JOURNAL OF LUMINESCENCE
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2014
·
IF 2.367
Jiansheng Huo,Jiadan Zhu,Shunhua Wu,Haijie Zhang,Qianming Wang
Red emissive phosphors of YTa 1− x Nb x O 4 :Eu 3+ ( x =0–1) have been successfully synthesized by a molten salt method. Powder characteristics were studied by X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. The effects of Nb concentration ( x ), flux nature and firing temperature on photoluminescence behavior of YTa 1− x Nb x O 4 :Eu 3+ were extensively investigated. The results showed that the photoluminescence spectra of the samples exhibited strong red emissions (615 nm) upon the ultraviolet excitation and the emission intensities strongly dependent on the host-lattice composition and particle morphology .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qian Jiang,Jie Chen,Beitong Liu,Yuping Zhang,Yuan Qiu,Hong Wang,Yonggui Liao,Xiaolin Xie
Luminescent metal–organic gels (LMOGs) have gained much attention due to their crucial role in visual recognition and information encryption. However, it is still a challenge to simplify the design of ligands and enrich the stimuli responses in LMOGs simultaneously. Herein, although a single pyridine ligand cannot form gel alone, after coordination with metal ions, two kinds of LMOGs have been obtained with pyridine–metal complexes, where metal ions can act as cogelators and regulate luminescence of the pyridine-functionalized cyanostilbene ligand at the same time. The effects of metal types on the fluorescence emission color, the fluorescence quantum yield, the fibril network, and the assembly mode of the gel have been investigated systematically. In addition, two competitive ligands were used to regulate the fluorescence and phase transition of the gel. Finally, the logic gates and the information encryption and decryption have been successfully constructed. This kind of material is expected to be applied to fluorescence display, advanced information encryption, high-tech anticounterfeit, and so forth.
研究领域:
材料化学
·
光学材料
·
超分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 3
·1085-1096
·
IF 7.059
Jindi Wang,Shuai Huang,Mengmeng Shang,Peipei Dang,Hongzhou Lian,Jun Lin
In this work, using β-Ca3(PO4)2 as a structural model, a series of [Ca9Na3xY1−x(PO4)7 (CNYPO-I, 0 ≤ x ≤ 1/2) ← Ca3(PO4)2 → Ca9+yNa3/2−y/2Y(1−y)/2(PO4)7 (CNYPO-II, 0 ≤ y ≤ 1)] phosphors were prepared using a cationic heterovalent substitution approach. The substitution of Y3+ and Na+ for Ca2+ led to a redistribution of Eu2+ within the lattice and was accompanied by changes to the corresponding luminescence behavior. As the x and y values increased, the vacancies in the structure were gradually occupied by Na+ to form Na(4) sites that are conducive to Eu2+ occupation. When y = 1, the vacancies were completely occupied, and the Eu2+ emission peaks from Ca(1/2) and Ca(3) sites showed a significant blue shift. The underlying mechanism of that shift is discussed. The CNYPO-I (x = 0) sample displayed the best thermal stability; the effects of vacancies, thermal ionization and cross-over mechanism on thermal quenching are also discussed. As x and y increase, the thermal stability of the samples gradually decreased. Eu2+ and Mn2+ co-doped CNYPO-I (0 ≤ x ≤ 1/2) and CNYPO-II (0 ≤ y ≤ 1) phosphors achieved full coverage of the visible light region (400–800 nm). These white LEDs have relatively high color-rendering indexes (>80) and adjustable color temperatures from 2854–7000 K. This work provides an effective strategy for designing novel luminescent materials and realizing multi-site adjustment of activator ions.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 7
·3592-3598
·
IF 2.936
Pingping Feng,Xinying Wang,Yushuang Zhao,De-Cai Fang,Xiaojing Yang
