ACS Applied Optical Materials
·
2024
·
IF 0
Zhiwei Wang,Qiuying Wang,Qin Liu,Suwit Suthirakun,Wongsathorn Kaewraung,Peng Jiang,Hang Zhao,Xin Xin,M. A. Subramanian
Blue pigments and blue glazes play crucial roles in our daily life. Ongoing research into blue pigments aims at environmentally friendly compositions with a lower cost. In this work, Co-doped BaAl2Si2O8 pigments were synthesized by a solid-state method. The blue color of the pigments is due to the 4A2(4F) → 4T1(4P) transitions allowed by doped Co2+ in the tetrahedral coordination of the structure. The pigments exhibit excellent stability under both acidic and alkaline conditions. When combined with transparent glazes, BaAl2–xCoxSi2O8 demonstrates satisfied compatibility, resulting in blue glazes with a significant reduction in Co content compared with existing formulations. Furthermore, BaAl2–xCoxSi2O8 blue glazes possess a simple production route, commendable color performance, and cost-effectiveness.
研究领域:
材料科学
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无机化学
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环境科学
✓ 已验证
DOI
OPTICAL MATERIALS
·
2024
·
IF 3.8
Zhiwei Wang,Qiuying Wang,Yi Wang,Theeranun Siritanon,M.A. Subramanian,Peng Jiang
Mg 2.2- x Co x TiO 4 (0 ≤ x ≤ 0.6) and Mg 2.2- x Cr x TiO 4 (0 ≤ x ≤ 0.6) solid solutions with spinel structure were successfully synthesized by solid-phase reaction. Excess MgO was added to achieve the single phase of the compounds. The transition metal ions Co/Cr tune the colors of Mg 2 TiO 4 to intense blue and green, respectively. The root of the observed intense blue color of Mg 2.2- x Co x TiO 4 is attributed to the 4 A 2 (F) → 4 T 1 (P) transition of Co 2+ in tetrahedral coordination. In Cr doped Mg 2 TiO 4 , Cr exists in a mixed oxidation states of +3 and + 6. The green color of the as-synthesized Mg 2.2- x Cr x TiO 4 is attributed to 4 A 2 (F) → 4 T 1 (F) at 410 nm–500 nm and 4 A 2 (F) → 4 T 2 (F) at 610 nm transitions of Cr 3+ . Besides, the Cr 3+ - Ti 4+ charge-transfer transition at 410 nm–500 nm is also the reason why it shows green. The as-synthesized pigments were dispersed into PMMA to prepare blue/green plastics.
研究领域:
材料科学
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无机化学
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颜料技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 17
·5443-5452
·
IF 4
Zhichao Meng,Yan Gao,Ji'an Song,Zelong Jiang,Wei Lv,Qingguang Zeng,Dawei Wen,Tao Hu
Mixed-valence europium-activated phosphors are receiving attention in many fields, such as lighting, anti-counterfeiting, optical recording, encryption, and temperature sensing. However, it remains difficult to construct mixed-valence europium-activated compounds due to the reductive and oxidative synthesis conditions required to obtain Eu2+ and Eu3+ ions, respectively. Herein, mixed-valence Eu2+/Eu3+ was realized in the CaBPO5 built by rigidly connected BO4 and PO4 tetrahedrons by partial Eu3+ → Eu2+ self-reduction in the air atmosphere. Commendably, the CaBPO5:Eu2+/Eu3+ phosphor exhibits excellent ratiometric temperature sensing performance with the maximum absolute and relative sensitivity being as high as 0.184 K−1 and 3.444% K−1 with good signal discriminability, due to the high and low, respectively, temperature-dependence of Eu2+ and Eu3+ emissions. The rapid dropping intensity of Eu2+ in CaBPO5 with increasing temperature was due to the small energy gap (∼0.48 eV) between the Eu2+-5d state and the conduction band. Our work not only provides a novel thermometer candidate but also enlightens researchers to a method of effectively designing new mixed-valence metal-ion activated luminescent thermometers via selective tetrahedrally coordinated rigid crystal structure.
