scholarly journals Lanthanide-Doped Luminescent Nanophosphors via Ionic Liquids

2021 ◽  
Vol 9 ◽  
Author(s):  
Rahul Kumar Sharma ◽  
Pushpal Ghosh

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).

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33467-33476 ◽  
Author(s):  
Pushpal Ghosh ◽  
Rahul Kumar Sharma ◽  
Yogendra Nath Chouryal ◽  
Anja-Verena Mudring

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.


2018 ◽  
Vol 6 (23) ◽  
pp. 6270-6279 ◽  
Author(s):  
Talita Jordanna de Souza Ramos ◽  
Guilherme Henrique Berton ◽  
Tania Maria Cassol ◽  
Severino Alves Júnior

Herein, we describe for the first time room temperature ionic liquids (RTILs) and imidazole-based cations with appended carboxylic acids as terminals, which are directly derived from the anhydrides.


Author(s):  
Christopher M. Phenicie ◽  
Paul Stevenson ◽  
Sacha Welinski ◽  
Brendon C. Rose ◽  
Abraham T. Asfaw ◽  
...  

Talanta ◽  
2012 ◽  
Vol 90 ◽  
pp. 132-137 ◽  
Author(s):  
Xiaoqi Sun ◽  
Huimin Luo ◽  
Sheng Dai

2015 ◽  
Vol 44 (3) ◽  
pp. 1379-1387 ◽  
Author(s):  
Alok Rout ◽  
Koen Binnemans

The mechanism for extraction of rare-earth ions by a solvating extractant to a bis(trifluoromethylsulfonyl)imide ionic liquid depends on the hydrophilicity of the ionic liquid cation.


Author(s):  
N. M. P. Low ◽  
L. E. Brosselard

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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