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88 results for “Luminescence”
Figure 3 in The connection of the intensity of the plankton community luminescence and the age distribution of horse mackerel in the coastal waters of the south-western Crimea
Figure 3. Relative quantity of the age groups the Trachurus mediterraneus (1-yearlings. 2 - two-year-olds. 3 - threeyear-olds. 4 - four-year-olds. 5 - five-year-olds) in the spring-summer period in the coastal waters of the south-western Crimea.
Broadband Laser-Induced Luminescence Generated in the Visible and Near-Infrared Ranges from Nontransparent CsPbCl3:Yb3+ Perovskite Ceramics
<p>ABSTRACT</p> <p>All inorganic perovskites with the general formula ABX<sub>3</sub> (A = alkaline cation, B = lead ions, and X = halide anion) in the form of colloids have become very popular in recent years due to their extraordinary spectroscopic properties, which can be additionally modulated by changing their structural composition. Here, we report for the first time a novel study considering nontransparent CsPbCl<sub>3</sub>:10%Yb<sup>3+</sup> ceramics that exhibit broadband laser-induced emission (LIE) with warm color (CRI = 96) upon exposure to a high-power-density infrared beam. It was found that the analyzed phenomenon strongly depends on the excitation power density and the pressure around the sample. Moreover, threshold behavior was observed, characterized by a significant increase in luminescence intensity already from the excitation of 0.2 W. The investigated material exhibits extremely strong photoconductivity. During the spectroscopic measurements of LIE, it was found that the current value varies by more than 4 orders of magnitude. Because of the relatively low sample temperature during the experiment, a LIE generation mechanism based on the creation of ytterbium mixed valence ion pairs and intervalence charge transfer (IVCT) transitions was proposed.</p>
Micro and nanocrystalline LuPO4 (Ln3+: Nd, Pr) – morphology, luminescence and inter-ionic interplays
<p><span lang="EN-US">This work was supported by the National Science Centre (NCN) under the OPUS 21 Project (Grant UMO-2021/41/ B/ST5/03792), which is gratefully acknowledged</span></p>
LATTE LAO thin films luminescence
<p>LATTE LAO thin films luminescence</p>
Making Nd3+ a Sensitive Luminescent Thermometer for Physiological Temperatures — An Account of Pitfalls in Boltzmann Thermometry
<p> Dataset accompanying figures published in the publication DOI: 10.3390/nano10030543</p>
Supplementary Data for Manuscript 'Observing impacts on luminescence depth profile evolutions from surface altered quartzite using OSL laser scanning and controlled light exposed rock sampling techniques'
<p>The attached file contains supplementary documents offered in the Quaternary Geochronology manuscript 'Observing<strong> </strong>impacts on luminescence depth profile evolutions from surface altered quartzite using OSL laser scanning and controlled light exposed rock sampling techniques' for the LED2023 special issue. </p>
Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence
<p>Raw dataset for the paper titled "Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence".</p>
Charge trapping for controllable persistent luminescence in organics
<p>Persistent luminescence, long-lived emission from inorganic or organic materials after the cessation of excitation, receives considerable attention in the field of optoelectronics. Despite great achievements in the past decades, the performance of organic materials still lags behind their inorganic counterparts, which have thousands of years of history. This is largely caused by the limited understanding of the mechanisms involved in organic materials. Here we report trap-induced persistent luminescence (TIP) in organic host-guest materials, with controllable trap depths from 0.11 to 0.56 eV and tunable afterglow emission at wavelengths from 507 to 669 nm via energy level engineering. The TIP phenomenon in a typical TN@TPBi film lasts for more than 24 h, with additional energy stored at room temperature for over 1 week. It is found that the trap depth in TIP is probably determined by the energy gap between the lowest unoccupied molecular orbitals of the radical anions of the host and guest molecules, matching well with density functional theory calculations. TIP was also observed after electrical excitation, demonstrating the potential of exploiting the semiconductor features of the organic hosts. These results provide a fundamental principle to design metal-free organic emitters of persistent luminescence, thereby expanding their applications in fields such as medical delivery identification, semiconductor devices, and imaging techniques.</p>
