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

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.

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

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

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

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