High-color-gamut light-emitting semiconductor device for backlight and preparation method thereof

Abstract

The invention belongs to the technical field of LEDs, solves the technical problem that a backlight source in the prior art usually adopts a white light LED and cannot meet the requirement of high color gamut, and provides a high color gamut light-emitting semiconductor device for backlight and a preparation method of the high color gamut light-emitting semiconductor device for backlight, the high color gamut light-emitting semiconductor device for backlight comprises an LED blue light chip and fluorescent powder; the fluorescent powder comprises green fluorescent powder and red fluorescent powder, the peak wavelength of the green fluorescent powder is located in a first wavelength interval, the peak wavelength of the red fluorescent powder is located in a second wavelength interval, the first wavelength interval is 525-545 nm, and the second wavelength interval is 625-635 nm; the dominant wavelength of the LED blue light chip is located in a third wavelength interval, and the third wavelength interval is 440-470 nm. By reasonably selecting the wavelength ranges of the blue light chip, the green fluorescent powder and the red fluorescent powder, the color gamut coverage rate of the light-emitting semiconductor device can be greatly improved, and an ideal backlight source is provided for high-color-gamut display application.

Description

Technical Field

[0001] The present invention relates to the field of LEDs, and in particular to a high color gamut light-emitting semiconductor device for backlighting and a preparation method thereof. Background Art

[0002] With the continuous development of display technology, consumers have higher and higher requirements for the display quality of electronic devices such as monitors, TVs, and smart phones, especially in terms of color performance. They hope to achieve a higher color gamut coverage to achieve a more realistic and rich picture effect. Therefore, high color gamut display technology has become a research and development hotspot in the display industry. In the backlight display system, the color gamut performance of the backlight source plays a decisive role in the color performance of the entire display. Therefore, the development of light-emitting semiconductor devices for backlighting with high color gamut performance has become a research focus in the industry.

[0003] Traditional backlight sources usually use white light LEDs, usually blue light chips excite yellow phosphors or blue light chips are combined with red and green phosphors to produce white light. However, the spectrum bandwidth emitted by traditional yellow phosphors is too wide to meet the requirements of high color gamut. In addition, the red phosphor has a low luminous efficiency, which often leads to poor red performance and makes it difficult to meet the requirements of high color gamut display. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a high color gamut light-emitting semiconductor device for backlight and a preparation method thereof, so as to solve the technical problem that the prior art backlight source usually adopts white light LED and cannot meet the requirements of high color gamut.

[0005] In a first aspect, an embodiment of the present invention provides a high color gamut light-emitting semiconductor device for backlight, comprising: LED blue light chip; Phosphor; The phosphor comprises a green phosphor and a red phosphor, wherein the peak wavelength of the green phosphor is within a first wavelength range, and the peak wavelength of the red phosphor is within a second wavelength range, wherein the first wavelength range is 525-545 nm, and the second wavelength range is 625-635 nm; The main wavelength of the LED blue light chip is in the third wavelength range, and the third wavelength range is 440-470nm.

[0006] In a second aspect, an embodiment of the present invention further provides a method for preparing a high color gamut light-emitting semiconductor device for backlighting, which is used for the high color gamut light-emitting semiconductor device for backlighting as described in any one of the first aspects, and the preparation method comprises: Processing the EMC red copper substrate to obtain a target substrate, wherein the target substrate includes a 0.2 mm red copper layer and a 100 μm additional copper layer; Placing the LED blue light chip in a round cup packaging structure, and fixing the LED blue light chip on the target substrate; Weighing the red phosphor and the green phosphor according to a first preset ratio, and uniformly mixing them to obtain a mixed phosphor; Slowly add the mixed phosphor into the AB curing encapsulation glue and continue stirring to ensure that the phosphor is evenly distributed in the colloid to obtain a mixed colloid; The mixed colloid is coated on the surface of the LED blue light chip, and is cured under preset temperature and humidity conditions, and a target light-emitting semiconductor device is obtained after a preset time.

[0007] In summary, the beneficial effects of the present invention are as follows: The high color gamut light-emitting semiconductor device for backlight and the preparation method thereof provided in the embodiment of the present invention can achieve maximum coverage of the color gamut by selecting a blue light chip with a wavelength range of 440-470 nm, controlling the peak wavelength of the green phosphor to 525-545 nm, and the peak wavelength of the red phosphor to 625-635 nm. This spectral distribution can effectively enhance the purity of the three primary colors of red, green and blue, so that the display device has a wider color gamut range, thereby significantly improving the color reproduction and realism. Due to the selection of a combination of efficient blue light LED chips and high quantum yield phosphors, the overall luminous efficiency is improved and the energy loss is reduced. At the same time, due to the high light conversion efficiency of the phosphor, the power consumption is effectively controlled under the premise of providing sufficient brightness, which helps to save energy. By strictly controlling the wavelength range of the phosphor, the light output of each wavelength region is more stable and uniform. This can effectively reduce the color deviation problem, so that the image can maintain consistent color performance at different angles and brightness, and enhance the uniformity and consistency of the image. In summary, this invention improves the color gamut coverage of light-emitting semiconductor devices while taking into account high brightness, low power consumption and consistent color performance by precisely controlling the wavelength distribution of chips and phosphors. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0009] Figure 1 This is an emission spectrum diagram of the green phosphor according to an embodiment of the present invention.

[0010] Figure 2 This is a particle size distribution diagram of the green phosphor according to an embodiment of the present invention.

[0011] Figure 3 The excitation and emission spectra of the red phosphor according to the embodiment of the present invention are shown in FIG.

[0012] Figure 4 This is a color gamut target diagram of a high color gamut light-emitting semiconductor device for backlighting in an embodiment of the present invention.

[0013] Figure 5a For the embodiment of the present invention Figure 4 A chromaticity coordinate table corresponding to the color gamut target diagram.

[0014] Figure 5b For the embodiment of the present invention Figure 4 Another chromaticity coordinate table corresponding to the color gamut target diagram.

[0015] Figure 5c For the embodiment of the present invention Figure 4 Another chromaticity coordinate table corresponding to the color gamut target diagram. DETAILED DESCRIPTION

[0016] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0017] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0018] Implementation Method 1

[0019] An embodiment of the present invention provides a high color gamut light-emitting semiconductor device for backlighting, comprising: LED blue light chip; Phosphor; The phosphor comprises a green phosphor and a red phosphor, wherein the peak wavelength of the green phosphor is within a first wavelength range, and the peak wavelength of the red phosphor is within a second wavelength range, wherein the first wavelength range is 525-545 nm, and the second wavelength range is 625-635 nm; The main wavelength of the LED blue light chip is in the third wavelength range, and the third wavelength range is 440-470nm.

[0020] Specifically, the main wavelength of the blue LED chip is in the third wavelength range between 440-470 nm. The blue light in this wavelength range can provide target excitation energy for green and red phosphors, making the phosphors emit light efficiently. At the same time, the blue light wavelength in this range is in the visually sensitive blue area, which helps to improve the color purity of blue and provide pure blue light output for the display system.

[0021] In this device, the phosphors are divided into green phosphors and red phosphors, which are used to emit green and red light respectively. This red and green phosphor combination, after being excited by the blue light chip, can emit a spectral distribution that conforms to the RGB color gamut, thereby expanding the color gamut coverage. Compared with the yellow phosphor combination of traditional white light LEDs, this red and green phosphor can provide more accurate and higher purity green and red light, making the backlight source more suitable for high color gamut display requirements.

[0022] The peak wavelength of green phosphor is limited to the range of 525-545 nm, which can ensure that the green part of the light-emitting device can cover a more precise green area. This wavelength range is usually in the green region of visible light (roughly 520-570nm), which can effectively enhance the color saturation and color gamut performance of light-emitting semiconductor devices, especially in display technology. Green light is one of the three primary colors of RGB (red, green, and blue). Controlling the wavelength of green phosphor can improve the color accuracy of the device and make the color presentation more realistic and rich. In LED devices with blue light (usually peaking at 450-470 nm) as the excitation source, the wavelength range of green phosphor (525-545 nm) can effectively absorb blue light and convert it into green light. By limiting the peak wavelength of green phosphor to this range, it is ensured that the generation of green light has good efficiency and spectral matching under blue light excitation. This matching is crucial to improving the light output efficiency of LED devices.

[0023] The peak wavelength of the red phosphor is set in the second wavelength range of 625-635 nm. The red light wavelength in this range belongs to the sensitive area of ​​visual red light and can provide high-purity red light output. When combined with green phosphor and blue light chip, it can achieve a wider color gamut coverage in the CIE chromaticity diagram, especially better performance in the red area. This specific wavelength of red phosphor has a high luminous efficiency under blue light excitation, which can significantly enhance the red performance of the display and improve the overall image realism and color saturation.

[0024] The main wavelength of the blue light chip is selected in the third wavelength range of 440-470 nm. This wavelength range not only meets the human eye's perception of blue, but also can efficiently excite red and green phosphors. The blue light wavelength in this range usually has a higher luminous efficiency, which makes the conversion efficiency of the phosphor higher, and can achieve stronger blue light output and effectively convert it into red and green light, thereby improving the overall brightness and color performance. The selection of blue light wavelength can also further reduce the dependence on other optical components, simplify system design, and control costs.

[0025] Preferably, the first wavelength range is 533-537 nm, and the second wavelength range is 630-634 nm.

