JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 17
·16384-16394
·
IF 2.195
Dong Chao,Zhang Yanjie,Duan Jianjun,Yu Jingjie
A series of Eu 2+ and Eu 3+ coexisting Ca 2 P 2 O 7 phosphors with tunable red/blue (R/B) emission have been successfully synthesized by a two-step method. Phase composition, luminescence properties and surface states are investigated by the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), photoluminescence (PL) emission spectra, fluorescence quantum efficiency, fluorescent lifetime and X-ray photoelectron spectroscopy (XPS). It can be concluded from XRD and FTIR results that pure Ca 2 P 2 O 7 phase can be obtained at 900 °C and Ca 3 (PO 4 ) 2 impurity phase occurs at an increasing preparation temperature (1100 °C). The XRD results confirm that the Eu 2+ or Eu 3+ doped samples all exhibit pure tetragonal Ca 2 P 2 O 7 crystal with space group P 4 1 . Under excitation of 330 nm, Eu 2+ singly-doped Ca 2 P 2 O 7 phosphors showed a broad blue emission band at 422 nm, while the Eu 3+ single-doped samples emitted a strong orange-red light with wavelength of 591, 597 and 618 nm excited by 395 nm. In particular, oxygen vacancies in pure Ca 2 P 2 O 7 crystal are found due to the strong PL emission at 420 nm. Furthermore, Eu 2+ /Eu 3+ co-doped Ca 2 P 2 O 7 phosphors prepared by this two-step synthesis show the blue emission at 422 nm (Eu 2+ ions) and the orange-red emission (Eu 2+ ions) at 591 nm, 597 nm and 618 nm under near-ultraviolet (NUV) excitation of 380 nm. It was detected that the quantum efficiency of the Ca 1.88 P 2 O 7 :0.12Eu phosphor was 37.7%. The tunable R/B emission ratio from 0.13 to 1.56 can be achieved by controlling the recalcined temperature in the second step when excited by 380 nm. The XPS demonstrate the existence of Eu 3+ ions on the surface of Eu 2+ /Eu 3+ co-doped Ca 2 P 2 O 7 phosphors. Under NUV excitation in the range from 350 to 400 nm, the optimum Commission International de I’Eclairage (CIE) coordinate of Ca 2 P 2 O 7 :0.12Eu 2+ /Eu 3+ phosphors is (0.3648, 0.215), which can be potentially used as an emitting source to meet the needs of illumination devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 44
·24308-24315
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IF 3.567
Leipeng Li,Xudong Qi,Feng Qin,Lu Li,Hong Gao,Yangdong Zheng,Zhiguo Zhang
A guideline for designing sensitive thermometry is proposed. It reveals that using two emission bands that possess the opposite change tendencies against temperature makes it easier to achieve a larger relative sensitivity. Based on the guidelines, a highly sensitive strategy for optical thermal detection that depends on the Tb3+-to-Eu3+ emission ratio is designed by exciting Eu3+/Tb3+'s unusual absorption lines. This can be easily driven by a commonly used and cheap 405 nm laser diode. Moreover, its maximum relative sensitivity reaches up to 2.02% K−1 at 610 K, one of the largest sensitivities reported so far.
