Nanowerk News ) A team of researchers led by Professors Hong Zhang (photonic nanochemistry) and Evert Jan Meijer (computational chemistry) of the University of Amsterdam's Van 't Hoff Institute for Molecular Sciences has significantly improved the fundamental understanding of photon upconversion in nanoparticles. (nanowerk.com)
While infrared upconversion imaging using halide nanoparticles is very common, the search for very efficient halide free upconverting phosphors is still lacking. (uky.edu)
Reliance on low tissue penetrating UV or visible light limits clinical applicability of phototherapy, necessitating use of deep tissue penetrating near-infrared (NIR) to visible light transducers like upconversion nanoparticles (UCNPs). (nature.com)
It is important to note that realizing efficient upconversion luminescence typically requires the homogeneous placement of sensitizer and activator ions in rather close proximity, as is the case for NaYF 4 nanoparticles co-doped with Yb 3+ and Er 3+ (ref. 4 ). (nature.com)
Here, the multicolor upconversion luminescence properties of the hybrid materials composed of CsPbX3(X = Br/I) perovskite quantum dots and upconversion nanoparticles (UCNPs, core-shell NaYF425%Yb3+,0.5%Tm3+@NaYF4) is reported, achieving the upconversion luminescence with stable and bright of CsPbX3 perovskite quantum dots under 980 nm excitation. (bvsalud.org)
The researchers designed the nanoparticles from two components: An "upconversion" core that glows blue when struck by near-infrared light, and an outer fabric of porphyrin-phospholipids (PoP) that wraps around the core. (futurity.org)
FAYETTEVILLE, GA, USA, September 19, 2023/ EINPresswire.com / -- Lanthanide-doped upconversion nanoparticles emerged recently as an attractive material platform for light emission. (woodtv.com)
Lanthanide-doped upconversion nanoparticles (UCNPs) demonstrate many superior properties of broadly-tunable multicolour emission and long emission lifetimes. (woodtv.com)
Upconversion nanoparticles (UCNPs) exhibit unique optical properties such as photo-emission stability, large anti-Stokes shift, and long excited-state lifetimes, allowing significant advances in a broad range of applications from biomedical sensing to super-resolution microscopy. (edu.au)
Detection of Amyloid Oligomers by a Fluorescence Ratio Strategy Based on Optically Trapped Highly Doped Upconversion Nanoparticles-SiO2@Metal COrganic Framework Microspheres. (sapphiretoast.com)
Breaking Through Bead-Supported Assay: Integration of Optical Tweezers Assisted Fluorescence Imaging and Luminescence Confined Upconversion Nanoparticles Triggered Luminescent Resonance Energy Transfer (LRET). (sapphiretoast.com)
Photon upconversion5
Lanthanide-based nanocrystals possess three unique physical properties that make them attractive for facilitating photoreactions, namely photon upconversion luminescence, Lewis acid catalytic activity and photothermal properties. (ntu.edu.sg)
By constructing a multiphoton upconversion system for Ho3+, we regulate the degree of polarization (DOP) of PUCL from 0.6 for two-photon luminescence to 0.929 for three-photon upconversion luminescence (UCL). (opticaopen.org)
These findings provide a general method to stimulate photon upconversion and improve the stability of perovskite nanocrystals , which will be better applied in the field of anti-counterfeiting. (bvsalud.org)
It offers an effective approach for enhancing polarized photon upconversion processes paving the way towards efficient low-threshold polarization upconversion lasers. (woodtv.com)
Recent progress in the development of gels showing triplet-triplet annihilation based photon upconversion (TTA-UC) is reviewed. (mdpi.com)
Ions10
In a recent publication in Angewandte Chemie ( 'Precisely Tailoring Upconversion Dynamics via Energy Migration in Core-Shell Nanostructures' ) the researchers describe how 'dopant ions spatially separated' (DISS) nanostructures can be used for tailoring the upconversion dynamics. (nanowerk.com)
The upconversion process in the 'dopant ions spatial separated' nanostructure. (nanowerk.com)
Typically upconversion materials are doped with lanthanide ions. (nanowerk.com)
Upconversion luminescence dynamics has long been believed to be determined solely by the emitting ions and their interactions with neighbouring sensitizing ions. (nanowerk.com)
In this Article, large enhancement in upconversion (UC) luminescence was verified in a transparent aluminosilicate glass-ceramics (GCs) containing CaF 2 nanocrystals (NCs) codoped with Er 3+ and Yb 3+ ions. (researcher-app.com)
Polarized upconversion luminescence (PUCL) of lanthanide (Ln3+) ions has been widely used in single particle tracking, microfluidics detection, three-dimensional displays, and so on. (opticaopen.org)
