Ultrahigh color gamut backlight module based on blue-green light chip

Abstract

The invention discloses an ultra-high color gamut backlight module based on a blue-green light chip. The ultra-high color gamut backlight module comprises the blue-green light chip and fluorescent glue. The preparation method of the fluorescent glue comprises the following steps: dispersing red fluorescent powder in an organic solvent, pouring into packaging glue, fully mixing, and removing the organic solvent to obtain the fluorescent glue. The prepared red fluorescent powder is good in chemical stability, the suitable excitation light wavelength of the red fluorescent powder covers blue light of 440-470 nm and green light of 520-560 nm, under the excitation of the blue light and the green light in the range, the red fluorescent powder has very strong fluorescence emission in a red light area, the emission peak wavelength is adjustable in the range of 620-650 nm, the wavelength half-wave width of three primary colors is about 30 nm, and the red fluorescent powder can be widely applied to the field of light emitting devices. The red fluorescent powder is very suitable for being used as a white light LED excited by blue and green light.

Description

Technical Field

[0001] The present invention relates to the technical field of backlight modules, and in particular to an ultra-high color gamut backlight module based on a blue-green light chip. Background Art

[0002] In the field of liquid crystal display, liquid crystal molecules themselves do not have the ability to emit light, so they need to rely on external light sources to achieve display effects. Currently, the most commonly used light source is the light-emitting diode (LED), which transforms point light sources into surface light sources through the diffusion and uniform light effects of the backlight module, providing uniform lighting.

[0003] In LCD monitors, the traditional backlight configuration mainly uses blue LED chips with yellow phosphor (YAG phosphor) for light emission. This combination can effectively produce white light and achieve basic color gamut coverage, but there are still certain limitations in color performance. As users' demand for display effects and color accuracy increases, the industry is gradually turning to solutions with higher color gamuts.

[0004] In order to meet the demand for high color gamut coverage, the industry has gradually introduced fluorescent materials with narrow half-wave width, such as fluoride phosphors and quantum dot phosphors. These new fluorescent materials can provide higher color saturation and more accurate color reproduction. Their unique physical properties enable them to have better spectral distribution in different wavelength ranges, thereby enhancing the overall color gamut performance of the backlight source.

[0005] Fluoride phosphors usually have a narrow emission spectrum and can produce efficient light output at specific wavelengths. These phosphors are often used in green and red emission layers, especially in the light source configuration of liquid crystal displays. They can significantly improve the color saturation of green and red, ensuring the vividness and realism of the imaging. Quantum dots are a nanoscale material that can release light of different wavelengths by adjusting its size and shape. The use of quantum dot phosphors can achieve a wider color gamut coverage, especially for high-end display products. Compared with traditional phosphors, quantum dot phosphors have higher luminous efficiency and a purer spectrum, which can effectively improve the color reproduction ability of liquid crystal displays and meet the needs of HDR (high dynamic range) display.

[0006] In order to develop an efficient phosphor, scientific research institutions around the world are investing huge manpower and material resources, and have achieved some important research results. 3+ Or Eu 2+ Activated sulfide, nitride and silicate phosphors. Sulfides such as (Ca 1-x Sr)S:Eu 2+Red fluorescent materials, but sulfides are unstable and easily decomposed at high temperatures to produce toxic substances. The white light LEDs prepared have a short life and do not meet environmental protection requirements. Nitrides such as Sr 2 Si 5 N 8 :Eu 2+ and CaAlSiN 3 :Eu 2+ Red fluorescent materials such as SrO2 have good fluorescent properties, but the synthesis conditions are relatively harsh, the synthesis cost is high, the alkaline earth metal nitrides in the raw materials are easy to react with air and water vapor, the preparation process is complicated, the powder purity is low, and it cannot be mass-produced at present. 3 SiO 5 Yellow or orange-yellow phosphors (see US Patent US20070029526A1), although this type of phosphor has the characteristics of cheap and easy-to-obtain raw materials and lower burning temperature than the aluminate system, its chemical and thermal stability are poor, which limits its application in pc-WLEDs. Summary of the invention

[0007] In view of the deficiencies in the prior art, an object of the present invention is to provide an ultra-high color gamut backlight module based on a blue-green light chip.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme: A super-high color gamut backlight module based on a blue-green light chip, the super-high color gamut backlight module comprising a blue-green light chip and fluorescent glue; wherein the fluorescent glue is prepared by dispersing red fluorescent powder in an organic solvent, then pouring the mixture into packaging glue, mixing the mixture thoroughly, and removing the organic solvent to obtain the fluorescent glue.

