A light source module and a lighting device

Abstract

This application relates to the field of lighting technology, and more particularly to a light source module and lighting device. The light source module includes multiple phosphors, at least a first phosphor, a second phosphor, a third phosphor, and a fourth phosphor. The first phosphor is configured to emit a first color light with a peak wavelength of 485-515 nm upon excitation; the second phosphor is configured to emit a second color light with a peak wavelength of 520-580 nm upon excitation; the third phosphor is configured to emit a third color light with a peak wavelength of 615-655 nm upon excitation; and the fourth phosphor is configured to emit a fourth color light with a peak wavelength of 660-700 nm upon excitation. This invention, through the configuration of multiple phosphors, not only achieves a high color rendering index (CRI) (Ra>95) but also considers a good color preference index (MCPI) and color resolution index (CDM).

Description

Technical Field

[0001] This application relates to the field of lighting technology, and in particular to a light source module and lighting device. Background Technology

[0002] The Color Rendering Index (CRI) is the most commonly used method for describing the quality of white light. Established in 1965 by the International Commission on Illumination (CIE), the CRI is an international standard for evaluating the color rendering of light sources. Its purpose is to define the color difference between a specified color sample under a test illuminant and a reference illuminant. For a long time, the CRI has been the absolute standard in the lighting field. However, with the development of LED lighting technology, the shortcomings of this indicator in evaluating the color quality of lighting have gradually become apparent. To fully describe the color quality of a light source, many different aspects should be included, such as luminous fidelity, color preference, naturalness, discrimination, and vividness.

[0003] Current high color rendering index (Ra>95) LED light sources primarily compensate for significant differences in wavelengths compared to sunlight with similar relative color temperatures. This includes increasing the blue-green spectrum and decreasing the red spectrum. A prime example is the "full-spectrum LED" products currently on the market, which strive to closely approximate standard light sources in the visible light band (400-700nm). Since the spectrum of standard light sources is similar to sunlight, in addition to having a similar energy distribution across wavelengths, their color rendering index (CRI) also approaches that of sunlight (sunlight's CRI is close to 100). However, this method results in white LED light with a bluish tint, which, from a visual perspective, is not the optimal light source for color rendering. Utility Model Content

[0004] The purpose of the embodiments in this specification is to provide a light source module and lighting device to solve the problem that although the color rendering index (CRI) of current LED light sources is close to that of daylight, the light color is bluish and not the best light color effect.

[0005] To achieve the above objectives, the embodiments in this specification adopt the following technical solutions:

[0006] In a first aspect, a light source module is provided, comprising multiple phosphors, wherein the multiple phosphors include at least a first phosphor, a second phosphor, a third phosphor, and a fourth phosphor; the first phosphor is configured to emit a first color light with a peak wavelength of 485-515 nm after excitation, the second phosphor is configured to emit a second color light with a peak wavelength of 520-580 nm after excitation, the third phosphor is configured to emit a third color light with a peak wavelength of 615-655 nm after excitation, and the fourth phosphor is configured to emit a fourth color light with a peak wavelength of 660-700 nm after excitation;

[0007] The light source module is configured to emit colored light in a quadrilateral color gamut region enclosed by color points A (0.367±0.002, 0.352±0.002), B (0.371±0.002, 0.368±0.002), C (0.378±0.002, 0.368±0.002), and D (0.387±0.002, 0.364±0.002) in the CIE 1931 color coordinate system. The colored light includes the first colored light, the second colored light, the third colored light, and the fourth colored light.

[0008] Optionally, the first phosphor comprises a blue-green phosphor, the second phosphor comprises a yellow-green phosphor, the third phosphor comprises a red-orange phosphor, and the fourth phosphor comprises a dark red phosphor.

[0009] Optionally, the blue-green phosphor is (Ba,Sr)Si2N2O2:Eu.

[0010] Optionally, the yellow-green phosphor is (Lu,Yb,Tb)3(Al,Ga)5O 12 Ce、Y3(Al,Ga)5O 12 Ce、Ga-Y3Al5O 12 One or more combinations of Ce, (Ba,Sr,Ca,Mg)SiO4:Eu.

[0011] Optionally, the red-orange phosphor is CaAlSiN3:Eu, (Ca,Sr)AlSiN3:Eu, (Ba,Sr,Ca,Mg)2Si5N8:Eu, or K2SiF6:Mn. 4+ K2GeF6:Mn 4+ K2TiF6:Mn 4+ One or more combinations thereof.

