Light emitting device
By selecting a specific range of light emitting units to cover the area of the color temperature range on the blackbody radiation line, the problem of dimming trajectory deviating from the blackbody radiation line in the prior art is solved, and a large-scale color temperature dimming and efficient light effect are achieved.
Patent Information
- Application Number
- CN202420923184.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The prior art cannot effectively realize large-scale color temperature dimming during dimming, and the dimming trajectory deviates from the blackbody radiation, resulting in a deviation of the color coordinates from the color of the standard color point.
By selecting at least three specific luminescent units, the color coordinate ranges are 0.6>x>0.53, 0.48>x>0.4 and 0.24>x>0.18, respectively, and the area surrounded by these color points covers the color temperature range on the blackbody radiation line. It is a 1800K to 10000K area.
A large-scale color temperature dimming (such as 1800K-10000K) is achieved, and CIExy is applied to the blackbody radiation during the dimming process to meet the color tolerance requirements of 4step.
Smart Images
Figure CN222442217U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of lighting technology, and in particular to a light-emitting device. Background Art
[0002] Human life is inseparable 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. The dimming products currently on the market must meet the dimming color temperature of 1800~10000K, usually use three color temperature LEDs for dimming, and the dimming landing point cannot be dimmed along the black body radiation line. Figure 1 Since the black body radiation line is arc-shaped, wide range dimming products usually use three LEDs with different color temperatures falling on the black body radiation line for dimming, so that the dimming track is as follows Figure 1 As shown, Figure 1 The dimming trajectory of the prior art deviates significantly from the black body radiation line, so the color coordinates obtained by dimming deviate from the color of the standard color point.
[0003] Therefore, there is an urgent need for a light-emitting device that can achieve a wide range of color temperature dimming and solve the problem of CIExy dimming in line with blackbody radiation during the 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] Specifically, the light-emitting device provided by the embodiment of the present invention includes: two first light-emitting units, the color coordinate x of the first light-emitting units is in the range of 0.6>x>0.53, and the color point of the first light-emitting unit is near 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 a third light-emitting unit, the color coordinate x of the third light-emitting unit is in the range of 0.24>x>0.18, and the color point of the third light-emitting unit is above the black body radiation line; and the area enclosed by the color points of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit covers the area on the black body radiation line with a color temperature range of 1800K to 10000K.
[0006] From the above, it can be seen that by selecting at least three specific light-emitting units, the light-emitting device of this embodiment can achieve a wide range of color temperature dimming (such as 1800K-10000K), and make CIExy fit the blackbody radiation dimming during the product dimming process. 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 and Figure 5 for Figure 2 Schematic diagram of the spectrum of the light-emitting device.
[0012] Figure 6 It is a schematic diagram of the structure of the bracket in the light emitting device of this embodiment.
[0013] Figure 7 FIG. 4 is a schematic diagram of the structure of the light emitting device of this embodiment.
[0014] Figure 8 FIG. 4 is another schematic diagram of the structure of the light emitting device of this embodiment.
[0015] Fig. 9 It is another structural schematic diagram of the light emitting device of this embodiment.
[0016] Fig.10 It is another structural schematic diagram of the light emitting device of this embodiment. DETAILED DESCRIPTION
[0017] 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.
[0018] 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.
[0019] See also Figure 2 and Figure 3 An embodiment of the present invention provides a light emitting device 10 , which may include, for example, two first light emitting units 11 / 11 ′, a second light emitting unit 12 and a third light emitting unit 13 . Figure 3 Color 1 is the light emitted after the first light-emitting unit 11 is turned on, color 2 is the light emitted after the second light-emitting unit 12 is turned on, and color 3 is the light emitted after the third light-emitting unit 13 is turned on. The color coordinate x of the first light-emitting unit 11 is in the range of 0.6>x>0.53, and the color point of the first light-emitting unit 11 is near the black body radiation line; 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; the color coordinate x of the third light-emitting unit is in the range of 0.24>x>0.18, and the color point of the third light-emitting unit is above the black body radiation line; and the area surrounded by the color points of the first light-emitting unit 11, the second light-emitting unit 12 and the third light-emitting unit 13 covers the area on the black body radiation line with a color temperature range of 1800K to 10000K. See Figure 3 The light emitting device 10 provided in this embodiment can realize a wide range of color temperature dimming (such as 1800K-10000K), and during the dimming process, the CIExy of the light emitted by the light emitting device 10 under the dimming color temperature can fit the black body radiation, and the color tolerance can meet the requirements of 4step. The setting of the two first light emitting units 11 / 11' can 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.
