Composite luminescent material, luminous body and lamp

Abstract

The invention relates to the technical field of illumination, in particular to a composite luminescent material, a luminous body and a lamp. The composite luminescent material comprises a white light material and a near-infrared fluorescent material, wherein the color temperature of white light emitted by the white light material is 2400-3000 K; after the normalization processing, the emission spectrogram of the white light material and the excitation spectrogram of the near-infrared fluorescent material at least partially coincide with each other under the curve area, and the ratio of the coincide area to the excitation spectrogram under the curve area is greater than or equal to 70%. The white light material can excite the near-infrared fluorescent material to emit near-infrared light, so that the composite luminescent material can emit white visible light and near-infrared light, and illumination and human health promotion are both considered. The area of the overlapping area is large, the excitation effect of white light on the near-infrared fluorescent material is improved, and the energy conversion efficiency is improved. The color temperature of the white light is beneficial to reducing color temperature shift, so that visible light finally emitted by the composite luminescent material is warm white light, and the composite luminescent material is suitable for bedroom illumination and other scenes.

Description

Technical Field

[0001] This application relates to the field of lighting technology, and in particular to composite luminescent materials, luminescent bodies, and luminaires. Background Technology

[0002] Traditional household lighting technology primarily provides visible light. Compared to visible light, near-infrared light has a deeper penetration depth and can promote human health through photobiological regulation, especially the broad peak incidence in the 800 nm–1100 nm near-infrared I region. Therefore, near-infrared light is increasingly being incorporated into existing household lighting technologies, forming a dual-band lighting system alongside visible light.

[0003] Mainstream commercial near-infrared light sources are achieved through two methods: electroluminescence and photoluminescence. Electroluminescent devices are primarily semiconductor chips, such as AlGaAs, GaAs, and InP. However, these devices have a very narrow emission wavelength range, making it difficult to achieve broad-peak incidence. Furthermore, mechanically superimposing a single near-infrared light source with visible light is not only technically complex but also makes the devices difficult to be compatible, thus unsuitable for everyday lighting. Photoluminescence is mainly achieved through semiconductor light-emitting chips combined with phosphors, such as commercial blue or ultraviolet light chips combined with Cr... 3+ Infrared phosphors, acting as activation centers, are used to excite Cr using a single, specific excitation wavelength. 3+ Near-infrared fluorescence. This excitation method is similar to commercial white light, requiring the addition of other visible light phosphors to form a visible light band. However, the following problems exist: On the one hand, when mixed and encapsulated with other visible light phosphors, the effective excitation of the infrared phosphor is limited due to the competition between the powders for the excitation wavelength and the tendency of the powders to block and bury, which in particular easily leads to a decrease in energy conversion efficiency and energy loss; on the other hand, since a portion of the visible light in this device is used to excite the infrared phosphor, the color temperature of the visible light band is easily deviated significantly from the original visible light band, making it difficult to achieve the designed color temperature, thus affecting the lighting quality, such as affecting the accuracy of color rendering and the appropriate color temperature presentation in different scenarios.

[0004] Therefore, there is an urgent need for a luminescent material, luminescent mode, or luminescent device that can emit dual-band light with broad peaks in both visible and near-infrared light, and has high energy conversion efficiency, small color temperature shift, good lighting quality, and can also promote human health. Summary of the Invention

[0005] The purpose of this application is to provide composite luminescent materials, luminescent bodies, and luminaires, aiming to solve the problem that existing photoluminescence technologies cannot provide high-quality visible and near-infrared dual-band light.

[0006] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides a composite luminescent material, including a white light material and a near-infrared fluorescent material dispersed in the white light material, wherein the white light material emits white light with a color temperature of 2400 K to 3000 K; After normalization, the region under the emission spectrum of the white light material at least partially overlaps with the region under the excitation spectrum of the near-infrared fluorescent material, and the ratio of the area of ​​the overlapping region to the area of ​​the region under the excitation spectrum is ≥70%.

[0007] The composite luminescent material in this application includes specific white light materials and near-infrared fluorescent materials. After normalization, the lower region of the emission spectrum of the white light material at least partially overlaps with the lower region of the excitation spectrum of the near-infrared fluorescent material. This indicates that the wavelength range of the white light material's emission coincides with the wavelength range of the excitation light required by the near-infrared fluorescent material. Therefore, the white light material can excite the near-infrared fluorescent material to emit near-infrared light, resulting in a dual-band emission of the composite luminescent material, including the white visible light emitted by the white light material and the near-infrared light emitted by the near-infrared fluorescent material, thus balancing illumination and health promotion. Furthermore, the ratio of the area of ​​the overlapping region to the area of ​​the lower region of the excitation spectrum of the near-infrared fluorescent material is ≥70%, indicating a large overlapping region. This is beneficial for enhancing the excitation effect of white light on the near-infrared fluorescent material, resulting in stronger near-infrared light while also improving energy conversion efficiency, reducing energy loss, and increasing near-infrared light intensity. Finally, the white light emitted by the white light material has a color temperature of 2400 K to 3000 K. When exciting near-infrared fluorescent materials, it can reduce the color temperature shift, so that the visible light emitted by the composite light-emitting material is warm white light, which is suitable for scenarios such as bedroom lighting and has good lighting quality and a high color rendering index.

[0008] Optionally, the absolute value of the difference between the peak wavelength of the emission spectrum of the white light material and the peak wavelength of the excitation spectrum of the near-infrared fluorescent material is 0 nm to 40 nm.

[0009] Optionally, near-infrared fluorescent materials include the following three materials represented by the general formula: Li3P 1-a Mn a O4, a = 0.01~0.1; La3Ga 5.5-b Cr b Nb 0.5 O 14 b = 0.01~0.2; MNSi c O dM includes at least one of Ba, Ca, and Sr, N includes at least one of Cu and Zn, c = 2 to 4, and d = 7 to 10.

[0010] Optionally, after white light excitation, the emission spectrum of the near-infrared fluorescent material has a wavelength range of 800 nm to 1100 nm.

[0011] Optionally, after white light excitation, the emission spectrum of the near-infrared fluorescent material has a full width at half maximum (FWHM) of 110 nm to 135 nm.

[0012] Optionally, after white light excitation, the peak wavelength of the emission spectrum of the near-infrared fluorescent material is 900 nm to 920 nm.