研究领域:
材料科学
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发光材料
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无机化学
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固体化学
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传感器技术
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光学工程
·
功能材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Kunyang Cui,Qiuyu Cheng,Yuqian Wang,Lin Liu,Peng Jiang,M.A. Subramanian
The novel orange to red color Bi 24 Al 2- x Cr x O 39 (0≤ x ≤ 0.5) compounds were successfully synthesized by the solid state method. With the increase of Cr content, the colors of compounds are tuned from orange red to dark red. The X-ray diffraction patterns of all samples are indexed with cubic Bi 24 Al 2 O 39 structure with the space group of I 23. The oxidation state of Cr in the oxide is confirmed to be +4 valence by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). Based on the analysis of Cr oxidation state and UV–Visible spectrum, the red hue is due to the d-d transition of Cr 4+ in tetrahedral sites. The as-synthesized red color compounds also show excellent stability in acid and base environments.
研究领域:
无机化学
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材料科学
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2018
·Vol. 33
·期 5
·954-961
·
IF 1.671
Penghui Shi,Yan Zhang,Yuhua Li,Liujiao Bian
Both the molecular recognition and interaction of metallo-β-lactamase CcrA with l -captopril were studied by the combined use of fluorescence spectra and molecular dynamic simulation. The results showed that the binding constant was 8.89 × 10 4 L mol −1 at 296 K. Both Zn1 and Zn2 displayed tetrahedral coordination geometries in the CcrA–Lcap complex, the S atom in l -captopril displaced the nucleophilic hydroxide in apo CcrA and occupied the fourth coordination site for each ion, resulting in a competitively inhibited CcrA enzyme. Strong electrostatic interaction between the two zinc ions in CcrA and negatively charged l -captopril provided the main driving force for the binding affinity. Through a partly structural transformation from β-sheet to random coil, loop 1 (residues 24–34) completely opened the binding pocket of CcrA to allow an induced fit of the newly introduced ligand. This study may provide some valuable information for designing and developing a more tightly binding inhibitor to resist superbugs.
研究领域:
生物化学
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药理学
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分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Chen Li,Jun'an Lai,Daofu Wu,Qiang Wang,Yanjun Bai,Peng He,Kang An,Xiaosheng Tang
Metal halide with high luminescence property have emerged as the novel candidate materials for X-ray detection and imaging. However, the toxicity of some metal cations , such as Pb 2+ , limits its further widespread application. In this work, a new of lead-free pyridine manganese halide (C 5 H 6 N) 2 MnBr 4 was synthesized by the solution-processed method in room temperature . The research results show (C 5 H 6 N) 2 MnBr 4 has a typical structure of tetrahedral coordination related to d-d transition, which has a strong green emission at 520 nm with a full width at half maximum (FWHM) of 45 nm. (C 5 H 6 N) 2 MnBr 4 exhibits high photoluminescence quantum yields (PLQYs) of 59.36%, appreciable light yield of 15400 photons/MeV which is much higher than lead halide, relative short PL decay lifetime (247 μs) which is shorter than previous reported manganese halide and ultrashort RL decay time (12.24 ns). Finally, the performance of (C 5 H 6 N) 2 MnBr 4 Scintillators was verified via X-ray imaging, and clear X-ray image was obtained. (C 5 H 6 N) 2 MnBr 4 scintillators are eco-friendly and easy-synthesize while it has many superior performances: large stokes shift to reduce self-absorption of light; high PLQY to enhance scintillation performances; short decay lifetime to improve response. Thus, (C 5 H 6 N) 2 MnBr 4 shows great potential as next generation of scintillators and this work provides a new way for the preparation of simple and low-cost metal halide scintillators.
研究领域:
材料科学
·
放射学
·
光学
✓ 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）