Method for preparing photoluminescent material through laser thermal processing and application of photoluminescent material
By optimizing laser parameters through laser thermal processing technology, the problems of high-temperature roughening and high energy consumption in the preparation of traditional photoluminescent materials have been solved, enabling rapid and low-consumption material synthesis and pattern customization, and expanding the application of information storage and encryption.
Patent Information
- Application Number
- CN202511286557.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-10
- Publication Date
- 2026-01-20
AI Technical Summary
Traditional methods for preparing photoluminescent materials suffer from problems such as high-temperature roughening, component segregation, high energy consumption, long processing cycles, and uncontrollable morphology, which affect luminous efficiency and pattern controllability.
By employing laser thermal processing technology and optimizing laser parameters, a rapid reaction between the aluminum source and rare earth precursor is achieved to prepare SrAl2O4:Eu2+/Dy3+ (SAOED) luminescent material. The local high-temperature characteristics of the laser are utilized for in-situ synthesis and pattern customization.
It has enabled the rapid preparation of photoluminescent materials, shortened the processing time from hours to minutes, reduced energy consumption, improved processing efficiency, and broadened the application scope through patterned customization, providing a new way of information storage and encryption.
Smart Images
Figure CN121362581A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of photoluminescent materials, in particular to a method for preparing photoluminescent materials by laser thermal processing and application thereof. BACKGROUND
[0002] Photoluminescent materials are a kind of functional materials that can absorb light energy (such as ultraviolet light, visible light, etc.) and emit visible light signals. The traditional photoluminescent materials are mainly prepared by high-temperature solid-phase sintering method (sintering temperature 1400-1600℃, holding for 6-12 hours). This method has significant limitations: firstly, the overall high temperature easily leads to grain coarsening and composition segregation, reducing the luminescent efficiency; secondly, the long holding time is high in energy consumption and long in process cycle; and thirdly, the uncontrollability of high-temperature heating morphology affects the controllability of luminescent patterns. SUMMARY
[0003] The purpose of the present application is to provide a method for preparing photoluminescent materials by laser thermal processing and application thereof. The laser thermal processing technology is applied to the preparation of strontium aluminate (SAO) luminescent system. By optimizing the laser parameters, the rapid reaction of aluminum source and rare earth precursor is realized by using the local high-temperature characteristics, so as to promote the synthesis of SrAl2O4:Eu 2+ / Dy 3+ (SAOED) luminescent materials.
[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a method for preparing photoluminescent materials by laser thermal processing, comprising the following steps: Step 1, raw material preparation: SrCO3, Al2O3, Eu2O3, Dy2O3 are prepared according to the molar ratio of 1:1:0.02:0.02, and then transferred to an agate mortar. Add anhydrous ethanol and grind for 30 minutes until the mixture is uniform. Then, place it in an oven and dry at 60℃ for 4 hours; Step 2, laser thermal processing: use blade coating method to uniformly coat the dried raw materials on the quartz glass. Place the quartz glass under the CO2 laser emitter and perform laser thermal processing in air to realize in-situ preparation of laser-induced luminescent materials; Step 3, post-processing: after laser processing, use an ear cleaning ball to blow the sample surface to remove unreacted loose raw materials. Take out with tweezers to obtain laser-induced photoluminescent materials.
[0005] Preferably, in step 2, the laser focal length is fixed at 8mm.
[0006] Preferably, in step 2, the laser power ranges from 10 to 100W, and the scanning speed is 0.1-2 cm / s.
[0007] The application of a method for preparing photoluminescent materials by laser thermal processing can obtain customized patterned photoluminescent materials by regulating the laser path in step two.
[0008] The application of a method for preparing photoluminescent materials by laser thermal processing utilizes a laser system to customize a two-dimensional code on SAOED raw materials to obtain an anti-counterfeiting two-dimensional code, so that the information stored in the two-dimensional code cannot be read by a mobile phone under sunlight, and the two-dimensional code can only emit light and display after being excited by specific waveband (365 nm) light.
