Zeitschriftenartikel: „Photon-upconversion nanoparticles“

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Chen, Xian, Denfeng Peng, Qiang Ju und Feng Wang. „Photon upconversion in core–shell nanoparticles“. Chemical Society Reviews 44, Nr. 6 (2015): 1318–30. http://dx.doi.org/10.1039/c4cs00151f.

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Lee, Eunsang, Minhyuk Jung, Youngeun Han, Gibok Lee, Kyujin Shin, Hohjai Lee und Kang Taek Lee. „Stochastic Photon Emission from Nonblinking Upconversion Nanoparticles“. Journal of Physical Chemistry C 121, Nr. 38 (19.09.2017): 21073–79. http://dx.doi.org/10.1021/acs.jpcc.7b08509.

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3

Qu, Zuoming, Pengfei Duan, Jin Zhou, Yafei Wang und Minghua Liu. „Photon upconversion in organic nanoparticles and subsequent amplification by plasmonic silver nanowires“. Nanoscale 10, Nr. 3 (2018): 985–91. http://dx.doi.org/10.1039/c7nr07340b.

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4

Liu, Wen, Runze Chen und Sailing He. „Ultra-stable near-infrared Tm3+-doped upconversion nanoparticles for in vivo wide-field two-photon angiography with a low excitation intensity“. Journal of Innovative Optical Health Sciences 12, Nr. 03 (Mai 2019): 1950013. http://dx.doi.org/10.1142/s1793545819500135.

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Two-photon luminescence with near-infrared (NIR) excitation of upconversion nanoparticles (NPs) is of great importance in biological imaging due to deep penetration in high-scattering tissues, low auto-luminescence and good sectioning ability. Unfortunately, common two-photon luminescence is in visible band with an extremely high exciation power density, which limits its application. Here, we synthesized NaYF4:Yb[Formula: see text]Tm@NaYF4 upconversion NPs with strong two-photon NIR emission and a low excitation power density. Furthermore, NaYF4:Yb[Formula: see text]Tm@NaYF4@SiO2@OTMS@F127 NPs with high chemical stability were obtained by a modified multilayer coating method which was applied to upconversion NPs for the first time. In addition, it is shown that the as-prepared hydrophillic upconversion NPs have great biocompatibility and kept stable for 6 hours during in vivo whole-body imaging. The vessels with two-photon luminescence were clear even under an excitation power density as low as 25[Formula: see text]mW[Formula: see text]cm2. Vivid visualizations of capillaries and vessels in a mouse brain were also obtained with low background and high contrast. Because of cheaper instruments and safer power density, the NIR two-photon luminescence of NaYF4:Yb[Formula: see text]Tm@NaYF4 upconversion NPs could promote wider application of two-photon technology. The modified multilayer coating method could be widely used for upconversion NPs to increase the stable time of the in vivo circulation. Our work possesses a great potential for deep imaging and imaging-guided treatment in the future.

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Shuai Ye, Shuai Ye, Jun Song Jun Song, Dong Wang Dong Wang, Yuliang Tian Yuliang Tian, Junle Qu Junle Qu und and Hanben Niu and Hanben Niu. „Reduced photon quenching in Ce-doped NaYF4:Yb/Ho upconversion nanoparticles with core/shell structure“. Chinese Optics Letters 14, Nr. 2 (2016): 021601–21605. http://dx.doi.org/10.3788/col201614.021601.

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Chen, Xian, Denfeng Peng, Qiang Ju und Feng Wang. „ChemInform Abstract: Photon Upconversion in Core-Shell Nanoparticles“. ChemInform 46, Nr. 21 (Mai 2015): no. http://dx.doi.org/10.1002/chin.201521300.

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Poláchová, Veronika, Matěj Pastucha, Zuzana Mikušová, Matthias J. Mickert, Antonín Hlaváček, Hans H. Gorris, Petr Skládal und Zdeněk Farka. „Click-conjugated photon-upconversion nanoparticles in an immunoassay for honeybee pathogen Melissococcus plutonius“. Nanoscale 11, Nr. 17 (2019): 8343–51. http://dx.doi.org/10.1039/c9nr01246j.

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A method for the conjugation of photon-upconversion nanoparticles with streptavidin via copper-free click-chemistry was introduced, and the prepared label was applied in an immunoassay for European foulbrood diagnosis.

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Gao, Zhao, Lulu Shi, Xiao Ling, Ze Chen, Qingsong Mei und Feng Wang. „Near-infrared photon-excited energy transfer in platinum(ii)-based supramolecular polymers assisted by upconverting nanoparticles“. Chemical Communications 57, Nr. 15 (2021): 1927–30. http://dx.doi.org/10.1039/d0cc07445d.

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A hybrid supramolecular system with near-infrared photon-excited energy transfer has been successfully constructed, relying on the assistance of upconversion nanoparticles in platinum(ii)-based supramolecular polymers.

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Dong, Hao, Ling-Dong Sun, Ye-Fu Wang, Jia-Wen Xiao, Datao Tu, Xueyuan Chen und Chun-Hua Yan. „Photon upconversion in Yb3+–Tb3+ and Yb3+–Eu3+ activated core/shell nanoparticles with dual-band excitation“. Journal of Materials Chemistry C 4, Nr. 19 (2016): 4186–92. http://dx.doi.org/10.1039/c6tc00413j.

