Full spectrum light emitting device

Abstract

The embodiment of the present application provides a full spectrum light emitting device. The full spectrum light emitting device comprises a first light emitting device and a second light emitting device; the first light emitting device is a white light emitting device; the second light emitting device comprises a second blue light excitation source and a second fluorescent layer, the second fluorescent layer is covered on the second blue light excitation source, the second fluorescent layer comprises deep red light fluorescent powder, the peak wavelength of the emission spectrum of the deep red light fluorescent powder is greater than 700 nanometers, and the blue light energy of the light emitted by the second light emitting device is less than 5%; the color rendering index R1-R15 of the light emitted by the full spectrum light emitting device is greater than 90. The full spectrum light emitting device provided by the embodiment of the present application can make the full spectrum light emitting device have a relatively stable red light peak wavelength, and the spectral continuity in the range of 425-780 nanometers and the fitting degree with the standard spectrum are better.

Description

Technical Field

[0001] This invention relates to the field of lighting technology, and more particularly to a full-spectrum light-emitting device. Background Technology

[0002] A key development trend in the current LED (Light Emitting Diode) lighting field is achieving near-natural light reproduction. To evaluate color accuracy in relation to natural light, the industry has developed the IES TM-30 standard, expanding the definition of color fidelity based on the Color Rendering Index (CRI). To further calculate definitive values ​​describing the naturalness of a light source, Bridgelux created the ASD (Average Spectral Difference) standard, also known as the average spectral difference, building upon TM-30. Similar to TM-30, ASD uses the blackbody radiation curve (BBC) as a reference light source at color temperatures of 4000K and below, and standard illuminants such as D50, D57, and D65 as defined by IES, at color temperatures of 5000K and above. It measures and evaluates the difference in radiant energy between the light source and the reference light source in each 1nm interval within each spectral range, expressing the difference as a percentage. Then, the average value is taken within the human eye's sensitivity range of 425–690 nm to assess the relative naturalness of the different light sources considered. The calculation formula is shown below: .

[0003] However, the full-spectrum LED products currently on the market mainly achieve a close approximation of sunlight within the visible light range (425~690 nm) that is recognizable by the human eye. However, their emission spectrum generally suffers from energy deficiency in the deep red light region from 660 nm to 780 nm, resulting in poor fit with the continuous distribution of the solar spectrum in this band.

[0004] The most common way to enhance red light is to add long-wavelength nitride-based red phosphors. However, the peak wavelength of the emission spectrum of these phosphors is usually difficult to exceed 677 nm, making it difficult to improve the fit with the solar spectrum in such a large range of 660-780 nm.

[0005] Another approach to enhancing deep red light energy is to use a combination of white LEDs and multiple deep red or near-infrared LEDs of different wavelengths. However, this approach has inherent drawbacks: the emission spectra of deep red or near-infrared LEDs are narrow-band, and the combination will produce multiple discrete peaks in the deep red to near-infrared region, severely disrupting the continuity of the spectrum. This results in a significant difference between the synthesized spectrum and the solar spectrum (which can be measured by the ASD value), making it not a true "full-spectrum" solution.

[0006] Therefore, there is an urgent need for a full-spectrum light-emitting device that can achieve high spectral continuity and good fit with the solar spectrum across the entire 425-780nm wavelength range, especially in the 660-780nm deep red light region. Summary of the Invention

[0007] To address the problems of energy loss and poor spectral continuity in the deep red light region of existing full-spectrum products, this invention provides a full-spectrum light-emitting device.

[0008] The full-spectrum light-emitting device provided by the present invention includes: a first light-emitting device and a second light-emitting device; the first light-emitting device is a white light-emitting device; the second light-emitting device includes a second blue light excitation source and a second fluorescent layer, the second fluorescent layer covering the second blue light excitation source, the second fluorescent layer including a deep red phosphor, the peak wavelength of the emission spectrum of the deep red phosphor being greater than 700 nanometers, and the blue light energy of the light emitted by the second light-emitting device being less than 5%; the color rendering index R1-R15 of the light emitted by the full-spectrum light-emitting device is greater than 90.