[0012] Optionally, the deep red phosphor is CaAlSiN3:Eu or Ca3Al2Ge3O. 12 A combination of one or two of Eu.

[0013] Optionally, the light source module includes at least two blue light chips for exciting various phosphors. The blue light chips include at least a first blue light chip and a second blue light chip. The peak wavelength of the first blue light chip is 460-475nm, and the peak wavelength of the second blue light chip is 445-460nm.

[0014] Optionally, the number of the first blue light chip is one or more; the number of the second blue light chip is one or more.

[0015] Optionally, the blue light chip further includes a third blue light chip, the peak wavelength of which is 430-445nm, and the number of the third blue light chips is one or more.

[0016] In a second aspect, a lighting device is provided, comprising the light source module described in the first aspect.

[0017] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0018] This specification provides a light source module and lighting device. By setting various phosphors, in addition to having a high color rendering index (CRI) (Ra>95), it also takes into account a better color preference index (MCPI) and color resolution index (CDM). Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 The spectral comparison diagrams are shown for the light-emitting light sources obtained by using different phosphor ratios in Examples 9, 11, and Comparative Example 1.

[0021] Figure 2 The color coordinate range diagrams are for the light sources obtained by using different phosphor ratios in Examples 1-11 and Comparative Example 1.

[0022] Figure 3 This refers to the blackbody radiation spectrum in existing technologies;

[0023] Figure 4 The spectrum of the D-series standard light source in existing technology;

[0024] Figure 5 This is a schematic diagram of the specific packaging structure of the lighting device in this embodiment. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] This specification provides a light source whose color gamut in the CIE1931 color coordinate system is a quadrilateral region enclosed by color points A (0.365±0.002, 0.347±0.002), B (0.368±0.002, 0.364±0.002), C (0.387±0.002, 0.374±0.002), and D (0.387±0.002, 0.358±0.002).

[0028] By setting the color gamut range of the light source in the CIE1931 color coordinate system, in addition to the performance of a high color rendering index (CRI) (Ra>95), it also takes into account the better color preference index (MCPI) and color resolution index (CDM).

[0029] In this embodiment, the emission spectrum of the light source has a first peak wavelength of 420-500 nm, a second peak wavelength of 500-560 nm, a third peak wavelength of 560-610 nm, a fourth peak wavelength of 610-660 nm, and a fifth peak wavelength of 660-700 nm. With the spectral relative intensity of the highest peak wavelength as 100%, the spectral relative intensity of the first peak wavelength is 50%~85%; the spectral relative intensity of the second peak wavelength is 50%~75%; the spectral relative intensity of the third peak wavelength is 70%~95%; the spectral relative intensity of the fourth peak wavelength is 90%~100%; and the spectral relative intensity of the fifth peak wavelength is 50%~90%.

[0030] In this embodiment, the light source includes a phosphor composition and at least two blue light chips for exciting the phosphor composition; the phosphor composition includes at least one blue-green phosphor with a peak wavelength of 485-515nm, at least one yellow-green phosphor with a peak wavelength of 520-580nm, at least one red-orange phosphor with a peak wavelength of 615-655nm, and at least one deep red phosphor with a peak wavelength of 655-700nm.

[0031] In this embodiment, the two blue light chips among the at least two types used to excite the phosphor composition are a first blue light chip and a second blue light chip. The peak wavelength of the first blue light chip is 460-475nm, and there are one or more first blue light chips. The peak wavelength of the second blue light chip is 445-460nm, and there are one or more second blue light chips. The purpose of using multiple blue light chips is to disperse the energy within the blue light band, making its distribution more even and closer to the spectrum of a standard light source, thereby improving the light quality of the white light source produced.

[0032] In this embodiment, the blue light chip further includes a third blue light chip, the peak wavelength of which is 430-445nm, and the number of the third blue light chips is one or more.

[0033] The peak wavelength difference between any two of the first, second, and third blue light chips is greater than 10 nm. In this embodiment, the light source may include a combination of one first blue light chip, one second blue light chip, and one third blue light chip; a combination of one first blue light chip and one second blue light chip; or a combination of one first blue light chip, two second blue light chips, and one third blue light chip.