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Huang, Ying-Ying, Sulbha K. Sharma, Tianhong Dai, Hoon Chung, Anastasia Yaroslavsky, Maria Garcia-Diaz, Julie Chang, Long Y. Chiang und Michael R. Hamblin. „Can nanotechnology potentiate photodynamic therapy?“ Nanotechnology Reviews 1, Nr. 2 (01.03.2012): 111–46. http://dx.doi.org/10.1515/ntrev-2011-0005.

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AbstractPhotodynamic therapy (PDT) uses the combination of nontoxic dyes and harmless visible light to produce reactive oxygen species that can kill cancer cells and infectious microorganisms. Due to the tendency of most photosensitizers (PS) to be poorly soluble and to form nonphotoactive aggregates, drug-delivery vehicles have become of high importance. The nanotechnology revolution has provided many examples of nanoscale drug-delivery platforms that have been applied to PDT. These include liposomes, lipoplexes, nanoemulsions, micelles, polymer nanoparticles (degradable and nondegradable), and silica nanoparticles. In some cases (fullerenes and quantum dots), the actual nanoparticle itself is the PS. Targeting ligands such as antibodies and peptides can be used to increase specificity. Gold and silver nanoparticles can provide plasmonic enhancement of PDT. Two-photon excitation or optical upconversion can be used instead of one-photon excitation to increase tissue penetration at longer wavelengths. Finally, after sections on in vivo studies and nanotoxicology, we attempt to answer the title question, “can nanotechnology potentiate PDT?”

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Farka, Zdeněk, Matthias J. Mickert, Zuzana Mikušová, Antonín Hlaváček, Pavla Bouchalová, Wenshu Xu, Pavel Bouchal, Petr Skládal und Hans H. Gorris. „Surface design of photon-upconversion nanoparticles for high-contrast immunocytochemistry“. Nanoscale 12, Nr. 15 (2020): 8303–13. http://dx.doi.org/10.1039/c9nr10568a.

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Huang, Ling, Eugenia Kakadiaris, Tereza Vaneckova, Kai Huang, Marketa Vaculovicova und Gang Han. „Designing next generation of photon upconversion: Recent advances in organic triplet-triplet annihilation upconversion nanoparticles“. Biomaterials 201 (Mai 2019): 77–86. http://dx.doi.org/10.1016/j.biomaterials.2019.02.008.

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Guo, Shaohong, Xiaoji Xie, Ling Huang und Wei Huang. „Sensitive Water Probing through Nonlinear Photon Upconversion of Lanthanide-Doped Nanoparticles“. ACS Applied Materials & Interfaces 8, Nr. 1 (24.12.2015): 847–53. http://dx.doi.org/10.1021/acsami.5b10192.

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Xie, Xiaoji, Nengyue Gao, Renren Deng, Qiang Sun, Qing-Hua Xu und Xiaogang Liu. „Mechanistic Investigation of Photon Upconversion in Nd3+-Sensitized Core–Shell Nanoparticles“. Journal of the American Chemical Society 135, Nr. 34 (19.08.2013): 12608–11. http://dx.doi.org/10.1021/ja4075002.

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Gorris, Hans H., und Ute Resch-Genger. „Perspectives and challenges of photon-upconversion nanoparticles - Part II: bioanalytical applications“. Analytical and Bioanalytical Chemistry 409, Nr. 25 (07.07.2017): 5875–90. http://dx.doi.org/10.1007/s00216-017-0482-8.

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Ju, Xiuhao, Jialei Song, Jianlei Han, Yonghong Shi, Yuan Gao und Pengfei Duan. „Photofluorochromic water-dispersible nanoparticles for single-photon-absorption upconversion cell imaging“. Nanotechnology 32, Nr. 47 (02.09.2021): 475606. http://dx.doi.org/10.1088/1361-6528/ac137f.

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Mahata, Manoj Kumar, Ranjit De und Kang Taek Lee. „Near-Infrared-Triggered Upconverting Nanoparticles for Biomedicine Applications“. Biomedicines 9, Nr. 7 (29.06.2021): 756. http://dx.doi.org/10.3390/biomedicines9070756.

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Due to the unique properties of lanthanide-doped upconverting nanoparticles (UCNP) under near-infrared (NIR) light, the last decade has shown a sharp progress in their biomedicine applications. Advances in the techniques for polymer, dye, and bio-molecule conjugation on the surface of the nanoparticles has further expanded their dynamic opportunities for optogenetics, oncotherapy and bioimaging. In this account, considering the primary benefits such as the absence of photobleaching, photoblinking, and autofluorescence of UCNPs not only facilitate the construction of accurate, sensitive and multifunctional nanoprobes, but also improve therapeutic and diagnostic results. We introduce, with the basic knowledge of upconversion, unique properties of UCNPs and the mechanisms involved in photon upconversion and discuss how UCNPs can be implemented in biological practices. In this focused review, we categorize the applications of UCNP-based various strategies into the following domains: neuromodulation, immunotherapy, drug delivery, photodynamic and photothermal therapy, bioimaging and biosensing. Herein, we also discuss the current emerging bioapplications with cutting edge nano-/biointerfacing of UCNPs. Finally, this review provides concluding remarks on future opportunities and challenges on clinical translation of UCNPs-based nanotechnology research.