[0009] The full-spectrum light-emitting device of this invention is implemented through a multi-package combination of a first light-emitting device and a second light-emitting device. A white light-emitting device providing a basic high color rendering index (CRI) spectrum is combined with a second light-emitting device specifically designed to supplement and modulate deep red light energy for spectral synthesis. By introducing deep red phosphors of specific wavelengths, the energy deficiency in the 660-780 nm wavelength range of traditional full-spectrum products is effectively compensated, significantly improving the fit between the emission spectrum and the solar spectrum in this region. The combination of the first and second light-emitting devices allows for more flexible modulation of the final spectrum, achieving both a high CRI and a better fit with the solar spectrum. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a full-spectrum light-emitting device provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic cross-sectional view of the first and second light-emitting devices in a full-spectrum light-emitting device; Figure 3 for Figure 2 Spectrum of the first light-emitting device in the image; Figure 4 for Figure 2 Spectrum of the second light-emitting device; Figure 5 for Figure 2 Synthetic spectrum of the full-spectrum light-emitting device; Figure 6 This is another structural schematic diagram of the full-spectrum light-emitting device provided in the embodiments of the present invention; Figure 7 for Figure 6 A schematic cross-sectional view of the first and second light-emitting devices in a full-spectrum light-emitting device; Figure 8 for Figure 7 Spectrum of the first light-emitting device in the image; Figure 9 for Figure 7 Spectrum of the second light-emitting device; Figure 10 for Figure 7 Synthesized spectrum of a full-spectrum light-emitting device.

[0012] Key component designations: 10. Full-spectrum light-emitting device; 11. First light-emitting device; 12. Second light-emitting device; 110. First blue light excitation source; 120. Second blue light excitation source; 210. First fluorescent layer; 220. Second fluorescent layer. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0014] It should be noted that all directional indications (such as up, down, left, right, front, back, top, bottom) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In the embodiments of the present invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0015] See Figure 1 and Figure 2This invention provides a full-spectrum light-emitting device 10, including a first light-emitting device 11 and a second light-emitting device 12; the first light-emitting device 11 is a white light-emitting device, and the second light-emitting device 12 includes a second blue light excitation source 120 and a second fluorescent layer 220. The second fluorescent layer 220 includes a deep red phosphor, the peak wavelength of the emission spectrum of the deep red phosphor is greater than 700 nanometers, and the blue light energy of the light emitted by the second light-emitting device 12 is less than 5%; the color rendering index R1-R15 of the light emitted by the full-spectrum light-emitting device 10 is greater than 90.

[0016] The first light-emitting device 11 is a white light-emitting device. Exemplarily, the light-emitting device described in prior art patent publications CN111613702A and CN117219711A can be used. In this embodiment, the color rendering index R1-R15 of the light emitted by the first light-emitting device 11 is >90. The second fluorescent layer 220 includes a deep red phosphor. The peak wavelength of the emission spectrum of the deep red phosphor is greater than 700 nanometers. For example, at least one deep red phosphor used has a peak wavelength in the range of 700-780 nanometers. Furthermore, the blue light energy of the light emitted by the second light-emitting device 12 is less than 5%. By setting the low blue light energy, the synthesized spectrum R12 of the full-spectrum light-emitting device can be greater than 90.

[0017] In this embodiment, the first light-emitting device 11 and the second light-emitting device 12 can be controlled independently. When the user needs different deep red light spectral intensities, different deep red light energies can be achieved by adjusting the current of the second light-emitting device 12. Specifically, the second light-emitting device 12 can be used to adjust the intensity of the deep red light; when the current is large, the deep red light spectrum is enhanced, and when the current is small, the deep red light spectrum is weakened. In product use, when the user needs general lighting, the second light-emitting device 12 can be turned off or turned on with a small current; when studying or working, the second light-emitting device 12 can be turned on, thus enhancing eye protection during study or work and saving energy when not needed.