[0034] The light source is a combination of a phosphor composition and at least two blue light chips used to excite the phosphor composition. Since the energy distribution (half-width) of a single phosphor excited by blue light is limited, in order to make up for the energy of multiple bands constituting high-quality white light, it is necessary to use blue light to excite phosphors of various material systems to obtain the corresponding color band distribution, so that the overall white light spectrum can be close to the standard light source spectrum.

[0035] In this embodiment, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu. The yellow-green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O. 12 Ce、Y3(Al,Ga)5O 12 Ce、Ga-Y3Al5O 12 The red-orange phosphor is one or a combination of Ce, (Ba,Sr,Ca,Mg)SiO4:Eu. The red-orange phosphor is CaAlSiN3:Eu, (Ca,Sr)AlSiN3:Eu, (Ba,Sr,Ca,Mg)2Si5N8:Eu, or K2SiF6:Mn. 4+ K2GeF6:Mn 4+K2TiF6:Mn 4+ One or more of the following. The deep red phosphor is CaAlSiN3:Eu, Ca3Al2Ge3O 12 A combination of one or two of Eu.

[0036] In this embodiment, the content of each component of the blue-green phosphor, the yellow-green phosphor, the red-orange phosphor, and the dark red phosphor in the phosphor composition is as follows (by mass fraction): blue-green phosphor 15-25%, yellow-green phosphor 25-35%, red-orange phosphor 25-32%, and dark red phosphor 15-25%.

[0037] From a spectral perspective, increasing blue energy helps improve the whiteness of the light source, thereby enhancing the light source's ability to distinguish the color of the illuminated object. Conversely, increasing red energy improves the comfort of the light source's color, thus increasing the light source's preference for the color of the illuminated object. On the other hand, it can also be understood that with blue and red remaining essentially unchanged, decreasing green energy (including yellow) will help improve color preference and resolution. This invention optimizes the content of each component in the phosphor composition.

[0038] In this embodiment, when the deep red phosphor is CaAlSiN3:Eu or Ca3Al2Ge3O 12 When the two are combined, CaAlSiN3:Eu and Ca3Al2Ge3O 12 The Eu content is as follows (by mass fraction): CaAlSiN3:Eu 0-10%, Ca3Al2Ge3O 12 Eu 10-20%.

[0039] In this embodiment, the light source is an LED light source, and the preparation method of the light source can adopt conventional preparation methods in the prior art. For example... Figure 5 As shown, the light source can be packaged with or without a support frame, specifically consisting of a blue LED chip, a phosphor composition (phosphor mixture), a sealing colloid, a metal sheet, and a plastic or ceramic non-metallic support. The LED chip is covered with an encapsulation (phosphor mixture and sealing colloid). The LED chip can be upright or flip-chip, and a single LED chip or multiple LED chips can be connected together in series, parallel, or series-parallel configurations.

[0040] In this embodiment, to accommodate the package, the main body of the LED light source is a non-metallic support made of materials such as plastic, with an internal receiving groove. The non-metallic support can be made of any of PPA, PCT, or EMC. The LED chip is placed in the receiving groove and has a pair of leads (metal sheets), which are electrically isolated from each other. The sealing colloid can be made of silicone resin, epoxy resin, or a combination thereof, and is filled into the receiving groove and covers the LED chip.

[0041] Furthermore, there are no restrictions on the arrangement and order of the LED chips in the receiving slot; the arrangement can be horizontal side by side, etc.

[0042] The package contains a phosphor mixture. LED chips are connected in series or parallel and placed in the receiving groove. The light emitted by the chips excites the phosphor mixture to produce white light.

[0043] In this embodiment, the packaging form of the light source can be PLCC surface mount package, ceramic surface mount package, CSP package, multi-in-one single surface mount package or COB chip integrated package, and this application does not limit it.

[0044] This specification provides a light source module, including the aforementioned light-emitting light source.

[0045] The light source module includes multiple phosphors, including at least a first phosphor, a second phosphor, a third phosphor, and a fourth phosphor. The first phosphor is configured to emit a first color light with a peak wavelength of 485-515 nm after being excited; the second phosphor is configured to emit a second color light with a peak wavelength of 520-580 nm after being excited; the third phosphor is configured to emit a third color light with a peak wavelength of 615-655 nm after being excited; and the fourth phosphor is configured to emit a fourth color light with a peak wavelength of 660-700 nm after being excited.

