scholarly journals Multispectral upconversion luminescence intensity ratios for ascertaining the tissue imaging depth

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 9257-9263 ◽  
Author(s):  
Kai Liu ◽  
Yu Wang ◽  
Xianggui Kong ◽  
Xiaomin Liu ◽  
Youlin Zhang ◽  
...  
Keyword(s):  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Tissue Imaging ◽  
Intensity Ratios ◽  
Imaging Depth

Ascertaining the tissue imaging depth from upconversion emission of nanoparticles.

scholarly journals Gd3+-Doping Effect on Upconversion Emission of NaYF4: Yb3+, Er3+/Tm3+ Microparticles

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3397
Author(s):  
Aleksandra A. Vidyakina ◽  
Ilya E. Kolesnikov ◽  
Nikita A. Bogachev ◽  
Mikhail Y. Skripkin ◽  
Ilya I. Tumkin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrothermal Method ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Size Reduction ◽  
Significant Enhancement ◽  
Partial Substitution ◽  
Luminescence Spectra ◽  
Co Doped

β-NaYF4 microcrystals co-doped with Yb3+, Er3+/Tm3+, and Gd3+ ions were synthesized via a hydrothermal method using rare-earth chlorides as the precursors. The SEM and XRD data show that the doped β-NaYF4 form uniform hexagonal prisms with an approximate size of 600–800 nm. The partial substitution of Y by Gd results in size reduction of microcrystals. Upconversion luminescence spectra of microcrystals upon 980 nm excitation contain characteristic intra-configurational ff bands of Er3+/Tm3+ ions. An addition of Gd3+ ions leads to a significant enhancement of upconversion luminescence intensity with maxima at 5 mol % of dopant.

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.

Tuning the size and upconversion emission of NaYF4:Yb3+/Pr3+ nanoparticles through Yb3+ doping

RSC Advances ◽  
2014 ◽  
Vol 4 (99) ◽  
pp. 56302-56306 ◽  
Author(s):  
Shuwei Hao ◽  
Wei Shao ◽  
Hailong Qiu ◽  
Yunfei Shang ◽  
Rongwei Fan ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Simple Method

We introduce a simple method to tune the resulting size as well as the upconversion luminescence of NaYF4:Yb3+/Pr3+ nanoparticles through varying the sensitizer ytterbium concentration.

MOLTEN SALT SYNTHESIS OF YF3:Yb3+/Ln3+(Ln = Er3+, Tm3+) MICROSHEETS WITH MULTICOLOR UPCONVERSION LUMINESCENCE

2013 ◽  
Vol 06 (06) ◽  
pp. 1350061 ◽  
Author(s):  
MINGYE DING ◽  
CHUNHUA LU ◽  
LINHAI CAO ◽  
YARU NI ◽  
ZHONGZI XU
Keyword(s):  
Molten Salt ◽  
Laser Diode ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Upconversion Emission ◽  
Molten Salt Synthesis ◽  
Molten Salt Method ◽  
Orthorhombic System ◽  
Co Doping ◽  
First Time

In this paper, highly crystalline YF 3: Yb 3+/ Ln 3+( Ln = Er 3+, Tm 3+) microsheets were successfully synthesized by a surfactant-free molten salt method for the first time. The results indicated that the as-obtained samples belonged to orthorhombic system and exhibited microsheets morphology with side lengths of 30 to 80 μm and wall thickness from 1 to 1.5 μm. By changing the dopant's species ( Ln 3+), multicolor (yellow and blue) upconversion emission can be observed in YF 3: Yb 3+/ Ln 3+ microsheets under 980 nm laser diode (LD) excitation. The upconversion mechanisms in co-doping YF 3 samples were analyzed in detail based on the emission spectra. Importantly, this approach not only proposes a new alternative in synthesizing such materials, but also opens the possibility to meet the increasing commercial demand.

scholarly journals Chelating agent and substrate effect on hydrothermal growth of Yb3+/Er3+ doped NaYf4 film

2021 ◽  
Vol 15 (1) ◽  
pp. 69-78
Author(s):  
Suman Duhan ◽  
Kedar Sahoo ◽  
Ahmad Imteyaz ◽  
Sudhir Singh ◽  
Manoj Kumar
Keyword(s):  
Crystal Growth ◽  
Hydrothermal Method ◽  
Luminescence Intensity ◽  
Chelating Agents ◽  
Chelating Agent ◽  
Upconversion Emission ◽  
Substrate Effect ◽  
Current Investigation ◽  
One Step ◽  
Film Roughness

We report simultaneous crystal growth and deposition of upconverting Yb3+/Er3+ doped NaYF4 film (UCF) on conducting and non-conducting substrates by one-step hydrothermal method. The characteristics such as film topography, morphology, crystallographic phase and upconverting luminescence intensity were found to depend both on the chelating agent and nature of the substrate. The characteristics of the prepared films varied interestingly when either the chelating agent or the substrate was changed. The upconversion emission intensities were found to increase with decreasing film roughness. Further, current investigation demonstrated that the NaYF4 films deposited using EDTA or DTPA chelating agents on ITO substrate and EGTA chelating agent on PG substrate were more uniform and resulted in greater upconverted emission intensities. We envision plausible use of current technology in the development of affordable optical platforms for several optoelectronic applications.