[0026] See also Figure 1-Figure 3 The peak wavelength of the green phosphor is set at 533-537 nm and the peak wavelength of the red phosphor is set at 630-634 nm in order to further optimize the color gamut coverage and color purity of the backlight source. Specifically, this choice is based on the following considerations: The wavelength range of green light is in the area where the human eye is most sensitive to green (about 510-570 nm). Setting the peak wavelength of green phosphor in the narrow range of 533-537 nm can ensure that the green light emitted by the phosphor has a very high purity, which not only helps to improve the performance of the display in the green area, but also avoids the color components in the spectrum, ensuring that the colors are more vivid and accurate.

[0027] Green light with a wavelength of 533-537 nm can work well with blue excitation light (440-470 nm) to ensure high quantum efficiency (i.e., phosphor conversion efficiency). Therefore, this setting helps to increase the brightness output of green light and enhance the brightness performance of the green area of ​​the display. Green phosphors selected in this wavelength range can more accurately simulate green light in the natural environment, enhance the natural sense of vision, and make the colors of the image more realistic and vivid.

[0028] The wavelength of red light is visually about 620-650 nm, and the wavelength range of 630-634 nm is exactly in the sensitive range of visual red light, which can ensure that the red light has high purity and high saturation. The red light emitted by red phosphor in this wavelength range is closer to the natural perception of red by the human eye, greatly improving the red performance of the display system.

[0029] The color gamut range and color saturation of red light are important factors in color gamut expansion. By optimizing the peak wavelength of red phosphor to 630-634 nm, the color purity of the red part can be effectively improved, thereby expanding the color gamut of the overall display system, especially in the red area, so that the display device can cover a wider range of colors and enhance the layering and realism of the display.

[0030] The peak wavelength of red phosphor is in the narrow range of 630-634 nm, which can be more coordinated with the spectrum between blue light (440-470nm) and green light (533-537nm), making the overall color distribution of the display more balanced and full, avoiding color shift or distortion caused by traditional yellow light (such as the yellow light in the phosphor combination).

[0031] The wavelengths of green and red phosphors are set in this preferred range to maximize the color accuracy of the display, especially the color performance in the green and red areas. This is especially important for high color gamut displays (such as displays with the DCI-P3 color gamut standard) because it can provide richer and more accurate colors. When a blue light chip with a main blue light wavelength of 440-470 nm is selected, higher conversion efficiency can be obtained by exciting these two precise wavelengths of phosphors (green and red), reducing energy loss and improving overall brightness performance. The matching of blue light with these phosphors also helps to simplify the optical system design and improve luminous efficiency.

[0032] In summary, the optimized green phosphor wavelength is 533-537 nm and the red phosphor wavelength is 630-634 nm, which further accurately controls the wavelength of the color light output, ensures higher color purity and wider color gamut coverage, and significantly improves the color performance and visual quality of the display system.

[0033] Preferably, the particle size of the green phosphor is between 11.0 and 19.0 μm, and the particle size of the red phosphor is between 22.0 and 28.0 μm.

[0034] like Figure 2The figure shows the particle size distribution of green phosphor, which describes the distribution of particles in the range of 5.1 microns to 23.6 microns. The bar graph in the figure shows the proportion of particles of different particle sizes in the total sample. The curve shows that as the particle size increases, the particle passing rate gradually increases and eventually tends to 100%. This means that most particles can pass through the sieve with a larger aperture.

[0035] Specifically, the selection of phosphor particle size directly affects its optical properties, especially its response efficiency to blue light chip excitation, luminous brightness and color purity. Too small a particle size may lead to insufficient excitation efficiency of the phosphor and low luminous efficiency; while too large a particle size may affect the scattering of light, resulting in the inability of light to effectively propagate to the entire display area, thereby affecting the uniformity of light output. A green phosphor particle size between 11.0 and 19.0 µm helps it match the target with the blue light excitation wavelength and ensures a high excitation efficiency. Green phosphors within this particle size range can better absorb the excitation light from the blue light chip and effectively convert it into green light. Too small a particle size may lead to insufficient light emission efficiency, while too large a particle size may make the phosphor particles too coarse, reducing the conversion efficiency and uniformity of luminescence. This particle size range can achieve an ideal light scattering effect, ensure uniform distribution of light, and avoid the occurrence of "hot spots" or local uneven brightness. Through reasonable particle size design, the aggregation of phosphor particles can be effectively avoided, thereby ensuring the brightness consistency and color uniformity of the display screen.

[0036] The emission efficiency of red light is greatly affected by the particle size. A moderate particle size can optimize the excitation and emission characteristics of red phosphor. The particle size range of 22.0~28.0 µm can ensure that the red phosphor absorbs blue light efficiently and can effectively convert it into red light with higher purity, while avoiding the problem of decreased luminous efficiency caused by excessive particle size. The large particle size of red phosphor is mainly to optimize the scattering characteristics of red light. Larger particles help improve the directionality and brightness output of red light, thereby enhancing the performance of the red part in the display device. Too small particles may cause the emission of red light to be unfocused, affecting the purity of color and display effect. The emission of red light requires high-purity wavelength output. A moderate particle size helps avoid the broadening of the red spectrum, ensures its emission characteristics within the narrow band of 630-634 nm, and improves the color saturation and accuracy of the red area in the display.

[0037] High-purity output of green and red light is essential for color gamut expansion. Appropriate particle size design can ensure that green and red phosphors produce efficient and uniform light emission under the excitation of blue light, thereby achieving good matching and color coverage of the RGB color gamut. Selecting a green phosphor particle size of 11.0~19.0 µm and a red phosphor particle size of 22.0~28.0 µm helps ensure the stability of the phosphor manufacturing process and ensures that the particle size consistency can be maintained during the actual production process. Phosphors with smaller or larger particle sizes may cause uneven particle distribution, affecting the uniformity and consistency of the final display effect. The combination of green phosphor particle size set at 11.0~19.0 µm and red phosphor particle size set at 22.0~28.0 µm helps to ensure the color purity, brightness uniformity and optical efficiency of the display while expanding the color gamut. The design of this particle size range fully considers the luminous efficiency, brightness uniformity, color performance and the feasibility of the production process, which can effectively improve the performance of the display, especially for high-end display applications that require accurate color and high brightness output.

[0038] In summary, the selection of these particle size ranges can optimize luminous efficiency, enhance light uniformity, and improve the overall performance of the display effect, especially in terms of color accuracy and brightness, ensuring the high color gamut and high brightness output of the backlight source to meet high-end display requirements.

[0039] Preferably, the CIE color coordinates of the green phosphor are between (0.273, 0.679) and (0.283, 0.690), and the CIE color coordinates of the red phosphor are between (0.690, 0.304) and (0.696, 0.310).

[0040] Specifically, CIE color coordinates are a standard method commonly used in color science to describe the position of a color in a chromaticity diagram. The more accurate the color coordinates, the higher the purity and color accuracy of the color represented. Selecting these specific ranges of CIE color coordinates ensures that the color output of the phosphor has high purity and high color accuracy, thereby improving the color performance of the display system.

[0041] The CIE color coordinates of green phosphors range from (0.273, 0.679) to (0.283, 0.690), which is in the green region of the CIE chromaticity diagram, meaning that the green phosphors can output pure green light under blue light excitation, and are close to the natural perception of green by the human eye. Green light wavelengths in this range can provide a vivid, natural green effect visually, enhance the color performance of the green region, and make the green in the display appear higher in purity and saturation.

[0042] The CIE color coordinate range of red phosphor is (0.690, 0.304) ~ (0.696, 0.310), which is located in the red area of ​​the CIE chromaticity diagram and can provide very high purity red light. The selection of red phosphor in this range can ensure that the red light output after excitation has high saturation and color accuracy, and is very close to the visual perception of standard red light. This can enhance the performance of the red area in the display system, make the image more vivid and realistic, and improve the overall color saturation. The precise setting of the CIE color coordinates of green and red phosphors helps to expand the color gamut of the entire display system, especially in the green and red parts. This is of vital importance for modern display technology, especially for displays that require a high color gamut (such as DCI-P3, Adobe RGB and other standards). Through precise CIE color coordinate control, the color accuracy, color saturation and visual impact of the display can be significantly improved. The precise color coordinates of green and red light not only help to expand the color gamut, but also ensure the balance between different colors. For example, red or green that is too bluish will affect the entire display effect, while accurate CIE color coordinate settings ensure the target coordination of the three primary colors (RGB) in the chromaticity diagram, allowing the entire display system to display richer and more balanced colors. Accurate CIE color coordinates can not only improve the color purity of green and red light, but also promote the expansion of the color gamut of the entire display system and the balanced distribution of colors, thereby enhancing the display effect. Especially in the display field with rich colors and high precision requirements, such as professional displays, TVs, computer monitors, etc., the optimization of CIE color coordinates of green and red phosphors significantly improves the overall color performance and image realism.

[0043] Preferably, the green phosphor is nitrogen oxide, and the red phosphor is fluoride.

[0044] Specifically, oxynitride green phosphors (such as SiAlON, CaAl2O4N2) generally have higher luminous efficiency and stronger stability.