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 ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tang Qiyue,Xia Hongbo,Wu Zikang,Liu Rongjie,Qi Wenlin,He Wentao,Yang Yuqin
Cesium lead halide perovskite nanocrystals (CsPbX 3 NCs) doped with Mn 2+ brings attractive long-wavelength emission and flexible color tunability. However, modulating the exciton-to-Mn 2+ energy transfer efficiency poses a challenge, particularly when relying on traditional methods such as changing halogen composition or incorporating external cations, which often complicate the process. In this work, a simple photonic bandgap (PBG)-modulation strategy is applied to modulate the exciton-to-Mn 2+ energy transfer by constructing a sandwich “PC-Perovskite-PC” structure with two photonic crystal (PC) films and Mn 2+ doped CsPb(ClBr) 3 NPs. When the PBG and the host emission band change from deviation to coincidence, the lifetime of Mn 2+ decreases from 0.54 ms to 0.36 ms owing to the enhancing energy transfer efficiency by PBG effect. Meanwhile, the ratios of orange and blue emissions (O/B) increase from 1.36 to 1.6. In addition, the back energy transfer also can be modulated. When the PBG matches well with the Mn 2+ emission band, the lifetime of the host emission exhibits the largest value (1.25 ns) owing to back energy transfer from Mn 2+ the host. Meanwhile, the O/B value shows the smallest value (0.52) attributed to the decreased spontaneous radiation of Mn 2+ and the enhanced host emission. When PBG deviates from the Mn 2+ emission band, the lifetime of the host emission decreases but O/B value increases gradually. This work provides new strategy for the modulation of energy transfer in Mn 2+ doped CsPb(ClBr) 3 NPs.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Dongsheng Zhao,Wenqian Li,Rongmei Wen,Nana Lei,Wencui Li,Xin Liu,Xiutang Zhang,Liming Fan
With the introduction of Eu3+ ions as the secondary fluorescent signal reporter and sensing active sites, a dual-emission ratiometric sensor of Eu3+@NiMOF (Eu3+ functional NiMOF) for hippuric acid (HA) detection in urine and serum was fabricated via the postsynthetic encapsulating strategy. Based on the two emission signals at 441 nm (turn-on) and 628 nm (turn-off), the produced Eu3+@NiMOF ratiometric sensor provided enhanced sensitivity, higher selectivity, and 9.7 times lower limits of detection (LOD) for the detection of HA (2.38 μM, 0.42 μg·mL–1) than that of the pristine NiMOF. Considering the high sensitivity and visualization results, further exploration of intelligent applications in the HA sensing process was carried out by constructing a tandem combinational logic gate to improve the practicability and convenience with the help of a smartphone. This work provides a promising approach for developing MOF-based ratiometric sensors to detect biomarkers.
研究领域:
生物传感
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Wenqian Li,Dongsheng Zhao,Wencui Li,Rongmei Wen,Xin Liu,Liying Liu,Ting Li,Liming Fan
By taking advantages of confinement effect can effectively prevent dye aggregation caused luminescent quenching, Eosin Y (EY) was encapsulated into a chemorobust porous CoMOF as secondary fluorescent signal to construct the dual-emitting sensor of EY@CoMOF. And the photo-induced electron transfer from CoMOF to EY molecules induced EY@CoMOF presenting a weak blue emission at 421 nm and a strong yellow emission at 565 nm. Those dual-emission features also endow EY@CoMOF itself great potentials as a self-calibrating ratiometric sensor in visually and efficiently monitoring hippuric acid (HA) in urine, with fast response, high sensitivity and selectivity, excellent recyclable, and low LOD (0.24 μg/mL). Furthermore, based on a tandem combinational logic gate, an intelligent detection system was designed to improve the practicability and convenience of HA detection in urine. To the best of our knowledge, this is the first example of dye@MOF based sensor for HA detection. And this work provides a promising approach for developing dye@MOF based sensors to intelligent detect bioactive molecules.
研究领域:
化学传感器
·
生物医学检测
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wenting Li,Xinai Zhang,Xuetao Hu,Yongqiang Shi,Zhihua Li,Xiaowei Huang,Wen Zhang,Di Zhang,Xiaobo Zou,Jiyong Shi
A novel fluorescence sensing platform was fabricated for visual detection of cadmium ions (Cd 2+ ) with excellent stability and portability. In this protocol, dual-emission ratiometric fluorescence probe were constructed based on silicon oxide-coated copper nanoclusters (CuNCs@SiO 2 ) as a signal reference and cadmium telluride quantum dots (CdTe QDs) as signal response, thereby greatly improving the accuracy of test results. The level of Cd 2+ can be reported within a wide linear range from 0.010 mg·L −1 to 2.0 mg·L −1 with a sensitive detection limit of 1.1 μg·L −1 (2.75 μg·kg −1 ) and a quick sample-to-answer monitoring time of 6 min, which was quite qualified for regularly monitoring Cd 2+ . Moreover, aiming to attain portable analysis, the smartphone as colorimetric reader and analyzer were also utilized for rapidly analyzing Cd 2+ by capturing the change in fluorescence color. Additionally, benefiting from the strong combination of 1, 10-phenanthroline (Phen) and Cd 2+ , the fluorescence probe showed excellent anti-interference activities for Cd 2+ assay in complex oyster matrix. Overall, the sensing platform had significant stability, specificity and sensitivity, offering a promising potential for conveniently evaluating the quality of marine bivalves polluted with Cd 2+ .
