Article
Chemistry, Applied
Ning Li, Haina Qi, Xiaohan Liu, Hong Shao, Dan Li, Wensheng Yu, Xiangting Dong
Summary: SrF2:Er3+/Yb3+ up-converting fluorescent unidimensional nanostructural materials, including nanofibres, nanostrips and hollow nanofibres, have been successfully designed and constructed through uniaxial electrospinning and bi-crucible fluorination technology. Control over the fabrication process allows for the realization of desired morphology and tunable fluorescence. The materials exhibit excellent up-converting fluorescence under excitation of a 980-nm laser, with bright green and weaker red emissions attributed to energy level transitions of Er3+ ions. The detailed fluorescent and formative mechanisms are expounded upon, with potential applications in various fields.
Article
Chemistry, Physical
Qixiao Wu, Zheng Xu, S. Wageh, Ahmed Al-Ghamdi, Suling Zhao
Summary: A series of NaYF4:Yb3+, Tm3+@NaYF4:Yb3+, Er3+ core@shell nanocrystals with different sensitizer contents were synthesized to investigate the impact of sensitizer Yb3+ on upconversion luminescence. The results showed that as the Yb3+ content increased, the green upconversion luminescence decayed faster than the red, and the red to green upconversion luminescence ratio significantly increased in samples highly doped with Yb3+.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Marta Quintanilla, Eva Hemmer, Jose Marques-Hueso, Shadi Rohani, Giacomo Lucchini, Miao Wang, Reza R. Zamani, Vladimir Roddatis, Adolfo Speghini, Bryce S. Richards, Fiorenzo Vetrone
Summary: The size and shape of nanoparticles have a significant impact on their photoluminescence quantum yield (PLQY). This study found that the distortion of the crystal lattice in nanoparticles smaller than 20 nm led to an increase in PLQY. Additionally, the shape of nanoparticles within the range of 20-60 nm was found to be particularly relevant for PLQY.
Article
Chemistry, Multidisciplinary
Pip C. J. Clark, Elina Andresen, Michael J. Sear, Marco Favaro, Leonardo Girardi, Roel van de Krol, Ute Resch-Genger, David E. Starr
Summary: The spatial distribution and concentration of lanthanide activator and sensitizer dopant ions play a crucial role in the luminescence properties of upconverting nanoparticles (UCNPs). In this study, X-ray photoelectron spectroscopy depth-profiling with tender X-rays was used to measure the distribution of Er3+ and Yb3+ ions in three types of UCNPs prepared using different synthesis methods. The results were combined with data simulations and inductively coupled plasma-optical emission spectroscopy measurements to construct models of the UCNPs' dopant ion distributions and understand their impact on the optical properties of UCNPs.
Article
Materials Science, Multidisciplinary
Jingxin Ding, Huazhen Liao, Libin Pang, Deping Wang, Song Ye
Summary: This study successfully synthesized core-shell up-conversion nanoparticles and found that they exhibit improved thermal sensitivity compared to core-only structured thermometers. The spectral study showed that the up-conversion luminescence intensity of the core-shell nanoparticles was significantly enhanced. The use of Stark-LIR techniques allowed for the calculation of the relative thermal sensitivity of the core-shell nanoparticles, with CS-4Er@1Gd showing the highest sensitivity.
Article
Optics
Bohan Lei, Liping Lu, Feng Hu, Lin Ning, Di Shao, Haiying Sun, Xiyan Zhang, Zhaohui Bai, Xiaoyun Mi
Summary: In this study, a up-conversion composite fluoride phosphor was successfully synthesized using the optimized low-temperature combustion synthesis method. The effects of Bi3+ ion introduction on phase formation and fluorescence intensity were systematically studied. The results show that introducing Bi3+ ions can enhance the fluorescence intensity, and the sample exhibits good temperature sensitivity, making it a promising material for temperature sensors.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Analytical
Jitender Kumar, Indrajit Roy
Summary: This paper introduces a hybrid organic-inorganic optical nanochemosensor for selective and ultrasensitive detection of Pb2+ ions based on energy transfer (ET). The method uses upconverting nanophosphors and a lead ion-sensitive fluorescent probe for detection, enabling sensitive and in-depth detection of Pb2+ ions in complex ecological and biological specimens.
