LED lamp bead and LED light source

Abstract

This application provides an LED bead and an LED light source, including an LED chip and a photoluminescent film. The photoluminescent film is located on the LED chip and has at least a quantum dot layer containing at least red, yellow, green, cyan, and blue quantum dots. This application prepares the quantum dot layer by mixing quantum dots of various colors in a colloid. The quantum dots exhibit comprehensive and pure colors, allowing for the mixing of full-spectrum products with multiple color temperatures. Furthermore, the quantum dots are at the nanometer scale, and their fluidity and distribution uniformity in the colloid are significantly better than those of phosphors in the colloid. Therefore, the quantum dot layer in this application has good concentration and can emit full-spectrum light close to the solar spectrum when excited by the excitation light emitted from the LED chip.

Description

Technical Field

[0001] This application relates to the field of optoelectronic technology, and in particular to an LED lamp bead and an LED light source. Background Technology

[0002] LED (Light Emitting Diode) chips typically consist of a stacked structure of an LED chip and a photoluminescent film. Currently, photoluminescent films are usually fluorescent films, which are mixtures of phosphors and adhesives. To produce a full-spectrum fluorescent film from a standard fluorescent film, the limited variety of phosphors available makes it difficult to achieve, and the high concentration after mixing multiple phosphors makes it difficult to control the uniformity of the phosphors, resulting in poor concentration and low yield. Utility Model Content

[0003] This application provides an LED lamp bead and an LED light source to solve the problems of poor concentration and low yield of existing full-spectrum fluorescent films.

[0004] The first aspect of this application provides an LED lamp bead, comprising:

[0005] LED chips; and,

[0006] A photoluminescent film is located on the LED chip. The photoluminescent film has at least a quantum dot layer (12), and the quantum dot layer contains at least red quantum dots, yellow quantum dots, green quantum dots, cyan quantum dots and blue quantum dots.

[0007] In some embodiments, the quantum dot layer further comprises at least one of orange quantum dots and purple quantum dots.

[0008] In some embodiments, the quantum dot layer further comprises at least one of infrared quantum dots and ultraviolet quantum dots; and / or, the quantum dots in the quantum dot layer are all spherical, and the particle size range of the quantum dots is 2nm to 20nm.

[0009] In some embodiments, the quantum dot layer has at least two depth regions, each depth region being located at a different depth of the quantum dot layer, each depth region having quantum dots of at least one color, and in two adjacent depth regions, the quantum dots in the depth region closer to the LED chip have a longer excitation wavelength.

[0010] In some embodiments, the depth region includes a first depth region, a second depth region, and a third depth region stacked sequentially from bottom to top, wherein the first depth region contains at least red quantum dots and yellow quantum dots, the second depth region contains at least green quantum dots and cyan quantum dots, and the third depth region contains at least blue quantum dots.

[0011] In some embodiments, the first depth region also contains orange quantum dots; and / or, the third depth region also contains purple quantum dots.

[0012] In some embodiments, the photoluminescent film further includes a fully cured transparent adhesive layer and / or a semi-cured transparent adhesive layer, wherein the fully cured transparent adhesive layer surrounds the upper surface and side surface of the quantum dot layer, and the semi-cured transparent adhesive layer is disposed on the lower surface of the quantum dot layer.

[0013] In some embodiments, the thickness of the photoluminescent film is 80 μm to 200 μm; and / or, the LED chip is a blue LED chip or a violet LED chip.

[0014] In some embodiments, the blue LED chip emits blue light with a wavelength having at least one peak, and the violet LED chip emits violet light with a wavelength having at least one peak.

[0015] This application also provides an LED light source, including the LED beads.

[0016] This application provides an LED bead and an LED light source, including an LED chip and a photoluminescent film. The photoluminescent film is located on the LED chip and has at least a quantum dot layer containing at least red, yellow, green, cyan, and blue quantum dots. This application prepares the quantum dot layer by mixing quantum dots of various colors in a colloid. The quantum dots exhibit comprehensive and pure colors, allowing for the mixing of full-spectrum products with multiple color temperatures. Furthermore, the quantum dots are at the nanometer scale, and their fluidity and distribution uniformity in the colloid are significantly better than those of phosphors in the colloid. Therefore, the quantum dot layer in this application has good concentration and can emit full-spectrum light close to the solar spectrum when excited by the excitation light emitted from the LED chip. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.

