Light source device and lamp

Abstract

The invention provides a light source device and a lamp, a light emitting chip of the light source device is used for outputting first color light, the first color light is blue light, and first sub-color light and second sub-color light of the first color light are arranged along a continuous and progressive increasing wave band; the fluorescent structure is configured to absorb the first sub-color light and excite second color light based on the first sub-color light, and the wave band of the second color light is larger than that of the first color light; the fluorescent structure is further configured to transmit the second sub-color light so as to output mixed color light of the mixed second sub-color light and the second color light; the blue light chip is adopted to output the mixed color light, the cost can be reduced, the first color light is divided into the first sub-color light and the second sub-color light, the first sub-color light is used for exciting the second color light such as yellow-green light and dark red light, the second sub-color light directly emits out to compensate for the blue light wave band which is originally lost in the mixed color light, and the light efficiency is improved. And the color rendering index of the mixed color light can be improved.

Description

Technical Field

[0001] This application belongs to the field of lighting technology, and particularly relates to a light source device and a lighting fixture. Background Technology

[0002] In the lighting field, LED lamps are becoming increasingly widely used. LED lights primarily emit light through semiconductor chips. When the chip is powered on, it undergoes a series of energy conversions to produce light. Different chip materials can emit different colors of light. In practical applications, specific light colors are often achieved by combining chips with phosphors.

[0003] However, existing light source devices have significant shortcomings in terms of color rendering index (CRI). In nighttime lighting scenarios, light sources with low CRI can cause color distortion of objects, making it difficult for people to distinguish the true colors of objects, such as medicine labels and the colors of obstacles, posing safety hazards. When providing lighting for reading, the light source cannot accurately reproduce the colors of charts and text in books, affecting the visual experience and information acquisition. Summary of the Invention

[0004] The purpose of this application is to provide a light source device and lamp that aims to solve the problem of low color rendering index in traditional light source devices.

[0005] A first aspect of this application provides a light source device, the light source device comprising:

[0006] A light-emitting chip is used to output a first color light, which is blue light. The first color light includes a first sub-color light and a second sub-color light, which are set along a continuous and increasing wavelength band.

[0007] A fluorescent structure is covered on the light-emitting chip. The fluorescent structure is configured to absorb the first sub-color light and excite a second color light based on the first sub-color light. The color of the second color light is different from the color of the first color light, and the wavelength of the second color light is greater than that of the first color light. The fluorescent structure is also configured to transmit the second sub-color light so as to output a mixed color light of the second sub-color light and the second color light.

[0008] In some embodiments of this application, the peak wavelength of the first color light is 470nm-480nm.

[0009] In some embodiments of this application, the wavelength λ1 of the first sub-color light satisfies the following condition: λ1≤480nm; the wavelength λ2 of the second sub-color light satisfies the following condition: λ2>480nm.

[0010] In some embodiments of this application, the wavelength of the second sub-color light covers the first wavelength band, which is 480nm-500nm.

[0011] In some embodiments of this application, the second color light includes yellow-green light and deep red light, and the second sub-color light, the yellow-green light and the deep red light form a continuous full spectrum.

[0012] In some embodiments of this application, the fluorescent structure includes a first phosphor and a second phosphor. The first phosphor is a green phosphor, which is excited by a first sub-color light to output the yellow-green light. The second phosphor is a red phosphor, which is excited by the first sub-color light to output the deep red light.

[0013] In some embodiments of this application, the peak wavelength of the yellow-green light is 520nm-530nm; the peak wavelength of the deep red light is 655nm-665nm.

[0014] In some embodiments of this application, the half-width λ of the yellow-green light HWW1 The following condition must be met: λ HWW1 ≥120nm; the half-width λ of the deep red light HWW2 The following condition must be met: λ HWW2 ≥80nm.

[0015] In some embodiments of this application, the mixed color light is golden yellow light.

[0016] A second aspect of this application also provides a luminaire comprising the aforementioned light source device.

