Nanophotonics
·
2019
·Vol. 8
·期 12
·2215-2223
·
IF 6.908
Er Pan,Gongxun Bai,Yutao Peng,Liang Chen,Shiqing Xu
Ferroelectric oxide nanocrystals, in combination with the robust coupling of an electric field with crystal structure symmetry, makes such systems agreeable to field-induced crystal structural transformation. The luminescent properties of rare earth ions are sensitive to the symmetry of the surrounding crystal field. The luminescence tuning of rare earth ions is an important assignment in the research of luminescent materials. However, the current conditional feasibility and reversibility in the exploration of luminescence modification remain major challenges. In this article, the luminescence modulation of rare earth ions has been developed in Yb 3+ /Er 3+ codoped ferroelectrics glass ceramics containing Bi 4 Ti 3 O 12 nanocrystals through an electric field. The inclusion of nanocrystals in the glass matrix greatly enhances the electrical resistance. Both upconversion and near-infrared emissions of rare earth ions are effectively enhanced more than twice via polarization engineering. The electric field regulates the photonic properties of rare earth ions with excellent reversibility and nonvolatility in ferroelectrics. The effective modification by electric field provides a new scheme for optical storage and optoelectronic devices.
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
OPTICAL MATERIALS
·
2012
·
IF 2.023
Zhengwen Yang,Jialun Zhu,Dong Yan,Hangjun Wu,Rongfei Wang,Zhiguo Song,Xue Yu,Yong Yang,Dacheng Zhou,Zhaoyi Yin,Jianbei Qiu
Upconversion inverse opal photonic crystals based on a luminescent matrix of Yb, Er co-doped Y 2 Ti 2 O 7 were synthesized, and their photoluminescence was investigated. By comparing the spectra of the inverse opals with that of the reference sample, the contribution of photonic band gap effect to the upconversion emission was observed in the Y 2 Ti 2 O 7 : Yb, Er inverse opals. Intensity of the green or red upconversion emission from Er 3+ was depressed when the overlapping between the photonic band-gap and Er 3+ ions emission band occurs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81542-81551
·
IF 3.289
Shuwen Zhao,Wei Liu,Xianya Xue,Yushi Yang,Zhiyong Zhao,Youfa Wang,Bin Zhou
In this work, a new strategy to enhance upconversion emission has been realized for the first time, based on β-NaGdF4:Yb3+, Er3+ nanocrystals (UCNC) using tridoping with magnesium (Mg2+) ions. X-ray diffraction (XRD) and inductively coupled plasma–atomic emission spectroscopy data indicated successful incorporation of the Mg2+ ions in β-NaGdF4:Yb3+, Er3+. The effect of the Mg2+ tridopant on the crystal structure, upconversion luminescence, and paramagnetization in β-NaGdF4:Yb3+, Er3+ was investigated in detail. The red, green and violet emission intensities were clearly enhanced and the maximum emission intensities were enhanced by about 9, 6, and 7 times, respectively, by tridoping with 13.5 mol% Mg2+ ions. The possible mechanism for enhancing upconversion emission was determined by the alteration of inter-ionic distance and the distortion of crystal structure based on the XRD data. The paramagnetic property can be modulated by the introduction of Mg2+ ions and the core–shell structure, and this can be ascribed to the change in the gadolinium molar percentage. Additionally, a synergistic effect on emission intensity enhancement was observed in a Mg2+-doped core–shell structure. At last, an improved ligand exchange method has been designed to render oleic acid-stabilized 13.5 mol% Mg2+-doped UCNCs dispersible in water and their three day cytotoxicity was assayed using stem cells. It is expected that this material could be applied in biomedical nanoprobes, bioseparation, magnetic resonance imaging, and so on.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Chuanying Wang,Xianhua Cheng
In this work, β-NaYF 4 :Yb,Er upconversion (UC) film was successfully prepared on silicon (Si) substrate via self-assemble method for the first time. The chemical composition and surface morphology of the UC film were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), water contact angle (WCA), X-ray power diffraction (XRD), and scanning electron microscopy (SEM) measurements. To investigate the effects of KH-560 primer film and chemical reactions on the UC luminescence properties of β-NaYF 4 :Yb,Er UC film, decay profiles of the 540 nm and 655 nm radiations were measured. Furthermore, tribological test was applied to qualitatively evaluate the adhesion of the UC film. The results indicate that the UC film has been successfully prepared on Si substrate by covalent chemical bonds. This work provides a facile way to synthesize β-NaYF 4 :Yb,Er UC film with robust adhesion to the substrate, which can be applicable for other UC films.
