Article
Materials Science, Multidisciplinary
Jamin L. B. Martin, Lily F. Williams, Michael F. Reid, Jon-Paul R. Wells
Summary: Lanthanide-doped Y2SiO5 microcrystals were synthesized using solution combustion, solid state, and sol-gel methods. The sol-gel technique produced the most reliable and high-quality X2 phase Y2SiO5 microcrystals. Optical measurements of Nd3+, Eu3+, and Er3+ doped samples at cryogenic temperatures showed that the as-grown microcrystals had high optical quality with optical linewidths similar to bulk crystals at similar dopant concentrations.
Article
Chemistry, Physical
Aylin M. Deliormanli, Begum Rahman, Sibel Oguzlar, Merve Zeyrek Ongun
Summary: Nowadays fluorescent biomaterials have gained significant attention in biomedical research. In this study, Dy3+ and Dy:Eu3+ co-doped bioactive glass powders were synthesized and characterized. The structural, morphological, and photoluminescence properties of the powders were investigated in detail. In vitro experiments showed that the incorporation of Dy3+ enhanced hydroxyapatite deposition, while Dy:Eu3+ co-doping slightly decreased the bioactivity. Drug-loaded bioactive glass powders exhibited sustained drug release behavior. The findings of this study are valuable for understanding the degradation, hydroxyapatite conversion, and drug delivery of bioactive glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Shijie Li, Kai Ma, Yucheng Ye, Wenhan Han, Sihui Li, Yuting Shi, Ya Tang, Gang Cheng, Xinghua Zhu, Jianqi Qi
Summary: Through vacuum sintering, Erbium-doped Y2Zr2O7 transparent ceramics were successfully fabricated. The relationship between annealing temperature and sample structure was investigated, revealing the impact of oxygen vacancy. The annealing temperature significantly influenced the structure and optical properties of the ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
F. C. B. Martins, E. Firmino, L. S. Oliveira, N. O. Dantas, A. C. Almeida Silva, H. P. Barbosa, T. K. L. Rezende, M. Sousa Goes, M. A. Coutos dos Santos, L. F. Cappa de Oliveira, J. L. Ferrari
Summary: The Eu3+ and Gd3+ doped Y2O3 nanomaterials, prepared by coprecipitation at room temperature, exhibit a reddish color under UV excitation and high intrinsic quantum yield. These materials are of great importance for technological development as they are more energy efficient and have longer lifetimes compared to traditional light-emitting materials (fluorescent).
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Ceramics
Weijuan Zhang, Shuzhen Li, Ying Sha, Jinyan Xie, Wenjie Liu, Yi Feng
Summary: Transparent Eu3+-doped oxyapatite glass ceramics were prepared and their crystallization behavior and optical properties were investigated. The results showed that the Eu2O3 dopant affected the crystallization behavior and promoted the oxidation of Eu2+ to Eu3+. In addition, the oxyapatite glass ceramics exhibited excellent thermal stability, making them potential candidates for light conversion applications.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Ceramics
Abuzer Acikgoz, Gokhan Ceyhan, Bulent Aktas, Serife Yalcin, Gokhan Demircan
Summary: In this study, natural volcanic Obsidian glass doped with different concentrations of Er2O3 was investigated for its physical, structural, and mechanical properties. The addition of Er2O3 increased the luminescent and fracture toughness of the glasses, indicating improvements in their optical and mechanical characteristics.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Priscila B. Almeida, Ivo M. Pinatti, Regiane C. de Oliveira, Mayara M. Teixeira, Clayane C. Santos, Thales R. Machado, Elson Longo, Ieda L. Rosa
Summary: In this study, beta-Ag(2-3x)EuxMoO4 materials were prepared using coprecipitation method and investigated. The insertion of Eu3+ ions caused structural, morphological, and optical changes in the material, affecting its emission and excitation spectra. The results suggest that beta-Ag2MoO4 can sensitize and stabilize the red emission of Eu3+ ions.
Article
Chemistry, Physical
Purevdulam Namkhai, Kiwan Jang
Summary: Co-doping with R+ ions can enhance the emission intensity of BaSiO3:Eu3+, but has different effects on Eu2+ emissions. Co-doping with La3+ can increase the emission intensity of Eu2+, while other co-doping ions decrease it.
Article
Optics
V. A. Pustovarov, M. S. Tarasenko, D. A. Tavrunov, N. G. Naumov
Summary: The optical properties of Ce+3 doped CsLaSiS4 single crystals were investigated, and it was found that the emission band of Ce+3 ions and defect-related luminescence can be excited by different mechanisms. New emission bands appeared at low temperature, corresponding to the luminescence of self-trapped excitons and defect-related luminescence.
