A YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell thermal barrier coating fluorescent temperature probe and its preparation method
By preparing Er3+/Yb3+ co-doped YTaO4 core-shell structures and using homogeneous YTaO4 shells to coat the core material, the problems of interface defects and non-radiative energy loss in rare earth-doped fluorescent materials under high-temperature environments were solved, achieving efficient fluorescence temperature sensing and thermal barrier performance, suitable for temperature monitoring in high-temperature service environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO UNIV OF SCI & TECH
- Filing Date
- 2026-05-25
- Publication Date
- 2026-07-24
AI Technical Summary
Existing rare-earth-doped fluorescent thermosensitive materials suffer from increased interface defects and non-radiative energy loss due to problems such as lattice mismatch, differences in thermal expansion coefficients, and high phonon energy coupling at heterogeneous interfaces under high-temperature conditions, resulting in decreased fluorescent thermal stability.
Er3+/Yb3+ co-doped YTaO4 core-shell structures were prepared using the Pechini sol-gel method. The core material was coated with a homogeneous YTaO4 shell. By reducing the surface defect density and interfacial nonradiative relaxation, the core-shell structure was constructed to improve luminescence efficiency and high-temperature stability.
It significantly improves the luminescence efficiency and fluorescence lifetime of the material, enhances the stability and accuracy of high-temperature sensing, and is suitable for online temperature monitoring in high-temperature service environments such as aero-engines.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of ceramic material preparation and luminescence technology, specifically relating to a core-shell structure YTaO4:Er 3+ / Yb 3+ @YTaO4 thermal barrier coated fluorescent temperature probe material and its preparation method. Background Technology
[0002] Temperature sensing technology transforms thermal barrier coatings (TBCs) from passive insulation components into "smart" sensing layers capable of actively reporting their own health status. During engine operation, TBC failure can lead to overheating and melting of the underlying metal substrate. This failure is typically caused by overgrowth, sintering, or peeling of the thermally grown oxide (TGO) layer, processes closely related to temperature and time. Therefore, real-time monitoring of the internal temperature of thermally cross-sectional components is crucial for assessing coating integrity and predicting failure. Real-time temperature sensing enables early detection of localized overheating and provides a direct assessment of the severity of operating conditions, thus helping to prevent catastrophic damage.
[0003] Rare earth tantalates can be considered "natural" thermal barrier coating materials. Their unique crystal structure and atomic arrangement make them among the known thermal barrier coating ceramic materials with low thermal conductivity, and they also possess extremely high thermal stability, exhibiting no harmful phase transitions at temperatures exceeding 1500℃, breaking through the temperature "ceiling" of YSZ. Temperature changes have multifaceted effects on thermal barrier coating systems, involving factors such as thermal stress, oxidation reactions, thermally grown oxides, thermal conductivity, thermal fatigue, and interfacial bonding performance.
[0004] The core-shell structure effectively addresses the problem of high-temperature quenching. Composed of an inner core and an outer shell, its multi-layered design allows for the integration of multiple functions, such as temperature measurement, imaging, drug delivery, and even catalysis, into a single nanoparticle, making it a multifunctional composite "integrated body." It holds significant application value in rare-earth fluorescent thermosensitive materials. The outer shell acts as a physical isolation and protection for the inner core, with the outermost inert shell acting as a "protective shield" to isolate external quenching factors such as high temperatures and surface defects, protecting the stability of the luminescent centers within the core and effectively improving the luminescence efficiency of the material. Furthermore, the multi-layered shell structure allows for the control of energy at the interface and external environment. By layering different rare-earth ions within the core and shell, the energy transfer path can be precisely controlled.
[0005] Currently, some rare-earth-doped fluorescent thermosensitive materials employ heterogeneous shells such as ZrO2, SiO2, and Al2O3 for surface coating. While this can reduce surface defects to some extent, issues such as lattice mismatch, differences in thermal expansion coefficients, and high phonon energy coupling at the heterogeneous interface still easily lead to increased interface defects and non-radiative energy loss at high temperatures, resulting in decreased fluorescent thermal stability. Therefore, developing homogeneous core-shell thermal barrier coated fluorescent thermosensitive materials with high lattice matching and high thermal stability is of great significance.