[0009] The technical effects of the present application are: 1. Laser processing can realize pattern customization by precise regulation of the laser path, which widens its application in reality. Meanwhile, compared with traditional processing methods, laser processing greatly shortens the processing time from hours to minutes, and has lower energy consumption, which significantly improves the processing efficiency and reduces the generation cost, and also provides a new idea for the fine preparation of photoluminescent powders.
[0010] 2. The preparation time is shortened from more than 5 hours by traditional high-temperature solid-phase method to several minutes, and the energy consumption is significantly reduced.
[0011] 3. Microstructure precise regulation: by utilizing the local high temperature and rapid cooling characteristics of laser, the crystallinity, grain boundary and surface morphology are regulated, a dendritic morphology is formed, and fine customization of patterns is realized under suitable power.
[0012] 4. The unique properties of photoluminescence are combined with the advantages of laser processing preparation, realizing a new way of information storage and encryption, which provides a new idea and scheme for the fields of anti-counterfeiting, information encryption storage, etc. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a flowchart of a method for preparing photoluminescent materials by laser thermal processing.
[0014] Figure 2 It is a sample morphology diagram.
[0015] Figure 3 It is an application diagram of fine customization of LOGO by laser thermal processing technology.
[0016] Figure 4 It is an application of fine customization of LOGO by laser thermal processing technology.
[0017] Figure 5 It is an X-ray diffraction pattern of a sample prepared by laser thermal processing.
[0018] Figure 6 It is a scanning electron microscope pattern of a sample prepared by laser thermal processing.
[0019] Figure 7 Preparation of photoluminescence spectra of samples by laser thermal processing.
[0020] Figure 8 Preparation of energy dispersive X-ray maps of samples by laser thermal processing. DETAILED DESCRIPTION
[0021] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below with reference to the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application. Example 1
[0022] A method for preparing a laser-induced photoluminescence material, comprising the following steps: Step 1, raw material preparation: SrCO3, Al2O3, Eu2O3, Dy2O3 are prepared according to a molar ratio of 1:1:0.02:0.02, the raw materials are transferred to an agate mortar, an appropriate amount of anhydrous ethanol is added, and grinding is performed for 30 minutes until the mixture is uniform, and then the mixture is placed in an oven and dried at 60°C for 4 hours; Step 2, laser thermal processing: the dried raw materials are uniformly coated on a quartz glass carrier using a blade coating method, the quartz glass is placed under a CO2 laser emitter, the laser focal length is fixed at 8 mm, and laser thermal processing is performed in air by adjusting the laser power, scanning speed and scanning path to realize in-situ preparation of the laser-induced luminescent body, the laser power ranges from 10 W, and the scanning speed ranges from 0.1 to 2 cm / s.
[0023] Step 3, post-processing: after laser processing, the sample surface is blown off using an ear cleaning ball to remove unreacted loose raw materials, and the laser-induced photoluminescence material is obtained by using tweezers.
[0024] Examples 2-7 differ from Example 1 only in the range of laser power, as shown in the following table
[0025] According to the preparation results of the laser-induced photoluminescence material, the sample morphology presents a unique texture in the medium power range, when the laser power is 15-30 W, a photoluminescence material with regular and fine porous structure is prepared; when the laser power is 35-50 W, the porous structure on the surface of the material becomes irregular due to local energy accumulation, and as the power further increases (55-100 W), the melting effect continues to increase, and the structure gradually presents the characteristics of agglomeration and thickening, and the overall presents a dendritic micro-morphology. The micro-morphology is shown in the following figure: Figure 2As shown, the parameter V is fixed at 10 mm / s, and the laser power is sequentially accumulated by 5w from the first grid 15w in the upper left.
