White light source and lighting system

Abstract

The invention relates to a white light source and a lighting system thereof, the color temperature of the white light source is 1800K-15000K, the color rendering index is not less than 90, and the NTSC color gamut of the white light source reaches 45%-55%; the target color area of the white light source meets an area defined by a first color point, a second color point and a third color point in a CIE chromaticity diagram; the coordinate of the first color point is (x1, y1), 0.09 < = x1 < = 0.19, 0.06 < = y1 < = 0.17; the coordinate of the second color point is (x2, y2), x2 is greater than or equal to 0.34 and less than or equal to 0.44, and y2 is greater than or equal to 0.51 and less than or equal to 0.61; the coordinate of the third color point is (x3, y3), x3 is more than or equal to 0.59 and less than or equal to 0.67, and y3 is more than or equal to 0.3 and less than or equal to 0.39. The color temperature can be freely adjusted within the range of 1800-15000 K, natural illumination changes from the morning to the evening can be simulated, the color rendering index within the wide color temperature range of 1800-15000 K reaches 90 or above, and it is ensured that excellent color reduction performance can be provided under any selected color temperature condition.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lighting, and in particular to a white light source and a lighting system having the white light source. Background Art

[0002] In modern society, people's pursuit of efficient, energy-saving, and intelligent living environments continues to escalate, and the demand for smart and healthy lighting is also growing. From commercial lighting, industrial lighting, outdoor lighting to indoor lighting and special lighting, the demand for lighting effects is becoming increasingly demanding. These applications require lighting equipment to not only provide sufficient brightness but also simulate natural light to meet people's needs for visual comfort and health.

[0003] Currently, light-emitting diodes (LEDs), with their significant advantages such as high efficiency, energy saving, environmental protection, long life, compact size, and easy maintenance, are gradually replacing traditional light sources and becoming the mainstream choice for lighting. They are widely used in various fields mentioned above. One type of existing white light source utilizes R / G / B (red, green, and blue) three-primary color light-emitting chip packaging. By packaging the three red, green, and blue light-emitting chips together, white light is produced by mixing the red, green, and blue light emitted by the three chips.

[0004] However, this type of white light source has a low color rendering index (CRI) (less than 60). The color rendering index is an important indicator of a light source's ability to reproduce the color of an object. A low CRI value means that the light source is limited in its ability to reproduce the true color of an object. This insufficient color rendering performance results in unsatisfactory color reproduction and visual comfort in existing lighting products. Specifically, lighting environments using this type of light source may not accurately represent the natural color of objects, thus affecting people's perception and identification of color. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to overcome the defects or shortcomings of the existing technology and provide a white light source with an NTSC color gamut of 45%-55%, which can be freely adjusted in color temperature within the range of 1800K to 15000K, can simulate the changes in natural light from early morning to dusk, and the color rendering index within the wide color temperature range of 1800K to 15000K reaches above 90, ensuring excellent color reproduction performance under any selected color temperature conditions.

[0006] A white light source for lighting, wherein the color temperature of the white light source is 1800K-15000K and the color rendering index is not less than 90;

[0007] The target color region of the white light source satisfies: in the area surrounded by the first color point, the second color point and the third color point in the CIE chromaticity diagram, the NTSC color gamut of the white light source is 45%-55%;

[0008] The coordinates of the first color point are (x1, y1), where 0.09≤x1≤0.19, 0.06≤y1≤0.17;

[0009] The coordinates of the second color point are (x2, y2), where 0.34≤x2≤0.44, 0.51≤y2≤0.61;

[0010] The coordinates of the third color point are (x3, y3), wherein 0.59≤x3≤0.67, 0.3≤y3≤0.39.

[0011] Compared to the prior art, the white light source described in the present invention sets the target color area of ​​the light source in the CIE chromaticity diagram to be surrounded by three color points, and designs the position distribution of the three color points so that the target color area formed by the color points at least covers the color temperature range of 1800K-15000K of the blackbody radiation curve, thereby allowing the light source to be freely adjusted within this color temperature range. Moreover, by limiting the position distribution of the above three color points, the NTSC color gamut of the light source is maintained at 45%-55%, ensuring that the color rendering index within the target color area reaches 90 or above, so that the white light source can display a relatively rich variety of colors and provide excellent color reproduction performance under any selected color temperature conditions within the range of 1800K-15000K.

