JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Le Han,Jiaqiang Liu,Peng Liu,Bohan Li,Xianliang Li,Yan Xu
Ratiometric fluorescent sensing materials based on dual-emissive luminescent centers have been widely researched due to their highly stable self-calibrating monitoring performance. In this work, Eu 3+ , Tb 3+ co-doped gadolinium molybdate [Gd 2 (MoO 4 ) 3 ] phosphors were successfully prepared through a facile precipitation and a following heat treatment process. Dual-emissive Gd 2 (MoO 4 ) 3 : Eu 3+ , Tb 3+ phosphor showed characteristic emission peaks at 592, 617, and 703 nm corresponding to the transitions of 5 D 0 – 7 F 1 , 5 D 0 – 7 F 2 and 5 D 0 – 7 F 4 for Eu 3+ ions, and the other emissions at 488 and 543 nm were ascribed to 5 D 4 – 7 F 6 and 5 D 4 – 7 F 5 transitions for Tb 3+ , respectively. The temperature sensitivities of Gd 2 (MoO 4 ) 3 : Eu 3+ , Tb 3+ based on a multimode fluorescence intensity ratio (FIR) technique were investigated for monitoring temperature changes in the range of 80–450 K. The maximum relative sensitivities of the four modes of FIR (I Tb 3+ /I Eu 3+ ) techniques were successfully achieved with range of 0.37–0.50% K −1 . The results also demonstrated the high reversibility of Gd 2 (MoO 4 ) 3 : Eu 3+ , Tb 3+ phosphor used as a self-calibrating thermometer for thermal-sensing application.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
·
2021
·Vol. 78
·期 9
·796-802
·
IF 0.649
Wang Yunfeng,Chen Jun,Wei Xiaoyu,Cui Shaobo,Jia Xiao
Rare-earth-doped upconverison luminescent (UCL) materials have wide application prospects in the field of nanoptoelectronics technology. However, achieving highly efficient UCL materials is still a big challenge due to the serious nonradiative energy loss in the host materials. In this research, Gd 2 (WO 4 ) 3 : Yb 3+ , Er 3+ inverse opal photonic crystals (IOPCs) were prepared using a polymethylmethacrylate (PMMA) template-assisted method, and the effects of modulations of the IOPC structure on UC emission properties of Er 3+ were investigated systemically. As a result, the emission intensity of 2 H 11/2 - 4 I 15/2 in IOPC was found to be suppressed 37.4%, and the radiative lifetimes of 4 S 3/2 - 4 I 15/2 were prolonged 1.55 times. The effects of the doping concentration on the reciprocal of fluorescence lifetimes of 4 S 3/2 - 4 I 15/2 between the IOPC and the reference (REF) samples showed that the cross-energy transfer (CET) rate and the electronic transition rate were greatly inhibited, which could be due to the effect of the modulation of the effective index on the radiative transition rate and on the decrease of nonradiative transition rate caused by periodic thin-walled structure of IOPC. The power-dependent UC emission properties validated the supposition that the IOPC structure could be effectively suppressed the local thermal effect and thermal quenching. This research presents a further step in the exploration of the new kind of UCL materials with high luminous efficiency.
