Improved Upconversion Luminescence in Water-Soluble Yb3+/Er3+ Codoped LaF3 Nanoparticles Through Ca2+ Doping

2016 ◽  
Vol 16 (4) ◽  
pp. 3883-3885 ◽  
Author(s):  
Shihu Liu ◽  
Peng Zhang ◽  
Daguang Li ◽  
Min Lan ◽  
Zhe Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Environmentally Friendly ◽  
Polyol Process ◽  
Rare Earth Ions ◽  
Water Soluble

Monodisperse water-soluble LaF3: Yb3+/Er3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile, and environmentally-friendly polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs with a small size of 18 nm can be well dispersed in hydrophilic solutions. Meanwhile, their upconversion (UC) luminescence intensity was increased through Ca2+ doping due to the decrease of symmetry around rare earth ions.

scholarly journals Kinetics of luminescence calcium gallate activated by Yb3+, Er3+ ions

2020 ◽  
Vol 23 (3) ◽  
pp. 213-221
Author(s):  
A. P. Mar`in ◽  
U. A. Mar`ina ◽  
V. A. Vorob`ev ◽  
R. V. Pigulev
Keyword(s):  
Rare Earth ◽  
Luminescence Intensity ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Excitation Spectra ◽  
Semiconductor Laser Diode ◽  
Intracenter Luminescence ◽  
Trivalent Rare Earth ◽  
Kinetics Of

The paper presents the results of a study of the luminescent properties of calcium gallate activated by trivalent rare earth ions Yb3+ and Er3+. IR luminescence spectra of samples with a single activator Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4 were studied when excited by radiation sources with a wavelength of 940 and 790 nm, respectively. The dependence of the luminescence intensity of samples on the concentration of rare earth ions is obtained. When the two-activator composition of Ca1‑х‑yYbxEryGa2O4 is excited by a semiconductor laser diode with a wavelength of 940 nm, IR luminescence is registered in the regions of 980-1100 nm and 1450-1670 nm. The radiation in these bands corresponds to electronic transitions in Yb3+ and Er3+ ions, respectively. For a luminescence band with a maximum at a wavelength of 1540 nm, the excitation spectra were measured, the maximum intensity is at the wavelengths: 930, 941, 970, 980 nm. The dependence of the IR luminescence intensity of a solid solution of Ca1‑х‑yYbxEryGa2O4 on the concentration of Er3+ ions was studied. With an increase in the concentration of Er3+ ions in the luminescence spectra, there is a redistribution in the intensity of the bands belonging to Yb3+ and Er3+ ions, which indicates the presence of energy transfer processes between these ions. The kinetics of IR luminescence attenuation was studied for series with one and two activators: Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4, Ca1‑х‑yYbxEryGa2O4. It is established that the luminescence attenuation occurs mainly according to the exponential law, which indicates the predominance of the intracenter luminescence mechanism in the studied structures. Based on the analysis of the excitation and luminescence spectra of experimental samples, conclusions are made about the interaction of Yb3+ and Er3+ activator ions in the crystal lattice of calcium gallate.

Surface effect of nanocrystals doped with rare-earth ions enriched on surface and its application in upconversion luminescence

2012 ◽  
Vol 21 (7) ◽  
pp. 073201 ◽  
Author(s):  
En-Jie He ◽  
Ning Liu ◽  
Mao-Lian Zhang ◽  
Yan-Fu Qin ◽  
Bang-Gui Guan ◽  
...  
Keyword(s):  
Rare Earth ◽  
Surface Effect ◽  
Upconversion Luminescence ◽  
Rare Earth Ions

Optical temperature sensing using upconversion luminescence in rare-earth ions doped Ca2Gd8(SiO4)6O2 phosphors

