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19 results for “upconversion”
Role of energy migration in the efficiency of upconversion-based resonance energy transfer to organic acceptors
<p>Graphs, data set and algorithms (in Matlab) for the article:</p> <div>Kotulska, A. M., Prorok, K., Bezkrovnyi, O., Pilch-Wrobel, A., & Bednarkiewicz, A. (2024). Role of energy migration in the efficiency of upconversion-based resonance energy transfer to organic acceptors. <em>Journal of Luminescence</em>, <em>275</em>, 120823. https://doi.org/10.1016/J.JLUMIN.2024.120823</div> <p>(https://www.sciencedirect.com/science/article/pii/S0022231324003879)<br>Abstract: Lanthanide (Ln)-doped upconverting nanocrystals (LnNPs) exhibit suitable features as energy donors for Förster resonance energy transfer (FRET). The sensitivity of biosensors can be improved by optically active materials with anti-Stokes emission, narrowband absorption and emission spectral lines, and long luminescence lifetimes. In contrast to energy reabsorption, energy transfer between the upconversion nanocrystals (UCNPs) and organic dyes attached to their surface can be observed through donor emission quenching and acceptor emission and decreases in the luminescence lifetimes of donors. Although the emission spectra confirmed that FRET occurred from the Er3+ ions to the Rose Bengal acceptor, the luminescence lifetimes were generally not affected by the presence of the acceptor. The Ln3+ dopant in LnNPs, which typically has 20–100 % Yb3+ sensitizer ions and 0.2–2% activator (Er3+/Tm3+/Ho3+) ions, results in hundreds to thousands of Ln3+ ions in a single UCNP. The interaction between multiple Ln3+ ions results in significant energy migration and storage in the Yb3+ sensitizer network, which is often recharged with the energy of the Er3+ ions when they emit and nonradiatively transfer their energy to acceptor species. However, the energy transfer mechanisms could not be unambiguously determined through spectroscopic data due to the nature the upconversion process. Studies confirmed that the energy migration distance was significantly shortened when the LnNP surface contained acceptors; this affected the energy storage and ‘recharging’ capability of the Yb3+ sensitizer network within the UCNPs. These results provide hints on the future use of LnNP as effective FRET probes, in which the highest possible absorption cross section and possibly lowest dopant concentration should be maintained.<br>Keywords: Nanocrystals; Resonance energy transfer; FRET; Monte Carlo; Lanthanide ions</p>
Supporting data and software for: Low-temperature open-air synthesis of PVP-coated NaYF4:Yb,Er,Mn upconversion nanoparticles with strong red emission
<p>Upconversion nanoparticles (UCNPs) have unique photonic properties that make them ideally suited for many applications. They are excited by low-energy near-infrared photons and emit at higher energy (typically visible) wavebands. However, synthesis of UCNPs requires either high pressure reaction chambers or inert atmospheres. Combined with the requirements for high-temperatures (200 to 400 °C) and long reaction times (e.g. up to 24 hours), these place barriers to entry for UCNP research, in terms of both financial barriers and knowledge/"know how". These constraints may also limit the scale of UCNP production for end-user applications.</p> <p>We adapted and further developed a method for producing UCNPs with simple laboratory equipment, i.e. a hot-plate and beakers. No pressure vessel or inert atmosphere is required. The UCNPs produced have a<span> polyvinylpyrrolidone (PVP) polymer coating, with strong red emission due to Mn<sup>2+</sup> co-doping within the UCNP crystal lattice. It was found that UCNPs of composition NaYF<sub>4</sub>:Yb,Er,Mn (Yb = 20 mol %, Er = 2 mol%, Mn = 35 mol%) maximised the red emission whilst also minimising the diameter of the UCNPs to </span> 36 ± 15 nm. These combination of optical and physical properties should make these UCNPs ideal for further development and exploitation, particularly for biological applications where red emission can penetrate over a centimetre of tissue.</p> <p>This dataset and software accompanies the manuscript <em>'Low-temperature open-air synthesis of PVP-coated NaYF<sub>4:</sub>Yb,Er,Mn upconversion nanoparticles with strong red emission</em>', which was published in Royal Society Open Science on 19th January 2022. https://doi.org/10.1098/rsos.211508</p>