[0018] Therefore, the full-spectrum light-emitting device 10 of the present invention is implemented by a multi-package combination of a first light-emitting device 11 and a second light-emitting device 12. A white light-emitting device providing a basic high color rendering index (CRI) spectrum is used to synthesize the spectrum with a second light-emitting device specifically designed to supplement and regulate deep red light energy. By introducing deep red phosphors of specific wavelengths, the energy deficiency in the 660-780 nm band of traditional full-spectrum products is effectively compensated, significantly improving the fit between the emission spectrum and the solar spectrum in this region. Furthermore, the light emitted by the full-spectrum light-emitting device 10 of this embodiment has a CRI (R1-R15) > 90. The light source emitted by the full-spectrum light-emitting device 10 can more accurately reproduce the true colors of objects, making them appear more vibrant and vivid, improving the visual experience, reducing color difference, and helping to reduce misjudgment of color by the human eye. Long-term work or life in a low CRI environment may lead to decreased vision; a high CRI light source helps protect eyesight and reduce visual fatigue. In addition, the combination of the first light-emitting device 11 and the second light-emitting device 12 allows for more flexible modulation of the final spectrum, achieving a high CRI while obtaining a better fit with the solar spectrum.

[0019] Compared to existing technologies that use long-wavelength nitride red phosphors for a wide-band full-spectrum application, the deep red phosphor with a peak wavelength greater than 700 nm selected in this invention has better excitation efficiency, avoiding excessive reduction in the brightness of the full-spectrum light-emitting device 10. Furthermore, it has a relatively stable red peak wavelength, avoiding fluctuations in peak wavelength and brightness caused by blue chip wavelength variations (typically ±2.5 nm) and phosphor coating uniformity during production, thus improving product consistency and stability. Compared to existing technologies that use white LEDs and multiple deep red or near-infrared LEDs to form a wide-band full-spectrum application, the full-spectrum light-emitting device of this invention exhibits better spectral continuity in the 425-780 nm range, better fit with the standard spectrum, and can achieve an ASD < 25%. In preferred embodiments, the ASD value in the 425-780 nm band can be as low as 10% or less, achieving a close fit to the solar spectrum. In this embodiment, the peak wavelength of the red light emitted by the full-spectrum light-emitting device 10 is between 630 and 660 nanometers, and there is one or more peak inflection points between 700 and 780 nanometers.

[0020] The light emitted by the full-spectrum light-emitting device 10 in this embodiment of the invention has a color rendering index (R1-R15) > 90. The light source emitted by the full-spectrum light-emitting device 10 can more accurately reproduce the true color of an object, making the object look more vivid and lifelike. This can improve the visual experience, reduce color difference, and help reduce misjudgment of color by the human eye. Working or living in a low color rendering index environment for a long time may lead to decreased vision. A light source with a high color rendering index helps protect vision and reduce visual fatigue.

[0021] In such Figure 1 and Figure 2 In the illustrated embodiment, the first light-emitting device 11 may include, for example, a first blue light excitation source 110 and a first phosphor layer 210. The first phosphor layer 210 covers the first blue light excitation source 110. In this invention, the wavelength of the excitation light generated by the first blue light excitation source 110 is in the range of 425 nm to 475 nm, and is broadband excitation light. "Broadband" means that the full width at half maximum (FWHM) of the excitation light spectrum is at least 25 nm, preferably 30 nm or more. The first blue light excitation source 110 may include a broadband blue LED, whose active region has at least two different sets of quantum wells, each set of quantum wells producing different blue light emission; the first blue light excitation source 110 may also include a combination of multiple narrowband blue LED chips of different wavelengths. Using the first blue light excitation source 110 allows the light generated by the light-emitting device to be closer to natural light in the blue (420 nm to 500 nm) region of the spectrum. The first phosphor layer 210 may include yellow-green phosphor and nitride red phosphor. Yellow-green phosphors refer to phosphors with peak wavelengths in the range of 500nm to 555nm, and can be, for example, aluminates, silicates, or oxynitrides, specifically selected from one or more of GaYAG, LuAG, Silicate, and β-SiAlON. Nitride red phosphors mainly refer to phosphors with peak wavelengths between 600nm and 677nm, whose chemical formula can be abbreviated as CASN (containing (Sr,Ca)AlSiN3:Eu). These yellow-green and nitride red phosphors are primarily used to receive light emitted from the first blue light excitation source 110 and to generate basic white light that closely approximates sunlight within a specific range.