[0006] And YTaO4:Er 3+ / Yb 3+ @YTaO4, as a core-shell structure, combines the advantages of YTaO4 with those of core-shell structures. 3+ / Yb 3+ As a core material, inert YTaO4 provides stable luminescence intensity. As a shell, it can be tightly bonded to the matrix while protecting the internal core material, thus enabling it to emit light stably.
[0007] In this patent, rare earth element Er 3+ Yb is a fluorescently activated ion, a rare earth element. 3+ Er is a fluorescence-sensitized ion, prepared using the Pechini sol-gel method. 3+ Single doping and Er 3+ / Yb 3+ Co-doped rare earth tantalates were further constructed using a "coating + low-temperature calcination" process, resulting in YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell structured materials are used to enhance the optical properties and high-temperature stability of rare earth ions, thereby obtaining upconversion luminescent ceramic materials that combine thermal barrier and temperature sensing properties. Summary of the Invention
[0008] The purpose of this invention is to prepare a core-shell structured YTaO4:Er 3+ / Yb 3+ @YTaO4 thermal barrier coated fluorescent temperature probe material and its preparation method, by constructing "Er 3+ / Yb 3+ The homogeneous core-shell structure of "co-doped YTaO4 luminescent core / inert YTaO4 shell" achieves synergistic enhancement of the high-temperature luminescence stability and temperature-sensitive performance of rare earth ions.
[0009] In this invention, YTaO4:Er 3+ / Yb 3+ Nuclear materials serve as upconversion luminescence centers, Er 3+ Provides temperature-sensitive luminescent energy level transitions, Yb 3+As a sensitizer, it enhances the absorption capacity of near-infrared light at 980 nm; the outer layer of YTaO4 inert shell without rare earth ions forms a complete coating on the core material, which significantly improves the luminescence efficiency, fluorescence lifetime and high temperature sensing stability of the material by reducing the surface defect density, suppressing high-temperature non-radiative relaxation and isolating external high-temperature quenching factors.
[0010] This invention employs a homogeneous YTaO4 shell coating structure. Compared to heterogeneous shell materials such as ZrO2, SiO2, and Al2O3, the YTaO4 shell exhibits higher lattice matching and lower interfacial mismatch stress with the core material. This effectively reduces interfacial phonon coupling and the generation of interfacial defects, thereby minimizing interfacial nonradiative energy loss and improving Er under high-temperature conditions. 3+ Stability of the luminescent center.
[0011] The invention employs the Pechini sol-gel method combined with a "coating-low temperature calcination" process to construct a core-shell structure. By controlling the precursor hydrolysis rate and shell growth process, a uniform and complete YTaO4 inert shell coating is achieved, resulting in an upconversion luminescent ceramic material that combines thermal barrier properties with temperature sensing functions.
[0012] To achieve the above objectives, the present invention employs the following technical solution: YTaO4:Er was prepared using the Pechini sol-gel method. 3+ The materials used were TaCl5, Y(NO3)3·6H2O and Er(NO3)3·6H2O as raw materials, anhydrous ethanol as the reaction base liquid, PEG 10000 as the dispersant and citric acid as the complexing agent.
[0013] (1) Using a spatula, weigh out a certain amount of Ta in a molar ratio of 1:1. 5+ and RE 3+ (RE=Er, Y), citric acid, and PEG 10000.
[0014] (2) Place all the drugs into anhydrous ethanol, stir until completely dissolved and thoroughly mixed to obtain a transparent sol system.
[0015] (3) Aging and drying to obtain dry gel.
[0016] (4) Grind the dry gel into powder, calcine it in a tube furnace, and then grind it again to obtain YTaO4:Er 3+ Ceramic powder.