[0012] In addition, the present invention also provides a lighting system, comprising the above-mentioned white light source, wherein the white light source comprises:

[0013] A first light-emitting unit, wherein the first light-emitting unit can emit the blue light spectrum, wherein the first light-emitting unit includes:

[0014] a first light-emitting chip, and

[0015] a first fluorescent glue covering a light-emitting surface of the first light-emitting chip;

[0016] a second light-emitting unit, wherein the second light-emitting unit can emit the green light spectrum, wherein the second light-emitting unit includes:

[0017] a second light-emitting chip, and

[0018] a second fluorescent glue covering a light-emitting surface of the second light-emitting chip;

[0019] a third light-emitting unit, the third light-emitting unit being capable of emitting the red light spectrum, wherein the third light-emitting unit comprises:

[0020] a third light-emitting chip, and

[0021] A third fluorescent glue covers the light-emitting surface of the third light-emitting chip.

[0022] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the target color region of a white light source on the CIE chromaticity diagram according to an embodiment of the present invention;

[0024] Figure 2 Spectral diagram (relative spectrum) of blue light spectrum, green light spectrum and red light spectrum formed by decomposing the emission spectrum of the white light source according to the embodiment of the present invention;

[0025] Figure 3 for Figure 2 Detailed diagram of

[0026] Figure 4 Emission spectra of the white light source according to an embodiment of the present invention at 6500K, 5000K, 4000K, 3000K, 2700K, 2200K, 2000K and 1800K;

[0027] Figure 5 Spectra of blue light spectrum, green light spectrum and red light spectrum formed by decomposition of the white light source of Comparative Example 1 (relative spectrum);

[0028] Figure 6 Schematic diagram of the target color area of ​​the white light source of Comparative Example 2 on the CIE chromaticity diagram. DETAILED DESCRIPTION

[0029] Existing white light sources composed of R / G / B primary color light-emitting chips have some wavelength regions with weak light intensity. When the emitted light from the light source illuminates an object, some colors may not be accurately restored, resulting in a low color rendering index (CRI) (below 60).

[0030] Based on this, the inventors of the present invention provide a white light source for an illumination system. By setting the target color region of the white light source in the CIE chromaticity diagram to be surrounded by three color points, and designing the position distribution of the three color points, the target color region formed by the color points at least encompasses the color temperature range of 1800K-15000K of the blackbody radiation curve. By limiting the position distribution of the above three color points, the NTSC color gamut of the light source is maintained at 45%-55%, ensuring that the color rendering index within the target color region reaches 90 or above.

[0031] The solution of the present invention is described in detail below with reference to the accompanying drawings.

[0032] The present invention provides a lighting system, comprising a white light source and a control unit, wherein the white light source comprises a first light emitting unit capable of emitting a first emission light, a second light emitting unit capable of emitting a second emission light, and a third light emitting unit capable of emitting a third emission light. The control unit is electrically connected to the first light emitting unit, the second light emitting unit, and the third light emitting unit, respectively, to control the driving of each light emitting unit, and adjusts the color temperature of the combined light from the first light emitting unit, the second light emitting unit, and the third light emitting unit by regulating the luminous intensity of each light emitting unit. Specifically, the control unit can adjust the equivalent driving current of each light emitting unit respectively, thereby accurately controlling their brightness, that is, the luminous intensity. In this way, it can be ensured that the luminous ratio of each light emitting unit meets the pre-set requirements, so that the color temperature of the mixed light can accurately fall on the blackbody radiation trajectory, thereby producing the desired white light effect.

[0033] The spectrum of the first emission light, the spectrum of the second emission light, and the spectrum of the third emission hook of the above-mentioned white light source are mapped to the CIE chromaticity diagram, corresponding to the first color point P1, the second color point P2, and the third color point P3. These three color points enclose a triangular target color area, that is, the target color area of ​​the white light source. Specifically, let the coordinates of the first color point P1 be (x1, y1), and the coordinate range of the first color point P1 be limited to 0.09≤x1≤0.19, 0.06≤y1≤0.17, preferably, 0.11≤x1≤0.17, 0.09≤y1≤0.14; let the coordinates of the second color point P2 be (x2, y2), and the coordinate range of the second color point P2 be limited to 0.34≤x2≤0.44, 0.51≤y2≤0.61, preferably, 0.36≤x2≤0.43, 0.52≤y2≤0.59; let the coordinates of the third color point P3 be (x3, y3), and the coordinate range of the third color point P3 be limited to: 0.59≤x3≤0.67, 0.3≤y3≤0.39, preferably, 0.61≤x3≤0.67, 0.32≤y3≤0.37.

