JOURNAL OF LUMINESCENCE
·
2015
·
IF 2.719
Yan Song,Guixia Liu,Xiangting Dong,Jinxian Wang,Wensheng Yu
Luminescence resonance energy transfer (LRET) system can be constructed using NaYF 4 :Tb 3+ luminescence nanocrystals and gold nanoparticles (AuNPs) served as energy donor and acceptor, respectively. The AuNPs modified by cetyltrimethylammonium bromide (CTAB) were synthesized first and NaYF 4 :Tb 3+ shells encapsulated Au cores via a hydrothermal method . The synthesized materials were well characterized by X-ray diffraction (XRD), Fourier-transform infrared spectra (FT-IR), Transmission electron microscopy (TEM), X-ray photoelectron spectrum (XPS), UV–vis absorption spectra (UV–vis) and photoluminescence (PL) measurement. The results indicate that the synthesized Au@NaYF 4 :Tb 3+ core–shell nanoparticles have spherical morphology with a size of 80–90 nm and the shell layers of NaYF 4 :Tb 3+ nanocrystals have pure cubic structure. The luminescence properties of Au@NaYF 4 :Tb 3+ core–shell nanoparticles are same as those of NaYF 4 :Tb 3+ particles. The LRET process was realized using the core–shell nanoarchitectures due to the absorption spectrum of AuNPs matches well with the major emission peaks of Tb 3+ ions. The LRET experiments have successfully verified the energy transfer between NaYF 4 :Tb 3+ nanocrystals and AuNPs. Additionally, the emission intensities of Tb 3+ ions and the content of AuNPs exhibited a fair linear correlation.
研究领域:
材料科学
·
光物理学
·
纳米技术
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 16
·期 29
·15139-15145
·
IF 4.198
Yan Song,Guixia Liu,Jinxian Wang,Xiangting Dong,Wensheng Yu
A core–shell hybrid nanostructure was prepared by combining NaYF4 doped with the lanthanide dopant Tb3+ as shell layer materials and noble metal nanoparticles (Au and Ag) as cores. For the core–shell system, the luminescence resonance energy transfer (LRET) was demonstrated, in which noble metal nanoparticles as fluorescence quenchers can absorb the emission energy of the α-NaYF4:Tb3+ donor. The morphology, structure, composition and properties of the as-prepared samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption and photoluminescence (PL) spectroscopy, respectively. In the Au/Ag@NaYF4:Tb3+ system, it is observed that the plasmonic absorption bands of gold or silver nanoparticles overlap with the emission bands of 5D4 → 7Fj (j = 6, 5) transition of the Tb3+ ions, and the emission intensity of the 5D4 → 7F5 transition is clearly attenuated. The photoluminescence decay curve measurements show that the lifetimes of the 5D4 → 7F6 and 5D4 → 7F5 transitions of Tb3+ are slightly decreased in the presence of gold or silver cores. The quenching efficiency of the gold and silver nanoparticles implies that the efficiency of energy transfer is highly dependent on the extent of spectral overlap in the LRET system.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yue Hu,Yanmin Yang,Xuefeng Zhang,Xin Wang,Xiaoxiao Li,Yunqian Li,Tianyi Li,Hongwu Zhang
Here, an X-ray-excited super-long afterglow phosphor β-NaYF4:Tb3+ has been discovered for the first time. After X-ray irradiation, the green emission can persist for more than 240 h. After 120 h, the power density of afterglow reached 3.76 × 10–6 W·m–2, which can be clearly observed by the naked eye under dark vision. Also, combined with the results of thermoluminescence and photoluminescence, the super-long afterglow emission of β-NaYF4:Tb3+ can be ascribed to the tunneling model associated with F centers. More importantly, the super-long green afterglow emission of β-NaYF4:Tb3+ has been successfully used as an in vivo light source to activate g-C3N4 for photodynamic therapy and bacteria destruction. Furthermore, super-long persistent luminescence of β-NaYF4:Tb3+ could be repeatedly charged by X-rays for many cycles, which indicates that the phosphors have high photostability under repeated cycles of alternating X-ray irradiation.
研究领域:
材料科学
·
医学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Lin Lin,Zhipeng Yu,Zhezhe Wang,Zhuohong Feng,Feng Huang,Lili Huang,Qionghua Dai,Fengfen Zhang,Zhiqiang Zheng
Au@SiO 2 /NaYF 4 :Tb 3+ ,Yb 3+ @NaYF 4 nanocomposites are acquired by combining Au@SiO 2 nanorods with ligand-free NaYF 4 :Tb 3+ ,Yb 3+ @NaYF 4 nano-particles in water solution due to the electrostatic attraction. Plasmon-enhanced upconversion (UC) and quantum-cutting (QC) are both obtained and optimized in these nanocomposites by adjusting SiO 2 shell thickness and concentrations of Au@SiO 2 . While the thickness of SiO 2 shell is 35 nm, the enhancement factor of UC and QC reaches maximum as 1.91 and 3.47 times, respectively. The nanocomposites may be applied in biological fluorescence label, super-resolution imaging and solar cells, etc.
研究领域:
纳米技术
·
光学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）