研究领域:
材料科学
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光学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 7
·2197-2205
·
IF 7
Siyu Guo,Ligan Ma,Muniran Abudureyimu,Rongfei Wei,Fumin Lu,Fangfang Hu,Hai Guo
Near-infrared (NIR) spectroscopy has garnered substantial attention owing to its diverse merits and widespread applications. Meanwhile developing phosphors with broadband and efficient NIR emission is still an enormous challenge for constructing NIR light sources. Herein, enhanced and broadened NIR luminescence of Gd2−xAlxGaSbO7 (G2−xAxGSO):y%Cr3+ phosphors can be realized via modifying the crystal field environment of Cr3+ induced by Al3+ → Gd3+ cation substitution. Upon blue light irradiation, G1.4A0.6GSO:4%Cr3+ exhibits a broadband luminescence ranging from 650 to 1000 nm with a full width at half maximum (FWHM) of 136 nm, excellent thermal stability, and a tiny chromaticity shift. Through incorporating the resulting powders into a blue light-emitting diode (LED) chip, a NIR phosphor-converted (pc) LED with a high output power of 62.99 mW and a photoelectric conversion efficiency of 13.38% was manufactured. The fabricated pc-LED shows application potential in nondestructive food analysis. These findings confirm that the as-synthesized G2−xAxGSO:Cr3+ phosphor is a promising candidate for application in NIR pc-LEDs.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
POLYHEDRON
·
2022
·
IF 2.975
Na Qiao,Xiao-Xiao Li,Ying Chen,Xiao-Yan Xin,Chen Yang,Shan-Shan Dong,Yan-Zi Wang,Xing-Jin Li,Yu-Peng Hua,Wen-Min Wang
Three dinuclear Ln 2 compounds, [Ln 2 (dbm) 4 (L - ) 2 ]·4CH 3 CN (Ln = Gd ( 1 ), Tb ( 2 ), Dy ( 3 ), HL = (E)-N'-(2-hydroxybenzylidene)benzohydrazide and dbm = dibenzoylmethane), have been obtained by a solvent evaporation method. The structural analyses indicate that the three Ln 2 compounds (Gd 2 , Tb 2 and Dy 2 ) are isostructural with a Ln 2 O 2 center. Magnetic investigations show the presence of magnetic refrigeration in the Gd-based compound with a -ΔS m value of 17.62 J kg −1 K −1 ( T = 2.0 K and Δ H = 7.0 T); for compound 3 , however, single-molecular magnet behavior (SMM) was observed ( U eff /k B = 0.84 K and τ 0 = 1.08 × 10 −5 s).
研究领域:
化学
·
材料科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 28
·10537-10546
·
IF 4.052
Guofeng Liu,Yeqing Chen,Mochen Jia,Zhen Sun,Binbin Ding,Shuai Shao,Fan Jiang,Zuoling Fu,Ping'an Ma,Jun Lin
Rare earth ion-doped fluoride upconversion nanoparticles (UCNPs), emerging as a novel class of probes and drug carriers, exhibit superior promise for bio-applications in diagnostics and treatment on account of their strong luminescence, fine biocompatibility, and high drug loading. However, the fine control and manipulation of particle size and the distribution of rare earth ion-doped oxides has remained an insurmountable challenge to date. In this work, we construct and synthesize silica-coated Gd2(WO4)3:Yb3+/Ho3+ nanoparticles by one-pot co-precipitation, with uniform distribution (∼130 nm) and enhanced yellow fluorescence. Particularly, the nanoparticles not only possess outstanding temperature sensing performance at biological temperatures in water by utilizing the fluorescence intensity ratio (FIR) method, but also allow a further serviceable contrast effect in vitro and in vivo based on the prominent T1-weighted magnetic resonance (MR) signal of Gd3+. Compared with cisplatin and platinum(IV) (DSP), the Gd2(WO4)3@SiO2 nanoparticles functionalized with DSP (Gd2(WO4)3@SiO2-Pt-PEG) exert higher lethality against CT26 cells and significantly inhibit the growth of tumors at the same concentration of Pt. This effect occurs through the greater level of cell endocytosis. The lethality value of the latter is 10 times higher than the former after the same length of time according to inductively coupled plasma-mass spectrometry (ICP-MS) results. In short, the monodisperse and strongly fluorescent Gd2(WO4)3@SiO2-Pt-PEG nanoparticles are endowed with dual-mode imaging, temperature sensing and anticancer functions, which provide a significant guide for synthesis and bio-application of lanthanide ion-doped oxides.