[0034] Thus, by designing the distribution of the three color points that enclose the target color region on the CIE chromaticity diagram of the white light source, the target color region on the chromaticity diagram encompasses at least the color temperature range of 1800K-15000K on the blackbody radiation curve, allowing the light source to be freely adjusted within the color temperature range of 1800K-15000K. Since the color rendering index of a light source is inversely correlated with its color gamut—i.e., a larger color gamut indicates a lower color rendering index, and conversely, a lower color rendering index indicates a higher color rendering index—the design of the distribution of the first, second, and third color points P1, P2, and P3 maintains the NTSC color gamut of the light source between 45% and 55%, ensuring a color rendering index of 90 or above throughout the target color region.

[0035] In order to make the white light source meet the requirements of the above-mentioned target color region, the present invention sets the first light-emitting unit, the second light-emitting unit and the third light-emitting unit as follows:

[0036] The first light-emitting unit specifically includes a first light-emitting chip and a first fluorescent glue covering the light-emitting surface of the first light-emitting chip, wherein the first light-emitting chip is a blue light chip with a peak wavelength of 445-465nm, preferably 450-460nm. The first fluorescent glue is configured by packaging glue and a first fluorescent powder that can be excited by the first light-emitting chip. The first fluorescent powder includes at least one of a nitride fluorescent powder and a silicate fluorescent powder, wherein the nitride fluorescent powder is specifically BaSi2O2N2:Eu 2+ , silicate phosphor is specifically M2SiO 4 :Eu 2+ (M = Ca, Sr, Ba), the particle size of the first phosphor is 5-35 μm, preferably 10-25 μm. The peak wavelength of the first phosphor is 480-510 nm, preferably 485-500 nm. The encapsulating adhesive includes at least one of epoxy resin and silicone, specifically silicone. When preparing the first phosphor adhesive, the ratio of the first phosphor to the encapsulating adhesive is (0.05-0.3):1, preferably (0.1-0.2):1.

[0037] In this way, the first emission light emitted by the first light-emitting unit can form a blue light spectrum. Specifically, the blue light spectrum is a bimodal spectrum, including a first main emission peak and a first emission peak. The peak wavelength of the first main emission peak is 445-465 nm, preferably 450-460 nm, and its half-width at half maximum is 10-30 nm, preferably 15-25 nm. The first emission peak is located on the long-wave side of the first main emission peak. Here, "located on the long-wave side of the first main emission peak" is reflected in the spectrum graph as being located to the right of the first main emission peak. The peak wavelength range of the first emission peak is 480-510 nm, preferably 485-500 nm. The spectral radiation intensity of the first emission peak at its own peak wavelength accounts for greater than or equal to 20% and less than or equal to 40% of the spectral radiation intensity of the first main emission peak at its own peak wavelength. If it is less than 20%, the NTSC color gamut will increase, but the color rendering index may decrease. If it is greater than 40%, the NTSC color gamut will decrease, and the color rendering index may increase or decrease. Preferably, it is greater than or equal to 25% and less than or equal to 35%. A first trough is formed between the first main emission peak and the first emission peak. The wavelength range of the first trough is 475-485 nm. The spectral radiation intensity of the first trough accounts for greater than or equal to 15% and less than or equal to 45%, preferably greater than or equal to 20% and less than or equal to 40%, of the spectral radiation intensity of the first main emission peak at its own peak wavelength. The above blue light spectrum is mapped to form a first color point P1 on the CIE chromaticity diagram.

[0038] The second light-emitting unit includes a second light-emitting chip and a second fluorescent glue covering the light-emitting surface of the second light-emitting chip, wherein the second light-emitting chip is a blue light chip with a peak wavelength of 445-465nm, preferably 450-460nm. The second fluorescent glue is composed of a packaging glue and a second phosphor that can be excited by the second light-emitting chip. The second phosphor includes at least one of a silicate phosphor and a yttrium aluminum garnet-based phosphor, wherein the silicate phosphor is specifically M2SiO4:Eu 2+ (M=Ca, Sr, Ba), yttrium aluminum garnet-based phosphor is specifically (Ga, Al)3Al5O 12 :Ce. The second phosphor has a particle size of 5-35 μm, preferably 15-25 μm. The peak wavelength of the second phosphor is 520-545 nm, preferably 525-535 nm. The encapsulating adhesive includes at least one of epoxy resin and silicone, specifically silicone. When preparing the second phosphor adhesive, the ratio of the second phosphor to the encapsulating adhesive is (0.5-3):1, preferably (1-2):1.