[0045] This is because oxynitride materials can maintain good chemical stability under high temperatures or other extreme conditions, avoiding performance degradation due to thermal attenuation or oxidation during long-term use. Oxynitride phosphors generally have higher quantum efficiency, that is, higher energy conversion efficiency. They can more efficiently convert blue light into green light, which helps to improve display brightness and color performance, especially in high-brightness display devices. The spectral output of oxynitride green phosphors is more concentrated, which can provide higher purity green light and avoid color mixing caused by excessive spectral width, thereby improving the color purity of the green area and making the display more accurate. In some cases, oxynitride materials are more environmentally friendly than traditional rare earth elements (such as lanthanides), with lower toxicity and environmental impact, so they are increasingly favored in the application of green phosphors.

[0046] Fluoride red phosphors (such as yttrium fluoride, aluminum fluoride, K2SiF6:Mn 4+ Fluoride phosphors (such as fluoride phosphors) usually have very high luminous efficiency and can effectively convert blue light excitation into red light of higher purity. The red spectrum of fluoride materials is more concentrated and has high saturation, which helps to improve the performance of the red area of ​​​​the display device, making the display effect more vivid and accurate. Fluoride phosphors usually have better thermal stability at higher temperatures than other types of phosphors. This makes them less susceptible to temperature in long-term, high-brightness use environments, maintain high luminous efficiency and low decay rate, and improve the long-term stability of the display system.

[0047] The combination of nitrogen oxide green phosphor and fluoride red phosphor can achieve the target light efficiency and color purity. Nitrogen oxide green phosphor provides high brightness and high purity green light, while fluoride red phosphor provides high efficiency and high saturation red light. The combination of the two enables the display system to achieve a wide range of color gamut coverage, especially the expansion of the green and red areas, which enhances the color performance of the entire display system. The high quantum efficiency of nitrogen oxide green phosphor and the high light efficiency of fluoride red phosphor work together to achieve an optimized balance between brightness and color saturation in the display system to meet the needs of high color gamut display. The high thermal stability and high chemical stability of nitrogen oxide green phosphor and fluoride red phosphor enable the backlight source to maintain stable performance under high brightness and long-term use conditions, reduce attenuation and color deviation, and thus improve the service life and reliability of the display.

[0048] Preferably, AB curing packaging glue is also included.

[0049] Specifically, AB curing encapsulant, usually composed of two components (component A and component B), is cured after mixing, has excellent physical and chemical properties, and is widely used in the field of optoelectronic packaging. The following are its specific advantages and functions: One of the main functions of AB curing encapsulant is to protect internal optoelectronic components (such as LED chips and phosphors). It can effectively isolate the impact of external environmental factors (such as moisture, dust, temperature, etc.) on the chip, prevent oxidation, corrosion or damage, and improve the long-term stability and reliability of the package. After curing, the encapsulant forms a hard physical structure, which enhances the mechanical strength and shock resistance of the LED backlight source. This helps to maintain the integrity of the package under conditions of high temperature, high humidity, and long-term use, and avoids package damage or cracking caused by physical shock or temperature changes. Through the use of encapsulant, the scattering and reflection loss of light can be effectively reduced, and the transmittance and transmission efficiency of light can be improved. The optical properties of the encapsulant (such as high transmittance and low refractive index) help to improve the brightness and color performance of the LED light source and avoid light attenuation caused by material mismatch.

[0050] AB-curing encapsulant generally has very high transparency, which can ensure that the light output of LED chips and phosphors is not hindered by the encapsulant material. This high transparency can ensure that blue light passes through the chip effectively, stimulating green and red phosphors to emit light, while reducing light loss and improving overall brightness and light efficiency. AB-curing encapsulant can optimize the propagation path of LED light by adjusting its refractive index, thereby reducing light reflection and scattering, ensuring the directionality of light, and improving the optical performance of the display. This is especially important for high-brightness, wide-color gamut backlight sources. By adding AB-curing encapsulant, the mechanical strength, thermal management capabilities and optical properties of the entire backlight source can be effectively improved. The high transparency, high temperature resistance, UV resistance and electrical insulation of the encapsulant enable the backlight source to improve brightness and color performance while enhancing durability and stability. This is of great significance for display devices with long-term, high-brightness display requirements, especially for applications such as high color gamut and HDR display.

[0051] Preferably, the mass percentage of the green phosphor is between 6.33% and 11.02%, the mass percentage of the red phosphor is between 21.98% and 37.97%, and the mass percentage of the AB curing encapsulation adhesive is between 55.70% and 69.07%.

[0052] Specifically, the mass percentage of green phosphor directly affects the output intensity and purity of green light in the display system. The ratio of green phosphor within this range can ensure that the excited blue light can fully excite the green phosphor, produce high-purity green light, and optimize the green area color performance of the display system. Too high a ratio of green phosphor may lead to excessive enhancement of green light and affect color balance, so a moderate ratio setting helps to coordinate with other colors (such as red) to avoid imbalance in the color gamut. The mass percentage of red phosphor affects the output intensity and purity of red light in the display system. This ratio setting is designed to ensure that the output of red light is sufficiently saturated and has high brightness, improving the color performance of the red area of ​​the display, especially in the high color gamut display requirements, the proportion of red light is crucial. A higher ratio of red phosphor helps to expand the color gamut in the red area of ​​the CIE chromaticity diagram, allowing the display system to present more vivid and pure red light. At the same time, an appropriate ratio can also avoid oversaturation of color and affect the overall color gamut balance. The mass ratio of AB-cured encapsulant in the backlight source is directly related to the stability, optical performance and thermal management effect of the package. A higher ratio of AB-cured encapsulant can ensure the integrity and durability of the encapsulation structure, while optimizing light transmittance, reducing light loss, and improving overall lighting efficiency.

[0053] Preferably, the mass percentage of the green phosphor is 6.33%, the mass percentage of the red phosphor is 37.97%, and the mass percentage of the AB curing encapsulation adhesive is 55.70%.

[0054] The lower mass percentage of green phosphor means that it contributes relatively little to green light. This helps maintain color balance and avoids over-enhancement of green, which would affect the harmony of the overall color gamut. 6.33% of green phosphor is enough to ensure that it provides appropriate green output in the RGB color gamut without oversaturating green, maintaining color accuracy and naturalness. This moderate ratio helps ensure that the green phosphor has a high quantum efficiency under blue light excitation without causing interference from other light colors.

[0055] The red phosphor ratio of 37.97% is relatively high, which can provide a strong enough red light output for the display system. Red is a very critical part in color gamut expansion, and a higher red phosphor ratio ensures that the display device can provide rich and saturated colors in the red area. This ratio helps to improve the color performance in the red area, making the display effect more vivid and realistic.

[0056] A higher red phosphor content helps expand the red region in the CIE chromaticity diagram, enhancing the color vividness and saturation of the display. The high proportion of AB-cured encapsulant indicates its importance in the overall design. Encapsulant protects the LED chip and phosphor from external environmental factors (such as moisture, dust, and heat) that affect their performance. This ratio ensures the stability of the encapsulation structure, provides strong mechanical protection, and effectively enhances optical performance.

[0057] In Comparative Example 1, green phosphor BS542G2 and red phosphor ZYPF631B produced by Yuji Company were used, and the formula ratio was 0.3067g of green phosphor, 0.8667g of red phosphor and 2.2000g of curing glue (BQ4239A / B).

[0058] In Comparative Example 2, green phosphor SDNG541ZS1 and red phosphor SDK300ZS2 produced by Shields Corporation were used, and the formula ratio was 0.2857 g of green phosphor, 0.8571 g of red phosphor and 2.2000 g of curing glue (BQ4239A / B).

[0059] In a pair of example 3, the embodiment uses green phosphor SDNG537S1 and red phosphor SDK305ZS1 produced by Shield Company, and the formula ratio is 0.3786g of green phosphor, 0.8571g of red phosphor and 2.2000g of curing glue (BQ4239A / B).

[0060] In a preferred embodiment, the embodiment uses green phosphor NBG535 and red phosphor KSL-610BH produced by Interma, and the formula ratio is 0.2500g of green phosphor, 1.5000g of red phosphor and 2.2000g of curing glue (BQ4239A / B). The light-emitting semiconductor prepared by this formula has the following properties: voltage of 3.270V, current of 184.73mA, luminous efficiency of 94.16lm / W, chromaticity coordinates of X=0.2727, Y=0.2565, color temperature of 15272K color gamut, and color gamut of 93.51%.

[0061] In Comparative Example 4, the embodiment uses green phosphor SAMPLE A4 and red phosphor GRX40, and the formula ratio is 0.2800 g of green phosphor, 0.8667 g of red phosphor and 2.2000 g of curing glue (BQ4239A / B).

[0062] In Comparative Example 5, the embodiment uses green phosphor G41D0320 and red phosphor ZYPF631B produced by Yuji Company, and the formula ratio is 0.2850g of green phosphor, 0.7000g of red phosphor and 2.2000g of curing glue (BQ4239A / B).

[0063] In Comparative Example 6, the embodiment uses green phosphor G41D0220 and red phosphor R31D0530 produced by Yuji Company, and the formula ratio is 0.2867g of green phosphor, 0.7600g of red phosphor and 2.2000g of curing glue (BQ4239A / B).

[0064] In Comparative Example 7, the embodiment uses green phosphor SDNG534DZ1 and red phosphor SDK305ZS1 produced by Shields Corporation, and the formula ratio is 0.3067 g of green phosphor, 0.8000 g of red phosphor and 2.2000 g of curing glue (BQ4239A / B).

[0065] In Comparative Example 8, the embodiment uses green phosphor SG-540 and red phosphor 680F-25110-A produced by Ruyouyan Co., Ltd., and the formula ratio is 0.2485g of green phosphor, 0.7879g of red phosphor and 2.2000g of curing glue (BQ4239A / B).

