JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Weijun Gui,Mingzhe Du,Xianmin Zhang,Miroslav Almáši,Lijia Wan,Lu Gan,Zhenxi Wang,Suhang Wu
The limited luminescence efficiency and poor stability of lanthanide-based metal-organic frameworks (Ln-MOFs) are the key factors restricting their practical applications. It is well known that high-temperature annealing can significantly enhance the photoelectric properties of inorganic materials, but it seems unfeasible for Ln-MOFs due to the existence of organic components. To overcome this dilemma, MOF-76 was synthesized by hydrothermal method and then hydrothermally annealed at 140 °C for 4 h. As a result, the annealing not only significantly improves the crystallinity of MOFs but also promotes their transition from the original tetragonal phase to the monoclinic phase. The annealed MOFs ( a MOF) exhibit about 3-fold emission enhancement and show better stability, especially under alkaline conditions or in water or saturated alkanes, such as cyclohexane, and dichloromethane. The total emission intensity of the as-prepared (AP) MOF is reduced to less than 1/10 compared to the a MOF due to the influence of water molecules. When the material was immersed in a mixture of ammonia and water, the a MOF emission remained stable, while the AP MOF emission rapidly decreased to approximately 12 % with an increasing volume ratio. Additionally, a notably enhanced 5 D 0 → 7 F 1 transition of Eu 3+ ions in MOF-76 has been observed for the first time. It was found that after hydrothermal annealing, the photoluminescence quantum yield of the MOF increases from 10.86 % to 61.48 %, and its synthesis yield can reach 73.8 %. The properties described above remarkably enhance the application values of the a MOFs. Interestingly, MOFs can also be solvothermal annealed, thus the schemes presented in this context open up novel approaches to significantly improve/modify the performance of other MOF materials. Finally, the obtained green and red emitting a MOFs combined with the N-CDs@starch were applied to warm white LED with the colour coordinates (CIE) of (0.3662, 0.3544), colour rendering index (CRI) of 88.5 and correlated colour temperature (CCT) of 4261 K.
研究领域:
材料科学
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光学
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高影响因子
LUMINESCENCE
·
2026
·Vol. 41
·期 1
·e70421
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IF 3
Weijun Gui,Suhang Wu,Yanghui Liu,Lu Gan,Xianmin Zhang,Miroslav Almáši,Xiaohang Zhang
To date, most luminescence studies on MOF-76 have focused on tetragonal Tb 3+ -doped and Tb 3+ /Eu 3+ co-doped systems. In this work, MOF-76(Gd, Dy) and MOF-76(Gd, Tb, Dy, Eu) were synthesised for the first time and subsequently subjected to hydrothermal annealing in the presence of polyvinylpyrrolidone (PVP) as a dispersant. Annealing induced a tetragonal → monoclinic phase transition in MOF-76 and transformed the morphology from rods into highly crystalline, transparent nanosheets. As a result, the emission intensity of annealed MOF-76(Gd 0.98 , Dy 0.02 ) increased by approximately 25-fold and its photoluminescence quantum yield (PLQY) improved from 2.33% to 18.60%. These enhancements enabled the combination of hydrothermal annealing with a lanthanide co-doping strategy to achieve precisely tunable, highly luminescent colours in the multi-doped MOF-76(Gd, Tb, Dy, Eu) system. In the annealed materials ( a MOFs), efficient Tb 3+ → Dy 3+ and Dy 3+ → Eu 3+ energy transfer pathways were identified. Owing to their high luminescence and colour tunability, the resulting materials demonstrated practical applicability in colour-tunable fluorescent anti-counterfeiting and, when combined with N-CDs@starch, in white-light-emitting LED devices.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 16
·4227-4236
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IF 4.157
Chen Li,Liu Donghao,Zheng Limin,Yi Simin,He Hua
In the present work, a structure-dependent ratiometric fluorescence (RF) sensor constructed with boric acid–modified carbon quantum dots (B-CQDs) and Tb-MOF(MOF-76) was developed for sensing 2,6-pyridinedicarboxylic acid (DPA). Based on the distinct fluorescent responses of B-CQDs and MOF-76 to DPA, MOF-76/B-CQDs can be developed as a RF sensor for DPA detection. In this RF sensor, the reticulated cross-linked structure of MOF-76/B-CQDs can be destroyed by DPA due to a strong coordination effect between DPA and the Tb of MOF-76, resulting in the quenching of the fluorescence of B-CQD and the restoration of the fluorescence of MOF-76 after the addition of DPA. Benefiting from the confinement effect of the special structure change, the presented sensor showed high sensitivity toward DPA with a detection limit of 3.05 μM and excellent selectivity over the monochromatic fluorescence sensor. Graphical abstract
研究领域:
分析化学
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材料科学
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传感器
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Nuo Duan,Xiaowan Chen,Xianfeng Lin,Dichen Ying,Zhouping Wang,Wenbo Yuan,Shijia Wu
Herein, a paper-based fluorescence sensor based on the metal-organic frameworks capped with aptamer and molecular imprinted polymer ( [email protected] ) was designed for malachite green (MG) and realized sensitive detection by using digital image colorimetry with the aid of smartphone. The green fluorescence terbium MOF-76 was prepared and used as a carrier to conjugate with MG specific aptamer. MG, as template molecule, was subsequently added into MOF-Apt to generate MIP layer under the action of co-polymerization process. With the addition of MG, the fluorescence of [email protected] was quenched because MG was synergistically bound with aptamer and MIP and induced photo-induced electron transfer (PET) effect. Then, the obtained [email protected] probe was applied to a circle pattern paper and measured by a smartphone, in which color recognition software was installed to read out the RGB values of the acquired images. The detection limit for paper-based detection was 0.1 ng/mL. This point of care testing (POCT) method was applied to detect MG in fish and water samples with recoveries in 94.0–105.6 %. This method endows synergistic binding effect of aptamer and MIP, enhancing the detection sensitivity and specificity, and the paper-based detection with smartphone facilitate the on-site monitoring. It is expected that this sensor will be of great significance for the detection and monitoring of illegal additive in food stuffs.
研究领域:
分析化学
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环境科学
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食品安全
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材料科学
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高影响因子
危险品化学品经营许可证（带存储）