[0017] (5) Using the preferred YTaO4:Er 3+ Based on this, Yb 3+ As a sensitizer, YTaO4:Er was prepared again using the Pechini sol-gel method. 3+ / Yb 3+The materials used were TaCl5, Yb(NO3)3·5H2O, Y(NO3)3·6H2O and Er(NO3)3·6H2O as raw materials, anhydrous ethanol as the reaction base liquid, PEG 10000 as the dispersant and citric acid as the complexing agent.
[0018] (6) Weigh out a certain amount of Ta using a spatula according to a molar ratio of 1:1. 5+ and RE 3+ (RE=Er,Yb,Y), citric acid, and PEG 10000.
[0019] (7) Place all the drugs into anhydrous ethanol, stir until completely dissolved and thoroughly mixed to obtain a transparent sol system.
[0020] (8) Aging and drying to obtain dry gel.
[0021] (9) Grind the dry gel into powder, calcine it in a tube furnace, and then grind it again to obtain YTaO4:Er 3+ / Yb 3+ Ceramic powder.
[0022] (10) Preferred YTaO4:Er 3+ / Yb 3+ YTaO4:Er was prepared using a process of "coating + low-temperature calcination" as the core. 3+ / Yb 3+ @YTaO4 core-shell material.
[0023] (11) First, take an appropriate amount of Y(NO3)3·6H2O and place it in a vacuum drying oven to dry it and obtain dehydrated yttrium nitrate.
[0024] (12) Weigh an appropriate amount of dehydrated yttrium nitrate, add anhydrous ethanol until completely dissolved, add acetylacetone to the solution to obtain the precursor solution of Y.
[0025] (13) Weigh out an appropriate amount of tantalum pentaethoxy, add anhydrous ethanol, and stir in an ice bath until the mixture is homogeneous to obtain a Ta precursor solution.
[0026] (14) Weigh out the prepared YTaO4:Er 3+ / Yb 3+ Ceramic powder was dispersed by adding anhydrous ethanol and repeated low-frequency sonication. Then acetylacetone was added, and the supernatant was collected for later use.
[0027] (15) First, slowly add the precursor solution of Ta to the supernatant, stir magnetically, and after it is mixed evenly, slowly add the precursor solution of Y, and stir magnetically.
[0028] (16) Next, controlled hydrolysis is carried out. The hydrolysate is prepared by mixing deionized water and anhydrous ethanol in a fixed ratio and slowly added dropwise to the solution while stirring. After completion, it is left to stand at room temperature.
[0029] (17) Remove the precipitate, wash with anhydrous ethanol, and then vacuum dry to obtain a dry powder. (18) The powder was calcined at low temperature and then ground to obtain YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell material.
[0030] This invention uses YTaO4 as a matrix and Er 3+ As an activator, Yb 3+ Er was prepared as a sensitizer using the Pechini sol-gel method. 3+ Single-doped (YTaO4:Er) 3+ Er 3+ / Yb 3+ Co-doped (YTaO4:Er) 3+ / Yb 3+ The rare earth tantalate phosphor was further constructed using a "coating + low-temperature calcination" method to create YTaO4:Er 3+ / Yb 3+ The @YTaO4 core-shell structure aims to obtain upconversion luminescent ceramic fluorescent probe materials suitable for harsh high-temperature environments.
[0031] The core of this invention lies in utilizing a homogeneous inert shell of YTaO4 to react with YTaO4:Er 3+ / Yb 3+ The luminescent nucleus enables interface modulation and surface defect passivation. Since the core and shell layers have the same crystal structure and similar lattice parameters, the lattice distortion and thermal mismatch caused by the heterojunction can be significantly reduced, thereby effectively suppressing nonradiative transitions caused by surface defects, interface defects, and high phonon energies under high-temperature conditions.
[0032] Compared with traditional heterogeneous core-shell structures, the homogeneous YTaO4 core-shell structure constructed in this invention exhibits superior interfacial and thermal stability in high-temperature environments, and can maintain Er 3+ A stable fluorescence intensity ratio between thermally coupled energy levels improves the accuracy of high-temperature fluorescence thermometry and its long-term service stability.