[0022] In one embodiment of this invention, the deep red phosphor with a peak wavelength greater than 700 nm selected by the present invention may include, for example, one or more of a first deep red phosphor, a second deep red phosphor, and a third deep red phosphor. Specifically, the peak wavelength of the emission spectrum of the first deep red phosphor is 710-720 nm, the peak wavelength of the emission spectrum of the second deep red phosphor is 730-740 nm, and the peak wavelength of the emission spectrum of the third deep red phosphor is 760-770 nm. In the first embodiment of this invention, the mass percentages of the first deep red phosphor, the second deep red phosphor, and the third deep red phosphor are 14.41%, 36.04%, and 49.55%, respectively. In this embodiment, the second blue light excitation source 120 includes a binary blue light chip. This binary blue light chip refers to a blue light chip produced alongside general lighting blue light chips but not typically selected for general lighting applications. The wavelength range of the binary blue light chip includes 445-447 nm, 447-450 nm, 460-460 nm, or 462-462.5 nm. To avoid affecting the energy distribution of the full spectrum in the blue light portion, the blue light emitted by the second light-emitting device 12 needs to be controlled, with a residual wavelength of <5%. Therefore, the requirements for the selection of the blue light chip are not high; some binary blue light chips not commonly used in conventional lighting products can be selected, which can save costs, but this is not a limitation.

[0023] To facilitate understanding of the effects of the full-spectrum light-emitting device 10 provided in the above embodiments, Embodiment 1 is used as an example below, with detailed explanation in conjunction with the spectral diagram. In Embodiment 1, the first light-emitting device 11 can be, for example, a commercially available full-spectrum white light product with a color temperature of 4000K. The second blue light excitation source 120 in the second light-emitting device 12 may include a blue light chip. The mass percentages of the first deep red phosphor, the second deep red phosphor, and the third deep red phosphor are 14.41%, 36.04%, and 49.55%, respectively. Through the separate setting of the second light-emitting device 12, and because the normalized intensity of the light emitted by the second light-emitting device 12 in the blue light portion is less than 5%, the color rendering index R12 of the synthesized spectrum can be greater than 90. The second light-emitting device 12 can be used to adjust the intensity of the deep red light; when the current is large, the deep red light spectrum is enhanced, and when the current is small, the deep red light spectrum is weakened. See also... Figure 3 , Figure 3 The spectrum of the first light-emitting device 11 is shown in the image. Figure 4 , Figure 4 This is the spectrum of the second light-emitting device 12. See also... Figure 5 , Figure 5The image shows the synthesized spectrum of the full-spectrum light-emitting device 10, which is synthesized from the first light-emitting device 11 and the second light-emitting device 12. The emission spectrum of the full-spectrum light-emitting device 10 has a red light peak between 630-660 nm and at least one peak inflection point between 700-780 nm. In this embodiment, the light emitted by the first light-emitting device 11 has an ASD of 27.5% in the range of 425-780 nm, and the light synthesized from the first light-emitting device 11 and the second light-emitting device 12 has an ASD of 15.17% in the range of 425-780 nm.

[0024] See Figure 6 and Figure 7 In another embodiment of the present invention, the color rendering index R9 of the light emitted by the first light-emitting device 11 is ≤95, and the second fluorescent layer 220 further includes nitride red powder. In this embodiment, the first light-emitting device 11 is also a white light-emitting device, but in this embodiment, it is preferable to select a light color rendering index R9 ≤95, for example, 80 < R9 ≤ 92. Under the TM-30 standard, Rcs,hj (saturation shift of the j-th hue interval) is -1.9%, that is, the saturation of Rcs,hj is less than -1%. Specifically, the first light-emitting device 11 is more preferably a light-emitting device with low saturation R9, that is, the first light-emitting device 11 is preferably a white light-emitting device with R9 in an unsaturated state; one measurement index of R9 unsaturation can be that R9 decreases as the current increases under continuous current, that is, when the first light-emitting device 11 is lit up, the current is applied from small to large. If R9 gradually decreases, it means that the R9 of the first light-emitting device 11 is in an unsaturated state, rather than an oversaturated state. By separately configuring the second light-emitting device 12, the intensity of the deep red light can be adjusted. When the current is large, the deep red light spectrum is enhanced, and when the current is small, the deep red light spectrum is weakened. Since the phosphor in the second light-emitting device 12 includes nitride red phosphor and deep red phosphor, the color rendering index R9 of the light emitted by the first light-emitting device 11 is ≤ 95, thereby making the color rendering index R1-R15 of the light emitted by the full-spectrum light-emitting device 10 > 90. Due to the addition of nitride red phosphor, the amount of deep red phosphor can be reduced, the cost will be reduced, and the blue light energy can be easily reduced to below 5%.

