CN113322069A - Molybdate reversible multicolor photochromic up-conversion phosphor and preparation method thereof - Google Patents
Molybdate reversible multicolor photochromic up-conversion phosphor and preparation method thereof Download PDFInfo
- Publication number
- CN113322069A CN113322069A CN202110646429.8A CN202110646429A CN113322069A CN 113322069 A CN113322069 A CN 113322069A CN 202110646429 A CN202110646429 A CN 202110646429A CN 113322069 A CN113322069 A CN 113322069A
- Authority
- CN
- China
- Prior art keywords
- molybdate
- phosphor
- gray
- blue
- light yellow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7776—Vanadates; Chromates; Molybdates; Tungstates
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
本发明公开了钼酸盐可逆多色变色光致变色上转换荧光粉及其制备方法，材料的化学式为Pb1‑xYb0.005ErxW0.05Mo0.95O4,其中，x＝0.01～0.05。将MoO3,WO3，黄色PbO,Yb2O3,Er2O3作为原料，按化学式列出的摩尔比例进行混合研磨，再利用固相法在520℃进行烧结并保温2～4小时从而制备出Pb1‑xYb0.005ErxW0.05Mo0.95O4，x＝0.01～0.05荧光粉材料。本发明具有在405纳米光照下由原始颜色浅黄色变为蓝灰色；在473纳米激光照射下由浅黄色或蓝灰色变为粉红色；在808纳米激光照射或热刺激下由或蓝灰色或粉红色变回原始浅黄色的可逆多色光致变色性能。在不同波长光照刺激下，该荧光粉呈现不同颜色，其上转换发光光谱也随颜色变化而变化，其优异的可逆变色性能可应用在信息加密，安全防伪及多比特光存储等领域上。
The invention discloses a molybdate reversible polychromatic photochromic up-conversion phosphor and a preparation method thereof. The chemical formula of the material is Pb 1-x Yb 0.005 Er x W 0.05 Mo 0.95O4 , wherein x=0.01-0.05. Using MoO3, WO3, yellow PbO, Yb2O3, Er2O3 as raw materials, mixing and grinding according to the molar ratio listed in the chemical formula, and then sintering at 520 ° C by the solid phase method and holding for 2 to 4 hours to prepare Pb 1-x Yb 0.005 Er x W 0.05 Mo 0.95O4 , x=0.01～0.05 phosphor material. The present invention has the function of changing from light yellow to blue-gray under 405-nanometer light; changing from light-yellow or blue-gray to pink under 473-nanometer laser irradiation; changing from blue-gray or pink under 808-nanometer laser irradiation or thermal stimulation Reversible polychromatic photochromic properties that change the color back to the original pale yellow. Under the stimulation of different wavelengths of light, the phosphor exhibits different colors, and its up-conversion luminescence spectrum also changes with the color change. Its excellent reversible color change performance can be applied in the fields of information encryption, security and anti-counterfeiting, and multi-bit optical storage. .
Description
Technical Field
The invention belongs to the technical field of conversion luminescence regulation and control, and particularly relates to molybdate reversible multicolor photochromic up-conversion fluorescent powder and a preparation method thereof.
Background
The photochromic phenomenon means that a certain compound A undergoes a specific reaction when being irradiated by light with a certain wavelength and intensity to obtain another product B, and the absorption/diffuse reflection spectrum of the product B is obviously changed (the color of the product B is changed) due to the difference of the structure, the valence state, the concentration of a color center and the like of the product B. And under the irradiation of light with another wavelength or under the action of heat, the product B can be restored to the form of the compound A. Such compounds, which undergo a reversible colour change under the action of light, are known as photochromic materials. Photochromic materials can be broadly classified into organic photochromic materials and inorganic photochromic materials according to their components, and among them, inorganic photochromic materials have more excellent thermal stability, longer life span of use cycle number, and coloring property by multiple cycles than organic photochromic materials and are receiving much attention. The photochromic material has potential application in a plurality of fields such as information storage, information encryption, safety anti-counterfeiting, luminous regulation and control, architectural decoration and the like.