[0026] By optimizing the laser parameters (such as power, speed, scanning path), the rapid reaction of aluminum source and rare earth precursor is realized by using its local high temperature characteristics, which promotes the synthesis of SAOED. Through the characterization methods such as SEM, XRD, PL spectrum and afterglow decay test, the structural integrity and luminescent performance of the laser processed SAO material are confirmed (such as bright blue-green long afterglow under excitation wavelength 365 nm). More importantly, the laser "direct writing" processing characteristics endow the SAO material with the ability of patterned preparation - by designing the laser scanning path of the two-dimensional code pattern, a patterned SAO luminescent device with information storage function is successfully prepared, and its application potential in the fields of anti-counterfeiting identification and intelligent sensing has been preliminarily verified. This application not only provides a new strategy for the green and efficient preparation of SAO materials, but also lays a foundation for the universal application of laser thermal processing technology in functional crystal synthesis.
[0027] The following is the specific application of the preparation method of the laser-induced photoluminescent material of the present application: 1. Pattern fine customization Laser processing can realize pattern customization by precise control of laser path. By controlling the laser power and scanning speed, the surface micro-morphology of the SAOED sample prepared by laser thermal processing can be controlled, and by exciting with 365 nm ultraviolet light, the fine customization of the luminescent LOGO can be realized, such as Figure 3 Under the parameters of V: 10 mm / s, P: 25w, fine customization and display of LOGO are realized.
[0028] 2. Laser thermal processing for preparing anti-counterfeiting two-dimensional code With the fine path control of laser, two-dimensional code customization can be realized on SAOED raw materials by using laser system. This technology realizes the application of anti-counterfeiting two-dimensional code, realizes that the information stored in the two-dimensional code cannot be read by mobile phone under daylight conditions, and only after excitation by specific waveband (365 nm) light does the two-dimensional code emit light and display, which can be read in dark conditions. This specific reading property endows the technology with the functions of anti-counterfeiting and information encryption storage, which is a new technology for information storage and encryption anti-counterfeiting.
[0029] It should be noted that in this text, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.
[0030] The principles and implementations of the present application are described herein with specific examples. The above examples are only used to help understand the method of the present application and its core idea. The above description is only the preferred embodiments of the present application. It should be pointed out that due to the limitation of language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, without departing from the principles of the present application, some improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or without improvement, the concept and technical solution of the present application are directly applied to other occasions, which should be regarded as the protection scope of the present application.
Claims
1. A method of preparing a photoluminescent material by laser thermal processing, characterized in that, Comprising the following steps: Step 1, raw material preparation: SrCO3, Al2O3, Eu2O3, Dy2O3 are prepared according to the molar ratio of 1:1:0.02:0.02, the raw materials are transferred to agate mortar, anhydrous ethanol is added, grinding for 30 minutes, until uniform mixing, then placed in an oven at 60℃ for 4 hours; Step 2, laser heat processing: the dried raw materials are uniformly coated on the carrier quartz glass by blade coating method, the quartz glass is placed under the CO2 laser emitter, and laser heat processing is carried out in air to realize in-situ preparation of laser-induced luminescent body; Step 3, post-processing: after laser processing, the sample surface is blown off using an ear cleaning ball to remove unreacted loose raw materials, and then taken out with tweezers to obtain laser-induced photoluminescent material.
2. The method of claim 1, wherein the laser thermal processing is performed by a laser beam having a wavelength of 1,064 nm. In step 2, the laser focal length is fixed at 8mm.
3. The method of claim 1, wherein the laser thermal processing is performed by a laser beam having a wavelength of 1,064 nm. In step 2, the laser power ranges from 10 to 100W, and the scanning speed is 0.1-2 cm / s.
4. Use of a method according to any one of claims 1 to 3 for the production of photoluminescent materials by laser heat treatment, characterized in that By controlling the laser path in step 2, a customized patterned photoluminescent material can be obtained.
5. Use of a method according to any one of claims 1 to 3 for the production of photoluminescent materials by laser heat treatment, characterized in that The laser system is used to customize a two-dimensional code on the SAOED raw material to obtain a security two-dimensional code, which realizes that the information stored in the two-dimensional code cannot be read by a mobile phone under daylight conditions, and only after excitation by a specific waveband (365nm) light can the two-dimensional code emit light and display.