Energy transfer between rare earths in layered rare-earth hydroxides (LRHs) is worth the intensive study because the hydroxyls that act as the bridge connecting the neighbouring rare earths would generate non-radiative transitions. This study focuses on the energy transfer in the intralayer and the adjacent layers of LRHs. A series of LEuxTb1−xHs (x = 0, 0.05, 0.2, 0.5, 0.8, and 0.95) was synthesized, the basal spacing (dbasal) was adjusted from 8.3 to 46 Å through ion-exchange process, and unilamellar nanosheets were prepared through a delamination process. The luminescence behaviours of the samples demonstrated the following: (1) for the delaminated nanosheets, the quenching effect of both Eu3+ and Tb3+ was hardly observed. This implies that in the intralayer, the efficiency of energy transfer is extremely low, so that highly-concentrated co-doping does not influence the luminescence and by controlling the Eu/Tb molar ratio, white light can be obtained. (2) For small dbasal, e.g., 27 Å, the fluorescence quenching of Tb3+ and Eu3+ was remarkable, while for large dbasal, e.g., 46 Å, the emission of Tb3+ emerged and the self-quenching between Eu3+ ions weakened. (3) The energy transfer efficiency deceased with an increase in the distance between adjacent layers. In other words, either the energy transfer between Eu3+ and Tb3+ or the energy migration between Eu3+ ions was more efficient when they were located in adjacent layers than in intralayers even when they were the nearest neighbours.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Wenjin Yang,Jing Li,Xinglai Zhang,Cai Zhang,Xin Jiang,Baodan Liu
The peculiar physical and chemical properties of 2D nanostructures have aroused global research interest in developing new members, synthetic technology, and exploring their potential applications in functional nanodevices. However, it is extremely challenging to directly obtain the 2D nanosheets for these extrinsic layered structures using conventional routines. In this work, we demonstrate the facile and general synthesis of 2D spinel-type metal oxides nanosheets through a simple hydrothermal reaction. Using this method, cubic γ-Ga2O3, ZnGa2O4 and MnGa2O4 nanosheets with triangular/hexagonal configuration and ultrathin thickness have been synthesized, and all these nanosheets show preferential growth along (111) plane with the minimum formation energy. Microstructural and composition analyses using HRTEM, EDS, XPS, and so on reveal that the as-synthesized 2D nanosheets are well-crystallized in cubic fcc-phase and show high purity in composition, and the formation process of MGa2O4 nanosheets can be regarded as the competition of M2+ and Ga3+ in tetrahedral site. Spatially resolved cathodoluminescence measurement of individual 2D nanosheet shows that the γ-Ga2O3, ZnGa2O4, and MnGa2O4 nanosheets exhibit distinct luminescence behavior, and ZnGa2O4 nanosheets show the strongest emission in visible region. It is expected that the facile synthesis of spinel-type metal oxides of γ-Ga2O3, ZnGa2O4, and MnGa2O4 nanosheets will further promote the exploration of a variety of semiconductor nanostructures that could not be achieved using conventional technology suitable for layered structures and will also open up some opportunities for the integration of advanced functional nanodevices such as photodetectors, phosphors on the basis of them.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Xiao-Feng Li,Jingyu Wang,Yu-Ting Wu,Yadong Zhou,Qiang-Qiang Zhu,Peiqing Cai,An Wang,Yan Shi,Le Wang,Shangzhong Jin,Fan-Li Zhang,Jian-Feng Li
Rare earth ion luminescent materials have attracted extensive attention due to their wide applications in biochemical sensing and bioimaging. However, the low quantum yield and weak luminescence intensity have restricted their further development. Realizing the modulation of rare-earth ions’ emission behavior has become a hot topic in the interdisciplinary fields of materials and chemometrics. Herein, the regulation of the electron decay process and emission of photon signals of rare earth ion (Eu3+) has been achieved in a well-defined plasmonic nanocavity. This nanocavity consists of Ag shell-isolated nanoparticles (SHINs) and an ultraflat Au film, which are separated by a polymer dielectric spacer and CaF2:Eu3+ nanoparticles. Contrary to the intrinsic photoluminescence of CaF2:Eu3+, a factor of 408 increase in the spontaneous emission rate and simultaneously an 800-fold enhancement in the emission intensity have been realized in nanocavities via comprehensive spectroscopic analysis. Additionally, the evolution law between the plasmon resonances and the luminescent enhancement as well as the emission spectrum of Eu3+ indicates a highly effective modulation of emission behavior by plasmons. This presents a novel strategy for enhancing the performance of optical micro- and nanodevices based on rare-earth ion materials, demonstrating significant potential in applications such as bioimaging and surface detection analysis.