Zinc-borosilicate glass containing Nd3+ ions has been prepared to study the NIR fluorescence and the violet upconversion emission properties. (csircentral.net)
Mechanisms involved in these upconversion emissions are shown to either involve excited state absorption or energy transfer depending upon the concentration of the rare earth ions. (epjap.org)
In recent years, progress on nanoparticle synthesis led to the development of many strategies for enhancing their upconversion luminescence, focused in particular on heavy doping of lanthanide ions and core-shell structures. (edu.au)
It was pointed out that the absorptions of pumping light and emitting light, phonon energies of host materials, the choices of doping ions and pumping routes must be considered in the designs of up-conversion luminescence materials. (chineseoptics.net.cn)
Fluorescence1
Metallic structures supporting surface plasmons effectively localise light and create strong electric fields, enhancing upconversion fluorescence. (woodtv.com)
Nanocrystals5
Zhang, Meijer and co-workers demonstrate that in nanocrystals the luminescence time behaviour is seriously affected by the migration process of the excitation energy. (nanowerk.com)
By combining the process of cation exchange with energy migration, the luminescence properties of the nanocrystals can be easily tuned while preserving the size, morphology and crystal phase of the initial nanocrystal template. (nature.com)
This post-synthesis strategy enables us to achieve upconversion luminescence in Ce 3+ and Mn 2+ -activated hexagonal-phased nanocrystals, opening a gateway towards applications ranging from chemical sensing to anti-counterfeiting. (nature.com)
These reactions present an alternative solution for modulating emission colours in upconversion nanocrystals. (nature.com)
Here we reason that utilization of a Gd 3+ -based host lattice may leverage multicolour synthesis in upconversion nanocrystals through cation exchange under mild conditions. (nature.com)
UCNPs4
Multi-color UCNPs/CsPb(Br 1-x I x ) 3 for upconversion luminescence and dual-modal anticounterfeiting. (bvsalud.org)
Compared with the nonlinear upconversion of multi-photon absorption in perovskite, UCNPs/CsPbX3 achieves lower power density excitation by using the UCNPs as the physical energy transfer level, meeting the demand for multi- color upconversion luminescence in optical applications. (bvsalud.org)
The inherent upconversion emission processes associated with the 4f electronic transition in UCNPs are typically weak and do not exhibit polarization characteristics. (woodtv.com)
Most previous studies focused on enhancing the upconversion luminescence by coupling UCNPs with plasmonic nanostructures. (woodtv.com)
Phosphor3
Under 980 nm diode laser excitation, efficient upconversion emissions from the Ho 3+ /Yb 3+ codoped CaWO 4 phosphor were obtained. (psu.edu)
abstract = "Under 980 nm diode laser excitation, efficient upconversion emissions from the Ho3+/Yb3+ codoped CaWO4 phosphor were obtained. (psu.edu)
Multimodal bioimaging using a rare earth doped Gd2O2S:Yb/Er phosphor with upconversion luminescence and magnetic resonance properties. (chicagobiomedicalconsortium.org)
Spectroscopy3
Through the collaborative approach of advanced spectroscopy and theoretical modelling they were able to establish that the migration of excitation energy greatly affects the upconversion dynamics. (nanowerk.com)
The researchers unravelled the intimate link between the random nature of the energy migration and the upconversion luminescence time behaviour by means of a complementary approach of advanced spectroscopy and time-resolved Monte Carlo simulation. (nanowerk.com)
FluoMic add-on provides a fast, easy, and reliable way to carry out steady-state and time-resolved luminescence spectroscopy with a micrometer sized, positionable observation volume. (picoquant.com)
Emission2
Persistent luminescence, commonly called afterglow, is long-lasting visible emission over several hours after ultraviolet excitation. (edinst.com)
In this application note, we discuss how the use of luminescence thermometry changes the emissive properties of upconversion materials. (edinst.com)
Rare earth doped3
Introduction to up-conversion luminescence of rare earth doped materials[J]. Chinese Optics, 2010, 3(4): 301-309. (chineseoptics.net.cn)
Up-conversion luminescence in rare earth doped materials is an important approach for the optical frequency conversion as well an important aspect in the researches of luminescent materials. (chineseoptics.net.cn)
On the basis of the introduction of fundamental concepts of the up-conversion luminescence, the research history of up-conversion luminescence of rare earth doped materials was briefly reviewed and the up-conversion mechanisms including energy transfer, excited state absorption, co-operative sensitization, co-operative luminescence, two-photon absorbed excitation and photon avalanche processes in rare earth doped materials were summarized and compared with each others. (chineseoptics.net.cn)