[0017] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The above-mentioned light source device and lamp include a light-emitting chip and a fluorescent structure; the light-emitting chip is used to output a first color light, the first color light is blue light, the first color light includes a first sub-color light and a second sub-color light, the first sub-color light and the second sub-color light are set along a continuous and increasing wavelength band; the fluorescent structure covers the light-emitting chip, the fluorescent structure is configured to absorb the first sub-color light, and excite a second color light based on the first sub-color light, the color of the second color light is different from the color of the first color light, and the wavelength band of the second color light is larger than that of the first color light; the fluorescent structure is also configured to transmit the second sub-color light, so as to output a mixed color light of the second sub-color light and the second color light; the use of a blue light chip to output mixed color light in this application is beneficial to reducing costs, and the first color light in this application is divided into a first sub-color light and a second sub-color light, the first sub-color light is used to excite the second color light such as yellow-green light and deep red light, and the second sub-color light is directly emitted to make up for the blue light band that should be missing in the mixed color light, which is beneficial to improving the color rendering index of the mixed color light. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a light source device provided in an embodiment of this application;

[0019] Figure 2 This is a spectral distribution diagram of a light source device provided in an embodiment of this application.

[0020] Specific element symbol explanation: 100-light-emitting chip, 200-fluorescent structure, 300-support. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] It's important to know that in the modern lighting field, LED light sources are widely used in various lamps due to their advantages such as energy saving and long lifespan. Their working principle is based on the energy conversion that occurs when a semiconductor chip is powered on, combined with phosphor materials, to achieve light output of different colors. Among them, golden yellow LEDs, due to their soft light color that closely resembles natural light, are receiving considerable attention in healthy lighting scenarios, such as nightlights and eye-protecting desk lamps.

[0026] In related technologies, such as golden LED light source devices, the low color rendering index of the light source causes serious color distortion of objects when illuminated at low light levels at night. For example, it is difficult to distinguish the true colors of medicine packaging and switch signs, which poses a safety hazard. In reading and office scenarios, traditional light sources cannot accurately reproduce the colors of the text and images in books and documents, affecting visual comfort and information recognition efficiency.

[0027] Based on this, this application improves the relevant light source devices and lamps.

[0028] Please see Figure 1 , Figure 1 A schematic diagram of the structure of the light source device provided in this embodiment is shown. The light source device of this application embodiment includes a light-emitting chip 100 and a fluorescent structure 200. The light-emitting chip 100 is used to output a first color light, which is blue light. The first color light includes a first sub-color light and a second sub-color light, which are arranged along continuous and increasing wavelengths. The fluorescent structure 200 covers the light-emitting chip 100. The fluorescent structure 200 is configured to absorb the first sub-color light and excite a second color light based on the first sub-color light. The color of the second color light is different from the color of the first color light, and the wavelength of the second color light is greater than that of the first color light. The fluorescent structure 200 is also configured to transmit the second sub-color light to output a mixed color light of the second sub-color light and the second color light.

[0029] It needs to be explained that, such as Figure 1 As shown, the light source device includes a support 300 with a groove. A light-emitting chip 100 is disposed on the bottom wall of the groove, and a fluorescent structure 200 fills the groove and covers the light-emitting chip 100. The light-emitting chip 100 is a semiconductor element that outputs light of a specific color through electroluminescence; in this embodiment, it outputs a first color light (blue light). The first sub-color light and the second sub-color light are two consecutive and increasing spectral components constituting blue light, used to excite the fluorescent structure 200 and directly participate in light mixing, respectively. The fluorescent structure 200 is an optical material layer covering the surface of the light-emitting chip 100, capable of absorbing light of a specific wavelength and exciting second color light of different wavelengths, while allowing some light to pass through. The second color light is the light excited by the fluorescent structure 200 after absorbing the first sub-color light, and its wavelength range is greater than that of the first color light. The mixed color light is the final output light formed by mixing the second sub-color light transmitted through the fluorescent structure 200 with the excited second color light.

[0030] It is understood that this embodiment employs a light-emitting chip 100 and a fluorescent structure 200. The light-emitting chip 100 outputs blue light comprising a first sub-color light and a second sub-color light in continuously increasing wavelength bands. The fluorescent structure 200 absorbs the first sub-color light and excites the second sub-color light, while simultaneously transmitting the second sub-color light; the two mix to form a mixed-color light. Using a blue light chip as the basic light source is beneficial for reducing production costs compared to traditional special color chips. Dividing blue light into two functional bands—excitation and transmission—can both generate new spectral components by exciting the fluorescent structure 200 and retain some blue light to directly participate in light mixing, achieving a more complete spectral distribution, which is beneficial for improving the color rendering ability of the light source and accurately reproducing the true color of objects. In addition, the reasonable allocation of the blue light band avoids the spectral loss problem caused by suppressing harmful blue light in traditional solutions, optimizing the spectral composition while ensuring low blue light hazards, which is beneficial for protecting human eye health. The natural mixing of the two light sources in space helps improve the uniformity of illumination, avoids problems such as local color spots, and improves the overall lighting effect.