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Peng, Tingting, Rui Pu, Baoju Wang, Zhimin Zhu, Kai Liu, Fan Wang, Wei Wei, Haichun Liu und Qiuqiang Zhan. „The Spectroscopic Properties and Microscopic Imaging of Thulium-Doped Upconversion Nanoparticles Excited at Different NIR-II Light“. Biosensors 11, Nr. 5 (10.05.2021): 148. http://dx.doi.org/10.3390/bios11050148.

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Lanthanide-doped upconversion nanoparticles (UCNPs) are promising bioimaging nanoprobes due to their excellent photostability. As one of the most commonly used lanthanide activators, Tm3+ ions have perfect ladder-type electron configuration and can be directly excited by bio-friendly near-infrared-II (NIR-II) wavelengths. Here, the emission characteristics of Tm3+-doped nanoparticles under laser excitations of different near-infrared-II wavelengths were systematically investigated. The 1064 nm, 1150 nm, and 1208 nm lasers are proposed to be three excitation strategies with different response spectra of Tm3+ ions. In particular, we found that 1150 nm laser excitation enables intense three-photon 475 nm emission, which is nearly 100 times stronger than that excited by 1064 nm excitation. We further optimized the luminescence brightness after investigating the luminescence quenching mechanism of bare NaYF4: Tm (1.75%) core. After growing an inert shell, a ten-fold increase of emission intensity was achieved. Combining the advantages of NIR-II wavelength and the higher-order nonlinear excitation, a promising facile excitation strategy was developed for the application of thulium-doped upconversion nanoparticles in nanoparticles imaging and cancer cell microscopic imaging.

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Prieto, Martin, Alina Y. Rwei, Teresa Alejo, Tuo Wei, Maria Teresa Lopez-Franco, Gracia Mendoza, Victor Sebastian, Daniel S. Kohane und Manuel Arruebo. „Light-Emitting Photon-Upconversion Nanoparticles in the Generation of Transdermal Reactive-Oxygen Species“. ACS Applied Materials & Interfaces 9, Nr. 48 (21.11.2017): 41737–47. http://dx.doi.org/10.1021/acsami.7b14812.

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da Silva, Jefferson F., Rodrigo F. da Silva, Emanuel P. Santos, Lauro J. Q. Maia und André L. Moura. „Photon-avalanche-like upconversion in NdAl3(BO3)4 nanoparticles excited at 1064 nm“. Applied Physics Letters 117, Nr. 15 (12.10.2020): 151102. http://dx.doi.org/10.1063/5.0024619.

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Chen, Kun, Wenhong Su, Yue Wang, Huan Ge, Kun Zhang, Yangbo Wang, Xiaoji Xie, Vincent G. Gomes, Handong Sun und Ling Huang. „Nanocomposites of carbon nanotubes and photon upconversion nanoparticles for enhanced optical limiting performance“. Journal of Materials Chemistry C 6, Nr. 27 (2018): 7311–16. http://dx.doi.org/10.1039/c8tc01576g.

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Yang, Bingxiao, Yangbo Wang, Tian Wei, Yue Pan, Enlong Zhou, Ze Yuan, Yingdong Han et al. „Solution-Processable Near-Infrared-Responsive Composite of Perovskite Nanowires and Photon-Upconversion Nanoparticles“. Advanced Functional Materials 28, Nr. 31 (19.06.2018): 1801782. http://dx.doi.org/10.1002/adfm.201801782.

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Chen, Xiaohu, Zhengyu Gui, Yong Liang, Xin Jin, Simin Li, Pengjiu Zhao, Zhangsen Yu, Aiguo Wu, Shoupeng Liu und Hui Li. „Characterizing the luminescent properties of upconversion nanoparticles in single and densely packed state“. Journal of Innovative Optical Health Sciences 12, Nr. 01 (Januar 2019): 1841004. http://dx.doi.org/10.1142/s1793545818410043.

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Luminescent properties of Er[Formula: see text]- and Yb[Formula: see text]- co-doped CaF2 upconversion nanoparticles (UCNPs) were investigated in single particle and densely-packed states with a custom-built microscope. The single UCNPs exhibit linear dependency of luminescent intensity on excitation power while the densely-packed UCNPs exhibit a 2-order power law-dependency indicating a two-photon absorption process. Time-domain luminescence intensity measurements were performed and the curves were fitted to excitation[Formula: see text]emission rate functions based on a simplified three-state model. The results indicate that the intermediates in single particles are much less and saturated in a short time, and there are strong couplings of the ground states and intermediate states between neighboring UCNPs in densely packed UCNPs.

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Wickerts, Sanna, Rickard Arvidsson, Björn A. Sandén, Gregory Peters, Lili Hou und Bo Albinsson. „Prospective Life-Cycle Modeling of Quantum Dot Nanoparticles for Use in Photon Upconversion Devices“. ACS Sustainable Chemistry & Engineering 9, Nr. 14 (01.04.2021): 5187–95. http://dx.doi.org/10.1021/acssuschemeng.1c00376.

