A facile methodology for regulating the size of hexagonal NaYF4:Yb3+,Er3+ upconversion nanocrystals

2017 ◽  
Vol 41 (20) ◽  
pp. 11521-11524 ◽  
Author(s):  
Dongdong Li ◽  
Wen-Yong Lai ◽  
Qiyue Shao ◽  
Wei Huang
Keyword(s):  
Rare Earth ◽  
Oleic Acid ◽  
Upconversion Nanocrystals ◽  
Work Size ◽  
Size Adjustment

The novelty of the work: size adjustment of hexagonal NaYF4:Yb3+,Er3+ upconversion nanocrystals by varying only the ratio of oleic acid to rare-earth acetates.

Hexagonal-phase NaREF4 upconversion nanocrystals: the matter of crystal structure

Nanoscale ◽  
2021 ◽  
Author(s):  
Rui Shi ◽  
Carlos D S Brites ◽  
Luis Antonio Dias Carlos
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Hexagonal Phase ◽  
Upconversion Nanocrystals ◽  
Luminescence Performance

The hexagonal-phase (β) of NaREF4 upconversion nanocrystals (RE = rare earth elements) has been widely employed because of the outstanding luminescence performance, yet less is known about the essence of...

Local precipitation of upconversion nanocrystals in rare-earth-doped oxyfluoride glasses by laser irradiation

2004 ◽  
Author(s):  
Hidekazu Hashima ◽  
Akio Konishi ◽  
Yoshinori Tanigami ◽  
Daisuke Shibata ◽  
Yoji Kawamoto
Keyword(s):  
Rare Earth ◽  
Laser Irradiation ◽  
Oxyfluoride Glasses ◽  
Upconversion Nanocrystals ◽  
Rare Earth Doped

scholarly journals Facile Chemical Synthesis of Doped ZnO Nanocrystals Exploiting Oleic Acid

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1150 ◽  
Author(s):  
Sugata Barui ◽  
Roberto Gerbaldo ◽  
Nadia Garino ◽  
Rosaria Brescia ◽  
Francesco Laviano ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Rare Earth ◽  
Oleic Acid ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Rare Earth Elements ◽  
Resonance Imaging ◽  
Metal Elements ◽  
Doped Zno ◽  
Transition Metal Elements

Zinc oxide nanocrystals (ZnO-NCs) doped with transition metal elements or rare earth elements can be probed for magnetic resonance imaging to be used as a molecular imaging technique for accurate diagnosis of various diseases. Herein, we use Mn as a candidate of transition metal elements and Gd as a presenter of rare earth elements. We report an easy and fast coprecipitation method exploiting oleic acid to synthesize spherical-shaped, small-sized doped ZnO-NCs. We show the improved colloidal stability of oleate-stabilized doped ZnO-NCs compared to the doped ZnO-NCs synthesized by conventional sol–gel synthesis method, i.e., without a stabilizing agent, especially for the Mn dopant. We also analyze their structural, morphological, optical, and magnetic properties. We are able to characterize the persistence of the crystalline properties (wurtzite structure) of ZnO in the doped structure and exclude the formation of undesired oxides by doping elements. Importantly, we determine the room-temperature ferromagnetism of the doped ZnO-NCs. This oleate-stabilized coprecipitation method can be subjected as a standard procedure to synthesize doped and also co-doped ZnO-NCs with any transition metal elements or rare earth elements. In the future, oleate-stabilized Gd/Mn-doped ZnO-NCs can be exploited as magnetic resonance imaging (MRI) contrast agents and possibly increase the signal intensity on T1-weighted images or reduce the signal intensity on T2-weighted images.

