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.

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).

“A bridge over troubled gaps”: up-conversion driven photocatalysis for hydrogen generation and pollutant degradation by near-infrared excitation

2018 ◽  
Vol 54 (15) ◽  
pp. 1905-1908 ◽  
Author(s):  
P. Acosta-Mora ◽  
K. Domen ◽  
T. Hisatomi ◽  
H. Lyu ◽  
J. Méndez-Ramos ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Near Infrared ◽  
Hydrogen Generation ◽  
Organic Dyes ◽  
Pollutant Degradation ◽  
Present Evidence ◽  
Photon Conversion ◽  
Infrared Excitation

We present evidence of NIR-to-UV-VIS photon conversion for degradation of organic dyes and hydrogen and oxygen evolution.

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 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

Multifunctional Y203:Yb3+/Tm3+/Li+ Nanocrystals with Enhanced Near-Infrared to Near-Infrared Upconversion Photoluminescence

2011 ◽  
Vol 197-198 ◽  
pp. 168-173
Author(s):  
Dong Yu Li ◽  
Jun Li ◽  
Yu Xiao Wang ◽  
Yang Kun ◽  
Xue Ru Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Light Scattering ◽  
Optical Imaging ◽  
Near Infrared ◽  
Biological Imaging ◽  
High Contrast ◽  
Light Penetration ◽  
Rare Earth Ion ◽  
Biological Specimen ◽  
Pl Intensity

Rare earth ion-doped Y2O3nanoparticles are attractive for biological imaging applications due to their non-toxicity, resistance to photobleaching, and possibility for upconversion. Y2O3:Yb3+/Tm3+nanocrystals display photoluminescence (PL) with a peak at ~811nm if excited at ~980nm. This Near-Infrared to Near-Infrared (NIR-to-NIR) upconversion (UC) process provides deeper light penetration into biological specimen and results in high contrast optical imaging due to absence of an autofluorescence background and decreased light scattering. Here, we report that NIR-to-NIR UC PL intensity of Y2O3:Yb3+/Tm3+nanocrystals are enhanced by doping with different Tm3+ions and Li+ions concentration. When the Tm3+ions concentration reaches 0.25 mol%, the NIR-to-NIR UC PL intensity is the strongest. And the NIR-to-NIR UC PL intensity of Y2O3:5 mol % Yb3+ions, 0.25mol% Tm3+ions and 5mol% Li+ions is maximum, which is more that about 14 times than that of no doped Li+ions. This material may show promise for use as probes for biological imaging.

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.

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.

Activatable Rare Earth Near-Infrared-II Fluorescence Ratiometric Nanoprobes

Nano Letters ◽  
2021 ◽  
Author(s):  
Ziqiang Sun ◽  
Haoying Huang ◽  
Rong Zhang ◽  
Xiaohu Yang ◽  
Hongchao Yang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Near Infrared
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