[0039] In this way, the second emission light emitted by the second light-emitting unit can form a green light spectrum. Specifically, the green light spectrum is a bimodal spectrum, which includes a second main emission peak and a second emission peak. Among them, the peak wavelength of the second main emission peak is 520-545nm, preferably 525-535nm, and its half-peak width is 85-125nm, preferably 90-120nm. The second emission peak is located on the short-wave side of the second main emission peak. Here, "located on the short-wave side of the second main emission peak" is reflected in the spectrum diagram as being located on the left side of the second main emission peak. The peak wavelength of the second emission peak is 445-465nm, preferably 450-460nm. The spectral radiation intensity of the second emission peak at its own peak wavelength accounts for more than 0% and less than or equal to 30% of the spectral radiation intensity of the second main emission peak at its own peak wavelength. If it is greater than 30%, the NTSC color gamut will be reduced, and the color rendering index may increase or decrease. It is preferably greater than 0% and less than or equal to 20%. A second trough is formed between the second main emission peak and the secondary emission peak. The wavelength range of the second trough is 460-525 nm. The spectral radiation intensity of the second trough accounts for 1%-20%, preferably 1%-15%, of the spectral radiation intensity of the second main emission peak at its own peak wavelength. The above green light spectrum is mapped to form a second color point P2 on the CIE chromaticity diagram.

[0040] The third light-emitting unit includes a third light-emitting chip and a third fluorescent glue covering the light-emitting surface of the third light-emitting chip, wherein the third light-emitting chip is a blue light chip with a peak wavelength of 445-465nm, preferably 450-460nm. The third fluorescent glue is composed of packaging glue and a third phosphor that can be excited by the third light-emitting chip. The third phosphor includes red powder, which is specifically nitride red powder, and the nitride red powder is specifically (Sr,Ca)AlSiN3:Eu, (Sr,Ca,Ba,Eu)2Si5N 8-x-y O x C y At least one of the following. The third phosphor has a particle size of 5-35 μm, preferably 10-25 μm. The peak wavelength of the third phosphor is 610-640 nm, preferably 620-630 nm. The encapsulating adhesive includes at least one of epoxy resin and silicone, specifically silicone. When preparing the third phosphor adhesive, the ratio of the third phosphor to the encapsulating adhesive is (0.5-3):1, preferably (1-2):1.

[0041] In this way, the third emission light emitted by the third light-emitting unit can form a red light spectrum. Specifically, the red light spectrum is a bimodal spectrum, which includes a third main emission peak and a third emission peak. Among them, the peak wavelength of the third main emission peak is 610-640nm, preferably 620-630nm, and its half-peak width is 80-105nm, preferably 85-100nm. The third emission peak is located on the short-wave side of the third main emission peak. Here, "located on the short-wave side of the third main emission peak" is reflected in the spectrum diagram as being located on the left side of the third main emission peak. The peak wavelength of the third emission peak is 445-465nm, preferably 450-460nm. The spectral radiation intensity of the third emission peak at its peak wavelength accounts for more than 0% and less than or equal to 20% of the spectral radiation intensity of the third main emission peak at its peak wavelength. If it is greater than 20%, the NTSC color gamut will be reduced, and the color rendering index may increase or decrease. It is preferably greater than 0% and less than or equal to 10%. A third trough is formed between the third main emission peak and the tertiary emission peak. The wavelength range of the third trough is 460-620 nm. The spectral radiation intensity of the third trough accounts for 1%-10%, preferably 1%-15%, of the spectral radiation intensity of the third main emission peak at its own peak wavelength. The upper red light spectrum is mapped to the CIE chromaticity diagram to form the third color point P3.

[0042] After normalizing the above-mentioned blue light spectrum, green light spectrum and red light spectrum respectively, they are merged on the same spectrum graph to form a relative spectrum graph. The normalization method is: the spectral radiation intensity at the maximum peak of each of the blue light spectrum, green light spectrum and red light spectrum is "1", and the ratio of the spectral radiation intensity at other positions in each spectrum to the spectral radiation intensity at the maximum peak of the same spectrum is the normalized value, and then the normalized spectra are placed in the same graph. In the relative spectrum graph formed, the blue light spectrum and the green light spectrum partially overlap, and the overlapping part forms a first overlapping peak, and the half-peak width of the first overlapping peak is 20-30nm. The green light spectrum and the red light spectrum partially overlap, and the overlapping part forms a second overlapping peak, and the half-peak width of the second overlapping peak is 40-60nm. Thus, by designing the shapes of the blue light spectrum generated by the first light-emitting unit, the green light spectrum generated by the second light-emitting unit, and the red light spectrum generated by the third light-emitting unit, the mapped color points of these spectra on the CIE chromaticity diagram accurately correspond to the preset ranges of the first color point P1, the second color point P2, and the third color point P3. In these blue, green, and red light spectra, the overlap between adjacent blue and green, and green and red, reduces the gap between the maximum peak of the blue and green spectra, and also reduces the gap between the peak of the green and red spectra. This optimizes the distribution of the emission spectrum of the white light source, improving its continuity and integrity, and thus making the emission spectrum of the white light source closer to the full spectrum characteristics of natural light. This improvement not only helps improve the color rendering performance of the light source, but also expands its NTSC color gamut, resulting in a more natural and rich lighting effect.