[0018] Figure 1 The diagram shown is a cross-sectional view of an LED bead according to an embodiment of this application.

[0019] Figure 2 The diagram shown is a cross-sectional view of a photoluminescent film according to an embodiment of this application.

[0020] Figure 3 The figure shown is a planar schematic diagram of a quantum dot layer according to an embodiment of this application.

[0021] Figure 4 As shown Figure 3 A schematic diagram of a cross-sectional structure of a quantum dot layer along cutting line A1-A2.

[0022] Figure 5 The diagram shown is a cross-sectional view of an LED bead according to another embodiment of this application. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] This application provides an LED lamp bead and an LED light source to solve the problems of poor concentration and low yield of existing full-spectrum fluorescent films. It also addresses the issues of uneven quantum dot distribution and unsatisfactory light mixing in existing photoluminescent films. The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0025] Figure 1 The diagram shown is a cross-sectional view of an LED bead according to an embodiment of this application. Figure 2 The diagram shown is a cross-sectional view of a photoluminescent film according to an embodiment of this application. Please refer to the accompanying documentation. Figure 1 and Figure 2 The LED bead includes an LED chip 13 and a photoluminescent film 11, with the photoluminescent film 11 located on the LED chip 13. Specifically, the LED chip 13 has a light-emitting surface and a backlight surface, and the photoluminescent film 11 is disposed on the light-emitting surface of the LED chip 13. The lower surface of the photoluminescent film 11 is bonded to the light-emitting surface of the LED chip 13, and the photoluminescent film 11 can be bonded to the light-emitting surface of the LED chip 13 using an adhesive.

[0026] Figure 3 The figure shown is a planar schematic diagram of the quantum dot layer 12 according to an embodiment of this application. Figure 4 As shown Figure 3 A schematic diagram of a cross-sectional structure of quantum dot layer 12 along cutting lines A1-A2. Please refer to the attached diagram. Figure 3 and Figure 4The photoluminescent film 11 has at least a quantum dot layer 12. The quantum dot layer 12 contains at least red quantum dots 121, yellow quantum dots 122, green quantum dots 123, cyan quantum dots 124, and blue quantum dots 125. The quantum dot layer 12 is formed by mixing quantum dots of multiple colors in a colloid. The quantum dots have comprehensive and pure colors, allowing for the mixing of full-spectrum products with multiple color temperatures. Furthermore, the quantum dots are at the nanometer scale, and their fluidity and uniform distribution in the colloid are significantly better than those of phosphors in the colloid. Therefore, the quantum dot layer 12 in this application has good concentration, and under the excitation light emitted by the LED chip 13, it can emit full-spectrum light close to the solar spectrum. Further, by setting this structure of the photoluminescent film 11 on the light-emitting surface of the LED chip 13, the light emitted by the LED chip 13 can excite the quantum dot layer 12 inside the photoluminescent film 11 to produce uniformly mixed light of multiple colors, effectively improving the color rendering performance of the LED bead 10.

[0027] In one embodiment, the LED chip 13 includes either a blue LED chip or a violet LED chip. By setting the LED chip 13 to either a blue LED chip or a violet LED chip, the blue light emitted by the blue LED chip or the violet light emitted by the violet LED chip can be used to excite the photoluminescent film 11 to generate sunlight-like light.

[0028] In one embodiment, the blue LED chip emits blue light in the wavelength range of 450nm to 470nm (inclusive), and the violet LED chip emits violet light in the wavelength range of 400nm to 420nm (inclusive). For example, the blue LED chip can emit blue light at any wavelength selected from 450nm, 460nm, and 470nm. Similarly, the violet LED chip can emit violet light at any wavelength selected from 400nm, 410nm, and 420nm. This application does not limit the wavelengths of blue light emitted by the blue LED chip or violet light emitted by the violet LED chip, as long as both are within their respective wavelength ranges.

[0029] In one embodiment, the blue LED chip emits blue light with a wavelength having at least one peak, and the violet LED chip emits violet light with a wavelength having at least one peak. For example, the blue LED chip emits blue light with a wavelength having one peak, two or more peaks, and the violet LED chip emits violet light with one peak, two or more peaks.