Article
Optics
Kedar Sahoo, Sudhir Ranjan, Manoj Kumar
Summary: This study successfully synthesized NaYF4:Yb3+,Tm3+ upconverting phosphors with diverse morphology and enhanced luminescence intensity using a hydrothermal method. The research also revealed the important roles of substrates and chelating agents in the formation of upconverting phosphors with different shapes and crystallinity.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Xia Xu, Meirong Fu, Penghui Li, Min Yang
Summary: In this study, a pH-responsive upconversion fluorescence imaging-guided photothermal therapy system was successfully developed, which can avoid light damage to non-target tissues and achieve upconversion fluorescence imaging under specific pH conditions.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Preeti Verma, Debasish Sarkar, Parasmani Rajput, Manvendra Narayan Singh, Rajendra Sharma, Supratim Giri
Summary: This paper investigates the influence of non-lanthanide dopant insertion on the structural attributes of UC crystals through synchrotron-based X-ray probing, revealing that Li+ doping leads to variations in crystal structures without predictable effects on UCL intensity behavior. The study highlights the existence of local lattice disorder reflected in lattice strain, which correlates with changes in UCL intensity regardless of activator ions, indicating a perturbation of local symmetry field connected with local disorder not always manifested through average structural attributes like lattice parameters.
Article
Chemistry, Multidisciplinary
Karmel de Oliveira Lima, Luiz Fernando dos Santos, Rodrigo Galvao, Antonio Claudio Tedesco, Leonardo de Souza Menezes, Rogeria Rocha Goncalves
Summary: This study presents a highly sensitive and accurate luminescence nanothermometer based on cerium ions, showing potential application in biological settings.
FRONTIERS IN CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Xuezhu Sha, Hui Zheng, Baojiu Chen, Jinsu Zhang, Xiangping Li, Sai Xu, Jiashi Sun, Xizhen Zhang, Yongze Cao, Yanqiu Zhang, Xin Wang, Yuhang Zhang, Haiping Xia
Summary: This study synthesized core-shell nanoparticles with both photothermal conversion and temperature detection capabilities, finding that different coatings did not significantly affect their performance. The photothermal conversion capacity increased with higher Yb3+ concentration and 980 nm laser excitation power.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Wei Zhang, Yang Zang, Yanli Lu, Jinghui Han, Qingyun Xiong, Jinping Xiong
Summary: A novel near-infrared fluorescent-driven contrast agent was synthesized, which showed increased luminescence intensity of upconverted nanomaterial by doping with silver. The biocompatibility of the material was significantly improved by modification.
Article
Polymer Science
Zhaoxue Deng, Hongjian Wu, Huaijin Mu, Lipeng Jiang, Weiyan Xi, Xiaoxue Xu, Wei Zheng
Summary: This work successfully encapsulates up-conversion luminescent NaYF4 nanoparticles into PLGA-gelatin nanofibers using electrospinning technique. The morphology, emission spectra, hydrophilicity, mechanical properties, and degradation of the nanofibers are extensively studied. Results demonstrate that the nanofibers with an encapsulated content of 5 mg/ml exhibit the highest luminescent intensity and superior mechanical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
Manisha Prasad, Vineet Kumar Rai
Summary: This article presents the analysis of advanced Er3+/Yb3+: Na3Zr2(SiO4)(2)PO4 (NASICON) monoclinic phosphors prepared by solid state reaction technique as upconverting materials. The structural parameters, surface morphology, and optical characteristics of the synthesized phosphors are analyzed. The codoping of Yb3+ ions in the Er3+ doped phosphors exhibit fascinating results under 980 nm continuous wave diode laser excitation, which can be used for thermometry based on fluorescence intensity ratio (FIR).