[0031] In some embodiments of this application, the peak wavelength of the first color light is 470nm-480nm.

[0032] It is understood that blue light with wavelengths below 460nm is considered harmful blue light. In this embodiment, the peak wavelength of the first color light is set between 470nm and 480nm, which is higher than the peak wavelength in the prior art, which helps to reduce the proportion of harmful blue light.

[0033] In some embodiments of this application, the wavelength λ1 of the first sub-color light satisfies the following condition: λ1≤480nm; the wavelength λ2 of the second sub-color light satisfies the following condition: λ2>480nm.

[0034] Understandably, this band division allows the shorter wavelength first sub-color light (≤480nm) to be preferentially absorbed by the fluorescent structure 200, exciting the generation of the second color light, while the longer wavelength second sub-color light (>480nm) directly participates in light mixing through the fluorescent structure 200. Since blue light with wavelengths ≤480nm has relatively high energy and may pose a potential hazard to the human eye, this embodiment uses this wavelength band to excite the fluorescent structure 200, effectively reducing the proportion of short-wavelength blue light in the final output light, thus mitigating the risk of harmful blue light damage to the human eye. Simultaneously, the second sub-color light with wavelengths >480nm has lower energy and is closer to the harmless blue light range; its direct participation in light mixing can supplement the long-wavelength blue light component in the spectrum. While reducing harmful blue light, it maintains the overall spectral integrity of the light source, avoiding a decrease in the color rendering index due to excessive blue light filtering. Therefore, while ensuring human eye health, it still achieves a high color rendering illumination effect.

[0035] In some embodiments of this application, the wavelength of the second sub-color light covers the first wavelength band, which is 480nm-500nm.

[0036] Understandably, by covering the 480nm-500nm wavelength range with the second sub-color light, the spectral gap in this band in traditional blue light excitation schemes can be effectively filled, making the spectral distribution of the mixed color light more continuous and smooth, closer to the spectral characteristics of natural light. This is beneficial for further improving the color rendering index of the light source, especially its ability to reproduce the colors of cyan and blue-green objects. Furthermore, the blue light energy in the 480nm-500nm band is relatively low, posing less potential harm to the human eye. This embodiment, by selectively retaining the blue light component in this range, reduces the proportion of harmful blue light <480nm while ensuring that the light source has sufficient blue light component for mixing, balancing the needs of healthy lighting and color rendering performance. Simultaneously, blue light in the 480nm-500nm band has a positive impact on human color perception and visual comfort. After the second sub-color light covering this band participates in the mixing, it can improve the color coordinate distribution of the light source, reduce color shift, make the light softer and more natural, and reduce eye fatigue caused by prolonged illumination.

[0037] In some embodiments of this application, the second color light includes yellow-green light and deep red light, and the second sub-color light, yellow-green light and deep red light form a continuous full spectrum.

[0038] Understandably, the second sub-color light, with its own wavelength characteristics, seamlessly connects with yellow-green and deep red light to jointly construct a continuous spectrum covering the entire visible light range. This formation of a continuous full spectrum greatly simulates the spectral characteristics of natural light, facilitating the accurate reproduction of the true colors of objects under natural light, significantly improving the color rendering performance of the light source, and meeting the application requirements for high color rendering indexes. Furthermore, the continuous spectrum avoids the color shift problem caused by the incomplete spectrum of traditional light sources, effectively reducing visual fatigue. At the same time, the uniform energy distribution of the full spectrum also helps to improve the softness and comfort of the light, bringing users a healthier and higher-quality lighting experience.

[0039] In some embodiments of this application, the fluorescent structure 200 includes a first phosphor and a second phosphor. The first phosphor is a green phosphor, which is excited by a first sub-color light to output yellow-green light. The second phosphor is a red phosphor, which is excited by a first sub-color light to output deep red light.