[0030] Taking a blue LED chip as an example, when the wavelength of the blue light emitted by the blue LED chip has one peak, two or more peaks, the blue light emitted by the blue LED chip can excite the photoluminescent film 11 to produce sunlight-like light. The difference in producing sunlight-like light is that when the wavelength of the blue light emitted by the blue LED chip has one peak, the blue light energy is more concentrated, and the intensity of the blue light in the spectrum of the sunlight-like light produced by the photoluminescent film 11 excited by the blue light is strong and sharp. When the wavelength of the blue light emitted by the blue LED chip has two or more peaks, the energy distribution of the blue light is dispersed, and the two or more peaks of the blue light wavelength are more continuous in the range of 450nm to 470nm. The intensity of the blue light in the spectrum of the sunlight-like light produced by the photoluminescent film 11 excited by the blue light is reduced and softer.

[0031] In one embodiment, the quantum dot layer 12 further includes at least one of orange quantum dots 126 and purple quantum dots 127.

[0032] When the quantum dot layer 12 also contains orange quantum dots 126, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can further contain orange light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight.

[0033] When the quantum dot layer 12 also contains purple quantum dots 127, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can further contain purple light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight.

[0034] When the quantum dot layer 12 also contains orange quantum dots 126 and purple quantum dots 127, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can further contain orange and purple light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight.

[0035] In one embodiment, the quantum dot layer 12 further comprises at least one of infrared quantum dots and ultraviolet quantum dots.

[0036] When the quantum dot layer 12 also contains infrared quantum dots, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can further include infrared light from the invisible light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight.

[0037] When the quantum dot layer 12 also contains ultraviolet quantum dots, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can further include ultraviolet light from the invisible light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight.

[0038] When the quantum dot layer 12 also contains infrared quantum dots and ultraviolet quantum dots, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can further include infrared and ultraviolet light from the invisible light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight.

[0039] Based on this, by setting at least one of infrared quantum dots and ultraviolet quantum dots in the quantum dot layer 12, the photoluminescent film 11, under the excitation of the LED chip 13, can generate not only red, yellow, green, cyan, and blue light and mix them to form white light, but also at least one of infrared and ultraviolet light. This makes the white light generated by the photoluminescent film 11 contain at least one of the invisible infrared and ultraviolet light, thereby making the spectral characteristics of the white light closer to the spectral characteristics of sunlight, thus constituting sunlight-like light.

[0040] Preferably, when the quantum dot layer 12 also contains orange quantum dots 126, purple quantum dots 127, infrared quantum dots, and ultraviolet quantum dots, the photoluminescent film 11, under the excitation of the LED chip 13, can generate not only red, yellow, green, cyan, and blue light, but also orange, purple, infrared, and ultraviolet light, for a total of nine types of light. Since these nine types of light mix to form white light, and these nine types of light cover both the types of light that make up visible light and the types of light that make up invisible light, the spectral characteristics of this white light are essentially the same as the spectral characteristics of the full spectrum, and are closest to the solar spectrum among all the schemes in this application. Thus, the white light generated by the photoluminescent film 11 under the excitation of the LED chip 13 can be sunlight-like light with spectral characteristics closest to those of sunlight, and the photoluminescent film 11 can constitute a full-spectrum photoluminescent film.

[0041] In one implementation, please refer to Figure 3 and Figure 4 The quantum dots in quantum dot layer 12 are all spherical, and the particle size range of the quantum dots in quantum dot layer 12 is 2nm to 20nm (including the endpoint value).

[0042] Among them, the spherical shape includes, but is not limited to, spherical, ellipsoidal, polyhedral spherical, and cubic shapes. The particle size of the quantum dots can be any of 2nm, 5nm, 8nm, 10nm, 15nm, and 20nm. The particle size of the quantum dots can be selected and adjusted according to actual needs, as long as it is within the range of 2nm to 20nm. This application does not impose any restrictions on this.

[0043] In this application, since the quantum dots are all spherical and their particle size is in the range of 2nm to 20nm, it is beneficial to mix the quantum dots with the colloid during the preparation process and to control the thickness T of the photoluminescent film 11 more easily. This allows the quantum dots to be evenly distributed in the photoluminescent film 11 and ensures the uniformity of the thickness T of the photoluminescent film 11, thereby improving the color rendering performance and yield of the photoluminescent film 11.

[0044] In one embodiment, the thickness T of the photoluminescent film 11 ranges from 80 μm to 200 μm (inclusive). For example, the thickness T of the photoluminescent film 11 can be any of 80 μm, 90 μm, 100 μm, or 200 μm.

