JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Chenxia Li,Bowen Chen,Degang Deng,Hua Yu,Hao Li,Changyu Shen,Le Wang,Shiqing Xu
The La 1-0.03- y Gd y AlO 3 : 0.03Eu ( y = 0.2–0.8) phosphors are prepared via solid phase method. The normal thermal quenching of Eu 2+ ion and abnormal thermal quenching of Eu 3+ ion in La 1-0.03- y Gd y AlO 3 : 0.03Eu ( y = 0.2–0.8) phosphors are explained by the configuration coordinate system and energy transfer process . Considering the fluorescence intensity ratio temperature measurement technology, the temperature sensitivity values of the phosphors increase with the increase of Gd 3+ ion concentration . When Gd 3+ ion concentration is 0.8, the maximal S a and S r can even reach 0.084 K -1 and 3.233% K −1 . Moreover, the excellent separation of emission peaks of Eu 2+ and Eu 3+ ions also provides good signal discriminability for temperature measurement. These results indicate that the La 1-0.03- y Gd y AlO 3 : 0.03Eu phosphors can be used as the superior non-contact optical thermometry materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Forests
·
2023
·Vol. 14
·期 6
·1094
·
IF 2.9
Renjie Li,Junyuan Li,Jiangtao Shi,Yongyue Zhang,Yuxin Sun,Yuxi Chen,Zhipeng Liu
The water immersion ofPterocarpuswood produces strong blue fluorescence, which comes from the extract. The fluorescence contained in the extract is of interest for the identification ofPterocarpuswood. We conducted an investigation into the extraction solution ofPterocarpuswood and analyzed the mechanism of fluorescence in this species. Possible species of the fluorescent molecules are discussed based on the mixture. Liquid chromatography mass spectrometry (LC-MS) is used for an analysis of the extract, the obtained substances that may be fluorescent inPterocarpuswood. In addition, the change in the fluorescence intensity with changes in the pH and concentration in the extract is also studied. The results show that the fluorescent molecule is quenched by aggregation (Aggregation-Caused Quenching; ACQ) and is unstable in over-acidic and over-alkaline conditions (especially acidic).Keywords:Pterocarpuswood;extract solution;fluorescence intensity;conjugate structure
研究领域:
植物学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
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
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2014
·
IF 3.259
Zhongqiu Hu,Lin Li,Yahong Yuan,Tianli Yue
Ultrasensitive and simultaneous determination of amino acids and amines (AAs) in media and winemaking products is very important for evaluating the relationship profile between the depletion of AAs and aroma compounds formation. In this work, by combing the advantages of Taguchi’s scheme with Pareto graphs and Range analysis pattern, an analytical method with efficiently improving fluorescence intensity and resolutions of AAs while saving the time and resources is developed to simultaneously and ultrasensitively detect 21 AAs in media, wine and beer. The results indicate the detection limit (DL) could be reached at ng L −1 level (3.34–284.3 ng L −1 ), which is 10 6 higher than that of DL obtained by general method. Furthermore, the linear ranges are also established so that the proposed method could be accurately applied. These results demonstrate the method provides an easy and effective way to ultrasensitively and simultaneously analyse AAs in complex products.
