High chroma inorganic yellow pigment, preparation method thereof and application of fluorescent powder in improving chroma performance of inorganic yellow pigment

Abstract

The application discloses a high-chroma inorganic yellow pigment, a preparation method thereof and application of a fluorescent powder in improving chroma performance of the inorganic yellow pigment, and relates to the technical field of inorganic pigments. The preparation method is as follows: after mixing the inorganic yellow pigment, the fluorescent powder and water, sequentially performing drying and grinding, a high-chroma inorganic yellow pigment is prepared. The prepared inorganic yellow pigment is tested by a desktop colorimeter, and the results show that the chroma performance parameters of the product, such as brightness value L*, yellowness value b*, color saturation value C* and yellow light area reflectivity, are significantly improved compared with those of a simple reflective pigment, and further through other characterization methods, it is proved that the strong emission of the photoluminescence fluorescent powder significantly enhances the diffuse reflection effect of the inorganic yellow pigment on yellow light. The target product has a wide source of raw materials, excellent chroma performance, better application, and a simple, energy-saving and environment-friendly preparation method.

Description

Technical Field

[0001] This invention relates to the field of inorganic pigment technology, specifically to a highly colorimetric inorganic yellow pigment, its preparation method, and the application of phosphors in improving the colorimetric performance of inorganic yellow pigments. Background Technology

[0002] Yellow pigments are among the most striking of all colored pigments, enjoying a broad market. Traditional yellow pigments can be divided into organic and inorganic yellow pigments. Organic yellow pigments are brightly colored, but their temperature resistance, weather resistance, and corrosion resistance are inferior to inorganic pigments. Inorganic yellow pigments are inorganic metal compounds that strongly absorb blue-violet light in the visible light region (wavelengths around 385–492 nm), exhibiting a complementary color to blue-violet: yellow.

[0003] Inorganic yellow pigments hold a significant position among inorganic pigments due to their large demand and production volume, and are widely used in ceramics, plastics, rubber, inks, and paints. Currently, inorganic yellow pigments include iron yellow, bismuth yellow, chrome yellow, cadmium yellow, praseodymium zirconium yellow, and titanium nickel yellow, among others. Iron yellow is inexpensive but has relatively poor performance; praseodymium zirconium yellow has excellent performance but cannot be mass-produced and is expensive; titanium nickel yellow has poor performance and is difficult to apply; bismuth yellow has excellent coloring performance, slightly lower than chrome and cadmium yellow, and does not contain toxic elements, but due to its high production cost, it cannot currently be widely used in various fields; chrome and cadmium yellow have excellent performance and are inexpensive, but because they contain toxic elements such as chromium and cadmium, their usage has declined in recent years. However, due to their excellent cost-effectiveness and the ability to reduce the content of toxic elements through mixing with organic pigments, they still account for the largest share of use in the inorganic yellow pigment field.

[0004] Phosphors are a class of microcrystalline inorganic powder materials that emit light upon receiving external stimuli. The excitation sources required for phosphor luminescence are varied, including electroluminescence, photoluminescence, chemical reactions, bioenergy, cathode rays, and heat. This discussion focuses only on phosphors using photoluminescence as their excitation source. The components of a photoluminescent phosphor include: a matrix, the main body of the phosphor, which is an inert material that determines the position of the light transition spectrum and the luminescent center, thus exhibiting luminescence behavior. Changes in some chemical components of the matrix affect the phosphor's luminescence characteristics and color tone; an activator, the main luminescent center, which is the core of photoluminescence; and a sensitizer, which acts synergistically, providing another energy boost to the luminescent center. The activator and sensitizer, as dopants, mainly consist of small amounts of transition metals and rare earth elements, which play a major role in the phosphor's luminescence behavior.

[0005] The luminescence principle of photoluminescent phosphors is mainly explained here using the concept of a localized luminescent center. Localized luminescence refers to the energy transfer that occurs during the electronic transition between two energy levels of a single ion or coordinated ion. In simpler terms, the matrix ions or sensitizer ions absorb energy from external light and then transfer that energy to the luminescent center, or the luminescent center directly absorbs energy, causing electrons to transition from the ground state to an excited state. Because the excited state is active, most of the absorbed external energy is dissipated as heat in order to return to the more stable ground state. A small portion of the energy is emitted as photons after ground state relaxation and decay time. If the photon radiation wavelength is in the visible light region, the phosphor will exhibit a certain color, and the emission color can be changed by adding different trace impurities without altering the matrix.

[0006] Inorganic solid photoluminescent phosphors have a wide range of applications, such as displays (plasma displays), lighting (fluorescent lamps and LEDs, etc.), long afterglow materials, upconversion materials, and biofluorescent labeling.

[0007] Improving the reflectivity, hiding power, color saturation, brightness, and yellowness of inorganic yellow pigments has always been a goal of researchers. Whether it's continuously optimizing the synthesis process of inorganic pigments, finding more cost-effective raw materials, preparing novel inorganic pigments, or mixing them with brightly colored organic pigments, these are all directions researchers are striving towards. Compared to the above approaches, incorporating inorganic photoluminescent phosphors into inorganic yellow pigments is a promising new way to enhance their color rendering performance. Furthermore, this principle of utilizing yellow light-emitting phosphors to act on inorganic yellow pigments has not yet been reported. In conclusion, based on the fact that the color rendering or luminescence principles of both materials involve electron transitions after energy absorption, it is reasonable to believe that the phosphor has a positive effect on inorganic pigments.

[0008] visible light excited Y 3-x Al5O 12 :xCe 3+ Visible light-excited yellow phosphors can absorb the complementary color of yellow, namely blue-violet light. Under sunlight, they can reflect yellow light themselves and emit yellow light when excited. Traditional inorganic yellow pigments, such as BiVO4, can absorb the complementary color, blue-violet light, and more than visible light-excited yellow phosphors. Therefore, when visible light-excited yellow phosphors replace traditional inorganic yellow pigments, although the flux of reflected light increases under sunlight, the yellow quality of visible light-excited yellow phosphors is worse than that of traditional inorganic yellow pigments because they do not absorb enough in the blue-violet region (the complementary color of yellow).

[0009] To date, no advanced inorganic yellow pigment has been developed internationally. Therefore, how to develop a green, environmentally friendly inorganic yellow pigment with high color rendering is a pressing problem that needs to be solved in this field. Summary of the Invention

[0010] The purpose of this invention is to provide a high color rendering inorganic yellow pigment, its preparation method, and the application of phosphor in improving the color rendering performance of inorganic yellow pigments, so as to solve the problems of poor quality, inability to mass-produce, high price, and toxic elements in existing inorganic yellow pigments, and to fill the gap in the lack of advanced inorganic yellow pigments in the prior art.

[0011] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0012] This invention provides an application of phosphor in improving the color development performance of inorganic yellow pigments, wherein the phosphor contains Y 3-x Al5O 12 :xCe 3+ Powder, Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ Powder or Sr (2-x-y) Ba y SiO4:xEu 2+ Powder;

[0013] Inorganic yellow pigments contain BiVO4 or PbCrO4;

[0014] The Y 3-x Al5O 12 :xCe 3+ In powder, 0.04≤x≤0.08;

[0015] The Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ In powder, 0.04≤x≤0.08, 0≤y≤1.20;

[0016] The Sr (2-x-y) Ba y SiO4:xEu 2+ In powder, 0.02≤x≤0.08, 0.10≤y≤0.80.