Engineering the Compositional Architecture of Core-Shell Upconverting Lanthanide-Doped Nanoparticles for Optimal Luminescent Donor in Resonance Energy Transfer: The Effects of Energy Migration and Storage
<p>Förster Resonance Energy Transfer (FRET) between single molecule donor (D) and acceptor (A) is well understood from fundamental perspective and is widely applied in biology, biotechnology, medical diagnostics and bio-imaging. However, the reliability of molecular FRET measurements can be affected by numerous artefacts which eventually hamper quantitative and reliable analysis, mostly due to issues with the donor and acceptor molecules. Lanthanide doped upconverting nanoparticles (UCNPs) have demonstrated their suitability as alternative donor species. Nevertheless, while they solved most disadvantageous features of organic donor molecules, such as photo-bleaching, spectral cross-excitation and emission bleed-through, the fundamental understanding and practical realizations of bio-assays with UCNP donors remain challenging. Among others, the actual donor ions in individual donor UCNPs are the numerous activator ions randomly distributed in the nanoparticle at various distances to acceptors anchored on the nanoparticle surface. Further, the power dependent, complex energy transfer upconversion and energy migration between sensitizing and activating lanthanide ions within UCNPs complicate the decay based analysis of <strong><em>D</em></strong>-<strong><em>A</em></strong> interaction. In this work, the assessment of designed virtual core-shell nanoparticle (VNP) models led us to the new designs of UCNPs, such as …@Er, Yb@Er, Yb@YbEr, which were experimentally evaluated as donor nanoparticles and compared to the simulations. Moreover, the specific properties of lanthanide-based upconversion motivated us to analyze not only steady-state luminescence and luminescence decay responses of both the UNCP donor and the sensitized acceptor, but also the effects of their luminescence rise kinetics upon RET was discussed in newly proposed disparity measurements. The presented studies help to understand the role of energy-transfer and energy migration between lanthanide ion dopants (due to their concentration and spatial distribution) and how the architecture of core-shell UCNPs affects their performance as FRET donors to organic acceptor dyes.</p>
Bifunctional upconverting luminescent-magnetic FeS2@NaYF4:Yb3+,Er3+ core@shell nanocomposites with tunable luminescence for temperature sensing†
<p>Advanced optically active materials have experienced significant development in recent years. Light-emitting materials combined with materials that exhibited magnetic properties result in bifunctional materials with an expanded range of capabilities and applications. New functionalities as a result of the core@shell structure enable interactions with the light and the external magnetic field as well. Continuous progress in materials science leads to innovations that enhance data storage and transmission, bioimaging, sensing, optical thermometry, and other applications crucial to advanced technology. In this research, we have focused on the optimization of the synthesis of a nano-sized FeS<span>2</span> material as an optically active, magnetic component of the core, and NaYF<span>4</span>:Yb<span>3+</span>,Er<span>3+</span> nanoparticles (NPs) as a temperature sensitive, up-conversion (UC) luminescence part of the shell. The synthesized core@shell type nanocomposite (NC) material FeS<span>2</span>@NaYF<span>4</span>:Yb<span>3+</span>,Er<span>3+</span> exhibits simultaneously the unique features of the core and shell components. The recorded UC emission spectra under 975 nm laser excitation show the possibility of tuning the UC luminescence color with the application of a highly absorbing FeS<span>2</span> component in the composite material. Moreover, the magnetic properties of the FeS<span>2</span> core nanoparticles and the synthesized NC were compared to confirm the potential application of the NC as a novel bifunctional luminescent-magnetic sensing platform. For both materials the luminescence color changed with the increasing laser power density, allowing color-tunable light generation. Additionally, optical temperature sensing properties of the NPs and NC were compared, resulting in a very high relative temperature sensitivity of <span>∼</span>2.0% K<span><span>−</span>1</span> for both materials.</p>
Imaging luminescence thermometry to 750 °C for the heat treatment of common engineering alloys and comparison with thermal imaging
<p>Data presented in the IJOT paper: Imaging luminescence thermometry to 750 °C for the heat treatment of common engineering alloys and comparison with thermal imaging</p>
Accurate In Vivo Nanothermometry through NIR-II Lanthanide Luminescence Lifetime
<p>Dataset of https://zenodo.org/record/5805844#.YcmOK2jMJPY</p>