[0045] In practical applications, since there is an inverse relationship between the thickness T of the photoluminescent film 11 and the color temperature of the light generated by the photoluminescent film 11 under the excitation of the LED chip 13, that is, the thinner the photoluminescent film 11, the higher the color temperature of the light generated by it under excitation, and the thicker the photoluminescent film 11, the lower the color temperature of the light generated by it under excitation, by setting the thickness of the photoluminescent film 11 between 80μm and 200μm, the color temperature of the sunlight-like light generated by the photoluminescent film 11 under excitation can be within a suitable range.

[0046] It should be noted that from red quantum dot 121 to purple quantum dot 127, the excitation wavelength and particle size of the quantum dots gradually decrease, and the weight also gradually decreases. When preparing quantum dot layer 12, larger and heavier quantum dots are more likely to settle to the bottom of the colloidal layer. If the quantum dots are mixed randomly, it is easy to cause more quantum dots closer to red to settle, which will not reach the expected position and cause the mixing of light to fail to meet expectations.

[0047] Based on this, the quantum dot layer 12 in this application has at least two depth regions, each located at a different depth within the quantum dot layer 12. Each depth region contains quantum dots of at least one color. In adjacent depth regions, the quantum dots closer to the LED chip 13 have longer excitation wavelengths. That is, by mixing quantum dots of different excitation wavelengths in different depth regions, a uniform distribution of quantum dots within the quantum dot layer 12 is achieved. This arrangement of quantum dots allows the LED chip 13 to excite the quantum dots layer by layer, first exciting quantum dots with longer wavelengths, then those with shorter wavelengths. Since quantum dots with longer wavelengths have lower energy, they cannot excite quantum dots with shorter wavelengths, resulting in lower light loss and higher luminous efficiency. In other words, the LED chip 13 can excite the quantum dots in each depth region layer by layer, and each depth region produces multiple colors of light in a one-to-one correspondence, which is beneficial for the uniform mixing of multiple colors of light, thus achieving the expected effect of uniform light mixing.

[0048] For example, the quantum dots in each depth region are evenly distributed, such that the quantum dots in each depth region can be evenly dispersed, so that the interval between any two adjacent quantum dots in the corresponding depth region is set, and the distance between them is within a preset distance threshold range.

[0049] In one implementation, please refer to Figure 4 The quantum dot layer 12 includes a first depth region 12A, a second depth region 12B, and a third depth region 12C. The first depth region 12A is located at the bottom of the photoluminescent film 11, the second depth region 12B is located in the middle of the photoluminescent film 11, and the third depth region 12C is located at the top of the photoluminescent film 11. The excitation wavelength of the quantum dots in the first depth region 12A is greater than that in the second depth region 12B, and the excitation wavelength of the quantum dots in the second depth region 12B is greater than that in the third depth region 12C, which allows the quantum dots in the quantum dot layer 12 to conform to a partitioned arrangement pattern.

[0050] In one embodiment, the first depth region 12A includes a plurality of red quantum dots 121 and a plurality of yellow quantum dots 122, the second depth region 12B includes a plurality of green quantum dots 123 and a plurality of cyan quantum dots 124, and the third depth region 12C includes a plurality of blue quantum dots 125.

[0051] Among them, the excitation wavelengths of red quantum dots 121, yellow quantum dots 122, green quantum dots 123, cyan quantum dots 124 and blue quantum dots 125 increase sequentially. Multiple red quantum dots 121 and multiple yellow quantum dots 122 are uniformly distributed in the bottom region (first depth region 12A) of the photoluminescent film 11, multiple green quantum dots 123 and multiple cyan quantum dots 124 are uniformly distributed in the middle region (second depth region 12B) of the photoluminescent film 11, and multiple blue quantum dots 125 are uniformly distributed in the top region (third depth region 12C) of the photoluminescent film 11.

