A high-color gamut light-emitting semiconductor device for backlight and a preparation method thereof

Abstract

The present invention belongs to the technical field of LEDs, and solves the technical problem that existing backlights usually use white LEDs and cannot meet the requirements of high color gamut. A high-color-gamut light-emitting semiconductor device for backlighting and a preparation method thereof are provided, which include: an LED blue chip and phosphors; the phosphors include 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 dominant wavelength of the LED blue chip is within a third wavelength range, and the third wavelength range is 440 - 470 nm. By reasonably selecting the wavelength ranges of the blue chip and the green and red phosphors, the present invention can greatly improve the color gamut coverage rate of the light-emitting semiconductor device, providing an ideal backlight for high-color-gamut display applications.

Description

Technical Field

[0001] The present invention relates to the field of LEDs, and particularly 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, televisions, and smartphones. Especially in terms of color performance, they hope to achieve a higher color gamut coverage rate to achieve a more realistic and rich picture effect. Therefore, high-color gamut display technology has become a research 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, developing a light-emitting semiconductor device for backlighting with high-color gamut performance has become the research focus in the industry.

[0003] Traditional backlight sources usually use white LEDs, usually blue chips to excite yellow phosphors or a combination of blue chips and red and green phosphors to generate white light. However, the spectral bandwidth of traditional yellow phosphors is relatively wide, which cannot meet the requirements of high color gamut. In addition, the luminous efficiency of red phosphors is relatively low, often resulting in poor red performance and difficult to meet the needs of high-color gamut displays. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a high-color gamut light-emitting semiconductor device for backlighting and a preparation method thereof, so as to solve the technical problem that existing backlight sources usually use white LEDs and cannot meet the requirements of high color gamut.

[0005] In a first aspect, embodiments of the present invention provide a high-color gamut light-emitting semiconductor device for backlighting, including:

[0006] An LED blue chip;

[0007] Phosphors;

[0008] The phosphors include green phosphors and red phosphors. The peak wavelength of the green phosphors is within a first wavelength range, and the peak wavelength of the red phosphors is within a second wavelength range. The first wavelength range is 525 - 545 nm, and the second wavelength range is 625 - 635 nm;

[0009] The main wavelength of the LED blue chip is within a third wavelength range, and the third wavelength range is 440 - 470 nm.

[0010] In a second aspect, embodiments of the present invention further provide a preparation method of a high-color gamut light-emitting semiconductor device for backlighting, which is used for the high-color gamut light-emitting semiconductor device for backlighting according to any item in the first aspect. The preparation method includes:

[0011] Process the EMC copper substrate to obtain a target substrate, where the target substrate includes a 0.2-mm copper layer and a 100-μm additional copper layer;

[0012] Place the LED blue chip in a round cup-shaped encapsulation structure and fix the LED blue chip on the target substrate;

[0013] Weigh the red phosphor and the green phosphor according to a first preset ratio and mix them evenly to obtain a mixed phosphor;

[0014] 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;

[0015] Coat the mixed colloid on the surface of the LED blue chip and cure it under preset temperature and humidity conditions to obtain a target light-emitting semiconductor device after a preset time.

[0016] In summary, the beneficial effects of the present invention are as follows:

[0017] The high-color gamut light-emitting semiconductor device for backlight and its preparation method provided by the embodiments of the present invention can achieve the maximum coverage of the color gamut by selecting a blue chip with a wavelength range of 440-470 nm and controlling the peak wavelength of the green phosphor at 525-545 nm and the peak wavelength of the red phosphor at 625-635 nm. This spectral distribution can effectively enhance the purity of the three primary colors of red, green, and blue, enabling the display device to have a wider color gamut range, thereby significantly improving color reducibility and realism. Due to the selection of a combination of a high-efficiency blue LED chip and a phosphor with a high quantum yield, 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 on the premise of providing sufficient brightness, which helps to save energy. By strictly controlling the wavelength range of the phosphor, the light output in each wavelength region is more stable and uniform. This can effectively reduce the color deviation problem, enabling the image to maintain consistent color performance at different angles and brightness levels, and enhancing the uniformity and consistency of the image. In summary, the invention improves the color gamut coverage rate of the light-emitting semiconductor device by precisely regulating the wavelength distribution of the chip and the phosphor, while also taking into account high brightness, low power consumption, and consistent color performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, and all of these are within the protection scope of the present invention.

[0019] Figure 1 This is the emission spectrum diagram of the green phosphor of the embodiment of the present invention.

[0020] Figure 2 This is the particle size distribution diagram of the green phosphor of the embodiment of the present invention.

[0021] Figure 3 This is the excitation and emission spectrum diagram of the red phosphor of the embodiment of the present invention.

[0022] Figure 4 This is the color gamut target diagram of the high-color-gamut light-emitting semiconductor device for backlight in the embodiment of the present invention.

[0023] Figure 5a It is for the embodiment of the present invention Figure 4 A chromaticity coordinate table diagram corresponding to the color gamut target diagram.

[0024] Figure 5b It is for the embodiment of the present invention Figure 4 Another chromaticity coordinate table diagram corresponding to the color gamut target diagram.

[0025] Figure 5c It is for the embodiment of the present invention Figure 4 Another chromaticity coordinate table diagram corresponding to the color gamut target diagram. Detailed implementation manners

[0026] Next, the features and exemplary embodiments of various aspects of the present invention will be described in detail. To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. 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 some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0028] Embodiment 1

[0029] An embodiment of the present invention provides a high-color gamut light-emitting semiconductor device for a backlight, including:

[0030] An LED blue light chip;

[0031] Phosphor;

[0032] The phosphor includes a green phosphor and a red phosphor. 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. The first wavelength range is 525 - 545 nm, and the second wavelength range is 625 - 635 nm;

[0033] The main wavelength of the LED blue light chip is within a third wavelength range, and the third wavelength range is 440 - 470 nm.

[0034] Specifically, for the blue light LED chip, its main wavelength is within the third wavelength range between 440 - 470 nm. The blue light within this wavelength range can provide the target excitation energy for the green and red phosphors, enabling the phosphors to emit light efficiently. At the same time, the blue light wavelength within this range is located in the visually sensitive blue region, which helps to improve the color purity of blue and provides a pure blue light output for the display system.

[0035] In this device, the phosphor is divided into a green phosphor and a red phosphor, which are respectively used to emit green and red light. This combination of red and green phosphors can emit a spectral distribution that conforms to the RGB color gamut after being excited by the blue light chip, thereby expanding the color gamut coverage. Compared with the yellow phosphor combination of traditional white LEDs, this combination of red and green phosphors can provide more accurate and higher-purity green and red light, making the backlight more suitable for high-color gamut display requirements.

[0036] The peak wavelength of the green phosphor is limited within 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 - 570 nm), which can effectively enhance the color saturation and gamut performance of the light-emitting semiconductor device, especially in display technology. Green light is one of the three primary colors of RGB (red, green, blue). Controlling the wavelength of the green phosphor can improve the color accuracy of the device, making the color presentation more real and rich. In an LED device with blue light (usually with a peak at 450 - 470 nm) as the excitation source, the wavelength range of the green phosphor (525 - 545 nm) can effectively absorb the blue light and convert it into green light. By limiting the peak wavelength of the green phosphor within this range, it ensures that the generation of green light has good efficiency and spectral matching under blue light excitation. This matching is crucial for improving the light output efficiency of the LED device.

[0037] The peak wavelength of the red phosphor is set within the second wavelength range of 625 - 635 nm. The red light wavelength in this range belongs to the sensitive area of visual red light, which can provide a high-purity red light output. When combined with the green phosphor and the blue chip, it can achieve a wider gamut coverage in the CIE chromaticity diagram, especially with better performance in the red region. This red phosphor with a specific wavelength has a high luminous efficiency under blue light excitation, which can significantly enhance the red performance of the display and improve the realism and color saturation of the overall image.

