CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hongyu Lu,Yang Lu,Difan Lin,Jiang Zhu,Yangyang Du,Hua Zou
Luminescent materials usually suffer from thermal quenching at high temperature due to the aggravation of nonradiation relaxations. Herein, a giant enhancement of up conversion (UC) luminescence is observed in negative thermal expansion (NTE) Y 2 W 3 O 12 :Nd phosphor upon increasing the temperature from 310 to 790 K. In addition, the temperature-dependent UC emission is reversible. To penetrate into the mechanisms, the temperature-dependent luminescence intensity and lifetime are investigated for Nd doped negative and positive thermal expansion (PTE) phosphors. Based these investigation, we infer that the underlying mechanism of the giant enhancement for Y 2 W 3 O 12 :Nd phosphor are due to combined effects of phonon assisted absorptions and contraction of NTE crystals. Moreover, the observation of temperature-dependent near-infrared spectra (NIR) can support the mechanism from the other side. The present findings pave the way to overcome thermal quenching of Nd 3+ ions and explore new thermal enhancement materials sensitized by Nd 3+ ions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 53
·期 6
·2575-2590
·
IF 4
Yuhong Zhang,Wentong Cai,Jian Liu,Ziyi Zhang,Bo Sun,Hang Liu
Herein, a series of Y2W3O12:10%Yb3+/x%RE3+ (RE = Er/Ho/Tm) phosphors is prepared via a solid-state reaction. The upconversion and downshift luminescence properties of the phosphors were investigated under an excitation of 980 nm. The bright blue light emission from Tm3+ ion and the green and red light emissions from Ho3+(Er3+) ions were observed. The near-infrared light intensity of NIR-I (Tm3+, ∼850 nm), NIR-II (Er3+: ∼1550 nm; Tm3+: ∼1783 nm) and NIR-III (Ho3+: ∼2050 nm) were analyzed. In particular, the dramatic thermal enhancement phenomenon in visible and NIR regions was exhibited by the Y2W3O12:10%Yb3+/x%RE3+ (RE = Er/Ho/Tm) phosphors. Among them, the green light intensity of Er3+ ions increased 26.77 times, from 303 to 573 K. The NIR-II emission band (∼1783 nm) intensity of Tm3+ ions at 533 K increased 168.7 times compared to that at 313 K. The possible thermal enhancement mechanism is illustrated by the negative thermal expansion (NTE) and Frenkel defect of the Y2W3O12 host. Finally, the optical temperature sensing performances of Y2W3O12:10%Yb3+/x%RE3+ (RE = Er/Ho/Tm) samples are investigated according to the luminescence intensity dependence relationship on temperature. The maximum value of SR reached 4.24% K−1 at 353 K for Y2W3O12:10%Yb3+/0.6%Ho3+ phosphor. The results indicate that the Y2W3O12:10%Yb3+/x%RE3+ (RE = Er/Ho/Tm) phosphors possess anti-thermal quenching properties and are suitable for developing optical temperature sensors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2020
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IF 5.289
Chenguang Liu,Liming Yu,Zongqing Ma,Yongchang Liu,Chenxi Liu,Huijun Li,Hui Wang
Effects of Y 2 W 3 O 12 particle inclusions and content on damping capacity of Al–12Si composites have been investigated. The Y 2 W 3 O 12 , which is a kind of negative thermal expansion material, can generate high local strain in the composites. Thermal expansion testing shows that the coefficient of thermal expansion (CTE) of Y 2 W 3 O 12 has obvious changes between 100 and 200 °C The Y 2 W 3 O 12 /Al–12Si composites show damping peaks and display higher damping capacities than the pure Al–12Si alloy. The damping capacities of composites strongly depends on the content of Y 2 W 3 O 12 inclusions. A thermal strain damping model is also established. Based on the model analysis results, there is a significant contribution of thermal strain to the damping capacity in the composites; the change in CTE of Y 2 W 3 O 12 could cause the generation of damping peaks. Moreover, dislocation damping and interfacial damping are also main damping mechanisms in the investigated composites.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xiaoyang Wang,Xiaoqing Si,Mingshen Li,Qihan Zhou,Jianwei Gao,Chun Li,Junlei Qi,Jian Cao