[0020] Furthermore, 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 0.12 to 0.16, the distance between the color points of the second light-emitting unit 12 and the third light-emitting unit 13 ranges from 0.27 to 0.34, and the distance between the color points of the third light-emitting unit 13 and the first light-emitting unit 11 ranges from 0.32 to 0.38. 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. Through such a setting, 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 higher.
[0021] In another implementation of the present embodiment, the color coordinate y of the first light-emitting unit 11 is in the range of 0.4 to 0.43, the color coordinate y of the second light-emitting unit 12 is in the range of 0.45 to 0.56, and the color coordinate y of the third light-emitting unit 13 is in the range of 0.21 to 0.3. 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. Through such a setting, the light-emitting device 10 can also 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 higher.
[0022] It should be noted that, in the light-emitting device 10 provided in one embodiment, each light-emitting unit may, for example, include a light-emitting chip and a packaging glue, the packaging glue covers the light-emitting chip, the light-emitting chip may, for example, use an LED blue light chip, and the packaging glue may, for example, include phosphors to convert the light emitted by part of the LED blue light chip into light of other colors with longer wavelengths. Specifically, the first light-emitting unit 11 may, for example, include a first light-emitting chip and a first packaging glue, the second light-emitting unit 12 may, for example, include a second light-emitting chip and a second packaging glue, and the third light-emitting unit 13 may, for example, include a third light-emitting chip and a third packaging glue. In a specific implementation of this embodiment, the main wavelength range of the first light-emitting chip may, for example, be 445 to 460 nanometers, and the half-wave width may, for example, be 16 to 20 nanometers, that is, the first light-emitting chip may, for example, use a narrow-wave blue light chip. The main wavelength range of the second light-emitting chip and the third light-emitting chip may, for example, be 445 to 460 nanometers, and the half-wave width may, for example, be 16 to 20 nanometers, that is, the second light-emitting chip and the third light-emitting chip may also, for example, use a narrow-wave blue light chip. In a specific implementation of this embodiment, the first light-emitting chip, the second light-emitting chip and the third light-emitting chip may, for example, be completely the same or different.
[0023] The first packaging glue, the second packaging glue and the third packaging glue are different from each other. Specifically, the same phosphor can be used, but the phosphor ratio is different, or different phosphors can be used. In a specific embodiment, the first light-emitting unit 11 can include a first red powder, and the second light-emitting unit 12 can include a second red powder. The first red powder and the second red powder can be, for example, nitride red powder (specifically, SCASN, CASN or BSSN), fluoride red powder (in addition to KSF phosphor, it can also be KGF (K2GeF6: Mn4+) phosphor, KTF (K2TiF6: Mn4+) phosphor and other 4-valent manganese excited fluorosilicate materials, etc.), etc.
[0024] Further, see Figure 4In the light-emitting device 10 provided in this embodiment, the first red powder and the second red powder are both nitrides and do not contain fluorides. By mixing the phosphors, the peak wavelength range of the light emitted by the first light-emitting unit 11 is 610-616 nanometers, the peak wavelength range of the light emitted by the second light-emitting unit 12 is 582-588 nanometers, and the peak wavelength range of the light emitted by the third light-emitting unit 13 is 440-460 nanometers. The present invention can achieve a wide range of color temperature dimming through three different light-emitting units, and make the light-emitting device CIExy fit the blackbody radiation dimming during the dimming process.