[0038] The main wavelength of the blue chip is selected within the third wavelength range of 440 - 470 nm. This wavelength range not only meets the human eye's perception requirements for blue light but also can efficiently excite the red and green phosphors. The blue light wavelength in this range usually has a high luminous efficiency, making the conversion efficiency of the phosphor higher, enabling a strong blue light output and effectively converting it into red and green light, thereby enhancing the overall brightness and color performance. The selection of the blue light wavelength can also further reduce the dependence on other optical components, simplify the system design, and control costs.

[0039] Preferably, the first wavelength range is 533 - 537 nm, and the second wavelength range is 630 - 634 nm.

[0040] See Figures 1-3 , setting the peak wavelength of the green phosphor at 533 - 537 nm and the peak wavelength of the red phosphor at 630 - 634 nm is to further optimize the gamut coverage and color purity of the backlight. Specifically, such a choice is based on the following considerations:

[0041] The wavelength range of green light lies in the region where the human eye is most sensitive to green visually (about 510 - 570 nm). Setting the peak wavelength of the green phosphor in the narrow range of 533 - 537 nm can ensure that the green light emitted by this phosphor has very high purity. This not only helps to improve the performance of the display in the green region but also avoids the presence of miscellaneous color components in the spectrum, ensuring more vivid and accurate colors.

[0042] Green light with a wavelength set at 533 - 537 nm can cooperate well with the excitation light of blue light wavelength (440 - 470 nm), ensuring a relatively high quantum efficiency (i.e., the conversion efficiency of the phosphor). Therefore, this setting helps to increase the brightness output of green light and enhance the brightness performance of the green region of the display. Selecting green phosphors in this wavelength range can more accurately simulate the green light in the natural environment, enhancing the naturalness of vision and making the colors of the image more realistic and vivid.

[0043] The wavelength of red light is approximately 620 - 650 nm visually, and the wavelength range of 630 - 634 nm is exactly within the sensitive range of visual red light, which can ensure that red light has high purity and high saturation. The red light emitted by the red phosphor in this wavelength range is closer to the natural perception of red by the human eye, greatly enhancing the red performance of the display system.

[0044] The gamut range and color saturation of red light are important factors for gamut expansion. By optimizing the peak wavelength of the red phosphor to 630 - 634 nm, the color purity of the red part can be effectively improved, thereby expanding the gamut of the overall display system. Especially in the red region, the performance is more prominent, enabling the display device to cover a wider range of colors and enhancing the layering and realism of the display.

[0045] The peak wavelength of the red phosphor is in the relatively narrow range of 630 - 634 nm, which can make the spectral matching between blue light (440 - 470 nm) and green light (533 - 537 nm) more coordinated, making the overall color distribution of the display more balanced and saturated, and avoiding color shift or distortion caused by traditional yellow light (such as the yellow light in the phosphor combination).

[0046] The wavelengths of the green and red phosphors are set within this preferred range, which can maximize the color accuracy of the display, especially the color performance in the green and red regions. This is particularly important for high-color gamut displays (such as displays with the DCI-P3 color gamut standard) as it can provide richer and more accurate colors. When selecting a blue light chip with a peak wavelength of 440 - 470 nm, higher conversion efficiency can be obtained by exciting these two precisely wavelength phosphors (green and red), reducing energy loss, and improving the overall brightness performance. The matching of the blue light with these phosphors also helps to simplify the optical system design and improve the light emission efficiency.

[0047] In summary, the optimized wavelength of the green phosphor is 533 - 537 nm and the wavelength of the red phosphor is 630 - 634 nm, which further precisely 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.

[0048] Preferably, the particle size of the green phosphor is between 11.0 - 19.0 µm, and the particle size of the red phosphor is between 22.0 - 28.0 µm.

[0049] As Figure 2 shown, it is the particle size distribution diagram of the green phosphor, which describes the distribution of particles in the range of 5.1 microns to 23.6 microns. The bar chart in the figure represents the proportion of particles with different particle sizes in the total sample. The curve shows that as the particle size increases, the passing rate of the particles gradually increases and finally approaches 100%. This means that most particles can pass through a sieve with a larger pore size.

[0050] Specifically, the selection of the particle size of the phosphor directly affects its optical properties, especially its response efficiency to the excitation of the blue light chip, 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 light scattering, resulting in the inability of light to effectively propagate to the entire display area, thereby affecting the light output uniformity. The particle size of the green phosphor between 11.0 - 19.0 µm helps it to match the target blue light excitation wavelength, ensuring a high excitation efficiency. The green phosphor 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 result in insufficient light emission efficiency, while too large a particle size may make the phosphor particles too coarse, reducing the conversion efficiency and luminous uniformity. This particle size range can achieve an ideal light scattering effect, ensuring uniform light distribution and avoiding the occurrence of "hot spots" or local brightness non-uniformity. Through reasonable particle size design, the aggregation of phosphor particles can be effectively avoided, thus ensuring the light brightness consistency and color uniformity of the display screen.

[0051] The emission efficiency of red light is greatly affected by the particle size. An appropriate particle size can optimize the excitation and emission characteristics of the red phosphor. Setting the particle size range at 22.0 - 28.0 µm can ensure the efficient absorption of blue light by the red phosphor and effectively convert it into red light with a relatively high purity, while avoiding the problem of decreased luminous efficiency that may be caused by too large particle sizes. The relatively large particle size of the red phosphor is mainly to optimize the scattering characteristics of red light. Larger particles help to improve the directivity and brightness output of red light, thus enhancing the performance of the red part in the display device. Too small particles may lead to non - concentrated emission of red light, affecting the color purity and display effect. The emission of red light requires a high - purity wavelength output. An appropriate particle size helps to avoid the broadening of the red spectrum and ensure its emission characteristics within the narrow wavelength range of 630 - 634 nm, improving the color saturation and accuracy of the red area in the display.

[0052] The high - purity output of green and red light is crucial for gamut expansion. Appropriate particle size design can ensure that green and red phosphors emit light efficiently and uniformly under the excitation of blue light, thus achieving a good match and color coverage of the RGB gamut. Selecting a particle size of 11.0 - 19.0 µm for the green phosphor and 22.0 - 28.0 µm for the red phosphor helps to ensure the stability of the phosphor manufacturing process and guarantee the consistency of particle size during actual production. Phosphors with too small or too large particle sizes may lead to uneven particle distribution, affecting the uniformity and consistency of the final display effect. The combination of setting the green phosphor particle size at 11.0 - 19.0 µm and the red phosphor particle size at 22.0 - 28.0 µm helps to ensure color purity, brightness uniformity, and optical efficiency of the display while expanding the gamut. The design of this particle size range fully considers luminous efficiency, brightness uniformity, color performance, and the feasibility of the production process, and can effectively improve the performance of the display, especially for high - end display applications that require accurate colors and high - brightness output.

[0053] In summary, the selection of these particle size ranges can optimize the luminous efficiency, enhance the light uniformity, and improve the overall performance of the display effect, especially in terms of color accuracy and brightness, ensuring a high - gamut and high - brightness output of the backlight, meeting the requirements of high - end displays.

[0054] 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).

[0055] Specifically, CIE color coordinates are a commonly used standard method in color science to describe the position of a color in a chromaticity diagram. The more precise the color coordinates, the higher the purity and color accuracy of the color. Selecting these specific ranges of CIE color coordinates can ensure that the color output of the phosphor has high purity and high color accuracy, thereby enhancing the color performance of the display system.

[0056] The CIE color coordinate range of the green phosphor is between (0.273, 0.679) and (0.283, 0.690). This coordinate range is located in the green region of the CIE chromaticity diagram, indicating that this green phosphor can output pure green light under blue light excitation and is close to the natural perception of green by the human eye. The green light wavelength in this range can visually provide a distinct and natural green effect, enhancing the color performance in the green region and making the green in the display appear with higher purity and saturation.