[0025] To achieve a low-saturation state of R9 in the first light-emitting device 11, the proportion of phosphor in the first fluorescent layer 210 can be adjusted. Specifically, the first light-emitting device 11 includes a first blue light excitation source 110 and a first fluorescent layer 210, which covers the first blue light excitation source 110. The first fluorescent layer 210 includes yellow-green phosphor and nitride red phosphor. Further, the yellow-green phosphor includes first yellow-green phosphor and second yellow-green phosphor. The peak wavelength of the emission spectrum of the first yellow-green phosphor is 510~520 nm, the peak wavelength of the emission spectrum of the second yellow-green phosphor is 520~550 nm, and the peak wavelength of the emission spectrum of the nitride red phosphor is 645~655 nm. The mass proportion of the first yellow-green phosphor is greater than that of the second yellow-green phosphor. By adjusting the proportion of the first yellow-green phosphor and the second yellow-green phosphor, the R9 of the first light-emitting device 11 decreases with increasing continuous current, thereby keeping R9 in an unsaturated state.

[0026] See Figure 7 The second light-emitting device 12 includes a second blue light excitation source 120 and a second fluorescent layer 220. The second fluorescent layer 220 includes a deep red phosphor and a nitride red phosphor. The peak wavelength of the emission spectrum of the deep red phosphor is greater than 700 nm, and the blue light energy emitted by the second light-emitting device 12 is less than 5%. The luminous intensity of the second light-emitting device 12 at 630 nm is greater than 1% and less than 3%. By controlling this portion of red light, it can be ensured that the R9 of the entire full-spectrum light-emitting device is greater than 90 after combining with the red light of the first light-emitting device 11. When the current is large, the deep red light spectrum is enhanced; when the current is small, the deep red light spectrum is weakened. Because the second fluorescent layer 220 is more advanced than the first light-emitting device 11, the second light-emitting device 120 is more advanced than the second light-emitting device 120. Figure 1 and Figure 2 The embodiment uses nitride red phosphor, which has better absorption efficiency for blue light, so less deep red phosphor can be used, reducing costs, and blue light is easier to reduce to below 5%. The red light energy of the first light-emitting device 11 needs to be adjusted according to the nitride red phosphor in the second light-emitting device 12, and the two need to work together.

[0027] Furthermore, the deep red phosphor in the second fluorescent layer 220 is one or more of a first deep red phosphor and a second deep red phosphor. The peak wavelength of the emission spectrum of the first deep red phosphor is 720~730 nm, and the peak wavelength of the emission spectrum of the second deep red phosphor is 760~770 nm. In order to ensure that the luminous intensity of the second light-emitting device 12 at 630 nm is greater than 1% and less than 3%, the peak wavelength of the emission spectrum of the nitride red phosphor is preferably 670~680 nm.

