Influence of NaOH Quantity upon the Size and Luminescent Property of Core-Shell Gd2O3:Tb3+ /SiOx Nanoparticles

2013 ◽  
Vol 813 ◽  
pp. 323-326
Author(s):  
Mei Gui Ou ◽  
Chun Lin Yang ◽  
Shao Han Cai ◽  
Pascal Perriat
Keyword(s):  
Energy Transfer ◽  
Luminescent Property ◽  
Emission Intensity ◽  
Core Shell ◽  
Mixed Solution ◽  
Shell Nanoparticles ◽  
Polyol Medium ◽  
Size Of Particles ◽  
Core Shell Nanoparticles

Nanostuctured Tb3+-doped Gd203particles were synthesized from chloride precursors GdCl3and TbCl3by NaOH addition in a polyol medium. Then, Gd203: Tb3+particles were encapsulated in a polysioxane shell by being immersed in a mixed solution of APTES and TEOS. Effect of NaOH quantity on size and luminescent property of obtained core-shell nanoparticles was studied. The result shows that the size of nanoparticles increased with the increase of NaOH quantity from 30% to100% of stoichiometry. The emission intensity of core-shell nanoparticles increased with the size of particles due to the enhancement of energy transfer between core and shell.

scholarly journals Near-infrared upconversion of Nd through Gd-mediated interfacial energy transfer in core-shell nanoparticles

2018 ◽  
Vol 8 (8) ◽  
pp. 2449 ◽  
Author(s):  
Lili Tao ◽  
Xuelong Liu ◽  
Junshan He ◽  
Yajun Lou ◽  
Yonghui Li ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Interfacial Energy ◽  
Near Infrared ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Preparation and Study of Rare Earth Oxide Nanoparticles with Core-Shell Structure

2013 ◽  
Vol 813 ◽  
pp. 332-335
Author(s):  
Mei Gui Ou ◽  
Chun Lin Yang ◽  
Shao Han Cai ◽  
Qi Wei Zhu
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Precursor Solution ◽  
Rare Earth Oxide ◽  
Oxide Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Core Shell Structure ◽  
Core Shell Nanoparticles

Core-shell nanoparticles Gd2O3:Tb3+/SiOx were obtained by encapsulating Gd2O3:Tb3+ in a polysiloxane shell. We studied the influence of two kinds of reagents (NaOH and Bu4NOH) reacting with precursor solution on size and luminescent property of nanoparticles. The result showed that the reaction involving NaOH was more favorable to the growth of nanoparticles, thus enhanced the energy transfer between the core and the shell of particles and improved their luminescent intensities.

Critical shell thickness and emission enhancement of NaYF4:Yb,Er/NaYF4/silica core/shell/shell nanoparticles

2009 ◽  
Vol 24 (12) ◽  
pp. 3559-3568 ◽  
Author(s):  
Li Peng Qian ◽  
Du Yuan ◽  
Guang Shun Yi ◽  
Gan Moog Chow
Keyword(s):  
Emission Intensity ◽  
Shell Thickness ◽  
Silica Coating ◽  
Inorganic Nanoparticles ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Fluorescent Nanoparticles ◽  
Shell Nanoparticles ◽  
Silica Core ◽  
Core Shell Nanoparticles

Amorphous silica shells, used for functionalization of inorganic nanoparticles in bioapplications, were coated on chemically synthesized NaYF4:Yb,Er upconversion fluorescent nanoparticles via a reverse microemulsion method by using dual surfactants of polyoxyethylene (5) nonylphenylether and 1-hexanol, and tetraethyl orthosilicate as precursor. NaYF4:Yb,Er nanoparticles were equiaxed with a particle size of 11.1 ± 1.3 nm. The thickness of silica shell was ∼8 nm. NaYF4:Yb,Er/silica core/shell nanoparticles were well dispersed in solvents such as ethanol and deionized water. The emission intensities of NaYF4:Yb,Er/silica core/shell nanoparticles remained the same as that of uncoated nanoparticles after surface functionalization with an amine group using (3-aminopropyl)-trimethoxysilan. Silica, although providing a good barrier to the nonradiative relaxation between the upconversion nanoparticles and the environments, did not enhance the emission intensity of upconversion nanoparticles. To increase the emission intensity of NaYF4:Yb,Er/silica core/shell nanoparticles, an undoped NaYF4 shell (∼3-nm thick) was deposited on the upconversion nanoparticles before the silica coating. The total emission intensity of NaYF4:Yb,Er/NaYF4/silica core/shell/shell nanoparticles increased by 15 times compared to that without the intermediate NaYF4 shell. The critical shell thickness of NaYF4 was ∼3 nm, beyond which no further emission intensity enhancement was observed.

Unravelling the energy transfer of Er3+-self-sensitized upconversion in Er3+–Yb3+–Er3+ clustered core@shell nanoparticles

Nanoscale ◽  
2017 ◽  
Vol 9 (46) ◽  
pp. 18490-18497 ◽  
Author(s):  
Bolong Huang ◽  
Mingzi Sun ◽  
Alan William Dougherty ◽  
Hao Dong ◽  
Yue-Jiao Xu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

The interplay on enhancing and quenching effects between Er3+ and Yb3+ dopant clusters in self-sensitized core@shell nanoparticles is studied.

Tunable color emission based on the activator shell thickness of multilayer core–shell nanoparticles under double NIR excitation

CrystEngComm ◽  
2019 ◽  
Vol 21 (28) ◽  
pp. 4175-4183
Author(s):  
Zhaojing Ba ◽  
Yuansuo Zheng ◽  
Min Hu ◽  
Lei Fu ◽  
Yida He ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Transfer Process ◽  
Shell Thickness ◽  
Energy Transfer Process ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Structure ◽  
Core Shell Nanoparticles ◽  
Color Emission

Rare earth luminescent nanomaterials are hot topic due to their unique fluorescence properties. Effective spectral regulation could be achieved by adjusting the coating thickness to affect the energy transfer process in core–shell structure.

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