OPTICAL MATERIALS
·
2023
·
IF 3.9
Wei Liu,Shiqing Xu,Lei Lei
Lanthanide doped Sc 2 (MoO 4 ) 3 upconversion (UC) crystals showed distinct negative thermal quenching effect, which show promising applications in the temperature sensing field. However, it is still valuable to develop novel routes to enhance the room temperature UC intensity. Herein, the UC intensity of the Yb/Er (Ho) doped Sc 2 Mo 3 O 12 crystals were significantly enhanced by doping Ca 2+ ions. The incorporation of Ca 2+ ions can break the crystal symmetry around the activators and then promote the 4f-4f transitions followed by the enhanced UC. Especially, the UC intensity of the Sc 2 Mo 3 O 12 :20Yb/1Ho/20Ca was about 100 times than that of Sc 2 Mo 3 O 12 :20Yb/1Ho phosphors. Furthermore, the thermally couple levels based temperature sensing performance was improved after doping Ca 2+ ions. Our results may promote the exploration of novel scheelite structural compounds with superior UC properties.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 4
·4769-4774
·
IF 3.83
Hongfei Liu,Chenjun Zhang,Zhiping Zhang,Xiangdong Meng,Xianghua Zeng
Orthorhombic Sc 2 Mo 3 O 12 films have been successfully prepared via spin coating technique followed by annealing at 500–750 °C. The phase composition, microstructure, morphology and negative thermal behavior of the synthesized Sc 2 Mo 3 O 12 films were investigated. XRD and XPS analysis indicate that as-deposited film is amorphous . Orthorhombic Sc 2 Mo 3 O 12 films can be prepared after post-annealing at 500–750 °C for 1 h. The crystallinity of Sc 2 Mo 3 O 12 films gradually improved with the increase of post-annealing temperature. SEM analysis shows as-deposited film is smooth and compact, and the grain size of Sc 2 Mo 3 O 12 film grows up as the post-annealing temperature increases. Variable temperature XRD analysis demonstrates that the synthesized orthorhombic Sc 2 Mo 3 O 12 films show stable thermo-chemical and anisotropic NTE property in 25–700 °C. The corresponding coefficients of thermal expansion (CTEs) of the orthorhombic Sc 2 Mo 3 O 12 film in a, b and c directions are −6.68 × 10 −6 °C −1 , 5.08 × 10 −6 °C −1 and −4.76 × 10 −6 °C −1 , respectively. The whole unit cell of the orthorhombic Sc 2 Mo 3 O 12 film shrinks and the volumetric CTE of the Sc 2 Mo 3 O 12 thin film is −6.36 × 10 −6 °C −1 , and the linear CTE is about −2.12 × 10 −6 °C −1 ( α v = 3 α l ).
研究领域:
材料科学
·
无机非金属材料
·
功能薄膜
·
热学性能
·
晶体结构
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 20
·1-13
·
IF 2.8
Liu Chen,Ji Yulong,Feng Xia,Liu Jingsong,Shen Yichun,Xia Xuerong,Wang Lixi,Zhang Qitu
Lanthanide ion-doped Sc 2 Mo 3 O 12 upconversion (UC) luminescent materials exhibit a unique negative thermal quenching phenomenon, making them highly promising for applications in fluorescence thermometry. However, the luminescence intensity of Sc 2 Mo 3 O 12 phosphor is relatively low at room temperature, so it is urgently necessary to enhance the intensity of the phosphor at room temperature. In this study, Sc 2 Mo 3 O 12 :Yb/Er/Al phosphors were synthesized via the solid-state reaction method, and the effects of Al 3+ ion doping on their phase composition and upconversion fluorescence properties were investigated by X-ray diffraction (XRD) analysis and upconversion fluorescence spectra evaluation. The results show that the incorporation of Al 3+ ions enhanced the UC intensity at room temperature and improved the fluorescence thermometry performance. The doping of Al 3+ ions disrupts the lattice symmetry and reduces the distance between sensitizer ions (Yb 3+ ) and activator ions (Er 3+ ), increasing the UC intensity by approximately 4.2 times. In addition, the dependence of fluorescence properties of ScAl 0.6 Mo 3 O 12 :18%Yb 3+ /2%Er 3+ samples on temperature were tested, the negative thermal quenching effect was verified, and the thermal enhancement mechanism was explored. The maximum absolute and relative sensitivities of the ScAl 0.6 Mo 3 O 12 :18%Yb 3+ /2%Er 3+ reached 0.00635 K −1 at 372 K and 0.00829%K −1 at 300 K, respectively, indicating the potential of the phosphor for applications in optical thermometry.