[0013] Optional, near-infrared fluorescent materials include Li3P 1-a Mn a O4, La3Ga 5.5-b Cr b Nb 0.5 O 14 and CaCuSi4O 10 .

[0014] Optionally, white light materials include blue light materials, yellow light fluorescent materials, and red light fluorescent materials.

[0015] Optionally, the composite luminescent material comprises the following components in parts by weight: 10 to 20 parts of yellow fluorescent material 1 to 5 parts of red fluorescent material 1 to 5 parts of near-infrared fluorescent material.

[0016] Optionally, the composite luminescent material comprises the following components in parts by weight: 10 to 20 parts of yellow fluorescent material 1 to 5 parts of red fluorescent material 1 to 5 parts of near-infrared fluorescent material Dispersant 0.02 parts to 0.06 parts 70 to 87 parts of adhesive.

[0017] Secondly, this application provides a light emitter, including the composite light-emitting material described above.

[0018] The luminescent material in this embodiment includes the aforementioned composite luminescent material, thus exhibiting high energy conversion efficiency, low energy loss, and suitable near-infrared light intensity. Furthermore, the color temperature of the luminescent material deviates slightly from the original design color temperature, resulting in warm white visible light that is suitable for scenarios such as bedroom lighting, providing good lighting quality and a high color rendering index. Simultaneously with illumination, the luminescent material also emits near-infrared light, which is beneficial for promoting human health through photobiological regulation.

[0019] Thirdly, this application provides a lamp that includes the composite light-emitting material described above, or includes the light-emitting body described above.

[0020] The lamps in this application embodiment include the aforementioned composite luminescent material or the aforementioned luminescent body, thus exhibiting high energy conversion efficiency, low energy loss, and suitable near-infrared light intensity. Furthermore, the color temperature of the lamps deviates slightly from the original design color temperature, resulting in warm white light emitted, suitable for scenarios such as bedroom lighting, and providing good lighting quality and a high color rendering index. While providing illumination, the lamps can also emit near-infrared light, which is beneficial for promoting human health through photobiological regulation.

[0021] Optionally, the luminaires include blue light sources, yellow fluorescent materials, red fluorescent materials, and near-infrared fluorescent materials. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is the XRD pattern of the near-infrared fluorescent material in Example 1 of this application; Figure 2 This is a schematic diagram of the energy transfer direction in the LED bead of Embodiment 1 of this application; Figure 3 This is a schematic diagram showing the spectrum of white light emitted in step S2 of Embodiments 1, 5, and 6 of this application and the normalized excitation spectrum of the near-infrared fluorescent material prepared in step S1. Figure 4 This is a schematic diagram showing the spectrum of white light emitted in step S2 of Examples 1, 3, and 4 of this application and the normalized excitation spectrum of the near-infrared fluorescent material prepared in step S1. Figure 5This is a schematic diagram of the spectrum of white light emitted in step S2 of Embodiment 1, Comparative Example 1, and Comparative Example 2 of this application, and the normalized excitation spectrum of the near-infrared fluorescent material prepared in step S1. Figure 6 This is a schematic diagram of the final emission spectrum of the LED beads in Embodiments 1 to 4 of this application after normalization. Figure 7 This is a diagram of the lamp bead morphology in Embodiment 1 of this application; Figure 8 This is a COB light strip diagram of a light-emitting body according to this application. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0027] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0028] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass in the embodiments of this application can be a well-known unit of mass in the chemical industry, such as µg, mg, g, or kg.

[0029] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, a first feature may also be referred to as a second feature, and similarly, a second feature may also be referred to as a first feature. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0030] The emission and excitation spectra in this application are presented with wavelength (λ, in nm) on the horizontal axis and relative intensity (au, dimensionless unit) of light irradiance on the vertical axis.

[0031] Spectral normalization refers to the data processing of the irradiance of the spectral curve to obtain the relative intensity, so that different spectral curves can be compared in the same spectral graph.

[0032] Fluorescent materials re-emit light after absorbing light of a specific wavelength, thus exhibiting both excitation and emission spectra. The excitation spectrum refers to the change in fluorescence intensity of a fluorescent material under excitation by light sources of different wavelengths; generally, once the fluorescent material is determined, the excitation spectrum is also determined. The emission spectrum, on the other hand, refers to the distribution of fluorescence intensity at different wavelengths under excitation by a light source of a fixed wavelength.

[0033] The first aspect of this application provides a composite luminescent material, including a white light material and a near-infrared fluorescent material dispersed in the white light material. The white light material emits white light with a color temperature of 2400 K to 3000 K. After normalization, the region under the emission spectrum of the white light material at least partially overlaps with the region under the excitation spectrum of the near-infrared fluorescent material, and the ratio of the area of ​​the overlapping region to the area of ​​the region under the excitation spectrum is ≥70%.

[0034] The composite luminescent material in this application includes specific white light materials and near-infrared fluorescent materials. After normalization, the lower region of the emission spectrum of the white light material at least partially overlaps with the lower region of the excitation spectrum of the near-infrared fluorescent material. This indicates that the wavelength range of the white light material's emission coincides with the wavelength range of the excitation light required by the near-infrared fluorescent material. Therefore, the white light material can excite the near-infrared fluorescent material to emit near-infrared light, resulting in a dual-band emission of the composite luminescent material, including the white visible light emitted by the white light material and the near-infrared light emitted by the near-infrared fluorescent material, thus balancing illumination and health promotion. Furthermore, the ratio of the area of ​​the overlapping region to the area of ​​the lower region of the excitation spectrum of the near-infrared fluorescent material is ≥70%, indicating a large overlapping region. This is beneficial for enhancing the excitation effect of white light on the near-infrared fluorescent material, resulting in stronger near-infrared light while also improving energy conversion efficiency, reducing energy loss, and increasing near-infrared light intensity. Finally, the white light emitted by the white light material has a color temperature of 2400 K to 3000 K. When exciting near-infrared fluorescent materials, it can reduce the color temperature shift, so that the visible light emitted by the composite light-emitting material is warm white light, which is suitable for scenarios such as bedroom lighting and has good lighting quality and a high color rendering index.