[0033] The advantages of this invention over existing TBC luminescent ceramic materials are mainly reflected in the following aspects: (1) This invention uses Er 3+ / Yb 3+ Co-doped YTaO4 serves as the luminescent core, via Yb 3+ Sensitization enhances 980 nm near-infrared absorption and improves Er3+ Upconversion luminous efficiency is improved to achieve stable green upconversion emission.
[0034] (2) This invention is the first to construct YTaO4:Er 3+ / Yb 3+ The @YTaO4 homogeneous core-shell structure utilizes an inert YTaO4 shell without rare-earth ions to completely encapsulate the luminescent core, effectively reducing surface defects and interfacial nonradiative relaxation, and improving the material's high-temperature luminescence stability.
[0035] (3) Due to the good lattice matching relationship between the core layer and the shell layer, the interfacial thermal mismatch stress and interfacial phonon coupling can be effectively reduced, and the energy loss under high temperature environment can be reduced, thereby improving fluorescence lifetime and temperature sensing sensitivity.
[0036] (4) Compared with the uncoated sample, the upconversion luminescence intensity of the core-shell structure material prepared by the present invention is significantly improved, the fluorescence lifetime is significantly extended, and it has higher relative sensitivity and fluorescence intensity retention in the range of 300–500 K.
[0037] (5) The preparation method of the present invention is simple and reproducible. The resulting material has both thermal barrier properties and optical temperature sensing properties, and can be applied to online temperature monitoring and thermal barrier coating health status assessment in high-temperature service environments such as aero-engines and gas turbines. Attached Figure Description
[0038] Figure 1 YTaO4:Er prepared in Example 1 3+ XRD pattern of ceramic powder.
[0039] Figure 2 YTaO4:Er prepared in Example 1 3+ / Yb 3+ XRD pattern of ceramic powder.
[0040] Figure 3 YTaO4:Er prepared in Example 1 3+ / Yb 3+ XRD pattern of YTaO4 core-shell structured ceramic powder.
[0041] Figure 4 YTaO4:Er prepared in Example 1 3+ / Yb 3+ TEM image of YTaO4 core-shell structured ceramic powder.
[0042] Figure 5 YTaO4:Er prepared in Example 1 3+ / Yb 3+Upconversion emission spectrum of YTaO4 core-shell ceramic powder under 980 nm excitation.
[0043] Figure 6 YTaO4:Er prepared in Example 1 3+ / Yb 3+ CIE chromaticity diagram of the fluorescence of @YTaO4 core-shell ceramic powder under 980 nm excitation conditions.
[0044] Figure 7 YTaO4:Er prepared in Example 1 3+ / Yb 3+ Temperature-dependent upconversion emission curves of @YTaO4 core-shell ceramic powder.
[0045] Figure 8 YTaO4:Er prepared in Example 1 3+ / Yb 3+ Relative sensitivity curves of YTaO4 core-shell structured ceramic powder.
[0046] Figure 9 YTaO4:Er prepared in Example 1 3+ YTaO4:Er 3+ / Yb 3+ and YTaO4:Er 3+ / Yb 3+ Upconversion emission spectrum of the YTaO4 sample under 980 nm excitation.
[0047] Figure 10 YTaO4:Er prepared in Example 1 3+ YTaO4:Er 3+ / Yb 3+ and YTaO4:Er 3+ / Yb 3+ Fluorescence lifetime fitting curve of @YTaO4 sample under 980 nm excitation.
[0048] Figure 11 YTaO4:Er prepared in Example 1 3+ YTaO4:Er 3+ / Yb 3+ and YTaO4:Er 3+ / Yb 3+ CIE chromaticity diagram of the YTaO4 sample under 980 nm excitation.