[0017] Preferably, the fluorescent powder accounts for 3 to 35% of the total mass of the fluorescent powder and the inorganic yellow pigment.

[0018] Preferably, the average particle size of the inorganic yellow pigment is ≤1μm; the average particle size of the phosphor is 10-15μm.

[0019] Another object of the present invention is to provide a highly colorimetric inorganic yellow pigment, composed of a fluorescent powder and an inorganic yellow pigment, wherein the fluorescent powder contains Y 3-x Al5O 12 :xCe 3+ Powder, Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ Powder or Sr (2-x-y) Ba y SiO4:xEu 2+ Powder;

[0020] Inorganic yellow pigments contain BiVO4 or PbCrO4;

[0021] The Y 3-x Al5O 12 :xCe 3+ In powder, 0.04≤x≤0.08;

[0022] The Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ In powder, 0.04≤x≤0.08, 0≤y≤1.20;

[0023] The Sr (2-x-y) Ba y SiO4:xEu 2+ In powder, 0.02≤x≤0.08, 0.10≤y≤0.80.

[0024] Preferably, the fluorescent powder accounts for 3 to 35% of the total mass of the fluorescent powder and the inorganic yellow pigment;

[0025] The average particle size of inorganic yellow pigments is ≤1μm; the average particle size of phosphors is 10~15μm.

[0026] Another object of the present invention is to provide a method for preparing a highly colorimetric inorganic yellow pigment, comprising the following steps:

[0027] A highly colorimetric inorganic yellow pigment is prepared by mixing an inorganic yellow pigment, a fluorescent powder, and water, followed by drying and grinding in sequence.

[0028] Preferably, the ratio of the total mass of fluorescent powder and inorganic yellow pigment to water is 1.0000–1.1000 g: 5–15 ml.

[0029] Preferably, the mixing is carried out under ultrasonic vibration conditions, with an ultrasonic frequency of 28-40 kHz and a duration of 5-15 min.

[0030] Preferably, the drying temperature is 50-90°C and the time is 1-3 hours.

[0031] Preferably, the fineness of the grinding is ≤15μm.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The technical solution of this invention proposes for the first time to mechanically mix an inorganic yellow pigment with high absorption of blue light and high reflection of yellow light with a phosphor that emits visible yellow light strongly after being stimulated to emit light. This results in the mixed powder exhibiting a superposition effect of the fluorescent pigment absorbing and reflecting light and the phosphor exciting and emitting light in the long-wavelength region of visible light. Consequently, the diffuse reflection effect of the fluorescent pigment on yellow under sunlight is significantly enhanced, thereby improving its color rendering performance.

[0034] The inorganic yellow pigment prepared by the invention was compared with that of a simple reflective pigment using a benchtop colorimeter. The results showed that the product's color rendering performance parameters, such as luminance value L*, yellowness value b*, color saturation value C*, and reflectance in the yellow light region, were significantly improved compared with those of a simple reflective pigment. The raw materials required for the target product of this invention are widely available, the target product can be applied in a wider range of applications, and when using this method to improve the performance of other inorganic pigments, the doping ratio will vary depending on the properties of the pigment and the phosphor. Attached Figure Description

[0035] Figure 1 Linear graphs of chromaticity values ​​(brightness value L*, yellowness value b*, and color saturation C*) after different yellow light-emitting phosphors are mixed with yellow pigment in different proportions;

[0036] Where (a) is Y 2.94 Al5O 12 0.06Ce 3+ Linear graphs of chromaticity parameters after adding BiVO4 pigment to phosphor at different proportions;

[0037] (b) is Y 2.94 Al5O 12 0.06Ce 3+ Linear graphs of chromaticity parameters after adding PbCrO4 pigment to phosphor at different proportions;

[0038] (c) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Linear graphs of chromaticity parameters after adding BiVO4 pigment to phosphor at different proportions;

[0039] (d) is Sr 1.54 Ba 0.40SiO4: 0.06Eu 2+ Linear graphs of chromaticity parameters after adding PbCrO4 pigment to phosphor at different proportions;

[0040] (e) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Linear graphs of chromaticity parameters after adding BiVO4 pigment to phosphor at different proportions;

[0041] (f) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Linear graphs of chromaticity parameters after adding PbCrO4 pigment to phosphor at different proportions.

[0042] Figure 2 The reflectance spectra of different yellow light-emitting phosphors after adding yellow pigment at different proportions;

[0043] Where (a) is Y 2.94 Al5O 12 0.06Ce 3+ Reflectance spectra of phosphors after incorporating BiVO4 pigment at different proportions;

[0044] (b) is Y 2.94 Al5O 12 0.06Ce 3+ Reflectance spectra of phosphors after incorporating PbCrO4 pigment at different proportions;

[0045] (c) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Reflectance spectra of phosphors after incorporating BiVO4 pigment at different proportions;

[0046] (d) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Reflectance spectra of phosphors after incorporating PbCrO4 pigment at different proportions;

[0047] (e) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Reflectance spectra of phosphors after incorporating BiVO4 pigment at different proportions;

[0048] (f) is Y 2.79 Al5O 120.06Ce 3+ 0.15Gd 3+ Reflectance spectra of phosphors after incorporating PbCrO4 pigment at different proportions.

[0049] Figure 3 The excitation-emission spectrum of the yellow light-emitting phosphor and the reflection spectrum of the phosphor under the optimal mixing ratio of the yellow light-emitting phosphor and the inorganic yellow pigment are shown.

[0050] Where (a) is Y 2.94 Al5O 12 0.06Ce 3+ Excitation-emission spectrum of phosphors;

[0051] (b) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Excitation-emission spectrum of phosphors;

[0052] (c) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Excitation-emission spectrum of phosphors;

[0053] (d) is Y 2.94 Al5O 12 0.06Ce 3+ The reflectance spectrum of the fluorescent pigment at the optimal mixing ratio of phosphor and BiVO4;

[0054] (e) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The reflectance spectrum of the fluorescent pigment at the optimal mixing ratio of phosphor and BiVO4;

[0055] (f) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The reflectance spectrum of the fluorescent pigment at the optimal mixing ratio of phosphor and BiVO4;

[0056] (g) is Y 2.94 Al5O 12 0.06Ce 3+ The reflectance spectrum of the fluorescent pigment under the optimal mixing ratio of phosphor and PbCrO4;

[0057] (h) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+The reflectance spectrum of the fluorescent pigment under the optimal mixing ratio of phosphor and PbCrO4;

[0058] (i) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The reflectance spectrum of the fluorescent pigment under the optimal mixing ratio of phosphor and PbCrO4.