[0035] About near-infrared fluorescent materials In some embodiments, after white light excitation, the emission spectrum of the near-infrared fluorescent material has a wavelength range of 800 nm to 1100 nm, including but not limited to any two values ​​between 800 nm, 900 nm, 1000 nm, and 1100 nm. This wavelength range belongs to the near-infrared I region. Compared to visible light, near-infrared light in this wavelength range has a deeper penetration depth into human skin, and therefore can be used in photobiological therapy (PBM) healthcare systems. Low-power light therapy can alleviate pain, promote tissue repair and anti-inflammation, increase cerebral blood flow, improve anxiety and depression, and treat Parkinson's disease and Alzheimer's disease. Therefore, near-infrared fluorescent materials with emission spectra within the aforementioned wavelength range are advantageous because composite luminescent materials can also emit corresponding near-infrared light, thus better promoting human health.

[0036] In some embodiments, after white light excitation, the peak wavelength of the emission spectrum of the near-infrared fluorescent material is 900 nm to 920 nm, which may include, but is not limited to, any value or a range between any two of 900 nm, 905 nm, 910 nm, 915 nm, and 920 nm. Light in this wavelength range, especially light with a wavelength of 910 nm, is advantageous in avoiding the strong absorption region of water and can reach subcutaneous tissue and muscle layers, making it an ideal phototherapy window. Furthermore, the irradiance is higher in the peak wavelength region of the spectrum; therefore, near-infrared fluorescent materials with peak wavelengths in this range can concentrate the main irradiance within this wavelength range, better exerting the effects of near-infrared light and promoting human health.

[0037] In some embodiments, after white light excitation, the half-width at half-maximum (WHM) of the emission spectrum of the near-infrared fluorescent material is 110 nm to 135 nm, and may include, but is not limited to, any value or any two of 110 nm, 115 nm, 120 nm, 125 nm, 130 nm, and 135 nm. This relatively large WHM range results in a flatter peak in the emission spectrum of the near-infrared fluorescent material, a broader overall curve shape, and a wider range of emitted near-infrared light wavelengths, which is more conducive to maximizing the health-promoting effects of near-infrared light. Specifically, the health benefits of near-infrared light mainly stem from the absorption of photons by cytochrome c oxidase (CCO) in mitochondria, which enhances mitochondrial membrane potential and promotes ATP synthesis, while simultaneously regulating reactive oxygen species (ROS) levels to achieve redox balance. Since the absorption spectrum of CCO is characterized by a broad spectrum rather than being limited to a specific wavelength, broad peak incidence on human skin helps cover multiple absorption pathways of CCO, further promoting human health. Simultaneously, broad peak incidence on human skin also facilitates a more uniform energy distribution, reducing the local hotspot effect caused by concentrated energy in narrow-band light and minimizing discomfort.

[0038] In some embodiments, near-infrared fluorescent materials include materials represented by the following three general formulas: Li3P 1-a Mn a O4, a = 0.01~0.1; La3Ga 5.5-b Cr b Nb 0.5 O 14 b = 0.01~0.2; MNSi c O d M includes at least one of Ba, Ca, and Sr, N includes at least one of Cu and Zn, c = 2 to 4, and d = 7 to 10.

[0039] Among them, Li3P1-a Mn a Mn in O4 5+ A small amount of Mn is doped at the phosphorus sites of lithium phosphate. 5+ As the luminescent core, after excitation, electrons undergo energy level transitions and emit photons in the near-infrared band, giving the material corresponding near-infrared fluorescence properties. α can be any value or a range between two of 0.01, 0.03, 0.05, 0.07, and 0.1. La3Ga 5.5-b Cr b Nb 0.5 O 14 Cr 3+ A small amount of Cr is doped at the gallium sites of lanthanum gallium niobate. 3+ As the luminescent core, after excitation, electrons undergo energy level transitions and emit photons, a portion of which are located in the near-infrared band with a relatively wide range, giving the material corresponding near-infrared fluorescence. b can be any value or a range between two of 0.01, 0.05, 0.1, 0.15, and 0.2. MNSi c O d Cu in 2+ or Zn 2+ As the luminescent core, it possesses corresponding near-infrared fluorescence properties, and may include, but is not limited to, BaCuSi4O. 10 BaCuSi2O6, CaCuSi4O 10 At least one of the following materials. In summary, the hybrid system formed by these three materials exhibits excellent near-infrared fluorescence, and can be excited by specific wavelengths of visible light to emit near-infrared light, thus including the near-infrared light band in the composite luminescent material, which is beneficial to promoting human health. In the example, the near-infrared fluorescent material is Li3P. 1-a Mn a O4, La3Ga 5.5-b Cr b Nb 0.5 O 14 and CaCuSi4O 10 The near-infrared phosphor obtained by mixing has an excitation spectrum in the visible light range, while the wavelength range of near-infrared light emitted after activation is mainly in the range of 800 nm to 1100 nm. It can emit a broad-peak near-infrared light with a peak wavelength of 910 nm, which is very much in line with the above-mentioned PBM healthcare needs and is beneficial to promoting human health.

[0040] Regarding white light materials White light materials and near-infrared fluorescent materials act as sensitizers, respectively. S ) and activator ( AFluorescent materials require light within a specific wavelength range for excitation, while white light is a composite light composed of various colored lights. The emission spectrum of white light materials exhibits corresponding intensities at different wavelengths. If, in terms of the excitation wavelength range of near-infrared fluorescent materials, the intensity of white light in that range is too low, the excitation effect on near-infrared fluorescent materials will be poor, and the energy conversion efficiency will be too low. From an energy transfer perspective, the sensitizer ( S ) and activator ( A The resonant energy transfer efficiency between them can be expressed as:

[0041] in, S As a sensitizer, A As an activator. In the integral term, and right dE The integral shows that, corresponding to a certain energy value E ,when S When center A emits energy and center B absorbs energy, and both of these conditions are met, a certain energy transfer efficiency is achieved, which means that... S The emission spectrum of the center and A The absorption spectra at the center overlap. Furthermore, the larger the area of ​​the overlapping region, the higher the transfer efficiency, which reduces energy loss and increases near-infrared light intensity. In this application, the ratio of the area of ​​the overlapping region to the area under the curve of the near-infrared fluorescent material's excitation spectrum can be, but is not limited to, any value or a range between any two of 70%, 80%, 90%, and 99%.