[0049] Figure 12 YTaO4:Er prepared in Example 1 3+ YTaO4:Er 3+ / Yb 3+and YTaO4:Er 3+ / Yb 3+ Relative sensitivity curve of @YTaO4 sample under 980 nm excitation.
[0050] Figure 13 YTaO4:Er prepared in Example 1 3+ YTaO4:Er 3+ / Yb 3+ and YTaO4:Er 3+ / Yb 3+ Fluorescence intensity retention rate of @YTaO4 samples at different temperatures. Detailed Implementation
[0051] The present invention will be further described in detail below with reference to specific embodiments, but these embodiments do not limit the scope of the present invention in any way.
[0052] Example 1 A core-shell structure YTaO4:Er 3+ / Yb 3+ @YTaO4 thermal barrier coated fluorescent temperature probe and its preparation method are detailed below: To investigate Er 3+ The effect of doping amount on the upconversion luminescence properties of rare earth tantalates, maintaining RE 3+ With Ta 5+ The molar ratio is 1:1, and Er is adjusted synchronously. 3+ The doping concentration was gradually increased from 0 mol% to 0.4 mol% to investigate the optimal activator Er. 3+ Doping level.
[0053] First, TaCl5, Y(NO3)3·6H2O, and Er(NO3)3·6H2O were dissolved in anhydrous ethanol at a specific stoichiometric ratio and magnetically stirred at room temperature until completely dissolved. In the Pechini sol-gel method, citric acid monohydrate was used as a chelating agent to form a stable chelate with the metal ions, and the molar ratio of citric acid monohydrate to rare earth metal ions was selected as 4:1. After adding citric acid monohydrate, the mixture was stirred at room temperature to form a stable metal-citric acid complex. Next, 5 wt.% of PEG 10000 was added, and after stirring and mixing evenly, the solution was placed in a 50°C water bath for controlled evaporation until a viscous, translucent wet gel was formed. The wet gel was then heat-dried in a convection oven at 130°C and aged for 10 hours to obtain a reddish-brown sheet-like dry gel. Finally, the gel was ground, calcined, and then ground a second time to obtain YTaO4:Er 3+ Ceramic powder.
[0054] The prepared YTaO4:Er 3+ The material was subjected to XRD testing, and the attached material was... Figure 1 As can be seen, the diffraction peaks of the obtained product are consistent with those of the standard PDF card, indicating that the experiment successfully prepared YTaO4:Er 3+ Ceramic material, specifically M'-YTaO4.
[0055] With preferred Er 3+ Based on doping level, add sensitizer Yb 3+ YTaO4:Er was prepared using the Pechini-type sol-gel method. 3+ / Yb 3+ Ceramic powder. To investigate the sensitizer Yb 3+ The optimal doping amount for the sensitizer Yb 3+ The doping concentration was gradually increased from 0 to 25 mol.
[0056] First, appropriate stoichiometric amounts of TaCl5, Y(NO3)3·6H2O, Yb(NO3)3·5H2O, and Er(NO3)3·6H2O were dissolved in anhydrous ethanol solution and magnetically stirred at room temperature until completely dissolved. Then, citric acid monohydrate, four times the total molar amount of the metal ions, was added to the solution, and magnetic stirring continued at room temperature to form a stable metal-citric acid complex. Next, 5 wt.% of PEG 10000 was added as a crosslinking agent to undergo an esterification reaction with citric acid. Subsequent steps were the same as in
[0049] . This yielded YTaO4:Er 3+ / Yb 3+ ceramic powder From the appendix Figure 2 The XRD pattern shows that the diffraction peaks of the obtained product are consistent with those on the standard PDF card, indicating that the experiment successfully prepared YTaO4:Er 3+ / Yb 3+ The ceramic material is M'-YTaO4. The addition of the sensitizer did not change the structure of the substrate material.