研究领域:
生物医学工程
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纳米医学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 7
·2548
·
IF 3.4
Nailing Qin,Yehai Pang,Zhengbing Xu,Xiyong Chen,Jialin Yan
Double-layered manganites are natural superlattices with low thermal conductivity, which is of importance for potential thermoelectric applications. The Gd2−2xSr1+2xMn2O7(x= 0.5; 0.625; 0.75) were prepared by the solid-state reaction method. All the samples crystallize in the tetragonal I4/mmm Sr3Ti2O7type structure. The unit cell volume and the distortion in the MnO6octahedra increase with increasing Gd content. Their thermoelectric properties were investigated between 300 and 1200 K. All exhibit ann-type semiconducting behavior. The electrical conductivity (σ) increases while the absolute value of the Seebeck coefficient (|S|) decreases with increasing Gd content. Simultaneous increases inσand |S| with increasing temperature are observed at temperatures approximately higher than 600 K, and the power factor reaches a maximum value of 18.36 μW/(m K²) forx= 0.75 at 1200 K. The thermal conductivity (κ) is lower than 2 W/(m K) over the temperature range of 300–1000 K for all the samples and a maximum dimensionless figure of meritZTof 0.01 is obtained forx= 0.75 at 1000 K.Keywords:double-layered manganites;crystal structure;thermoelectric properties;n-type perovskite oxides
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
CORROSION SCIENCE
·
2026
·
IF 10.3
Changli Fu,Donald B. Dingwell,Hairong Mao,Pengfei Wei,Wenjia Song
Gd 2-x Zr 2+x O 7+x/2 ceramics were used to determine how nonstoichiometry in ceramic phases governs CMAS corrosion. All compositions retained a fluorite average structure, but Raman spectroscopy, sintering behaviour and grain growth revealed composition-dependent non-stoichiometry-driven disorder before CMAS contact. During heating, characteristic CMAS spreading temperatures depended only slightly on nonstoichiometric composition, whereas spreading rate and final spreading extent vary markedly with nonstoichiometry. After exposure at 1300 °C, all samples developed a dense inner layer and a fully reacted layer, following approximately linear and square-root time dependences of layer thicknesses, respectively. All nonstoichiometric ceramic compositions outperformed the stoichiometric composition, but the mechanistic origins of these effects were distinctly different depending on the type of nonstoichiometry, defined by different reaction products and layer-specific chemical partitioning. CMAS resistance is therefore strongly influenced by how nonstoichiometry directs competition between corrosion layers.
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DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Jianjun Zeng,Kuibao Zhang,Daimeng Chen,Ting Deng,Haiyan Guo,Baozhu Luo
In this work, Gd 2+x Zr 2 O 7+3x/2 (x = 0.1–0.6) transparent ceramics with high transmittance were prepared via vacuum sintering of nano powders (about 40 nm) synthesized by combustion method. The characterization results show that all powders are in defective fluorite structure, while the phase of ceramics change from ordered pyrochlore to disordered defective fluorite with the increase of Gd content. Excess Gd leads to lattice expansion, which makes the X-ray diffraction peaks of powders and ceramics shift to lower angle. Besides, there are pores in grain boundary and grain interior, and the main fracture mode exhibits typical transgranular fracture . The transmittance firstly increases and then decreases with the promotion of Gd content, and the Gd 2.4 Zr 2 O 7.6 ceramic reach a highest in-line transmittance of 80% in the near-infrared range.