[0025] See also Figure 5 In another specific implementation of the present embodiment, the first red powder and the second red powder may both contain fluoride. In this case, through the blending of the phosphors, the peak wavelength range of the light emitted by the first light-emitting unit 11 is 630-634 nanometers, the peak wavelength range of the light emitted by the second light-emitting unit 12 is 630-634 nanometers, and the peak wavelength range of the light emitted by the third light-emitting unit 13 is 440-460 nanometers. The present invention can achieve a wide range of color temperature dimming through three different light-emitting units, and make the light-emitting device CIExy fit the blackbody radiation dimming during the dimming process.
[0026] For the light-emitting device 10 in which both the first red powder and the second red powder contain fluoride, the content of fluoride in the first red powder may be greater than or equal to the content of fluoride in the second red powder. In order to simplify production, optionally, the content of fluoride in the first red powder is equal to the content of fluoride in the second red powder. Fluoride phosphors have a high conversion efficiency, and the use of fluoride phosphors can generally improve the luminous efficiency of light-emitting devices, but there is a problem with the current use of fluoride phosphors, that is, the color drift is relatively serious. In order to reduce color drift, for light-emitting units using fluoride phosphors, it is recommended to use a layered dispensing process during the production process, that is, when the encapsulation glue is covered on the chip, each phosphor is layered on it, and the bottom layer (i.e., the phosphor closer to the chip) can be, for example, fluoride, and the upper layer (i.e., the phosphor relatively farther away from the chip) can be, for example, a mixed colloid of yellow-green powder and nitride red powder. In order to achieve the final light emission requirements and differentiation of the first light-emitting unit 11 and the second light-emitting unit 12, the first red powder and the second red powder both contain a certain amount of nitride red powder, wherein the content of nitride in the first red powder is greater than the content of nitride in the second red powder. It should be noted that, regardless of whether the first light-emitting unit 11 and the second light-emitting unit 12 contain fluoride, the packaging glue of the third light-emitting unit 13 does not contain red powder, and the content of nitride in the first red powder is greater than the content of nitride in the second red powder.
[0027] See Table 1 for the color coordinate offset of the light emitting device 10 of the present invention at different use temperatures and different luminous color temperatures. It can be seen from the data in the table that the present invention can effectively control the color drift problem of the light emitting device. At different use temperatures and different luminous color temperatures, the absolute values of the offsets of Δx and Δy do not exceed 0.01, which can improve the compatibility of the product in different lamps.
[0028]
Table 1
[0029]
[0030]
[0031] As mentioned above, the light emitting device 10 includes three different light emitting units, which are driven independently. By distributing different currents to the three light emitting units, the light emitted by the light emitting device 10 can be in the range of 1800K to 10000K, and the color points all fall within the 4-step range of the corresponding color temperature point on the black body radiation line. That is, during the dimming process of the light emitting device 10, the CIExy of the light emitted can fit the black body radiation line, and the color tolerance can meet the requirements of 4 steps.
[0032] For specific examples, see Figure 6 and Figure 7 A specific structure of the light-emitting device 10 provided in an embodiment of the present invention may, for example, include a bracket, on which are provided a first receiving groove 21, a second receiving groove 22, a third receiving groove 23 and a fourth receiving groove 24 that can be driven independently. The light-emitting device 10 may, for example, include four light-emitting units, specifically, for example, include a first light-emitting unit 11, a second light-emitting unit 12, a second light-emitting unit 13 and another first light-emitting unit 11'. The two first light-emitting units 11 / 11' may, for example, be arranged in the first receiving groove 21 and the fourth receiving groove 24, the second light-emitting unit 12 may be arranged in the second receiving groove 22, and the third light-emitting unit 13 may be arranged in the third receiving groove 23. Among them, the first receiving groove 21 and the fourth receiving groove 24 may, for example, be distributed diagonally, which can achieve a better light mixing effect.