JOURNAL OF LUMINESCENCE
(2024)
Article
Polymer Science
Lijun Gao, Liuyang Li, Yunqiu Li, Congcong He, Liming Zhou, Xiongwei Qu, Shaoming Fang
Summary: A europium complex with double bonds was synthesized using crotonic acid as the ligand and europium ion as the center ion. The complex was then added to synthesized poly(urethane-acrylate) macromonomers to prepare bonded polyurethane-europium materials. These materials exhibited high transparency, thermal stability, and fluorescence, with higher storage moduli compared to pure polyurethane. The polyurethane-europium materials emitted bright red light with good monochromaticity, and the luminescence intensity increased with the europium complex content. Furthermore, the materials had a long luminescence lifetime, making them potential candidates for optical display instruments.
Article
Chemistry, Physical
Bingjie Zhong, Chengyang Zuo, Chao Yang, Shilin Yang, Yun Li, Hongtao Yu, Xianhua Wei
Summary: Rare-earth ion Eu3+ was doped into SrTiO3 ceramic to enhance its dielectric energy storage properties and act as luminescence centres. The doped ceramic exhibited higher breakdown strength and recoverable energy density compared to the undoped sample, with improvements of about 22% and 58%, respectively. In addition, the europium-doped ceramic capacitor demonstrated excellent power density and characteristic red photoluminescence.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Smriti Bhatia, Ruby Priya, Dinesh Kumar, Sanjay Upadhyay, Om Prakash Pandey
Summary: Europium-doped and titanium co-doped SrY2O4:Eu phosphors were successfully synthesized using solid-state reaction method. The synthesized samples were characterized for structural, morphological, functional group, and photoluminescence studies. The results showed that the properties of the samples, such as morphology, structure, and photoluminescence intensity, varied under specific doping conditions. The synthesized phosphors have potential applications in optoelectronics and display devices.
Article
Polymer Science
Fei Gao, Xinyu Zhao, Jinglin Liu
Summary: Europium trivalent ion (Eu3+)-doped silica nanowires were prepared and the positioning of Eu3+ in the silicon dioxide nanowire matrix was investigated. The results indicate that Eu3+ was successfully doped into amorphous silica and exhibited high photoluminescent emission in the silica matrix.
Article
Engineering, Electrical & Electronic
P. Vani, G. Vinitha, N. Manikandan
Summary: Investigation on the linear and nonlinear optical properties of thermally stable erbium-doped barium tellurite glasses was conducted. The concentration of erbium was found to have significant effects on the properties, with structural changes related to the formation of non-bridging oxygen atoms. Non-monotonic changes in the properties indicated the network breaking and void filling ability of rare earth ions. The need for suitable compositional tunability to achieve maximum output at appropriate erbium doping levels was highlighted. The glasses showed reverse saturable absorption phenomena and high optical nonlinearity, making them effective as optical limiting materials.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Artem O. Larin, Liliia N. Dvoretckaia, Alexey M. Mozharov, Ivan S. Mukhin, Artem B. Cherepakhin, Ivan I. Shishkin, Eduard I. Ageev, Dmitry A. Zuev
Summary: This study presents a novel method for fabricating security labels based on erbium-doped silicon, with photoluminescent regions formed by selective femtosecond laser irradiation. The technique involves creating stable photoluminescence at 1530 nm through laser-induced heating and offers two types of anti-counterfeiting labels: one with direct laser writing for luminescent areas, and another with additional fabrication steps for higher security. This scalable approach is promising for labeling goods, securities, and luxury items.
ADVANCED MATERIALS
(2021)
Article
Physics, Applied
Yasushi Nanai, Yousuke Suzuki, Tsuyoshi Okuno
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2016)
Article
Physics, Applied
Yasushi Nanai, Hayato Kamioka, Tsuyoshi Okuno
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2018)
Article
Engineering, Electrical & Electronic
Shingo Fuchi, Takayoshi Sato, Mikiya Idei, Yuuki Akiyama, Yasushi Nanai
JOURNAL OF ELECTRONIC MATERIALS
(2019)
Article
Physics, Applied
Yasushi Nanai, Ryota Ishida, Yuki Urabe, Seiya Nishimura, Shingo Fuchi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Physics, Applied
Yuki Tamura, Tsuyoshi Okuno, Yoriko Suda, Yasushi Nanai
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Seiya Nishimura, Echika Isobe, Yasushi Nanai, Shinji Koh, Shingo Fuchi
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Optics
Seiya Shimono, Koki Yoshimoto, Yuta Ueda, Yasushi Nanai, Hiroaki Kishimura, Atsushi Aruga
Summary: The study on Eu2+ substituted pollucite phosphors revealed that the emission spectra color shifts from bright blue to bright blue-green with increasing Eu2+ substitution. This tunable luminescence color is attributed to the crystal field splitting effect of Eu2+ ions and vacancies at Cs sites caused by the substitution.