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Ramin Ghiyasi, Milena Milich, John Tomko, Girish C. Tewari, Mika Lastusaari, Patrick E. Hopkins, Maarit Karppinen
Summary: ZnO thin films fabricated via atomic layer deposition process can simultaneously manipulate the electrical and thermal transport characteristics by elongating the N-2 purge time. This leads to increased carrier density and enhanced electrical conductivity, but may hinder thermal transport. This is of fundamental importance in thermoelectrics and desired in optics and microelectronics.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Pauline Colinet, Hannah Byron, Sami Vuori, Juha-Pekka Lehtio, Pekka Laukkanen, Ludo Van Goethem, Mika Lastusaari, Tangui Le Bahers
Summary: This study reports and compares the photochromic properties of three aluminosilicate natural minerals. An innovative experimental and computational approach is used to understand the origin of these properties. The stability of the colored form is found to be related to the motion of sodium atoms.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
A. Lemiere, A. Szczodra, S. Vuori, B. Bondzior, T. W. Hawkins, J. Ballato, M. Lastusaari, J. Massera, L. Petit
Summary: The first biophotonic composite fiber with green persistent luminescence was successfully prepared using commercial persistent luminescent microparticles and bioactive glass. The fibers exhibited green afterglow and maintained their bioactive response.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Materials Science, Ceramics
E. Santos Magalhaes, A. Sedda, B. Bondzior, S. Vuori, D. Van der Heggen, P. F. Smet, M. Lastusaari, L. Petit
Summary: In this paper, we demonstrated the fabrication of new phosphate-based composites with green persistent luminescence after being charged with near-infrared light using the direct doping method. The challenges related to the fabrication of such composites are discussed, including the need for intense blue up-conversion emission for charging the persistent luminescent phosphors and the requirement for the composites to remain translucent with limited light scattering for efficient charging.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
N. Garcia Arango, S. Vuori, H. Byron, D. Van der Heggen, P. F. Smet, M. Lastusaari, L. Petit
Summary: This study demonstrates the fabrication process of Yb3+, Tm3+ co-doped oxyfluorophosphate glass-based composites that exhibit green persistent luminescence when charged with near-infrared light. The mechanism behind the green afterglow and the optimization of up-conversion emission are investigated. The addition of SrAl2O4:Eu2+,Dy3+ crystals enhances the green afterglow effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Sami Vuori, Hannah Byron, Isabella Norrbo, Minnea Tuomisto, Mika Lastusaari
Summary: Hackmanite is an intelligent mineral that changes color in response to different types of radiation. This property can be utilized in various applications such as solar UV indexing, X-ray imaging, gamma radiation detection, and intelligent clothing. This study demonstrates the possibility of producing Hackmanite on an industrial scale, with a yield of up to 1 kg, making significant progress towards its commercial use. Additionally, a novel application of a photochromic photographic film that can be reused indefinitely is presented.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Physics, Applied
Masoud Ebrahimzadeh, Sami Vuori, Mikko Miettinen, Juha-Pekka Lehtio, Sari Granroth, Marko P. J. Punkkinen, Zahra Sadat Jahanshah Rad, Risto Punkkinen, Mikhail Kuzmin, Pekka Laukkanen, Mika Lastusaari, Kalevi Kokko
Summary: Properties of oxidized InP surfaces are important for developing passivation of III-V crystals. Exposure to NH3 or O-2 gas at low temperatures can modify InP native oxides. NH3 exposure increases photoluminescence intensity for n-InP crystals with native oxide, while O-2 exposure increases it for p-type InP crystals.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hannah Charlotte Byron, Claudia Swain, Pyry Paturi, Pauline Colinet, Raphael Rullan, Vesa Halava, Tangui Le Bahers, Mika Lastusaari
Summary: Photochromic sodalites have a wide range of potential applications, such as UV indexing and X-ray imaging, but further optimization is needed. UV indexing can be improved by adjusting the activation energy of coloration from 300 to 410 nm through replacing sulfur with selenium. By combining this method with others, the excitation threshold and photochromism color can be independently tuned. The absorption maxima range can be expanded to cover almost the entire visible spectrum. Mixing low-cost and easy-to-synthesize sodalites further expands the color possibilities and enables the development of a unique sodalite mix for quantifying two types of UV radiation doses simultaneously. Finally, highly tuned sodalites show promising response to X-rays, producing clear images with lower radiation doses than classic photochromic sodalite.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Matias Alvear, Christoph Schmidt, Ole Reinsdorf, Edgard Lebron-Rodrigez, Abdullah Al Abdulghani, Ive Hermans, Markus Peurla, Mika Lastusaari, Kari Eranen, Dmitry Yu. Murzin, Narendra Kumar, Tapio Salmi
Summary: Titanium silicates of MWW structures with different Si/Ti ratios were prepared via hydrothermal synthesis and showed high crystallinity and MWW-like platelet morphology. The synthesized Ti-MWW materials exhibited higher surface areas and partial meso-porosity compared to the commercial TS-1 catalyst. In propylene epoxidation, the Ti-MWW materials showed significantly higher catalytic activities and enhanced selectivities compared to TS-1.