研究领域:
分析化学
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环境科学
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生物技术
✓ 已验证
DOI
高影响因子
Materials Advances
·
2021
·Vol. 2
·期 10
·3346-3352
·
IF 0
Ying Li,Dan Liu,Ya-Qi Wang,Fang-Fang Wang,Han-Xun Qiu
In this study, we developed a novel flexible method to construct a lanthanide dual-emitting ratiometric fluorescence nanoprobe with excellent luminescence properties and significant selectivity for the detection of copper ions, where the central Eu3+ ions are coordinated with 2,6-pyridinedicarboxylic acid (DPA) on the surface of CQDs. The structure and chemical sensing photoluminescence properties of the as-prepared fluorescent probe have been investigated in detail. Moreover, the results have shown that Eu-DPA–CQDs exhibit two fluorescence emissions at 450 nm and 613 nm, respectively, under an excitation wavelength of 285 nm. The responses of the two emissions towards Cu2+ ions are completely different and can provide references for each other. Therefore, it can be designed as a fluorescence sensor for the detection of Cu2+ ions. The emission spectrum at 613 nm is markedly quenched, while that at 450 nm slightly changed after the addition of Cu2+ ions. When the Cu2+ ion concentration was 0–150 μM, the FL ratio (IEu/ICQDs) showed a good linear relationship with the lowest detection limit (LOD) of 6 nM. Thus, the reported sensor has a high selectivity, satisfactory accuracy and precision, and it may provide the potential application in the biological and environmental fields.
研究领域:
材料科学
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分析化学
·
环境科学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17323-17330
·
IF 3.201
Xiangning Bu,Yongxin Fu,Hui Jin,Rijun Gui
This work demonstrates a novel, facile and efficient biosensor for dual-emission ratiometric and visual fluorescence detection of choline. Copper nanoclusters (CuNCs) were prepared by using N2H4·H2O as the reducing agent and lysozyme as the stabilizer, based on an ambient hydrothermal method. The prepared CuNCs were blue-emitting and showed an emission peak centered at 440 nm. In the mixture system consisting of CuNCs, choline oxidase, horseradish peroxidase (HRP) and o-phenylenediamine (OPD), the added choline was catalyzed by choline oxidase to generate H2O2. OPD was oxidized by H2O2 and HRP to generate 2,3-diaminophenazine (DAP). As the oxidation product of OPD, DAP emitted a fluorescence peaked at 550 nm and the fluorescence exhibited a regular enhancement with the increase of the choline concentration. Meanwhile, the fluorescence of the CuNCs was reduced by DAP due to an internal filtration effect-induced fluorescence quenching. There is an optimal linear relationship (r = 0.9992) between the ratiometric fluorescence intensity (IDAP/ICuNCs, I550/I440) and the choline concentration in the range of 0.1–80 μM, with a low limit of detection of 25 nM. The response of IDAP/ICuNCs to choline was sensitive and selective over potential interferents existing in real samples. This developed sensor enabled the naked-eye visual detection of choline in aqueous solutions and on immersed filter papers. In human serum and liquid milk samples, this sensor showed a superior performance for choline detection.