[0009] Specifically, the preparation method of the red phosphor is as follows: S1. Add lithium nitrate, aluminum nitrate, molybdenum nitrate, manganese nitrate and nano titanium dioxide into deionized water, stir evenly, then drop oxalic acid solution therein, stir at 60-80° C. for 1-3 hours, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere, cooling it to room temperature after calcination, crushing and sieving it to obtain a sintered body; S3, adding the obtained sintered body and vinyl silane coupling agent into an ethanol aqueous solution, stirring for 1-3 hours, and then filtering, washing and drying to obtain a modified sintered body; S4, dispersing the modified sintered body in an organic solvent, then adding trifluoromethylstyrene and an initiator thereto, heating and stirring to react, and after the reaction is completed, filtering, washing and drying to obtain a red phosphor.

[0010] Specifically, in step S1, the mass ratio of lithium nitrate, aluminum nitrate, molybdenum nitrate, manganese nitrate and nano titanium dioxide is 1-3:2-3:2-3:2-4:4-8.

[0011] Specifically, in step S1, the concentration of the oxalic acid solution is 0.5-2mol / L. In some embodiments of the present invention, for example, 0.5mol / L, 1mol / L, 1.5mol / L, and 2mol / L can be selected; the dripping rate of the oxalic acid solution is 1-2mL / min. For example, 1mL / min, 1.2mL / min, 1.4mL / min, 1.5mL / min, 1.6mL / min, 1.8mL / min, and 2mL / min can be selected; but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0012] Specifically, in step S2, the calcination temperature is 1100-1400°C. In some embodiments of the present invention, for example, 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C, and 1400°C can be selected; the calcination time is 3-6h, for example, 3h, 4h, 5h, and 6h can be selected; but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0013] Specifically, in step S3, the mass ratio of the sintered body and the vinyl silane coupling agent is 8-10:1-2. In some embodiments of the present invention, for example, 8:1, 8:1.5, 8:2, 9:1, 9:1.5, 9:2, 10:1, 10:2 can be selected; but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0014] More specifically, the vinyl silane coupling agent is selected from vinyl trimethoxy silane or vinyl triethoxy silane.

[0015] Specifically, in step S4, the mass ratio of the modified sintered body, p-trifluoromethylstyrene and the initiator is 8-12:4-6:0.5-1.

[0016] More specifically, the initiator is selected from benzoyl peroxide or dicumyl peroxide.

[0017] Specifically, in step S4, the temperature of the heating and stirring reaction is 50-55°C. In some embodiments of the present invention, for example, 50°C, 51°C, 52°C, 53°C, 54°C, and 55°C can be selected; the time of the heating and stirring reaction is 3-5h. In some embodiments of the present invention, for example, 3h, 3.5h, 4h, 4.5h, and 5h can be selected; but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The red phosphor prepared by the present invention has good chemical stability. Its suitable excitation light wavelength covers the blue light of 440 to 470 nm and the green light of 520 to 560 nm. Under the excitation of blue-green light in this range, it has strong fluorescence emission in the red light region. The emission peak wavelength is adjustable in the range of 620 to 650 nm. The half-wave width of the wavelengths of the three primary colors is about 30 nm. It is very suitable as a red phosphor for white light LEDs excited by blue-green light.

[0019] (2) The red phosphor prepared by the present invention does not use precious raw materials such as rare earths. The raw materials are abundant and low in cost. Compared with other red phosphors using halides as matrix materials, the preparation process of the matrix material of the present invention is simple, the product is easy to collect, and the cost is low.

[0020] (3) The red phosphor prepared by the present invention is coated with a trifluoromethylstyrene polymer on the surface of the red phosphor through a double bond addition reaction. The hydrophobic effect of the trifluoromethylstyrene polymer can effectively isolate water vapor and avoid hydrolysis of the red phosphor. The red phosphor can remain stable for a long time in a humid environment, thereby extending the service life of the red phosphor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a five-sided CSP backlight source provided by the present invention; Figure 2 A schematic diagram of the structure of a single-sided CSP backlight source provided by the present invention; Figure 3 This is a schematic diagram of the structure of the blue-green light flip chip provided by the present invention; Figure 4 This is a schematic diagram of the structure of the blue-green light front-mounted chip provided by the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0023] It should be noted that, unless otherwise specified, the chemical reagents involved in the present invention were purchased through commercial channels.