研究领域:
分析化学
·
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zelong Zhang,Linli Shen,Yi Zhao,Yujie Zhang,Haisheng Yang,Weidong Xiang,Xiaojuan Liang,Guoxin Chen,Haitao Yu
Many previous studies have reported that because of the large difference between the ionic radii of Cl and I, halogen exchange is difficult to occur between CsPbCl 3 and CsPbI 3 perovskite nanocrystals, and the interaction between CsPbCl 3 and CsPbI 3 NCs will lead to their dissolution. In this work, two kinds of nanocrystals, CsPbCl 3 and CsPbI 3 , were successfully crystallized simultaneously in glass by an in-situ growth method for the first time. Because of the effective reabsorption of photons, the CsPbCl 3 :CsPbI 3 nanocrystals displayed higher fluorescence emission intensity and higher photoluminescence quantum yield than those of CsPbI 3 nanocrystals. In addition, CsPbCl 3 :CsPbI 3 nanocrystal glasses showed excellent water resistance and thermal stability, which benefited from the effective protection of the glass matrix. In particular, the fluorescence intensity of the nanocomposites remained above 95% after immersion in water for 60 days. Light-emitting devices were prepared by combining a near-infrared-emitting CsPbCl 3 :CsPbI 3 nanocrystal glass and 400 nm LED chip, which were applied to indoor plant growth.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2015
·Vol. 26
·期 49
·495102
·
IF 3.821
Ming-Hao Yao,Jie Yang,Ji-Tao Song,Lin Zhang,Bi-Yun Fang,Dong-Hui Zhao,Rui-Xue Xia,Rui-Mei Jin,Yuan-Di Zhao,Bo Liu
Quantum dot (QD)–polypeptide probes have been developed through the specific metal-affinity interaction between polypeptides appended with N-terminal polyhistidine sequences and CdSe/ZnS core–shell QDs. The size and charge of a QD–polypeptide can be tuned by using different coiled-coil polypeptides. Compared to glutathione-capped QDs (QD–GSH), QD–polypeptide probes showed an approximately two- to three-fold luminescence increase, and the luminescence increase was not obviously related to the charge of the polypeptide. QD–polypeptide probes with different charge have a great effect on nonspecific cellular uptake. QD–polypeptide probes with negative charge exhibited lower nonspecific cellular uptake in comparison to the QD–GSH, while positively charged QD–polypeptide probes presented higher cellular uptake than the QD–GSH. A targeted QD–ARGD probe can obviously increase targeted cellular uptake in αvβ3 overexpressing HeLa cells compared to QD–A. In addition, QD–polypeptide probes showed lower in vitro cytotoxicity compared to the original QDs. These results demonstrate that these QD–polypeptide probes with high specific cellular uptake, high fluorescence intensity and low background noise are expected to have great potential applications in targeted cell imaging.
研究领域:
生物化学
·
分子生物学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuang-Yin Zhu,Dan Zhao,Rui-Juan Zhang,Qing-Xia Yao,Wen Liu
Researches on fluorescence intensity ratio (FIR) based temperature sensors have become more and more popular in recent years. Herein, we co-doped Pb 2+ and Sm 3+ into the host material Ba 2 MgY 2 (BO 3 ) 4 (BMYB) to prepare a new series of phosphors. The Pb 2+ activated phosphor BMYB:0.03 Pb 2+ presents a wide blue emission band centered at 416 nm under 278 nm laser excitation with internal quantum efficiency of 46%. In the presence of both Pb 2+ and Sm 3+ , energy transfer will occur between them, resulting in tunable color emission. Besides, the phosphor has an absolute sensitivity of 0.96% K −1 at 575 K, which makes it an excellent candidate for temperature sensing. These findings suggest that prepared phosphor is a potential candidate for color tunable phosphor and temperature sensing material.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Mingguang Zhu,Youzhen Zhuo,Hongyu Guo,Fafu Yang,Jiabin Qiu
The first perylene liquid crystals bearing six peripheral alkyl substituents on both 1,6,7,12-bay positions and imides positions were designed and synthesized in yields of 72–77%. The studies on their mesomorphic behaviors suggested that they possessed good ordered hexagonal columnar mesophase with low phase transition temperatures and wide ranges of mesophase temperature in comparison with their precursors with chloric groups and the similar perylene liquid crystal with 4- tert -butylphenolic groups on bay positions. Their photophysical properties revealed that they also had higher fluorescence intensities and fluorescence quantum yields than that of their precursors with chloric groups and the similar perylene liquid crystal with 4- tert -butylphenolic groups on bay positions. The good fluorescence in both solution and solid film were observed for the first time for perylene liquid crystals. This research indicated that the introduction of long p -nonylphenol units on bay position is an effect strategy to obtain perylene liquid crystal with good liquid crystalline behavior and excellent fluorescent property.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Deyuan Yang,Ruirui Cui,Chaoyong Deng