[0040] Understandably, when the first sub-color light in the first color light (blue light) output by the light-emitting chip 100 illuminates the green phosphor, the green phosphor absorbs the energy of the first sub-color light and is excited to emit yellow-green light. The first sub-color light also interacts with the red phosphor, which absorbs the energy of the first sub-color light and emits deep red light. The first sub-color light excites the green phosphor to produce yellow-green light, and the first sub-color light excites the red phosphor to produce deep red light. These two colors mix with the second sub-color light that directly passes through the fluorescent structure 200 to form a complete spectrum. This approach improves the richness and continuity of the spectrum, providing more comprehensive coverage of the visible light band compared to a single phosphor solution, thus significantly improving the color rendering index of the light source and more accurately reproducing object colors. Simultaneously, utilizing the efficient absorption and conversion of specific wavelengths of blue light by different phosphors helps reduce unused blue light energy and mitigate the potential impact of harmful blue light, providing a healthier lighting environment for users while ensuring high color rendering performance.

[0041] In some embodiments of this application, the peak wavelength of yellow-green light is 520nm-530nm; the peak wavelength of deep red light is 655nm-665nm.

[0042] Understandably, the peak wavelength characteristics of yellow-green light effectively supplement the yellow-green band of the spectrum, while deep red light precisely enhances the red spectral components, together with the second sub-color light to construct a continuous and balanced full-spectrum system. This combination of wavelengths is beneficial for highly reproducing the true colors of objects, especially significantly improving the color rendering performance of yellow-green and red objects, thus meeting the requirements for a high color rendering index.

[0043] In some embodiments of this application, the half-width λ of yellow-green light HWW1 The following condition must be met: λ HWW1 ≥120nm; half-width λ of deep red light HWW2 The following condition must be met: λ HWW2 ≥80nm.

[0044] Understandably, yellow-green and deep red light have relatively wide spectral bandwidths, which effectively prevent obvious peaks or gaps in the spectrum when mixed with the second sub-color light. A wider half-width (WWHM) means that the spectral energy distribution of yellow-green and deep red light is more gradual and continuous. Yellow-green light has a WWHM ≥ 120nm, which can fully cover the yellow-green spectral region and transition naturally when connected with other spectral components; deep red light has a WWHM ≥ 80nm, ensuring the integrity and uniformity of the long-wavelength spectrum. When these two light sources are mixed with the second sub-color light to form a mixed-color light, it helps to further optimize spectral continuity and uniformity, significantly improving the color rendering performance of the light source and making the color reproduction of objects more realistic and delicate. At the same time, the gradual spectral energy distribution reduces the concentration of light intensity in specific wavelengths, avoiding eye stimulation caused by excessively strong local spectra, and also helps to reduce visual fatigue, providing users with a more comfortable and healthier lighting experience.

[0045] In some embodiments of this application, the mixed color light is golden yellow light.

[0046] It is important to know that golden yellow LED lights are irreplaceable in the field of healthy lighting, such as nightlights and eye-protecting desk lamps. These lights have the following requirements: low-intensity nighttime lighting (≤50 lx) must meet the following criteria: (1) suppress harmful blue light below 460 nm (reduce melatonin secretion interference); (2) have a color rendering index > 80 (avoid misjudging object colors when getting up at night, such as medicine labels or ground obstacles). However, existing traditional 560-590nm chip light sources have a color rendering index of only 30, resulting in severe color distortion of objects (e.g., red pills appear black).

[0047] When using a desk lamp for reading illumination (300-500 lx), the following conditions must be met simultaneously: (1) retinal protection (RPE cell damage threshold < 0.1 J / cm²). 2 (1) Ra > 90 (accurately reproduces the colors of the charts and graphs in the book); (2) uniform light mixing (avoids local color spots that cause visual fatigue); however, the existing silicon-based yellow light (560nm) + red light (620nm) mixed light LED has a display index of 70 and has red / yellow light spots (color tolerance SDCM > 5), which can easily cause headaches for students if used for a long time. However, the cost of yellow light chips is relatively high, which is not conducive to the promotion of the product.

[0048] Current golden yellow LED lighting fixtures sacrifice the blue light spectrum to reduce harmful blue light, resulting in a failure to improve the color rendering index (due to the lack of blue light spectral components). Existing golden yellow LED technology cannot simultaneously meet the requirements of high color rendering index (>90), low harmful blue light, uniform light mixing, and low cost.