[0043] It should be noted that the blue light spectrum, green light spectrum, and red light spectrum corresponding to the first color point P1, the second color point P2, and the third color point P3 are not unique. In addition to the above-mentioned spectral shapes, other shapes can also be set as long as the color points mapped to these spectrum diagrams in the CIE chromaticity are within the preset range of the above-mentioned first color point P1, the second color point P2, and the third color point P3.

[0044] Example

[0045] Figure 1 A schematic diagram showing the target color region of an exemplary white light source of the present invention on the CIE chromaticity diagram. Figure 1As shown, the coordinates of the first color point P1 corresponding to the blue light spectrum B are (0.1398, 0.1184), the coordinates of the second color point P2 corresponding to the green light spectrum G are (0.3909, 0.5550), and the coordinates of the third color point P3 corresponding to the red light spectrum R are (0.6337, 0.3470). The triangular target color region enclosed by the first, second, and third color points P1, P2, and P3 covers 50% of the NTSC standard color gamut, indicating that this white light source can display a wide range of colors and a relatively rich variety of colors. The first and third color points P1 and P3 are located near the endpoints of the blackbody radiation curve, respectively, while the second color point P2 is located above the blackbody radiation curve. This results in the target color region enclosed by the first, second, and third color points P1, P2, and P3 encompassing the 1600K-∞ portion of the blackbody radiation curve. In this way, the light emitted by the white light source can be freely adjusted along the blackbody radiation curve within a wide color temperature range of 1800K-15000K to achieve white balance, and the color rendering index under any color temperature condition within the range of 1800K-15000K is greater than 90, thereby realizing natural light simulation from morning to evening.

[0046] Figure 2-3 FIG1 shows a schematic relative spectrum diagram of the blue light spectrum, green light spectrum and red light spectrum formed by decomposition of the white light source in the lighting system of the present invention. Figure 2As shown, in this embodiment, the blue light spectrum B has two peaks. The peak on the left side of the figure is the first main emission peak, with a peak wavelength of 455nm and a half-width of 18nm; the peak on the right side of the figure is the first emission peak, with a peak wavelength of 490nm. The spectral radiation intensity of the first emission peak at its peak wavelength accounts for 30% of the spectral radiation intensity of the first main emission peak at its peak wavelength. A first trough is formed between the first main emission peak and the first emission peak. The spectral radiation intensity of the first trough accounts for 29% of the spectral radiation intensity of the first main emission peak at its own peak wavelength. The green light spectrum G also has two peaks. The peak on the right side of the figure is the second main emission peak, with a peak wavelength of 531nm and a half-width of 101nm; the peak on the left side of the figure is the second emission peak, with a peak wavelength of 455nm. The spectral radiation intensity of the second emission peak at its peak wavelength accounts for 6.8% of the spectral radiation intensity of the second main emission peak at its peak wavelength. A second trough is formed between the second main emission peak and the second emission peak, and the spectral radiation intensity of the second trough accounts for 5.5% of the spectral radiation intensity of the second main emission peak at its own peak wavelength. The red light spectrum R also has two peaks. The peak on the right side of the figure is the third emission peak, with a peak wavelength of 624nm and a half-peak width of 93nm; the peak on the left side of the figure is the third emission peak, with a peak wavelength of 455nm. The spectral radiation intensity of the third emission peak at its peak wavelength accounts for 3.5% of the spectral radiation intensity of the third main emission peak at its peak wavelength. A third trough is formed between the third main emission peak and the third emission peak, and the spectral radiation intensity of the third trough accounts for 3.5% of the spectral radiation intensity of the third main emission peak at its own peak wavelength.

[0047] Among them, such as Figure 3 As shown, the spectral curve of the blue light spectrum B intersects with the spectral curve of the green light spectrum G at O1, causing them to partially overlap. The overlapping portion forms a first overlapping peak S1. Intersection O1 is the peak of the first overlapping peak S1, and the half-width of the first overlapping peak S1 relative to intersection O1 is 26nm. The peak of the second overlapping peak S2 is the peak of the spectral curve of the blue light spectrum B compared to the spectral curve of the green light spectrum G compared to O2, causing the green light spectrum G and the red light spectrum R to partially overlap. The overlapping portion forms a second overlapping peak S2. Intersection O2 is the peak of the second overlapping peak S2, and the half-width of the second overlapping peak S2 relative to intersection O2 is 50nm. In this way, by creating partial overlap between the blue light spectrum B and the green light spectrum G, and between the green light spectrum G and the red light spectrum R, the continuity of the spectral distribution of the white light source emission can be improved, allowing the light source to achieve a color rendering index of 90 or above.