研究领域:
材料科学
·
光谱学
·
化学计量学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Qi Zhou,Xuelin Dong,Jianhui Yuan,Binbin Zhang,Shan Lu,Yuxiang Xiong,Yonggui Liao,Qin Wang,Yajiang Yang,Hong Wang
Luminescent supramolecular metallogels based on the coordinating interaction of lanthanide ions and Fmoc-L-phenylalanine were prepared at room temperature within several seconds. The prepared metallogels exhibited strong characteristic luminescent behavior of lanthanide ions. The formation mechanism of metallogels was investigated by scanning electron microscopy, 1 H NMR, FT-IR as well as UV–Vis spectroscopy. The results indicated that the formation mechanism involved the synergistic effect between lanthanide metal-ligand coordination, π-π stacking and hydrogen bonding . The prepared metallogels showed excellent thermally stable luminescence, which may be attributed to their thermally stable structure. Additionally, the reversible “on-off” luminescence effect could be achieved by alternately titrating NaOH and HCl into the metallogels. Therefore, the metallogels could be potentially used as sensors and luminescent materials.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 28
·22289-22293
·
IF 3.84
Qiyi Lu,Juanjuan Zhang,Yuanya Wu,Ruo Yuan,Shihong Chen
The cathodic electrochemiluminescence (ECL) behavior of the ammonolysis product of 3,4,9,10-perylenetetracarboxylic dianhydride (PTC–NH2) in aqueous solution with K2S2O8 as the co-reactant has been, for the first time reported, in this paper. The possible mechanisms have been investigated. Based on the fact that dopamine (DA) can efficiently quench the ECL intensity of PTC–NH2, DA was chosen as a template to investigate the application of PTC–NH2–S2O82− system in the sensor field. Under the optimal conditions, we achieved the detection of DA with the detection limit of 1.6 × 10−9 M. Due to the excellent ECL behavior, PTC–NH2 could be a new class of promising material for the construction of ECL sensors.
研究领域:
分析化学
·
生物传感
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xingchen Liu,Jingyan Yu,Yonggen Tan,Wengao Zhang,Lingquan Zhu,Shenglin Ye,Jun Feng
Nitrogen doping is a widely used method for enhancing the performance of carbon quantum dots (CQD). However, the precise relationship between nitrogen content and emission spectra remains unclear when preparing high-performance nitrogen-doped CQD ( N -CQD). This study systematically investigates the effects of nitrogen content on the crystalline structure, optical properties, and electronic band structure of N -CQD. Citric acid was used as the carbon source, and ethylenediamine monohydrate was used as the nitrogen source, with their ratio controlled to hydrothermal synthesized N -CQD with N/C ratios ranging from 0 to 0.4. Notably, when the N/C ratio increases from 0 to 0.2, the N -CQD exhibits redshifted emission with excitation dependence. However, when the N/C ratio rises from 0.2 to 0.4, the N -CQD shows blueshifted emission with excitation-independence. We define it as the dual-phase emission behavior of N -CQD attributed to the transition of doping sites from graphitic nitrogen to pyridine nitrogen with increased nitrogen content. DFT calculations indicate that different doping sites influence electron transfer in N -CQD, resulting in distinct optical behaviors. Importantly, this work comprehensively explains the relationship between nitrogen content and the emission behavior of N -CQD for the first time, providing crucial insights for refining the theoretical framework of N -CQD.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Fan Gu,Tao Jiang,Xiang Ma