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Hlaváček, Antonín, Matthias J. Mickert, Tero Soukka, Satu Lahtinen, Terhi Tallgren, Naděžda Pizúrová, Anna Król und Hans H. Gorris. „Large-Scale Purification of Photon-Upconversion Nanoparticles by Gel Electrophoresis for Analogue and Digital Bioassays“. Analytical Chemistry 91, Nr. 2 (10.12.2018): 1241–46. http://dx.doi.org/10.1021/acs.analchem.8b04488.

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Yonemura, Hiroaki, Yuji Naka, Ryuji Matsumoto und Sunao Yamada. „Effects of Silver and Gold Nanoparticles on Photon Upconversion Based on Sensitized Triplet-Triplet Annihilation“. Transactions of the Materials Research Society of Japan 40, Nr. 3 (2015): 195–201. http://dx.doi.org/10.14723/tmrsj.40.195.

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Perego, Jacopo, Jacopo Pedrini, Charl X. Bezuidenhout, Piero E. Sozzani, Francesco Meinardi, Silvia Bracco, Angiolina Comotti und Angelo Monguzzi. „Engineering Porous Emitting Framework Nanoparticles with Integrated Sensitizers for Low‐Power Photon Upconversion by Triplet Fusion“. Advanced Materials 31, Nr. 40 (22.08.2019): 1903309. http://dx.doi.org/10.1002/adma.201903309.

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Gee, William J. „Recent Trends Concerning Upconversion Nanoparticles and Near-IR Emissive Lanthanide Materials in the Context of Forensic Applications“. Australian Journal of Chemistry 72, Nr. 3 (2019): 164. http://dx.doi.org/10.1071/ch18502.

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Upconversion nanoparticles (UCNPs) are materials that, upon absorbing multiple photons of low energy (e.g. infrared radiation), subsequently emit a single photon of higher energy, typically within the visible spectrum. The physics of these materials have been the subject of detailed investigations driven by the potential application of these materials as medical imaging devices. One largely overlooked application of UCNPs is forensic science, wherein the ability to produce visible light from infrared light sources would result in a new generation of fingerprint powders that circumvent background interference which can be encountered with visible and ultraviolet light sources. Using lower energy, infrared radiation would simultaneously improve the safety of forensic practitioners who often employ light sources in less than ideal locations. This review article covers the development of UCNPs, the use of infrared radiation to visualise fingerprints by the forensic sciences, and the potential benefits of applying UCNP materials over current approaches.

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Resch-Genger, Ute, und Hans H. Gorris. „Perspectives and challenges of photon-upconversion nanoparticles - Part I: routes to brighter particles and quantitative spectroscopic studies“. Analytical and Bioanalytical Chemistry 409, Nr. 25 (14.07.2017): 5855–74. http://dx.doi.org/10.1007/s00216-017-0499-z.

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Modlitbová, Pavlína, Antonín Hlaváček, Tereza Švestková, Pavel Pořízka, Lucie Šimoníková, Karel Novotný und Jozef Kaiser. „The effects of photon-upconversion nanoparticles on the growth of radish and duckweed: Bioaccumulation, imaging, and spectroscopic studies“. Chemosphere 225 (Juni 2019): 723–34. http://dx.doi.org/10.1016/j.chemosphere.2019.03.074.

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Zhong, Yeteng, Gan Tian, Zhanjun Gu, Yijun Yang, Lin Gu, Yuliang Zhao, Ying Ma und Jiannian Yao. „Luminescent Nanoparticles: Elimination of Photon Quenching by a Transition Layer to Fabricate a Quenching-Shield Sandwich Structure for 800 nm Excited Upconversion Luminescence of Nd3+ -Sensitized Nanoparticles (Adv. Mater. 18/2014)“. Advanced Materials 26, Nr. 18 (Mai 2014): 2766. http://dx.doi.org/10.1002/adma.201470117.

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Zhong, Yeteng, Gan Tian, Zhanjun Gu, Yijun Yang, Lin Gu, Yuliang Zhao, Ying Ma und Jiannian Yao. „Elimination of Photon Quenching by a Transition Layer to Fabricate a Quenching-Shield Sandwich Structure for 800 nm Excited Upconversion Luminescence of Nd3+-Sensitized Nanoparticles“. Advanced Materials 26, Nr. 18 (12.12.2013): 2831–37. http://dx.doi.org/10.1002/adma.201304903.

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Modlitbová, Pavlína, Sára Střítežská, Antonín Hlaváček, David Prochazka, Pavel Pořízka und Jozef Kaiser. „Laser-induced breakdown spectroscopy as a straightforward bioimaging tool for plant biologists; the case study for assessment of photon-upconversion nanoparticles in Brassica oleracea L. plant“. Ecotoxicology and Environmental Safety 214 (Mai 2021): 112113. http://dx.doi.org/10.1016/j.ecoenv.2021.112113.