[0024] The particle size of the nano titanium dioxide used in the embodiment of the present invention is 40-60 nm.

[0025] Example 1

[0026] A method for preparing red phosphor comprises the following steps: S1. Add 1g lithium nitrate, 2g aluminum nitrate, 2g molybdenum nitrate, 3g manganese nitrate and 5g nano titanium dioxide into 100mL deionized water, stir evenly, then add 10mL of 1mol / L oxalic acid solution dropwise thereto at a dropping rate of 1mL / min, stir at 60°C for 3h, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere at a calcination temperature of 1100° C. for 6 h, cooling to room temperature after calcination, and crushing through an 800-mesh sieve to obtain a sintered body; S3, adding 8 g of the sintered body and 1 g of vinyltrimethoxysilane into 100 mL of 80 wt% ethanol aqueous solution, stirring for 2 h, and then filtering, washing, and drying to obtain a modified sintered body; S4. Disperse 8 g of the modified sintered body in 100 mL of organic solvent DMF, then add 4 g of p-trifluoromethylstyrene and 0.5 g of initiator benzoyl peroxide, heat and stir at 50°C for 5 h, and after the reaction is completed, filter, wash and dry to obtain a red phosphor.

[0027] Example 2

[0028] A method for preparing red phosphor comprises the following steps: S1. Add 3g lithium nitrate, 2g aluminum nitrate, 3g molybdenum nitrate, 4g manganese nitrate and 8g nano titanium dioxide into 100mL deionized water, stir evenly, then add 10mL of 1mol / L oxalic acid solution dropwise thereto at a dropping rate of 2mL / min, stir at 80°C for 1h, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere at a calcination temperature of 1400° C. for 3 h, cooling to room temperature after calcination, and crushing through an 800-mesh sieve to obtain a sintered body; S3, adding 10 g of the sintered body and 2 g of vinyltrimethoxysilane into 100 mL of 80 wt% ethanol aqueous solution, stirring for 2 h, and then filtering, washing, and drying to obtain a modified sintered body; S4. Disperse 12 g of the modified sintered body in 100 mL of organic solvent DMF, then add 6 g of p-trifluoromethylstyrene and 1 g of initiator benzoyl peroxide, heat and stir at 55°C for 3 h, and after the reaction is completed, filter, wash and dry to obtain a red phosphor.

[0029] Example 3

[0030] A method for preparing red phosphor comprises the following steps: S1. Add 1g lithium nitrate, 3g aluminum nitrate, 2g molybdenum nitrate, 2g manganese nitrate and 4g nano titanium dioxide into 100mL deionized water, stir evenly, then add 10mL of 1mol / L oxalic acid solution dropwise thereto at a dropping rate of 1.5mL / min, stir at 70°C for 2h, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere at a calcination temperature of 1200° C. for 5 h, cooling to room temperature after calcination, and crushing through an 800-mesh sieve to obtain a sintered body; S3, adding 9 g of the sintered body and 1.5 g of vinyltrimethoxysilane into 100 mL of 80 wt% ethanol aqueous solution, stirring for 2 h, then filtering, washing, and drying to obtain a modified sintered body; S4. Disperse 10 g of the modified sintered body in 100 mL of organic solvent DMF, then add 5 g of p-trifluoromethylstyrene and 0.8 g of initiator benzoyl peroxide, heat and stir at 55°C for 3 h, and after the reaction is completed, filter, wash and dry to obtain a red phosphor.

[0031] Comparative Example 1

[0032] A method for preparing red phosphor comprises the following steps: S1. Add 2g aluminum nitrate, 2g molybdenum nitrate, 3g manganese nitrate and 5g nano titanium dioxide into 100mL deionized water, stir evenly, then add 10mL of 1mol / L oxalic acid solution dropwise thereto at a dropping rate of 1mL / min, stir at 60°C for 3h, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere at a calcination temperature of 1100° C. for 6 h, cooling to room temperature after calcination, and crushing through an 800-mesh sieve to obtain a sintered body; S3, adding 8 g of the sintered body and 1 g of vinyltrimethoxysilane into 100 mL of 80 wt% ethanol aqueous solution, stirring for 2 h, and then filtering, washing, and drying to obtain a modified sintered body; S4. Disperse 8 g of the modified sintered body in 100 mL of organic solvent DMF, then add 4 g of p-trifluoromethylstyrene and 0.5 g of initiator benzoyl peroxide, heat and stir at 50°C for 5 h, and after the reaction is completed, filter, wash and dry to obtain a red phosphor.

