Giant enhancement of upconversion emission in NaYF4:Er3+@NaYF4:Yb3+ active-core/active-shell nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22845-22851 ◽  
Author(s):  
Xiangfu Wang ◽  
Tongtong Xu ◽  
Yanyan Bu ◽  
Xiaohong Yan
Keyword(s):  
Upconversion Emission ◽  
Shell Nanoparticles ◽  
Active Core ◽  
Upconversion Emissions ◽  
Core Nanoparticles

An effective method to enhance greatly infrared-visible upconversion emissions of Er3+ ions is demonstrated through coating an optimized active NaYF4:Yb3+ shell around the NaYF4:Er3+ core nanoparticles.

scholarly journals Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb3+ for Efficient Near-Infrared Upconversion Luminescence of Tm3+

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1033
Author(s):  
Jianfeng Li ◽  
Yi Long ◽  
Qichao Zhao ◽  
Shupei Zheng ◽  
Zaijin Fang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Glass Ceramics ◽  
Upconversion Emission ◽  
Ceramic Composites ◽  
Wide Range ◽  
Transmission Window ◽  
Optical Applications ◽  
Upconversion Emissions

Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm3+. The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYb3F10 nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb3+ when the doping concentration varies from 0.5 to 1.5 mol%. Pure near-infrared upconversion emissions are observed and the emission intensities are enhanced in the glass-ceramics as compared to in the precursor glass due to the incorporation of Tm3+ into the KYb3F10 crystal structures via substitutions for Yb3+. Furthermore, KYb2F7 crystals are also nano-crystallized in the glass-ceramics when the Yb3+ concentration exceeds 2.0 mol%. The upconversion emission intensity of Tm3+ is further enhanced by seven times as Tm3+ enters the lattice sites of pure KYb2F7 nanocrystals. The designed glass ceramics provide efficient gain materials for optical applications in the biological transmission window. Moreover, the controllable nano-crystallization strategy induced by Yb3+ opens a new way for engineering a wide range of functional nanomaterials with effective incorporation of Ln3+ ions into fluoride crystal structures.

Enhanced upconversion emission in colloidal (NaYF_4:Er^3+)/NaYF_4  core/shell nanoparticles excited at 1523 nm

2014 ◽  
Vol 39 (6) ◽  
pp. 1386 ◽  
Author(s):  
Wei Shao ◽  
Guanying Chen ◽  
Jossana Damasco ◽  
Xianliang Wang ◽  
Aliaksandr Kachynski ◽  
...  
Keyword(s):  
Upconversion Emission ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Synthesis of Small Ce3+-Er3+-Yb3+ Tri-Doped BaLuF5 Active-Core-Active-Shell-Active-Shell Nanoparticles with Strong Down Conversion Luminescence at 1.5 μm

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 615 ◽  
Author(s):  
Yongling Zhang ◽  
Yudi Shi ◽  
Zhengkun Qin ◽  
Mingxing Song ◽  
Weiping Qin
Keyword(s):  
Communication Systems ◽  
Optical Fiber Communication ◽  
Pump Light ◽  
Layer By Layer ◽  
Shell Nanoparticles ◽  
Fiber Communication ◽  
Active Core ◽  
Surface Quenching ◽  
High Boiling Solvent ◽  
Down Conversion

Small fluoride nanoparticles (NPs) with strong down-conversion (DC) luminescence at 1.5 μm are quite desirable for optical fiber communication systems. Nevertheless, a problem exists regarding how to synthesize small fluoride NPs with strong DC emission at 1.5 μm. Herein, we propose an approach to improve 1.5 μm emission of BaLuF5:Yb3+,Er3+ NPs by way of combining doping Ce3+ ions and coating multiple BaLuF5: Yb3+ active-shells. We prepared the BaLuF5:18%Yb3+,2%Er3+,2%Ce3+ NPs through a high-boiling solvent method. The effect of Ce3+ concentration on the DC luminescence was systematically investigated in the BaLuF5:Yb3+,Er3+ NPs. Under a 980 nm laser excitation, the intensities of 1.53 μm emission of BaLuF5:18%Yb3+,2%Er3+,2%Ce3+ NPs was enhanced by 2.6 times comparing to that of BaLuF5:18%Yb3+,2%Er3+ NPs since the energy transfer between Er3+ and Ce3+ ions: Er3+:4I11/2 (Er3+) + 2F5/2 (Ce3+) → 4I13/2 (Er3+) + 2F7/2 (Ce3+). Then, we synthesized BaLuF5:18%Yb3+,2%Er3+,2%Ce3+@BaLuF5:5%Yb3+@BaLuF5:5%Yb3+ core-active-shell-active-shell NPs via a layer-by-layer strategy. After coating two BaLuF5:Yb3+ active-shell around BaLuF5:Yb3+,Er3+,Ce3+ NPs, the intensities of the 1.53 μm emission was enhanced by 44 times compared to that of BaLuF5:Yb3+,Er3+ core NPs, since the active-shells could be used to not only suppress surface quenching but also to transfer the pump light to the core region efficiently through Yb3+ ions inside the active-shells.