However, since inorganic photochromic materials have been reported to have few multi-color changes, they mainly focus on the change of the shade of color, and only the change of the absorption intensity is present without significant change of the position of the characteristic absorption peak in the absorption/diffuse reflection spectrum, which greatly limits the application of the inorganic photochromic materials. Therefore, it is important to broaden the variety of photochromic color changes.
Disclosure of Invention
In order to solve the technical problems, the invention designs molybdate reversible multicolor photochromic up-conversion phosphor and a preparation method thereof, and the reversible photochromic up-conversion phosphor is light yellow, blue gray and pink under the stimulation of light with different wavelengths. The up-conversion spectrum of the fluorescent powder is changed along with the change of the color, so that the up-conversion luminescence regulation and control are realized.
In order to achieve the technical effects, the invention is realized by the following technical scheme: the molybdate reversible multicolor photochromic upconversion fluorescent powder has the following chemical formula:
Pb1-xYb0.005ErxW0.05Mo0.95O4wherein x is 0.01-0.05.
The invention also provides a preparation method of the molybdate reversible multicolor photochromic up-conversion phosphor, which comprises the following steps:
step 1: according to the chemical formula, Pb1-xYb0.005ErxW0.05Mo0.95O4Wherein, MoO3, WO3, yellow PbO, Yb2O3 and Er2O3 are weighed according to the mol ratio of 0.01-0.05, and absolute ethyl alcohol is added to be mixed and ground uniformly until the mixture is dried to obtain the mixed material.
Step 2: and (3) uniformly heating the dried mixed material to 520 ℃ in a muffle furnace for 2 hours in the air atmosphere, keeping the temperature for 2-4 hours at constant temperature, and cooling to room temperature along with the furnace to obtain the light yellow molybdate reversible multicolor photochromic upconversion fluorescent powder.
A molybdate up-conversion phosphor reversible multicolor photochromic method comprises the following steps:
1. the original light yellow molybdate up-conversion fluorescent powder is placed under light with wavelength of 405 nanometers at the concentration of 400mW/cm2The power density of (a) was irradiated for 21 minutes, and the phosphor changed from pale yellow to blue-gray. Then the fluorescent powder which has changed into blue gray is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state.
2. Putting original light yellow or blue-gray molybdate up-conversion fluorescent powder under 473 nm wavelength laser at 3W/cm2Light yellow or blue-gray phosphor turns pink when irradiated for 50 seconds. Then the fluorescent powder which has changed into pink is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state.
The color of the fluorescent powder is changed to reflect the change of a diffuse reflection spectrum, and the multi-mode reversible regulation and control of up-conversion luminescence is realized through the self-absorption effect of the material.
The invention has the beneficial effects that:
the invention provides molybdate reversible multicolor photochromic up-conversion phosphor and a preparation method thereof, which realize multicolor reversible photochromism of light yellow, blue gray and pink of the phosphor under the stimulation of light with different wavelengths. The up-conversion spectrum of the fluorescent powder is changed along with the change of the color, so that up-conversion luminescence regulation and control are realized; the photochromic color change variety is broadened.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows Pb obtained in examples 1, 2 and 3 of the present invention1-xYb0.005ErxW0.05Mo0.95O4An X-ray diffraction pattern in which X is 0.05;
FIG. 2 shows Pb obtained in examples 1, 2 and 3 of the present invention1-xYb0.005ErxW0.05Mo0.95O4Wherein x is 0.05;
FIG. 3 shows Pb obtained in examples 1, 2 and 3 of the present invention1-xYb0.005ErxW0.05Mo0.95O4A 980 nm excitation upconversion luminescence spectrum where x is 0.05;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Example 1
Pb1-xYb0.005ErxW0.05Mo0.95O4Preparing fluorescent powder:
And 2, uniformly heating the dried mixed material in a muffle furnace for 2 hours to 520 ℃ in an air atmosphere, keeping the temperature for 2-4 hours at a constant temperature, and cooling the mixture to room temperature along with the furnace to obtain the light yellow molybdate reversible multicolor photochromic upconversion fluorescent powder.