[0057] YTaO4:Er with a preferred activator and sensitizer doping ratio 3+ / Yb 3+ YTaO4:Er was prepared using a process of "coating + low-temperature calcination" as the core. 3+ / Yb 3+ @YTaO4 core-shell material. The role of core-shell structure in regulating luminescence behavior is analyzed, elucidating the mechanism by which shell isolation and interface regulation enhance the high-temperature thermosensitive luminescence stability of rare-earth ions.
[0058] First, an appropriate amount of Y(NO3)3·6H2O was placed in a vacuum drying oven and dried at 120℃ for 24 hours. After drying, it was ground to obtain dehydrated yttrium nitrate. The dehydrated yttrium nitrate was weighed, and anhydrous ethanol was added. The mixture was magnetically stirred at room temperature until completely dissolved. 5 μl of acetylacetone was added to the solution, and stirring was continued to obtain a Y precursor solution. Next, pentaethoxytantalum was weighed, and anhydrous ethanol was added. The mixture was stirred in an ice bath until homogeneous to obtain a Ta precursor solution. The ratio of Y to Ta was 1:1. Then, 100 mg of the prepared YTaO4:Er... 3+ / Yb 3+ Ceramic powder was dispersed by adding anhydrous ethanol and repeatedly sonicating at low frequencies for 5 minutes at intervals. Then, 2 μl of acetylacetone was added, and the mixture was magnetically stirred at room temperature for 30 minutes. The supernatant was then collected. First, a precursor solution of Ta was slowly added dropwise to the supernatant, and the mixture was magnetically stirred at room temperature until homogeneous. Then, a precursor solution of Y was slowly added dropwise, and the mixture was magnetically stirred at room temperature. Next, controlled hydrolysis was performed. 15 ml of hydrolysate was prepared at a deionized water to anhydrous ethanol ratio of 1:50 and slowly added dropwise to the solution while stirring. After the addition was complete, the mixture was allowed to stand at room temperature for 12 hours. The precipitate was removed, washed with anhydrous ethanol, and placed in a vacuum drying oven for low-temperature vacuum drying to obtain a dry powder. The powder was then calcined at 200°C and held for 2 hours. The temperature was then increased to 850°C and held for 4 hours. After cooling, the powder was ground to obtain YTaO4:Er. 3+ / Yb 3+ @YTaO4 core-shell material.
[0059] From the appendix Figure 3 It can be seen from YTaO4:Er 3+ / Yb 3+ The surface coating of the nuclear material with YTaO4 did not affect its structure; the diffraction peaks of M'-YTaO4 showed excellent agreement with the standard PDF card, indicating that we successfully synthesized YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell material and without the introduction of other impurities.
[0060] From the appendix Figure 4 As can be seen in the high-magnification TEM image, a two-layer structure with contrasting light and dark areas is clearly visible, with the darker internal area being YTaO4:Er. 3+ / Yb 3+ The core has a high atomic density and strong electron scattering. The outer light-colored region is a YTaO4 shell with uniform thickness, approximately 5–10 nm, which completely encloses the core.
[0061] From the appendix Figure 5 It can be seen from YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell material corresponds to the green light band4 S 3 / 2 → 4 I 15 / 2 The emission intensity of the electron transition at that point is higher than that of YTaO4:Er. 3+ / Yb 3+ Ceramic powder, and corresponding to the red light band 4 F 9 / 2 → 4 I 15 / 2 The electron transitions at that point remain essentially unchanged.
[0062] From the appendix Figure 6 As can be seen, the overall color of the emitted light remains unchanged, emitting green light, with only slight changes in the color coordinates.
[0063] From the appendix Figure 7 As can be seen from the data, under 980 nm excitation, it has three characteristic emission peaks, including green light (…). 2 H 11 / 2 / 4 S 3 / 2 → 4 I 15 / 2 525 / 557 nm) and red light ( 4 F 9 / 2 → 4 I 15 / 2 The spectral position remained stable during heating (672 nm), confirming that Er... 3+ The luminescent center exhibits excellent thermal stability, and the luminescence intensity gradually decreases as the temperature increases.