Article
Materials Science, Multidisciplinary
Masoud Ebrahimzadeh, Sari Granroth, Sami Vuori, Marko Punkkinen, Mikko Miettinen, Risto Punkkinen, Mikhail Kuzmin, Pekka Laukkanen, Mika Lastusaari, Kalevi Kokko
Summary: Successful reduction of contact resistivity on p-InP crystals was achieved through wet-chemistry treatments and nanoscale control, improving the durability and conductivity of the devices.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Amr Ghazy, Mika Lastusaari, Maarit Karppinen
Summary: We have demonstrated the multiple roles of organic linkers in luminescent lanthanide-organic thin films grown using atomic/molecular layer deposition. The organic moieties not only provide mechanical flexibility and prevent concentration quenching but also enhance the lanthanide luminescence as efficient sensitizers. By introducing different nitrogen species into the aromatic rings, we have expanded the excitation wavelength range from UV to visible, expanding the potential applications of these photoluminescent thin films.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Amr Ghazy, Mika Lastusaari, Maarit Karppinen
Summary: Precisely composition-tuned lanthanide-organic thin films with white light emission are fabricated using ALD/MLD technique. The emission characteristics are comparable to or even better than those of commercial incandescent bulbs, fluorescent tubes, and LED lamps. The films consist of up to four lanthanide species and terephthalate as the organic linker, which not only provides mechanical flexibility and defines the distance between lanthanide ions but also exhibits UV/blue broad-band emission upon UV excitation. The emission energy is efficiently transferred to Er3+ ions, resulting in longer wavelength emission, while Tb and Eu contribute to green and red emissions, producing warm white light emission in the films. By controlling the distribution of Ln dopants using a three-layer composition, the emission intensity is increased fourfold.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Hannah Byron, Teppo Kreivila, Pauline Colinet, Tangui Le Bahers, Mika Lastusaari
Summary: The absorption energy of F-center in sodalite can be reduced by enlarging the unit cell with larger ions, changing the color from pink to blue. However, shifting the absorption to produce other colors is more difficult. This study demonstrates the preparation and characterization of sodalites displaying white-to-yellow photochromism. The materials are proposed to have a Na2Ca entity, which is responsible for the yellow color.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Chemical
Alua Manabayeva, Pa''ivi Maki-Arvela, Zuzana Vajglova, Mark Martinez-Klimov, Olha Yevdokimova, Anssi Peuronen, Mika Lastusaari, Teija Tirri, Kaisar Kassymkan, Tolkyn S. Baizhumanova, Manapkhan Zhumabek, Rabiga O. Sarsenova, Zauresh T. Zheksenbaeva, Gulnar N. Kaumenova, Vincenzo Russo, Dmitry Yu. Murzin, Svetlana A. Tungatarova
Summary: This study investigated the dry reforming of methane using Ni-M oxide catalysts prepared by solution combustion synthesis. The results showed that catalysts prepared by this method exhibited better catalytic activity and stability compared to those prepared by impregnation.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Sami Vuori, Pauline Colinet, Juha-Pekka Lehtio, Arnaud Lemiere, Isabella Norrbo, Micael Granstrom, Jari Konu, Goran Agren, Pekka Laukkanen, Laeticia Petit, Anu J. Airaksinen, Ludo van Goethem, Tangui Le Bahers, Mika Lastusaari
Summary: In this study, a sustainable solution for radiochromic detection is proposed using hackmanite, a natural intelligent material. Experimental evidence shows that hackmanite exhibits radiochromic properties when exposed to different particles and radiation, and the mechanism of gamma-induced radiochromism in hackmanite is elucidated using both experimental and computational data. Hackmanite can be used for gamma dose mapping in high dose applications and has the ability to remember earlier gamma exposure, making it a promising replacement for the currently available radiochromic films. It is also non-toxic and reusable.
MATERIALS HORIZONS
(2022)
