Controlled size and morphology, and phase transition of YF3:Yb3+,Er3+ and YOF:Yb3+,Er3+ nanocrystals for fine color tuning

2016 ◽  
Vol 4 (2) ◽  
pp. 331-339 ◽  
Author(s):  
Yongsheng Zhu ◽  
Wen Xu ◽  
Shaobo Cui ◽  
Mao Liu ◽  
Cheng Lu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Rare Earth ◽  
Near Infrared ◽  
Visible Emission ◽  
Color Tuning ◽  
Wide Range ◽  
Upconversion Nanocrystals ◽  
Infrared Excitation ◽  
Size And Morphology

Rare-earth (RE) based fluoride and oxyfluoride upconversion nanocrystals (UCNCs) have the ability to generate multicolor visible emission as well as a wide range of applications under near-infrared excitation.

Photosensitizer coated upconversion nanoparticles for triggering reactive oxygen species under 980 nm near-infrared excitation

2019 ◽  
Vol 7 (46) ◽  
pp. 7306-7313 ◽  
Author(s):  
Jinhua Wu ◽  
Shanshan Du ◽  
Yuhua Wang
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Rare Earth ◽  
Near Infrared ◽  
Reactive Oxygen ◽  
Great Promise ◽  
Upconversion Nanoparticles ◽  
Oxygen Species ◽  
Infrared Excitation

Rare-earth-based upconversion nanotechnology has recently shown great promise for photodynamic therapy (PDT).

Efficient Upconverting Nanophosphors for Imaging and Photodynamic Therapy

2012 ◽  
Vol 1471 ◽  
Author(s):  
Brian G. Yust ◽  
Gangadharan Ajith Kumar ◽  
Lawrence C. Mimun ◽  
Dhiraj K. Sardar
Keyword(s):  
Photodynamic Therapy ◽  
Rare Earth ◽  
Biomedical Applications ◽  
Near Infrared ◽  
High Efficiency ◽  
Synthesis Method ◽  
Spectroscopic Properties ◽  
Sodium Potassium ◽  
Infrared Excitation ◽  
Upconverting Nanophosphors

ABSTRACTErbium-Ytterbium codoped nanophosphor systems are explored for high efficiency upconversion. The NIR to visible upconversion from 1550 nm and 980 nm excitation are of particular interest to us for biomedical applications such as imaging, sensing, and photodynamic therapy. Variations in synthesis method and rare earth concentration are carried out in sodium, potassium, and transition metal based phosphor materials. The spectroscopic properties of the material dry and in biologically appropriate solution are taken. After bioconjugation, these particles will be used in a mouse model to demonstrate that cancer imaging with a near-infrared excitation source is possible.

scholarly journals Near infrared excitation and emission in rare earth MOFs via encapsulation of organic dyes

2018 ◽  
Vol 9 (42) ◽  
pp. 8099-8102 ◽  
Author(s):  
Chong Liu ◽  
Svetlana V. Eliseeva ◽  
Tian-Yi Luo ◽  
Patrick F. Muldoon ◽  
Stéphane Petoud ◽  
...  
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Organic Dyes ◽  
Biological Imaging ◽  
Diagnostic Window ◽  
Infrared Excitation

Dye RE3+-MOF hybrid exhibits both NIR excitation and emission within the biological diagnostic window, highlighting its potential for biological imaging.

scholarly journals Submicron-sized phosphors based on hexagonal rare earth oxycarbonate for near-infrared excitation and emission

2019 ◽  
Vol 7 (4) ◽  
pp. 502-508
Author(s):  
Mizuki Watanabe ◽  
Yasuhiro Sejima ◽  
Ryohei Oka ◽  
Shintaro Ida ◽  
Toshiyuki Masui
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Infrared Excitation

Peculiarities of Elastic Properties of RE Cobaltites RBaCo4O7 (R = Dy - Er, Y) at Magnetic Phase Transitions

