scholarly journals Upconversion luminescence in sub-10 nm β-NaGdF4:Yb3+,Er3+ nanoparticles: an improved synthesis in anhydrous ionic liquids

RSC Advances ◽  
2019 ◽  
Vol 9 (60) ◽  
pp. 34784-34792
Author(s):  
Gabriella Tessitore ◽  
Anja-Verena Mudring ◽  
Karl W. Krämer
Keyword(s):  
Ionic Liquids ◽  
Shell Structure ◽  
Emission Intensity ◽  
Bulk Material ◽  
Upconversion Luminescence ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
Microwave Assisted ◽  
Core Shell Structure ◽  
Nanoparticle Emission

The microwave-assisted synthesis of β-NaGdF4:Er3+,Yb3+ in anhydrous ionic liquids yields efficient upconversion luminescence nanoparticles. A core–shell structure raises the nanoparticle emission intensity to 0.12% of the bulk material.

A microwave-assisted synthesis of CoO@Co core–shell structures coupled with N-doped reduced graphene oxide used as a superior multi-functional electrocatalyst for hydrogen evolution, oxygen reduction and oxygen evolution reactions

2017 ◽  
Vol 5 (12) ◽  
pp. 5865-5872 ◽  
Author(s):  
X. X. Liu ◽  
J. B. Zang ◽  
L. Chen ◽  
L. B. Chen ◽  
X. Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Shell Structure ◽  
Shell Structures ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
Microwave Assisted ◽  
Reduced Graphene ◽  
Core Shell Structure

CoO@Co with a core–shell structure coupled with N-rGO used as a superior multifunctional electrocatalyst was obtained using a convenient and controllable technique.

Enhancing Upconversion Luminescence of LiYF4:Yb,Er Nanocrystals by Cd2+ Doping and Core–Shell Structure

2017 ◽  
Vol 121 (34) ◽  
pp. 18909-18916 ◽  
Author(s):  
Yiru Zhu ◽  
Shuwen Zhao ◽  
Bin Zhou ◽  
Hao Zhu ◽  
Youfa Wang
Keyword(s):  
Shell Structure ◽  
Upconversion Luminescence ◽  
Core Shell ◽  
Core Shell Structure

Multifunctional porous organic polymers embedded with magnetic nanoparticles

2017 ◽  
Vol 5 (6) ◽  
pp. 2981-2986 ◽  
Author(s):  
Shanlin Qiao ◽  
Wei Huang ◽  
Ting Wang ◽  
Bin Du ◽  
Xiangning Chen ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Shell Structure ◽  
Bulk Material ◽  
Core Shell ◽  
Organic Polymers ◽  
Porous Organic Polymers ◽  
Core Shell Structure

Magnetism, a conjugated π-system and ultramicropores are combined in one multifunctional bulk material with a core@shell structure for dynamic and static pollutant treatment.

scholarly journals Efficient Color Tuning of Upconversion Luminescence from Core-Shell Oxysulfide Nanoparticles

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Ying Tian ◽  
Jianxin Jiao ◽  
Xin Feng ◽  
Mingming Xing ◽  
Yong Peng ◽  
...  
Keyword(s):  
Shell Structure ◽  
Upconversion Luminescence ◽  
Cross Relaxation ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Luminescence Efficiency ◽  
Core Shell Structure ◽  
Core Shell Nanoparticles ◽  
Triple Ion

The Y2O2S:Er3+@Y2O2S:Yb3+,Ho3+ core-shell up-conversion (UC) nanoparticles were successfully synthesized by the homogeneous co-precipitation method. The Y2O2S:Er3+@Y2O2S:Yb3+,Ho3+ core-shell nanoparticles exhibit bright green emissions under 980 nm excitation, while the triple-ion doped Y2O2S:Er3+,Yb3+,Ho3+ sample presents mainly red emissions. The intensity ratio of green-to-red emission of the core-shell and conventional triple-ion doped samples are 2.8 and 0.3, respectively. Investigations on the UC mechanisms show that emissions from Er3+ and Ho3+ ions are achieved simultaneously in the core-shell nanoparticles. This is due to the efficient energy transfers of Yb3+→Ho3+ within the shell layer and Yb3+→Er3+ between the shell and the core. While the triple-ion doped Y2O2S: Er3+,Yb3+,Ho3+ sample exhibits mainly the emissions of Er3+ along with weak luminescence of Ho3+ ion. Since the cross relaxation between Er3+ and Ho3+ ions in the Y2O2S:Er3+,Yb3+,Ho3+ nanoparticles can effectively suppress the emissions of Ho3+ ions. Yet, in the core-shell structure, this cross relaxation can be successfully restrained in the core-shell structure where Er3+ is in the core and Ho3+ is in the shell. Therefore, the construction of core-shell structure can improve the luminescence efficiency and provide a route for adjustment of emission color.

scholarly journals Homo–hetero/core–shell structure design strategy of NaYF4 nanocrystals for superior upconversion luminescence

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 20746-20751
Author(s):  
Raheel Ahmed Janjua ◽  
Obaid Iqbal ◽  
Muhammad Aqeel Ahmed ◽  
Abdullah A. Al-Kahtani ◽  
Sara Saeed ◽  
...  
Keyword(s):  
Shell Structure ◽  
Upconversion Luminescence ◽  
Design Strategy ◽  
Structure Design ◽  
Shell Structures ◽  
Core Shell ◽  
Core Shell Structure

Establishment of essential conditions of different phases of NaYF4 and their utilization for the synthesis of core/shell structures to achieve the enhancement of UCL intensities.

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