[0059] Figure 4 SEM images of yellow light-emitting phosphor and SEM images of fluorescent pigments at the optimal mixing ratio of yellow light-emitting phosphor and inorganic yellow pigment;

[0060] Where (a) is Y 2.94 Al5O 12 0.06Ce 3+ SEM images of phosphors;

[0061] (b) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ SEM images of phosphors;

[0062] (c) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ SEM images of phosphors;

[0063] (d) is Y 2.94 Al5O 12 0.06Ce 3+ SEM images of fluorescent pigments at the optimal mixing ratio of phosphor and BiVO4;

[0064] (e) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ SEM images of fluorescent pigments at the optimal mixing ratio of phosphor and BiVO4;

[0065] (f) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ SEM images of fluorescent pigments at the optimal mixing ratio of phosphor and BiVO4;

[0066] (g) is Y 2.94 Al5O 12 0.06Ce 3+ SEM images of fluorescent pigments at the optimal mixing ratio of phosphor and PbCrO4;

[0067] (h) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ SEM images of fluorescent pigments at the optimal mixing ratio of phosphor and PbCrO4;

[0068] (i) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ SEM images of fluorescent pigments at the optimal mixing ratio of phosphor and PbCrO4.

[0069] Figure 5 Dark-field image of the fluorescent pigment under 455nm excitation, given the optimal mixing ratio of yellow light-emitting phosphor and inorganic yellow pigment;

[0070] (a) is Y 2.94 Al5O 12 0.06Ce 3+ Dark-field image of the fluorescent pigment under 455nm excitation at the optimal mixing ratio of phosphor and BiVO4;

[0071] (b) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Dark-field image of the fluorescent pigment under 455nm excitation at the optimal mixing ratio of phosphor and BiVO4;

[0072] (c) is Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Dark-field image of the fluorescent pigment under 455nm excitation at the optimal mixing ratio of phosphor and BiVO4;

[0073] (d) is Y 2.94 Al5O 12 0.06Ce 3+ Dark-field image of the fluorescent pigment under 455nm excitation at the optimal mixing ratio of phosphor and PbCrO4;

[0074] (e) is Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Dark-field image of the fluorescent pigment under 455nm excitation at the optimal mixing ratio of phosphor and PbCrO4;

[0075] (f) is a dark-field image of the fluorescent pigment under 455 nm excitation, with the optimal mixing ratio of Y2.79Al5O12:0.06Ce3+,0.15Gd3+ phosphor and PbCrO4.

[0076] Figure 6 This is a schematic diagram illustrating the mechanism of action of yellow light-emitting phosphor on yellow pigment.

[0077] Figure 7 This is a schematic diagram of a physical simulation of a mixture of yellow light-emitting phosphor and inorganic yellow pigment.

[0078] Figure 8 The L*, a*, and b* chromaticity coordinates of the inorganic yellow pigment after being mixed with three kinds of yellow light-emitting phosphors, respectively. Detailed Implementation

[0079] This invention provides an application of phosphor in improving the color development performance of inorganic yellow pigments, wherein the phosphor contains Y 3-x Al5O 12 :xCe 3+ Powder, Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ Powder or Sr (2-x-y) Ba y SiO4:xEu 2+ Powder;

[0080] Inorganic yellow pigments contain BiVO4 or PbCrO4;

[0081] The Y 3-x Al5O 12 :xCe 3+ In the powder, 0.04≤x≤0.08, preferably 0.05≤x≤0.07, and more preferably 0.06≤x≤0.07;

[0082] The Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ In the powder, 0.04≤x≤0.08, preferably 0.05≤x≤0.07, and more preferably 0.06≤x≤0.07; 0≤y≤1.20, preferably 0.20≤y≤1.00, and more preferably 0.40≤y≤0.80;

[0083] The Sr (2-x-y) Ba y SiO4:xEu 2+In the powder, 0.02≤x≤0.08, preferably 0.03≤x≤0.07, and even more preferably 0.04≤x≤0.06; 0.10≤y≤0.80, preferably 0.20≤y≤0.70, and even more preferably 0.40≤y≤0.60.

[0084] In this invention, the fluorescent powder preferably accounts for 3 to 35% of the total mass of the fluorescent powder and the inorganic yellow pigment, more preferably 5 to 30%, and even more preferably 10 to 20%.

[0085] In this invention, the preferred embodiment is: the inorganic yellow pigment is BiVO4, and the fluorescent powder is Y. 3-x Al5O 12 :xCe 3+ Powder, Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ Powder or Sr (2-x-y) Ba y SiO4:xEu 2+ The powder, preferably comprising 5-30% of the total mass of the fluorescent powder and inorganic yellow pigment.

[0086] In this invention, another preferred embodiment is: the inorganic yellow pigment is PbCrO4, and the fluorescent powder is Y. 3-x Al5O 12 :xCe 3+ Powder or Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ The powder, preferably comprising 5-30% of the total mass of the fluorescent powder and inorganic yellow pigment.

[0087] In this invention, another preferred embodiment is: the inorganic yellow pigment is PbCrO4, and the phosphor is Sr. (2-x-y) Ba y SiO4:xEu 2+ The powder, preferably comprising 5-20% of the total mass of the fluorescent powder and inorganic yellow pigment.

[0088] In this invention, the average particle size of the inorganic yellow pigment is preferably ≤1μm; the average particle size of the phosphor is preferably 10-15μm, and more preferably 12-14μm.

[0089] Another object of the present invention is to provide a highly colorimetric inorganic yellow pigment, composed of a fluorescent powder and an inorganic yellow pigment, wherein the fluorescent powder contains Y 3-x Al5O 12 :xCe 3+ Powder, Y (3-x-y) Al5O12 :xCe 3+ yGd 3+ Powder or Sr (2-x-y) Ba y SiO4:xEu 2+ Powder;

[0090] Inorganic yellow pigments contain BiVO4 or PbCrO4;

[0091] The Y 3-x Al5O 12 :xCe 3+ In the powder, 0.04≤x≤0.08, preferably 0.05≤x≤0.07, and more preferably 0.06≤x≤0.07;

[0092] The Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ In the powder, 0.04≤x≤0.08, preferably 0.05≤x≤0.07, and more preferably 0.06≤x≤0.07; 0≤y≤1.20, preferably 0.20≤y≤1.00, and more preferably 0.40≤y≤0.80;

[0093] The Sr (2-x-y) Ba y SiO4:xEu 2+ In the powder, 0.02≤x≤0.08, preferably 0.03≤x≤0.07, and even more preferably 0.04≤x≤0.06; 0.10≤y≤0.80, preferably 0.20≤y≤0.70, and even more preferably 0.40≤y≤0.60.

[0094] In this invention, the fluorescent powder preferably accounts for 3-35% of the total mass of the fluorescent powder and the inorganic yellow pigment, more preferably 5-30%, and even more preferably 10-20%.

[0095] The average particle size of the inorganic yellow pigment is preferably ≤1μm; the average particle size of the phosphor is preferably 10-15μm, and more preferably 12-14μm.

[0096] Another object of the present invention is to provide a method for preparing a highly colorimetric inorganic yellow pigment, comprising the following steps:

[0097] A highly colorimetric inorganic yellow pigment is prepared by mixing an inorganic yellow pigment, a fluorescent powder, and water, followed by drying and grinding in sequence.