[0066] The light-emitting semiconductor is prepared through the above preferred examples and embodiments, and the parameters of the obtained finished products are summarized in Table 1.

[0067] Table 1 Summary of parameters of finished light-emitting semiconductor products

[0068] From the data in the table, it can be concluded that the preferred example has excellent performance in color gamut and luminous efficiency, and is suitable for applications with high color gamut. Although some comparative examples have higher luminous efficiency (such as comparative example 5), their color gamut performance is poor and cannot reach the expected color gamut range. Therefore, the preferred example has excellent performance in the balance of color gamut and color temperature, and is a more ideal choice.

[0069] Then, the light-emitting semiconductor of the preferred example is subjected to color gamut targeting to indicate the coverage of different color regions. Figure 4 The figure shown here helps us to visually see the distribution of various colors and shows the location of colors on the CIE 1931 chromaticity diagram. Each mark (such as EM13, EM12, etc.) represents a specific color area, which indicates the range of colors that can be presented on devices such as displays and light sources; like Figure 5a-5cAs shown in the figure, the two tables contain the chromaticity coordinate data in the color gamut area. The data of each color area are error-free chromaticity coordinates, upward, downward, left, and right errors from top to bottom. The error-free chromaticity coordinates are the standard position of each color gamut area on the chromaticity diagram. The upward, downward, left, and right errors represent the possible offset of the chromaticity coordinates in different directions. Figure 4-5c It can be found that the chromaticity coordinates of the preferred example are close to the ideal value, and the errors in the four directions are small, which means that the colors in these areas are relatively stable and suitable for devices with high precision requirements.

[0070] Implementation Method 2 The embodiment of the present invention further provides a method for preparing a high color gamut light-emitting semiconductor device for backlighting, which is used for the high color gamut light-emitting semiconductor device for backlighting described in any one of Embodiment 1, and the preparation method comprises: S1, processing the EMC red copper substrate to obtain a target substrate, wherein the target substrate includes a 0.2 mm red copper layer and a 100 μm additional copper layer; In this step, the EMC copper substrate is processed into a structure suitable for packaging. The substrate includes a 0.2 mm thick copper layer and a 100 micron thick additional copper layer. The copper layer has good thermal conductivity, which can effectively dissipate heat and help the LED chip maintain a stable temperature during operation; while the additional copper layer further enhances the thermal conductivity and provides a suitable surface for subsequent welding or gluing.

[0071] S2, placing the LED blue light chip in a round cup-shaped packaging structure, and fixing the LED blue light chip on the target substrate by conductive silver glue or welding; The LED blue light chip is placed in a round cup-shaped packaging structure. The round cup-shaped structure can gather light, making the LED light more concentrated. Then, the chip is fixed on the target substrate using conductive silver glue or welding. Conductive silver glue has excellent conductivity and can ensure the stable transmission of current. At the same time, it establishes a firm connection between the chip and the substrate to prevent the chip from shifting or loosening, ensuring the stability of the device.

[0072] S3, weighing the red phosphor and the green phosphor according to a first preset ratio, and uniformly mixing them to obtain a mixed phosphor; According to the design's luminous requirements, weigh the red phosphor and green phosphor in a preset ratio and mix them evenly. This step ensures that the phosphor combination can emit the expected red and green light under blue light excitation, thereby achieving high color gamut output. The preset ratio design can affect the final color performance and light effect, so precise weighing and mixing are required to ensure uniform distribution of the phosphor.

[0073] Preferably, the red phosphor and the green phosphor are weighed according to a first preset ratio, and are uniformly mixed to obtain a mixed phosphor, comprising: S31, dividing the particle size range of the red phosphor to obtain more than two first target particle size ranges; First, the particle size range of the red phosphor needs to be determined, which is done by measuring the size of the phosphor particles. The particle size division is determined by referring to a particle size distribution diagram or standard. The phosphor particle size is divided into several categories according to certain standards, and the appropriate particle size range is usually selected according to application requirements. In this step, the purpose is to ensure that the red phosphor particle size in the subsequent ratio can meet the requirements of the optical effect, while improving the uniformity and stability of the mixing process. Phosphors of different particle sizes contribute differently to the final luminous effect. Finer particles can usually improve color vividness, while larger particles may affect the light scattering characteristics.

[0074] By dividing the particle size, it can be ensured that the phosphors in each particle size range play different roles in the actual mixing, so as to optimize their performance. For example, phosphors with smaller particle sizes may have better optical absorption and luminescence characteristics, while phosphors with larger particle sizes may provide a wider color gamut contribution. The purpose of this step is to lay a good foundation for the subsequent mixing steps by optimizing the particle size range of the phosphors, thereby improving the color gamut effect of the final product.

[0075] S32, screening the red phosphor according to the first target particle size range to obtain target red phosphors belonging to different first target particle size ranges; The purpose of this step is to group the red phosphors according to the pre-defined particle size range through the screening process, so that the amount of red phosphors added in each particle size range can be accurately controlled in the subsequent mixing process. Screening is a commonly used physical separation method that can group red phosphors through sieves with different apertures. The uniform size of the phosphor particles after screening helps ensure that the phosphors of different components in the final mixture can better exert their optical properties, improve the dispersion of the phosphors, and reduce aggregation or precipitation between particles.

[0076] By screening the red phosphor, it is possible to ensure that red phosphors of different particle sizes are more evenly distributed in the colloid when mixed with green phosphors, thereby improving the overall luminous efficiency and chromaticity balance of the mixed phosphors. For each particle size range of red phosphors, its optical properties will be different. By controlling the proportion of phosphors in each particle size range, its contribution to the final optical effect can be optimized.

[0077] S33, dividing the target particle size range of the green phosphor to obtain more than two second target particle size ranges; Similar to red phosphor, the particle size range of green phosphor also needs to be divided. This is because green phosphors of different particle sizes will affect their optical efficiency, chromaticity performance and uniformity during mixing. Green phosphors with smaller particle sizes can be better mixed with colloids and other phosphors, thereby improving the uniformity of the color gamut, while green phosphors with larger particle sizes may affect the optical effect after mixing. Therefore, by dividing the particle size of green phosphor, its proportion in the final mixed phosphor can be more accurately controlled, thereby ensuring the optimization of the final optical performance.

[0078] The method of dividing the particle size range is the same as that of the red phosphor. According to different particle sizes, a suitable particle size range can be determined and sieved within this range. In this process, it is ensured that green phosphors of different particle size ranges can be effectively proportioned and form an ideal match with red phosphors in terms of optical properties. S34, sieve the red phosphor according to the second target particle size range to obtain target green phosphors belonging to different second target particle size ranges; In this step, the green phosphor will be screened into multiple particle size ranges, similar to the screening process of red phosphor. The purpose of this is to ensure that the green phosphor of each particle size range has a corresponding ratio with the red phosphor during the mixing process, thereby ensuring a uniform distribution of the color gamut. Through screening, the green phosphor with a moderate particle size is matched with the red phosphor of a different particle size range to improve its optical performance and avoid optical instability caused by too large or too small particle size.

[0079] In the subsequent mixing process, green phosphors of different particle size ranges will play their specific optical role in the colloid, ensuring that the final mixed phosphor has good luminous efficiency and chromaticity performance. S35, according to the difference between the first target particle size range and the second target particle size range, determine the correspondence between the red phosphor corresponding to the first target particle size range and the green phosphor corresponding to the second target particle size range; The purpose of this step is to ensure that the red and green phosphors with different particle size ranges are matched to optimize the mixing effect. Depending on the difference in particle size ranges, red and green phosphors may have different optical responses and scattering effects. For example, phosphors with larger particle sizes may cause higher scattering, affecting the propagation and efficiency of light; while phosphors with smaller particle sizes may show better luminous efficiency and uniformity. Therefore, ensuring that phosphors with large differences in particle size ranges are properly matched can minimize inconsistencies and color deviations, ensuring the luminous effect and color performance of the final product.

[0080] The degree of difference can be quantified in the following aspects: Particle size difference: First, compare the particle size range of the two phosphors to see if there is a significant deviation. For example, if the particle size range of the red phosphor is 10-20 microns, and the particle size range of the green phosphor is 5-10 microns, then the particle size difference between the two powders is large.

[0081] Particle size overlap: In some cases, the particle size ranges of red and green phosphors may overlap. For example, the particle size range of red phosphor is 10-20 microns, while the particle size range of green phosphor is 15-25 microns, with an overlap of 15-20 microns. This overlap can help determine the target match between them.

[0082] Particle distribution characteristics: Particle size differences may also affect the particle distribution characteristics of phosphors. If the particle size of a certain type of phosphor is too large, it may not be easy to disperse evenly with other powders during mixing, resulting in uneven distribution of phosphors and affecting the luminescence effect.

[0083] Based on the above information, the corresponding relationship can be determined in the following ways: When the particle size range of the red phosphor overlaps more with the particle size range of the green phosphor, their mixing effect is better. At this time, the difference in particle size between the red and green phosphors is small, the optical effect after mixing is stable, and the particles can be more evenly distributed. If the particle size range of the red phosphor is significantly different from the particle size range of the green phosphor, this may cause uneven dispersion of particles during mixing, affecting the final luminous effect. Therefore, combinations with too large a difference in particle size should be excluded. Even if the difference in particle size is small, if the particles are unevenly distributed, it may affect the mixing effect. Therefore, it is necessary to ensure that the selected phosphor has good uniformity in particle distribution to avoid reduced luminous efficiency due to poor dispersion.