Supporting data and software for: Low-temperature open-air synthesis of PVP-coated NaYF4:Yb,Er,Mn upconversion nanoparticles with strong red emission
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Photophysical lock-in detection enables background-free upconversion emission imaging
<p><strong><span lang="EN-GB">This folder contains all raw data underlying the results presented in a manuscript, submitted to <em>Nano Letters</em>, and entitled:</span></strong></p> <p><strong><span lang="EN-GB">Photophysical lock-in detection enables background-free upconversion emission imaging</span></strong></p> <p><strong><span lang="EN-GB">Authored by:</span></strong></p> <p><span lang="EN-GB">Niusha Bagheri<sup>a</sup>, Chenyi Wang<sup>b</sup>, Du Guo<sup>a</sup>, Anbharasi Lakshmanan<sup>a</sup>, Qi Zhu<sup>a</sup>, Xu Chen<sup>a</sup>, Nahid Ghazyani<sup>c</sup>, Qiuqiang Zhan<sup>b</sup>, Georgios A. Sotiriou<sup>d</sup>, Haichun Liu*<sup>a</sup>, Jerker Widengren*<sup>a</sup> </span></p> <p><em><sup><span lang="EN-GB">a</span></sup></em><em><span lang="EN-GB"> Experimental Biomolecular Physics, Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91, Stockholm, Sweden</span></em></p> <p><em><sup><span lang="EN-GB">b</span></sup></em><em><span lang="EN-GB"> Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China</span></em></p> <p><em><sup><span lang="EN-GB">c</span></sup></em><em><span lang="EN-GB"> Faculty of Physics, Kharazmi University, Tehran, Iran.</span></em></p> <p><em><sup><span lang="EN-GB">d</span></sup></em><em><span lang="EN-GB"> Department of Microbiology Tumor and Cell Biology Karolinska Institute, SE-171 77, Stockholm, Sweden</span></em></p> <p><span lang="EN-GB">Corresponding authors:</span></p> <p><span lang="EN-GB">*haichun@kth.se, jwideng@kth.se</span></p> <p><strong><span lang="EN-GB">The data files containing raw data and results of the analysis are grouped according to the different figures in the manuscript where the extracted results are presented.</span></strong></p> <p><strong><span lang="EN-GB">ABSTRACT</span></strong></p> <p><span><span lang="EN-GB">Lanthanide-based upconversion nanoparticles (UCNPs) have attracted considerable attention in biomedical applications, due to their anti-Stokes shifted emission enabling autofluorescence-free signal detection. However, residual excitation light can still interfere with their relatively low brightness. While commonly used lock-in detection can distinguish weak signals from substantial random background, concurrently modulated residual excitation light is not eliminated. This remains a challenge, particularly under demanding experimental conditions.</span></span></p> <p><span><span lang="EN-GB">Here, we </span></span><span><span><span lang="EN-GB">pro</span></span></span><span><span><span lang="EN-GB">pose a photophysical lock-in detection (PP-LID) approach based on the discovery that UCNPs can act as frequency mixers in response to intensity-modulated excitation. Particularly, modulated excitation with more than one base modulation frequency can generate additional low-frequency beating-signals. These signals are resolvable by frame-rate-limited cameras, devoid of ambient and residual excitation light, and can be regulated through nanoparticle engineering. Extracting beating-signals by PP-LID thus provides a strategy to significantly enhance signal-to-background conditions in UCNP-based bioimaging and biosensing.</span></span></span></p> <p><strong><span lang="EN-GB">Keywords: </span></strong><span lang="EN-GB">Upconversion nanoparticles (UCNPs), nonlinearity, modulation, lock-in detection, second harmonic, beating frequency, fast Fourier Transform (FFT)</span></p>
Terahertz field-driven magnon upconversion in an antiferromagnet
<p>This repository presents the raw data for the paper "Terahertz field-driven magnon upconversion in an antiferromagnet".</p><p>Data presented in the Supplementary Materials will be provided upon request. For such requests or general questions regarding the paper, please contact Zhuquan Zhang (zhuquan@mit.edu), Frank Y. Gao (frankgao@austin.utexas.edu), Edoardo Baldini (edoardo.baldini@austin.utexas.edu), or Keith Nelson (kanelson@mit.edu).</p>