[0064] From the appendix Figure 8 It can be seen that although at higher temperatures S r The value showed a moderate decrease, but YTaO4:Er 3+ / Yb 3+ The @YTaO4 core-shell structure system exhibits overall sensitivity exceeding most reported Er in the 300–500 K range. 3+ / Yb 3+ Co-doped thermosensitive fluorescent materials highlight their application potential for accurate and stable optical temperature measurement in high-temperature environments.
[0065] From the appendix Figure 9 It can be seen from YTaO4:Er 3+ and YTaO4:Er 3+ / Yb 3+ In comparison, the prepared YTaO4:Er 3+ / Yb 3 + @YTaO4 core-shell ceramic material, the upconversion luminescence intensity was increased by 336% and 12%, respectively.
[0066] From the appendix Figure 10 It can be seen from YTaO4:Er 3+ and YTaO4:Er 3+ / Yb 3+ In comparison, the prepared YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell ceramic material, fluorescence lifetime improved by 547% and 20%.
[0067] From the appendix Figure 11 It can be seen that the chromaticity coordinates of the three samples are all concentrated in the green light region and the chromaticity coordinates highly overlap. Combined with the upconversion emission spectrum, it can be seen that Er... 3+ The dominant green light emission is the primary contributor to the emitted color, while red light emission serves only as a secondary color. This indicates that Yb 3+ The sensitization and the introduction of the core-shell structure only enhanced the luminescence intensity without causing a significant change in the luminescence color.
[0068] From the appendix Figure 12 It can be seen from YTaO4:Er 3+ and YTaO4:Er 3+ / Yb 3+ In comparison, the prepared YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell ceramic material, with relative sensitivity improved by 91% and 45%.
[0069] From the appendix Figure 13 It can be seen from YTaO4:Er 3+ and YTaO4:Er 3+ / Yb 3+ In comparison, the prepared YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell ceramic material has a higher fluorescence retention rate, which proves that the core-shell structure has great application potential in fields that require materials to maintain stable luminescence under temperature fluctuations (such as high-temperature sensing, anti-counterfeiting, etc.).
Claims
1. A core-shell structured thermal barrier coating fluorescent temperature probe material, characterized in that: The material is YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell structure, with its core layer being Er 3+ and Yb 3+ Co-doped YTaO4 upconversion luminescent material; the shell is an inert YTaO4 layer; the shell coats the surface of the core layer to reduce surface defects and the impact of high-temperature nonradiative transitions on Er. 3+ The quenching effect of the luminescent center improves the upconversion luminescence intensity, high-temperature fluorescence stability, and temperature sensing sensitivity of the material.
2. The material as described in claim 1, characterized in that: The Er 3+ Doping concentration of 0.1–5 mol% Yb 3+ The doping concentration is 1–25 mol%.
3. The material as described in claim 1, characterized in that: The shell thickness is 5–10 nm.
4. The material as described in claim 1, characterized in that: The material produces green and red upconversion emission when excited at 980 nm.
5. A method for preparing a core-shell structured thermal barrier coating fluorescent temperature probe material according to any one of claims 1-4, characterized in that, include: (1) YTaO4:Er prepared by Pechini sol-gel method 3+ / Yb 3+ Nuclear materials; (2) An inert YTaO4 shell is formed on the surface of the nuclear material using a coating-low temperature calcination process; (3) YTaO4:Er was obtained after controlled hydrolysis, drying and calcination. 3+ / Yb 3+ @YTaO4 core-shell structure material.
6. The method as described in claim 5, characterized in that: The coating process is carried out by sequentially adding a Y precursor solution and a Ta precursor solution. The Y precursor solution is prepared by mixing Y(NO3)3·6H2O with anhydrous ethanol and adding acetylacetone; the Ta precursor solution is prepared by mixing pentaethoxytantalum with anhydrous ethanol and stirring thoroughly.
7. The method as described in claim 5, characterized in that: The low-temperature calcination temperature is 150–300℃, and the high-temperature calcination temperature is 700–1000℃.