The molybdate up-conversion phosphor reversible light yellow-blue gray photochromic method comprises the following steps:
the original light yellow molybdate up-conversion fluorescent powder is placed under light with wavelength of 405 nanometers at the concentration of 400mW/cm2The power density of (a) was irradiated for 21 minutes, and the phosphor changed from pale yellow to blue-gray. Then the fluorescent powder which has changed into blue gray is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state. The light yellow and blue gray diffuse reflectance spectra are shown in FIG. 2.
The molybdate up-conversion phosphor can regulate up-conversion luminescence by reversible light yellow-blue gray photochromism:
the light yellow and blue gray colors, respectively, of the molybdate upconverted fluorescence were excited with a 980 nm laser and the change in the upconverted luminescence spectrum was measured as shown in fig. 3.
Example 2
Pb1-xYb0.005ErxW0.05Mo0.9504Preparing fluorescent powder:
And 2, uniformly heating the dried mixed material in a muffle furnace for 2 hours to 520 ℃ in an air atmosphere, keeping the temperature for 2-4 hours at a constant temperature, and cooling the mixture to room temperature along with the furnace to obtain the light yellow molybdate reversible multicolor photochromic upconversion fluorescent powder.
The molybdate up-conversion phosphor reversible light yellow/blue gray-pink-light yellow photochromic method comprises the following steps:
putting original light yellow or blue-gray molybdate up-conversion fluorescent powder under 473 nm wavelength laser at 3W/cm2Light yellow or blue-gray phosphor turns pink when irradiated for 50 seconds. Then the fluorescent powder which has changed into pink is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state. The light yellow, blue-gray and pink diffuse reflectance spectra are shown in FIG. 2.
The molybdate up-conversion phosphor can regulate up-conversion luminescence by reversible light yellow-pink photochromism:
the molybdate up-converted fluorescence was excited with a 980 nm laser and the up-converted luminescence spectrum was measured as shown in fig. 3 for light yellow/blue gray and pink, respectively.
Example 3
Pb1-xYb0.005ErxW0.05Mo0.95O4Preparing fluorescent powder:
And 2, uniformly heating the dried mixed material in a muffle furnace for 2 hours to 520 ℃ in an air atmosphere, keeping the temperature for 2-4 hours at a constant temperature, and cooling the mixture to room temperature along with the furnace to obtain the light yellow molybdate reversible multicolor photochromic upconversion fluorescent powder.
The molybdate up-conversion phosphor reversible light yellow-blue gray-pink-light yellow photochromic method comprises the following steps:
the original light yellow molybdate up-conversion fluorescent powder is placed under light with wavelength of 405 nanometers at the concentration of 400mW/cm2The power density of (a) was irradiated for 21 minutes, and the phosphor changed from pale yellow to blue-gray. Placing the blue-gray fluorescent powder under 473 nm wavelength laser at 3W/cm2The blue-gray phosphor changed to pink after being irradiated for 50 seconds. Then the fluorescent powder which has changed into pink is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state. The light yellow, blue gray and pink diffuse reflection spectrum is shown in figure 2.
The molybdate up-conversion phosphor can regulate up-conversion luminescence by reversible light yellow-blue gray-pink-light yellow photochromism:
the molybdate up-conversion phosphor was excited with 980 nm laser and measured for up-conversion luminescence spectrum change for light yellow, blue gray and pink colors, respectively, as shown in fig. 3.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. The molybdate reversible multicolor photochromic upconversion phosphor has a chemical composition formula
Pb1-xYb0.005ErxW0.05Mo0.95O4Wherein x is 0.01-0.05.
2. The preparation method of the molybdate reversible multicolor photochromic up-conversion phosphor comprises the following steps:
step 1: according to the chemical formula, Pb1-xYb0.005ErxW0.05Mo0.95O4Wherein x is 0.01-0.05, and MoO is weighed according to the molar ratio3，WO3Yellow PbO, Yb2O3，Er2O3Adding absolute ethyl alcohol, mixing and grinding uniformly until the mixture is dried to obtain a mixed material;
step 2: and (3) uniformly heating the dried mixed material to 520 ℃ in a muffle furnace for 2 hours in the air atmosphere, keeping the temperature for 2-4 hours at constant temperature, and cooling to room temperature along with the furnace to obtain the light yellow molybdate reversible multicolor photochromic upconversion fluorescent powder.