[0042] Because white light spectra have different waveforms, some white light has higher intensity in the blue wavelength region, while others have higher intensity in the red wavelength region, resulting in different color temperatures. Even at the same color temperature, different spectral curves and peak shapes can lead to completely different excitation results for near-infrared fluorescent materials. In some embodiments, the absolute value of the difference between the peak wavelength of the emission spectrum of the white light material and the peak wavelength of the excitation spectrum of the near-infrared fluorescent material is 0 nm to 40 nm, and may include, but is not limited to, any value or any two values ​​of 0 nm, 10 nm, 20 nm, 30 nm, and 40 nm. When the absolute value of this difference is within this range, the wavelength required to excite the near-infrared fluorescent material corresponds precisely to the high-intensity region of the white light emitted by the white light material. This facilitates a large overlap of the areas under the two curves, enabling better excitation of the near-infrared fluorescent material by the white light material. This allows the near-infrared fluorescent material to emit near-infrared light more efficiently, improving the overall luminescence performance and energy conversion efficiency of the emitter, reducing energy loss, and increasing the intensity of near-infrared light. In the example, the difference can be selected as 0 nm, which means that the peak wavelengths of the two are the same. The high-intensity region in the white light emitted by the white light material perfectly matches the excitation requirements of the near-infrared fluorescent material, and can better excite the near-infrared fluorescent material.

[0043] White light materials provide visible light to near-infrared fluorescent materials to excite them, and the emitted white visible light can also be used for illumination. White light materials can include materials that emit the three primary colors of light individually, or combinations of materials that emit polychromatic light. By combining these materials, the irradiance of each wavelength can be adjusted, resulting in white light with different color temperatures to meet various lighting needs.

[0044] In some embodiments, white light materials include blue light materials, yellow light fluorescent materials, and red light fluorescent materials. On the one hand, yellow light includes red and green light, so the light emitted by these three types of materials includes the three primary colors, which can form white light. This is beneficial for increasing the irradiance of red light in the spectrum, which helps the white light emitted by the white light materials to lower the color temperature, resulting in a warmer white light suitable for scenarios such as bedroom lighting. On the other hand, blue light materials can be materials that can emit blue light on their own, such as blue LED chips. Yellow and red light fluorescent materials are fluorescent materials that can be excited to emit yellow and red light under blue light irradiation. The corresponding devices and materials are easy to obtain, design, and combine in practice, which is beneficial for improving the preparation efficiency and practicality of the composite light-emitting material. The light emission process is that the blue light material first emits blue light, which then excites the yellow and red light fluorescent materials to obtain visible light. A portion of the visible light then excites near-infrared light. Through secondary energy transfer, the conversion of blue light material into dual-band light of visible and near-infrared light is achieved, which is an indirect excitation process. Therefore, this case can solve problems such as narrowband light emission and device coupling in electro-excited semiconductor near-infrared chips, and also solves the problem of ineffective filling of near-infrared fluorescence directly excited by blue light by visible light phosphors. The light source of this invention has the characteristics of effective excitation, low cost, wide wavelength, and low power, integrating near-infrared light for phototherapy into daily visible light lighting, providing a healthy light source that combines daily lighting with PBM phototherapy.

[0045] In the example, the blue light material uses a blue LED chip, which has high luminous efficiency, good stability, and relatively low cost; the yellow light phosphor uses yttrium aluminum garnet (YAG) based phosphor, which emits bright yellow light when excited by blue light; and the red light phosphor uses nitride-based phosphor, which emits vivid red light when excited by blue light. By combining these three types of materials and adjusting their respective proportions, the color temperature of the white light material can be flexibly adjusted to meet the lighting needs of different scenarios.

[0046] In addition, white light materials can be combined in other ways, such as combining blue light materials with orange fluorescent materials, or combining green light materials, blue light materials, and red fluorescent materials. These combinations can also form white light, and the spectral distribution can be optimized by adjusting the proportions of each material, thereby improving the lighting quality. In the example, when blue light materials are combined with orange fluorescent materials, the orange fluorescent material emits orange light when excited by blue light. This orange light contains components of red and green light, and when mixed with blue light, it can also form white light. Moreover, this combination helps to increase the proportion of red light in the spectrum, making the white light warmer and softer.

[0047] When white light excites near-infrared fluorescent materials, the region in the white light spectrum that overlaps with the excitation spectrum wavelength of the near-infrared fluorescent material is absorbed by the material. The closer to the peak of the excitation spectrum, the more energy is absorbed. This means that a portion of the white light energy is used internally by the composite luminescent material to excite the near-infrared fluorescent material. Consequently, when the material emits light, the irradiance of that wavelength region in the white light spectrum decreases, resulting in a color temperature shift and affecting lighting quality. By controlling the color temperature of the white light emitted by the white light material between 2400 K and 3000 K, and by ensuring that the ratio of the overlapping area between the lower region of the emission spectrum of the white light material and the lower region of the excitation spectrum of the near-infrared fluorescent material is ≥70%, a balance can be struck between high energy conversion efficiency and low color temperature shift, keeping the color temperature shift within 1000 K. Ultimately, the composite luminescent material exhibits an overall color temperature <4000 K, presenting a warm white light suitable for indoor scenes such as bedrooms. Furthermore, it has a high color rendering index, accurately reflecting the color of objects.

[0048] In some embodiments, the composite luminescent material comprises the following components in parts by weight: 10 to 20 parts of yellow fluorescent material 1 to 5 parts of red fluorescent material 1 to 5 parts of near-infrared fluorescent material.