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Wang, Jiaying, Haiying Wang, Sijin Zuo, Xuming Jin, Bingzhu Zheng, Renren Deng, Weiping Liu und Juan Wang. „Synergistic effects of lanthanide surface adhesion and photon-upconversion for enhanced near-infrared responsive photodegradation of organic contaminants in wastewater“. Environmental Science: Nano 7, Nr. 11 (2020): 3333–42. http://dx.doi.org/10.1039/d0en00670j.

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Upconversion nanoparticle-TiO₂ catalyst with Gd³⁺-rich surface shows stronger binding coefficiency to the carboxyl groups, resulting in faster ring cleavage and higher mineralization efficiency of rhodamine B under NIR light irradiation.

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Yonemura, Hiroaki, Yuji Naka, Mitsuhiro Nishino, Hiroshi Sakaguchi und Sunao Yamada. „Effect of gold nanoparticle on photon upconversion based on sensitized triplet–triplet annihilation in polymer films“. Molecular Crystals and Liquid Crystals 654, Nr. 1 (02.09.2017): 196–200. http://dx.doi.org/10.1080/15421406.2017.1358044.

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Martínez, Eduardo D., ALI FRANCISCO GARCIA FLORES, Albano Carneiro Neto, Carlos D. S. Brites, Luis Antonio Dias Carlos, Ricardo R. Urbano und Carlos Rettori. „Controlling the Thermal Switching in Upconverting Nanoparticles Through Surface Chemistry“. Nanoscale, 2021. http://dx.doi.org/10.1039/d1nr03223b.

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Photon upconversion taking place in small rare-earth-doped nanoparticles has been recently observed to be thermally modulated in an anomalous manner, showing thermal enhancement of the emission intensity. This effect was...

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Su, Qianqian, Han-Lin Wei, Yachong Liu, Chaohao Chen, Ming Guan, Shuai Wang, Yan Su, Haifang Wang, Zhigang Chen und Dayong Jin. „Six-photon upconverted excitation energy lock-in for ultraviolet-C enhancement“. Nature Communications 12, Nr. 1 (16.07.2021). http://dx.doi.org/10.1038/s41467-021-24664-x.

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AbstractPhoton upconversion of near-infrared (NIR) irradiation into ultraviolet-C (UVC) emission offers many exciting opportunities for drug release in deep tissues, photodynamic therapy, solid-state lasing, energy storage, and photocatalysis. However, NIR-to-UVC upconversion remains a daunting challenge due to low quantum efficiency. Here, we report an unusual six-photon upconversion process in Gd3+/Tm3+-codoped nanoparticles following a heterogeneous core-multishell architecture. This design efficiently suppresses energy consumption induced by interior energy traps, maximizes cascade sensitizations of the NIR excitation, and promotes upconverted UVC emission from high-lying excited states. We realized the intense six-photon-upconverted UV emissions at 253 nm under 808 nm excitation. This work provides insight into mechanistic understanding of the upconversion process within the heterogeneous architecture, while offering exciting opportunities for developing nanoscale UVC emitters that can be remotely controlled through deep tissues upon NIR illumination.

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Chen, Chaohao, Fan Wang, Shihui Wen, Qian Peter Su, Mike C. L. Wu, Yongtao Liu, Baoming Wang et al. „Multi-photon near-infrared emission saturation nanoscopy using upconversion nanoparticles“. Nature Communications 9, Nr. 1 (17.08.2018). http://dx.doi.org/10.1038/s41467-018-05842-w.

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Kostiv, Uliana, Jan Kučka, Volodymyr Lobaz, Nikolay Kotov, Olga Janoušková, Miroslav Šlouf, Bartosz Krajnik et al. „Highly colloidally stable trimodal 125I-radiolabeled PEG-neridronate-coated upconversion/magnetic bioimaging nanoprobes“. Scientific Reports 10, Nr. 1 (18.11.2020). http://dx.doi.org/10.1038/s41598-020-77112-z.

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Abstract“All-in-one” multifunctional nanomaterials, which can be visualized simultaneously by several imaging techniques, are required for the efficient diagnosis and treatment of many serious diseases. This report addresses the design and synthesis of upconversion magnetic NaGdF4:Yb3+/Er3+(Tm3+) nanoparticles by an oleic acid-stabilized high-temperature coprecipitation of lanthanide precursors in octadec-1-ene. The nanoparticles, which emit visible or UV light under near-infrared (NIR) irradiation, were modified by in-house synthesized PEG-neridronate to facilitate their dispersibility and colloidal stability in water and bioanalytically relevant phosphate buffered saline (PBS). The cytotoxicity of the nanoparticles was determined using HeLa cells and human fibroblasts (HF). Subsequently, the particles were modified by Bolton-Hunter-neridronate and radiolabeled by 125I to monitor their biodistribution in mice using single-photon emission computed tomography (SPECT). The upconversion and the paramagnetic properties of the NaGdF4:Yb3+/Er3+(Tm3+)@PEG nanoparticles were evaluated by photoluminescence, magnetic resonance (MR) relaxometry, and magnetic resonance imaging (MRI) with 1 T and 4.7 T preclinical scanners. MRI data were obtained on phantoms with different particle concentrations and during pilot long-time in vivo observations of a mouse model. The biological and physicochemical properties of the NaGdF4:Yb3+/Er3+(Tm3+)@PEG nanoparticles make them promising as a trimodal optical/MRI/SPECT bioimaging and theranostic nanoprobe for experimental medicine.