2015 ◽  
Vol 233-234 ◽  
pp. 145-148 ◽  
Author(s):  
Zoya Kazei ◽  
Vyacheslav Snegirev ◽  
Alexander Andreenko ◽  
Ludmila Kozeeva ◽  
Margarita Kameneva
Keyword(s):  
Phase Transition ◽  
Rare Earth ◽  
Young’S Modulus ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Young's Modulus ◽  
Exchange Interactions ◽  
Magnetic Phase Transitions ◽  
Wide Range ◽  
Irreversible Effects

It has been found that the temperature dependences of the Young’s modulus for rare-earth cobaltites RBaCo4O7 (R = Dy - Er, Y) exhibit significant hysteresis and irreversible effects over a wide range (80–280) K between the structural and magnetic phase transition temperatures. At the magnetic phase transition temperature, there are weak and smoothed anomalies of the Young’s modulus, which correlate with the low dimensionality and frustration of the exchange interactions in the Kagome lattice of the Co subsystem for the studied rare-earth cobaltites.

Upconversion nanoparticle arrays for detecting glycated hemoglobin with high sensitivity and good reusability

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102226-102230 ◽  
Author(s):  
Pan Hu ◽  
Xiaofeng Wu ◽  
Shigang Hu ◽  
Zhijun Tang ◽  
Gangtao Dai ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Glycated Hemoglobin ◽  
High Sensitivity ◽  
Visible Emission ◽  
Upconversion Nanoparticles ◽  
Nanoparticle Arrays ◽  
Infrared Excitation

Lanthanide-doped upconversion nanoparticles (UCNPs) have attracted extensive interest in bio-applications due to their unique optical properties by converting near infrared excitation to visible emission.

scholarly journals Correction: Controlled size and morphology, and phase transition of YF3:Yb3+,Er3+ and YOF:Yb3+,Er3+ nanocrystals for fine color tuning

2016 ◽  
Vol 4 (3) ◽  
pp. 638-638 ◽  
Author(s):  
Yongsheng Zhu ◽  
Wen Xu ◽  
Shaobo Cui ◽  
Mao Liu ◽  
Cheng Lu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Color Tuning ◽  
Size And Morphology

Correction for ‘Controlled size and morphology, and phase transition of YF3:Yb3+,Er3+ and YOF:Yb3+,Er3+ nanocrystals for fine color tuning’ by Yongsheng Zhu et al., J. Mater. Chem. C, 2016, DOI: 10.1039/c5tc03473f.

EXPRESS: Upconversion Fluorescence in Naturally Occurring Calcium Fluoride

2020 ◽  
pp. 000370282097905
Author(s):  
Jillian Elizabeth Moffatt ◽  
Thomas Bede Payten ◽  
Georgios Tsiminis ◽  
Thomas Jacob de Prinse ◽  
Lewis da Silva Teixeira ◽  
...  
Keyword(s):  
Rare Earth ◽  
Real Time ◽  
Near Infrared ◽  
Complex Environments ◽  
Mineral Concentration ◽  
Fluorescence Studies ◽  
Upconversion Fluorescence ◽  
Naturally Occurring ◽  
Infrared Excitation ◽  
Mine Sites

Fluorine can negatively interfere with leach and smelting processes during mineral processing1,2. Real-time knowledge of the concentration and mineral hosts of fluorine in a mineral processing ore stream is important to protect process line equipment and product. Currently only offline methods of detection are available. Online sensors that determine specific fluorine-bearing mineral concentration in real-time would enable improved efficiency in processing decisions during mine production. Common excitation wavelengths used for fluorescence studies in minerals frequently provide signals that are not clearly host-specific, and hence of limited utility for mineral identification. We show that upconversion fluorescence (UF), a process in which two or more photons are absorbed and one higher-energy photon is emitted, provides a more host-specific fluorescence output, minimising spurious signals in complex environments and therefore greatly improving detection thresholds. Natural samples of fluorite (CaF2), a major fluorine host at many mine sites, have been analysed by near-infrared excitation and have revealed UF from rare earth inclusions. UF was detected in samples with rare earth concentrations as low as 1 part per million, and is therefore considered a potential new sensing modality for real-time fluorite monitoring.

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