[0049] This composite luminescent material can be excited by the aforementioned blue light material. The yellow fluorescent material can be any value or range between any two of 10, 13, 15, 17, or 20 parts; the red fluorescent material can be any value or range between any two of 1, 2, 3, 4, or 5 parts; and the near-infrared fluorescent material can be any value or range between any two of 1, 2, 3, 4, or 5 parts. These different combinations of mass fractions are beneficial for further enriching the spectral characteristics of the white light material, meeting more diverse lighting needs, such as representing different color temperatures and color rendering indices. The amount of near-infrared fluorescent material also affects the degree of color temperature shift and the intensity of emitted near-infrared light. If the amount is too small, the color temperature shift is slight, making it difficult to emit sufficient near-infrared light, resulting in poor health benefits. Conversely, if the amount is too large, although the near-infrared light intensity increases, the near-infrared fluorescent material will absorb a large amount of energy within a specific range of white light, causing a severe color temperature shift in the visible light band, affecting color temperature design, color rendering accuracy, and lighting quality. Furthermore, different component dosages can affect the intensity ratio of the visible light region to the near-infrared light region in the final dual-band light emitted by the composite luminescent material. In the example, the area under the near-infrared band curve accounts for 18% to 23% of the final emission spectrum of the composite luminescent material, exhibiting the best health-promoting effect and facilitating relaxing phototherapy in the bedroom environment.

[0050] Furthermore, in some embodiments, the composite luminescent material comprises the following components in parts by weight: 10 to 20 parts of yellow fluorescent material 1 to 5 parts of red fluorescent material 1 to 5 parts of near-infrared fluorescent material Dispersant 0.02 parts to 0.06 parts 70 to 87 parts of adhesive.

[0051] The diffusing agent can be any value or a range between any two of 0.02 parts, 0.03 parts, 0.04 parts, 0.05 parts, and 0.06 parts; the binder can be any value or a range between any two of 70 parts, 75 parts, 80 parts, 85 parts, and 87 parts. The addition of the diffusing agent effectively improves the light scattering performance of the composite luminescent material, resulting in more uniform and softer light emission and reduced glare. The binder ensures a tight bond between the various fluorescent materials, improving the stability and reliability of the composite luminescent material.

[0052] The binder may include, but is not limited to, at least one of epoxy resin, silicone resin, and water-soluble binder (such as polyethylene oxide, PEO), and the dispersant may include, but is not limited to, common commercial dispersants. In an example, the above components can be uniformly mixed using a vacuum stirring degassing machine to ensure that the whole system is bubble-free and uniformly dispersed. Finally, the composite luminescent material is encapsulated onto a blue LED chip using a dispensing machine.

[0053] A second aspect of this application provides a light emitter, including the composite light-emitting material described in the above application embodiments.

[0054] The luminescent material in this embodiment includes the aforementioned composite luminescent material, thus exhibiting high energy conversion efficiency, low energy loss, and suitable near-infrared light intensity. Furthermore, the color temperature of the luminescent material deviates slightly from the original design color temperature, resulting in warm white visible light that is suitable for scenarios such as bedroom lighting, providing good lighting quality and a high color rendering index. Simultaneously with illumination, the luminescent material also emits near-infrared light, which is beneficial for promoting human health through photobiological regulation.

[0055] The light emitter in this application may include, but is not limited to, devices emitting white light and near-infrared fluorescent materials, red fluorescent materials, yellow fluorescent materials, near-infrared fluorescent materials and blue LED chips, other light-emitting chips, phosphors that can form white light with light-emitting chips, and near-infrared fluorescent materials, etc. Specific light emitter forms may include SMD LED chips, COB LED strips (such as...) Figure 8 (as shown in the image) etc.

[0056] A third aspect of this application provides a lamp that includes a composite light-emitting material as described in the above application embodiment, or a light-emitting body as described in the above application embodiment.

[0057] The lamps in this application embodiment include the aforementioned composite luminescent material or the aforementioned luminescent body, thus exhibiting high energy conversion efficiency, low energy loss, and suitable near-infrared light intensity. Furthermore, the color temperature of the lamps deviates slightly from the original design color temperature, resulting in warm white light emitted, suitable for scenarios such as bedroom lighting, and providing good lighting quality and a high color rendering index. While providing illumination, the lamps can also emit near-infrared light, which is beneficial for promoting human health through photobiological regulation.

[0058] This lighting fixture can be used in multiple scenarios. When it exists in the form of COB light strip, it can be embedded in the ceiling as a linear light. When it exists in the form of SMD LED beads, it can be flexibly packaged into various forms of lighting fixtures according to the application scenario, including bedside lamps, ceiling lights, pendant lights, table lamps, night lights, etc.

[0059] In some embodiments, the luminaire includes a blue light source, a yellow fluorescent material, a red fluorescent material, and a near-infrared fluorescent material. Through secondary energy transfer, the conversion from blue light to dual-band visible and near-infrared light is achieved, integrating near-infrared light for phototherapy into everyday visible light lighting, providing a healthy light source that combines daily lighting with PBM phototherapy.

[0060] The following description is based on specific embodiments.

[0061] Example 1 This embodiment provides a composite luminescent material and a lamp bead, the preparation method of which includes the following steps S1 to S3: Step S1: Provide near-infrared fluorescent materials The following three components were synthesized via a high-temperature solid-state synthesis method: Li3P 0.95 Mn 0.05 O4, La3Ga 5.45 Cr 0.05 Nb 0.5 O 14 and CaCuSi4O 10 The three components are mixed to form a fluorescent powder, resulting in a near-infrared fluorescent material. Samples are then subjected to XRD analysis, such as... Figure 1 As shown, the near-infrared fluorescent material exhibits high crystallinity, particularly due to the low doping levels of Mn and Cr. Figure 1 The standard card used is lithium phosphate and lanthanum gallium niobate. The excitation spectrum of this near-infrared fluorescent material is shown below. Figure 3 , Figure 4 , Figure 5As shown by the red curve in the figure, once the material type is determined, the excitation spectrum is also determined. The figure shows that the excitation wavelength λ of this fluorescent material is... ex In the visible light band, and λ ex The peak is at approximately 625 nm, indicating that irradiating the near-infrared fluorescent material with light within this wavelength range will cause it to emit near-infrared light. Visible light at approximately 625 nm has the strongest excitation effect on this near-infrared fluorescent material, exciting it to emit near-infrared light with a peak at approximately 910 nm. It is necessary to distinguish between λ and λ here. ex and λ em , Figure 3 , Figure 4 , Figure 5 The excitation spectrum text in the figure corresponds to the excitation spectrum curve of the near-infrared fluorescent material, while the λ in parentheses... em = 910 nm refers to the wavelength λ corresponding to the peak of the near-infrared light emitted by this near-infrared fluorescent material after it is excited. em The peak value is 910 nm, which is the standard notation. The emitted near-infrared light is in... Figure 3 , Figure 4 , Figure 5 Not shown in Figure 6 The near-infrared spectrum of the emission can be seen in the image.