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Brandmeier, Julian C., Kirsti Raiko, Zdeněk Farka, Riikka Peltomaa, Matthias J. Mickert, Antonín Hlaváček, Petr Skládal, Tero Soukka und Hans H. Gorris. „Effect of Particle Size and Surface Chemistry of Photon‐Upconversion Nanoparticles on Analog and Digital Immunoassays for Cardiac Troponin“. Advanced Healthcare Materials, 15.07.2021, 2100506. http://dx.doi.org/10.1002/adhm.202100506.

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de Oliveira Lima, Karmel, Luiz Fernando dos Santos, Rodrigo Galvão, Antonio Claudio Tedesco, Leonardo de Souza Menezes und Rogéria Rocha Gonçalves. „Single Er3+, Yb3+: KGd3F10 Nanoparticles for Nanothermometry“. Frontiers in Chemistry 9 (21.07.2021). http://dx.doi.org/10.3389/fchem.2021.712659.

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Among several optical non-contact thermometry methods, luminescence thermometry is the most versatile approach. Lanthanide-based luminescence nanothermometers may exploit not only downshifting, but also upconversion (UC) mechanisms. UC-based nanothermometers are interesting for biological applications: they efficiently convert near-infrared radiation to visible light, allowing local temperatures to be determined through spectroscopic investigation. Here, we have synthesized highly crystalline Er3+, Yb3+ co-doped upconverting KGd3F10 nanoparticles (NPs) by the EDTA-assisted hydrothermal method. We characterized the structure and morphology of the obtained NPs by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and dynamic light scattering. Nonlinear spectroscopic studies with the Er3+, Yb3+: KGd3F10 powder showed intense green and red emissions under excitation at 980 and 1,550 nm. Two- and three-photon processes were attributed to the UC mechanisms under excitation at 980 and 1,550 nm. Strong NIR emission centered at 1,530 nm occurred under low 980-nm power densities. Single NPs presented strong green and red emissions under continuous wave excitation at 975.5 nm, so we evaluated their use as primary nanothermometers by employing the Luminescence Intensity Ratio technique. We determined the temperature felt by the dried NPs by integrating the intensity ratio between the thermally coupled 2H11/2→4I15/2 and 4S3/2→4I15/2 levels of Er3+ ions in the colloidal phase and at the single NP level. The best thermal sensitivity of a single Er3+, Yb3+: KGd3F10 NP was 1.17% at the single NP level for the dry state at 300 K, indicating potential application of this material as accurate nanothermometer in the thermal range of biological interest. To the best of our knowledge, this is the first promising thermometry based on single KGd3F10 particles, with potential use as biomarkers in the NIR-II region.

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„Light-Responsive Porous Aromatic Frameworks: Generation of Photon Upconverted Emission and Modulation of Porosity by Bulk Photoisomerization“. Proceedings International 2, Nr. 2 (27.09.2020): 36–37. http://dx.doi.org/10.33263/proceedings22.036037.

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Porous aromatic frameworks (PAFs) were engineered to generate solid-state upconverting materials that emit higher energy photons under a suitable light stimulus [1]. Fluorescent PAFs were generated by the inclusion of diphenylanthracene moieties in a low-density 3D porous frameworks that maintained the optical properties of the emitting chromophores in the solid-state. Upon inclusion of a suitable sensitizer (a metallo-porphyrin) inside the nanometer-sized pores, the copolymer displayed sensitized photon upconversion with a quantum yield as high as 15%, a record value for solid-state materials. Moreover, it was possible to tether the sensitizer to the porous matrix through a stable covalent bond, generating self-standing upconverting nanoparticles that can be possibly applied in photovoltaics and bio-imaging. PAFs can also be engineered as light-responsive materials. The co-polymerization of a photoswitch with tetraphenylmethane generated porous networks that provided the free volume for the photoisomerization of the overcrowded alkene [2]. Under UV light irradiation, the quantitative photoisomerization led to structural changes and modulated the CO2 adsorptive properties of the material. The process is reversible by irradiation or heating leading to a cyclable material.

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Han, Sanyang, Zhigao Yi, Jiangbin Zhang, Qifei Gu, Liangliang Liang, Xian Qin, Jiahui Xu et al. „Photon upconversion through triplet exciton-mediated energy relay“. Nature Communications 12, Nr. 1 (17.06.2021). http://dx.doi.org/10.1038/s41467-021-23967-3.

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AbstractExploration of upconversion luminescence from lanthanide emitters through energy migration has profound implications for fundamental research and technology development. However, energy migration-mediated upconversion requires stringent experimental conditions, such as high power excitation and special migratory ions in the host lattice, imposing selection constraints on lanthanide emitters. Here we demonstrate photon upconversion of diverse lanthanide emitters by harnessing triplet exciton-mediated energy relay. Compared with gadolinium-based systems, this energy relay is less dependent on excitation power and enhances the emission intensity of Tb3+ by 158-fold. Mechanistic investigations reveal that emission enhancement is attributable to strong coupling between lanthanides and surface molecules, which enables fast triplet generation (<100 ps) and subsequent near-unity triplet transfer efficiency from surface ligands to lanthanides. Moreover, the energy relay approach supports long-distance energy transfer and allows upconversion modulation in microstructures. These findings enhance fundamental understanding of energy transfer at molecule-nanoparticle interfaces and open exciting avenues for developing hybrid, high-performance optical materials.

