scholarly journals Hexagonal β-Na(Y,Yb)F4 based core/shell nanorods: epitaxial growth, enhanced and tailored up-conversion emission

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19205-19210 ◽  
Author(s):  
Jing Yan ◽  
Honghu Yao ◽  
Junhao Li ◽  
Shiman He ◽  
Qili Wu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Epitaxial Growth ◽  
Upconversion Emission ◽  
Optically Active ◽  
Rare Earth Ions ◽  
Core Shell ◽  
Growth Method ◽  
One Step

Rare earth ions-doped hexagonal β-Na(Y,Yb)F4 nanorods can be coated perfectly with either optically active or inert shells to improve and/or tailor the upconversion emission through a one-step epitaxial growth method from α-phased nanoparticles.

scholarly journals Rare Earth-Activated Silica-Based Nanocomposites

2007 ◽  
Vol 2007 ◽  
pp. 1-6 ◽  
Author(s):  
C. Armellini ◽  
A. Chiappini ◽  
A. Chiasera ◽  
M. Ferrari ◽  
Y. Jestin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Glass Ceramic ◽  
Spectroscopic Properties ◽  
Rare Earth Ions ◽  
Core Shell ◽  
Silica Spheres ◽  
Photonic Materials ◽  
Seed Growth ◽  
Growth Method

Two different kinds of rare earth-activated glass-based nanocomposite photonic materials, which allow to tailor the spectroscopic properties of rare-earth ions: (i) Er3+-activated SiO2-HfO2waveguide glass ceramic, and (ii) core-shell-like structures of Er3+-activated silica spheres obtained by a seed growth method, are presented.

Upconversion emission of the GaN nanocrystals doped with rare earth ions

2019 ◽  
Vol 94 ◽  
pp. 127-132 ◽  
Author(s):  
K. Lemański ◽  
M. Babij ◽  
P.J. Dereń
Keyword(s):  
Rare Earth ◽  
Upconversion Emission ◽  
Rare Earth Ions

scholarly journals Synthesis of core–shell SAPO-34@SAPO-18 composites by the epitaxial growth method and their catalytic properties for the MTO reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (86) ◽  
pp. 54866-54875 ◽  
Author(s):  
Zhiqiang Xu ◽  
Jianwen Li ◽  
Weixin Qian ◽  
Hongfang Ma ◽  
Haitao Zhang ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
Catalytic Properties ◽  
Composite Catalyst ◽  
Core Shell ◽  
Mto Reaction ◽  
Growth Method

A core/shell-structured SAPO-34@SAPO-18 composite catalyst was hydrothermally synthesized through the epitaxial growth method.

Modified TiO2Structures with Enhanced Photoluminescence and Photocatalytic Activity

2021 ◽  
Vol 13 (2) ◽  
pp. 331-341
Author(s):  
Jinqi Wang ◽  
Guopeng Li ◽  
Wei Wang ◽  
Fuxia Li ◽  
Chuankai Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rare Earth ◽  
Photocatalytic Degradation ◽  
Environmental Remediation ◽  
Rare Earth Ions ◽  
Shell Structures ◽  
Rare Earth Complex ◽  
Core Shell ◽  
Rare Earth Ion ◽  
The Rare Earth

Photocatalytic degradation of pollutants has attracted much attention because it can effectively solve the problem of environmental pollution. SiO2@Eu(TTA)3phen@TiO2 core-shell structures were successfully synthesized for the first time by a solvothermal method involving ultrasound assistance which can optimize the rare earth complex dispersibility and achieve strong emission intensity. SiO2@Eu3+@TiO2 core-shell structures were also successfully synthesized by a similar method. Photocatalytic activity analysis showed that the photocatalytic activity factor not only depended on the rare earth ion content, but also related to the structure and size of the TiO2 nanoparticles. Photocatalytic activity increased first and then decreased with the quantity of rare earth ions. Photocatalytic activity was also superior for hollow structures compared to solid structure. Photocatalytic activity of SiO2@TiO2 particles increased with the particle size, until the size increased to 450 nm. Rare earth ions content as well as particle structures and sizes affected efficiency for the photocatalytic degradation of methyl orange. Outstanding photocatalytic activity provides the composite particles with improved potential to purify aquatic contaminants and to meet the demands of future environmental remediation applications.