[0084] Through this step, it is possible to scientifically match the particle size differences between the red and green phosphors and optimize their mixing process. In this way, not only can the negative impact of the particle size difference on the optical performance be reduced, but also the uniformity and stability of the mixing can be improved, thereby enhancing the luminous efficiency, color rendering index and optical uniformity of the final product. More importantly, this process provides a scientific basis for the mixing and blending of subsequent steps, ensuring that the proportion adjustment of each premixed phosphor can achieve a balance between color and luminous efficiency, and ultimately achieve high-quality backlight or display products. S36. According to the corresponding relationship and the first preset ratio, each of the target red phosphors and the corresponding target green phosphors are added to a stirring device for premixing to obtain a number of premixed phosphors; In this step, the determined particle size range correspondence and the first preset ratio will be applied to the mixing of red and green phosphors. The red phosphor of each target particle size range is matched with the corresponding green phosphor and put into the stirring device for pre-mixing. The purpose of this step is to ensure that the red and green phosphors can be evenly distributed during the mixing process to ensure the uniformity and optical performance of the final mixed phosphor. The stirring equipment needs to ensure uniform mixing to avoid uneven dispersion of particles.

[0085] By reasonably matching the particle size ranges of red and green phosphors, the luminous efficiency and color gamut of the premixed phosphors can be effectively optimized. This process helps to maximize the optical properties of each phosphor and improve the performance of the final light-emitting semiconductor device. S37, according to the second preset ratio, sequentially add the premixed phosphors to the stirring device and mix them evenly to obtain the mixed phosphor.

[0086] In this step, the premixed phosphors are finally mixed using a second preset ratio. By precisely controlling the ratio of each type of premixed phosphor, the optical contributions of different phosphors in the final mixture can be balanced. This ratio is usually determined based on experimental data, simulation tests, or target optical performance requirements, and can effectively improve the luminous efficiency and color gamut of the final light-emitting semiconductor device. The final mixed phosphor will be used to coat the LED blue light chip to ensure that it has the required optical properties.

[0087] The effectiveness of this step lies in that it not only adjusts the mixture of each phosphor in precise proportion so that the final mixture has good optical effects, but also ensures the stability and consistency of the final product.

[0088] In one embodiment, assuming that there are only two premixed phosphors, the second preset ratio can be 1:1, which means that the ratio of the two phosphors is equal. Specifically, during the mixing process, the two premixed phosphors will be added to the stirring device at a ratio of 1:1 for uniform mixing. By setting this ratio, it is intended to make the two phosphors evenly distributed in the final mixture, thereby ensuring the final optical performance balance, avoiding excessive dominance of either party, and thus improving the overall luminous efficiency and chromaticity balance.

[0089] When the number of premixed phosphors increases, for example, there are three premixed phosphors, the second preset ratio can be 1:1:1, which means that the ratio of the three premixed phosphors is equal. In this embodiment, the three premixed phosphors will be mixed in a ratio of 1:1:1. The equal ratio of each phosphor means that they will contribute equally to the final optical effect. This ratio helps to ensure that the influence of each phosphor in the final product is balanced, thereby avoiding the imbalance of the color gamut or the reduction of luminous efficiency due to the excessive use of a certain phosphor.

[0090] This setting is suitable for applications that require balancing the optical properties of each premixed phosphor. Specifically, in the preparation of high color gamut light-emitting semiconductor devices for backlight, the ratio of 1:1:1 helps to give full play to the advantages of each premixed phosphor, and can maintain a suitable ratio between multiple phosphors to optimize the final optical performance. Preferably, according to the second preset ratio, the premixed phosphors are added to the stirring device in sequence and mixed evenly to obtain the mixed phosphor, including: S371, performing optical property tests on each of the premixed phosphors according to preset excitation conditions to obtain a first test result, wherein the first test result at least includes luminous efficiency, chromaticity coordinates, and color rendering index; In step S371, the preset excitation conditions refer to the optical property test in a certain experimental environment. Such excitation conditions usually include specific temperature, humidity, wavelength of the excitation light source, light intensity, test time, etc. These conditions ensure that each premixed phosphor is tested under a consistent external environment to avoid performance changes caused by environmental fluctuations. During the test, the goal is to obtain the luminous efficiency, chromaticity coordinates and color rendering index of each premixed phosphor under actual application conditions. The luminous efficiency reflects the energy efficiency of the light source, the chromaticity coordinates determine the color of the light, and the color rendering index indicates the ability of the light source to restore the color of the object. In actual operation, a fluorescence spectrophotometer or a high-precision colorimeter is used to strictly test each premixed phosphor and record the relevant data. The test results provide a basis for the subsequent determination of the target premixed phosphor and its initial proportion.

[0091] S372, performing one-way ANOVA on each of the first test results to obtain a one-way ANOVA result; Step S372 uses a one-way analysis of variance method to process the optical test results obtained in S371. Analysis of variance is a common statistical method used to detect whether there are significant differences between different sample groups. The purpose of this step is to determine whether the performance differences between different premixed phosphors are large enough to affect the optical effect of the final product. If there are significant differences, it means that some premixed phosphors exhibit different performance under specific conditions, and these differences need to be further considered for optimization and adjustment during the proportioning. In the specific implementation process, statistical software such as SPSS or R language is used to perform analysis of variance. By calculating the variance between different phosphors, it is determined which ones have significant differences, thereby determining which premixed phosphors should be used as target premixed phosphors for subsequent proportioning optimization.

[0092] S373, judging whether there is a significant difference between the premixed phosphors according to the result of the one-way variance analysis; Step S373 determines whether there are significant differences based on the results of the one-way ANOVA in S372. If the analysis results show that there are significant differences in the optical properties between certain premixed phosphors, these differences are sufficient to affect the performance of the final product, and therefore these phosphors need to be marked as target premixed phosphors. For example, if the chromaticity coordinates of a certain premixed phosphor are significantly different from those of other phosphors, then this phosphor may need to be optimized in proportion or replaced. The key to this step is to determine which phosphors have sufficiently differentiated performance based on the statistical results of the variance analysis to be candidates for further blending. This judgment will provide a basis for the next step of determining the proportion and mixing strategy.

[0093] S374, if there is, taking the premixed phosphor with significant difference as the target premixed phosphor; In this step, the target phosphor is selected based on its differences and optimization potential in optical performance tests. For example, during the implementation process, the performance data of each premixed phosphor can be recorded to clearly select which phosphors to adjust the proportion and optimize the mixture.

[0094] S375, analyzing the first test result of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor; Step S375 analyzes the first test results of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor. The core purpose of this step is to determine the proportion range of each target premixed phosphor in the final mixed phosphor based on the performance of each target premixed phosphor, combined with experimental data, color gamut requirements, color rendering index and other parameters. This process usually involves a comprehensive evaluation of the optical performance, and by analyzing the luminous efficiency, chromaticity coordinates and color rendering index of each target phosphor, its contribution to the overall optical effect when mixed is evaluated. For example, if the luminous efficiency of a certain premixed phosphor is high, its proportion can be appropriately increased, otherwise it can be reduced. In specific implementation, the chromaticity diagram and luminous efficiency curve can be used to evaluate the optimization range of each premixed phosphor to ensure that the optical effect after mixing meets the product requirements.

[0095] S376, determining a first preset number of initial proportion combinations within the initial proportion range, wherein the first preset number is positively correlated with the number of the target premixed phosphors, and the initial proportion combination includes the proportion of each target premixed phosphor in the mixed phosphor; in different proportion combinations, the proportions of at least two target premixed phosphors are different; This step examines the effects of different ratios of each phosphor on the final optical effect by setting multiple initial ratio combinations. The purpose is to ensure that different ratio combinations can cover various possible configurations and find the optimal ratio scheme. During implementation, different ratio methods can be selected, such as gradually adjusting the ratio or using strategies such as algorithm optimization to ensure that the ratio combinations are diverse so that the target ratio scheme can be verified through experiments later. The beneficial effect of this step is that after experimentally verifying different combinations, the premixed phosphor combination with the least impact on optical performance and good effect can be locked in.

[0096] The first preset number is the number of proportion combinations designed when performing mixing optimization. The setting of the first preset number is positively correlated with the number of target premixed phosphors, which means that the more the number of target premixed phosphors, the more proportion combinations of the first preset number. This is because more target premixed phosphors require more proportion combinations for comprehensive testing and optimization. By increasing the number of proportion combinations, it is possible to ensure that more ratio combinations are tested and the best solution is selected. Generally speaking, the first preset number will be set to several times the number of target premixed phosphors to ensure that all possible ratios are fully explored.

[0097] At least two target premixed phosphors have different ratios in different ratio combinations, mainly to test the interaction of different phosphors in the mixture and their impact on the optical properties of the final product. If all premixed phosphors have the same ratio in each ratio combination, it is impossible to fully evaluate the performance of each phosphor.

[0098] S377, mixing the target premixed phosphors according to the proportion combinations to obtain the first preset quantity of initial mixed phosphors; The purpose of this step is to verify the effect of different ratios on the final optical performance. By using a stirring device, each premixed phosphor can be evenly distributed to avoid unstable optical effects caused by uneven dispersion. During implementation, the ratio is operated according to the set initial ratio, and the mixing process is precisely controlled to ensure that the composition of the mixed phosphor is consistent each time. The beneficial effect of this step is that by verifying different ratio combinations, the specific effect of each premixed phosphor on the optical effect after mixing can be accurately understood.