[0033] In a preferred embodiment, the four light-emitting units are dimmed along the black body radiation line. In the process of adjusting the color temperature from 1800K to 1000K, the current ratio of the first light-emitting unit 11 / 11' decreases and then increases as the color temperature increases, the current ratio of the second light-emitting unit 12 increases first and then decreases as the color temperature increases, and the current ratio of the third light-emitting unit 13 increases as the color temperature increases. Referring to Table 2, the light-emitting device 10 provided in this embodiment includes two first light-emitting units 11 / 11', one second light-emitting unit 12 and one third light-emitting unit 13 as an example. The sum of the current ratios of the two first light-emitting units 11 / 11', one second light-emitting unit 12 and one third light-emitting unit 13 is 100%, and the current ratios of the two first light-emitting units 11 / 11' can be the same, for example. When the color temperature is 1800K, the current ratio of the first light-emitting unit 11 / 11' can be, for example, 50% respectively; when the color temperature is 2200K, the current ratio of the first light-emitting unit 11 / 11' can be, for example, 35% respectively; when the color temperature is 4000K, the current ratio of the first light-emitting unit 11 / 11' can be, for example, 13.5% respectively; when the color temperature is 6500K, the current ratio of the first light-emitting unit 11 / 11' can be, for example, 8.6% respectively, that is, the first light-emitting unit 11 / 11' is within the color temperature range. When the color temperature is 1800-6500K, the current ratio decreases as the color temperature increases; when the color temperature is 8000K, the current ratio of the first light-emitting unit 11 / 11' can be, for example, 9.0%, and when the color temperature is 10000K, the current ratio of the first light-emitting unit 11 / 11' can be, for example, 10.2%, that is, the current ratio of the first light-emitting unit 11 / 11' increases as the color temperature increases when the color temperature range is 6500-1000K; that is, the current ratio of the first light-emitting unit 11 / 11' decreases and then increases as the color temperature increases. When the color temperature is 1800K, the current ratio of the second light-emitting unit 12 may be, for example, 0%; when the color temperature is 3000K, the current ratio of the second light-emitting unit 12 may be, for example, 46.6%; when the color temperature is 4000K, the current ratio of the second light-emitting unit 12 may be, for example, 49.8%. That is, when the color temperature range is 1800-4000K, the current ratio of the second light-emitting unit 12 increases with the increase of the color temperature; when the color temperature is 5000K, the current ratio of the second light-emitting unit 12 may be, for example, 43 .2%, when the color temperature is 6500K, the current ratio of the second light-emitting unit 12 may be, for example, 30.8%, when the color temperature is 8000K, the current ratio of the second light-emitting unit 12 may be, for example, 19.9%, when the color temperature is 10000K, the current ratio of the second light-emitting unit 12 may be, for example, 9%, that is, the current ratio of the second light-emitting unit 12 decreases as the color temperature increases when the color temperature range is 4000-10000K; that is, the current ratio of the second light-emitting unit 12 first increases and then decreases as the color temperature increases.When the color temperature is 1800K, the current ratio of the third light-emitting unit 13 may be, for example, 0%; when the color temperature is 3000K, the current ratio of the third light-emitting unit 13 may be, for example, 10.5%; when the color temperature is 6500K, the current ratio of the third light-emitting unit 13 may be, for example, 51.9%; when the color temperature is 8000K, the current ratio of the third light-emitting unit 13 may be, for example, 62%; when the color temperature is 6500K, the current ratio of the third light-emitting unit 13 may be, for example, 70.7%, that is, the current ratio of the third light-emitting unit 13 increases with the increase of color temperature.