3. The method of claim 1, wherein the molybdate reversible multicolor photochromic upconversion phosphor comprises:
(1) the original light yellow molybdate up-conversion fluorescent powder is placed under light with wavelength of 405 nanometers at the concentration of 400mW/cm2The power density of (a) was irradiated for 21 minutes, and the phosphor changed from pale yellow to blue-gray. Then the fluorescent powder which has changed into blue gray is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state.
(2) The original light yellow or changed blue gray molybdate is up-converted to phosphor powder with 473 nm wavelengthUnder laser at 3W/cm2Light yellow or blue-gray phosphor turns pink when irradiated for 50 seconds. Then the fluorescent powder which has changed into pink is treated by 808 nanometer laser at the speed of 2.5W/cm2Is irradiated for 60 seconds to return to the original light yellow state.
4. The molybdate reversible multicolor photochromic up-conversion phosphor and the preparation method thereof according to claim 2 are applied to the control of conversion luminescence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110646429.8A CN113322069A (en) | 2021-06-10 | 2021-06-10 | Molybdate reversible multicolor photochromic up-conversion phosphor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110646429.8A CN113322069A (en) | 2021-06-10 | 2021-06-10 | Molybdate reversible multicolor photochromic up-conversion phosphor and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113322069A true CN113322069A (en) | 2021-08-31 |
Family
ID=77420357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110646429.8A Pending CN113322069A (en) | 2021-06-10 | 2021-06-10 | Molybdate reversible multicolor photochromic up-conversion phosphor and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113322069A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558484A (en) * | 2022-10-25 | 2023-01-03 | 扬州大学 | Photochromic material with low molybdenum content and synthesis method thereof |
| CN116925765A (en) * | 2023-07-18 | 2023-10-24 | 西华大学 | A scandium aluminate photochromic reversible upconversion luminescent phosphor material and its modulation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338194A (en) * | 2008-05-15 | 2009-01-07 | 沈阳化工学院 | A kind of rare earth red fluorescent material and preparation method thereof |
| CN102367381A (en) * | 2011-09-05 | 2012-03-07 | 四川师范大学 | Lanthanide metal doped tungsten and molybdate phosphor composition |
| US20130244357A1 (en) * | 2010-12-03 | 2013-09-19 | Jianwei Han | Red fluorescent materials and preparation methods thereof |
| CN105131950A (en) * | 2015-09-16 | 2015-12-09 | 同济大学 | Tungstate upconversion luminescence temperature sensitive material doped with rare-earth elements Er and Yb and preparation method thereof |
| CN108410461A (en) * | 2018-03-09 | 2018-08-17 | 同济大学 | A kind of complex phase tungsten hydrochlorate up-conversion luminescent material and the preparation method and application thereof |
| CN110791287A (en) * | 2019-09-27 | 2020-02-14 | 合肥学院 | Rare earth doped tungsten molybdate, preparation method and application thereof |
-
2021
- 2021-06-10 CN CN202110646429.8A patent/CN113322069A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338194A (en) * | 2008-05-15 | 2009-01-07 | 沈阳化工学院 | A kind of rare earth red fluorescent material and preparation method thereof |
| US20130244357A1 (en) * | 2010-12-03 | 2013-09-19 | Jianwei Han | Red fluorescent materials and preparation methods thereof |
| CN102367381A (en) * | 2011-09-05 | 2012-03-07 | 四川师范大学 | Lanthanide metal doped tungsten and molybdate phosphor composition |
| CN105131950A (en) * | 2015-09-16 | 2015-12-09 | 同济大学 | Tungstate upconversion luminescence temperature sensitive material doped with rare-earth elements Er and Yb and preparation method thereof |
| CN108410461A (en) * | 2018-03-09 | 2018-08-17 | 同济大学 | A kind of complex phase tungsten hydrochlorate up-conversion luminescent material and the preparation method and application thereof |
| CN110791287A (en) * | 2019-09-27 | 2020-02-14 | 合肥学院 | Rare earth doped tungsten molybdate, preparation method and application thereof |
Non-Patent Citations (3)
| Title |
|---|
| CHANG SUNG LIM等: "Upconversion Photoluminescence Properties of PbMoO4:Er3+/Yb3+ Phosphors Synthesized by Microwave Sol-Gel Method", 《KOREAN J.MATER.RES.》 * |