[0033] Compared with Example 1, Comparative Example 1 did not add lithium nitrate.

[0034] Comparative Example 2

[0035] A method for preparing red phosphor comprises the following steps: S1. Add 1 g lithium nitrate, 2 g molybdenum nitrate, 3 g manganese nitrate and 5 g nano titanium dioxide into 100 mL deionized water, stir evenly, then drop 10 mL of 1 mol / L oxalic acid solution therein at a dropping rate of 1 mL / min, stir at 60 ° C for 3 h, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere at a calcination temperature of 1100° C. for 6 h, cooling to room temperature after calcination, and crushing through an 800-mesh sieve to obtain a sintered body; S3, adding 8 g of the sintered body and 1 g of vinyltrimethoxysilane into 100 mL of 80 wt% ethanol aqueous solution, stirring for 2 h, and then filtering, washing, and drying to obtain a modified sintered body; S4. Disperse 8 g of the modified sintered body in 100 mL of organic solvent DMF, then add 4 g of p-trifluoromethylstyrene and 0.5 g of initiator benzoyl peroxide, heat and stir at 50°C for 5 h, and after the reaction is completed, filter, wash and dry to obtain a red phosphor.

[0036] Compared with Example 1, Comparative Example 2 did not add aluminum nitrate.

[0037] Comparative Example 3

[0038] A method for preparing red phosphor comprises the following steps: S1. Add 1 g lithium nitrate, 2 g aluminum nitrate, 3 g manganese nitrate and 5 g nano titanium dioxide into 100 mL deionized water, stir evenly, then add 10 mL of 1 mol / L oxalic acid solution dropwise thereto at a dropping rate of 1 mL / min, stir at 60 ° C for 3 h, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere at a calcination temperature of 1100° C. for 6 h, cooling to room temperature after calcination, and crushing through an 800-mesh sieve to obtain a sintered body; S3, adding 8 g of the sintered body and 1 g of vinyltrimethoxysilane into 100 mL of 80 wt% ethanol aqueous solution, stirring for 2 h, and then filtering, washing, and drying to obtain a modified sintered body; S4. Disperse 8 g of the modified sintered body in 100 mL of organic solvent DMF, then add 4 g of p-trifluoromethylstyrene and 0.5 g of initiator benzoyl peroxide, heat and stir at 50°C for 5 h, and after the reaction is completed, filter, wash and dry to obtain a red phosphor.

[0039] Comparative Example 3 was compared with Example 1 without adding platinum nitrate.

[0040] Comparative Example 4

[0041] A method for preparing red phosphor comprises the following steps: S1. Add 1g lithium nitrate, 2g aluminum nitrate, 2g molybdenum nitrate, 3g manganese nitrate and 5g nano titanium dioxide into 100mL deionized water, stir evenly, then add 10mL of 1mol / L oxalic acid solution dropwise thereto at a dropping rate of 1mL / min, stir at 60°C for 3h, then filter, wash and dry to obtain a precipitate; S2. The obtained precipitate is calcined in an air atmosphere at a temperature of 1100° C. for 6 hours. After the calcination, it is cooled to room temperature and crushed through an 800-mesh sieve to obtain a red phosphor.

[0042] Compared with Example 1, Comparative Example 4 does not modify trifluoromethylstyrene.

[0043] The luminous intensity of the red phosphors prepared in Examples 1-3 and Comparative Examples 1-4 was tested using a PE fluorescence spectrometer. The test results are shown in Table 1 below: Table 1

[0044] Moisture resistance test: 0.5 g of the red phosphors prepared in Examples 1-3 and Comparative Example 4 were respectively immersed in 10 mL of deionized water for 6 hours, and then the luminous intensity retention rate was tested. The test results are shown in Table 2 below: Table 2

[0045] It can be seen from Table 2 that the moisture resistance of the red phosphor prepared by the present invention is significantly improved by grafting the trifluoromethylstyrene polymer.