Y 2 W 3 O 12 particles with negative thermal expansion (NTE) can offset the high thermal expansion of Ag-based sealants, thus relieving the residual stress of electrolyte/interconnect joints in protonic ceramic fuel cell (PCFC) stacks. Nevertheless, violent interfacial reactions between Y 2 W 3 O 12 particles and BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ electrolyte have severely restricted the application of these NTE particles. Herein, novel Y 2 W 3 O 12 @SiO 2 composite particles with a core-shell structure are successfully designed to address this conundrum. The thermal expansion coefficient of Ag-based sealant is lowered from 19.7 to 14.6 ppm/K by adding 20 wt% Y 2 W 3 O 12 @SiO 2 particles. During joining, the SiO 2 shell significantly reduces the reaction consumption of Y 2 W 3 O 12 , fully exploiting its NTE properties. Meanwhile, a tiny portion of SiO 2 participates in and regulates interfacial reactions, generating mechanically matched reaction layers. Finite element simulation demonstrates that introducing Y 2 W 3 O 12 @SiO 2 particles significantly releases the compressive X-stress near the BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ interface, thus increasing the joint strength from ∼25.3 to ∼32.4 MPa. Obtained joints maintain long-term stability in oxidizing and reducing atmospheres at 600 °C, suggesting the applicability of Y 2 W 3 O 12 @SiO 2 composite particles in fabricating PCFC stacks. Our work provides a new strategy for preparing NTE materials with controllable interfacial reactions and service capability under extreme conditions.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2026
·
IF 3.2
Defu Xu
A blue-light-excitable Y 2 W 3 O 12 :Eu FIR thermometer is developed using 466 nm excitation matched to commercial InGaN LEDs. • The negative thermal expansion effect endows the phosphor with excellent resistance to thermal quenching, retaining ∼40% of its emission at 603 K. • The thermometer achieves a maximum relative sensitivity of 0.15% K −1 , repeatability >99.3%, and low temperature uncertainty below 4.2 K from 363 to 603 K. The development of reliable and cost-effective fluorescence intensity ratio (FIR) thermometers for high-temperature environments is urgently required, yet most existing probes rely on near-infrared stimulated upconversion or ultraviolet excited downshifting, which suffer from high system complexity, optical damage, and high cost. In response to this dilemma, herein I report a blue-light-excitable FIR thermometer based on Eu 3+ -doped Y 2 W 3 O 12 (YWO) negative thermal expansion (NTE) phosphor. Under 466 nm blue excitation, the YWO:Eu phosphor exhibits efficient downshifting luminescence dominated by the 5 D 0 → 7 F 2 electric dipole transition at 612 nm, and the NTE effect endows the phosphor with excellent resistance to thermal quenching. The proposed thermometer achieves a maximum relative sensitivity of 0.15% K −1 , together with excellent repeatability (>99.3%) and low temperature uncertainty (<4.2 K) over the 363-603 K range. Also, the single-wavelength excitation strategy allows the use of a commercial blue light emitting diode (LED), eliminating the need for costly tunable lasers or dual-wavelength setups and thereby reducing system complexity and cost. These results demonstrate that the blue-light-excited YWO:Eu FIR thermometer is a promising candidate for non-contact photothermal feedback in high-temperature environments.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 7
·e20518
·
IF 3.8
Xiyuan Chen,Quanwang Niu,Peiqing Cai,Xiangfu Wang
Recent advances in inorganic negative thermal expansion (NTE) materials have highlighted their potential for multifunctional applications, yet challenges remain in optimizing their luminescent properties for practical use. Based on Y 2 W 3 O 12 :Tb 3+ /Eu 3+ NTE ceramics, we present a thermally regulated optical encoding and encryption approach. Under 254 nm UV excitation, the distinctive high-temperature thermal enhancement effect of red emission and the thermal quenching phenomenon of green emission were discovered in these ceramics, enabling an effective temperature-controlled color change phenomenon. Optical information encoding and readout were realized through the synergistic modulation effect of UV light and heat, and the encryption and decoding process of multivariate codes and alphabets at high temperatures was accomplished. The encoding was accomplished by modulating the Tb 3+ /Eu 3+ doping concentration ratio and regulating the luminescent color of the ceramics over a wide range. Furthermore, the ceramic demonstrates a wide temperature range of 363‒603 K for temperature sensing effect. This offers a research idea for achieving multifunctional ceramics of coding and temperature sensing.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）