[0052] In the above scheme, since the excitation wavelengths of red quantum dots 121 and yellow quantum dots 122 are relatively large and the difference between their excitation wavelengths is small, the excitation wavelengths of green quantum dots 123 and cyan quantum dots 124 are both relatively small and the difference between their excitation wavelengths is small, while the excitation wavelength of blue quantum dots 125 is the smallest among the former, by setting the first depth region 12A to include multiple red quantum dots 121 and multiple yellow quantum dots 122, multiple red quantum dots 121 and multiple yellow quantum dots 122 can be uniformly distributed in the bottom region of the photoluminescent film 11, and the second depth region 12B includes multiple green quantum dots 121 and multiple yellow quantum dots 122. The presence of multiple green quantum dots 123 and multiple cyan quantum dots 124 allows for the uniform distribution of multiple green quantum dots 123 and multiple cyan quantum dots 124 in the central region of the photoluminescent film 11. The inclusion of multiple blue quantum dots 125 in a third depth region 12C allows for the uniform distribution of multiple blue quantum dots 125 in the top region of the photoluminescent film 11. Furthermore, the arrangement of multiple red quantum dots 121, multiple yellow quantum dots 122, multiple green quantum dots 123, multiple cyan quantum dots 124, and multiple blue quantum dots 125 conforms to a zoned arrangement pattern, which helps to reduce the number of zones, thereby simplifying the fabrication process and reducing costs. Furthermore, since the light generated by red quantum dots 121, yellow quantum dots 122, green quantum dots 123, cyan quantum dots 124, and blue quantum dots 125 can be mixed to form white light, and the wavelength and energy of the light generated by these quantum dots decrease sequentially, during the process of sequentially exciting the quantum dot layer 12 using an LED chip, longer wavelength and lower energy light will be generated first, followed by shorter wavelength and higher energy light. The earlier generated longer wavelength and lower energy light cannot further excite quantum dots that can produce shorter wavelengths. Therefore, a light mixing effect with low light loss and higher luminous efficiency can be achieved. Based on this, the LED beads of this application can achieve the expected light mixing effect of uniformly mixing white light, low light loss, and high luminous efficiency.

[0053] In one embodiment, the mass ratio between red quantum dot 121 and all types of quantum dots ranges from 10% to 20% (including endpoint values), the mass ratio between yellow quantum dot 122 and all types of quantum dots ranges from 20% to 40% (including endpoint values), the mass ratio between green quantum dot 123 and all types of quantum dots ranges from 20% to 40% (including endpoint values), the mass ratio between cyan quantum dot 124 and all types of quantum dots ranges from 5% to 10% (including endpoint values), and the mass ratio between blue quantum dot 125 and all types of quantum dots ranges from 5% to 10% (including endpoint values).

[0054] For example, the mass ratio between red quantum dot 121 and all types of quantum dots can be any value among 10%, 15%, and 20%; the mass ratio between yellow quantum dot 122 and all types of quantum dots can be any value among 20%, 30%, and 40%; the mass ratio between green quantum dot 123 and all types of quantum dots can be any value among 20%, 30%, and 40%; the mass ratio between cyan quantum dot 124 and all types of quantum dots can be any value among 5%, 8%, and 10%; and the mass ratio between blue quantum dot 125 and all types of quantum dots can be any value among 5%, 8%, and 10%. It should be noted that the mass ratios between the various colors of quantum dots and all types of quantum dots can be selected and adjusted according to actual needs. This application embodiment does not limit the mass ratios between the various colors of quantum dots and all types of quantum dots, as long as the mass ratios between the various colors of quantum dots and all types of quantum dots are within their respective mass ratio ranges.

[0055] The above scheme, by setting the mass ratio range between red quantum dot 121 and all types of quantum dots to be 10%–20%, yellow quantum dot 122 to all types of quantum dots to be 20%–40%, green quantum dot 123 to all types of quantum dots to be 20%–40%, cyan quantum dot 124 to all types of quantum dots to be 5%–10%, and blue quantum dot 125 to all types of quantum dots to be 5%–10%, allows red quantum dot 121 to generate [quantum density] under the excitation of an LED chip. The proportion of red light in the solar-like light ranges from 10% to 20%, the proportion of yellow light generated by the excitation of the LED chip by the yellow quantum dot 122 ranges from 20% to 40%, the proportion of green light generated by the excitation of the LED chip by the green quantum dot 123 ranges from 20% to 40%, the proportion of cyan light generated by the excitation of the LED chip by the cyan quantum dot 124 ranges from 5% to 10%, and the proportion of blue light generated by the excitation of the LED chip by the blue quantum dot 125 ranges from 5% to 10%. This ensures that the proportions of various colors of light in the solar-like light are close to the proportions of various colors of light in the solar spectrum, allowing the photoluminescent film 11 to produce solar-like light with spectral characteristics close to the solar spectrum when excited by light.