[0099] S378, performing an optical property test on each of the initial mixed phosphors according to the preset excitation conditions to obtain a second test result, wherein the second test result includes luminous efficiency, chromaticity coordinates, and color rendering index; The purpose of this stage is to verify the optical performance of the initial mixed phosphor through further test data. The test content includes luminous efficiency, chromaticity coordinates and color rendering index, etc., to ensure that the performance of each phosphor after mixing meets expectations. In actual operation, precision equipment such as fluorescence spectrophotometer and colorimeter can be used for measurement to ensure the accuracy of the data. Through this test, those ratio combinations with the best optical performance requirements can be further screened out.

[0100] S379, performing weighted calculation on the second test result according to a preset weight to obtain a first score for each initial mixed phosphor; Step S379 performs weighted calculation on the second test result according to the preset weights to obtain the first score of each initial mixed phosphor. The purpose of this process is to calculate the comprehensive score of each ratio by comprehensively evaluating the various properties of each ratio, and further select the optimal ratio scheme based on the score. Each performance such as luminous efficiency, chromaticity coordinates, color rendering index, etc. can be assigned different weights to reflect its importance in a specific application. Through weighted calculation, those phosphor ratio combinations with the best performance can be screened out, providing a basis for subsequent optimization and adjustment.

[0101] In this embodiment, the preset weights are set according to the requirements of the target application, and different backlight systems or light source applications have different requirements for different optical properties. For example, the backlight system of a TV or monitor may be more concerned with color gamut coverage and color rendering, while general lighting may be more concerned with luminous efficiency and color rendering index. For applications that need to emphasize color gamut coverage and color accuracy (such as displays, projectors, etc.), the weights of the chromaticity coordinates and color rendering index can be increased, and the weights of the chromaticity coordinates and color rendering index may be set to 60%-70%, while the weight of the luminous efficiency is appropriately reduced. S3710. According to the initial proportion combination with the highest first score, the initial proportion range is narrowed to obtain a target proportion range; Step S3710 further limits the initial proportion range based on the initial proportion combination with the highest score to obtain the target proportion range. The purpose of this stage is to further narrow the optimization space and lock in the most promising ratio scheme based on the previous test. By limiting the proportion range, the stability of the optical effect can be further improved to avoid the problem of unstable optical performance caused by excessive adjustment. The beneficial effect of this step is to find the target proportion range through comparative analysis, providing data support for the next step of optimization and adjustment.

[0102] S3711, determining a second preset number of intermediate proportion combinations within the target proportion range, wherein the second preset number is less than or equal to the first preset number; In step S3711, a second preset number of intermediate ratio combinations are determined within the target ratio range. The purpose of this stage is to further optimize the ratio results by refining the ratio. Based on the results of the first round of testing and analysis, a new ratio combination is selected to ensure that the optical performance of the final product is closer to the target. By increasing the number of combinations, a more detailed exploration can be carried out within the target ratio range, providing more reference data for the final optimization.

[0103] The second preset number refers to the number of proportion combinations determined after a more refined selection based on the preliminary test results (i.e., the first test results and the second test results). That is, based on the first preset number, a smaller range of proportion combinations is obtained through the first round of optimization (including scoring and narrowing), and finally the most promising proportion combination is selected for the second round of testing.

[0104] By exploring a large number of ratio combinations in the first stage, we can comprehensively cover different possibilities, and in the second stage, we can refine and select the optimal combination, reduce redundant tests and improve optimization efficiency. The setting of the second preset number helps to further refine the ratio configuration. Through the second round of testing, we can more accurately find the final optimal ratio combination and further improve the optical performance and color gamut coverage.

[0105] S3712, mixing the target premixed phosphors according to each of the intermediate proportion combinations to obtain the second preset quantity of intermediate mixed phosphors; In step S3712, the target premixed phosphor is mixed according to the intermediate ratio combination to obtain a second preset amount of intermediate mixed phosphor. This process will mix the target phosphor according to a more detailed ratio, thereby achieving more precise optical performance control. Through this step, more ratio combinations can be obtained to further verify which ratio combinations have a better contribution to optical performance.

[0106] S3713, performing an optical property test on each of the intermediate mixed phosphors according to the preset excitation conditions to obtain a third test result; Step S3713 again tests the optical properties of each intermediate mixed phosphor according to the preset excitation conditions to obtain a third test result. The purpose of this step is to verify the optical performance of the intermediate ratio combination and further optimize the ratio scheme.

[0107] S3714, performing weighted calculation on the second test result according to a preset weight to obtain a second score for each intermediate mixed phosphor; Step S3714 performs a weighted calculation on the third test result to obtain a second score for each intermediate mixed phosphor. Through the scoring at this stage, the contribution of different proportion combinations to the optical effect can be comprehensively evaluated, providing a basis for the final selection of the target ratio scheme.

[0108] S3715, determining the second preset ratio according to the intermediate proportion combination corresponding to the intermediate mixed phosphor with the second highest score; Step S3715 determines the second preset ratio according to the intermediate proportion combination corresponding to the intermediate mixed phosphor with the second highest score. The goal of this step is to finally determine the optimal proportion according to the intermediate scoring results to ensure that the final product has a good optical effect.

[0109] S3716. According to the second preset ratio, add the premixed phosphor into a stirring device and mix evenly to obtain the mixed phosphor.

[0110] In step S3716, the premixed phosphor is added to the stirring device for uniform mixing according to the second preset ratio to obtain the final mixed phosphor. This is the last step of the entire ratio optimization process. Through precise ratio and sufficient stirring, the optical performance of the final product is ensured to be stable and meet the predetermined effect requirements.

[0111] Preferably, analyzing the first test result of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor includes: S3751, drawing the color coverage of each target premixed phosphor according to the chromaticity coordinates of each target premixed phosphor in the first test result; Specifically, chromaticity coordinates refer to coordinates that represent the color of a light source, usually based on a chromaticity diagram. The chromaticity coordinates of each light source or phosphor determine the range and accuracy of its luminous color. Color coverage is the variable range of the luminous color of each phosphor on the chromaticity coordinate diagram. This range can be obtained through experimental data or simulation models. The chromaticity coordinates of each target premixed phosphor under specific excitation conditions are experimentally tested to plot their coverage areas in the chromaticity diagram. These coverage areas can be obtained by aggregating multiple test points and may present a circular, elliptical or other irregularly shaped area. Different phosphors have different color coverage due to their different luminous properties. By plotting the color coverage range, basic data can be provided for subsequent chromaticity adjustments. These data help determine which phosphors can contribute to a specific color gamut area and provide direction for optimizing color output.

[0112] S3752, performing weighted averaging on all chromaticity coordinate points in the color coverage range to obtain the chromaticity centroid position of each premixed phosphor; Specifically, the chromaticity centroid refers to the weighted average position of all chromaticity coordinate points within the color coverage range, which is similar to the geometric centroid and indicates the center position of the color gamut. By weighted averaging, the center position of the color coverage range of each phosphor, that is, the chromaticity centroid, is calculated to help analyze the contribution of different phosphors to the target color gamut. Weighted average all points within the chromaticity coordinate coverage range of each premixed phosphor. The weight of each chromaticity coordinate point can be assigned based on the distribution density of its position or its importance, resulting in a centroid position that centrally represents the color coverage area. The position of the chromaticity centroid can help further evaluate the difference between each phosphor and the target color gamut, and provide a quantitative basis for adjusting the proportion. The closer the centroid position is to the centroid of the target color gamut, the better it matches the target color gamut.

[0113] S3753, performing weighted averaging on all chromaticity coordinate points in a preset target color gamut to obtain a target centroid position; Specifically, the target color gamut refers to the ideal color range preset according to product requirements (such as display devices, lighting equipment, etc.). This is the color space expected to be achieved in the design. The target centroid position is the weighted average position of the chromaticity coordinate points in the target color gamut, representing the center of the target color gamut. By calculating the centroid position of the target color gamut, the desired final color balance and optimization target is determined as a standard for comparison with the chromaticity centroid of each phosphor. The target centroid provides a reference for the difference in centroid of each premixed phosphor, helping to identify and quantify the degree of deviation of different phosphors from the color gamut, thereby achieving accurate color matching.

[0114] S3754, determining the centroid distance of each premixed phosphor according to the Euclidean distance between the chromaticity centroid position and the target centroid position; Specifically, the Euclidean distance is the straight-line distance between two points in the chromaticity diagram, which represents the difference between the chromaticity coordinates. It is usually used to quantify the similarity or difference between two colors. The Euclidean distance between the chromaticity centroid and the target centroid reflects the deviation between the premixed phosphor chromaticity and the target color gamut. The difference between the centroid of each premixed phosphor and the target centroid is calculated to determine the degree of deviation from the target color gamut and provide a basis for adjusting the proportion. The calculation of the centroid difference provides a quantitative basis for color optimization, and it can be clearly seen which phosphors contribute more to the color gamut and which ones need further adjustment.