2019 ◽  
Vol 771 ◽  
pp. 838-846 ◽  
Author(s):  
Jia Zhang ◽  
Guibin Chen ◽  
Zhangyin Zhai ◽  
Huabao Chen ◽  
Yamei Zhang
Keyword(s):  
Rare Earth ◽  
Upconversion Luminescence ◽  
Temperature Sensing ◽  
Rare Earth Ions

scholarly journals Preparation of PVA Fluorescent Gel and Luminescence of Europium Sensitized by Terbium (III)

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 893
Author(s):  
Yifan Wei ◽  
Zhengquan Fu ◽  
Hao Zhao ◽  
Ruiqi Liang ◽  
Chengyu Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Film Formation ◽  
Electronic Configuration ◽  
Rare Earth Ions ◽  
Water Soluble ◽  
Fluorescence Properties ◽  
Hydroxyl Groups ◽  
Water Soluble Polymer ◽  
Quenching Effect ◽  
Wide Range

Polyvinyl alcohol (PVA) gel has a very wide range of applications in agriculture, military, industry, and other fields. As a widely used water-soluble polymer, PVA has good mechanical properties, excellent spinnability, good hydrophilicity, remarkable physical and chemical stability, good film formation, is non-polluting, and exhibits good natural degradation and biocompatibility. It is an ideal gel preparation material. Incorporation of rare-earth elements into PVA polymers can be used to prepare rare-earth luminescent gel materials. Results show that the luminescent efficiency of complexes is mainly related to their structure, ligand substituents, synergists, and the electronic configuration of doped rare-earth ions. Fluorescent gel films were prepared by adding europium, terbium, and europium/terbium co-doped into PVA, and their fluorescence properties were compared and analyzed. It was found that, in addition to the above factors, the sensitization of terbium to europium, and the fluorescence-quenching effect of hydroxyl groups, will influence the fluorescence properties. This has opened a new route for the application of rare-earth materials and may have value in the field of new materials.

Solar Radiation Conversion With Mesoporous Silica Activated by Rare-Earth Ions

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
T. N. Nurakhmetov ◽  
K. A. Kuterbekov ◽  
D. H. Daurenbekov ◽  
A. Zh. Zhanbotin ◽  
A. A. Betekbaev ◽  
...  
Keyword(s):  
Rare Earth ◽  
Mesoporous Silica ◽  
Luminescence Intensity ◽  
Emission Band ◽  
Colloidal Silica ◽  
Rare Earth Ions ◽  
Spectroscopic Methods ◽  
Intensity Maximum ◽  
Radiation Conversion ◽  
Intracenter Transitions

Intrinsic and extrinsic nature of the luminescence of pure and Eu3+ and Tb3+ rare-earth ions activated mesoporous silica has been investigated by spectroscopic methods. Increasing the Eu3+ impurity concentration from 0.01 mg to 7 mg, results in an increase of the impurity particles radiation in the luminescent mesoporous colloidal silica (LMCS) matrix by several times. With an increase in the concentration of Tb3+ from 0.01 mg to 3 mg, impurity luminescence intensity increases several times while the intrinsic luminescence intensity maximum at 400 and 460 nm is decreasing. Based on the experimental evidence, it is suggested that the energy of the own electronic matrix excitation is transferred by emitters, i.e., impurities of Eu3+ and Tb3+ ions. Also, it is assumed that the emission band at 610 nm in an LMCS—Eu3+ and emission band at 543 nm in the LMCS—Tb3+ is attributed to the intracenter transitions within the Eu3+ and Tb3+ ions.

Femtosecond Laser-Induced Upconversion Luminescence in Rare-Earth Ions by Nonresonant Multiphoton Absorption

2016 ◽  
Vol 120 (28) ◽  
pp. 5522-5526 ◽  
Author(s):  
Yunhua Yao ◽  
Cheng Xu ◽  
Ye Zheng ◽  
Chengshuai Yang ◽  
Pei Liu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Femtosecond Laser ◽  
Upconversion Luminescence ◽  
Rare Earth Ions ◽  
Multiphoton Absorption
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