[0056] Furthermore, the color temperature of sunlight-like light is related to the mass ratio between quantum dots of various colors and all types of quantum dots. Therefore, the above scheme can enable the photoluminescent film 11 to generate sunlight-like light with a specific color temperature when excited by light.

[0057] In one implementation, please refer to Figure 4The first depth region 12A also includes multiple orange quantum dots 126; and / or, the third depth region 12C also includes multiple purple quantum dots 127.

[0058] In the above scheme, since the excitation wavelength of the orange quantum dot 126 is close to that of the red quantum dot 121, by setting the first depth region 12A to include multiple orange quantum dots 126, the multiple orange quantum dots 126 can be uniformly distributed in the bottom region of the photoluminescent film 11, so that the multiple orange quantum dots 126 and the multiple red quantum dots 121 are located in the same depth region. Furthermore, since the excitation wavelength of the purple quantum dot 127 is close to that of the blue quantum dot 125, by setting the third depth region 12C to also include multiple purple quantum dots 127, the multiple purple quantum dots 127 can be uniformly distributed in the top region of the photoluminescent film 11, so that the multiple purple quantum dots 127 and the multiple blue quantum dots 125 are located in the same depth region.

[0059] Furthermore, when the first depth region 12A also includes orange quantum dots 126, the photoluminescent film 11 can generate six colors of light—red, orange, yellow, green, cyan, and blue—under the excitation of the LED chip. The wavelengths of these six colors of light are continuous within the visible light wavelength range. Moreover, these six colors of light can not only be mixed to form white light, but their color types are also closer to the color types of light that make up visible light. Thus, the spectral characteristics of the white light can be made closer to the spectral characteristics of sunlight.

[0060] When the third depth region 12C also includes purple quantum dots 127, the photoluminescent film 11 can generate six colors of light—red, yellow, green, cyan, blue, and purple—under the excitation of the LED chip. The wavelengths of these six colors of light are relatively continuous within the visible light wavelength range. These six colors of light can not only be mixed to form white light, but their color types are also closer to the color types of light that make up visible light. In this way, the spectral characteristics of the white light can be closer to the spectral characteristics of sunlight.

[0061] When the first depth region 12A includes multiple orange quantum dots 126 and the third depth region 12C includes multiple purple quantum dots 127, the photoluminescent film 11 can generate red, orange, yellow, green, cyan, blue, and purple light under the excitation of the LED chip, a total of seven colors of light. The wavelengths of these seven colors of light are continuous in the visible light wavelength range. In addition, these seven colors of light can not only be mixed to form white light, but also have the same color types as the colors of the light that make up the visible light. In this way, the spectral characteristics of the white light can be closer to the spectral characteristics of sunlight.

[0062] In one implementation, please refer to Figure 4 In the case where the first depth region 12A also includes orange quantum dots 126 and the third depth region 12C includes multiple purple quantum dots 127, the mass ratio between red quantum dots 121 and all types of quantum dots 12 ranges from 20% to 25% (including endpoint values), the mass ratio between yellow quantum dots 122 and all types of quantum dots ranges from 12% to 15% (including endpoint values), the mass ratio between green quantum dots 123 and all types of quantum dots ranges from 25% to 30% (including endpoint values), the mass ratio between cyan quantum dots 124 and all types of quantum dots ranges from 5% to 10% (including endpoint values), the mass ratio between blue quantum dots 125 and all types of quantum dots ranges from 15% to 20% (including endpoint values), the mass ratio between orange quantum dots 126 and all types of quantum dots ranges from 10% to 15% (including endpoint values), and the mass ratio between purple quantum dots 127 and all types of quantum dots ranges from 5% to 10% (including endpoint values).

[0063] For example, the mass ratio between red quantum dot 121 and all types of quantum dots can be any value of 20%, 22%, or 25%; the mass ratio between yellow quantum dot 122 and all types of quantum dots can be any value of 12%, 13%, or 15%; the mass ratio between green quantum dot 123 and all types of quantum dots can be any value of 25%, 27%, or 30%; the mass ratio between cyan quantum dot 124 and all types of quantum dots can be any value of 5%, 8%, or 10%; the mass ratio between blue quantum dot 125 and all types of quantum dots can be any value of 15%, 17%, or 20%; the mass ratio between orange quantum dot 126 and all types of quantum dots can be any value of 10%, 12%, or 15%; and the mass ratio between purple quantum dot 127 and all types of quantum dots can be any value of 5%, 7%, or 10%.