[0028] To facilitate understanding of the effect of the full-spectrum light-emitting device 10 provided in the above embodiments, Embodiment 2 is used as an example below, with detailed explanation in conjunction with the spectral diagram. In Embodiment 2, the mass percentages of the first yellow-green phosphor, the second yellow-green phosphor, and the nitride red phosphor in the first phosphor layer 210 of the first light-emitting device 11 are 54.7%, 35.5%, and 9.9%, respectively; the mass percentages of the nitride red phosphor, the first deep red phosphor, and the second deep red phosphor in the second phosphor layer 220 are 0.17%, 49.91%, and 49.91%, respectively. See also Figure 8 , Figure 8 The spectrum of the first light-emitting device 11 is shown in the image. Figure 9 , Figure 9 This is the spectrum of the second light-emitting device 12. See also... Figure 10 , Figure 10 The image shows the synthesized spectrum of the full-spectrum light-emitting device 10, which is synthesized from the first light-emitting device 11 and the second light-emitting device 12. The emission spectrum of the full-spectrum light-emitting device 10 has a red light peak between 630-660 nm and at least one peak inflection point between 700-780 nm. In this second embodiment, the light emitted by the first light-emitting device 11 has an ASD of 27.92% and an R9 of 86.5 in the range of 425-780 nm. The light synthesized from the first light-emitting device 11 and the second light-emitting device 12 has an ASD of 12.1% in the range of 425-780 nm.

[0029] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of the present invention. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of the invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-spectrum light-emitting device, characterized in that, include: First light-emitting device and second light-emitting device; The first light-emitting device is a white light-emitting device; The second light-emitting device includes a second blue light excitation source and a second fluorescent layer. The second fluorescent layer covers the second blue light excitation source. The second fluorescent layer includes a deep red phosphor. The peak wavelength of the emission spectrum of the deep red phosphor is greater than 700 nanometers, and the blue light energy of the light emitted by the second light-emitting device is less than 5%. The color rendering index R1-R15 of the light emitted by the full-spectrum light-emitting device is greater than 90.

2. The full-spectrum light-emitting device as described in claim 1, characterized in that, The first light-emitting device emits light with a color rendering index R9 ≤ 95, and the second fluorescent layer also includes nitride red powder.

3. The full-spectrum light-emitting device as described in claim 1 or 2, characterized in that, The peak wavelength of the red light emitted by the full-spectrum light-emitting device is between 630 and 660 nanometers, and there is one or more peak inflection points between 700 and 780 nanometers.

4. The full-spectrum light-emitting device as described in claim 3, characterized in that, The light emitted by the full-spectrum light-emitting device has an ASD of <25% in the range of 425~780 nanometers.

5. The full-spectrum light-emitting device as described in claim 1, characterized in that, The deep red phosphor is one or more of a first deep red phosphor, a second deep red phosphor, and a third deep red phosphor. The peak wavelength of the emission spectrum of the first deep red phosphor is 710-720 nm, the peak wavelength of the emission spectrum of the second deep red phosphor is 730-740 nm, and the peak wavelength of the emission spectrum of the third deep red phosphor is 760-770 nm.

6. The full-spectrum light-emitting device as described in claim 5, characterized in that, The wavelength range of the second blue light excitation source is 445-447 nm, 447-450 nm, 460-460 nm or 462-462.5 nm.

7. The full-spectrum light-emitting device as described in claim 2, characterized in that, The color rendering index of the light emitted by the first light-emitting device is 80 < R9 ≤ 92.

8. The full-spectrum light-emitting device as described in claim 7, characterized in that, The first light-emitting device includes a first blue light excitation source and a first fluorescent layer, the first fluorescent layer covering the blue light excitation source, and the first fluorescent layer includes yellow-green phosphor and nitride red phosphor.

9. The full-spectrum light-emitting device as described in claim 8, characterized in that, The yellow-green powder includes a first yellow-green powder and a second yellow-green powder. The peak wavelength of the emission spectrum of the first yellow-green powder is 510~520 nm, and the peak wavelength of the emission spectrum of the second yellow-green powder is 520~550 nm. The mass ratio of the first yellow-green powder is greater than that of the second yellow-green powder.

10. The full-spectrum light-emitting device as described in claim 2, characterized in that, The deep red phosphor is one or more of a first deep red phosphor and a second deep red phosphor. The peak wavelength of the emission spectrum of the first deep red phosphor is 720-730 nm, the peak wavelength of the emission spectrum of the second deep red phosphor is 760-770 nm, and the peak wavelength of the emission spectrum of the nitride red phosphor is 670-680 nm.

11. The full-spectrum light-emitting device as described in claim 1, characterized in that, The color rendering index R9 of the light emitted by the first light-emitting device decreases as the current increases.

Images