[0062] Step S2: Prepare fluorescent materials with a color temperature of 2700 K in the visible light band. Using a blue LED chip as the light source, which emits blue light with a peak wavelength of 452 nm, the following components in parts by weight are then mixed: Yellow phosphor: 20 parts Red phosphor: 2 parts; Among them, the yellow phosphor is YAG phosphor (SDY548-30, Yantai Bright Optoelectronic Materials Co., Ltd.), and the red phosphor is nitride red phosphor (SSDR640A, Yantai Bright Optoelectronic Materials Co., Ltd.).

[0063] Blue light emitted by a blue LED chip excites yellow and red phosphors. The blue, yellow, and red light are mixed to produce white light, with a measured color temperature of 2700 K, which is warm white light.

[0064] Step S3: Prepare LED beads Add the near-infrared phosphor and other components from step S1 to the above-mentioned yellow phosphor and red phosphor, and mix them evenly using a vacuum stirrer to ensure that the whole mixture is bubble-free and in a uniformly dispersed system, to obtain the following composition by weight, which is the composite luminescent material: Yellow phosphor: 20 parts Red phosphor: 2 parts Near-infrared phosphor: 2.2 parts Diffusion powder: 0.06 parts Glue A: 80 parts B-type glue: 27 parts; Among them, the diffusion powder is S1001 (Yantai Bright Optoelectronic Materials Co., Ltd.), the A glue is silicone (KX-8144A, Huizhou Kaixiang New Materials Co., Ltd.), and the B glue is silicone (KX-8144B, Huizhou Kaixiang New Materials Co., Ltd.).

[0065] like Figure 7 As shown, the composite luminescent material is encapsulated onto a blue LED chip using a dispensing machine, and after curing, an LED bead is obtained, which is designated as #1.

[0066] Example 2 This embodiment provides a composite luminescent material and a lamp bead. The preparation method differs from that of Embodiment 1 only in that the mass fraction of near-infrared phosphor in step S3 is changed to 4 parts, while the other steps are the same. The lamp bead obtained in the end is designated as #2.

[0067] Example 3 This embodiment provides a composite luminescent material and a light bead. The preparation method differs from that of Embodiment 1 only in that the mass fraction of the near-infrared phosphor in step S3 is changed to 6.7 parts. All other steps are the same, and the final light bead is designated as #3.

[0068] Example 4 This embodiment provides a composite luminescent material and a light bead. The preparation method differs from that of Embodiment 1 only in that the mass fraction of the near-infrared phosphor in step S3 is changed to 11 parts. All other steps are the same, and the final light bead is designated as #4.

[0069] Example 5 This embodiment provides a composite luminescent material and a light bead. The only difference between the preparation method and that of Embodiment 1 is that the amounts of yellow phosphor and red phosphor in step S2 are adjusted. Yellow phosphor: 22 parts Red phosphor: 2.3 parts; Compared to Example 1, the amount of these two phosphors was increased, resulting in white light obtained by color mixing under the excitation of a blue LED chip. The measured color temperature was 2400 K, which is relatively low, indicating a warm white light, warmer than that of Example 1. All other steps were the same.

[0070] Example 6 This embodiment provides a composite luminescent material and a light bead. The only difference between the preparation method and that of Embodiment 1 is that the amounts of yellow phosphor and red phosphor in step S2 are adjusted. Yellow phosphor: 19 parts Red phosphor: 1.8 parts; Compared to Example 1, the amount of these two phosphors was reduced, resulting in white light obtained by color mixing under the excitation of a blue LED chip. The measured color temperature was 3000 K, which is relatively high, indicating a warm white light, but cooler than that of Example 1. All other steps were the same.

[0071] Comparative Example 1 This comparative example provides a composite luminescent material and LED bead. The difference between the preparation method and Example 1 lies in the adjustment of the type and ratio of phosphors in step S2. SDG525M green phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), SSDR625F red phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), SDSG526 3000 K high-efficiency phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), SDK401 high-efficiency phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), and S1001 diffuser powder (Yantai Bright Optoelectronic Materials Co., Ltd.) are used. The measured color temperature is also 2700 K, but the shape of the spectral curve is completely different from that of Example 1. Figure 5 As shown.

[0072] Comparative Example 2 This comparative example provides a composite luminescent material and LED bead. The difference between the preparation method and Example 1 lies in the adjustment of the type and ratio of phosphor in step S2. YAG phosphor (SDY548-30, Yantai Bright Optoelectronic Materials Co., Ltd.), SDG525M green phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), SSDR628Z01 red phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), KSF SDK401 red phosphor (Yantai Bright Optoelectronic Materials Co., Ltd.), and S1001 diffuser powder (Yantai Bright Optoelectronic Materials Co., Ltd.) are used. The measured color temperature is also 2700 K, but the shape of the spectral curve is completely different from that of Example 1. Figure 5 As shown.

[0073] Comparative Example 3 This comparative example provides a composite luminescent material and a light bead. The difference between the preparation method and that of Example 1 is only that the amounts of yellow phosphor and red phosphor in step S2 are adjusted. Yellow phosphor: 27 parts Red phosphor: 3.5 parts; The amount of both phosphors used was increased compared to Examples 1 and 5. This resulted in white light being obtained by color mixing under the excitation of a blue LED chip. The measured color temperature was 2000 K, which is relatively low and indicates a warm white light, warmer than that of Examples 1 and 5. All other steps were the same.

[0074] Comparative Example 4 This comparative example provides a composite luminescent material and a light bead. The difference between the preparation method and that of Example 1 is only that the amounts of yellow phosphor and red phosphor in step S2 are adjusted. Yellow phosphor: 17 parts Red phosphor: 1.1 parts; The amount of both phosphors used was reduced compared to Examples 1 and 6. This resulted in white light being obtained by color mixing under the excitation of a blue LED chip, with a measured color temperature of 3500 K. The color temperature was relatively high, indicating a warm white light, which was slightly cooler than that of Examples 1 and 6. All other steps were the same.