[0046] The light source module is configured to emit colored light in a quadrilateral color gamut region enclosed by color points A (0.367±0.002, 0.352±0.002), B (0.371±0.002, 0.368±0.002), C (0.378±0.002, 0.368±0.002), and D (0.387±0.002, 0.364±0.002) in the CIE 1931 color coordinate system. The colored light includes the first colored light, the second colored light, the third colored light, and the fourth colored light.

[0047] In this embodiment, the first phosphor comprises a blue-green phosphor, the second phosphor comprises a yellow-green phosphor, the third phosphor comprises a red-orange phosphor, and the fourth phosphor comprises a dark red phosphor.

[0048] In this embodiment, the light source module includes at least two types of blue light chips for exciting various phosphors. Each blue light chip includes at least a first blue light chip and a second blue light chip. The peak wavelength of the first blue light chip is 460-475 nm; the peak wavelength of the second blue light chip is 445-460 nm. The number of the first blue light chip and the number of the second blue light chip are one or more.

[0049] In this embodiment, the blue light chip further includes a third blue light chip, the peak wavelength of which is 430-445nm, and the number of the third blue light chips is one or more.

[0050] This specification provides an embodiment of a lighting device, including the aforementioned light source module.

[0051] In this embodiment, the lighting device includes a light source module and a driving circuit, wherein the light source module includes the aforementioned light-emitting unit, and the driving circuit is connected to and supplies power to the light source module.

[0052] The performance of the light source module of this utility model is compared with that of a general full-spectrum LED light source in Table 1 below.

[0053] Table 1

[0054]

[0055] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0056] Example 1:

[0057] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0058] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 23.3%, green phosphor 27.9%, red phosphor 25.6%, first deep red phosphor 6.6%, and second deep red phosphor 16.6%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0059] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light source A-1.

[0060] Example 2:

[0061] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0062] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are: blue-green phosphor 20.8%, green phosphor 32.8%, red phosphor 30.7%, first deep red phosphor 3.8%, and second deep red phosphor 11.9%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0063] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting source A-2.

[0064] Example 3:

[0065] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0066] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 24.7%, green phosphor 28.9%, red phosphor 26.5%, first deep red phosphor 4.5%, and second deep red phosphor 15.5%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0067] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light source A-3.

[0068] Example 4:

[0069] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0070] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 23.0%, green phosphor 32.2%, red phosphor 29.5%, first deep red phosphor 1.9%, and second deep red phosphor 13.4%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0071] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting source A-4.

[0072] Example 5:

[0073] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0074] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 20.1%, green phosphor 33.9%, red phosphor 29.2%, first deep red phosphor 4.0%, and second deep red phosphor 12.8%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0075] The phosphor composition is packaged with a third blue light chip with a peak wavelength of 435nm, a second blue light chip with a peak wavelength of 450nm, and a first blue light chip with a peak wavelength of 465nm to form a light-emitting light source A-5.

[0076] Example 6:

[0077] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0078] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 22.6%, green phosphor 29.1%, red phosphor 26.4%, first deep red phosphor 4.8%, and second deep red phosphor 17.1%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O12 :Eu.

[0079] The phosphor composition is packaged with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light source A-6.

[0080] Example 7:

[0081] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0082] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 22.3%, green phosphor 31.3%, red phosphor 26.5%, first deep red phosphor 2.7%, and second deep red phosphor 17.2%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0083] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting light source A-7.

[0084] Example 8:

[0085] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0086] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 21.1%, green phosphor 29.8%, red phosphor 26.7%, first deep red phosphor 6.8%, and second deep red phosphor 15.5%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0087] The phosphor composition is packaged with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light source A-8.

[0088] Example 9:

[0089] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0090] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 24.2%, green phosphor 31.7%, red phosphor 29.1%, first deep red phosphor 1.9%, and second deep red phosphor 13.2%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0091] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting source A-9.

[0092] Example 10:

[0093] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0094] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 17.0%, green phosphor 37.0%, red phosphor 28.3%, first deep red phosphor 2.6%, and second deep red phosphor 15.1%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0095] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting light source A-10.

[0096] Example 11:

[0097] This specification provides a light source comprising a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip. The first blue light chip has a peak wavelength of 465 nm, the second blue light chip has a peak wavelength of 450 nm, and the third blue light chip has a peak wavelength of 435 nm.