[0115] S3755, determining an upper limit value of an initial proportion range of each premixed phosphor according to the centroid difference, wherein the centroid difference is negatively correlated with the upper limit value; Specifically, the upper limit of the initial proportion of each phosphor is determined based on the negative correlation between the centroid gap and the upper limit value. The larger the centroid gap, the farther the chromaticity of the premixed phosphor deviates from the chromaticity centroid of the target color gamut. If the chromaticity centroid of a phosphor deviates far from the centroid of the target color gamut, it means that it has a greater impact on the final color gamut, so too high a proportion cannot be used, otherwise it will cause the deviation of the overall mixed color from the target color gamut to increase. In order to keep the color of the final mixture close to the target color gamut, it is necessary to limit the proportion of these phosphors. Therefore, the larger the centroid gap, the smaller the upper limit of the proportion of the premixed phosphor. S3756. Determine the minimum effective proportion based on the luminous efficiency of each target premixed phosphor; For each premixed phosphor, its minimum effective proportion in the mixed phosphor can be calculated so that it can contribute sufficient luminous efficiency. For example, for a phosphor with low luminous efficiency, its lower limit of proportion may need to be relatively high to ensure that it can emit light effectively and contribute to brightness. This step sets the minimum proportion of each premixed phosphor based on its luminous efficiency. This proportion is usually required to ensure that the luminous ability of each phosphor can meet the brightness requirements while avoiding color distortion caused by too low a proportion.

[0116] In one embodiment, for phosphors with a wider chromaticity range or higher luminous efficiency, the lower limit of the proportion can be appropriately lowered. For phosphors with lower luminous efficiency, the lower limit of the proportion must be increased to ensure that it can provide sufficient light output.

[0117] S3757, adjusting the minimum effective proportion according to the centroid difference to determine the lower limit of the initial proportion range of each premixed phosphor, wherein the centroid difference is positively correlated with the lower limit; Specifically, the minimum proportion of each premixed phosphor is adjusted according to the centroid gap. The larger the centroid gap, the smaller the contribution of the phosphor to the target color gamut. Therefore, the lower limit of its proportion can be appropriately increased to ensure that its light output is sufficient. By adjusting the lower limit value, it can be ensured that the minimum proportion of each phosphor is sufficient to ensure the luminous effect while avoiding excessive color gamut deviation. This helps to improve the flexibility and accuracy of color optimization.

[0118] S3758. Determine the initial proportion range of each target premixed phosphor in the mixed phosphor according to the upper limit value and the lower limit value.

[0119] Combine the upper and lower limits to determine the proportion of each phosphor in the mixture. Through multiple optimization adjustments, ensure that the final proportion can minimize the chromaticity gap and achieve the ideal color effect while meeting the luminous efficiency.

[0120] In this embodiment, the steps from S3751 to S3754 focus on accurately measuring the position and deviation of each phosphor in the target color gamut by calculating the difference between the chromaticity centroid of each premixed phosphor and the centroid of the target color gamut. Finally, the difference is quantified by calculating the Euclidean distance, and then the proportion of phosphors is optimized so that the difference with the target color gamut can be minimized as much as possible. This process ensures that the contribution of different phosphors to the color gamut is accurately controlled, and avoids excessive deviation of the color from the target, maintaining the consistency and accuracy of the color. Through this optimization, the color performance of the final product can be closer to the preset target color gamut. By analyzing the luminous efficiency of each phosphor (in S3756) and adjusting the minimum proportion in combination with the centroid difference (in S3757), the contribution of each phosphor in the mixture can be balanced. For phosphors with lower luminous efficiency, although their contribution to color is smaller, it is still necessary to ensure that their luminous effect will not be too weakened. Therefore, setting a minimum effective ratio can ensure that low-efficiency phosphors can still provide sufficient brightness. At the same time, by adjusting the lower limit of the ratio, its light output can be prevented from being too low to affect the overall effect.

[0121] By calculating the centroid gap and chromaticity coordinates, we ensure that the color output of each phosphor is close to the target color gamut to avoid color distortion. By minimizing the effective percentage and flexibly adjusting the percentage range, we ensure the balance of luminous efficiency without affecting brightness.

[0122] S4, slowly adding the mixed phosphor into the AB curing encapsulation glue, and continue stirring to ensure that the phosphor is evenly distributed in the colloid to obtain a mixed colloid; Slowly add the mixed phosphor to the AB type curing encapsulation glue and stir evenly. AB glue is a two-component encapsulation material that can provide good protection and sealing, while having good optical transparency. The well-mixed colloid can ensure that the phosphor is evenly distributed in the colloid, so that each area can effectively excite red and green light, ensuring the consistency and stability of luminescence.

[0123] S5. Coat the mixed colloid on the surface of the LED blue light chip, and cure it under preset temperature and humidity conditions to obtain a target light-emitting semiconductor device after a preset time.

[0124] The mixed colloid is evenly coated on the surface of the LED blue light chip, so that the light emitted by the blue light chip can evenly excite the phosphor. Then, it is cured under the preset temperature and humidity conditions to ensure that the AB glue is completely hardened, fix the position of the phosphor, and form a stable encapsulation layer. After a period of curing treatment, a semiconductor device with high color gamut luminescence characteristics is obtained.

[0125] Preferably, after coating the mixed colloid on the surface of the LED blue light chip and curing it under preset temperature and humidity conditions to obtain the backlight high color gamut light-emitting semiconductor device after a preset time, the method further comprises: Connect the target light-emitting semiconductor device to a power source and use an electrical parameter tester to detect its operating current and operating voltage; Connect the target light-emitting semiconductor device to the power supply and use an electrical parameter tester to detect its operating current and voltage. This step is mainly to confirm that the device works normally under the rated voltage and current, and to ensure that the current and voltage characteristics meet the design requirements. Current and voltage testing are very important for subsequent performance evaluation and safety testing.

[0126] The target light-emitting semiconductor device is placed in an integrating sphere, and the luminous flux is measured using an integrating sphere photometer after power is turned on; Place the target light-emitting semiconductor device in an integrating sphere and use an integrating sphere photometer to measure the luminous flux after power is turned on. An integrating sphere is a common device for measuring the total luminous flux of a light source. It can capture all the light emitted from the device and obtain accurate luminous flux data through the diffuse reflection of the internal coating. Luminous flux is an important indicator for measuring the luminous intensity of a light source to ensure that it meets the brightness requirements of the design.

[0127] Using a spectrum analyzer to measure the spectral distribution and color rendering index of the target light-emitting semiconductor device; Use a spectrum analyzer to measure the spectral distribution and color rendering index of the target light-emitting semiconductor device. The spectral distribution can show the light intensity distribution of the device at different wavelengths, helping to understand the color characteristics of the device's light; the color rendering index reflects the device's ability to truly restore the color of an object and is a key parameter for evaluating the quality of a light source.

[0128] Acquiring the chromaticity coordinates and color temperature of the target light-emitting semiconductor according to the spectral distribution; Based on the measured spectral distribution data, the chromaticity coordinates and color temperature of the target light-emitting semiconductor device are calculated. The chromaticity coordinates indicate the color position of the device's light and are used to quantify its color performance; the color temperature is used to describe whether the light source is cool or warm, and is usually used to evaluate visual comfort and color effects.

[0129] The target light-emitting semiconductor device is placed in a constant current environment, and after power is turned on, the chromaticity coordinate change of the light emitted over time is tested to obtain the color deviation; Place the target light-emitting semiconductor device in a constant current environment, and test the change in chromaticity coordinates of its light emission over time after power is turned on to obtain color shift data. The color shift test is to detect whether the light color of the device shifts during long-term operation, so as to evaluate its stability. Devices with smaller color shift can maintain color consistency during long-term use and are suitable for high-demand backlight applications.

[0130] According to the operating voltage, operating current, luminous flux, chromaticity coordinates, color rendering index, color temperature and color deviation, determining whether the target light-emitting semiconductor device meets the preset photoelectric test conditions; Based on key parameters such as operating voltage, operating current, luminous flux, chromaticity coordinates, color rendering index, color temperature and color deviation, determine whether the target light-emitting semiconductor device meets the preset photoelectric test conditions. The preset conditions are formulated according to application requirements, and only devices that meet these standards are considered qualified.

[0131] If the conditions are met, the target light-emitting semiconductor device is packaged and shipped.

[0132] If the target light-emitting semiconductor device meets all the optoelectronic performance requirements, it will be packaged and prepared for shipment. This step ensures that the device shipped is reliable and meets the actual needs of customers.

[0133] In a specific embodiment, the measured average voltage is 3.270 V. This means that under standard test conditions, the operating voltage of the comparison group LED is 3.270 volts, which is within the normal range and close to the voltage values ​​of other sample groups. The average luminous flux is 184.73 lm. Luminous flux represents the total amount of light emitted by a light source per unit time. The value of 184.73 lumens is relatively high, and the average luminous efficiency is 94.16 lm / W. Luminous efficiency refers to the luminous flux converted per watt of electrical power. The luminous efficiency of the comparison group is less than 100 lm / W. The color coordinates are X: 0.2727 and Y: 0.2565. These values ​​are used to define the chromaticity position of the comparison group light source. The color temperature is 15272 K and the color gamut value is 93.51, indicating that the luminous flux did not change significantly during the test and the light source has good stability. In this specific embodiment, the color gamut target diagram of the target light-emitting semiconductor device is as shown in Figure 4 As shown, Figure 4 Each mark (such as EM13, EM12, etc.) represents a specific color area. These areas indicate the color range that can be presented on devices such as displays and light sources. They have a wide color gamut coverage and can present a rich and accurate color range. The different color areas in the color gamut target diagram indicate that the device can achieve accurate light emission at different color coordinates, showing high color gamut coverage, good color accuracy, stability and fine spectral control capabilities, suitable for high-precision display scenes. Color tuning can be further achieved by adjusting the driving parameters, and has a wide range of application potential, including high-end displays, outdoor screens, and scenes that require accurate color reproduction.