[0057] The CIE color coordinate range of the red phosphor is (0.690, 0.304) to (0.696, 0.310). This coordinate range is located in the red region of the CIE chromaticity diagram and can provide very high-purity red light. Selecting the red phosphor within 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 region in the display system, making the image more vivid and realistic and improving the overall color saturation. The precise setting of the CIE color coordinates of the 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 crucial significance for modern display technologies, especially for displays that require a high color gamut (such as standards like DCI-P3, Adobe RGB, etc.). 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 the green and red light not only help to expand the color gamut but also ensure the balance between different colors. For example, overly blue-shifted red or green can affect the entire display effect, while the precise CIE color coordinate setting ensures the target combination of the three primary colors (RGB) in the chromaticity diagram, enabling the entire display system to display richer and more balanced colors. Precise CIE color coordinates can not only improve the color purity of the green and red light but also promote the expansion of the color gamut and the balanced distribution of colors in the entire display system, thereby enhancing the display effect. Especially in display fields with rich colors and high-precision requirements, such as professional displays, televisions, computer monitors, etc., the optimization of the CIE color coordinates of the green and red phosphors significantly improves the overall color performance and image realism.

[0058] Preferably, the green phosphor is a nitrogen oxide, and the red phosphor is a fluoride.

[0059] Specifically, nitrogen oxide-based green phosphors (such as SiAlON, CaAl2O4N2) usually have high luminous efficiency and strong stability.

[0060] This is because nitrogen oxide materials can maintain good chemical stability under high temperature or other extreme conditions, avoiding performance degradation due to thermal decay or oxidation during long-term use. Nitrogen oxide phosphors usually have a high quantum efficiency, that is, a high energy conversion efficiency. They can more effectively convert blue light into green light, which helps to improve the brightness and color performance of displays, especially in high-brightness display devices. The spectral output of nitrogen oxide-based green phosphors is relatively concentrated, capable of providing high-purity green light, avoiding excessive spectral width leading to color mixing, thereby enhancing the color purity in the green region and making the display effect more accurate. Nitrogen oxide materials are more environmentally friendly than traditional rare earth elements (such as lanthanide elements) in some cases, with lower toxicity and environmental impact, so they are increasingly favored in the application of green phosphors.

[0061] Fluoride-based red phosphors (such as yttrium fluoride, aluminum fluoride, K2SiF6:Mn 4+ etc.) usually have very high luminous efficiency and can effectively convert blue light excitation into high-purity red light. The red spectrum of fluoride materials is relatively concentrated and has high saturation, which helps to improve the performance of the red region of display devices, making the display effect more vivid and accurate. Fluoride-based phosphors usually have better thermal stability than other types of phosphors at higher temperatures. This enables them to be less affected by temperature in long-term, high-brightness usage environments, maintaining high luminous efficiency and low decay rate, and enhancing the long-term stability of the display system.

[0062] The combination of nitrogen oxide-based green phosphors and fluoride-based red phosphors can achieve the target luminous efficiency and color purity. Nitrogen oxide-based green phosphors provide high-brightness and high-purity green light, while fluoride-based red phosphors provide high-efficiency and high-saturation red light. The combination of the two enables the display system to achieve a wide color gamut coverage, especially the expansion of the green and red regions, enhancing the color performance of the entire display system. The high quantum efficiency of nitrogen oxide green phosphors and the high luminous efficiency of fluoride red phosphors work together to optimize the balance of the display system in terms of brightness and color saturation, meeting the requirements of high-color gamut displays. The high thermal stability and high chemical stability of nitrogen oxide green phosphors and fluoride red phosphors enable the backlight to maintain stable performance under high-brightness and long-term use conditions, reducing decay and color shift, thereby enhancing the service life and reliability of the display.

[0063] Preferably, it also includes AB curing encapsulation glue.

[0064] Specifically, the AB curing encapsulant is usually composed of two components (Component A and Component B), which cures after mixing and 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 the AB curing encapsulant is to protect the internal optoelectronic components (such as LED chips and phosphors). It can effectively isolate the influence of external environmental factors (such as moisture, dust, temperature, etc.) on the chips, 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, enhancing the mechanical strength and seismic resistance of the LED backlight. This helps to maintain the package integrity under conditions of high temperature, high humidity and long-term use, and avoid package damage or cracking caused by physical impact or temperature changes. By using the encapsulant, the scattering and reflection losses of light can be effectively reduced, and the light transmittance and transmission efficiency can be improved. The optical properties of the encapsulant (such as high light transmittance, low refractive index) help to improve the brightness and color performance of the LED light source, and avoid light attenuation caused by material mismatch.

[0065] The AB curing encapsulant generally has very high transparency, which can ensure that the light output of the LED chip and phosphor is not hindered by the encapsulant material. This high transparency can ensure that blue light effectively passes through the chip, excites the green and red phosphors to emit light, while reducing light loss and improving the overall brightness and light efficiency. The AB curing encapsulant can optimize the propagation path of the LED light by adjusting its refractive index, thereby reducing light reflection and scattering, ensuring the directivity of light, and improving the optical performance of the display. This is particularly important for high-brightness, wide-color gamut backlights. By adding the AB curing encapsulant, the mechanical strength, thermal management ability and optical performance of the entire backlight can be effectively improved. The properties of the encapsulant such as high transparency, high temperature resistance, ultraviolet resistance and electrical insulation make the backlight enhance its durability and stability while improving the brightness and color performance. 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 displays.

[0066] Preferably, the mass percentage of the green phosphor is between 6.33% and 11.02%, the mass percentage of the red phosphor is 21.98% to 37.97%, and the mass percentage of the AB curing encapsulant is 55.70% to 69.07%.

[0067] Specifically, the mass percentage of the green phosphor directly affects the output intensity and purity of green light in the display system. The proportion of green phosphor within this range can ensure that the excited blue light can fully excite the green phosphor, generating high-purity green light and optimizing the color performance of the green region in the display system. An excessively high proportion of green phosphor may lead to an over-enhancement of green light, affecting color balance. Therefore, a moderate proportion setting helps to coordinate with other colors (such as red), thereby avoiding unevenness in the color gamut. The mass percentage of the red phosphor affects the output intensity and purity of red light in the display system. The setting of this proportion aims to ensure that the output of red light is sufficiently saturated and has a high brightness, enhancing the color performance of the red region of the display, especially in the case of high color gamut display requirements, the proportion of red light is crucial. A higher proportion of red phosphor helps to expand the color gamut in the red region of the CIE chromaticity diagram, enabling the display system to present more vivid and pure red light. At the same time, an appropriate proportion can also avoid over-saturation of colors, affecting the overall color gamut balance. The mass proportion of the AB curing encapsulant in the backlight source is directly related to the stability of the encapsulation, optical performance, and thermal management effect. A higher proportion of the AB curing encapsulant can ensure the integrity and durability of the encapsulation structure, while optimizing the light transmittance, reducing light loss, and enhancing the overall light efficiency.

[0068] 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 encapsulant is 55.70%.

[0069] A relatively low mass percentage of the green phosphor means that its contribution to green light is relatively small. This helps to maintain color balance and avoid over-enhancement of green, which may affect the coordination of the overall color gamut. 6.33% of the green phosphor is sufficient to ensure appropriate green output in the RGB color gamut, while not making the green too saturated, maintaining color accuracy and naturalness. This moderate proportion helps to ensure that the green phosphor has a high quantum efficiency under blue light excitation, without causing interference to other light colors.

[0070] The proportion of 37.97% of the red phosphor is relatively high, which can provide a sufficiently strong output of red light for the display system. Red is a very crucial part of color gamut expansion. A higher proportion of red phosphor ensures that the display device can provide rich and saturated colors in the red region. This proportion helps to enhance the color performance of the red region, making the display effect more vivid and realistic.