[0046] The present invention also provides an ultra-high color gamut backlight module based on a blue-green light chip, the ultra-high color gamut backlight module comprising a blue-green light chip and a fluorescent glue; wherein the preparation method of the fluorescent glue is as follows: red fluorescent powder is dispersed in an organic solvent, then poured into packaging glue, after sufficient mixing, the organic solvent is removed to obtain the fluorescent glue.

[0047] The present invention provides several installation methods, which are as follows: in, Figure 1 This is a schematic diagram of the structure of the five-sided CSP backlight provided by the present invention, 1 is a blue-green light chip, 2 is a red phosphor; Figure 2 This is a schematic diagram of the structure of a single-sided CSP backlight source provided by the present invention, 3 is a blue-green light chip, and 4 is a red phosphor; Figure 3This is a schematic diagram of the structure of the blue-green flip chip provided by the present invention, 5 is a blue-green chip, and 6 is a red phosphor; Figure 4 This is a schematic diagram of the structure of the blue-green light positive chip provided by the present invention, 7 is the blue-green light chip, 8 is the red phosphor, and 9 is the gold wire.

[0048] Finally, it should be noted that the above embodiments do not limit the present invention in any form. For those skilled in the art, some modifications and improvements can be made to the present invention. Therefore, any modification or improvement made without departing from the spirit of the present invention belongs to the scope of protection claimed in the present invention.

Claims

1. An ultra-high color gamut backlight module based on a blue-green light chip, characterized in that: The ultra-high color gamut backlight module includes a blue-green light chip and a fluorescent glue; wherein the preparation method of the fluorescent glue is as follows: red fluorescent powder is dispersed in an organic solvent, then poured into packaging glue, and after being fully mixed, the organic solvent is removed to obtain the fluorescent glue; Wherein, the preparation method of the red phosphor is as follows: S1. Add lithium nitrate, aluminum nitrate, molybdenum nitrate, manganese nitrate and nano titanium dioxide into deionized water, stir evenly, then drop oxalic acid solution therein, stir at 60-80° C. for 1-3 hours, then filter, wash and dry to obtain a precipitate; S2, calcining the obtained precipitate in an air atmosphere, cooling it to room temperature after calcination, crushing and sieving it to obtain a sintered body; S3, adding the obtained sintered body and vinyl silane coupling agent into an ethanol aqueous solution, stirring for 1-3 hours, and then filtering, washing and drying to obtain a modified sintered body; S4, dispersing the modified sintered body in an organic solvent, then adding trifluoromethylstyrene and an initiator thereto, heating and stirring to react, and after the reaction is completed, filtering, washing and drying to obtain a red phosphor.

2. The ultra-high color gamut backlight module based on the blue-green light chip according to claim 1, characterized in that: In step S1, the mass ratio of lithium nitrate, aluminum nitrate, molybdenum nitrate, manganese nitrate and nano titanium dioxide is 1-3:2-3:2-3:2-4:4-8.

3. The ultra-high color gamut backlight module based on the blue-green light chip according to claim 1, characterized in that: In step S1, the concentration of the oxalic acid solution is 0.5-2 mol / L, and the dropping rate is 1-2 mL / min.

4. The ultra-high color gamut backlight module based on the blue-green light chip according to claim 1, characterized in that: In step S2, the calcination temperature is 1100-1400°C, and the calcination time is 3-6 hours.

5. The ultra-high color gamut backlight module based on blue-green light chip according to claim 1, characterized in that: In step S3, the mass ratio of the sintered body to the vinyl silane coupling agent is 8-10:1-2.

6. The ultra-high color gamut backlight module based on blue-green light chip according to claim 1, characterized in that: In step S3, the vinyl silane coupling agent is selected from vinyl trimethoxy silane or vinyl triethoxy silane.

7. The ultra-high color gamut backlight module based on blue-green light chip according to claim 1, characterized in that: In step S4, the mass ratio of the modified sintered body, p-trifluoromethylstyrene and the initiator is 8-12:4-6:0.5-1.

8. The ultra-high color gamut backlight module based on blue-green light chip according to claim 1, characterized in that: In step S4, the initiator is selected from benzoyl peroxide or dicumyl peroxide.

9. The ultra-high color gamut backlight module based on blue-green light chip according to claim 1, characterized in that: In step S4, the temperature of the heating and stirring reaction is 50-55° C., and the time of the heating and stirring reaction is 3-5 h.

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