[0098] The phosphor composition comprises a blue-green phosphor, a green phosphor, a red phosphor, a first deep red phosphor, and a second deep red phosphor. The mass percentages of each component in the phosphor composition are as follows: blue-green phosphor 24.0%, green phosphor 29.7%, red phosphor 25.4%, first deep red phosphor 4.7%, and second deep red phosphor 16.1%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12Ce, the red phosphor is (Ca,Sr)AlSiN3:Eu, the first deep red phosphor is CaAlSiN3:Eu, and the second deep red phosphor is Ca3Al2Ge3O 12 :Eu.

[0099] The phosphor composition is packaged with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting light source A-11.

[0100] Comparison Example 1:

[0101] This comparative example provides a light source including a phosphor composition, a first blue light chip, a second blue light chip, and a third blue light chip, wherein the peak wavelength of the first blue light chip is 465 nm, the peak wavelength of the second blue light chip is 450 nm, and the peak wavelength of the third blue light chip is 435 nm.

[0102] The phosphor composition includes a blue-green phosphor, a green phosphor, and a red phosphor. The mass percentages of each component in the phosphor composition are: blue-green phosphor 24.0%, green phosphor 29.7%, and red phosphor 25.4%. Specifically, the blue-green phosphor is (Ba,Sr)Si₂N₂O₂:Eu, and the green phosphor is (Lu,Yb,Tb)₃(Al,Ga)₅O₂. 12 The red phosphor is (Ca,Sr)AlSiN3:Eu.

[0103] The phosphor composition is encapsulated with a third blue light chip with a peak wavelength of 435 nm, a second blue light chip with a peak wavelength of 450 nm, and a first blue light chip with a peak wavelength of 465 nm to form a light-emitting source A.

[0104] To illustrate the specific composition of each light source and phosphor composition prepared in Examples 1-11 and Comparative Example 1, the components of the above examples are listed in Table 2.

[0105] Table 2

[0106]

[0107] Table 3 shows the basic characteristic parameters of the light source obtained by using different phosphor composition ratios in Examples 1-11 and Comparative Example 1. These parameters are also the parameters of the neutral white light source, corresponding to each specific embodiment. Figure 1 The image shows a comparison of the light sources obtained by using different phosphor ratios in Examples 9, 11, and Comparative Example 1.

[0108] Table 3

[0109]

[0110] The region that simultaneously meets the following four points is the preferred solution of this embodiment: (1) CRI (Ra) 95; (2) MCPI 107.5; (3) CDM 4.6; (4) Red light ratio 0.052; (5) Proportion of deep red light 0.055; (6) Spectral fit Between 85%. Figure 3 The color coordinate range diagrams of light sources obtained by using different phosphor ratios in Examples 1-11 and Comparative Example 1 are shown. Figure 3 The specific color coordinate values ​​of A, B, C, and D are shown in Table 4 below:

[0111] Table 4

[0112] .

[0113] According to Table 2, Figure 1 and Figure 2 From a spectral distribution perspective, firstly, the addition of deep red energy to the phosphor composition effectively expands the absolute color gamut covered by the light source, resulting in better color quality. The overall increase in red energy also enhances the comfort of the light source's color. Together, these factors improve the light source's color preference for illuminated objects. Secondly, the increase in blue energy from the blue LED chip also helps improve the light source's whiteness, indirectly increasing the contrast between different illuminated object colors, thereby improving the light source's color resolution. On the other hand, it can also be understood that with blue and red remaining essentially unchanged, the decrease in green energy (including yellow) contributes to improved color preference and resolution. Compared to general full-spectrum white LED light sources, this invention significantly increases the proportion of deep red light, further enhancing the similarity of its spectrum to the D-series standard light source spectrum (generally understood as the daylight spectrum).

[0114] In the above performance tests, the metrics are defined as follows:

[0115] 1. Standard light source spectrum

[0116] <4000K: Blackbody radiation spectrum is used as the target spectrum.

[0117] The blackbody radiation spectrum at different color temperatures (T) and blackbody radiation spectra (Sr) conforms to the following relationship:

[0118] Where T represents relative color temperature, where λ is the wavelength of the radiation, h is Planck's constant, and c is the speed of light (3 x 10⁻⁶). 8 m / s), K is the Boltzmann constant, T b is the absolute temperature of the blackbody. Figure 3 This refers to the blackbody radiation spectrum in existing technologies. Figure 4 This refers to the spectrum of the D-series standard light source in existing technology.