[0071] A higher content of red phosphor helps to expand the red region in the CIE chromaticity diagram, enhancing the color vividness and saturation of the display. The relatively high proportion of AB curing encapsulant indicates its importance in the overall design. The encapsulant protects the LED chip and phosphor from external environmental factors (such as moisture, dust, heat) that could affect their performance. This ratio ensures the stability of the encapsulation structure, provides strong mechanical protection, and effectively enhances the optical performance.

[0072] In Comparative Example 1, green phosphor BS542G2 and red phosphor ZYPF631B produced by Yuji Co., Ltd. were used, with a formulation ratio of 0.3067 g of green phosphor, 0.8667 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0073] In Comparative Example 2, green phosphor SDNG541ZS1 and red phosphor SDK300ZS2 produced by Shielder Co., Ltd. were used, with a formulation ratio of 0.2857 g of green phosphor, 0.8571 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0074] In Comparative Example 3, this example used green phosphor SDNG537S1 and red phosphor SDK305ZS1 produced by Shielder Co., Ltd., with a formulation ratio of 0.3786 g of green phosphor, 0.8571 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0075] In the preferred embodiment, this example used green phosphor NBG535 and red phosphor KSL-610BH produced by Intematix Corporation, with a formulation ratio of 0.2500 g of green phosphor, 1.5000 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B). The light-emitting semiconductor prepared by this formulation has the following properties: voltage of 3.270 V, current of 184.73 mA, luminous efficiency of 94.16 lm / W, chromaticity coordinates of X = 0.2727, Y = 0.2565, color temperature of 15272 K color gamut, and color gamut of 93.51%.

[0076] In Comparative Example 4, this example used green phosphor SAMPLE A4 and red phosphor GRX40, with a formulation ratio of 0.2800 g of green phosphor, 0.8667 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0077] In Comparative Example 5, this embodiment uses the green phosphor G41D0320 and the red phosphor ZYPF631B produced by Yuji Co., Ltd., and the formulation ratio is 0.2850 g of green phosphor, 0.7000 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0078] In Comparative Example 6, this embodiment uses the green phosphor G41D0220 and the red phosphor R31D0530 produced by Yuji Co., Ltd., and the formulation ratio is 0.2867 g of green phosphor, 0.7600 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0079] In Comparative Example 7, this embodiment uses the green phosphor SDNG534DZ1 and the red phosphor SDK305ZS1 produced by Hilde Co., Ltd., and the formulation ratio is 0.3067 g of green phosphor, 0.8000 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0080] In Comparative Example 8, this embodiment uses the green phosphor SG-540 and the red phosphor 680F-25110-A produced by GRINM, and the formulation ratio is 0.2485 g of green phosphor, 0.7879 g of red phosphor, and 2.2000 g of curing glue (BQ4239A / B).

[0081] By preparing the light-emitting semiconductor through the above preferred examples and embodiments, the parameter summary of the obtained finished products is shown in Table 1.

[0082] Table 1 Parameter summary table of light-emitting semiconductor finished products

[0083]

[0084] It can be concluded from the data in the table that the preferred examples perform relatively excellently in terms of color gamut and luminous efficiency and are 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 they cannot reach the expected color gamut range. Therefore, the preferred examples perform well in the balance of color gamut and color temperature and are a relatively ideal choice.

[0085] Subsequently, the color gamut of the light-emitting semiconductor of the preferred example is targeted to represent the coverage range of different color regions. As Figure 4 shown in the figure, it helps us visually see the distribution of various colors and shows the positions of the colors on the CIE 1931 chromaticity diagram. Each marker (such as EM13, EM12, etc.) represents a specific color region, and these regions represent the color ranges that can be presented on devices such as displays and light sources;

[0086] As Figures 5a-5cAs shown, two tables contain chromaticity coordinate data within the color gamut region. For the data of each color region, from top to bottom are the error-free chromaticity coordinates, upward, downward, leftward, and rightward errors. The error-free chromaticity coordinates are the standard positions of each color gamut region on the chromaticity diagram. The values of upward, downward, leftward, and rightward errors represent the possible offsets of the chromaticity coordinates in different directions. By Figures 4-5c , it can be found that the chromaticity coordinates of the preferred examples are close to the ideal values, and the errors in all four directions are small, indicating that the colors in these regions are relatively stable and suitable for devices with high precision requirements.

[0087] Embodiment 2

[0088] The embodiment of the present invention also provides a preparation method of a high-color-gamut light-emitting semiconductor device for backlight, which is used for any one of the high-color-gamut light-emitting semiconductor devices described in Embodiment 1. The preparation method includes:

[0089] S1. Process the EMC copper substrate to obtain a target substrate. Among them, the target substrate includes a 0.2-mm copper layer and a 100-μm additional copper layer;

[0090] In this step, the EMC copper substrate is processed into a structure suitable for encapsulation. The substrate includes a 0.2-mm-thick copper layer and a 100-μm-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 effect and provides a suitable surface for subsequent welding or gluing.

[0091] S2. Place the LED blue chip in a cup-shaped encapsulation structure, and fix the LED blue chip on the target substrate by means of conductive silver glue or welding;

[0092] The LED blue chip is placed in a cup-shaped encapsulation structure. The cup-shaped structure can concentrate light, making the LED light more concentrated. Then, use conductive silver glue or welding to fix the chip on the target substrate. The conductive silver glue has excellent electrical conductivity, which can ensure the stable transmission of current, and at the same time establish a firm connection between the chip and the substrate, avoiding chip displacement or loosening and ensuring the stability of the device.

[0093] S3. Weigh the red phosphor and the green phosphor according to a first preset ratio and mix them evenly to obtain a mixed phosphor;

[0094] According to the designed light-emitting requirements, weigh the red phosphor and the green phosphor in a preset ratio and mix them evenly. This step ensures that the phosphor combination can emit the expected red light and green light under blue light excitation, thereby achieving high-color gamut output. The design of the preset ratio can affect the final color performance and light efficiency, so accurate weighing and mixing are required to ensure uniform distribution of the phosphors.

[0095] Preferably, weighing the red phosphor and the green phosphor according to the first preset ratio and mixing them evenly to obtain a mixed phosphor includes:

[0096] S31. Divide the particle size range of the red phosphor to obtain two or more first target particle size ranges;

[0097] First, it is necessary to determine the particle size range of the red phosphor, which is completed by measuring the size of the phosphor particles. The particle size division is determined by referring to the particle size distribution diagram or standard, and the phosphor particle size is divided into several categories according to a certain standard. Usually, a suitable particle size range is selected according to the application requirements. In this step, the purpose is to ensure that the particle size of the red phosphor in the subsequent ratio can meet the requirements of the optical effect, and at the same time, it can improve the uniformity and stability of the mixing process. Phosphors with different particle sizes have different contributions to the final light-emitting effect. Finer particles usually can improve the color vividness, while larger particles may affect the light scattering characteristics.

[0098] Through the particle size division, it can be ensured that the phosphors in each particle size range play different roles in the actual mixing, achieving the effect of optimizing their performance. For example, smaller particle size phosphors may have better optical absorption and light-emitting characteristics, while larger particle size phosphors may provide a wider color gamut contribution. The purpose of this step is to lay a good foundation for the subsequent mixing step by optimizing the particle size range of the phosphors and improve the color gamut effect of the final product.

[0099] S32. Screen the red phosphor according to the first target particle size range to obtain target red phosphors belonging to different first target particle size ranges;

[0100] The purpose of this step is to group the red phosphor according to the previously defined particle size range through the screening process, so that the addition amount of the red phosphor in each particle size range can be accurately controlled in the subsequent mixing process. Screening is a commonly used physical separation method, and the red phosphor can be grouped through sieves with different pore sizes. The particle sizes of the screened phosphors are uniform, which helps to ensure that the phosphors of different components in the final mixture can better play their optical characteristics, improve the dispersibility of the phosphors, and reduce the aggregation or precipitation between particles.