[0134] In summary, the beneficial effects of the present invention are as follows: The high color gamut light-emitting semiconductor device for backlight and the preparation method thereof provided in the embodiment of the present invention can achieve maximum coverage of the color gamut by selecting a blue light chip with a wavelength range of 440-470 nm, controlling the peak wavelength of the green phosphor to 525-545 nm, and the peak wavelength of the red phosphor to 625-635 nm. This spectral distribution can effectively enhance the purity of the three primary colors of red, green and blue, so that the display device has a wider color gamut range, thereby significantly improving the color reproduction and realism. Due to the selection of a combination of efficient blue light LED chips and high quantum yield phosphors, the overall luminous efficiency is improved and the energy loss is reduced. At the same time, due to the high light conversion efficiency of the phosphor, the power consumption is effectively controlled under the premise of providing sufficient brightness, which helps to save energy. By strictly controlling the wavelength range of the phosphor, the light output of each wavelength region is more stable and uniform. This can effectively reduce the color deviation problem, so that the image can maintain consistent color performance at different angles and brightness, and enhance the uniformity and consistency of the image. In summary, this invention not only improves the color gamut coverage of light-emitting semiconductor devices by precisely controlling the wavelength distribution of chips and phosphors, but also takes into account high brightness, low power consumption and consistent color performance, and has excellent application prospects.

[0135] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0136] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0137] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A high color gamut light-emitting semiconductor device for backlight, characterized in that: include: LED blue light chip; Phosphor; The phosphor comprises a green phosphor and a red phosphor, the peak wavelength of the green phosphor is within a first wavelength range, the peak wavelength of the red phosphor is within a second wavelength range, the first wavelength range is 525-545 nm, and the second wavelength range is 625-635 nm; The main wavelength of the LED blue light chip is in the third wavelength range, and the third wavelength range is 440-470nm.

2. The high color gamut light-emitting semiconductor device for backlighting according to claim 1, characterized in that: The first wavelength range is 533-537 nm, and the second wavelength range is 630-634 nm.

3. The high color gamut light-emitting semiconductor device for backlighting according to claim 2, characterized in that: The particle size range of the green phosphor is 11.0-19.0 µm, the target particle size of the red phosphor is 22.0-28.0 µm, the CIE color coordinates of the green phosphor are between (0.273, 0.679) and (0.283, 0.690), and the CIE color coordinates of the red phosphor are between (0.690, 0.304) and (0.696, 0.310).

4. The high color gamut light-emitting semiconductor device for backlighting according to any one of claims 1 to 3, characterized in that: The green phosphor is nitrogen oxide, and the red phosphor is fluoride.

5. The high color gamut light-emitting semiconductor device for backlighting according to claim 4, characterized in that: It also includes AB curing encapsulation glue, the mass percentage of the green phosphor is 6.33%, the mass percentage of the red phosphor is 37.97%, and the mass percentage of the AB curing encapsulation glue is 55.70%.

6. A method for preparing a high color gamut light-emitting semiconductor device for backlight, characterized in that: The high color gamut light-emitting semiconductor device for backlighting according to any one of claims 1 to 5, wherein the preparation method comprises: Processing the EMC red copper substrate to obtain a target substrate, wherein the target substrate includes a 0.2 mm red copper layer and a 100 μm additional copper layer; Placing the LED blue light chip in a round cup packaging structure, and fixing the LED blue light chip on the target substrate; Weighing the red phosphor and the green phosphor according to a first preset ratio, and uniformly mixing them to obtain a mixed phosphor; Slowly add the mixed phosphor into the AB curing encapsulation glue and continue stirring to ensure that the phosphor is evenly distributed in the colloid to obtain a mixed colloid; The mixed colloid is coated on the surface of the LED blue light chip, and is cured under preset temperature and humidity conditions, and a target light-emitting semiconductor device is obtained after a preset time.

7. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 6, characterized in that: After the mixed colloid is coated on the surface of the LED blue light chip and cured under preset temperature and humidity conditions, and the high color gamut light-emitting semiconductor device for backlight is obtained after a preset time, the method further includes: Connect the target light-emitting semiconductor device to a power source and use an electrical parameter tester to detect its operating current and operating voltage; The target light-emitting semiconductor device is placed in an integrating sphere, and the luminous flux is measured using an integrating sphere photometer after power is turned on; Using a spectrum analyzer to measure the spectral distribution and color rendering index of the target light-emitting semiconductor device; Acquiring the chromaticity coordinates and color temperature of the target light-emitting semiconductor according to the spectral distribution; The target light-emitting semiconductor device is placed in a constant current environment, and after power is turned on, the chromaticity coordinate change of the light emitted over time is tested to obtain the color deviation; Determining whether the target light-emitting semiconductor device meets preset photoelectric test conditions according to the operating voltage, operating current, luminous flux, chromaticity coordinates, color rendering index, color temperature and color deviation; If the conditions are met, the target light-emitting semiconductor device is packaged and shipped.

8. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 6, characterized in that: The red phosphor and the green phosphor are weighed according to a first preset ratio, and are uniformly mixed to obtain a mixed phosphor, comprising: Dividing the particle size range of the red phosphor to obtain more than two first target particle size ranges; Screening the red phosphor according to the first target particle size range to obtain target red phosphors belonging to different first target particle size ranges; Dividing the target particle size range of the green phosphor to obtain more than two second target particle size ranges; Screening the red phosphor according to the second target particle size range to obtain target green phosphors belonging to different second target particle size ranges; Determining a correspondence between red phosphors corresponding to the first target particle size range and green phosphors corresponding to the second target particle size range according to the difference between the first target particle size range and the second target particle size range; According to the corresponding relationship and the first preset ratio, each of the target red phosphors and the corresponding target green phosphors are added to a stirring device for premixing to obtain a plurality of premixed phosphors; According to the second preset ratio, the premixed phosphors are sequentially added into a stirring device and evenly mixed to obtain the mixed phosphors.

9. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 8, characterized in that: The step of adding the premixed phosphor powder into a stirring device and uniformly mixing the premixed phosphor powder in sequence according to the second preset ratio to obtain the mixed phosphor powder comprises: Performing an optical property test on each of the premixed phosphors according to a preset excitation condition to obtain a first test result, wherein the first test result at least includes luminous efficiency, chromaticity coordinates and color rendering index; Performing a one-way ANOVA on each of the first test results to obtain a one-way ANOVA result; Determine whether there is a significant difference between the premixed phosphors according to the one-way analysis of variance result; If there is, the premixed phosphor with significant difference is used as the target premixed phosphor; Analyze the first test result of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor; Determine a first preset number of initial proportion combinations within the initial proportion range, wherein the first preset number is positively correlated with the number of the target premixed phosphors, and the initial proportion combination includes the proportion of each target premixed phosphor in the mixed phosphor; in different proportion combinations, the proportions of at least two target premixed phosphors are different; Mixing the target premixed phosphors according to the respective proportion combinations to obtain the first preset quantity of initial mixed phosphors; Performing an optical property test on each of the initial mixed phosphors according to the preset excitation conditions to obtain a second test result, wherein the second test result includes luminous efficiency, chromaticity coordinates and color rendering index; Performing weighted calculation on the second test result according to a preset weight to obtain a first score for each initial mixed phosphor; According to the initial proportion combination with the highest first score, the initial proportion range is narrowed to obtain a target proportion range; Determine a second preset number of intermediate proportion combinations within the target proportion range, wherein the second preset number is less than or equal to the first preset number; The target premixed phosphors are mixed according to each of the intermediate proportion combinations to obtain the second preset quantity of intermediate mixed phosphors; Performing an optical property test on each of the intermediate mixed phosphors according to the preset excitation conditions to obtain a third test result; Performing weighted calculation on the second test result according to a preset weight to obtain a second score for each intermediate mixed phosphor; Determine the second preset ratio according to the intermediate proportion combination corresponding to the intermediate mixed phosphor with the second highest score; According to the second preset ratio, the premixed phosphor is added into a stirring device and mixed evenly to obtain the mixed phosphor.

10. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 9, characterized in that: The analyzing the first test result of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor includes: According to the chromaticity coordinates of each target premixed phosphor in the first test result, plotting the color coverage of each target premixed phosphor; Taking a weighted average of all chromaticity coordinate points in the color coverage range, obtaining the chromaticity centroid position of each premixed phosphor; The target centroid position is obtained by weighted averaging all chromaticity coordinate points in the preset target color gamut; Determining the centroid distance of each premixed phosphor according to the Euclidean distance between the chromaticity centroid position and the target centroid position; According to the centroid gap, determining an upper limit value of the initial proportion range of each premixed phosphor, wherein the centroid gap is negatively correlated with the upper limit value; Determine the minimum effective ratio based on the luminous efficiency of each target premixed phosphor; The minimum effective proportion is adjusted according to the centroid difference to determine the lower limit of the initial proportion range of each premixed phosphor, wherein the centroid difference is positively correlated with the lower limit; According to the upper limit value and the lower limit value, an initial proportion range of each of the target premixed phosphors in the mixed phosphor is determined.

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