Zinc(II) Complexes with Triplet Charge-Transfer Excited States Enabling Energy-Transfer Catalysis, Photoinduced Electron Transfer, and Upconversion
<p>Raw data to the graphs of the publication</p>
Raw data of the publication titled "First-row d6 metal complex enables photon upconversion and initiates blue light-dependent polymerization with red light"
<p>Raw data of the publication in Angew. Chem. Int. Ed. titled "First-row d<sup>6</sup> metal complex enables photon upconversion and initiates blue light-dependent polymerization with red light "</p>
Data from: multiexciton interactions in singlet fission and triplet fusion upconversion dendrimers
<p>Singlet fission (SF) and triplet-triplet annihilation upconversion (TTA-UC) are two multiexciton processes intimately related to the dynamic interaction between one high-lying energy singlet and two low-lying energy triplet excitons. Here, we introduce a series of dendritic macromolecules that serve as a platform to study the effect of interchromophore interactions on the dynamics of multiexciton generation and decay as a function of dendrimer generation. The dendrimers (generations 1-4) consist of trimethylolpropane (TMP) core and 2,2-bis(methylol)propionic acid (bis-MPA) dendrons that provide exponential growth of the branches, leading to a corona decorated with pentacenes for SF or anthracenes for TTA-UC. The findings reveal a trend where a few highly ordered sites emerge as the dendrimer generation grows, dominating the multiexciton dynamics, as deduced from optical spectra, and transient absorption spectroscopy. While the dendritic structures enhance TTA-UC at low annihilator concentrations in the largest dendrimers, the paired chromophore interactions induce a broadened and red-shifted excimer emission. In SF dendrimers of higher generations, the triplet dynamics become increasingly dominated by pairwise sites exhibiting strong coupling (Type II), which can be readily distinguished from sites with weaker coupling (Type I) by their spectral dynamics and decay kinetics.</p>
Isoacridone dyes with parallel reactivity from both singlet and triplet excited states for biphotonic catalysis and upconversion
<p>Raw data of the publication in Chem. Sci. titled "Isoacridone dyes with parallel reactivity from both singlet and triplet excited states for biphotonic catalysis and upconversion"</p>
Upconversion FRET quantitation: the role of donor photoexcitation mode and compositional architecture on the decay and intensity based responses
<p>Abstract</p> <p>Lanthanide-doped colloidal nanoparticles capable of photon upconversion (UC) offer long luminescence lifetimes, narrowband absorption and emission spectra, and efficient anti-Stokes emission. These features are highly advantageous for Förster Resonance Energy Transfer (FRET) based detection. Upconverting nanoparticles (UCNPs) as donors may solve the existing problems of molecular FRET systems, such as photobleaching and limitations in quantitative analysis, but these new labels also bring new challenges. Here we have studied the impact of the core-shell compositional architecture of upconverting nanoparticle donors and the mode of photoexcitation on the performance of UC-FRET from UCNPs to Rose Bengal (RB) molecular acceptor. We have quantitatively compared luminescence rise and decay kinetics of Er<sup>3+</sup> emission using core-only NaYF<sub>4</sub>: 20% Yb, 2% Er and core-shell NaYF<sub>4</sub>: 20% Yb @ NaYF<sub>4</sub>: 20% Yb, 5% Er donor UCNPs under three photoexcitation schemes: (1) direct short-pulse photoexcitation of Er<sup>3+</sup> at 520 nm; indirect photoexcitation of Er<sup>3+</sup> through Yb<sup>3+</sup> sensitizer with (2) 980 nm short (5–7 ns) or (3) 980 nm long (4 ms) laser pulses. The donor luminescence kinetics and steady-state emission spectra differed between the UCNP architectures and excitation schemes. Aiming for highly sensitive kinetic upconversion FRET-based biomolecular assays, the experimental results underline the complexity of the excitation and energy-migration mechanisms affecting the Er<sup>3+</sup> donor responses and suggest ways to optimize the photoexcitation scheme and the architecture of the UCNPs used as luminescent donors.</p>