研究领域:
生物传感器
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分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yue Yang,Qunyan Wei,Tong Zou,Yulin Kong,Linfeng Su,Dian Ma,Yude Wang
Developing dinotefuran (DNF) sensing probe is crucial for the monitoring of DNF residues. A dual-emission ratiometric fluorescent probe of sulfur-doped carbon quantum dots (S-CQDs) and copper nanoclusters (CuNCs) hybrid (S-CQDs/CuNCs) were developed for sensitive and selective detection of DNF. The fluorescent signals of CuNCs were quenched in the presence of DNF, while the fluorescent signals of S-CQDs enhanced after the addition of DNF. The ratiometric fluorescent performance of as-developed probe was mainly based on the inner filter effect (IFE) between S-CQDs and CuNCs. Interestingly, the aggregation of CuNCs occurred after the addition of DNF, reducing the IFE effect between S-CQDs and CuNCs, leading to the fluorescent intensity of S-CQDs recovered and CuNCs fluorescence decayed. The ratiometric fluorescent performance of S-CQDs/CuNCs illustrated a good sensitivity and selectivity ranging from 10 μM and 500 μM, with a low detection limit of 7.04 μM. Importantly, real samples investigations implied the good application potential of S-CQDs/CuNCs in DNF monitoring.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 79
·75664-75668
·
IF 3.289
Zhenmin Xiong,Yushi Yang,Youfa Wang
LiGdF4 nanoparticles (NPs) with different Ca2+ contents were synthesized by a thermal decomposition method. The as-prepared NPs were able to emit green and strong red light when excited by a 980 nm laser through a two-photon process and they were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and photoluminescence (PL) spectroscopy. Rietveld refinement was performed to explore the structure and phase composition of the product. It was found that Ca2+ ions were vital to the successful synthesis of LiGdF4 NPs and an appropriate Ca2+ content (ca. 19%) yielded the product with highest purity. The purity of the obtained product was highly correlated with the PL intensity and red/green light intensity ratio.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Jiaqi Zhao,Zheng Fu,Kejie Li,Mengmeng Dai,Zhiying Wang,Guiying Liang,Yanling Wei,Zuoling Fu
The growing demand for efficient and sustainable photonic materials has spurred significant interest in eco-friendly lead-free double perovskites, which exhibit exceptional photoluminescence properties for next-generation sensing and display technologies. However, the emission performance of the material is limited by multiphonon relaxation, which leads to low energy efficiency under complex operating conditions. In this study, the 3H5 energy level of Tm3+ is strategically engineered as an energy bridge within lead-free double perovskites, effectively overcoming the constraints imposed by inefficient multiphonon relaxation in Er3+ (4I11/2 → 4I13/2). This targeted modulation of energy transfer pathways results in a significant 50-fold enhancement in the red-to-green (R/G) emission ratio of Er3+, increasing from 0.09 to 4.58, accompanied by a pronounced chromaticity shift from green (0.278, 0.709) to red (0.678, 0.320). This tunable emission behavior is further modulated by laser power density and excitation wavelength (808 or 980 nm). Moreover, Gd2MgTiO6 (GMTO):Er3+,Tm3+ demonstrates excellent temperature-measuring ability based on the luminescence intensity ratio (2H11/2/4F9/2 → 4I15/2), achieving a maximum relative sensitivity of 1.03% K−1 at 313 K. This work not only demonstrates a generalizable strategy to suppress multiphonon relaxation via lanthanide energy bridges but also paves the way for multifunctional photonic devices tailored to emerging applications in smart sensing, secure communication, and next-generation optoelectronics.
研究领域:
材料科学
·
光子学
·
稀土发光
·
固态物理
·
传感器技术
·
纳米光学
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Ying Li,Ya-Qi Wang,Dan Liu,Yu Gao,Sai-Nan Wang,Hanxun Qiu
Herein, we develop a novel method to synthesize lanthanide-functionalized carbon quantum dots via free-radical copolymerization using the methyl methacrylate (MMA) monomer as a functional monomer and introducing a lanthanide complex to obtain the dual-emission fluorescent composite material FCQDs-Ln(TFA)3 (Ln = Eu, Tb; TFA: trifluoroacetylacetone). The obtained composites were fully characterized, and their structures were investigated by Fourier transform infrared spectroscopy (FTIR), 1H NMR spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Subsequently, a series of white-light-emitting polymer composite films FCQDs- (Eu:Tb)(TFA)3/poly(methyl methacrylate) (PMMA) were designed and synthesized by adjusting the ratio of Eu(TFA)3/Tb(TFA)3 under different wavelengths. More significantly, FCQDs-Tb(TFA)3 was selected as a sensitive probe for sensing metal cations due to excellent photoluminescence properties, revealing a unique capability of FCQDs-Tb(TFA)3 of detecting Fe(III) cations with high efficiency and selectivity. Furthermore, the sensing experiment results indicated that FCQDs-Tb(TFA)3 is ideal as a fluorescent nanoprobe for Fe3+ ion detection, and the lowest detection limit for Fe3+ is 0.158 μM, which is superior to many other previous related research studies. This pioneering work provides a new idea and method for constructing a dual-emission ratio sensor based on carbon quantum dots and also extends the potential application in the biological and environmental fields.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
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