研究领域:
材料科学
·
光学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Zhenlin Wang,Anze Shui,Hulei Yu,Mei Cai
Photocatalysis presents a promising solution for environmental remediation, though conventional photocatalysts remain constrained to the ultraviolet and partially visible regions of the solar spectrum. To address this limitation, we developed a NaYF 4 :Yb,Er/BiOBr (N/B) composite photocatalyst, leveraging upconversion luminescence to convert near-infrared photons into visible light while utilizing BiOBr's narrow bandgap for enhanced visible-light absorption. The composite photocatalyst was fabricated via a two-step solvothermal approach and evaluated for the degradation of methyl orange (MO). Remarkably, the N/B-120°C sample demonstrated superior photocatalytic activity, achieving degradation rates 2.4- and 5.4-fold higher than those of pristine BiOBr and commercial TiO 2 (P25), respectively. This enhanced performance is attributed to synergistic effects including an increased specific surface area (23.96 m 2 /g for N/B-120°C vs. 16.28 m 2 /g for BiOBr), reduced charge transfer resistance (as evidenced by electrochemical impedance spectroscopy (EIS) Nyquist plots), elevated oxygen vacancy concentration (as verified by x-ray photoelectron spectroscopy [XPS]), and extended solar spectral utilization range (400–980 nm). This work presents a viable strategy to improve the efficiency of photocatalysis.
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Barbara Ting Wei Ang,Yin Mei Fong,Chew Beng Soh,Szu-Cheng Chien,Hui An,Ryan Hong Soon Tay
Tropical urban greenhouses are prone to heat trapping due to higher daily temperatures compared to temperate climates, and a high energy cost is required to maintain optimal growth conditions. Lanthanide-based nanoparticles are known for their capability of performing upconversion, a process where lower energy photons are absorbed and converted to a single photon of higher energy. These upconversion nanoparticles (UCNPs) possess the innate ability to convert infrared energy to visible light, thereby facilitating efficient heat removal while simultaneously providing upconverted visible light. Consequently, the incorporation of such material into greenhouse façades presents an attractive zero-energy alternative to commonly used greenhouse cooling technologies. In this study, NaYF4:Yb3+/Er3+ UCNPs were synthesized and coated onto a simulated greenhouse enclosure with Pak Choi plants to observe the effect of such a film coating on actual crop growth. A reduction of the interior temperature, increased sunlight diffusion, and improved crop yield were demonstrated in this work, showing promising results for future urban greenhouse façade applications.
研究领域:
农业科学
·
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CLUSTER SCIENCE
·
2020
·Vol. 32
·期 6
·1683-1691
·
IF 1.731
Liang Xuhua,Fan Jun,Zhao Yanyan,Jin Ruyi
A core–shell-structured composite by combining mesoporous silica with upconversion luminescence (UCL) property had considerable application potentials in the fields of drug delivery, disease diagnosis, and therapy. In this paper, a monodisperse, core–shell-structured NaYF 4 :Yb,Er@ n SiO 2 @ m SiO 2 nanoparticle (UCNP@MSNs-FA) with excellent UCL property was successfully fabricated by a facile two-step sol–gel strategy and by modifying the surface with folic acid (FA) to strengthen its tumor-targeting performance. The properties of the composite were studied extensively, which indicated that UCNP@MSNs-FA possessed good dispersion, typical core–shell-structured with high specific surface area (132.775 m 2 /g), and excellent UCL property that improve cell imaging and drug delivery. The viability of L929 cells and hemolysis assay demonstrated the good biocompatibility of the composite. By using doxorubicin hydrochloride (DOX) as a model drug, the drug loading content and encapsulation efficiency of UCNP@MSNs-FA could reach as high as 11.2% and 37.3%, respectively, which proved the effectiveness to load anticancer drugs. In addition, the DOX-UCNP@MSNs-FA system exhibited sustained drug release and strong pH-dependent performance, in which the drug release would be accelerated at the slightly acidic microenvironment in the tumor. Moreover, experimental results indicated that DOX-UCNP@MSNs-FA exhibited specific cytotoxicity to KB cells but weakened toxicity to FR-negative cells. Therefore, the as-prepared UCNP@MSNs-FA could be used potential for simultaneous targeted anti-cancer drug delivery and cell imaging and enhance the therapeutic efficacy against FR-positive tumor cells.
研究领域:
纳米医学
·
生物材料
·
癌症治疗
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Chaoqing Yang,Jing Liu,Liyana Ma,Aoju Li,Zhongxin Liu
Graphene oxide/GdF 3 : Yb, Er (GO/GdF 3 ) nanocomposite have been successfully synthesized via a facile low-temperature hydrothermal route, in which fusiform orthorhombic phase GdF 3 : Yb, Er nanocrystals with uniform size could grow in the graphene oxide substrate. During the annealing of GO/GdF 3 nanocomposites, a structure change from GO/GdF 3 nanocomposites to reduced graphene oxide/NaGdF 4 : Yb, Er (rGO/NaGdF 4 ) nanocomposites was discovered by X-ray powder diffraction, Fourier transform infrared spectroscopy, Thermogravimetric analysis and Scanning electron microscope. Under the excitation of 980 nm, the upconversion luminescence of GO/GdF 3 was completely quenched by the energy receptor in GO substrate, however the black rGO/NaGdF 4 showed improved green upconversion luminescence. Based on the analysis of energy transfer in the nanocomposites, the improvement of the upconversion luminescence of the rGO/NaGdF 4 can be attributed to the structure change of nanocomposites.