Data from: multiexciton interactions in singlet fission and triplet fusion upconversion dendrimers
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Thermal properties of lipid bilayers determined using upconversion nanothermometry
<p>Dataset accompanying figures published in the publication DOI: 10.5281/zenodo.3597416</p>
Comparison of Three Ratiometric Temperature Readings from the Er3+ Upconversion Emission
<p>Data form the manuscript published in the Open Access Journal:</p> <p>Ćirić, A.; Aleksić, J.; Barudžija, T.; Antić, Ž.; Đorđević, V.; Medić, M.; Periša, J.; Zeković, I.; Mitrić, M.; Dramićanin, M.D. Comparison of Three Ratiometric Temperature Readings from the Er<sup>3+</sup> Upconversion Emission. Nanomaterials 2020, 10, 627; <a href="https://doi.org/10.3390/nano10040627">https://doi.org/10.3390/nano10040627</a></p> <p>This article belongs to the Special Issue Luminescent Rare-Earth-Based Nanomaterials</p>
Squaraine dyes for single-component shortwave infrared-sensitive photodiodes and upconversion photodetectors
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Interplay between a heptamethine cyanine dye sensitizer (IR806) and lanthanide upconversion nanoparticles
<p><strong>This folder contains all raw data underlying the results presented in a manuscript, submitted to </strong><strong><em>Angewandte Chemie</em></strong><strong>, and entitled:</strong></p> <p><strong>Interplay between a heptamethine cyanine dye sensitizer (IR806) and lanthanide upconversion nanoparticles</strong></p> <p><strong>Authored by:</strong></p> <p>Haichun Liu<sup>1</sup>, Abhilash Kulkarni<sup>1</sup>, Uliana Kostiv<sup>1</sup>, Elin Sandberg<sup>1</sup>, Anbharasi Lakshmanan<sup>1</sup>, Georgios A. Sotiriou<sup>2</sup>, Jerker Widengren<sup>1,*</sup></p> <p><em><sup>1</sup></em><em> Department of Applied Physics, KTH Royal Institute of Technology, Roslagstullsbacken 21, SE-106 91, Stockholm, Sweden</em></p> <p><em><sup>2</sup></em><em>Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77, Stockholm, Sweden</em></p> <p>Corresponding author:</p> <p>*<u>jwideng@kth.se</u></p> <p><strong>The data files containing raw data and results of the analysis are grouped according to the different figures in the manuscript where the extracted results are presented.</strong></p> <p><strong>ABSTRACT</strong></p> <p><span>Lanthanide-doped upconversion nanoparticles (UCNPs) have attractive emission properties but suffer from weak light-absorbing capacities and thereby relatively low brightnesses. This motivates using strongly absorbing dye molecules as antennas and sensitizers. However, despite much effort, understanding of this dye-UCNP interplay is still limited. Major sensitization mechanisms are still under discussion, largely because there is a lack of effective means to observe key factors such as dark state transitions within the dyes. Here, we established a combined spectroscopic procedure to systematically investigate the photophysics behind the dye-UCNP interaction, embracing fluorescence-based transient-state excitation-modulation, lifetime and correlation spectroscopy, and spectrofluorometry/spectrophotometry. With this procedure we studied the heptamethine cyanine dye IR806, a typical UCNP sensitizer, established its photophysical model, deciphered its photophysics in UCL-sensitization-related environments and could identify energy transfer from the IR806 singlet excited state to Yb<sup>3+</sup> (UCNP sensitizer ion) as the dominant sensitization mechanism. Our studies suggest that IR806 can form non-emissive H-aggregates at the nanoparticle surfaces, which can be dissociated after certain light excitation duration (typically>100µs). Moreover, buildup of a non-fluorescent, photo-redox state of IR806 after longer irradiation times (10–100ms) can deleteriously affect its UCL sensitization, inferring an optimal excitation duration for dye-sensitized UCNPs, relevant for e.g. optical imaging applications.</span></p>
UV Light Generation and Challenging Photoreactions Enabled by Upconversion in Water