| N.R.AGHAMALYAN等: "Luminescent Properties of Nd3+ Ions in Pb(MoO4)x(WO4)1–x Crystals", 《JOURNAL OF CONTEMPORARY PHYSICS》 * |
| XUE BAI等: "Novel Strategy for Designing Photochromic Ceramic: Reversible Upconversion Luminescence Modification and Optical Information Storage Application in the PbWO4:Yb3+, Er3+ Photochromic Ceramic", 《ACS APPLIED MATERIALS & INTERFACES》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558484A (en) * | 2022-10-25 | 2023-01-03 | 扬州大学 | Photochromic material with low molybdenum content and synthesis method thereof |
| CN116925765A (en) * | 2023-07-18 | 2023-10-24 | 西华大学 | A scandium aluminate photochromic reversible upconversion luminescent phosphor material and its modulation method |
| CN116925765B (en) * | 2023-07-18 | 2024-05-07 | 西华大学 | Scandium aluminate photochromic reversible upconversion luminescent phosphor material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113322069A (en) | Molybdate reversible multicolor photochromic up-conversion phosphor and preparation method thereof | |
| CN107236535B (en) | A kind of niobate reversible photochromic material and preparation method and application thereof | |
| Zhang et al. | The photoluminescence, afterglow and up conversion photostimulated luminescence of Eu3+ doped Mg2SnO4 phosphors | |
| CN108913131B (en) | A kind of rare earth ion doped gallate reversible photochromic material and preparation method and application thereof | |
| Duan et al. | Blue-green tunable luminescence mechanism of a novel Tb3+ doped Cs4PbBr6 quantum dots tellurite glass | |
| Li et al. | Synthesis and color properties of neodymium–doped holmium molybdate pigments with allochroic effect | |
| Jiang et al. | Dynamic photoluminescent and photochromic properties of CaAl12O19: Eu, Tb: a novel phosphor for advanced dual-modal multicolor anticounterfeiting | |
| Tian et al. | A thermochromic luminous polyurethane based on long persistent luminescent phosphors and thermochromic pigment | |
| George et al. | Synthesis and characterization of environmentally benign calcium-doped Pr2Mo2O9 pigments: applications in coloring of plastics | |
| CN115340871A (en) | Spectrum-adjustable luminescent material at variable temperature, preparation method and anti-counterfeiting application thereof | |
| Shen et al. | Novel photo-responsive composite fibers fabricated by facile wet-spinning process for UV detection and high-level encryption | |
| WO2019196376A1 (en) | Spinel-based color-controllable up-conversion luminescent material, preparation method and application thereof | |
| CN111410531A (en) | Up-conversion luminescence reversible regulation material based on photochromic effect and preparation method thereof | |
| CN112110724B (en) | Symbiotic layered perovskite material with reversible controllability and preparation method | |
| Babkina et al. | Spectroscopic properties of chromium/antimony co-doped alkali-alumina-borate glass-ceramics | |
| CN117327489B (en) | Ce- and manganese-doped aluminosilicate fluorescent materials and preparation methods and applications thereof | |
| CN109777413B (en) | Inorganic particles with multiple photoresponse and blue long afterglow luminescence and preparation method thereof | |
| CN102329609A (en) | Temperature-sensitive color change fluorescent material and preparation method thereof | |
| CN110066173B (en) | BaMgSiO4Yb, Tb up-conversion luminescence anti-counterfeiting ceramic material, preparation method and application thereof | |
| CN115215544B (en) | A semiconductor laser-induced color-changing lead-free glass and its preparation method and application | |
| Wu et al. | Strong f–f excitation in hafnium germanate: Near‐UV LED and cathode beam–pumped red phosphor with thermal robustness | |
| CN108624316A (en) | Based on rear-earth-doped photochromic material and its preparation method and application | |
| CN116395703B (en) | A strontium silicate-based material that changes color in response to X-rays, and its preparation method and application | |
| CN114181701A (en) | A Rare Earth Doped Upconversion Luminescence Control Material | |
| JP2017048383A (en) | Fluorescent photochromic material and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210831 |