Article
Optics
Leonid Yu Mironov, Elena Kolobkova
Summary: A series of new fluorophosphate glasses with varying concentrations of Yb3+ ions were synthesized and characterized through absorption, luminescence, and luminescence kinetics measurements, while potential laser performance parameters were calculated, such as pump saturation and minimum fraction of excited ions needed for gain balance.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Laura Stein, Cui Wang, Christoph Foerster, Ute Resch-Genger, Katja Heinze
Summary: Chromium (III) complexes exhibit phosphorescence under anaerobic conditions but are quenched in the presence of oxygen. This study explores the use of sterically demanding ligands to shield the chromium (III) center from oxygen, enabling luminescence applications of these complexes under aerobic conditions. Optimal sterically shielded complexes showed high photoluminescence quantum yields and longer excited state lifetimes, demonstrating the potential of this ligand design approach.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Sheng Mei, Jiajia Zhou, Hong-Tao Sun, Yangjian Cai, Ling-Dong Sun, Dayong Jin, Chun-Hua Yan
Summary: This study reveals the formation of an energy-migration network by highly doping Yb3+ ions within the nanocrystal host, and the distinct behavior of Yb3+ in the networking state. The reversible effect of Yb-O coordination on luminescent properties of nanocrystals is demonstrated, providing important insights for the application and manipulation of nanomaterials.
Article
Chemistry, Multidisciplinary
Han Li, Oliver S. Wenger
Summary: Our study demonstrates the concept that single excitation of the two-electron reduced forms of perylene diimides (PDIs) with green photons can produce excited states with similar or greater reducing power than the shorter-lived excited states of PDI radical monoanions. By performing multi-electron reduction of a photocatalyst with a sacrificial reagent before irradiation with low-energy photons, we can generate highly reactive excited states for photocatalytic reactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Simon Wheeler, Colum Breen, Yong Li, Sarah H. Hewitt, Erin Robertson, Edwin A. Yates, Igor L. Barsukov, David G. Fernig, Stephen J. Butler
Summary: Sulfotransferases are a class of enzymes that are poorly understood due to the lack of convenient screening tools. A europium(iii)-based probe has been developed for assessing sulfotransferase activity, allowing for the first direct real-time assay of heparan sulfate sulfotransferase. The probe shows selective response towards PAP and can be used for simple inhibitor screening.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2022)
Article
Engineering, Biomedical
Ying Zhang, Wei Zhang, Xiaona Zhang, Yu Zhou
Summary: In this study, erbium-and ytterbium-containing mesoporous bioactive glass microspheres (MBGs: Er/Yb) with blue and red emission at an excitation wavelength of 980 nm were synthesized. The optimal molar ratio of Er3+/Yb3+ was determined to be 4:3 based on in vitro bioactivity tests. MBGs:4Er/3Yb showed potential applications in biomineralization and drug release monitoring.
ACTA BIOMATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Narayan Sinha, Juan-Ramon Jimenez, Bjorn Pfund, Alessandro Prescimone, Claude Piguet, Oliver S. Wenger
Summary: By combining pi-donating amido with pi-accepting pyridine coordination units in a tridentate chelate ligand, a strong nephelauxetic effect was achieved in a homoleptic Cr-III complex, shifting its luminescence to the NIR-II spectral range. This study focuses on increasing metal-ligand bond covalence to shift the ruby-like E-2 emission of Cr-III to 1067 nm at 77 K, taking a fundamentally different approach from previous ligand design strategies.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Applied
Mikhail T. Metlin, Dmitry O. Goryachii, Denis F. Aminev, Nikolay P. Datskevich, Vladislav M. Korshunov, Daria A. Metlina, Alexander A. Pavlov, Lyudmila Mikhalchenko, Mikhail A. Kiskin, Veronika V. Garaeva, Ilya Taydakov
Summary: A series of new Yb3+ and Gd3+ complexes were synthesized and characterized for their potential use as emitters in multilayer OLEDs, with [Yb(2-Naph)(3)(phen)] showing unusually high electroluminescence quantum efficiency. Detailed information about the energy transfer process in this system was revealed through TD-DFT calculations and experimental results.