[0048] In actual applications, the lighting system's control unit regulates the equivalent driving current flowing into the first, second, and third light-emitting chips. By adjusting the current values, the brightness (luminous intensity) of the blue light spectrum B, green light spectrum G, and red light spectrum R is adjusted. Specifically, the control unit adjusts the proportions of the blue light spectrum B, green light spectrum G, and red light spectrum R according to the spectral ratios shown in Table 1 below to synthesize color temperatures close to the target points on the blackbody radiation curve. This allows the white light emitted by the white light source to be freely adjustable along the blackbody radiation curve between 1800K and 15000K.

[0049] Table 1

[0050]

[0051]

[0052] As shown in Table 1, when the spectral ratio of the blue light spectrum B, the green light spectrum G and the red light spectrum R is 1:(10-40):(32-180), the color temperature range of the light emitted by the white light source is 1800K-2000K; when the spectral ratio of the blue light spectrum B, the green light spectrum G and the red light spectrum R is 1:(3-40):(5-180), the color temperature range of the light emitted by the white light source is 1800K-3000K. K; when the spectral ratio of the blue light spectrum B, the green light spectrum G, and the red light spectrum R is 1:(1-5):(0.6-10), the color temperature range of the emitted light of the white light source is 3000K-6500K; when the spectral ratio of the blue light spectrum B, the green light spectrum G, and the red light spectrum R is 1:(0.3-2):(0.2-1.5), the color temperature range of the emitted light of the white light source is 6500K-15000K.

[0053] The lighting system controls the driving current of the first, second, and third light-emitting chips through a control unit, and adjusts the color temperature of the emitted light of the white light source to 15000K, 12000K, 8000K, 6500K, 5000K, 4000K, 3000K, 2700K, 2200K, 2000K, and 1800K, respectively, according to the R / G / B spectrum ratios shown in Table 2 below. Figure 4 The emission spectrum of a white light source obtained according to the spectral ratio of the blue light spectrum B, the green light spectrum G and the red light spectrum R in Table 2 below is shown.

[0054] Table 2

[0055]

[0056]

[0057] As shown in Table 2, the white light source used in the lighting system of the present invention, which mixes blue light spectrum B, green light spectrum G, and red light spectrum R in a specific ratio, produces white light with an actual color temperature that is substantially consistent with the target color temperature. This result demonstrates that within the color temperature range of 3000K to 5000K, the light source can provide high-quality illumination color, effectively simulating the lighting effects of natural light. Furthermore, the color rendering index (Ra) of the white light source exceeds 90 at 15000K, 12000K, 8000K, 6500K, 5000K, 4000K, 3000K, 2700K, 2200K, 2000K, and 1800K, and the special color rendering index (R9) exceeds 60. This demonstrates the excellent color reproduction ability of the white light source of the present invention. Under the illumination of this light source, the color of the object is very close to its color appearance in a natural light environment. It can be seen that the white light source of the present invention not only performs well in color temperature accuracy and can simulate the changes in natural light from morning to evening throughout the day, but also meets high standards in color rendering performance, thereby providing a more natural and comfortable lighting environment. At the same time, it can also meet the needs of application scenarios that have strict requirements for true color reproduction.

[0058] Comparative Example 1

[0059] Comparative Example The existing white light source is composed of R / G / B three-primary color light-emitting chips. Figure 5 The following table shows the decomposition of the emission spectrum of a white light source composed of an existing R / G / B three-primary color light-emitting chip into a blue light spectrum, a green light spectrum, and a red light spectrum. The color point, color temperature, and NTSC color gamut values ​​of the target color area surrounded by the three color points of a single light-emitting chip mapped on the CIE chromaticity diagram are shown in Table 3:

[0060] Table 3

[0061]

[0062] By setting the target color temperature to 6500K, 5000K, 4000K, 3000K, 2700K, 2200K, 2000K, and 1800K, the emission of the R / G / B primary color light-emitting chips is adjusted according to the ratio to obtain white light with different color temperatures. The color point, actual color temperature, and color rendering index of white light with different color temperatures are shown in Table 4 below:

[0063] Table 4

[0064]

[0065] As shown in Tables 3-4, Comparative Example 1 also achieves free adjustment over a wide color temperature range of 1800K-15000K by adjusting the ratio of the emitted light from the R / G / B primary color light-emitting chips. Furthermore, the NTSC color gamut of the target color region enclosed by the R / G / B primary color light-emitting chips reaches 94%. This indicates that the white light source of Comparative Example 1 can display a wider variety of colors. However, the color rendering index (Ra) of Comparative Example 1 is below 50, indicating that its color reproduction ability is poor. Compared to the white light source of Comparative Example 1, the white light source of the present invention achieves a color rendering index (Ra) greater than 90 at any color temperature within the wide color temperature range of 1800K to 15000K, while also achieving an NTSC color gamut of 45%-55%. Its overall color rendering and color reproduction capabilities are significantly superior to those of Comparative Example 1.