研究领域:
材料科学
·
光学测温
·
固态物理
·
发光材料
·
掺杂技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 20
·30135-30143
·
IF 5.532
Zhiping Zhang,Haodong Tian,Chenjun Zhang,Yuxue Zhou,Wei Wang,Xiangdong Meng,Hongfei Liu
In this work, Sc 2 Mo 3 O 12 has been synthesized via one-pot hydrothermal reaction . The effects of process conditions on the crystal structure, morphology, photocatalytic activity and negative thermal expansion (NTE) behaviors of flower-like Sc 2 Mo 3 O 12 were systematically investigated. Results indicate that orthorhombic flower-like Sc 2 Mo 3 O 12 assembled by nano-size flaky crystal grains can be synthesized by one-pot hydrothermal reaction at a temperature as low as 120 °C for 2 h. The hydrothermal reaction temperature and time have no obvious effects on the crystal structure and morphology. However, the photocatalytic property of synthesized Sc 2 Mo 3 O 12 is sensitive to the above parameters. The sample synthesized at 200 °C for 2 h shows the best photocatalytic degradation of methyl orange, and the degradation rate is 73.32% in 2 h 1 The coefficient of thermal expansion (CTE) of Sc 2 Mo 3 O 12 is −1.99 × 10 −6 °C −1 in 50–500 °C tested using TMA. The high-temperature XRD analysis reveals that Sc 2 Mo 3 O 12 exhibits anisotropic NTE and the intrinsic CTE is measured to be −2.09 × 10 −6 °C −1 in 25–800 °C.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
光催化
·
热性能
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Yujie Liang,Ruoshan Lei,Yun He,Shilong Zhao,Feifei Huang,Lei Lei
To develop novel luminescent materials with optical thermometry and anti-counterfeiting functionalities, this work designed, prepared, and characterized a series of Sc 2 Mo 3 O 12 : Eu 3+ (SMOE) phosphors and SMOE/g-C 3 N 4 composites. Structural and optical analyses reveal that SMOE exhibits two-dimensional negative thermal expansion (NTE) behavior and high resistance to luminescence concentration quenching. Via vapor deposition, g-C 3 N 4 was deposited onto SMOE particles, slightly enhancing their NTE performance. Upon UV excitation, SMOE/g-C 3 N 4 shows dual-emission characteristics featuring blue luminescence from g-C 3 N 4 and red-orange emissions from Eu 3+ , with different dependencies on excitation wavelength. Additionally, the g-C 3 N 4 emission band undergoes spectral narrowing and fast thermal quenching with increasing temperature, in contrast to the relatively stable Eu 3+ emissions. These divergent thermal responses enable five independent thermometric parameters (luminescence intensity ratios, spectral bandwidth, and individual emission intensities) to exhibit linear temperature dependence. A multi-parameter sensing strategy based on a multiple linear regression model yields a maximal relative sensitivity of an exceptional 30%/K, surpassing single-parameter approaches and outperforming most previously reported optical thermometers. Moreover, SMOE/g-C 3 N 4 is proved to be highly suitable for anti-counterfeiting labels, as its luminescence color can be switched by controlling the excitation conditions. Overall, SMOE/g-C 3 N 4 is a highly promising dual-functional material coupled with excellent thermal sensing and anti-counterfeiting capabilities.
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DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 41
·8044-8058
·
IF 3.849
Bei Zhao,Li Yuan,Shanshan Hu,Xuemei Zhang,Xianju Zhou,Jianfeng Tang,Jun Yang
Novel chocolate-like scandium molybdate precursors with exposed {001} facets were hydrothermally synthesized in the presence of PVP, which were transformed into morphology-preserved Sc2Mo3O12 crystals by calcination at 800 °C for 2 h. The as-synthesized samples were characterized by XRD, FT-IR SEM, TEM, HRTEM, and PL analysis. Four different types of precursors including prismatic structures, octahedra, truncated octahedra and compressed decahedra could be obtained by varying the amount of MoO42−. Moreover, in the presence of H+, the percentage of high-energy {001} facets could be enhanced. The Mo sources, PVP consumption, reaction time and hydrothermal temperature had significant influences on the morphology of the precursors. As good matrix materials, the tunable down/upconversion (DC/UC) luminescence properties of Sc2Mo3O12:Ln3+ (Ln = Tb, Eu, Tb/Eu, Yb/Er, Yb/Ho, Yb/Tm) were comprehensively investigated. It is found that the materials showed strong morphology-dependent luminescence properties. Particularly, the energy transfer (ET) of MoO42− → Tb3+ → Eu3+ resulted in multicolor emissions from green to red in Sc2Mo3O12:5%Tb3+,x%Eu3+. The Sc2Mo3O12:Ln3+ (Ln = Tb, Eu, Tb/Eu, Yb/Er, Yb/Ho, Yb/Tm) microcrystals show great potential applications in the areas of fluorescent lamps and color displays.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2025