[0049] Understandably, in this embodiment, the second sub-color light supplements the blue light component in the 480nm-500nm range, the yellow-green light covers the yellow-green band with a peak at 520nm-530nm, and the deep red light strengthens the long-wavelength spectrum in the 655nm-665nm range. After mixing, the spectral energy is concentrated in the mid-to-long-wavelength region, and the proportion of short-wavelength blue light is reduced, forming a golden light with low blue light hazard characteristics. This golden light not only has a high color rendering index and can truly reproduce the colors of objects, but also, due to its spectrum being close to the warm color tone characteristics of natural light, the light is soft and not dazzling, which is conducive to creating a comfortable lighting atmosphere. In healthy lighting scenarios, such as night lights and eye-protecting desk lamps, golden light can reduce interference with the human body's physiological rhythms and reduce visual fatigue, achieving a synergistic optimization of health and lighting effects. At the same time, the solution of using inexpensive blue light chips to excite phosphors to obtain golden light is more conducive to promotion and can achieve a color rendering index of over 95.

[0050] In some embodiments of this application, please refer to Figure 2 , Figure 2The spectral distribution diagram of the light source device provided in this embodiment is shown; as follows: Figure 2 As shown, the wavelength range of the chip's leakage peak is 480-500nm, the green phosphor peak is 520-530nm, and the red phosphor peak is 655-665nm. This embodiment uses a 2835PCT substrate 300 and a blue light chip with a peak wavelength of 472nm-475nm. The fluorescent structure 200 uses a green phosphor with an emission peak of 520nm and a red nitride phosphor with an emission peak of 665nm. Figure 2 In the spectrum shown, the harmful blue light component of the mixed color light output by the light source device in this embodiment is less than 0.5%, the color temperature is 1800K, the Ra (color rendering index) is 95, and the luminous efficacy is 120lm / W.

[0051] Furthermore, in order to better implement the light source device in any of the above embodiments, based on the above light source device, this application embodiment also provides a lamp, which includes the above light source device.

[0052] In some embodiments, the light fixture is a night light or an eye-protecting desk lamp.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0054] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0055] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0056] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0057] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application, and should all be included within the protection scope of this application.

Claims

1. A light source device, characterized in that, The light source device includes: A light-emitting chip is used to output a first color light, which is blue light. The first color light includes a first sub-color light and a second sub-color light, which are set along a continuous and increasing wavelength band. A fluorescent structure is covered on the light-emitting chip. The fluorescent structure is configured to absorb the first sub-color light and excite a second color light based on the first sub-color light. The color of the second color light is different from the color of the first color light, and the wavelength of the second color light is greater than that of the first color light. The fluorescent structure is also configured to transmit the second sub-color light so as to output a mixed color light of the second sub-color light and the second color light.

2. The light source device according to claim 1, characterized in that, The peak wavelength of the first color light is 470nm-480nm.

3. The light source device according to claim 2, characterized in that, The wavelength λ1 of the first sub-color light satisfies the following condition: λ1≤480nm; the wavelength λ2 of the second sub-color light satisfies the following condition: λ2>480nm.

4. The light source device according to claim 3, characterized in that, The second sub-color light covers the first band, which is 480nm-500nm.

5. The light source device according to claim 1, characterized in that, The second color light includes yellow-green light and deep red light, and the second sub-color light, the yellow-green light and the deep red light form a continuous full spectrum.

6. The light source device according to claim 5, characterized in that, The fluorescent structure includes a first phosphor and a second phosphor. The first phosphor is a green phosphor, which is excited by a first sub-color light to output the yellow-green light. The second phosphor is a red phosphor, which is excited by the first sub-color light to output the deep red light.

7. The light source device according to claim 6, characterized in that, The peak wavelength of the yellow-green light is 520nm-530nm; the peak wavelength of the deep red light is 655nm-665nm.

8. The light source device according to claim 7, characterized in that, The half-width λHWW1 of the yellow-green light satisfies the following condition: λ HWW1 ≥120nm; the half-width λ of the deep red light HWW2 The following condition must be met: λ HWW2 ≥80nm.

9. The light source device according to any one of claims 1 to 8, characterized in that, The mixed color light is golden yellow.

10. A lamp, characterized in that, The luminaire includes the light source device as described in any one of claims 1 to 9.

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