Temperature-dependent upconversion luminescence and dynamics of NaYF4:Yb3+/Er3+ nanocrystals: influence of particle size and crystalline phase

2014 ◽  
Vol 43 (16) ◽  
pp. 6139-6147 ◽  
Author(s):  
Wei Yu ◽  
Wen Xu ◽  
Hongwei Song ◽  
Shuang Zhang
Keyword(s):  
Particle Size ◽  
Oleic Acid ◽  
Crystalline Phase ◽  
Upconversion Luminescence ◽  
Temperature Dependent ◽  
Crystalline Phases ◽  
Upconversion Nanocrystals

Oleic acid-capped NaYF4:Yb3+/Er3+ upconversion nanocrystals with different sizes and crystalline phases were prepared, and their temperature-dependent upconversion luminescence and dynamics were studied.

Spectroscopic research of upconversion nanomaterials based on complex oxide compounds doped with rare-earth ion pairs: Benefit for cancer diagnostics by upconversion fluorescence and radio sensitive methods/Spektroskopische Untersuchung von mit Ionenpaaren Seltener Erden dotierten Upconversion-Nanokompositen: Nutzen für die Krebsdiagnostik durch Upconversion-Fluoreszenz und strahlungssensitive Methoden

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Anastasia V. Ryabova ◽  
Daria V. Pominova ◽  
Victoria A. Krut’ko ◽  
Maria G. Komova ◽  
Victor B. Loschenov
Keyword(s):  
Rare Earth ◽  
Upconversion Luminescence ◽  
Ion Pairs ◽  
Biological Tissues ◽  
Cancer Diagnostics ◽  
Inorganic Nanoparticles ◽  
Deep Penetration ◽  
Rare Earth Ion ◽  
Biological Studies ◽  
Upconversion Nanocrystals

AbstractHighly photochemically stable nanoparticles, in which upconversion luminescence can be excited – so-called upconversion nanocrystals (UC-NCs) – exhibit widely separated (up to 500 nm) narrow luminescence bands in the visible (VIS) region located far from the excitation near-infrared (NIR) laser radiation, and thus can be more easily identified compared to organic luminophores and semiconductor nanoparticles. Due to a deep penetration of exciting infrared (IR) radiation, the absence of parasitic fluorescence of biomolecules and the absence of phototoxicity and photobleaching upon near IR excitation, UC-NCs can be efficiently used as fluorescent probes in biological studies and fluorescence diagnostics (FD). The doping of such nanoparticles with GdWe studied the upconversion characteristics of inorganic nanoparticles made of different materials doped with rare-earth ion (REI) pairs YbBased on the results obtained, the matrix LaThe investigated complex polycrystalline oxide compounds are promising as diagnostic agents for biological tissues visualization by fluorescence, light scattering, and nuclear magnetic resonance imaging.

Preparation and Optical Properties of Rare Earth Doped Y2O3 Nanoparticles Synthesized by Thermal Decomposition with Oleic Acid

2011 ◽  
Vol 332-334 ◽  
pp. 1974-1978 ◽  
Author(s):  
N. Takahashi ◽  
A. Gubarevich ◽  
J. Sakurai ◽  
S. Hata ◽  
T. Tsuge ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Rare Earth ◽  
Oleic Acid ◽  
Oxide Nanoparticles ◽  
Strong Fluorescence ◽  
Fluorescent Intensity ◽  
Decomposition Time ◽  
Metal Oleate ◽  
Rare Earth Doped ◽  
Yttrium Oxide Nanoparticles

The synthesis by thermal decomposition of rare earth doped yttrium oxide nanoparticles was investigated. The elements of the rare earth were europium, which showed strong fluorescence, and erbium, which indicated upconversion properties. Metal-oleate complex was used as a precursor. The results of Scherrer’s equation and SEM indicated that nanoparticles were successfully synthesized. Appropriate thermal decomposition time increased fluorescence intensity of europium activators by completion of thermal decomposition of oleic acid, while too long thermal decomposition time decreased the fluorescent intensity. Fluorescence of erbium activator was observed after annealing, while it was not observed before annealing because of stronger fluorescence of oleylamine.

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