[0066] Comparative Example 2

[0067] Comparative Example 2 is an existing RGB white light source. Figure 6 The target color area of ​​the white light source is shown in the CIE chromaticity diagram, which is surrounded by three color points (R1, G1, and B1). The coordinates of these three color points are shown in Table 5 below:

[0068] Table 5

[0069]

[0070] By setting the target color temperature to 6500K, 5000K, 4000K, 3000K, 2700K, 2000K and 1800K, the emitted light of the white light source is adjusted to obtain white light with different color temperatures. The color point, actual color temperature and color rendering index of white light with different color temperatures are shown in Table 6 below:

[0071] Table 6

[0072]

[0073] Combined with Table 5-6 and Figure 6 It can be seen that although Comparative Example 2 can also achieve free adjustment within a wide color temperature range of 1800K-15000K by regulating the emitted light, and the color rendering index within the range of 1800K-15000K reaches 90 or above, indicating that the white light source of Comparative Example 2 has excellent color reproduction capabilities for objects; however, the color gamut enclosed by the three color points R1, G1, and B1 in Comparative Example 2 accounts for 9.5% of the standard NTSC color gamut, indicating that Comparative Example 2 can display a limited variety of colors. Compared to the white light source of Comparative Example 2, the white light source of the present invention achieves a color rendering index greater than 90 at any color temperature within the wide color temperature range of 1800K-15000K, while also achieving an NTSC color gamut of 45%-55%, and its overall color rendering performance is significantly superior to Comparative Example 2.

[0074] Comparing the embodiments of the present invention and Comparative Examples 1-2, some existing white light sources, while having a high NTSC color gamut and being able to display a richer variety of colors, have a low color rendering index, resulting in insufficient ability to reproduce the colors of objects, as shown in Comparative Example 1. Other white light sources, while having a high color rendering index and being able to more accurately reproduce the colors of objects, have a low NTSC color gamut and are limited in the variety of colors they can display, as shown in Comparative Example 2. This is because the color rendering index and color gamut of a light source are generally negatively correlated, i.e., the higher the color gamut, the lower the color rendering index; conversely, the higher the color rendering index. The white light source of the present invention, by designing the blue light spectrum B, green light spectrum G, and red light spectrum R, achieves an optimal balance between the color rendering index and the NTSC color gamut of the light emitted by the light source. This allows the light source to cover a wider color gamut while maintaining high color rendering performance, thereby providing better overall color rendering capabilities.

[0075] Compared with the prior art, the white light source and its lighting system described in the present invention set the target color area of ​​the light source in the CIE chromaticity diagram to be surrounded by three color points, and design the position distribution of the three color points so that the target color area formed by the color points at least covers the color temperature range of 1800K-15000K of the blackbody radiation curve, thereby allowing the light source to be freely adjusted within this color temperature range; and by limiting the position distribution of the above three color points, the NTSC color gamut of the light source is maintained at 45%-55%, ensuring that the color rendering index within the target color area reaches 90 or above, so that the white light source can display a relatively rich variety of colors and provide excellent color reproduction performance under any selected color temperature conditions in the range of 1800K-15000K, greatly improving the naturalness and comfort of the lighting environment and meeting the user's demand for a high-quality lighting experience.

[0076] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" refers to two or more; the terms "first", "second", "third", etc. are only used to distinguish, and are not used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. The term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0077] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A white light source for lighting, characterized in that: The color temperature of the white light source is 1800K-15000K, the color rendering index is not less than 90, and the NTSC color gamut of the white light source is 45%-55%; The target color region of the white light source satisfies: the region enclosed by the first color point, the second color point, and the third color point in the CIE chromaticity diagram; The coordinates of the first color point are (x1, y1), where 0.09≤x1≤0.19, 0.06≤y1≤0.17; The coordinates of the second color point are (x2, y2), where 0.34≤x2≤0.44, 0.51≤y2≤0.61; The coordinates of the third color point are (x3, y3), wherein 0.59≤x3≤0.67, 0.3≤y3≤0.

