, the current ratio of the third light-emitting unit 13 / 13' may be, for example, 5.8%; when the color temperature is 3500K, the current ratio of the third light-emitting unit 13 / 13' may be, for example, 10.3%, that is, the current ratio of the third light-emitting unit 13 / 13' increases with the increase of color temperature.

[0033]

Table 2

[0034]

[0035] The light emitting device 10 provided in the embodiment of the present invention is as follows Figure 2As shown, the first light-emitting unit 11 may, for example, include a first light-emitting chip and a first package covering the first light-emitting chip, the second light-emitting unit 12 may, for example, include a second light-emitting chip and a second package covering the second light-emitting chip, and the blue light-emitting chip 13 may, for example, include a third light-emitting chip and a third package covering the third light-emitting chip.

[0036] For example, a specific structure of the light-emitting device 10 provided in the embodiment of the present invention may include a bracket and a package body. Referring to FIG6 , a specific structure of the light-emitting device 10 provided in the embodiment of the present invention may be, for example, as shown in FIG6 , and the light-emitting device 10 may include, for example, a first light-emitting unit 11, a second light-emitting unit 12, and two third light-emitting units 13 / 13'. The bracket is provided with a first receiving groove 21, a second receiving groove 22, a third receiving groove 23, and a fourth receiving groove 24. The first light-emitting unit 11 may be, for example, arranged in the first receiving groove 21, the second light-emitting unit 12 may be arranged in the fourth receiving groove 24, the third light-emitting unit 13 may be arranged in the second receiving groove 22, and another third light-emitting unit 13' may be arranged in the fourth receiving groove 24. Among them, the second receiving groove 22 and the fourth receiving groove 14 may be, for example, diagonally distributed, that is, the third light-emitting unit 13 and another third light-emitting unit 13' are diagonally distributed, so that the light mixing effect is better.

[0037] Another specific structure of the light emitting device 10 provided in the embodiment of the present invention is as follows Figure 7 The COB substrate may be provided with, for example, a plurality of first light-emitting chips, a plurality of second light-emitting chips, and a plurality of third light-emitting chips. The first fluorescent glue covers the plurality of first light-emitting chips to form a first light-emitting unit 11. The second fluorescent glue covers the plurality of second light-emitting chips to form a second light-emitting unit 12. The third fluorescent glue covers the plurality of third light-emitting chips to form a third light-emitting unit 13.

[0038] Another specific structure of the light emitting device 10 provided in the embodiment of the present invention is as follows Figure 8 A plurality of chip scale packages (CSP) of first light emitting units 11, second light emitting units 12 and third light emitting units 13 are disposed on the substrate, and the first light emitting units 11, second light emitting units 12 and third light emitting units 13 are preferably arranged in a chessboard-like staggered manner.

[0039] Another specific structure of the light emitting device 10 provided in the embodiment of the present invention is as follows Fig. 9 As shown. The plurality of first light-emitting units 11, second light-emitting units 12 and third light-emitting units 13 may be SMD lamp beads. They are alternately or staggeredly arranged on a substrate to form a full-spectrum white light board or light bar type light-emitting device 10. Of course, the above is only an example, and the present embodiment is not limited thereto.

[0040] In summary, the embodiment of the present invention sets the light-emitting device 10 to include at least three different light-emitting units, and through the specific selection of the color point, peak wavelength, half-wave width, etc. of each light-emitting unit, the light-emitting device 10 of this embodiment makes CIExy fit the blackbody radiation dimming during the dimming process, and the color tolerance meets the requirements of 4step. The result of the entire dimming is more in line with the standard light source (full-spectrum white light) within the visible light range recognizable by the human eye.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light emitting device, characterized in that: include: A first light-emitting unit, wherein the color coordinate x of the first light-emitting unit is in the range of 0.65>x>0.49, and the color point of the first light-emitting unit is below the black body radiation line; a second light-emitting unit, wherein the color coordinate x of the second light-emitting unit is in the range of 0.48>x>0.4, and the color point of the second light-emitting unit is above the black body radiation line; and Two third light-emitting units, the range of the color coordinate x of the third light-emitting units is 0.31>x>0.22, and the color point of the third light-emitting units is above the black body radiation line.

2. The light emitting device according to claim 1, characterized in that: The distance between the color points of the first light-emitting unit and the second light-emitting unit ranges from 0.09 to 0.14, the distance between the color points of the second light-emitting unit and the third light-emitting unit ranges from 0.19 to 0.24, and the distance between the color points of the third light-emitting unit and the first light-emitting unit ranges from 0.24 to 0.

28.

3. The light emitting device according to claim 1, characterized in that: The color coordinate y of the first light emitting unit is in the range of 0.33 to 0.415, the color coordinate y of the second light emitting unit is in the range of 0.4 to 0.52, and the color coordinate y of the third light emitting unit is in the range of 0.25 to 0.

38.

4. The light emitting device according to claim 1, characterized in that: The peak wavelength range of the light emitted by the first light emitting unit is 632-642 nanometers, the peak wavelength range of the light emitted by the second light emitting unit is 624-636 nanometers, and the peak wavelength range of the light emitted by the third light emitting unit is 430-480 nanometers.

5. The light emitting device according to claim 1, characterized in that: The half-wave width of the light emitted by the first light-emitting unit is greater than 95 nanometers, the half-wave width of the light emitted by the second light-emitting unit is greater than 180 nanometers, and the half-wave width of the light emitted by the third light-emitting unit is greater than 150 nanometers.

6. The light emitting device according to claim 1, characterized in that: The third light-emitting unit includes a third light-emitting chip. The half-wave width of the third light-emitting chip is greater than 25 nanometers and has a first peak value in the range of 430 to 445 nanometers.

7. The light emitting device according to claim 1, characterized in that: One of the two third light-emitting units includes a fourth light-emitting chip, and the other third light-emitting unit includes a fifth light-emitting chip. The main wavelength range of the fourth light-emitting chip is 435-460 nanometers, and the main wavelength range of the fifth light-emitting chip is 460-470 nanometers.

8. The light emitting device according to any one of claims 6 to 7, characterized in that: The first light-emitting unit also includes a first red phosphor and a first yellow-green phosphor, the second light-emitting unit also includes a second red phosphor and a second yellow-green phosphor, the third light-emitting unit also includes a third red phosphor and a third yellow-green phosphor, and the content of the first red phosphor is greater than that of the second red phosphor, and the content of the second red phosphor is greater than that of the third red phosphor.

9. The light emitting device according to claim 6, characterized in that: The first light emitting unit includes a first light emitting chip and a first package covering the first light emitting chip, the second light emitting unit includes a second light emitting chip and a second package covering the second light emitting chip, and the third light emitting unit further includes a third package covering the third light emitting chip.

10. The light emitting device according to claim 1, characterized in that: Also includes: A bracket, wherein a first accommodating groove, a second accommodating groove, a third accommodating groove and a fourth accommodating groove are arranged on the bracket, the first light-emitting unit is arranged in the first accommodating groove, the second light-emitting unit is arranged in the second accommodating groove, and the two third light-emitting units are respectively arranged in the third accommodating groove and the fourth accommodating groove.

11. The light emitting device according to any one of claims 6 to 7, characterized in that: The first light emitting unit, the second light emitting unit and the third light emitting unit are chip-scale packages.

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