Enhanced red upconversion emission and its mechanism in Yb3+–Er3+ codoped α-NaLuF4 nanoparticles

2017 ◽  
Vol 41 (3) ◽  
pp. 1193-1201 ◽  
Author(s):  
Hao Lin ◽  
Dekang Xu ◽  
Anming Li ◽  
Zhiren Qiu ◽  
Shenghong Yang ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Initial Solution ◽  
Solution Ph

Red upconversion luminescence is greatly enhanced through manipulation of the initial solution pH.

Excitation efficiency determines the upconversion luminescence intensity of β-NaYF4:Er3+,Yb3+ nanoparticles in magnetic fields up to 70 T

Nanoscale ◽  
2020 ◽  
Vol 12 (39) ◽  
pp. 20300-20307 ◽  
Author(s):  
Anna Borodziuk ◽  
Michał Baranowski ◽  
Tomasz Wojciechowski ◽  
Roman Minikayev ◽  
Bożena Sikora ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Excitation Efficiency ◽  
The Magnetic Field

We resolve a long standing discrepancy between various reports on the effect of the magnetic field on up-converted luminescence.

Upconversion luminescence, intensity saturation effect, and thermal effect in Gd2O3:Er3,Yb3+ nanowires

2005 ◽  
Vol 123 (17) ◽  
pp. 174710 ◽  
Author(s):  
Yanqiang Lei ◽  
Hongwei Song ◽  
Linmei Yang ◽  
Lixin Yu ◽  
Zhongxin Liu ◽  
...  
Keyword(s):  
Thermal Effect ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Saturation Effect ◽  
Intensity Saturation

Improved Upconversion Luminescence in Water-Soluble Yb3+/Er3+ Codoped LaF3 Nanoparticles Through Ca2+ Doping

2016 ◽  
Vol 16 (4) ◽  
pp. 3883-3885 ◽  
Author(s):  
Shihu Liu ◽  
Peng Zhang ◽  
Daguang Li ◽  
Min Lan ◽  
Zhe Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Environmentally Friendly ◽  
Polyol Process ◽  
Rare Earth Ions ◽  
Water Soluble

Monodisperse water-soluble LaF3: Yb3+/Er3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile, and environmentally-friendly polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs with a small size of 18 nm can be well dispersed in hydrophilic solutions. Meanwhile, their upconversion (UC) luminescence intensity was increased through Ca2+ doping due to the decrease of symmetry around rare earth ions.

Phase-Selective Hydrothermal Preparation and Upconversion Luminescence of NaYF4:Yb3+,Tm3+

2016 ◽  
Vol 690 ◽  
pp. 120-125 ◽  
Author(s):  
Thanataon Pornpatdetaudom ◽  
Karn Serivalsatit
Keyword(s):  
Reaction Time ◽  
Near Infrared ◽  
Hexagonal Phase ◽  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
High Energy ◽  
Lanthanide Ions ◽  
Cubic Phase ◽  
Good Efficiency ◽  
Hydrothermal Temperature

Upconversion luminescence materials have been proved to have a good efficiency on converting low energy light to high energy light. These materials have received considerable attentions for many applications such as bio-labels, sensors, using for developing solar cells and photocatalytic applications under sunlight. Among many inorganic host materials, NaYF4 has been proved to be the best for doping lanthanide ions and have a good upconversion emission due to its low phonon energy, chemical stability, and transparency in the near infrared to ultraviolet range. In this study, NaYF4:Yb3+,Tm3+ upconversion luminescence materials were synthesized by hydrothermal method at temperature of 90 to 200 °C for period between 1 to 24 hours. The synthesized NaYF4:Yb3+,Tm3+ were characterized by X-ray diffraction, scanning electron microscopy, and fluorescence spectroscopy. The hydrothermal temperature and reaction time have strongly influence on phases and upconversion emission of the synthesized NaYF4:Yb3+,Tm3+. At 90 °C for 1 hour of reaction time, the pure cubic phase of NaYF4:Yb3+,Tm3+ was found. After increasing temperature and reaction time, the NaYF4:Yb3+,Tm3+ converted from cubic phase to hexagonal phase. Under excitation of 980 nm diode laser, the hexagonal NaYF4:Yb3+,Tm3+ exhibited the emission wavelength at about 656 nm (3F2 → 3H6), 469, 492, 552 nm (1G4 → 3H6), 537 nm (1D2 → 3H5), 450, 461 nm (1D2 → 3F4), 362 nm (1D2 → 3H6) and 345 nm (1I6 → 3F4). The upconversion emission intensity of the hexagonal NaYF4:Yb3+,Tm3+ was much stronger, compared with that of the cubic NaYF4:Yb3+,Tm3+.

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