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 Physical Chemistry C
·
2017
·
IF 4.536
Yiru Zhu,Shuwen Zhao,Bin Zhou,Hao Zhu,Youfa Wang
In this work, we report a phenomenon that upconversion emission intensity of Er3+ was enhanced by cadmium. Cd2+ was taken with 0, 3, 10, 20, 30, and 40 mol % as a new dopant to codope LiY0.78Yb0.20Er0.02F4, meanwhile the doping effects on the crystal structure, morphology, and upconversion fluorescence emission are investigated by XRD, Rietveld refinement, TEM, and upconversion spectroscopy analysis methods in detail. The green upconversion emission intensity was enhanced, and the maximum emission intensities were enhanced to twice when 10 mol % Cd2+ was codoped into tetragonal LiYF4, while its decay lifetime was reduced. Additionally, we further designed the synthesis of the homogeneous LiYF4:20%Yb,2%Er,10%Cd@LiYF4 of which the emission intensity is 11 times higher than that of the Cd2+-free nanocrystals, meanwhile an intriguing morphology of core–shell nanocrystals was obtained. This investigation may be useful for the design and improvement of upconversion materials for fulfilling the prerequisite of the practical application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Qianqian Song,Hao Chen,Kanghui Zheng,Yueling Lai,Zhongshan Li,Xin Yang,Ruilin Wang,Yufeng Zhou
Lanthanide-doped upconversion nanoparticles (UCNPs) are extensively used in spectral conversion layers of photovoltaic (PV) devices to capture near-infrared (NIR) light. However, surface quenching effects and low upconversion quantum yield (UC QY) of UCNPs limit their utilizations in PV devices. In this work, novel multishell NaYF 4 @NaYF 4 : Yb, Er@NaYF 4 (CSS) UCNPs have been synthesized via thermal decomposition method. The CSS UCNPs exhibit enhanced UC emission intensity by 36.33 times and UC QY by 38 times with respect to those of NaYF 4 : Yb, Er UCNPs, with a significant increase in fluorescence lifetime. After incorporating CSS UCNPs with Cadmium Telluride (CdTe) solar cells, the device achieved a power conversion efficiency (PCE) of 16.02% under AM 1.5G illumination, a 5.9% increase compared to the bare CdTe solar cell, and exhibited more than a 76-fold enhancement in efficiency under 980 nm excitation. This study demonstrates the synergistic effects of the multilayer shell structural UCNPs with enhanced luminescence and engineered interfaces between CdTe and back electrode, offering a scalable strategy for efficient infrared-responsive photovoltaic devices.
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产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Huihui Wang,Yunyun Lu,Lun Wang,Hongqi Chen
A selective, simple and environment-friendly type fluorescence sensing platform between upconversion nanoparticles (UCNPs) and melanin-like polymer utilizing the photoinduced electron-transfer (PET) mechanism was developed. The effective fluorescence quenching of UCNPs by melanin-like polymers could detect tyramine and tyrosinase (TYR) activity through the bio-catalysed oxidation of tyramine to the melanin-like polymer products. At optimal conditions, the range of linearity in detection was 0.167–33.3 μΜ for tyramine, and the limit of detection of tyramine was 0.026 μΜ. The linear range of TYR was 0.0033–1 U·mL −1 , and the limit of detection of TYR was 0.003 U·mL −1 . Furthermore, the strategy could be applied to real sample analysis with satisfactory results.
研究领域:
生物化学
·
分析化学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Hongqi Chen,Wen Wang,Changchun Ji,Lun Wang
The core–shell NaGdF 4 :Yb,Er@NaGdF 4 :Yb,Nd upconversion nanoparticles (UCNPs) were successfully obtained with the method of co-precipitation, and the water-solubility of UCNPs was improved by the ligand exchange reaction between nitrosyl tetrafluoroborate (NOBF 4 ) and nanoparticles. The IR-783 dye with negative charge and NOBF 4 -UCNPs with positive charge can bind together by electrostatic action to sensitize UCNPs through the energy transfer from IR-783 to UCNPs. However, with the presence of Na 2 S (a commonly used H 2 S donor), a highly selective reaction between H 2 S and IR-783, which destoried the structure of IR-783 and blocked the energy transfer, thus led to the quenching of luminescent intensity. Based on this, a sensing system for determination of H 2 S has been constructed successfully. The linear range of H 2 S detection by this system is 0.5–15 μM, and the detection limit is 34.17 nM. Furthermore, the dye-sensitized core–shell NaGdF 4 :Yb,Er@NaGdF 4 :Yb,Nd upconversion nanoprobe was applied to real sample analysis with satisfactory results.
研究领域:
分析化学
·
纳米技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）