[0075] The differences between the cases are shown in Table 1 below:

[0076] contrast Figure 3 , Figure 4 , Figure 5 It can be seen that the excitation spectrum of near-infrared fluorescent materials is mainly in the visible light band, where λ ex The peak is at approximately 625 nm, while the overall intensity of the excitation spectrum is relatively low in the blue light band range of 400 nm to 500 nm. In these cases, the white light exhibits a small peak in this blue light band range, representing the remaining intensity after the blue light emitted by the blue LED is absorbed by the red and yellow phosphors. Comparison shows that in existing technologies, the excitation effect of commercially available blue light with a peak of 452 nm on near-infrared fluorescent materials is limited; it requires the combined excitation of near-infrared fluorescent materials by red and yellow phosphors.

[0077] Relevant performance tests and results analysis 1. Tests and comparisons related to different color temperatures 1.1 Energy Conversion Description like Figure 2 The direction of energy transfer in the LED chip is shown. Figure 2 In this context, ET represents the direction of energy transfer. In Examples 1 and others, the blue LED chip is first powered on, exciting the red and yellow phosphors. The emitted red and yellow light wavelengths are 600 nm–720 nm and 480 nm–700 nm, respectively. These light wavelengths then combine with the blue light from the LED to form white light, with a wavelength of 450–720 nm. The white light then transfers energy to the near-infrared phosphor, exciting it. The near-infrared phosphor emits near-infrared light in the 800 nm–1100 nm range. This secondary excitation method achieves visible-near-infrared dual-band light emission. Therefore, after powering on the blue LED chip, the final emission spectra of the lamps in Examples 1–4 are as follows: Figure 6As shown, the LED has dual-band wavelengths of visible and near-infrared light. The visible light band is 400 nm to 750 nm. Due to the fluorescence characteristics of the aforementioned near-infrared fluorescent material, the near-infrared band has a broad peak in the range of 800 nm to 1100 nm, with a fluorescence half-maximum width of 123 nm. This broad peak incident on human skin is beneficial for covering multiple absorption pathways of CCO. The peak wavelength is 910 nm, which helps to avoid the strong absorption region of water and can reach subcutaneous tissue and muscle layer, making it an ideal phototherapy window.

[0078] 1.2 Energy Conversion Calculation In Examples 1, 5, 6, Comparative Examples 3, and 4, only the color temperature of the white light portion differs. The voltage applied to the blue LED chip is 24 V, and the current is also the same; therefore, the input power of the LED beads is the same. The emission spectrum of the white light in step S2 and the excitation spectrum of the near-infrared phosphor prepared in step S1 are both normalized as follows: Figure 3 , Figure 4 As shown, except for the 2000 K white light in Comparative Example 3, the peak positions of the white light in the other cases almost coincide with the peak positions of the excitation spectrum of the near-infrared phosphor. Then, the area under the emission spectrum curve of white light and the area under the excitation spectrum curve of the near-infrared phosphor were calculated, and their respective integral areas were calculated in au·nm. Next, the integral area of ​​the overlapping region in each case was calculated. Finally, the overlapping integral area was divided by the integral area of ​​the excitation spectrum curve of the near-infrared phosphor to obtain the corresponding percentage. The results are recorded in Table 2.

[0079] As can be seen, the color temperature of step S2 in each case in Table 2 is different, and their overlapping integral areas and ratios are also different. Then, the luminescence results of the LED beads finally produced in the above cases are verified: Verification method one includes calculating the final emission spectrum of the LED chip, as shown in the final emission spectrum of the LED chip in Example 1. Figure 6 As shown in the figure. The cases were normalized, and the integration area was calculated using the integration method described above, with units of au·nm. According to the verification results, as the overlapping integration area in Table 2 gradually increases, the proportion of the integration area gradually increases, and the energy conversion efficiency also gradually increases, with lower energy loss. However, color temperature drift issues will occur, which will be discussed further later.

[0080] Verification method two no longer uses relative testing, but instead tests the absolute power of the final light emitted by the LED to obtain the irradiance per unit area, measured in W·m². -2Based on the same input power of the blue LED chip, the irradiance per unit area of ​​each case was compared. The test results were consistent with the above, that is, as the overlapping integral area in Table 2 gradually increases, the integral area ratio gradually increases, the energy conversion efficiency also gradually increases, and the energy loss is low, but color temperature drift will occur.

[0081] The above verification results all demonstrate that during the selection of luminescent materials, the higher the ratio of the overlapping area of ​​the region under the emission spectrum of the white light material to the area under the excitation spectrum of the near-infrared fluorescent material to the area under the excitation spectrum of the white light material, the higher the energy conversion efficiency. This ratio is preferably greater than or equal to 70%.

[0082] 1.3 The phenomenon of color temperature shift of white light at different color temperatures In Comparative Example 3, the white light color temperature in step S2 is 2000 K. The integral area of ​​the overlapping region between its spectrum and the region under the near-infrared phosphor excitation spectrum is only 86 au·nm, which is much smaller than the 123 au·nm of the 2700 K white light in Example 1, indicating a very low energy conversion efficiency. In Comparative Example 4, the white light color temperature in step S2 is 3500 K. The integral area of ​​the overlapping region is increased to 137 au·nm compared to the 123 au·nm of the 2700 K white light. Although the energy transfer efficiency is higher, after adding near-infrared phosphor in the subsequent step S3, a significant color temperature drift problem occurs in the white light band emitted by the final LED.

[0083] In Example 1, the white light drifts from 2700 K to 3200 K of the LED chip, while in Comparative Example 4, the white light drifts from 3500 K to 4200 K of the LED chip. The color temperature is too high, approaching neutral white light. It is evident that while 3500 K white light has higher energy transfer efficiency with the near-infrared phosphor, it also leads to a greater color temperature drift, making the white light source's color temperature too neutral and unsuitable for warm white light in bedroom lighting environments. Therefore, the color temperature of the white light in step S2 can be selected from 2400 K to 3000 K, preferably 2700 K.