scholarly journals Dynamic magnetic characterization and magnetic particle imaging enhancement of magnetic-gold core–shell nanoparticles

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 6489-6496 ◽  
Author(s):  
Asahi Tomitaka ◽  
Satoshi Ota ◽  
Kizuku Nishimoto ◽  
Hamed Arami ◽  
Yasushi Takemura ◽  
...  
Keyword(s):  
Magnetic Particle ◽  
Magnetic Core ◽  
Gold Coating ◽  
Shell Nanoparticles ◽  
Gold Core ◽  
Magnetic Particle Imaging ◽  
Particle Imaging ◽  
Core Shell Nanoparticles ◽  
Imaging Performance ◽  
Core Nanoparticles

The gold coating on magnetic core nanoparticles enhanced magnetic particle imaging performance due to an alteration in dynamic magnetic responses.

scholarly journals Enhanced Upconversion Luminescence in Yb3+/Tm3+-Codoped Fluoride Active Core/Active Shell/Inert Shell Nanoparticles through Directed Energy Migration

Nanomaterials ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 55-68 ◽  
Author(s):  
Hailong Qiu ◽  
Chunhui Yang ◽  
Wei Shao ◽  
Jossana Damasco ◽  
Xianliang Wang ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Energy Migration ◽  
Shell Nanoparticles ◽  
Active Core ◽  
Directed Energy

Exploiting the silent upconversion emissions from a single β-NaYF4:Yb/Er microcrystal via saturated excitation

2018 ◽  
Vol 6 (38) ◽  
pp. 10226-10232 ◽  
Author(s):  
M. Yuan ◽  
R. Wang ◽  
C. Zhang ◽  
Z. Yang ◽  
W. Cui ◽  
...  
Keyword(s):  
Upconversion Emission ◽  
Upconversion Emissions

Achieving intense nearly white upconversion emission from a single β-NaYF4:Yb/Er microcrystal via saturated excitation.

UPCONVERSION LUMINESCENCE ENHANCEMENT OF NaYF4:Yb3+, Er3+ NANOPARTICLES ON INVERSE OPAL SURFACE

2014 ◽  
Vol 21 (01) ◽  
pp. 1450017 ◽  
Author(s):  
JIAYAN LIAO ◽  
ZHENGWEN YANG ◽  
HANGJUN WU ◽  
SHENFENG LAI ◽  
JIANBEI QIU ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Band Gaps ◽  
Inverse Opal ◽  
Photonic Band Gaps ◽  
Selective Reflection ◽  
Inverse Opals ◽  
Upconversion Emissions ◽  
Photonic Band ◽  
Co Doped

LaPO 4 inverse opal photonic crystals with different photonic band gaps were fabricated by template-assisted method. The Yb 3+/ Er 3+ co-doped NaYF 4 nanoparticles were deposited on the surfaces of the inverse opals, and their up-conversion emission properties were investigated. The upconversion emissions of Yb 3+/ Er 3+ co-doped NaYF 4 nanoparticles on the inverse opal surfaces have been enhanced when the upconversion emission bands of the nanoparticles are in the range of photonic band gaps of the inverse opals, which is attributed to an efficient and selective reflection of photonic band gaps.

scholarly journals Hydrothermal Synthesis and Tunable Multicolor Upconversion Emission of Cubic Phase Y2O3Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Haibo Wang ◽  
Chao Qian ◽  
Zhigao Yi ◽  
Ling Rao ◽  
Hongrong Liu ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Light Yellow ◽  
Color Displays ◽  
Transmission Electron ◽  
Subsequent Calcination ◽  
Upconversion Emissions

Highly crystalline body-centered cubic structure Y2O3with lanthanide (Ln) codopants (Ln = Yb3+/Er3+and Yb3+/Ho3+) has been synthesized via a moderate hydrothermal method in combination with a subsequent calcination. The structure and morphology of Y(OH)3precursors and Y2O3nanoparticles were characterized by X-ray diffraction and transmission electron microscopy. The results reveal that the Y2O3nanoparticles possess cubic phase and form the quasispherical structure. The upconversion luminescence properties of Y2O3nanoparticles doped with different Ln3+(Yb3+/ Er3+and Yb3+/ Ho3+) ions were well investigated under the 980 nm excitation. The results show that the Yb3+/Er3+and Yb3+/Ho3+codoped Y2O3nanoparticles exhibit strong red and light yellow upconversion emissions, respectively. It is expected that these Y2O3nanoparticles with tunable multicolor output and intense red upconversion emission may have potential application in color displays and biolabels.

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