[0098] In this invention, the preferred ratio of the total mass of fluorescent powder and inorganic yellow pigment to water is 1.0000-1.100g: 5-15ml, more preferably 1.0000-1.0100g: 6-14ml, and even more preferably 1.0000-1.0010g: 8-12ml.

[0099] In this invention, the mixing is carried out under ultrasonic vibration conditions, wherein the ultrasonic frequency of the ultrasonic vibration is preferably 28-40 kHz, more preferably 30-40 kHz, and even more preferably 35-40 kHz; the time is preferably 5-15 min, more preferably 8-12 min, and even more preferably 9-11 min.

[0100] In this invention, the drying temperature is preferably 50-90°C, more preferably 55-85°C, and even more preferably 60-80°C; the drying time is preferably 1-3 hours, more preferably 1-2 hours, and even more preferably 1-1.5 hours.

[0101] In this invention, the fineness of the grinding is preferably ≤15μm, more preferably ≤12μm, and even more preferably ≤10μm.

[0102] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0103] Example 1

[0104] This embodiment is to use Y 3-x Al5O 12 :xCe 3+ The powder is incorporated into the inorganic yellow pigment BiVO4 to improve the pigment's performance. The specific steps are as follows:

[0105] This embodiment uses commercially available powder to achieve better mixing results.

[0106] Weigh Y according to the mass ratios shown in Table 1. 2.94 Al5O 12 0.06Ce 3+ The specific data for BiVO4 powder and inorganic yellow pigment are shown in Table 1 below.

[0107] Table 1. Theoretical mass ratio and actual weighing data (Note: The ratio is based on a total mass of 1g).

[0108]

[0109] (Note: Y 2.94 Al5O 12 0.06Ce 3+The powder was prepared in the laboratory (preparation process: Y2O3, Al2O3, and CeO2 were weighed in stoichiometric proportions as raw materials, 1% NH4Cl was used as a flux, and anhydrous ethanol was used as a dispersant. The mixture was thoroughly mixed in an agate mortar, dried, and ground into powder again. The powder was then transferred to a corundum crucible and kept at 1400℃ for 4 hours in a tube furnace under a reducing atmosphere. After natural cooling, the powder was ground to obtain the fluorescent powder with an average particle size of 10-15 μm; the BiVO4 pigment had a particle size ≤1 μm and a purity ≥99.9%).

[0110] The preparation methods for the above different mass ratio schemes are all: Y 2.94 Al5O 12 0.06Ce 3+ The powder and BiVO4 pigment were mixed and dissolved in 5 ml of distilled water. The mixture was ultrasonically vibrated at 32 kHz for 10 min to ensure thorough mixing. Then, it was dried at 60 °C for 3 h and finally ground thoroughly in a mortar to obtain the target powder with a fineness of 1–5 μm.

[0111] In this embodiment, a benchtop colorimeter is used to test the sample. The sample is pressed into a powder cake shape in a test reflective dish. Ultraviolet and visible light are used as the light source and in reflective mode to directly measure the sample. A comparative measurement mode is used to compare the parameter values ​​of the undoped phosphor and the mixed powder, thereby determining the presence of Y doping. 2.94 Al5O 12 0.06Ce 3+ The positive effect of powder on BiVO4 yellow inorganic pigment.

[0112] The conclusion drawn from this embodiment is: Y 2.94 Al5O 12 0.06Ce 3+ The mixing ratio of powder to BiVO4 yellow inorganic pigment is 15%:85%, which has the greatest impact on the colorimetric properties of the pigment. See Table 2 for details.

[0113] Table 2. Doping with different amounts of Y 2.94 Al5O 12 0.06Ce 3+ Test data of BiVO4 pigments in powder form

[0114] <![CDATA[Y 2.94 Al5O 12 :0.06Ce 3+ :BiVO4]]> L* b* C* h* 1 0:100％ 83.25 64.82 64.84 91.52 2 5％：95％ 86.11 67.33 67.37 91.95 3 10％：90％ 86.71 68.84 68.85 91.09 4 15％：85％ 87.69 69.82 69.85 91.61 5 20％：80％ 87.11 68.44 68.49 92.10 6 25％：75％ 86.87 68.12 68.16 91.98 7 30％：70％ 86.18 66.44 66.87 92.39

[0115] Table 2 shows the results for different amounts of Y doped. 2.94 Al5O 12 0.06Ce 3+ The chromaticity data of BiVO4 pigment powder shows that, compared to BiVO4 pigment without phosphor, when Y... 2.94 Al5O 12 0.06Ce3+ When the mixing ratio of powder to BiVO4 pigment is 15%:85%, the brightness value L* increases by 5.3%, indicating that Y 2.94 Al5O 12 0.06Ce 3+ The incorporation of the phosphor significantly enhanced the brightness of the BiVO4 pigment, making it appear brighter; the yellowness value b* increased by 7.7%, indicating that the inorganic pigment was more yellow under simulated sunlight after the phosphor was incorporated; the color saturation value C* increased by 7.7%, indicating that the incorporation of the phosphor significantly enhanced the color saturation of the pigment, making it appear more vibrant; the hue value h* remained within a stable range, indicating that the incorporation of the phosphor did not destroy the yellow hue of the pigment compared to pure pigment. Figure 1 (a) shows Y 2.94 Al5O 12 0.06Ce 3+ The linear graph of the chromaticity value parameters after BiVO4 pigment is added to the powder more intuitively reflects the change of pigment chromaticity value with the amount of phosphor added, and the chromaticity value reaches its peak when the phosphor content is 15%. Figure 2 (a) shows Y 2.94 Al5O 12 0.06Ce 3+ The reflectance spectrum measured after incorporating BiVO4 pigment into the powder shows that the addition of phosphor significantly improves the reflectance of the pigment in the yellow light band. Furthermore, compared to pure pigment, the reflectance of the pigment with 15% phosphor incorporation increases by 14.8%. Based on these data changes, it can be concluded that BiVO4 pigment significantly improves reflectance in the Y wavelength range. 2.94 Al5O 12 0.06Ce 3+ After the powder is incorporated, its coloring ability is significantly improved, and the effect is most significant when the incorporation ratio is 15%.

[0116] Example 2

[0117] This embodiment is to use Sr (2-x-y) Ba y SiO4:xEu 2+ The performance of the yellow phosphor is improved by incorporating the inorganic yellow pigment BiVO4 into the yellow phosphor. The specific steps are as follows:

[0118] This example uses commercial pigment powder to achieve better mixing results.

[0119] Weigh out Sr according to the mass ratios shown in Table 3. 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The specific data for BiVO4 powder and inorganic yellow pigment are shown in Table 3 below.