Optical thermometry has attracted great attention because it enables accurate temperature measurement in harsh environments due to non-contact temperature measurement. Three-dimensional (3D) lead-free halide perovskites have a great application potential in this field, due to its outstanding luminous properties and stability. In this work, the Sb 3+ and Er 3+ are introduced in Cs 2 NaYCl 6 double perovskites (DPs). The Sb 3+ doping Cs 2 NaYCl 6 DPs exhibits bright blue emission from the Sb 3+ activated self-trapped excitons (STEs) and Sb 3+ ,Er 3+ co-doped Cs 2 NaYCl 6 has efficient green emission with excellent photoluminescence quantum yields (PLQY) of 81.1% because of the presence of energy transfer from self-trapped excitons to Er 3+ ions. Excitingly, the ratio between the fluorescence intensity at 524 nm and 550 nm (FIR( I 524 nm / I 550 nm )) and the ratio between the fluorescence intensity at 524 and 456 nm (FIR( I 524 nm / I 456 nm )) both have a high correlation with temperature in the range of 298–473 K. The maximum of relative sensitivity values reach to 1.18%/K ( I 524 nm / I 550 nm ) and 1.19%/K ( I 524 nm / I 456 nm ) at 298 K, respectively. The outstanding temperature sensitivity suggests that the Sb 3+ ,Er 3+ co-doped Cs 2 NaYCl 6 has enormous application potential in ratiometric optical thermometry.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Jintao Xu,Shanlin Zhu,Canyuan Liao,Weijun Zhao,Xingyuan Zhong,Zijun Wang,Jiuping Zhong
High-sensitivity optical temperature measurement has attracted extensive attention in both fundamental studies and practical applications. In this study, a series of upconversion (UC) luminescence phosphors composed of NaGd(PO 3 ) 4 (NGP) doped with 20 at% Yb 3+ and various concentrations of Er 3+ (0.5 at% as the optimal concentration) was synthesized by high-temperature solid-state method. And their crystal structure and the distribution of lanthanide dopants were analyzed using X-ray diffraction with Rietveld refinement verifies. Under 980 nm laser excitation, the obtained phosphors show the characteristic Er 3+ upconversion green and red emission bands through two-photon processes. The fluorescence intensity ratio (FIR) based on the thermal coupled states demonstrates the thermal sensing ability in a wide temperature range of 200–573 K. The thermal sensitivity is relatively high with the maximum absolute thermal sensitivity S a of 0.53 % K −1 (523 K) and the maximum relative thermal sensitivity S r of 2.60 % K −1 . The phosphor NGP:Yb/Er also exhibits high repeatability as the thermal sensors reach 97 %. These findings postulate the potential of NGP:Yb/Er as a promising candidate in optical thermal sensing applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Jian Zhu,Si-Nan Wang,Jian-Jun Li,Jun-Wu Zhao
In this work, the effect of core size on the fluorescence emission properties of CdTe@CdS core@shell quantum dots was investigated under the condition of different shell thickness and pH values. Both CdTe and CdTe@CdS core@shell QDs were synthesized in aqueous phase by a simple method, whose optical features were characterized by absorption and fluorescence spectra . High resolution transmission electron microscopy (HRTEM) and X-Ray Diffraction (XRD) were utilized to study the structure and composition of the as-prepared QDs. We can conclude that a smaller initial core exhibits a greater potential for optimizing both fluorescence intensity enhancement and red shift. What's more, there is an optimal shell thickness for the strongest fluorescence intensity while a thicker shell contributes to a larger fluorescence red shift. The optimal pH value is 10.5 for the fluorescence intensity enhancement of the core@shell QDs and a higher pH value is an advantage to expedite the growth rate of CdS shell.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Corrosion Communications
·
2023
·
IF 0
Xiaoping Lai,Jie Wang,Xin Wang,Kuo Jiang,Weizhi Tian,Baowen Xu
YSZ:Eu powder was prepared by sol spray pyrolysis method. Thermal barrier coatings (TBCs) composed of Eu 3+ -doped pure tetragonal yttrium-stabilized zirconia (namely, YSZ:Eu) were fabricated by air-plasma spraying technique. Crystal structure and fluorescence intensity of YSZ:Eu coating were investigated after aging at 1200 °C for 5 − 100 h. X-ray diffraction (XRD) indicates that tetragonal phase in YSZ:Eu coating had high resistance to degradation over a wide range of time periods and temperatures. Luminescence results indicate that asymmetry ratios of the fluorescence emission spectra were stable in a range of 1.2 ± 0.2. Relationships between phase structure and lattice distortion were further studied by fluorescence spectroscopy measurement using I 606 / I 590 intensity ratio. The fluorescence results were consistent with those drawn by XRD, where the high stability of YSZ:Eu coating was confirmed. Excellent thermal stability, in terms of both the phase structure and luminescence intensity, of YSZ:Eu coating indicates that the present preparation method is suitable for phosphor powder applications.
研究领域:
材料科学
·
无机化学
·
光学
✓ 已验证
DOI
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