[0064] It should be noted that the mass ratio between the various colors of quantum dots and all types of quantum dots can be selected and adjusted according to actual needs. This application embodiment does not limit the mass ratio between the various colors of quantum dots and all types of quantum dots, as long as the mass ratio between the various colors of quantum dots and all types of quantum dots is within its respective mass ratio range.

[0065] The above scheme, by setting the mass ratio range between red quantum dot 121 and all types of quantum dots to be 20%–25%, yellow quantum dot 122 to 12%–15%, green quantum dot 123 to 25%–30%, cyan quantum dot 124 to 5%–10%, blue quantum dot 125 to 15%–20%, orange quantum dot 126 to 10%–15%, and violet quantum dot 127 to 5%–10%, allows the red light generated by red quantum dot 121 under the excitation of the LED chip to appear in sunlight-like light. The proportion of yellow quantum dot 122 in sunlight-like light is 20%–25%, the proportion of yellow light generated by LED chip excitation in sunlight-like light is 12%–15%, the proportion of green light generated by LED chip excitation in sunlight-like light is 25%–30%, the proportion of cyan light generated by LED chip excitation in sunlight-like light is 5%–10%, the proportion of blue light generated by LED chip excitation in sunlight-like light is 15%–20%, the proportion of orange light generated by LED chip excitation in sunlight-like light is 10%–15%, and the proportion of purple light generated by LED chip excitation in sunlight-like light is 5%–10%. In this way, it can be ensured that the proportion of various colors of light in the solar-like light is closer to the proportion of various colors of light in the solar spectrum, so that the photoluminescent film 11 produces solar-like light with spectral characteristics that are closer to the solar spectrum when excited by light.

[0066] Furthermore, the color temperature of sunlight-like light is related to the mass ratio between quantum dots of various colors and all types of quantum dots. Therefore, the above scheme can enable the photoluminescent film 11 to generate sunlight-like light with a specific color temperature when excited by light.

[0067] In one implementation, such as Figure 1 As shown, the photoluminescent film 11 also includes a fully cured transparent adhesive layer 111 and a semi-cured transparent adhesive layer 112. The fully cured transparent adhesive layer 111 surrounds the upper surface and side surface of the photoluminescent film 11, and the semi-cured transparent adhesive layer 112 is disposed on the lower surface of the photoluminescent film 11.

[0068] The fully cured transparent adhesive layer 111 surrounding the upper and side surfaces of the photoluminescent film 11 can completely cover the upper surface and four side surfaces of the photoluminescent film 11. Furthermore, the lower surface of the fully cured transparent adhesive layer 111 can be flush with the lower surface of the photoluminescent film 11. The semi-cured transparent adhesive layer 112 disposed on the lower surface of the photoluminescent film 11 can at least completely cover the lower surface of the photoluminescent film 11. Preferably, the semi-cured transparent adhesive layer 112 not only completely covers the lower surface of the photoluminescent film 11, but also completely covers the lower surface of the fully cured transparent adhesive layer 111.

[0069] The above solution protects the upper and side surfaces of the photoluminescent film 11 by enclosing a fully cured transparent adhesive layer 111 on the upper and side surfaces, preventing substances such as water vapor and oxygen from penetrating into the interior of the photoluminescent film 11 and eroding the surface of the quantum dot layer 12. This helps to extend the service life of the photoluminescent film 11 and improve its reliability.

[0070] Furthermore, by providing a semi-cured transparent adhesive layer 112 on the lower surface of the photoluminescent film 11, on the one hand, the semi-cured transparent adhesive layer 112 can protect the lower surface of the photoluminescent film 11, preventing substances such as water vapor and oxygen from penetrating into the interior of the photoluminescent film 11 and eroding the surface of the quantum dot layer 12, thereby extending the service life of the photoluminescent film 11 and improving its reliability; on the other hand, since the semi-cured transparent adhesive layer 112 has adhesive strength, the photoluminescent film 11 can be directly bonded to the light-emitting surface of the LED chip 13 using the semi-cured transparent adhesive layer 112. This eliminates the need to apply adhesive to the lower surface of the photoluminescent film 11 or the light-emitting surface of the LED chip 13 during the bonding process, which simplifies the bonding process.