[0120] Table 3. Theoretical mass ratio and actual weighing data: (Note: The ratio is based on a total mass of 1g)

[0121]

[0122] (Note: Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The yellow fluorescent powder was prepared in the laboratory (preparation process: using SrCO). 3, BaCO 3, SiO 2, Eu2O3 was weighed according to a stoichiometric ratio (x = 0.06, y = 0.40) using 1% H3BO3 as a flux. The mixture was thoroughly stirred in an agate mortar (diluted with anhydrous ethanol), dried in an oven, and ground into powder. The powder was then placed in a corundum crucible and pre-calcined at 1000℃ for 1 hour, followed by holding at 1400℃ for 4 hours in a mixed atmosphere (5% H2 + 95% N2). After natural cooling, the powder was ground to obtain the sample, with an average particle size of 10-15 μm. The BiVO4 pigment had a particle size of less than 1 μm and a purity ≥99.9%.

[0123] The preparation methods for the above different mass ratio schemes are all as follows:

[0124] Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The powder and BiVO4 pigment were mixed and dissolved in 10 ml of distilled water. The mixture was ultrasonically vibrated at 30 kHz for 15 min to ensure thorough mixing. Then, it was dried at 80 °C for 1.5 h and finally ground thoroughly in a mortar to obtain the target powder with a fineness of 5–10 μm.

[0125] This embodiment uses a benchtop colorimeter. The sample is pressed into a powder cake shape in a test reflective dish. Ultraviolet and visible light are used as the light source and in reflective mode to directly measure the sample. A comparative measurement mode is used to compare the parameter values ​​of undoped phosphor and mixed powder, thereby determining the Sr doping level. 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The positive effect of yellow phosphor on inorganic yellow pigment BiVO4.

[0126] The conclusion drawn from this embodiment is: Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The mixing ratio of powder to BiVO4 pigment is 20%:80%, which has the greatest impact on the colorimetric properties of the pigment. See Table 4 below for details:

[0127] Table 4. Different amounts of Sr doping 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Test data of BiVO4 pigments in powder form

[0128]

[0129]

[0130] Table 4 shows the Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ A comparison of chromaticity parameters after incorporating BiVO4 pigment into the powder shows that, compared to pure pigment, when the mixing ratio of phosphor to pigment is 20%:80%, the luminance value L* increases by 5.0%, indicating that Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The incorporation of the phosphor significantly enhanced the color brightness of the BiVO4 pigment, making it appear brighter; the yellowness value b* increased by 4.2%, indicating that the incorporation of the phosphor made the inorganic pigment more yellow under simulated sunlight; the color saturation value C* increased by 4.1%, indicating that the incorporation of the phosphor significantly enhanced the color saturation of the pigment, making the pigment color appear more vibrant; the hue value h* remained within a stable range, indicating that compared to pure pigment, the incorporation of the phosphor did not destroy the yellow hue of the pigment. Figure 1 (c) shows Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The linear graph of the chromaticity value parameters after BiVO4 pigment is added to the powder more intuitively reflects the change of pigment chromaticity value with the amount of phosphor added, and the chromaticity value reaches its peak when the phosphor content is 20%. Figure 2 (c) shows Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The reflectance spectrum measured after incorporating BiVO4 pigment into the powder shows that the addition of phosphor significantly improves the reflectance of the pigment in the yellow light band. Furthermore, compared to pure pigment, the reflectance of the pigment with 20% phosphor incorporation increases by 13.7%. Based on the above data comparison, it can be concluded that BiVO4 pigment in Sr... 1.54 Ba 0.40 SiO4: 0.06Eu 2+ After the powder is incorporated, its coloring ability is significantly improved, and the effect is most significant when the incorporation ratio is 20%.

[0131] Example 3

[0132] This embodiment is to use Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ The phosphor is incorporated into BiVO4 inorganic yellow pigment to improve the pigment's performance. The specific steps are as follows:

[0133] This embodiment uses commercially available powder to achieve better mixing results.

[0134] Weigh Y according to the mass ratio shown in Table 5. 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The specific data for BiVO4 powder and inorganic yellow pigment are shown in Table 5 below.

[0135] Table 5. Theoretical mass ratio and actual weighing data (Note: The ratio is based on a total mass of 1g).

[0136]

[0137]

[0138] (Note; Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The yellow light-emitting phosphor was prepared in the laboratory (preparation process: Y2O3, Al2O3, CeO2, and Gd2O3 were weighed in stoichiometric ratio (where x = 0.06, y = 0.15) as raw materials, 1% H3BO3 was used as a flux, and anhydrous ethanol was used as a dispersant. The mixture was thoroughly mixed in an agate mortar, dried, and ground into powder again. The powder was then transferred to a corundum crucible and heated in a tube furnace under a reducing atmosphere (5% H2 + 95% N2) at 1450℃ for 4 hours. After natural cooling, the powder was ground to obtain the phosphor powder with an average particle size of 10-15 μm; the BiVO4 pigment had a particle size ≤1 μm and a purity ≥99.9%).

[0139] The preparation methods for the above different mass ratio schemes are all: Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The powder and BiVO4 pigment were mixed and dissolved in 15 ml of distilled water. The mixture was ultrasonically vibrated at 40 kHz for 8 min to ensure thorough mixing. Then, it was dried at 90 °C for 1 h and finally ground thoroughly in a mortar to obtain the target powder with a fineness of 10–15 μm.

[0140] In this embodiment, a benchtop colorimeter is used to test the sample. The sample is pressed into a powder cake shape in a test reflective dish. Ultraviolet and visible light are used as the light source and in reflective mode to directly measure the sample. A comparative measurement mode is used to compare the parameter values ​​of the undoped phosphor and the mixed powder, thereby determining the presence of Y doping. 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The positive effect of powder on BiVO4 yellow inorganic pigment.

[0141] The conclusion drawn from this embodiment is: Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The mixing ratio of powder to BiVO4 yellow inorganic pigment is 15%:85%, which has the greatest impact on the colorimetric properties of the pigment. See Table 6 below for details:

[0142] Table 6. Doping with different amounts of Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Test data of BiVO4 pigments in powder form

[0143] <![CDATA[Y 2.79 Al5O 12 :0.06Ce 3+ ,0.15Gd 3+ :BiVO4]]> L* b* C* h* 1 0:100％ 83.25 64.82 64.84 91.52 2 5％：95％ 87.02 68.47 68.59 91.94 3 10％：90％ 88.18 69.02 69.07 91.81 4 15％：85％ 88.43 69.50 69.22 92.08 5 20％：80％ 87.54 68.56 68.61 92.14 6 25％：75％ 86.91 67.48 67.51 91.76 7 30％：70％ 84.49 66.33 66.42 89.88

[0144] Table 6 shows Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ A comparison of chromaticity parameters after incorporating BiVO4 pigment into the powder shows that, compared to pure pigment, when the mixing ratio of phosphor to pigment is 15%:85%, the luminance value L* increases by 6.2%, indicating that Y... 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The incorporation of the phosphor significantly enhanced the color brightness of the BiVO4 pigment, resulting in a brighter color. The yellowness value (b*) increased by 7.2%, indicating that the incorporation of the phosphor made the inorganic pigment more yellow under simulated sunlight. The color saturation value (C*) increased by 6.8%, indicating that the incorporation of the phosphor significantly improved the color saturation of the pigment, making the pigment color appear more vibrant. The hue value (h*) remained within a stable range, indicating that the incorporation of the phosphor did not damage the yellow hue of the pigment compared to pure pigment. Figure 1 (e) shows Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The linear graph of the chromaticity value parameters after BiVO4 pigment is added to the powder more intuitively reflects the change of pigment chromaticity value with the amount of phosphor added, and the chromaticity value reaches its peak when the phosphor content is 15%. Figure 2 (e) shows Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The reflectance spectrum measured after incorporating BiVO4 pigment into the powder shows that the addition of phosphor significantly improves the reflectance of the pigment in the yellow light band. Furthermore, compared to pure pigment, the reflectance of the pigment with 15% phosphor incorporation increases by 16.5%. Based on the above data comparison, it can be concluded that BiVO4 pigment has a high reflectance in the Y wavelength range. 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ After the powder is incorporated, its coloring ability is significantly improved, and the effect is most significant when the incorporation ratio is 15%.