[0101] By screening the red phosphor, it can be ensured that red phosphors with different particle sizes can be more evenly distributed in the colloid when mixed with green phosphors, thereby improving the overall luminous efficiency and chromaticity balance of the mixed phosphor. For red phosphors in each particle size range, their 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.

[0102] S33. Divide the target particle size range of the green phosphor to obtain two or more second target particle size ranges;

[0103] Similar to the red phosphor, the particle size range of the green phosphor also needs to be divided. This is because green phosphors with different particle sizes will affect their optical efficiency, chromaticity performance, and uniformity during mixing. Smaller particle size green phosphors can better mix with the colloid and other phosphors, thereby improving the uniformity of the color gamut, while larger particle size green phosphors may affect the optical effect after mixing. Therefore, by dividing the particle size of the green phosphor, its proportion in the final mixed phosphor can be more precisely controlled, thus ensuring the optimization of the final optical performance.

[0104] 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 screening can be carried out within this range. During this process, it is ensured that green phosphors in different particle size ranges can be effectively proportioned and form an ideal combination with the red phosphor in terms of optical properties. S34. Screen the red phosphor according to the second target particle size range to obtain target green phosphors belonging to different second target particle size ranges;

[0105] In this step, the green phosphor will be screened into multiple particle size ranges, which is similar to the screening process of the red phosphor. The purpose of this move is to ensure that green phosphors in each particle size range have a corresponding proportion with the red phosphor during the mixing process, thereby ensuring the uniform distribution of the color gamut. By screening, matching green phosphors with appropriate particle sizes with red phosphors in different particle size ranges can improve their optical properties and avoid optical instability caused by overly large or small particle sizes.

[0106] In the subsequent mixing process, green phosphors in different particle size ranges will play their specific optical roles in the colloid, ensuring that the final mixed phosphor has good luminous efficiency and chromaticity performance. S35. Determine the corresponding relationship between the red phosphor belonging to the first target particle size range and the green phosphor belonging to the second target particle size range according to the difference degree between the first target particle size range and the second target particle size range;

[0107] The purpose of this step is to ensure that the combination of red and green phosphors in different particle size ranges can optimize the mixing effect. Due to the differences in different particle size ranges, red and green phosphors may have different optical responses and scattering effects. For example, larger particle size phosphors may cause higher scattering, affecting the propagation and efficiency of light; smaller particle size phosphors may exhibit better luminous efficiency and uniformity. Therefore, ensuring a reasonable combination of phosphors with a large difference in particle size ranges can minimize inconsistencies and color deviations, ensuring the luminous effect and color performance of the final product.

[0108] The degree of difference can be quantified from the following aspects:

[0109] Particle size difference: First, compare the difference in the particle size ranges of the two phosphors to see if there are obvious deviations. 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 these two powders is relatively large.

[0110] Particle size overlap: In some cases, the particle size ranges of red and green phosphors may partially overlap. For example, the particle size range of the red phosphor is 10 - 20 microns, and the particle size range of the green phosphor is 15 - 25 microns, with the overlapping part being 15 - 20 microns. This overlap can help determine the target matching relationship between them.

[0111] Particle distribution characteristics: The particle size difference may also affect the particle distribution characteristics of the phosphors. If a certain type of phosphor has too large a particle size, it may not be easily and evenly dispersed with other powders during mixing, resulting in uneven distribution of the phosphors and affecting the luminous effect.

[0112] Based on the above information, the corresponding relationship can be determined in the following ways:

[0113] When the particle size ranges of the red and green phosphors overlap more, their mixing effect is better. At this time, the particle size difference between the red and green phosphors is smaller, 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 that of the green phosphor, this may cause uneven dispersion of the particles during mixing, affecting the final luminous effect. Therefore, combinations with too large a particle size difference should be excluded. Even if the particle size difference is small, if the particle distribution is uneven, it may also affect the mixing effect. Therefore, it is necessary to ensure that the selected phosphors have good uniformity in particle distribution to avoid a decrease in luminous efficiency due to poor dispersibility.

[0114] 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 particle size differences on optical performance be reduced, but also the mixing uniformity and stability 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 formulation in subsequent steps, ensuring that the proportion adjustment of each premixed phosphor can achieve a balance between color and luminous efficiency, and ultimately realizing high-quality backlight or display products. S36. According to the corresponding relationship and the first preset ratio, respectively add each of the target red phosphors and the corresponding target green phosphors to a stirring device for premixing to obtain a number of premixed phosphors;

[0115] In this step, the determined corresponding relationship of particle size ranges and the first preset ratio will be applied to the mixing of red and green phosphors. The red phosphors in each target particle size range are paired with the corresponding green phosphors and put into the stirring device for premixing. The purpose of this step is to ensure that during the mixing process, the red and green phosphors can be evenly distributed to guarantee the uniformity and optical performance of the final mixed phosphor. The stirring device needs to ensure uniform mixing to avoid uneven dispersion of particles.

[0116] By reasonably matching the particle size ranges of the red and green phosphors, the luminous efficiency and color gamut range of the premixed phosphor will be effectively optimized. This process helps to maximize the utilization of the optical characteristics 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 for uniform mixing to obtain the mixed phosphor.

[0117] In this step, the second preset ratio is used for the final mixing of the premixed phosphors. By precisely controlling the ratio of various premixed phosphors, it can be ensured that the optical contributions of different phosphors in the final mixture reach a balance. The determination of this ratio is usually based on experimental data, simulation tests, or requirements for target optical performance, which can effectively improve the luminous efficiency and color gamut range of the final light-emitting semiconductor device. The final mixed phosphor will be used to coat the LED blue chip to ensure that it has the required optical performance.

[0118] The effectiveness of this step lies in that it not only makes the final mixture have good optical effects by precisely adjusting the mixing ratio of each phosphor, but also ensures the stability and consistency of the final product.

[0119] In one embodiment, assuming there are only two kinds of premixed phosphors, the second preset ratio can be 1:1, which means the ratio of the two phosphors is equal. Specifically, during the mixing process, these two kinds of premixed phosphors will be added to the stirring device in a ratio of 1:1 for uniform mixing. By setting such a ratio, it is intended to make the two phosphors evenly distributed in the final mixture, thereby ensuring the balance of the final optical properties, avoiding the overdominance of any one party, and further improving the overall luminous efficiency and chromaticity balance.

[0120] When the number of premixed phosphors increases, for example, there are three kinds of premixed phosphors, the second preset ratio can be 1:1:1, which means 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 affect the final optical effect with equal contributions. This ratio helps to ensure the balance of the influence of each phosphor in the final product, thereby avoiding the imbalance of the color gamut or the reduction of the luminous efficiency caused by the excessive use of a certain phosphor.

[0121] This setting is applicable to applications that require balancing the optical properties of each premixed phosphor. Specifically, in the preparation of high-color-gamut light-emitting semiconductor devices for backlighting, the ratio of 1:1:1 helps to fully utilize the advantages of each premixed phosphor, and can maintain an appropriate ratio among multiple phosphors to optimize the final optical properties. Preferably, according to the second preset ratio, the premixed phosphors are sequentially added to the stirring device for uniform mixing to obtain the mixed phosphor, including:

[0122] S371. Perform optical characteristic tests on each of the premixed phosphors according to preset excitation conditions to obtain a first test result, where the first test result at least includes luminous efficiency, chromaticity coordinates, and color rendering index;

[0123] In step S371, the preset excitation conditions refer to performing optical characteristic tests in a certain experimental environment. These 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, avoiding performance changes caused by environmental fluctuations. During the test process, 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 emission, and the color rendering index indicates the ability of the light source to restore the color of an object. In actual operation, a fluorescence spectrophotometer or a high-precision color difference instrument is used to strictly test each premixed phosphor and record the relevant data. The test results provide a basis for determining the target premixed phosphor and its initial proportion.