The intrinsic property disclosure of polymer systems by visual monitoring of photoluminescence behaviors is of great value in fundamental interest and promising applications. Three novel polymer films were obtained by simply doping methyl 9,14-diphenyl-9,14-dihydrodibenzo[a,c]phenazine-11-carboxylate (DPC) with three polymer materials. The photoluminescence behaviors of these films represented diverse fluorescence emissions from light orange to blue, especially room-temperature phosphorescence (RTP) emissions with ultralong lifetime, attributing to various configurations of DPC molecules provided by distinct microscopic environments in three polymer systems. The rigidity and regularity of polymer systems would be visually reflexed by luminescence regulation and temperature responses. In addition, irregular distribution of distinct polymer systems could be specifically monitored by both fluorescence and phosphorescence behaviors when doping different polymer materials into one blend film.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ya Li,Chao-Yu Wang,Dong-Jin Qian
Molecular arrangement and orientation of tetraphenylethylene (TPE) unit in the highly ordered thin films and aggregates can effectively limit its conformation that results in strong effect on the excited energy transfer process and luminescent behaviors under irradiation. We report here an interfacial self-assembly of metal-TPE coordination polymer (CP) ultrathin films and their aggregate-induced emission (AIE) behaviors. After connected with pyridyl or benzimidazole substituents, the tetradentate TPEs as synthesized are used as the multidentate linkers to coordinate with the Cd 2+ ions to produce aggregates in the solutions, and to form well-defined two- and three-dimensional organized Cd-TPE CP multilayers at the air-water interfaces by the Langmuir-Blodgett (LB) method. It is revealed that, in addition to the aggregation-induced emission, the following external factors have also large effects on the luminescence of TPEs , including the coordination bonding in the CPs, in plane and interlayer molecular interaction in the LB films ; both of them can restrict the intramolecular motion or rotation of TPE unit. Because of these external effects, the emission lifetime of TPEs reaches to approximately 5–10 times longer in some Cd-TPE CP LB films than that in the solutions. Further, the luminescent emission wavelengths and colors of LB films can be tuned to some extent by the in-plane and interlayer molecular interaction. Finally, it is demonstrated that the luminescent emissions and colors of the Cd-TPPE CP LB films is selectively sensing to methanol and formic acid in the gas phase with good reversibility and reproductivity.
研究领域:
材料化学
·
光物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng Du,Jun Tang,Weiping Li,Laihui Luo
To overcome the existence challenge of the luminescent materials in versatile applications, NaLuF 4 : x Eu 3+ nanopariticles and NaLuF 4 :0.15Eu 3+ @ y g-C 3 N 4 composites were designed. Under irradiation of 394 nm, dazzling red emissions with high color purity of 87.6% are observed in the NaLuF 4 : x Eu 3+ nanoparticles and the optimizing content of the dopants is 15 mol%. The electric dipole-dipole interaction leads to the concentration dependent quenching effect. Through assessing the resistance performance of the resultant nanoparticles to the temperature, the studied samples are certified to show high thermal stability. Furthermore, the proper color rendering index (80.2), low correlated color temperature (5014 K) and suitable luminous efficiency (12.1 lm/W) of packaged white light-emitting diode reveal that the NaLuF 4 :0.15Eu 3+ nanoparticles can be employed as the red component for white light-emitting diode. On account of the inconsistent photoluminescence performances of the NaLuF 4 :0.15Eu 3+ nanoparticles and g-C 3 N 4 , the thermometric properties of the NaLuF 4 :0.15Eu 3+ @ y g-C 3 N 4 composites are explored. The maximum absolute and relative sensitivities of the designed composites are 0.0057 K −1 and 0.455% K −1 , respectively, and their values are able to be manipulated via composition regulation. This work proposes a new sight into the exploitation of diverse photoluminescence behaviors of the g-C 3 N 4 and NaLuF 4 : x Eu 3+ nanoparticles to realize versatile applications.
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
危险品化学品经营许可证（带存储）