[0145] Example 4

[0146] This embodiment is Y. 3-x Al5O 12 :xCe 3+ The performance of a phosphor is improved by incorporating an inorganic yellow pigment, PbCrO4. The specific steps are as follows:

[0147] This example uses commercial pigment powder to achieve better mixing results.

[0148] Weigh Y according to the mass ratios shown in Table 7. 2.94 Al5O 12 0.06Ce 3+ The specific data for the fluorescent powder and the inorganic yellow pigment PbCrO4 are shown in Table 7 below.

[0149] Table 7. Theoretical mass ratio and actual weighing data (Note: The ratio is based on a total mass of 1g).

[0150]

[0151] (Note; Y 2.94 Al5O 12 0.06Ce 3+ The powder was prepared in the laboratory, with an average particle size of 10–15 μm; the PbCrO4 pigment had a particle size ≤1 μm and a purity ≥99.9%.

[0152] The preparation methods for the above different mass ratio schemes are all: Y 2.94 Al5O12 0.06Ce 3+ The powder and PbCrO4 pigment were mixed and dissolved in 6 ml of distilled water. The mixture was ultrasonically vibrated at 35 kHz for 12 min to ensure thorough mixing. Then, it was dried at 70 °C for 2.5 h and finally ground thoroughly in a mortar to obtain the target powder with a fineness of ≤15 μm.

[0153] In this embodiment, a benchtop colorimeter is used to test the sample. The sample is pressed into a powder cake shape in a test reflective dish. Ultraviolet and visible light are used as the light source and in reflective mode to directly measure the sample. A comparative measurement mode is used to compare the parameter values ​​of the undoped phosphor and the mixed powder, thereby determining the presence of Y doping. 2.94 Al5O 12 0.06Ce 3+ The positive effect of powder on PbCrO4 yellow inorganic pigment.

[0154] The conclusion drawn from this embodiment is: Y 2.94 Al5O 12 0.06Ce 3+ The mixing ratio of powder to PbCrO4 yellow inorganic pigment is 15%:85%, which has the greatest impact on the colorimetric properties of the pigment. See Table 8 for details:

[0155] Table 8. Doping with different amounts of Y 2.94 Al5O 12 0.06Ce 3+ Test data of PbCrO4 pigment in phosphors

[0156] <![CDATA[Y 2.94 Al5O 12 :0.06Ce 3+ :PbCrO4]]> L* b* C* h* 1 0:100％ 75.59 64.76 68.08 72.03 2 5％：95％ 75.96 65.18 68.46 72.20 3 10％：90％ 77.84 67.59 70.89 72.46 4 15％：85％ 80.15 70.69 73.99 72.83 5 20％：80％ 79.10 67.78 70.64 73.66 6 25％：75％ 77.55 66.79 69.94 72.74 7 30％：70％ 77.44 66.42 69.35 73.28

[0157] Table 8 shows the results of different amounts of Y doping. 2.94 Al5O 12 0.06Ce 3+ A comparison of the chromaticity parameters of PbCrO4 pigment with yellow phosphor shows that, compared to PbCrO4 pigment without phosphor, when the mixing ratio of phosphor to pigment is 15%:85%, the luminance value L* increases by 6.0%, indicating that Y... 2.94 Al5O 12 0.06Ce 3+ The incorporation of yellow phosphor significantly enhanced the brightness of the PbCrO4 pigment, making it appear brighter; the yellowness value b* increased by 9.2%, indicating that the inorganic pigment was more yellow under simulated sunlight after the phosphor was incorporated; the color saturation value C* increased by 8.7%, indicating that the incorporation of phosphor significantly enhanced the color saturation of the pigment, making it appear more vibrant; the hue value h* remained within a stable range, indicating that the incorporation of phosphor did not destroy the yellow hue of the pigment compared to pure pigment. Figure 1 (b) shows Y2.94 Al5O 12 0.06Ce 3+ The linear graph of the chromaticity value parameters after the phosphor is incorporated into the PbCrO4 pigment shows more intuitively how the pigment chromaticity value changes with the amount of phosphor incorporated, and the chromaticity value reaches its peak when the phosphor content is 15%. Figure 2 (b) shows Y 2.94 Al5O 12 0.06Ce 3+ The reflectance spectrum of PbCrO4 pigment after incorporating phosphor shows that the addition of phosphor significantly improves the reflectance of the pigment in the yellow light band. Furthermore, compared to pure pigment, the reflectance of the pigment with 15% phosphor incorporation increases by 16.3%. Based on these changes, it can be concluded that PbCrO4 pigment exhibits improved reflectance in the Y wavelength range. 2.94 Al5O 12 0.06Ce 3+ The addition of yellow phosphor significantly enhances its color rendering ability, with the most significant effect observed at a 15% addition rate.

[0158] Example 5

[0159] This embodiment is to use Sr (2-x-y) Ba y SiO4:xEu 2+ The yellow phosphor is incorporated into the inorganic yellow pigment PbCrO4 to improve the performance of the pigment. The specific steps are as follows:

[0160] This example uses commercial pigment powder to achieve better mixing results.

[0161] Weigh out Sr according to the mass ratios shown in Table 9. 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The specific data for the powder and inorganic yellow pigment PbCrO4 are shown in Table 9 below.

[0162] Table 9. Theoretical mass ratio and actual weighing data: (Note: The ratio is based on a total weight of 1g)

[0163]

[0164] (Note: Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The yellow phosphor was prepared in the laboratory, with an average particle size of 10-15 μm; the PbCrO4 pigment had a particle size of less than 1 μm and a purity of ≥99.9%.

[0165] The preparation methods for the above different mass ratio schemes are all as follows:

[0166] Sr (2-x-y) Ba y SiO4:xEu 2+ The powder and PbCrO4 pigment were mixed and dissolved in 12 ml of distilled water. The mixture was ultrasonically vibrated at 38 kHz for 8 min to ensure thorough mixing. Then, it was dried at 90 °C for 1 h and finally ground thoroughly in a mortar to obtain the target powder with a fineness of 5–10 μm.

[0167] This embodiment uses a benchtop colorimeter. The sample is pressed into a powder cake shape in a test reflective dish. Ultraviolet and visible light are used as the light source and in reflective mode to directly measure the sample. A comparative measurement mode is used to compare the parameter values ​​of undoped phosphor and mixed powder, thereby determining the Sr doping level. 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The positive effect of powder on inorganic yellow pigment PbCrO4.