[0119] 4000K: The target spectrum is the relative spectral distribution of the D-series standard light source specified by the International Commission on Illumination (CIE), such as D50, D65, etc.

[0120] The following is the calculation method for obtaining the spectrum of a standard light source. First, the color coordinates (x, y, y) of the D-series standard light source corresponding to the target color temperature must be obtained. D ,y D ).

[0121] if T 7000K,

[0122]

[0123] If T 7000K,

[0124]

[0125] Where K represents the unit of T (Kelvin).

[0126] Furthermore, calculate the yD value:

[0127] ,

[0128] After obtaining (xD, yD), the relative spectrum Sr(λ) of the D-series standard light source can be obtained using the following formula:

[0129] .

[0130] in:

[0131] ;

[0132] ;

[0133] S0( ): Average spectral power distribution at a typical solar wavelength λ;

[0134] S1( S2( ): The two most important eigenvectors of all sets of sunlight distributions.

[0135] All of the above are basis functions with a spacing of 5nm wavelength.

[0136] 2. SFR (Spectral Fit)

[0137] Spectral Fitting Ratio (SFR) is used to evaluate the degree of fit between the measured spectrum and the target spectrum. It is based on the Average Spectral Difference (ASD) published by Bridgelux Inc. (USA) to calculate the spectral deviation ratio. The reference light source used is similar to the TM-30 standard published by the Illuminating Engineering Society of North America (IES). When the color temperature is above 5000K, the reference spectrum is based on the D-series standard illuminator. When the color temperature is below 4000K, the spectrum emitted by a blackbody radiation source is used as the reference. If the color temperature is between 4000K and 5000K, the spectrum emitted by a mixed light source of 4000K blackbody radiation and a D50 standard illuminator is used as the reference. Furthermore, considering the band distribution of human visual response, the evaluation range of spectral deviation is limited to between 425nm and 690nm. The specific calculation method is as follows:

[0138] Where φref is the relative intensity of the reference light source, φ is the relative intensity of the light source to be evaluated, and λ is the wavelength.

[0139] 3. Rr (Red Light Ratio)

[0140] To effectively assess the proportion of red light in the spectrum, this invention employs the following method:

[0141] The red ratio (Rr) represents the proportion of red light in the measured spectrum (between 620nm and 650nm) when the illuminance of the light source is fixed at 100 lux. The wavelength spacing used in the above calculation is 5nm.

[0142] 4. DRR (Deep Red Light Ratio)

[0143] To effectively evaluate the proportion of deep-red light in the spectrum, this invention adopts the following method: Deep-Red Ratio (DRr) represents the proportion of illuminance in the deep-red band in the spectrum to be measured (between 650nm and 690nm) when the illuminance of the light source is fixed at 100 lux. The wavelength interval used in the above calculation is 5nm.

[0144] 5. MCPI (Color Preference Index)

[0145] The MCPI (Color Preference Index based on Meta-analysis) represents the ability of a light source to satisfy an observer's color preferences under one or more specific application conditions. In other words, this index can be used to scientifically evaluate which light source's color rendering effect is more able to meet the needs of visual perception.

[0146] .in: The color quality scale (CQS) is a light source fidelity index developed by the National Institute of Standards and Technology (NIST). Qa is one of the output indicators of CQS. The light gamut index is a metric based on absolute color gamut used to evaluate the color discrimination capability of a light source.

[0147] 6. CDM (Color Discrimination Index)

[0148] The CDM (Color Discrimination Metric) represents the degree to which a light source allows an observer to distinguish color differences. It is designed to characterize the human eye's ability to distinguish differences in the color, brightness, and saturation of objects under different light sources.

[0149] .in: The light source whiteness index prediction model calculates the whiteness index of the light source under test in the CIE1976 UCS uniform color space. The light intensity chromaticity index indicates the number of hue misalignments caused by the test light source. It is calculated by using the CIE C standard light source as the actual reference and calculating based on the hue error score.

[0150] This invention is developed based on full-spectrum LED light sources, redefining high-quality white LED light sources suitable for visual perception. In addition to a high color rendering index (CRI) of Ra>95, the light source obtained by this invention also boasts a good color preference index (MCPI) and color resolution index (CDM). Currently, in terms of matching the full-spectrum LED with the sunlight spectrum (400-700nm in the visible light range), regardless of whether it's violet LED excitation or blue LED excitation of various phosphor methods, there is still a significant gap in the deep red light band, especially between 650-700nm. Therefore, this invention compensates for the energy in this band, further improving its closeness to the sunlight spectrum to achieve a lighting effect similar to sunlight.