·
IF 7.4
Chen Haisheng,An Yu,Wang Yinghan,Du Xiaona,Hu Minghao,Bai Gongxun,Ye Shi,Liu Weiwei,Zhang Yang
Thermal quenching, a pervasive challenge in luminescent materials, severely limits the performance of lanthanide-based optical sensors at elevated temperatures. While negative thermal expansion (NTE) hosts have shown promise in bulk systems for countering this effect, their potential in thin-film architectures, critically for integrated photonics and miniaturized sensing, remains unexplored. Here, we demonstrate a Yb 3+ /Er 3+ co-doped Sc 2 Mo 3 O 12 thin film that leverages anisotropic NTE dynamics to achieve 42-fold thermal enhancement in green upconversion luminescence from 300 to 560 K. In situ thermodiffraction and time-resolved spectroscopy reveal a dual mechanism: (1) lattice contraction along the a - and c -axes reduces the cell volume of Sc 2 Mo 3 O 12 by 11.3 Å 3 , thereby amplifying Förster-type energy transfer ( k ET ∝ R −6 ) from Yb 3+ to Er 3+ , and (2) symmetry-breaking distortions suppress nonradiative 2 H 11/2 → 4 F 9/2 relaxations, extending Er 3+ lifetimes by 358%. Crucially, the film’s strain-engineered crystal field enables multi-modal thermometry with record sensitivities: a relative sensitivity ( S r ) of 4.33% K −1 at 300 K, and maximum S r = 1.28% K −1 through lifetime-based sensing, which outperforms conventional Boltzmann-limited approaches. The sub-200 nm thickness and SiO 2 /Si compatibility further position this platform for on-chip integration, addressing unmet needs in high-resolution thermal mapping for quantum devices, aerospace diagnostics, and wearable sensors. This work not only deciphers the interplay between NTE and luminescence at the atomic scale but also establishes a universal strategy to design anti-thermal-quenching thin films for extreme-environment photonics.
研究领域:
材料科学
·
光学
·
传感器技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 11
·9211-9222
·
IF 3.277
Bei Zhao,Li Yuan,Shanshan Hu,Xuemei Zhang,Xianju Zhou,Jianfeng Tang,Jun Yang
Novel Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors have been synthesized via a one-step hydrothermal route using glycine (Gly) as a surfactant. The phosphors were characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and luminescence decays. It was found that various surfactants had a profound influence on the crystal phase, morphology and emission intensity of the final products. Furthermore, the photoluminescence of Ln3+-doped Sc2Mo3O12 phosphors (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) was studied in detail. The energy transfer of MoO42− → Tb3+ (Dy3+) → Eu3+ and multicolor tunable emission occurred by changing the ratio of Tb3+/Eu3+ or Dy3+/Eu3+ under single wavelength excitation. Moreover, the energy transfer mechanism from Tb3+ (Dy3+) to Eu3+ was ascribed to dipole–dipole interactions and the energy transfer efficiency from Tb3+ to Eu3+ (95.3%) was higher than that from Dy3+ to Eu3+ (87.5%). Their tunable multicolor luminescence properties make Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors suitable for many potential applications in the fields of color displays and fluorescent lamps.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Ziying Wang,Xinyu Li,Sihan Yang,Xuejiao Wang,Ji-Guang Li
The development of upconversion (UC) luminescent materials with negative thermal expansion (NTE) is of great importance to achieve high-performance temperature sensing. However, simultaneously enhancing UC luminescence and moisture resistance to overcome performance limitations remains a major challenge. In this work, an aliovalent cation substitution strategy is designed in which (NaMg)3+, (KMg)3+, and (RbMg)3+ are used to replace the Sc3+ in Sc2Mo3O12: Yb, Er phosphor, leading to significant structure transformation and remarkable enhancement in luminescence and moisture resistance. Among them, NaMgScMo3O12: Yb, Er exhibited a 29-fold enhancement in emission intensity and an increase in the water contact angle from 22.15° to 29.25°. Due to the efficient energy transfer induced by NTE effect, the emission intensity of NaMgScMo3O12: Yb, Er is 17 times higher than that of Sc2Mo3O12:Yb, Er at 548 K. The temperature sensing capability of NaMgScMo3O12: Yb, Er is investigated using the fluorescence intensity ratio (FIR) technique, revealing a maximum relative sensitivity (SR) of 1.17% K–1 (323 K). Furthermore, a superhydrophobic flexible film (water contact angle of 134.68°) temperature sensor is fabricated for monitoring ceramic heating element, achieving a low temperature uncertainty of 0.23–1.12 K. This work provides an approach for temperature sensing with NTE luminescent materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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