Infrared to visible upconversion emission in Nb2O5 modified tellurite glasses triply doped with rare earth ions

2019 ◽  
Vol 6 (8) ◽  
pp. 085203 ◽  
Author(s):  
Gökhan Bilir ◽  
Hüseyin Ertap ◽  
Lidong Ma ◽  
Baldassare Di Bartolo
Keyword(s):  
Rare Earth ◽  
Upconversion Emission ◽  
Rare Earth Ions ◽  
Tellurite Glasses

scholarly journals Electrochemical Epitaxial Growth of TiO2/CdS/PbS Nanocables

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Peng Wang ◽  
Zhongyang Zhang ◽  
Hua Wang ◽  
Tieqiang Zhang ◽  
Haining Cui ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Epitaxial Growth ◽  
Fill Factor ◽  
Lattice Mismatch ◽  
Hierarchical Structures ◽  
Core Shell ◽  
Pbs Nanoparticles ◽  
Growth Method ◽  
Liquid Phase Epitaxial Growth ◽  
Short Current Density

Electrochemical deposition as a liquid phase epitaxial growth method is widely used to fabricate different kinds of hierarchical structures. As a typical heterostructure, TiO2/PbS is widely utilized in the areas of photovoltaics and photocatalysis. Oriented TiO2 nanorod (NR) arrays can provide direct pathways for the electron transport of photoanode. However, the lattice mismatch between TiO2 NR sides and PbS is very large; PbS nanoparticles (NPs) only formed on the top of TiO2 NRs. To solve this problem, TiO2/CdS core/shell nanocables were firstly prepared electrochemically because the lattice ratio between TiO2 and CdS was 0.916; and then, PbS NPs were successfully deposited over CdS shells (the lattice ratio between CdS and PbS was 0.697) to form TiO2/CdS/PbS hierarchical heterostructures. Experimental results demonstrated that the CdS interlayer could effectively promote the growth of PbS NPs on the surface and improve the fill factor and short current density of the photoanodes.

Study on Novel Structure of Glycolic and Oxalic Acid Holmium: [Ho (C3 H6O9)]·CH3OH

2012 ◽  
Vol 531-532 ◽  
pp. 417-420
Author(s):  
Hai Xing Liu ◽  
Wu Lan Zeng ◽  
Jing Zhong Xiao ◽  
Guang Zeng ◽  
Hui Juan Yue ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Hydrothermal Reaction ◽  
Research Work ◽  
Functional Materials ◽  
Structural Diversity ◽  
Upconversion Emission ◽  
Rare Earth Ions ◽  
Rare Earth Doping ◽  
Novel Structure

In the study of functional materials, more attention is the construction of organic–inorganic hybrid materials with structural diversity, fascinating properties, and potential applications in catalysis, molecular adsorption, medicine, electro-conductivity, magnetism and photochemistry. At present, the research work in upconversion emission in rare-earth doping materials has been greatly increased. Yb3+ and Ho3+ upconversion energy transfer is attractive, because Yb3+ and Ho3+ upconversion energy transfer is relatively simple compared to upconversion involving other rare-earth ions. In this paper, a novel holmium complex [Ho (C3 H6O9)] •CH3OH has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Ho atom is coordinated by eight O atoms. The molecular is antisymmetric structure by the C2-C2 axis. The molecular structure stabilized by the O-H…O hydrogen-bonding interactions.

Excitation Pathways of Rare Earth Ions by Energetic Electrons

2008 ◽  
Vol 1111 ◽  
Author(s):  
Samson Penn Tafon ◽  
Zackary Fleischman ◽  
Leon Maurer ◽  
Volkmar Dierolf
Keyword(s):  
Rare Earth ◽  
Strong Dependence ◽  
Optically Active ◽  
Rare Earth Ions ◽  
Beam Irradiation ◽  
Rare Earth Ion ◽  
Electron Hole ◽  
Excitation Efficiency ◽  
Direct Excitation ◽  
Active Can

AbstractUsing cathodoluminescence measurements, we studied the excitation of rare earth ions in LiNbO3 and compare it with previously studied Eu ions in GaN. We find that in both hosts and all dopants the most efficient excitation pathways involves a defect traps that capture the energy from the electron-hole pairs created in the host by E-beam irradiation. Even then the excitation efficiency in LiNbO3 is very low. Moreover, only a small fraction (<10-4) of the RE ions that are optically active can be excited through this pathway. We explain this behavior by a negligible direct excitation and a strong dependence of the excitation efficiency on the distance between the defect trap and the rare earth ion. The density of the defect traps is small such that many rare earth ions are far away from traps.

Er3+-Doped Silicon Prepared by Laser Doping

1993 ◽  
Vol 301 ◽  
Author(s):  
T. Asatsuma ◽  
P. Dodd ◽  
J. F. Donegan ◽  
J. G. Lunney ◽  
J. Hegarty
Keyword(s):  
Rare Earth ◽  
Pulsed Laser ◽  
Earth Metal ◽  
Optically Active ◽  
Rare Earth Ions ◽  
Molten Layer ◽  
Laser Doping ◽  
Doped Silicon ◽  
Preliminary Study ◽  
The Rare Earth

ABSTRACTWe have carried out an investigation of the laser doping of Si with rare-earth ions. In this technique a silicon surface coated with a thin layer of the rare-earth metal is melted with a pulsed laser, the dopant is mixed in the molten layer, and incorporated in the crystal during regrowth. Er was chosen for the main part of our work as it is the best characterized of the rare-earth ions in Si. Luminescence is observed around 1.54µm and is assigned to optical transitions on Er3+ ions. This preliminary study shows that this new technique is viable for the production of optically active Er3+ in Si.

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