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Alexandrov, Alexander A., Mariya N. Mayakova, Valery V. Voronov, Daria V. Pominova, Sergey V. Kuznetsov, Alexander E. Baranchikov, Vladimir K. Ivanov, Elena I. Lysakova und Pavel P. Fedorov. „Синтез ап-конверсионных люминофоров на основе фторида кальция“. Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 22, Nr. 1 (20.03.2020). http://dx.doi.org/10.17308/kcmf.2020.22/2524.

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Исследование посвящено созданию люминофора на основе фторида кальция, легированного редкоземельными элементами: 5% Yb, 1% Er, с использованием методики синтеза из раствора в расплаве. В качестве растворителя использован нитрат натрия NaNO3, в качестве фторирующего агента – фторид натрия NaF. Полученные образцы охарактеризованы методами рентгенофазового анализа, рентгеноспектрального микроанализа, растровой электронной микроскопии и люминесцентной спектроскопии.В ходе работы исследовано влияние параметров синтеза на фазовый состав и морфологию частиц. Было установлено, что для формирования однофазных образцов – твёрдых растворов на основе фторида кальция – необходимо проводить синтез при температуре не ниже 400 °C, оптимальное время выдержки составило 3 ч. Установлен состав полученных образцов, он отличается от номинального и может быть записан как Ca0.88(Yb, Er)0.06Na0.06F2. Показано, что совместное вхождение натрия и ионов редкоземельных элементов повышает границы растворимости фториданатрия во фториде кальция. Энергетический выход люминесценции составил 1.21 %.По результатам работы был получен новый материал, обладающий ап-конверсионными свойствами. ЛИТЕРАТУРА Овсянкин В.В., Феофилов П.П. О механизме суммирования электронных возбуждений в акти-вированных кристаллах. Письма в ЖЭТФ. 1966;3(12):494–497. Режим доступа: http://www.jetpletters.ac.ru/ps/782/article_12079.pdf Auzel F. Compteur quantique par transfert d’energie entre deux ions de terres rares dans un tungstate mixte et dans un verre. C. R. Acad. Sci. B. 1966;262: 1016–1019. Fedorov P. P., Kuznetsov S. V., Osiko V. V. Elaboration of nanofl uorides and ceramics for optical and laser applications. In: Tressaud A., Poeppelmeier K. (eds.) Photonic and electronic properties of fl uoride materials: Progress in fl uorine science series. Amsterdam: Elsevier; 2016. p. 7–31. DOI: http://doi.org/10.1016/B978-0-12-801639-8.00002-7 Kostiv U., Rajsiglova L., Luptakova D., Pluhacek T., Vannucci L., Havlicek V., Engstova H., Jirak D., Slouf M., Makovicky P., Sedlacek R., Horak D. Biodistribution of upconversion/magnetic silica-coated NaGdF4:Yb3+/Er3+ nanoparticles in mouse models. RSC Adv. 2017;7: 45997–46006. DOI: https://doi.org/10.1039/c7ra08712h Zhao J., Zhu Y.-J., Chen F. Microwave-assisted solvothermal synthesis and upconversion luminescence of CaF2:Yb3+/Er3+ nanocrystals. J. Colloid Interface Sci. 2015;440: 39–45. DOI: http://doi.org/10.1016/j.jcis.2014.10.031 Rakov N., Maciel G. S., Xiao M. Upconversion fl uorescence and its thermometric sensitivity of Er3+: Yb3+ co-doped SrF2 powders prepared by combustion synthesis. Electron. Mater. Lett. 2014;10(5): 985–989. DOI: https://doi.org/10.1007/s13391-014-4030-9 Zhiping Z., Yingsen Y., Quamin S., Xiaotang L., Bingfu L., Yun Y. Preparation and characterization of CaF2:Yb3+, Er3+ up-conversion phosphor. Sci. Adv. Mater. 2017;9(3-4): 523–527. DOI: https://doi.org/10.1166/sam.2017.2334 Вахренёв Р. Г., Маякова М. Н., Кузнецов С. В., Рябова А. В., Поминова Д. В., Воронов В. В., Фёдоров П. П. Исследование синтеза и люминесцентных характеристик фторида кальция, легированного иттербием и эрбием, для биомедицинских приложений. Конденсированные среды и межфазные границы. 2016;18(4): 487–493. Режим доступа: https://journals.vsu.ru/kcmf/article/view/157 Yu. S., Zhi Y., Su H. Hydrothermal synthesis and upconversion properties of CaF2:Er3+/Yb3+ nanocrystals. J. Nanosci. Nanotechnol. 