39.

2. The white light source according to claim 1, wherein: The coordinates of the first color point are (x1, y1), where 0.11≤x1≤0.17, 0.09≤y1≤0.14; The coordinates of the second color point are (x2, y2), where 0.36≤x2≤0.43, 0.52≤y2≤0.59; The coordinates of the third color point are (x3, y3), wherein 0.61≤x3≤0.67, 0.32≤y3≤0.

37.

3. The white light source according to claim 1, wherein: The emission spectrum of the white light source can be decomposed into a blue light spectrum, a green light spectrum and a red light spectrum; The blue light spectrum includes a first main emission peak and a first emission peak, the peak wavelength range of the first main emission peak is 445-465 nm, the first emission peak is located on the long-wave side of the first main emission peak, and the peak intensity of the first emission peak accounts for greater than or equal to 20% and less than or equal to 40% of the peak intensity of the first main emission peak; The green light spectrum includes a second main emission peak, the peak wavelength range of the second main emission peak is 520-545nm, and the half-peak width of the second main emission is 85-125nm; The red light spectrum includes a third main emission peak, the peak wavelength range of the third main emission peak is 610-640 nm, and the half-peak width of the third main emission is 80-105 nm.

4. The white light source according to claim 3, wherein: The green light spectrum also includes a second emission peak, the peak wavelength range of the second emission peak is 445-465 nm, and the peak intensity of the second emission peak accounts for more than 0% and less than or equal to 30% of the peak intensity of the second main emission peak.

5. The white light source according to claim 3, wherein: The red light spectrum also includes a third emission peak, the peak wavelength range of the third emission peak is 445-465 nm, and the peak intensity of the third emission peak accounts for more than 0% and less than or equal to 20% of the peak intensity of the third main emission peak.

6. A lighting system, characterized in that: The white light source according to any one of claims 3 to 5 comprises: A first light-emitting unit, wherein the first light-emitting unit can emit the blue light spectrum, wherein the first light-emitting unit includes: a first light-emitting chip, and a first fluorescent glue covering a light-emitting surface of the first light-emitting chip; a second light-emitting unit, wherein the second light-emitting unit can emit the green light spectrum, wherein the second light-emitting unit includes: a second light-emitting chip, and a second fluorescent glue covering a light-emitting surface of the second light-emitting chip; a third light-emitting unit, the third light-emitting unit being capable of emitting the red light spectrum, wherein the third light-emitting unit comprises: a third light-emitting chip, and A third fluorescent glue covers the light-emitting surface of the third light-emitting chip.

7. The lighting system according to claim 6, characterized in that: The system further includes a control unit, the control unit being electrically connected to the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip, respectively, and configured to adjust the spectral ratio between the blue light spectrum, the green light spectrum, and the red light spectrum by controlling the driving of the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip and adjusting the magnitude of the equivalent driving current; When the spectral ratio between the blue light spectrum, the green light spectrum and the red light spectrum is 1:(1-5):(0.6-10), the color temperature of the light emitted by the white light source is 3000K-6500K; When the spectral ratio between the blue light spectrum, the green light spectrum and the red light spectrum is 1:(3-40):(5-180), the color temperature of the light emitted by the white light source is 1800K-3000K.

8. The lighting system according to claim 6, wherein: The system further includes a control unit, the control unit being electrically connected to the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip, respectively, and configured to adjust the spectral ratio between the blue light spectrum, the green light spectrum, and the red light spectrum by controlling the driving of the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip and adjusting the magnitude of the equivalent driving current; When the spectral ratio between the blue light spectrum, the green light spectrum and the red light spectrum is 1:(0.3-2):(0.2-1.5), the color temperature of the light emitted by the white light source is 6500K-15000K.

9. The lighting system according to claim 6, wherein: The first light-emitting chip is a blue light chip, and the peak wavelength of the first light-emitting chip is 445-465nm; The first phosphor glue is made of first phosphor powder and packaging glue, and the first phosphor powder includes at least one of nitride phosphor powder and silicate phosphor powder.

10. The lighting system according to claim 6, wherein: The second light-emitting chip is a blue light chip, and the peak wavelength of the second light-emitting chip is 445-465nm; The second phosphor glue is made of second phosphor powder and packaging glue, and the second phosphor powder includes at least one of silicate phosphor powder and yttrium aluminum garnet-based phosphor powder.

11. The lighting system according to claim 6, wherein: The third light-emitting chip is a blue light chip, and the peak wavelength of the third light-emitting chip is 445-465nm; The third fluorescent glue is made of third fluorescent powder and packaging glue, and the third fluorescent powder includes nitride red powder.

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