<p>Data underlying the figures in the publication “UV Light Generation and Challenging Photoreactions Enabled by Upconversion in Water”, published in <em>J. Am. Chem. Soc.</em> <strong>2020</strong>, 142, 23, 10468–10476. <a href="https://pubs.acs.org/doi/10.1021/jacs.0c02835">https://pubs.acs.org/doi/10.1021/jacs.0c02835</a></p> <p>Table of contents:</p> <p><strong>1. Figure 2</strong>; Excel file with the numerical values of the sensitizer characteristics displayed in <em>Figure 2</em>.</p> <p>Experimental data summarizing the pertinent ground- and excited-state properties of the Ir-based sensitizers (<em>a</em>, <strong>Ir(sCH<sub>2</sub>ppy)ppy<sub>2</sub></strong>; <em>b</em>, <strong>Irsppy</strong>; <em>c</em>, <strong>IrFsppy</strong>; and <em>d</em>, <strong>IrdFsppy</strong>).</p> <p><strong>2. Figure 3</strong>; Excel file with the numerical values of the photophysical properties of the acceptors/annihilators under study (<em>a</em>, <strong>NDS</strong>; <em>b</em>, <strong>NPX</strong>) displayed in <em>Figure 3</em>.</p> <p><strong>3. Figure 4</strong>; Excel file with the numerical values of the spectroscopic investigations on the upconversion mechanism, displayed in <em>Figure 4</em>.</p> <p><strong>4. Figure 5</strong>; Excel file with the numerical values of the kinetics of the C-Br bond activation for the study of the reductive debromination, displayed in <em>Figure 5</em>.</p>
Experimental data for "Photomultiplication Enabling Efficient Shortwave Infrared-Sensitive Organic Upconversion Devices"
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The effects of dopant concentration and excitation intensity on the upconversion and downconversion emission processes of β-NaYF4:Yb3+,Er3+ nanoparticles
<p>Dataset of https://zenodo.org/record/5810201#.Yc2XjGjMJPZ</p>
Frequency-domain method for characterization of upconversion luminescence kinetics
<p><strong>This folder contains all raw data underlying the results presented in a manuscript, submitted to </strong><strong><em>The Journal of Physical Chemistry Letters</em></strong><strong>, and entitled:</strong></p> <p><strong>Frequency-domain method </strong><strong>for </strong><strong>characterization of upconversion luminescence kinetics</strong></p> <p><strong>Authored by:</strong></p> <p>Lucía Labrador-Páez,<sup>a</sup> Jouko Kankare,<sup>b</sup> Iko Hyppänen,<sup>b</sup> Tero Soukka,<sup>b,</sup>* Elina Andresen,<sup>c</sup> Ute Resch-Genger,<sup>c</sup> Jerker Widengren,<sup>a</sup> Haichun Liu<sup>a,</sup>*</p> <p><em><sup>a </sup></em><em>Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, Sweden. </em></p> <p><em><sup>b </sup></em><em>University of Turku, Turku, Finland.</em></p> <p><em><sup>c</sup></em> <em>Federal Institute for Materials Research and Testing (BAM), Berlin, Germany. </em></p> <p>*Corresponding authors: <a href="mailto:haichun@kth.se"><em>haichun@kth.se</em></a><em>; tejoso@utu.fi.</em></p> <p> </p> <p><strong>The data files are grouped according to the different figures in the manuscript where the extracted results are presented.</strong></p> <p> </p> <p><strong>ABSTRACT</strong></p> <p>The frequency-domain (FD) method provides an alternative to the commonly used time-domain (TD) approach in characterizing the luminescence kinetics of luminophores. This method has its own strengths compared to the TD approach, e.g., the capability to decouple multiple lifetime components with higher reliability and accuracy. While extensively explored for characterizing luminophores with a linear emission, the FD method has not been investigated for studying nonlinear luminescent materials such as lanthanide-doped upconversion nanoparticles (UCNPs), featuring more complicated luminescence kinetics. In this work, employing a simplified rate-equation model representing a standard two-photon energy-transfer upconversion process, we thoroughly analysed the response of the upconversion luminescence (UCL) of UCNPs in the FD method in theory. We found that the application of this method can potentially obtain the effective decay rates of three critical energy states of the sensitizer and activator ions involved in the upconversion process, from a single experiment. The validity of the FD method is further demonstrated by experimental data, agreeing reasonably well with the results obtained by TD methods.</p>
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