[0124] S372. Perform a one-way analysis of variance on each of the first test results to obtain the one-way analysis of variance result;

[0125] In step S372, the one-way analysis of variance method is used 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 differences in the performance of 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 performances under specific conditions, and these differences need to be further considered for optimization adjustment during formulation. In the specific implementation process, statistical software such as SPSS or the R language is used to perform the analysis of variance. By calculating the variance between different phosphors, it is determined which ones have significant differences, so as to identify which premixed phosphors should be used as target premixed phosphors for subsequent formulation optimization.

[0126] S373. Judge whether there are significant differences between each of the premixed phosphors according to the one-way analysis of variance result;

[0127] In step S373, according to the one-way analysis of variance result in S372, it is judged whether there are significant differences. If the analysis result shows that there are significant differences in the optical characteristics between some premixed phosphors, these differences are sufficient to affect the performance of the final product, so 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 optimize its proportion or be replaced. The key to this step is to judge which phosphors have sufficiently different performance manifestations based on the statistical results of the analysis of variance, so as to be able to serve as candidates for further formulation. This determination will provide a basis for the next step of proportion determination and mixing strategy.

[0128] S374. If so, use the premixed phosphors with significant differences as target premixed phosphors;

[0129] In this step, the selection of target phosphors is based on their differences and optimization potential shown in the optical performance test. For example, in the implementation process, by recording the performance data of each premixed phosphor, it is clear which phosphors are selected for subsequent proportion adjustment and mixing optimization.

[0130] S375. Analyze the first test results of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor;

[0131] In step S375, the first test results of each target premixed phosphor are analyzed 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 parameters such as experimental data, color gamut requirements, and color rendering index. This process usually involves a comprehensive evaluation of optical properties. By analyzing the luminous efficiency, chromaticity coordinates, and color rendering index of each target phosphor, its contribution to the overall optical effect during mixing is evaluated. For example, if a certain premixed phosphor has a high luminous efficiency, its proportion can be appropriately increased, and vice versa. During specific implementation, a chromaticity diagram and a 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.

[0132] S376. Determine a first preset number of initial proportion combinations within the initial proportion range, where the first preset number is positively correlated with the number of target premixed phosphors, and each 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;

[0133] This step examines the influence of different ratios of each phosphor on the final optical effect by setting multiple initial proportion combinations. The purpose is to ensure that different proportion 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 proportion or adopting algorithm optimization strategies, to ensure the diversity of the proportion combinations, so as to verify the target ratio scheme through experiments later. The beneficial effect of this step is that after verifying different combinations through experiments, the premixed phosphor combination with the least impact on optical performance and good effect can be locked.

[0134] The first preset number is the number of proportion combinations designed during mixing optimization. The fact that the setting of the first preset number is positively correlated with the number of target premixed phosphors means that the more target premixed phosphors there are, the more proportion combinations of the first preset number will be correspondingly increased. This is because more target premixed phosphors require more proportion combinations for comprehensive testing and optimization. By increasing the number of proportion combinations, it can be ensured that the optimal scheme is tested and selected under more ratio combinations. Generally, the first preset number will be set to several times the number of target premixed phosphors to ensure full exploration of various possible ratios.

[0135] The proportions of at least two target premixed phosphors are different in different proportion combinations, mainly to test the interaction of different phosphors during mixing and its influence on the optical performance of the final product. If the proportions of all premixed phosphors are the same in each proportion combination, then the performance of each phosphor cannot be comprehensively evaluated.

[0136] S377. Mix the target premixed phosphor according to each of the said proportion combinations to obtain the first preset quantity of initial mixed phosphors;

[0137] The purpose of this step is to verify the influence of different ratios on the final optical performance. By using a stirring device, ensure that each premixed phosphor can be evenly distributed, avoiding unstable optical effects caused by uneven dispersion. During implementation, the ratio is operated according to the set initial proportion, and by precisely controlling the mixing process, ensure that the composition of the mixed phosphor prepared each time is consistent. The beneficial effect of this step is that by verifying different proportion combinations, the specific influence of each premixed phosphor on the optical effect after mixing can be accurately understood.

[0138] S378. Conduct optical property tests on each of the said initial mixed phosphors according to the preset excitation conditions to obtain a second test result, where the second test result includes luminous efficiency, chromaticity coordinates, and color rendering index;

[0139] The purpose of this stage is to verify the optical performance of the initial mixed phosphors through further test data. The test contents include luminous efficiency, chromaticity coordinates, color rendering index, etc., to ensure that the performance of each phosphor after each ratio meets the expectations. In actual operation, precision equipment such as a fluorescence spectrophotometer and a color difference meter can be used for measurement to ensure the accuracy of the data. Through this test, the ratio combinations with the most suitable optical performance can be further screened out.

[0140] S379. Perform weighted calculation on the second test result according to a preset weight to obtain a first score for each initial mixed phosphor;

[0141] In step S379, perform weighted calculation on the second test result according to a preset weight to obtain a first score for each initial mixed phosphor. The purpose of this process is to calculate the comprehensive score of each ratio by comprehensively evaluating the various performances of each ratio, and further select the optimal ratio scheme according to the scores. Different weights can be assigned to each performance such as luminous efficiency, chromaticity coordinates, color rendering index, etc., to reflect its importance in a specific application. Through weighted calculation, the ratio combinations of phosphors with the best performance can be screened out, providing a basis for subsequent optimization and adjustment.

[0142] In this embodiment, the preset weight is set according to the target application requirements. Different backlight systems or light source applications have different requirements for different optical characteristics. For example, the backlight system of a TV or a monitor may pay more attention to color gamut coverage and color rendering, while general lighting may pay more attention to luminous efficiency and color rendering index. For applications that need to emphasize color gamut coverage and color accuracy (such as monitors, projectors, etc.), the weights of chromaticity coordinates and color rendering index can be increased, and the weights of chromaticity coordinates and color rendering index may be set to 60%-70%, while the weight of luminous efficiency is appropriately reduced. S3710. Narrow down the initial ratio range according to the initial ratio combination with the highest first score to obtain the target ratio range;

[0143] Step S3710 further restricts the initial ratio range according to the initial ratio combination with the highest first score to obtain the target ratio range. The purpose of this stage is to further narrow down the optimization space and lock in the most potential ratio scheme based on the previous tests. By restricting the ratio range, the stability of the optical effect can be further improved, and the problem of unstable optical performance caused by excessive adjustment can be avoided. The beneficial effect of this step is to find the target ratio interval through comparative analysis, providing data support for the next optimization adjustment.

[0144] S3711. Determine a second preset number of intermediate ratio combinations within the target ratio range, where the second preset number is less than or equal to the first preset number;

[0145] Step S3711 determines a second preset number of intermediate ratio combinations within the target ratio range. The purpose of this stage is to further optimize the ratio result by refining the ratio. According to the test and analysis results of the first round, new ratio combinations are 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.

[0146] The second preset number refers to the number of ratio combinations determined after more refined selection based on the preliminary test results (i.e., the first test result and the second test result). That is, on the basis of the first preset number, a smaller range of ratio combinations is obtained through the first round of optimization (including scoring and narrowing down), and finally the most potential ratio combinations are selected for the second round of testing.

[0147] By exploring a large number of ratio combinations in the first stage, different possibilities can be comprehensively covered, while in the second stage, by refining and selecting the optimal combination, redundant tests are reduced and the optimization efficiency is improved. The setting of the second preset number helps to further refine the ratio configuration. Through the second round of testing, the final optimal ratio combination can be found more accurately, and the optical performance and color gamut coverage can be further improved.

[0148] S3712. Mix the target premixed phosphor according to each of the intermediate proportion combinations to obtain the second preset quantity of intermediate mixed phosphors;

[0149] In step S3712, the target premixed phosphor is mixed according to the intermediate proportion combinations to obtain the second preset quantity of intermediate mixed phosphors. This process will mix the target phosphor according to a more detailed ratio, thereby achieving more precise optical performance regulation. Through this step, more ratio combinations can be obtained to further verify which proportion combinations contribute better to the optical performance.