[0168] The conclusion drawn from this embodiment is: Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The mixing ratio of powder to PbCrO4 yellow inorganic pigment is 15%:85%, which has the greatest impact on the colorimetric properties of the pigment. See Table 10 for details.

[0169] Table 10. Different doping amounts: Sr 154 Ba 040 SiO4: 0.06Eu 2+ Test data of powdered PbCrO4 pigment

[0170]

[0171]

[0172] Table 10 shows the Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ A comparison of chromaticity parameters after incorporating PbCrO4 pigment into the powder shows that, compared to pure pigment, when the mixing ratio of phosphor to pigment is 15%:85%, the luminance value L* increases by 5.3%, indicating that Sr... 1.54 Ba 0.40 SiO4: 0.06Eu 2+The incorporation of the phosphor significantly enhanced the color brightness of the PbCrO4 pigment, making it appear brighter; the yellowness value b* increased by 6.8%, indicating that the incorporation of the phosphor made the inorganic pigment more yellow under simulated sunlight; the color saturation value C* increased by 6.4%, indicating that the incorporation of the phosphor significantly enhanced the color saturation of the pigment, making the pigment color appear more vibrant; the hue value h* remained within a stable range, indicating that compared to pure pigment, the incorporation of the phosphor did not destroy the yellow hue of the pigment. Figure 1 (d) shows Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The linear graph of the chromaticity value parameters after the powder is doped with PbCrO4 pigment shows more intuitively how the pigment chromaticity value changes with the amount of phosphor added, and the chromaticity value reaches its peak when the phosphor content is 15%. Figure 2 (d) shows Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The reflectance spectrum measured after incorporating PbCrO4 pigment into the powder shows that the addition of phosphor significantly improves the reflectance of the pigment in the yellow light band. Furthermore, compared to pure pigment, the reflectance of the pigment with 15% phosphor addition is increased by 14.3%. Based on the above data comparison, it can be concluded that PbCrO4 pigment, in addition to Sr... 1.54 Ba 0.40 SiO4: 0.06Eu 2+ After the powder is incorporated, its coloring ability is significantly improved, and the effect is most significant when the incorporation ratio is 15%.

[0173] Example 6

[0174] This embodiment is to use Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ The phosphor is incorporated into the PbCrO4 inorganic yellow pigment to improve its performance. The specific steps are as follows:

[0175] This embodiment uses commercially available powder to achieve better mixing results.

[0176] Weigh Y according to the mass ratio shown in Table 11. 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The specific data for the fluorescent powder and the inorganic yellow pigment PbCrO4 are shown in Table 11 below.

[0177] Table 11. Theoretical mass ratio and actual weighing data (Note: The ratio is based on a total mass of 1g).

[0178]

[0179] (Note; Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The yellow light-emitting phosphor was prepared in the laboratory, with an average particle size of 10-15 μm; the PbCrO4 pigment had a particle size ≤1 μm and a purity ≥99.9%.

[0180] The preparation methods for the above different mass ratio schemes are all: Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The powder and PbCrO4 pigment were mixed and dissolved in 14 ml of distilled water. The mixture was ultrasonically vibrated at 36 kHz for 11 min to ensure thorough mixing. Then, it was dried at 60 °C for 2.5 h and finally ground thoroughly in a mortar to obtain the target powder with a fineness of 10–15 μm.

[0181] In this embodiment, a benchtop colorimeter is used to test the sample. The sample is pressed into a powder cake shape in a test reflective dish. Ultraviolet and visible light are used as the light source and in reflective mode to directly measure the sample. A comparative measurement mode is used to compare the parameter values ​​of the undoped phosphor and the mixed powder, thereby determining the presence of Y doping. 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The positive effect of powder on PbCrO4 yellow inorganic pigment.

[0182] The conclusion drawn from this embodiment is: Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The mixing ratio of powder to PbCrO4 yellow inorganic pigment is 15%:85%, which has the greatest impact on the colorimetric properties of the pigment. See Table 12 for details.

[0183] Table 12. Doping with different amounts of Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Test data of powdered PbCrO4 pigment

[0184] <![CDATA[Y 2.79 Al5O 12 :0.06Ce 3+ ,0.15Gd 3+ :PbCrO4]]> L* b* C* h* 1 0:100％ 75.59 64.76 68.08 72.03 2 5％：95％ 77.26 65.62 68.72 72.75 3 10％：90％ 79.28 68.97 72.21 72.21 4 15％：85％ 82.16 70.43 73.39 73.66 5 20％：80％ 80.23 69.87 72.55 72.43 6 25％：75％ 79.47 69.81 72.10 72.62 7 30％：70％ 78.33 67.68 71.10 72.16

[0185] Table 12 shows Y 2.79 Al5O 12 0.06Ce 3+0.15Gd 3+ A comparison of chromaticity parameters after incorporating PbCrO4 pigment into the powder shows that, compared to pure pigment, when the mixing ratio of phosphor to pigment is 15%:85%, the luminance value L* increases by 8.7%, indicating that Y... 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The incorporation of the phosphor significantly enhanced the color brightness of the PbCrO4 pigment, making it appear brighter; the yellowness value b* increased by 8.8%, indicating that the incorporation of the phosphor made the inorganic pigment more yellow under simulated sunlight; the color saturation value C* increased by 7.8%, indicating that the incorporation of the phosphor significantly enhanced the color saturation of the pigment, making the pigment color appear more vibrant; the hue value h* remained within a stable range, indicating that compared to pure pigment, the incorporation of the phosphor did not destroy the yellow hue of the pigment. Figure 1 (f) shows Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The linear graph of the chromaticity value parameters after the powder is doped with PbCrO4 pigment shows more intuitively how the pigment chromaticity value changes with the amount of phosphor added, and the chromaticity value reaches its peak when the phosphor content is 15%. Figure 2 (f) shows Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The reflectance spectrum measured after incorporating PbCrO4 pigment into the powder shows that the addition of phosphor significantly improves the reflectance of the pigment in the yellow light band. Furthermore, compared to pure pigment, the reflectance of the pigment with 15% phosphor addition increases by 22.10%. Based on the above data comparison, it can be concluded that PbCrO4 pigment has a high reflectance in the Y wavelength range. 2.79 Al5O 12 0.06Ce 3 + 0.15Gd 3+ After the powder is incorporated, its coloring ability is significantly improved, and the effect is most significant when the incorporation ratio is 15%.