研究领域:
材料科学
·
无机化学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Weiwei Li,Kuibao Zhang,Wenwen Zhao,Dayan Xie,Baozhu Luo,Haibin Zhang
In this study, transparent Gd 2-x Nd x Zr 2 O 7 (x = 0.4–2.0) ceramics were successfully prepared by vacuum sintering using combustion synthesized nanopowders . The original powders demonstrate a single-phase defect fluorite structure, which transforms into pyrochlore structure after sintering at high temperature. All the ceramics exhibit excellent optical performance in the range of 1000–2000 nm and the highest transmittance can reach to 78% at 1000 nm when x = 0.4. Under the excitation of 808 nm laser pumping, the samples achieve an upconversion emission peak of green light centered at 520 nm and a near infrared emission peak at 1067 nm.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xianchang Ning,Yuting Wu,Yusheng Xu,Zhenbeina Deng,Tianyu Guo,Minghui Su,Dacheng Zhou,Qi Wang,Jianbei Qiu
Multimodal temperature sensing minimizes environmental interference through cross-validation by integrating both upconversion (UC) and downconversion (DC) modalities and exploiting differences in the thermal responses of emissive transitions in a single activator center. Er 3+ -doped Gd 2 (WO 4 ) 3 phosphors were synthesized via a high-temperature solid-state reaction. This material nables multimodal self-calibrating temperature sensing based on both DC and UC luminescence and exhibits excellent resistance to thermal quenching. Notably, under 360 nm excitation (DC mode), the 530 nm emission maintained 96% of its intensity from 313 to 493 K, and under 980 nm excitation (UC mode) it remained within ±5% from 313 to 573 K. Additionally, the 824 nm emission (under 980 nm excitation) exhibited a 3.37-fold enhancement from 313 to 573 K, attributed to thermally activated cross-relaxation (CR). We also explored a multimodal self-calibrating temperature sensing system using fluorescence intensity ratio (FIR) techniques, employing the I 530 /I 551 ratio in the DC mode and the I 824 /I 551 ratio in the UC mode. Notably, the I 824 /I 551 ratio achieved a maximum relative sensitivity (S r ) of 2.21% K -1 at 313 K. A dual-mode temperature fusion platform was developed by integrating DC and UC channels. In this scheme, the multimodal FIR strategy synergistically minimizes systematic errors through cross-validation while enhancing reliability by combining thermal-quenching resistance and thermally activated emission. This work establishes a novel dual-mode material system framework for high-accuracy optical thermometry.
研究领域:
光学测温
·
功能材料
·
发光材料
·
生物医学传感
·
分子探针
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
IET Nanobiotechnology
·
2020
·Vol. 14
·期 5
·347-356
·
IF 1.859
Mei Yang,Qingyuan Gui,Jinlei Ma,Lei Qi,Bijun Bao,Yida Huang
In this study, Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) upconversion nanotubes (UCNTs) were synthesised by using Gd(OH) 3 :Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) nanotubes as the template. The luminescent and biological properties of Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) UCNTs, along with photodynamic therapy (PDT) applications of the Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 (chlorin e6) nanocomposites, were systematically studied. The resultant UCNTs showed excellent biocompatibility with human retinal pigment cells (ARPE-19) even after a prolonged incubation time of 72 h, and could be used as luminescent probes. Microscopic imaging revealed that the UCNTs existed mainly in cytoplasm. PDT studies on the Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 nanocomposites indicate that the growth of the tumour (cell) could be inhibited dramatically when it was injected (incubated) with Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 nanocomposites under the irradiation of 980 nm laser.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Haoyue Hao,Hongyu Lu,Guanghong Ao,Yinglin Song,Yuxiao Wang,Xueru Zhang
The nearly pure green and red emissions of Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 were realized by tri-doping Eu 3+ and Ce 3+ , respectively. The Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 powder, radiating intense green and red emissions, was prepared by a typical sol-gel method. Under the excitation of 980 nm laser, the red-to-green ratio was tuned from 0.2 to 4 as the concentration of Eu 3+ changed from 6 to 0 mol%, attributed to the energy transfer processes between Ho 3+ and Eu 3+ . Meanwhile, the red-to-green ratio altered from 4 to 20 as the concentration of Ce 3+ changed from 0 to 20 mol% via the cross relaxing processes between Ho 3+ and Ce 3+ . The prepared phosphors, possessing large tuning range of red-to-green ratio and resisting high temperature, can be potentially applied to colorful display and solid-state lighting.
研究领域:
材料科学
·
光学材料
·
光子学
·
固态照明
·
显示技术
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DOI
高影响因子
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