[0071] Figure 5 The diagram shown is a cross-sectional view of an LED bead according to another embodiment of this application. Figure 5 As shown, a semi-cured transparent adhesive layer 112 can be provided on the lower surface of the photoluminescent film 11, and the fully cured transparent adhesive layer 111 is omitted. Therefore, the photoluminescent film 11 and the light-emitting surface of the LED chip 13 can be directly bonded through the semi-cured transparent adhesive layer 112.

[0072] In some embodiments, a fully cured transparent adhesive layer 111 is formed on the upper surface and side surface of the photoluminescent film 11, and the semi-cured transparent adhesive layer 112 is omitted.

[0073] In some embodiments, both the fully cured transparent adhesive layer 111 and the semi-cured transparent adhesive layer 112 may be omitted.

[0074] This application also provides an LED light source, which includes LED beads according to any of the above embodiments. Because the LED light source is equipped with LED beads according to any of the above embodiments, it can produce sunlight-like light, which is beneficial for improving the color rendering performance of the LED light source.

[0075] For example, the LED light source can serve as a light source for a display device, including but not limited to displays, mobile phones, televisions, billboards, digital photo frames, digital cameras, camcorders, navigators, and other products with display functions. The LED light source can also serve as a light source for a lighting device, including but not limited to indoor lighting devices, outdoor lighting devices, automotive lighting devices, and other products with lighting functions. Indoor lighting devices include chandeliers, wall lights, and ceiling lights; outdoor lighting devices include streetlights, courtyard lights, lawn lights, and plaza lights; and automotive lighting devices include turn signals, fog lights, side marker lights, headlights, and brake lights. It should be noted that the specific types of indoor lighting devices, outdoor lighting devices, and automotive lighting devices can be selected and adjusted according to actual needs, and this application embodiment does not limit their specific types.

[0076] It is understood that since the LED light source adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0077] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0078] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0080] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An LED lamp bead, characterized in that, include: LED chip (13); as well as, A photoluminescent film (11) is located on the LED chip (13). The photoluminescent film (11) has at least a quantum dot layer (12), which contains at least red quantum dots, yellow quantum dots, green quantum dots, cyan quantum dots and blue quantum dots.

2. The LED lamp bead according to claim 1, characterized in that, The quantum dot layer (12) also contains at least one of orange quantum dots and purple quantum dots.

3. The LED lamp bead according to claim 1, characterized in that, The quantum dot layer (12) also contains at least one of infrared quantum dots and ultraviolet quantum dots; and / or, the quantum dots in the quantum dot layer (12) are all spherical and the particle size range of the quantum dots is 2nm to 20nm.

4. The LED lamp bead according to any one of claims 1 to 3, characterized in that, The quantum dot layer (12) has at least two depth regions, each depth region being located at a different depth of the quantum dot layer (12), and each depth region having quantum dots of at least one color. In two adjacent depth regions, the quantum dots in the depth region closer to the LED chip (13) have a longer excitation wavelength.

5. The LED lamp bead according to claim 4, characterized in that, The depth region includes a first depth region (12A), a second depth region (12B), and a third depth region (12C) arranged sequentially from bottom to top. The first depth region (12A) contains at least red quantum dots (121) and yellow quantum dots (122), the second depth region (12B) contains at least green quantum dots (123) and cyan quantum dots (124), and the third depth region (12C) contains at least blue quantum dots (125).

6. The LED lamp bead according to claim 5, characterized in that, The first depth region (12A) also contains orange quantum dots (126); and / or, the third depth region (12C) also contains purple quantum dots (127).

7. The LED lamp bead according to claim 1, characterized in that, The photoluminescent film (11) further includes a fully cured transparent adhesive layer (111) and / or a semi-cured transparent adhesive layer (112). The fully cured transparent adhesive layer (111) surrounds the upper surface and side surface of the quantum dot layer (12), and the semi-cured transparent adhesive layer (112) is disposed on the lower surface of the quantum dot layer (12).

8. The LED lamp bead according to claim 1 or 7, characterized in that, The thickness (T) of the photoluminescent film (11) is 80μm to 200μm; and / or, the LED chip (13) is a blue LED chip or a purple LED chip.

9. The LED lamp bead according to claim 8, characterized in that, The blue LED chip emits blue light with a wavelength having at least one peak, and the violet LED chip emits violet light with a wavelength having at least one peak.

10. An LED light source, characterized in that, Includes the LED lamp beads according to any one of claims 1 to 9.

Images