[0151] This invention sacrifices a small portion of the color rendering index and reduces physical data by increasing red light energy, optimizing spectral fit and ultimately achieving better light source preference and resolution, thus enhancing visual perception. The proportion of deep red light is also increased, achieving the goal of incorporating visual protection elements. This invention adds deep red phosphor to the full spectrum to obtain better visual perception parameters (MCPI & CDM). Furthermore, since the deep red light band has a significant effect on slowing down the elongation of the eye axis, the addition of deep red light can play a role in myopia prevention.

[0152] By combining phosphor compositions with different components and proportions and blue light chips to form a light-emitting unit, the neutral white light 4000K obtained by the light-emitting unit has the following advantages: although a small portion of the color rendering index is sacrificed, the visual perception of the light source is improved and its resolution is enhanced; the full-spectrum quality described by the single dimension of color rendering index is improved to a new definition of full-spectrum light quality that not only has high color rendering, but also meets the visual perception, namely color preference and color resolution.

[0153] Some research literature indicates that deep red light has a certain preventive effect on abnormal elongation of the human eye axis, which is a cause of myopia. Therefore, this invention is also helpful in the prevention and control of myopia.

[0154] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A light source module, characterized by The device includes multiple phosphors, including at least a first phosphor, a second phosphor, a third phosphor, and a fourth phosphor. The first phosphor is configured to emit a first color light with a peak wavelength of 485-515 nm after excitation, the second phosphor is configured to emit a second color light with a peak wavelength of 520-580 nm after excitation, the third phosphor is configured to emit a third color light with a peak wavelength of 615-655 nm after excitation, and the fourth phosphor is configured to emit a fourth color light with a peak wavelength of 660-700 nm after excitation. The light source module is configured to emit colored light in a quadrilateral color gamut region enclosed by color points A (0.367±0.002, 0.352±0.002), B (0.371±0.002, 0.368±0.002), C (0.378±0.002, 0.368±0.002), and D (0.387±0.002, 0.364±0.002) in the CIE 1931 color coordinate system. The colored light includes the first colored light, the second colored light, the third colored light, and the fourth colored light.

2. The light source module of claim 1, wherein The first phosphor comprises a blue-green phosphor, the second phosphor comprises a yellow-green phosphor, the third phosphor comprises a red-orange phosphor, and the fourth phosphor comprises a dark red phosphor.

3. The light source module of claim 2, wherein The blue-green phosphor is (Ba,Sr)Si2N2O2:Eu.

4. The light source module of claim 2, wherein The yellow-green fluorescent powder is a combination of one or more of (Lu, Yb, Tb)3(Al, Ga)50 12 :Ce, Y3(Al, Ga)50 12 :Ce, Ga-Y3Al50 12 :Ce, (Ba, Sr, Ca, Mg)Si04:Eu.

5. The light source module of claim 2, wherein the light source module is configured to be mounted on a printed circuit board (PCB) of a display device. The red-orange phosphors are CaAlSiN3:Eu, (Ca,Sr)AlSiN3:Eu, (Ba,Sr,Ca,Mg)2Si5N8:Eu, and K2SiF6:Mn. 4+ K2GeF6:Mn 4+ K2TiF6:Mn 4+ One or more combinations thereof.

6. The light source module of claim 2, wherein The deep red phosphor is CaAlSiN3:Eu, Ca3Al2Ge3O 12 A combination of one or two of Eu.

7. The light source module of claim 1, wherein The light source module includes at least two types of blue light chips for exciting various phosphors. The blue light chips include at least a first blue light chip and a second blue light chip. The peak wavelength of the first blue light chip is 460-475nm, and the peak wavelength of the second blue light chip is 445-460nm.

8. The light source module according to claim 7, characterized in that, The number of the first blue light chip is one or more; the number of the second blue light chip is one or more.

9. The light source module of claim 7, wherein the light source module is configured to be mounted on a printed circuit board (PCB) of a display device. The blue light chip also includes a third blue light chip, the peak wavelength of which is 430-445nm, and the number of the third blue light chips is one or more.

10. An illumination device, characterized by Includes the light source module as described in claim 9.

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