Emissions1
In a new paper published in eLight , a team of scientists led by Professors Xiangping Li and Zi-Lan Deng (Jinan University), Junjie Li (Institute of Physics, CAS), Yuri Kivshar (Australian National University) have developed a dielectric metasurface for the amplification of upconversion emissions. (woodtv.com)
Absorption2
Upconversion is a process in which one photon is emitted upon absorption of several photons of lower energy. (nanowerk.com)
The concentrated electromagnetic field near these nanostructures can significantly boost the absorption cross-sections and the upconversion radiation rates. (woodtv.com)
Photoluminescence1
An effective strategy for achieving ultrabright and dual-band polarized upconversion photoluminescence is presented. (woodtv.com)
NaYF41
Here, we report a strategy to regulate PUCL in Ho3+-doped NaYF4 single nanorods based on the number of upconversion photons. (opticaopen.org)
Spectra2
Herein, a simple method for time-gated upconversion luminescence spectra measurement and biological imaging was developed. (aston.ac.uk)
By equipping with a 980 nm CW laser as exciting source, the time-gated spectra of upconversion lanthanide luminescence free from the scattering light was measured. (aston.ac.uk)
The PoP layer also is adept at attracting copper, which is used in PET and Cerenkov luminescence imaging. (futurity.org)
Quantum1
The upconversion quantum efficiency was evaluated to be about 3.3% when the power density of the excitation laser was 47 W/cm 2 . (psu.edu)
Phosphors2
In this article we report Gd 2 O 2 S:Yb/Er, YbHo, YbTm systems as very efficient alternative phosphors that show upconversion efficiency comparable to or even higher than those of existing halide phosphors. (uky.edu)
Then, the up-conversion luminescence mechanisms for various rare earths doped materials were summarized and the host materials such as phosphors, crystal and non-crystalline solids for rare earth were introduced. (chineseoptics.net.cn)
Photons1
Upconversion (UC) luminescence is a process that converts low-energy photons into higher-energy ones with promising applications in diverse fields. (phys.org)
Properties2
Many upconversion luminescent materials emissive properties change as a function of temperature, pressure, or the presence of a chemical species. (edinst.com)
Such properties have long been exploited in the development of luminescence-based sensors. (edinst.com)
Decay1
Based on this new fundamental insight, the researchers were able to successfully control the upconversion luminescence time behaviour (either the rise or decay process) by tuning the energy migration paths in various specifically designed DISS nanostructures. (nanowerk.com)
Optical3
Multiple miRNA Detection through a Suspended Microbead Array Encoded by Triple-Color Upconversion Luminescent Nanotags Via Bi-Beam Splitter Hybrid-Multitrap Optical Tweezers. (sapphiretoast.com)
Holographic Optical Tweezers and Boosting Upconversion Luminescent Resonance Energy Transfer Combined Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/Cas12a Biosensors. (sapphiretoast.com)
Combining Holographic Optical Tweezers with Upconversion Luminescence Encoding: Imaging-Based Stable Suspension Array for Sensitive Responding of Dual Cancer Biomarkers. (sapphiretoast.com)
Manipulating1
Real-time Monitoring of Temperature Variations around a Gold Nanobipyramid Targeted Cancer Cell under Photothermal Heating by Actively Manipulating an Optically Trapped Luminescent Upconversion Microparticle. (sapphiretoast.com)
Imaging1
Moreover, smart phones or the human eyes could easily detect the delayed luminescence of these materials, promising the true-color biological imaging with common cameras. (aston.ac.uk)
Concentration1
Because of its large energy gap ( ∼ 4.0 eV) between the ground state ( 8 S 7/2 ) and the lowest excited state ( 6 P 7/2 ), the Gd 3+ ion also serves as an ideal energy reservoir to suppress the concentration quenching of sensitized luminescence in crystalline nanophosphors. (nature.com)
Detection2
This approach could be used in many other time-gated luminescence detection for long-lived luminescence materials and probes excited by other light sources. (aston.ac.uk)
Combining Upconversion Luminescence, Photothermy and Electrochemistry for Highly Accurate Triple-Signal Detection of Hydrogen Sulphide by Optically Trapping Single Microbeads. (sapphiretoast.com)
Strategy1
And this regulation strategy of PUCL has also been achieved in Tm3+, where DOP is ranged from 0.233 for two-photon luminescence to 0.925 for four-photon UCL. (opticaopen.org)
Bands1
Resonant dielectric metasurfaces support high-quality polarization-selective resonant modes at dual upconversion bands. (woodtv.com)