Article
Chemistry, Multidisciplinary
Junbo Li, Xuepu Wang, Xiaoya Zhao, Xuefeng Chen, Shuhui Ding, Minjian Wu, Kaka Zhang
Summary: In this study, a simple and straightforward cascade reaction was reported to synthesize BF(2)bdk compounds with different functional groups. With the assistance of suitable organic matrices, these compounds can exhibit organic room-temperature phosphorescence with long lifetimes and intense afterglow, showing excellent performance in the fabrication of processable red afterglow materials.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
H. Nalumaga, J. J. Schuyt, R. D. Breukers, G. V. M. Williams
Summary: Strained cuboid Yb-doped NaMgF3 nanoparticles were synthesized using a hydrothermal synthesis technique, showing consistent morphologies and crystal phases for different Yb concentrations. Photoluminescence was observed from O2- impurities, Yb3+, and Yb2+ before X-ray exposure, with Yb3+ luminescence being excited by ultraviolet stimulation through a charge transfer process. After X-ray exposure, the Yb2+ luminescence intensity increased due to the conversion of Yb3+ to Yb2+ by radiation, suggesting the potential application of this radiophotoluminescence effect in radiation dose detection and monitoring.
MATERIALS RESEARCH BULLETIN
(2022)
Review
Chemistry, Multidisciplinary
Narayan Sinha, Polina Yaltseva, Oliver S. Wenger
Summary: The nephelauxetic effect, which refers to the expansion of d-orbitals as a result of metal-ligand bond covalence, has been recognized for its importance in the design of new photoactive complexes using first-row transition metals. This effect can significantly impact the photophysical properties of 3d metal complexes in solution at room temperature. By exploiting the nephelauxetic effect, red luminescence in Cr-III and Mn-IV complexes has been shifted to the near-infrared spectral region, while charge-transfer excited states in Fe-II and Co-III complexes have been stabilized, improving their properties and application potential.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Ceramics
Elena Gorokhova, Olga Dymshits, Ivan Venevtsev, Liza Basyrova, Irina Alekseeva, Alexander Khubetsov, Mikhail Baranov, Marina Tsenter, Aleksander Zhilin, Sergey Eron'ko, Eugenia Oreschenko, Faina Muktepavela, Karlis Kundzins, Pavel Loiko
Summary: In this study, zinc oxide optical ceramics containing 0-2 wt% ytterbium were prepared, with Yb2O3 acting as an inhibitor for ZnO grain growth. The ceramics exhibit transmittance up to 60% in the visible region and their infrared transmission is determined by free charge carrier absorption. Additionally, under X-ray excitation, intense luminescence bands are observed in the blue and green regions, with Yb2O3 causing a redistribution of luminescence intensity and faster emission decay.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Augusto Anselmo Amaro, Guilherme Rodrigues da Silva Mattos, Marcos Vinicius de Morais Nishimura, Jessica Dipold, Niklaus Ursus Wetter, Luciana Reyes Pires Kassab
Summary: This study investigates the optical properties of GeO2-PbO glasses doped with Yb3+ ions and Ag nanoclusters (NCs) produced through the melt-quenching technique. The lack of research on the energy transfer between these species in these glasses motivated this study. Tunable visible emission, ranging from blue to orange, was observed depending on the Yb3+ concentration, which affects the size of the Ag NCs. The transfer of energy from Ag NCs to Yb3+ ions was attributed to a decay mechanism and was supported by changes in lifetimes and photoluminescence measurements.
Article
Chemistry, Multidisciplinary
Yuichi Kitagawa, Ayu Naito, Koji Fushimi, Yasuchika Hasegawa
Summary: This study demonstrates a tribo-excited chemical reaction using a stacked lanthanide coordination polymer, resulting in a chemical product different from that obtained by photo-oxidation. The tightly stacked structure with hydrogen bonding in the polymer was characterized by X-ray crystal structure analysis.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Laura Abad-Galan, Patrick Cieslik, Peter Comba, Michael Gast, Olivier Maury, Lucca Neupert, Amandine Roux, Hubert Wadepohl
Summary: Eu-III, Tb-III, Gd-III, and Yb-III complexes of the non-adentate bispidine derivative L-2 were successfully synthesized and their emission properties studied. X-ray crystallography revealed a common highly symmetrical coordination geometry enforced by the nonadentate ligand L-2, leading to long-lived excited states and high emission quantum yields. These complexes, with very high kinetic and thermodynamic stabilities, may serve as a basis for interesting biological probes.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
