scholarly journals Size of the rare-earth ions: a key factor in phase tuning and morphology control of binary and ternary rare-earth fluoride materials

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33467-33476 ◽  
Author(s):  
Pushpal Ghosh ◽  
Rahul Kumar Sharma ◽  
Yogendra Nath Chouryal ◽  
Anja-Verena Mudring
Keyword(s):  
Rare Earth ◽  
Lattice Strain ◽  
Morphology Control ◽  
Rare Earth Ions ◽  
Crystal Phase ◽  
Luminescence Properties ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Key Factor ◽  
Phase Tuning

An IL based solvothermal route to prepare RE ion doped luminescent binary/ternary fluoride nanomaterials. Size of the RE ions tunes the nature of the product, crystal phase, lattice strain and morphology, effecting the luminescence properties.

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.

Self-assembled hollow rare earth fluoride alloyed architectures with controlled crystal phase and morphology

CrystEngComm ◽  
2012 ◽  
Vol 14 (22) ◽  
pp. 7764 ◽  
Author(s):  
Zhiming Chen ◽  
Qun Zhao ◽  
Guojin Feng ◽  
Zhirong Geng ◽  
Zhilin Wang
Keyword(s):  
Rare Earth ◽  
Crystal Phase ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Self Assembled

scholarly journals Lanthanide-Doped Luminescent Nanophosphors via Ionic Liquids

2021 ◽  
Vol 9 ◽  
Author(s):  
Rahul Kumar Sharma ◽  
Pushpal Ghosh
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Lattice Strain ◽  
Phase Morphology ◽  
Rare Earth Ions ◽  
Crystal Phase ◽  
Ability To Act ◽  
Host Materials ◽  
Nanomaterials Synthesis ◽  
Doped Nanomaterials

Lanthanide (Ln3+) ion(s)-doped or rare-earth ion(s)-doped nanomaterials have been considered a very important class of nanophosphors for various photonic and biophotonic applications. Unlike semiconductors and organic-based luminescent particles, the optical properties of Ln3+-doped nanophosphors are independent of the size of the nanoparticles. However, by varying the crystal phase, morphology, and lattice strain of the host materials along with making core-shell structure, the relaxation dynamics of dopant Ln3+ ions can be effectively tuned. Interestingly, a judicious choice of dopant ions leads to unparallel photophysical dynamics, such as quantum cutting, upconversion, and energy transfer. Recently, ionic liquids (ILs) have drawn tremendous attention in the field of nanomaterials synthesis due to their unique properties like negligible vapor pressure, nonflammability, and, most importantly, tunability; thus, they are often called “green” and “designer” solvents. This review article provides a critical overview of the latest developments in the ILs-assisted synthesis of rare-earth-doped nanomaterials and their subsequent photonic/biophotonic applications, such as energy-efficient lighting and solar cell applications, photodynamic therapy, and in vivo and in vitro bioimaging. This article will emphasize how luminescence dynamics of dopant rare-earth ions can be tuned by changing the basic properties of the host materials like crystal phase, morphology, and lattice strain, which can be eventually tuned by various properties of ILs such as cation/anion combination, alkyl chain length, and viscosity. Last but not least, different aspects of ILs like their ability to act as templating agents, solvents, and reaction partners and sometimes their “three-in-one” use in nanomaterials synthesis are highlighted along with various photoluminescence mechanisms of Ln3+ ion like up- and downconversion (UC and DC).

BaCaLu2F10:Ln3+ (Ln = Eu, Dy, Tb, Sm, Yb/Er, Yb/Ho) spheres: ionic liquid-based synthesis and luminescence properties

CrystEngComm ◽  
2018 ◽  
Vol 20 (40) ◽  
pp. 6173-6182 ◽  
Author(s):  
Wei Liu ◽  
Qi Sun ◽  
Ming Yan ◽  
Yanhua Song ◽  
Xiuqing Zhou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Luminescence Properties ◽  
Alkaline Earth Metal ◽  
Hydrothermal Route ◽  
Rare Earth Fluoride ◽  
Earth Fluoride

Alkaline earth metal rare earth fluoride BaCaLu2F10:Ln3+ (Ln = Eu, Dy, Tb, Sm, Yb/Er, Yb/Ho) submicrospheres with uniform morphology and size were synthesized via a facile ionic liquid-based hydrothermal route. The down- and up-conversion luminescence has been investigated.

Thermal Decomposition of Rare Earth Fluoride Hydrates

Science ◽  
1959 ◽  
Vol 129 (3352) ◽  
pp. 842-842 ◽  
Author(s):  
W. W. WENDLANDT ◽  
B. LOVE
Keyword(s):  
Thermal Decomposition ◽  
Rare Earth ◽  
Rare Earth Fluoride ◽  
Earth Fluoride

High-pressure Syntheses and Characterization of the Rare-earth Fluoride Borates RE2(BO3)F3 (RE=Tb, Dy, Ho)

2013 ◽  
Vol 68 (11) ◽  
pp. 1198-1206 ◽  
Author(s):  
Ernst Hinteregger ◽  
Michael Enders ◽  
Almut Pitscheider ◽  
Klaus Wurst ◽  
Gunter Heymann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rare Earth ◽  
Monoclinic Space Group ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Structure Determinations ◽  
New Compounds ◽  
Rare Earth Fluorides

The new rare-earth fluoride borates RE2(BO3)F3 (RE=Tb, Dy, Ho) were synthesized under highpressure/ high-temperature conditions of 1:5 GPa=1200 °C for Tb2(BO3)F3 and 3:0 GPa=900 °C for Dy2(BO3)F3 and Ho2(BO3)F3 in a Walker-type multianvil apparatus from the corresponding rareearth sesquioxides, rare-earth fluorides, and boron oxide. The single-crystal structure determinations revealed that the new compounds are isotypic to the known rare-earth fluoride borate Gd2(BO3)F3. The new rare-earth fluoride borates crystallize in the monoclinic space group P21/c (Z = 8) with the lattice parameters a=16:296(3), b=6:197(2), c=8:338(2) Å , b =93:58(3)° for Tb2(BO3)F3, a= 16:225(3), b = 6:160(2), c = 8:307(2) Å , b = 93:64(3)° for Dy2(BO3)F3, and a = 16:189(3), b = 6:124(2), c = 8:282(2) Å , β= 93:69(3)° for Ho2(BO3)F3. The four crystallographically different rare-earth cations (CN=9) are surrounded by oxygen and fluoride anions. All boron atoms form isolated trigonal-planar [BO3]3- groups. The six crystallographically different fluoride anions are in a nearly planar coordination by three rare-earth cations.

scholarly journals Investigation on the Luminescence Properties of InMO4 (M = V5+, Nb5+, Ta5+) Crystals Doped with Tb3+ or Yb3+ Rare Earth Ions

ACS Omega ◽  
2020 ◽  
Vol 5 (5) ◽  
pp. 2148-2158 ◽  
Author(s):  
Pablo Botella ◽  
Francesco Enrichi ◽  
Alberto Vomiero ◽  
Juan E. Muñoz-Santiuste ◽  
Alka B. Garg ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Luminescence Properties

In situ high temperature NMR and EXAFS experiments in rare-earth fluoride molten salts

2004 ◽  
Vol 7 (12) ◽  
pp. 1135-1140 ◽  
Author(s):  
Anne-Laure Rollet ◽  
Catherine Bessada ◽  
Aïdar Rakhmatoulline ◽  
Yannick Auger ◽  
Philippe Melin ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Molten Salts ◽  
Rare Earth Fluoride ◽  
Earth Fluoride
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