[0034]
Table 2
[0035]
[0036] Referring to Table 3, based on the consideration of the maximum power that can be used by the first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13, an embodiment of the color point of the first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13 may be, for example, as shown in Table 3, and the current ratio of the mixed white light color temperature of 1800-6500K may be as shown in Table 2. Taking the color point coordinates of the first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13 in Table 3 as an example, when the color temperature is 1800K, the current ratio of the first light-emitting unit 11 is close to 50%, when the color temperature is 3500K or 4000K, the current ratio of the second light-emitting unit 12 is close to 50%, and when the color temperature is 6500K, the current ratio of the third light-emitting unit 13 is close to 50%, which can maximize the wattage of the dimming color temperature of the light-emitting device 10. When the color coordinate x of the first light-emitting unit 11 increases, dimming along the black body radiation line can also be achieved, but the current ratio of the first light-emitting unit 11 in each dimming color temperature will decrease, and the current ratio of the second light-emitting unit 12 will increase; at the same time, the brightness of the first light-emitting unit 11 will decrease as the color coordinate x increases. In the range of color coordinate x>0.53, the larger the color coordinate x, the lower the brightness; if the color coordinate x of the first light-emitting unit 11 decreases, when the color coordinate x is less than 0.53, the dimming of 1800K cannot be achieved at the same time. When the color coordinate x of the second light-emitting unit 12 increases, the current ratio of the second light-emitting unit 12 in each dimming color temperature will decrease, and the current ratio of the first light-emitting unit 11 will increase. When the color coordinate x of the second light-emitting unit 12 is in the range of 0.4 to 0.48, the larger the color coordinate x, the lower the brightness. When the color coordinate x of the third light-emitting unit 13 increases, the current ratio of the third light-emitting unit 13 increases, and when the color coordinate x decreases, the current ratio of the third light-emitting unit 13 decreases; in the range of color coordinate x<0.24, the larger the color coordinate x, the higher the brightness.
[0037]
Table 3
[0038] x y CCT(K) Wd(nm) Wp(nm) The first light emitting unit 0.5471 0.3973 1753 593 631 The second light emitting unit 0.4162 0.4675 3800 572 631 The third light emitting unit 0.2176 0.2626 0 483 448
[0039] A specific structure of the light emitting device 10 provided in the embodiment of the present invention is as follows Figure 2 As 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 third light-emitting unit 13 may, for example, include a third light-emitting chip and a third package covering the third light-emitting chip.
[0040] A specific structure of the light emitting device 10 provided in the embodiment of the present invention can also be as follows Figure 8 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.
[0041] Another specific structure of the light emitting device 10 provided in the embodiment of the present invention is as follows Fig. 9 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.
[0042] Another specific structure of the light emitting device 10 provided in the embodiment of the present invention is as follows Fig.10 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 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.
[0043] In summary, the embodiment of the present invention configures the light emitting device 10 to include at least three different light emitting units, and through specific selection of the color point, peak wavelength or half-wave width of each light emitting unit, the area surrounded by the color points of the first light emitting unit 11, the second light emitting unit 12 and the third light emitting unit 13 covers the area with a color temperature range of 1800K to 10000K on the black body radiation line. Figure 3 The light emitting device 10 provided in this embodiment can realize a wide range of color temperature dimming (such as 1800K-10000K), ensuring that the adjustable color temperature range falls within the range of 4 steps of the black body radiation line within this color temperature range.
[0044] In addition, it can be understood that the aforementioned embodiments are only exemplary descriptions of the present invention. Under the premise that the technical features do not conflict, the structures do not contradict, and the purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used in combination.
[0045] 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: Two first light-emitting units, wherein the color coordinate x of the first light-emitting units is in the range of 0.6>x>0.53, and the color point of the first light-emitting units is near 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; as well as A third light-emitting unit, wherein the color coordinate x of the third light-emitting unit is in the range of 0.24>x>0.18, and the color point of the third light-emitting unit is above the black body radiation line; Furthermore, the area surrounded by the color points of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit covers an area on the black body radiation line with a color temperature ranging from 1800K to 10000K.
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 0.12 to 0.16, the distance between the color points of the second light-emitting unit and the third light-emitting unit ranges from 0.27 to 0.34, and the distance between the color points of the third light-emitting unit and the first light-emitting unit ranges from 0.32 to 0.
38.
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 0.4 to 0.43, the color coordinate y of the second light emitting unit is in the range of 0.45 to 0.56, and the color coordinate y of the third light emitting unit is in the range of 0.21 to 0.
3.
4. 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 provided on the bracket, the two first light-emitting units are respectively provided in the first accommodating groove and the fourth accommodating groove, the second light-emitting unit is provided in the second accommodating groove, and the third light-emitting unit is provided in the third accommodating groove.
5. The light emitting device according to claim 1, characterized in that: The first light emitting unit, the second light emitting unit and the third light emitting unit are chip-scale packages.