2014;14: 3380–3386. DOI: https://doi.org/10.1166/jnn.2014.7991 Ansaru A. A., Yadav R., Rai S. B. Physiochemical properties of greatly enhanced photoluminescence of aqueous dispersible upconversion CaF2:Yb/Ernanoparticles. Photochem. Photobiol. Sci. 2017;16: 890–896. DOI: https://doi.org/10.1039/c6pp00448b Rehmer A., Scheurell K., Kemnitz E. Formation of nanoscopic CaF2 via a fl uorolytic sol-gel process for antireflective coatings. J. Mater. Chem. C. 2015;3: 1716–1723. DOI: http://doi.org/10.1039/c4tc02510e Ritter B., Krahl T., Scholz G., Kemnitz E. Local Structures of Solid Solutions Sr1–xYxF2+x (x = 0...0.5) with fluorite structure prepared by sol-gel and mechanochemical syntheses. J. Phys. Chem. C. 2016;120(16): 8992–8999. DOI: http://doi.org/10.1021/acs.jpcc.6b01834 Fedorov P. P., Mayakova M. N., Аlexandrov А.А., Voronov V. V., Kuznetsov S. V., Baranchikov A. E., Ivanov V. K. The melt of sodium nitrate as a new medium for synthesis of fl uorides. Inorganics. 2018;6: 38. DOI: https://doi.org/10.3390/inorganics6020038 Ha J.-W., Sohn E.-H., Park I. J., Lee S.-B. Preparation of CaF2 microspheres by thermal decomposition of trifl uoroacetate precursor in molten salt medium. Mater. Lett. 2017;209: 357–359. DOI: http://doi.org/10.1016/j.matlet.2017.08.029 Chen C., Sun L.-D., Li Z.-X., Li L.-L., Zhung J., Zhang Y.-W., Yan C.-H. Ionic liquid-based route to spherical NaYF4 nanoclusters with the assistance of microwave radiation and their multicolor upconversion luminescence. Langmuir. 2010;26(11): 8797–8803. DOI: http://doi.org/10.1021/la904545a Guo H., Guo Y., Noh H. M., Moon B. K., Park S. H., Jeong J. H., Kim K. H. Elaboration, structure and luminescence of sphere-like CaF2:RE sub-microparticles by ionic liquids based hydrothermal process. J. Nanosci. Nanotechnol. 2016;16: 1146–1150. DOI: https://doi.org/10.1166/jnn.2016.10800 Deng X., Dai Y., Liu J., Zhou Y., Ma P., Cheng Z., Chen Y., Deng K., Li X., Hou Z., Li C., Lin J. Multifunctional hollow CaF2:Yb3+/Er3+/Mn2+-poly(2-Aminoethyl methacrylate) microspheres for Pt(IV) pro-drug delivery and tri-modal imaging. Biomaterials. 2015;50: 154–163. DOI: https://doi.org/10.1016/j.biomaterials.2015.01.040 Liang L., Liu Y., Bu C., Guo L., Sun W., Nuang N., Peng T., Sebo B., Pan M., Liu W., Guo S., Zhao X.-Z. Highly uniform, bifunctional core/double shell structured b-NaYF4:Er3+, Yb3+ @ SiO2@TiO2 hexagonal sub microprisms for high performance dye sensitized solar cells. Adv. Mater. 2013;25: 2174–2180. DOI: https://doi.org/10.1002/adma.201204847 Balabhadra S., Debasu M. L., Brites C. D. S., Ferreira R. A. S. Upconverting nanoparticles working as primary thermometers in different media. J. Phys. Chem. C. 2017;121: 13962–13968. DOI: https://doi.org/10.1021/acs.jpcc.7b04827 Рожнова Ю. А., Кузнецов С. В., Воронов В. В., Федоров П. П. Cинтез ап-конверсионных люминофоров на основе фторида стронция, легированного Ho3+ и Er3+, для визуализаторов двухмикронного излучения. Конденсированные среды и межфазные границы. 2016;18(3): 408–413. Режим доступа: https://journals.vsu.ru/kcmf/article/view/150 Rozhnova Yu. A., Luginina A. A., Voronov V. V., Ermakov R. P., Kuznetsov S. V., Ryabova A. V., Pominova D. V., Arbenina V. V., Osiko V. V., Fedorov P. P. White light luminophores based on Yb3+/Er3+/Tm3+- coactivated strontium fl uoride powders. Mater. Chem. Phys. 2014;148: 201–207. DOI: https://doi.org/10.1016/j.matchemphys.2014.07.032 Kuznetsov S., Ermakova Yu., Voronov V., Fedorov P., Busko D., Howard I. A., Richards B. S., Turshatov A. Up-conversion quantum yields of SrF2: Yb3+, Er3+ sub-micron particles prepared by precipitation from aqueous solution. J. Mater. Chem. C. 2018;6: 598–604. DOI: https://doi.org/10.1039/c7tc04913g Yasyrkina D. S., Kuznetsov S. V., Ryabova A. V., Pominova D. V., Voronov V. V., Ermakov R.P., Fedorov P. P. Dependence of quantum yield of up-conversion luminescence on the composition of fl uorite-type solid solution NaY1–x–yYbxEryF4. Nanosystems: physics, chemistry, mathematics. 2013;4(5): 648–656. 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