[0150] S3713. Test the optical characteristics of each of the intermediate mixed phosphors according to the preset excitation conditions to obtain the third test result;

[0151] In step S3713, the optical characteristics of each intermediate mixed phosphor are tested again according to the preset excitation conditions to obtain the third test result. The purpose of this step is to verify the optical performance of the intermediate proportion combinations and further optimize the ratio scheme.

[0152] S3714. Perform weighted calculation on the second test result according to the preset weight to obtain the second score of each intermediate mixed phosphor;

[0153] In step S3714, a weighted calculation is performed on the third test result to obtain the second score of each intermediate mixed phosphor. Through the scoring at this stage, the contributions of different proportion combinations to the optical effect can be comprehensively evaluated, providing a basis for finally selecting the target ratio scheme.

[0154] S3715. Determine the second preset ratio according to the intermediate proportion combination corresponding to the intermediate mixed phosphor with the highest second score;

[0155] In step S3715, the second preset ratio is determined according to the intermediate proportion combination corresponding to the intermediate mixed phosphor with the highest second score. The goal of this step is to finally confirm the optimal proportion according to the intermediate scoring results, ensuring that the final product has good optical effects.

[0156] S3716. Add the premixed phosphor to a stirring device and mix it evenly according to the second preset ratio to obtain the mixed phosphor.

[0157] In step S3716, the premixed phosphor is added to a stirring device and evenly mixed 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.

[0158] Preferably, analyzing the first test results of each target premixed phosphor to determine the initial proportion range of each target premixed phosphor in the mixed phosphor includes:

[0159] S3751. Draw the color coverage range of each target premixed phosphor according to the chromaticity coordinates of each target premixed phosphor in the first test results;

[0160] Specifically, the chromaticity coordinates refer to the coordinates representing the color of a light source, usually represented based on a chromaticity diagram. The chromaticity coordinates of each light source or phosphor determine the range and accuracy of its emitted light color. The color coverage range is the variable range representing the emitted light color of each phosphor on the chromaticity coordinate diagram. This range can be obtained through experimental data or simulation models. By experimentally testing the chromaticity coordinates of each target premixed phosphor under specific excitation conditions, the coverage areas of them in the chromaticity diagram are drawn. 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 ranges due to their different light-emitting characteristics. By drawing the color coverage range, basic data can be provided for subsequent chromaticity adjustment. These data help determine which phosphors can contribute to a specific color gamut area and provide a direction for optimizing the color output.

[0161] S3752. Perform weighted averaging on all chromaticity coordinate points of the color coverage range to obtain the chromaticity centroid position of each premixed phosphor;

[0162] Specifically, the chromaticity centroid refers to the weighted average position of all chromaticity coordinate points within the color coverage range, similar to the geometric centroid, representing the center position of the color gamut. By performing 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. Perform weighted averaging on all points within the chromaticity coordinate coverage range of each premixed phosphor. The weight of each chromaticity coordinate point can be assigned based on its position distribution density or its importance to obtain 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 the match with the target color gamut.

[0163] S3753. Perform weighted averaging on all chromaticity coordinate points within the preset target color gamut to obtain the target centroid position;

[0164] Specifically, the target color gamut refers to the ideal color range preset according to product requirements (such as display devices, lighting devices, 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 required final color balance and optimization target are determined, serving as the standard for comparison with the chromaticity centroids of each phosphor. The target centroid provides a reference for the difference in centroids between each premixed phosphor, helping to identify and quantify the deviation of different phosphors from the color gamut, thereby achieving precise color mixing.

[0165] S3754. Determine the centroid gap of each premixed phosphor according to the Euclidean distance between the chromaticity centroid position and the target centroid position;

[0166] Specifically, the Euclidean distance is the straight-line distance between two points in the chromaticity diagram, representing the difference between 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 chromaticity of the premixed phosphor and the target color gamut. Calculate the gap between the centroid of each premixed phosphor and the target centroid to determine its deviation from the target color gamut and provide a basis for adjusting the proportion. The calculation of the centroid gap provides a quantitative basis for color optimization, clearly showing which phosphors contribute more to the color gamut and which need further adjustment.

[0167] S3755. Determine the upper limit value of the initial proportion range of each premixed phosphor according to the centroid gap, where the centroid gap is negatively correlated with the upper limit value;

[0168] Specifically, according to the negative correlation between the centroid gap and the upper limit value, determine the initial proportion upper limit of each phosphor. 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. Therefore, too high a proportion cannot be used, otherwise the deviation between the overall mixed color and the target color gamut will increase. To keep the color of the final mixture close to the target color gamut, restrictions need to be placed on the proportion of these phosphors. Therefore, the larger the centroid gap, the smaller the proportion upper limit of the premixed phosphor. S3756. Determine the minimum effective proportion according to the luminous efficiency of each target premixed phosphor;

[0169] For each premixed phosphor, its minimum effective proportion in the mixed phosphor can be calculated to enable it to contribute sufficient luminous efficiency. For example, for a phosphor with a relatively low luminous efficiency, its lower proportion limit may need to be relatively high to ensure that it can emit light effectively and contribute to the brightness. This step sets the minimum proportion of each premixed phosphor according to its luminous efficiency. This proportion generally needs to ensure that the luminous ability of each phosphor can meet the brightness requirements while avoiding color distortion caused by too low a proportion.

[0170] In one embodiment, for a phosphor with a wider chromaticity range or a higher luminous efficiency, the lower proportion limit can be appropriately reduced. For a phosphor with a lower luminous efficiency, its lower proportion limit must be increased to ensure that it can provide sufficient light output.

[0171] S3757. Adjust the minimum effective proportion according to the centroid gap to determine the lower limit value of the initial proportion range of each premixed phosphor, where the centroid gap is positively correlated with the lower limit value.

[0172] Specifically, adjust the minimum proportion of each premixed phosphor 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 sufficient light output. By adjusting the lower limit value, it can be ensured that the minimum proportion of each phosphor is sufficient to guarantee the luminous effect while avoiding excessive color gamut deviation. This helps to improve the flexibility and accuracy of color optimization.

[0173] 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.

[0174] Combine the upper limit value and the lower limit value to determine the proportion range of each phosphor in the mixture. Through multiple optimization adjustments, ensure that the final proportion can minimize the chromaticity gap on the premise of meeting the luminous efficiency, achieving an ideal color effect.

[0175] 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 chromaticity centroid of the target color gamut. Finally, the Euclidean distance is calculated to quantify this difference, and then the proportion of the phosphor is optimized to minimize the gap with the target color gamut as much as possible. This process ensures that the contributions of different phosphors to the color gamut are precisely controlled, avoids excessive color deviation from the target, and maintains color consistency and accuracy. 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 combining the adjustment of the minimum proportion based on the centroid difference (in S3757), the contributions of each phosphor in the mixture can be balanced. For phosphors with lower luminous efficiency, although their contribution to color is small, it is still necessary to ensure that their luminous effect will not be weakened too much. Therefore, setting the minimum effective proportion can ensure that low-efficiency phosphors can still provide sufficient brightness, and at the same time, by adjusting the lower limit of the proportion, it is avoided that their light output is too low to affect the overall effect.

[0176] By calculating the centroid difference and chromaticity coordinates, it is ensured that the color output of each phosphor is close to the target color gamut, avoiding color distortion. By setting the minimum effective proportion and flexibly adjusting the proportion range, the balance of luminous efficiency is guaranteed without affecting the brightness.

[0177] S4. Slowly add the mixed phosphor into the AB curing encapsulant, and continue stirring to ensure that the phosphor is evenly distributed in the colloid, obtaining a mixed colloid.