From structural phase transition to highly sensitive lifetime based luminescent thermometer: multifaceted modification of thermometric performance in Y0.9xNdxYb0.1PO4 nanocrystals
<p>The development of a highly sensitive luminescent thermometer requires a deep understanding of the correlation between the structural properties of the host material and the temperature-dependent luminescence properties of lanthanide emitters embedded in these matrices. In some cases, the presence or increased concentration of the co-dopant ions can alter not only the spectral features, but may additionally cause far-ranging structural changes that further, even more tremendously, modify the luminescence properties of the phosphor. In this work, the temperature dependent luminescence kinetics in response to structural changes induced by increasing Nd<sup>3+</sup> ion doping in Y<sub>0.9−<em>x</em></sub>Nd<sub><em>x</em></sub>Yb<sub>0.1</sub>PO<sub>4</sub> nanocrystals are investigated, which correspondingly demonstrated phase transitions from xenotime to monazite structures. Consequently, the low temperature lifetime of the <sup>2</sup>F<sub>5/2</sub> state of Yb<sup>3+</sup> elongates. Moreover, by increasing the Nd<sup>3+</sup> amount, the relative sensitivity of the Yb<sup>3+</sup> luminescence lifetime-based luminescent thermometer was enhanced and, simultaneously, the temperature at which high sensitivity is achieved was reduced. The maximal relative sensitivity was found to be 2%/K at 273 K for Nd<sub>0.9</sub>Yb<sub>0.1</sub>PO<sub>4</sub> nanocrystals.</p>
The influence of the Er3+ dopant concentration in LaPO4:Nd3+, Er3+ on thermometric properties of ratiometric and kinetic-based luminescent thermometers operating in NIR II and NIR III optical windows
<p>In this work, properties of the near infrared absorbing and near infrared emitting Er<sup>3+</sup> and Nd<sup>3+</sup> co-doped LaPO<sub>4</sub> nanocrystals luminescent thermometer were investigated by exploiting luminescence spectra ratiometric and luminescence lifetime. The unique configuration of the energy levels of Nd<sup>3+</sup> and Er<sup>3+</sup> ions and the energy transfer between them requires temperature dependent phonon assistance. Since, the probability of this process is dependent on the distance between interacting ions, the thermometric parameters of luminescent thermometers were investigated as a function of Er<sup>3+</sup> dopant concentration. Strong susceptibility of its probability to temperature changes enables to quantify temperature with relative sensitivity as high as S<sub>R</sub> = 1.15%/K for LaPO<sub>4</sub>:1%Nd<sup>3+</sup>, 20%Er<sup>3+</sup> nanocrystals in the ratiometric approach and S<sub>R</sub> = 2.3%/K at 600 K for LaPO<sub>4</sub>:1%Nd<sup>3+</sup>, 5%Er<sup>3+</sup> in the luminescence lifetime based mode. The obtained results confirm the high applicative potential of this phosphor for remote temperature measurements.</p> <ul> </ul>
Original data for: Probing luminescence of rare earth ions in natural pink fluorites using Raman microscopes
<p>Data for Publication:</p> <p>Probing luminescence of rare earth ions in natural pink fluorites using Raman microscopes<br> Hans Hagemann, Sareh Ayoubipour, Teresa Delgado, Cédric Schnyder, Edwin Gnos</p> <p>Journal of Raman Spectroscopy, 2022;53:1464–1470</p> <p>https://doi.org/10.1002/jrs.6383</p> <p> </p>
Original data for publication: Luminescence spectroscopy of CaAl12O19:Eu3+ and SrAl12O19:Eu3+ nanoparticles
<p>Original data for publication:</p> <p>Luminescence spectroscopy of CaAl12O19:Eu3+ and SrAl12O19:Eu3+ nanoparticles<br> Jafar Afshani, Teresa Delgado, Gheorghe Paveliuc, Hans Hagemann, Journal of Luminescence 246 (2022) 118805.</p>
Unveiling MOF-808 Photocycle and its Interaction with Luminescent Guests
Open the record for dataset details and reuse information.
Metadata - Exploring the Luminescence, Redox, and Magnetic Properties in a Multivariate Metal–Organic Radical Framework
Open the record for dataset details and reuse information.
Dataset for publication: "Influence of Ag co-activation on the Dy3+ luminescence in lithium tetraborate glasses"
<p>Dataset for the article: I.I. Kindrat, B.V. Padlyak, A. Drzewiecki, V.T. Adamiv, I.M. Teslyuk, R. Lisiecki, Influence of Ag co-activation on the Dy<sup>3+</sup> luminescence in lithium tetraborate glasses, Mater. Res. Bull. 179 (2024) 112979, <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.materresbull.2024.112979" target="_blank" rel="noopener">https://doi.org/10.1016/j.materresbull.2024.112979</a></p>
Li1.8Na0.2TiO3:Mn4+: the highly sensitive probe for the low-temperature lifetime-based luminescence thermometry
<p>Dataset accompanying figures published in the publication <a href="https://zenodo.org/record/3552659">https://zenodo.org/record/3552659</a>.</p> <p> </p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.