[0186] Some explanations of the attached figures:

[0187] Figure 3 The image shows Y. 2.94 Al5O 12 0.06Ce 3+ ,Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ ,Y2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Excitation-emission spectra of phosphors, and reflectance spectra of phosphors and fluorescent pigments in a colorimeter. From Figure 3 As seen in (a,b,c), all three phosphors are excited by blue light at approximately 450–460 nm and emit yellow light in the 550–580 nm range. Among them, Y... 2.94 Al5O 12 0.06Ce 3+ Phosphor has the highest luminescence intensity, Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The emission wavelength compared to Y 2.94 Al5O 12 0.06Ce 3+ A redshift occurs, but its luminous efficiency decreases; Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ It has the lowest luminous efficiency. Figure 3 (d,e,f) and (g,h,i) are the reflectance spectra of the three phosphors at the optimal mixing ratios with BiVO4 and PbCrO4 yellow pigments, respectively. It can be clearly seen that the inclusion of fluorescent materials significantly enhances the reflectance of the yellow pigment. Combined with the improvement rate of the three phosphors on the color rendering of the inorganic yellow pigment in Examples 1-6, it can be concluded that: Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The enhancement effect of phosphor is most obvious, Y 2.94 Al5O 12 0.06Ce 3+ Secondly, Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The enhancement effect of phosphors is relatively poor. After absorbing blue light, yellow phosphors emit yellow light. On the one hand, their own body color becomes the complementary color, yellow, and on the other hand, they are strongly excited, resulting in strong yellow light emission in the yellow light region. At the same time, since yellow pigments do not absorb yellow light, the pigments produce a strong diffuse reflection of the yellow light emitted by the fluorescent material. Combined with the pigment's own characteristic of reflecting yellow light due to the absorption of blue light, the yellow light reflection capability of the pigment is significantly enhanced.

[0188] Figure 4 The image shows Y. 2.94 Al5O 12 0.06Ce3+ 、Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ SEM images of the phosphors (a, b, c, in order) and their optimal mixing ratios with BiVO4 (d, e, f) and PbCrO4 (g, h, j) pigments. It can be clearly seen that Y... 2.94 Al5O 12 0.06Ce 3+ and Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ The phosphor is in the form of spherical particles and is uniformly dispersed, with an average grain size of about 15 μm; Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The phosphor exhibits irregular, blocky particles that are uniformly dispersed, with an average grain size of approximately 15 μm. From... Figure 4 As seen in (d,e,f,g,h,j), both the pigments BiVO4 and PbCrO4 are very small in size compared to the fluorescent materials. When the large fluorescent particles are randomly distributed, most are encapsulated or partially encapsulated by numerous small pigment clusters, except for a few exposed particles.

[0189] Figure 5 The image shows the yellow fluorescent pigment BiVO4(α,γ). 2.94 Al5O 12 0.06Ce 3+ .b,Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2 + . c,Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ ) and PbCrO4(d,Y 2.94 Al5O 12 0.06Ce 3+ e,Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ . f,Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd3+ Dark-field images under 455nm excitation. It can be clearly seen that the large phosphor particles produce strong yellow light emission under 455nm blue light excitation. Due to the diffuse reflection of the yellow light by the surrounding clusters of pigment, it can also be observed in the dark. The yellow-green light observed in images (b) and (e) is from the mixed phosphor Sr. 1.54 Ba 0.40 SiO4: 0.06Eu 2+ This is caused by the emission of yellow-green light when excited by blue light.

[0190] Figure 6 The diagram illustrates the mechanism of action of yellow light-emitting fluorescent materials on yellow pigments. It shows that traditional reflective inorganic pigments achieve their yellowing effect by absorbing the blue portion of visible light and thus exhibiting their complementary color, yellow, or by reflecting yellow light. The blue light absorbed by yellow fluorescent materials serves two purposes: firstly, it makes the material itself exhibit its blue complementary color, yellow; secondly, due to blue light excitation, the fluorescent material undergoes processes such as energy absorption, transition, and re-emission of electrons in certain ion bands, ultimately emitting photons in the yellow wavelength range, thus exhibiting yellow light emission. The combination of these two materials not only increases its reflectivity but also significantly enhances its ability to produce a yellow color.

[0191] Figure 7 The diagram shows a simulated physical model of a mixture of a yellow-emitting fluorescent material and an inorganic yellow pigment. Large, irregularly shaped fluorescent particles are randomly distributed within small inorganic pigment particles. Under simulated sunlight, both exhibit strong absorption of blue light. The pigment displays its complementary color, yellow. In addition to its yellow body color, the fluorescent material, due to its strong yellow light emission, acts as a secondary light source, causing strong diffuse reflection between the pigment particles and ultimately reflecting this yellow light back to the outside world. In summary, the stimulated emission properties of the fluorescent material significantly enhance the yellow color properties of the mixture.

[0192] Figure 8 The image shows pure pigments, namely BiVO4 and PbCrO4 yellow pigments, and Y, respectively. 2.94 Al5O 12 0.06Ce 3+ Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+The L*a*b* chromaticity coordinate diagram of the mixture of three yellow light-emitting phosphors. It is clear that compared to pure yellow pigment, the luminance value L* and yellow chromaticity value b* of the fluorescent pigment are significantly improved. The degree of improvement, from lowest to highest, is as follows: Y... 2.94 Al5O 12 0.06Ce 3+ Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ The fluorescent pigment is determined by the luminescence intensity (luminescence efficiency) of the fluorescent material (quantum efficiency, in descending order, is Y). 2.94 Al5O 12 0.06Ce 3+ Y 2.79 Al5O 12 0.06Ce 3+ 0.15Gd 3+ Sr 1.54 Ba 0.40 SiO4: 0.06Eu 2+ This is determined by the absorption in the visible blue light region. This further proves... Figure 6 and Figure 7 The feasibility of the mechanism by which the fluorescent material acts on yellow pigments.

[0193] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. The application of phosphor in improving the color development performance of inorganic yellow pigments, characterized in that, Phosphor contains Y 3-x Al5O 12 :xCe 3+ Powder or Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ Powder; Inorganic yellow pigments contain BiVO4 or PbCrO4; The Y 3-x Al5O 12 :xCe 3+ In powder, 0.06≤x≤0.07; The Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ In powder, 0.06≤x≤0.07, 0.40≤y≤0.80; The phosphor accounts for 3-35% of the total mass of the phosphor and inorganic yellow pigment; the average particle size of the inorganic yellow pigment is ≤1μm; the average particle size of the phosphor is 10-15μm. A method for preparing a highly colorimetric inorganic yellow pigment: Inorganic yellow pigment, phosphor, and water are mixed and then sequentially dried and ground to obtain a highly colorimetric inorganic yellow pigment. The ratio of the total mass of phosphor and inorganic yellow pigment to water is 1.0000~1.1000g:5~15ml. The mixing is carried out under ultrasonic vibration conditions, with an ultrasonic frequency of 28~40KHz and a time of 5~15min. The drying temperature is 50~90℃, and the drying time is 1~3h. The grinding fineness is ≤15μm.

2. A highly colorimetric inorganic yellow pigment, characterized in that, It is composed of phosphor and inorganic yellow pigment, the phosphor containing Y 3-x Al5O 12 :xCe 3+ Powder or Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ Powder; Inorganic yellow pigments contain BiVO4 or PbCrO4; The Y 3-x Al5O 12 :xCe 3+ In powder, 0.04≤x≤0.08; The Y (3-x-y) Al5O 12 :xCe 3+ yGd 3+ In powder, 0.04≤x≤0.08, 0≤y≤1.20; The average particle size of inorganic yellow pigments is ≤1μm; the average particle size of phosphors is 10~15μm.

Images