[0178] Slowly add the well-mixed phosphor into the AB-type curing encapsulant and stir evenly. The AB glue is a two-component encapsulating material that can provide good protection and sealing performance, and at the same time has good optical transparency. The evenly 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 light emission.

[0179] S5. Coat the surface of the LED blue chip with the mixed colloid, and cure it under preset temperature and humidity conditions. After a preset time, a target light-emitting semiconductor device is obtained.

[0180] Evenly coat the mixed colloid on the surface of the LED blue chip, so that the light emitted by the blue chip can evenly excite the phosphor. Then, cure it under 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 light-emitting characteristics is obtained.

[0181] Preferably, after coating the mixed colloid on the surface of the LED blue chip and curing it under preset temperature and humidity conditions to obtain the high-color gamut light-emitting semiconductor device for backlight after a preset time, the method further includes:

[0182] Connect the target light-emitting semiconductor device to a power supply, and use an electrical parameter tester to detect its operating current and operating voltage;

[0183] Connect the target light-emitting semiconductor device to a power supply, and use an electrical parameter tester to detect its operating current and operating voltage. This step is mainly to confirm that the device works normally under rated voltage and current, and ensure that the current-voltage characteristics meet the design requirements. The tests of current and voltage are very important for subsequent performance evaluation and safety tests.

[0184] Place the target light-emitting semiconductor device in an integrating sphere, and use an integrating sphere photometer to measure the luminous flux after power-on;

[0185] Place the target light-emitting semiconductor device in an integrating sphere, and use an integrating sphere photometer to measure the luminous flux after power-on. The integrating sphere is a commonly used 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. The luminous flux is an important indicator to measure the luminous intensity of a light source and ensure that it meets the designed brightness requirements.

[0186] Use a spectral analyzer to measure the spectral distribution and color rendering index of the target light-emitting semiconductor device;

[0187] Use a spectral 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 and help understand the color characteristics of the device's light emission; the color rendering index reflects the ability of the device to truly restore the colors of objects and is a key parameter for evaluating the quality of a light source.

[0188] Obtain the chromaticity coordinates and color temperature of the target light-emitting semiconductor according to the spectral distribution;

[0189] Calculate the chromaticity coordinates and color temperature of the target light-emitting semiconductor device based on the measured spectral distribution data. The chromaticity coordinates represent the color position of the device's light emission and are used to quantify its color performance; the color temperature is used to describe whether the hue of the light source is cooler or warmer and is usually applicable to the evaluation of visual comfort and color effects.

[0190] Place the target light-emitting semiconductor device in a constant current environment, and test the change of chromaticity coordinates of its light emission over time after power-on to obtain the color shift;

[0191] Place the target light-emitting semiconductor device in a constant current environment. After power-on, test the change of its chromaticity coordinates with time during light emission to obtain color shift data. The color shift test is to detect whether the emitted light color of the device shifts during long-term operation, so as to evaluate its stability. Devices with smaller color shifts can maintain color consistency during long-term use and are suitable for high-demand backlight applications.

[0192] Based on the working voltage, working current, luminous flux, chromaticity coordinates, color rendering index, color temperature, and color shift, determine whether the target light-emitting semiconductor device meets the preset optoelectronic test conditions;

[0193] Based on key parameters such as working voltage, working current, luminous flux, chromaticity coordinates, color rendering index, color temperature, and color shift, determine whether the target light-emitting semiconductor device meets the preset optoelectronic test conditions. The preset conditions are formulated according to application requirements, and only devices that meet these standards are considered qualified.

[0194] If it meets the requirements, package and ship the target light-emitting semiconductor device.

[0195] If the target light-emitting semiconductor device meets all optoelectronic performance requirements, it will be packaged and prepared for shipment. This step ensures that the shipped devices have reliable performance and meet the actual needs of customers.

[0196] In a specific embodiment, the measured average voltage is 3.270 V. This means that under standard test conditions, the working voltage of the LED in the control group is 3.270 volts, which is within the normal range and close to the voltage values of other specimen groups. The average luminous flux is 184.73 lm. The luminous flux represents the total amount of light emitted by the light source per unit time, and the value of 184.73 lumens is relatively high. The average luminous efficacy is 94.16 lm / W. The luminous efficacy refers to the luminous flux converted from each watt of electric power. The luminous efficacy of the control group is lower than 100 lm / W. The chromaticity coordinates are X: 0.2727 and Y: 0.2565. These values are used to define the chromaticity position of the light source in the control group. The color temperature is 15272 K, and the gamut value of 93.51 indicates that there is no significant change in the luminous flux during the test, and the light source has good stability. In this specific embodiment, the gamut target diagram of the target light-emitting semiconductor device is as Figure 4 shown Figure 4Each marker (such as EM13, EM12, etc.) in it represents a specific color region, which indicates the color range that can be presented on devices such as displays and light sources. It has a wide gamut coverage rate and can present a rich and accurate color range. Different color regions in the gamut target map indicate that the device can achieve accurate light emission at different color coordinates, showing a high gamut coverage rate, good color accuracy, stability, and fine spectral control ability, and is suitable for high-precision display scenarios. By adjusting the driving parameters, color tuning can be further achieved, which has broad application potential, including high-end displays, outdoor screens, and scenarios that require accurate color reproduction.

[0197] In summary, the beneficial effects of the present invention are as follows:

[0198] The high-gamut light-emitting semiconductor device for backlight and its preparation method provided by the embodiments of the present invention can achieve the maximum coverage of the gamut by selecting a blue light chip with a wavelength range of 440 - 470 nm and controlling the peak wavelength of the green phosphor to be 525 - 545 nm and the peak wavelength of the red phosphor to be 625 - 635 nm. This spectral distribution can effectively enhance the purity of the three primary colors of red, green, and blue, enabling the display device to have a wider gamut range, thereby significantly improving color reducibility and realism. Due to the selection of a combination of an efficient blue light LED chip and a phosphor with a high quantum yield, the overall light-emitting efficiency is improved, reducing energy loss. At the same time, due to the high light conversion efficiency of the phosphor, the power consumption is effectively controlled on the premise of providing sufficient brightness, which helps to save energy. By strictly controlling the wavelength range of the phosphor, the light output in each wavelength region is more stable and uniform. This can effectively reduce the color deviation problem, enabling the image to maintain a consistent color performance at different angles and brightness levels, and enhancing the uniformity and consistency of the image. In summary, through precise regulation of the wavelength distribution of the chip and the phosphor, the present invention not only improves the gamut coverage rate of the light-emitting semiconductor device but also takes into account high brightness, low power consumption, and consistent color performance, and has excellent application prospects.

[0199] It should be clear that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, the detailed description of known methods 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. Those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present invention.

[0200] It should also be noted that in the exemplary embodiments mentioned in the present invention, some methods or systems are described based on a series of steps or devices. However, the present invention is not limited to the order of the above steps. That is to say, the steps can be executed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps can be executed simultaneously.

[0201] As described above, the above is only the specific implementation manner of the present invention. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, modules, and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A method for preparing a high color gamut light-emitting semiconductor device for backlight, characterized in that: The light-emitting semiconductor device includes an LED blue light chip; Phosphors include green phosphors and red phosphors, wherein the peak wavelength of the green phosphors is within a first wavelength range of 525-545 nm, and the peak wavelength of the red phosphors is within a second wavelength range of 625-635 nm; the main wavelength of the LED blue light chip is within a third wavelength range of 440-470 nm, and the preparation method includes: 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; The red phosphor and the green phosphor are weighed according to a first preset ratio and 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 green 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 a second preset ratio, the premixed phosphor is sequentially added into a stirring device and evenly mixed to obtain the 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.

2. The method for preparing a 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 method for preparing a 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 method for preparing a 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 method for preparing a 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. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 1, 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.

7. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 1, 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; 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; 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.

8. The method for preparing a high color gamut light-emitting semiconductor device for backlighting according to claim 7, 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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