[0084] 2. Correlation tests and comparisons of different waveforms at the same color temperature White light sources can be composed of different proportions of the three primary colors of light, and even the same color temperature can present different spectra. For example... Figure 5 As shown, the white light color temperature in step S2 of Example 1, Comparative Example 1, and Comparative Example 2 is all 2700 K. The difference lies in the different spectral curves of the white light, resulting in different overlap areas with the excitation spectrum of the near-infrared fluorescent material, and consequently, different energy conversion efficiencies. Comparing these cases, from... Figure 5It can be clearly seen that the 2700 K white light spectrum in Example 1 has the largest overlap area with the excitation spectrum of the near-infrared phosphor. Based on the external quantum efficiency of the LED device (… η EQE ), internal quantum efficiency ( η IQE ) and absorption efficiency ( η AE The relationship between )

[0085] It can be seen that, with the same internal quantum efficiency, the external quantum efficiency of a device is closely related to its absorption efficiency. Higher absorption efficiency leads to higher external quantum efficiency, and external quantum efficiency is an important indicator for evaluating the performance of LED devices. Furthermore,

[0086] in, P(λ) To excite the spectral power distribution of the light source, which is the emission spectrum of the sensitizer, α(λ) This represents the absorption coefficient of the material at different wavelengths, and its shape is almost identical to the excitation spectrum of the fluorescent material. An increase in the overlap area between the two means that this integral value increases, and the absorption efficiency (…) η AE This will also improve, ultimately resulting in LEDs with higher external quantum efficiency. For details, please refer to verification methods one and two in section 1.2 above to reach the same conclusion.

[0087] Therefore, even with the same white light color temperature, the shape of the white light spectrum will affect the final energy conversion efficiency of the LED and the intensity of near-infrared light. The higher the ratio of the overlapping area of ​​the underside region of the emission spectrum of the white light material to the area of ​​the underside region of the excitation spectrum of the near-infrared fluorescent material, the higher the energy conversion efficiency; preferably, the ratio is greater than or equal to 70%.

[0088] 3. Tests and comparisons related to the dosage of near-infrared phosphor like Figure 6The image shows the final emission spectra of the LED beads in Examples 1 to 4. The only difference between these four cases is the amount of near-infrared phosphor used. From #1 to #4, as the amount of near-infrared phosphor increases, the intensity of near-infrared light in the range of 800 nm to 1100 nm gradually increases, and its proportion in the entire spectrum curve becomes higher and higher. Moreover, the wavelength and peak shape corresponding to the peak of the near-infrared light band remain basically unchanged. The broad peak incident on human skin is beneficial to cover multiple absorption pathways of CCO. The peak wavelength is 910 nm, which is beneficial to avoid the strong absorption band region of water and can reach the subcutaneous tissue and muscle layer, making it an ideal phototherapy window. These are the advantages brought by choosing the above-mentioned manganese-doped lithium phosphate, chromium-doped gallium lanthanum niobate, and copper calcium silicate mixture system as the near-infrared fluorescent material.

[0089] at the same time, Figure 6 In the visible light band of 400 nm to 750 nm, as the concentration of near-infrared phosphor increases, the peak shape changes due to energy transfer to the near-infrared phosphor, causing the color temperature to gradually drift and increase from 3200 K. Example 4 showed the most severe color temperature drift, reaching 5100 K, resulting in cool white light. Based on the requirements of bedroom lighting and the proportion of near-infrared phosphor needed for PBM phototherapy, LED #2 was selected. The final emitted color temperature is between 3500 K and 4000 K, as required in a bedroom environment, exhibiting a warm white hue with a color rendering index (Ra) of 88. Furthermore, the area under the near-infrared band curve accounts for 18% to 23% of the entire spectrum, which is beneficial for achieving relaxing phototherapy in a bedroom environment.

[0090] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A composite luminescent material, characterized in that: It includes a white light material and a near-infrared fluorescent material dispersed in the white light material, wherein the white light material emits white light with a color temperature of 2400 K to 3000 K; After normalization, the region under the emission spectrum of the white light material at least partially overlaps with the region under the excitation spectrum of the near-infrared fluorescent material, and the ratio of the area of ​​the overlapping region to the area of ​​the region under the excitation spectrum is ≥70%.

2. The composite luminescent material according to claim 1, characterized in that: The absolute value of the difference between the peak wavelength of the emission spectrum of the white light material and the peak wavelength of the excitation spectrum of the near-infrared fluorescent material is 0 nm to 40 nm; and / or, The near-infrared fluorescent material includes the following three materials with the general formula: Li3P 1-a Mr. a O4, a = 0.01~0.1; La3Ga 5.5-b Cr b Nb 0.5 O 14 ,b = 0.01~0.2; MNSi c O d M includes at least one of Ba, Ca, and Sr, N includes at least one of Cu and Zn, c = 2 to 4, and d = 7 to 10.

3. The composite luminescent material according to claim 1 or 2, characterized in that: After being excited by white light, the emission spectrum of the near-infrared fluorescent material satisfies at least one of the following characteristics (1) to (3): (1) The wavelength range is 800 nm to 1100 nm; (2) The full width at half maximum (FWHM) is 110 nm to 135 nm; (3) The peak wavelength is 900 nm to 920 nm.

4. The composite luminescent material according to claim 1 or 2, characterized in that: The near-infrared fluorescent material includes Li3P. 1-a Mn a O4, La3Ga 5.5-b Cr b Nb 0.5 O 14 and CaCuSi4O 10 .

5. The composite luminescent material according to claim 1 or 2, characterized in that: The white light materials include blue light materials, yellow light fluorescent materials, and red light fluorescent materials.

6. The composite luminescent material according to claim 5, characterized in that, The components include the following parts by weight: 10 to 20 parts of the yellow fluorescent material 1 to 5 parts of the red fluorescent material The near-infrared fluorescent material is 1 to 5 parts.

7. The composite luminescent material according to claim 6, characterized in that, The components include the following parts by weight: 10 to 20 parts of the yellow fluorescent material 1 to 5 parts of the red fluorescent material 1 to 5 parts of the near-infrared fluorescent material Dispersant 0.02 parts to 0.06 parts 70 to 87 parts of adhesive.

8. A light-emitting body, characterized in that: Includes the composite luminescent material as described in any one of claims 1 to 7.

9. The light emitter according to claim 8, characterized in that: It includes a blue light source, a yellow fluorescent material, a red fluorescent material, and the near-infrared fluorescent material.

10. A lamp, characterized in that: It includes the composite luminescent material as described in any one of claims 1 to 7, or the luminescent body as described in claim 8 or 9.

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