JOURNAL OF LUMINESCENCE
(2021)
Article
Engineering, Electrical & Electronic
Seiya Nishimura, Yasushi Nanai, Shinji Koh, Shingo Fuchi
Summary: By synthesizing Tm2O3-doped glass phosphors using a melt-quenching method, a new near-infrared wideband light-source was successfully created with distinctive luminescence properties. The luminescence spectra around 800 and 1200 nm were observed using blue LED excitation, showing shifts and intensity changes with increasing Tm2O3 concentration, likely due to self-absorption and cross-relaxation phenomena.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Applied
Yoriko Suda, Yuki Tamura, Syota Yamaguchi, Yasushi Nanai, Tsuyoshi Okuno
Summary: CaS:Eu2+, Tm3+ is a phosphor that emits a long afterglow of red emission when excited by blue light. The emission mechanism of this afterglow is studied using time-resolved fluorescence spectroscopy, with important levels only observable at low temperatures impacting the emission characteristics at room temperature.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Kosuke Oiwa, Yusuke Ozawa, Kent Nagumo, Seiya Nishimura, Yasushi Nanai, Akio Nozawa
Summary: The research team developed a technology using NIR wideband LEDs for remote blood pressure estimation, aiming to improve accuracy through analyzing facial image features. The study found that the root mean square error between the measured and estimated MBP using NIR wideband LEDs was around 4 mmHg in two out of three subjects.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Seiya Shimono, Taichi Izaki, Nagisa Tanaka, Yasushi Nanai, Takaaki Morimoto, Hiroaki Kishimura, Atsushi Aruga
Summary: Green-emitting Tb3+-doped pollucite (Cs1-3xTbx)AlSi2O6 phosphors were successfully synthesized with the optimum doping concentration of x = 0.07 and a quantum efficiency of 83.6%. The emission intensity retention at elevated temperatures for x = 0.07 was found to be 92.7% at 400 K and 78.4% at 500 K, indicating their potential for applications in UV-C excited white light-emitting diodes.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Physics, Applied
Syota Yamaguchi, Yoriko Suda, Yasushi Nanai, Tsuyoshi Okuno
Summary: This study investigates the effect of Dy3+ ions, alkali metal ions, and Cl- ions doping on the afterglow and photostimulation of CaS:Eu2+ phosphors. It is found that Dy3+ ions and alkali metal ions induce different types of defects and enhance the afterglow independently, while Cl- ions doping enhances the photostimulation by IR excitation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Mayuko Nakagawa, Kosuke Oiwa, Yasushi Nanai, Kent Nagumo, Akio Nozawa
Summary: The study focuses on remote blood glucose estimation using multiwavelength facial imaging. Features related to blood glucose variation were extracted from visible, near-infrared, and infrared facial images, and their accuracy in estimating blood glucose levels was evaluated. The results showed that near-infrared images had higher accuracy in estimating blood glucose levels. Further research suggests increasing the amount of data and searching for specific wavelength bands suitable for blood glucose level monitoring to improve the accuracy of this method.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
Yasushi Nanai, Yutaro Satake, Nobuaki Kitazawa
Summary: We fabricated novel 0.1Cr(2)O(3)-25CaO-75GeO(2) glass and glass ceramics with wideband NIR luminescence and investigated the annealing temperature dependence on the photoluminescence (PL) properties for NIR phosphor applications. The anisotropic growth of Ca2Ge7O16 nanocrystals during annealing was confirmed, leading to variations in body colors and diffuse reflectance spectra due to changes in the valence of Cr ions and their coordination environments. The as-made glass showed broadband luminescence from 700-1300 nm attributed to the T-4(2) & RARR; (4)A(2) transition of Cr3+. Upon crystallization of Ca2Ge7O16 through heat treatment, the peak wavelength shifted to 780 nm and line-shaped E-2 & RARR; (4)A(2) emission appeared. The PL quantum yield reached a maximum of 0.19 at an annealing temperature of 775°C, and the dependence on annealing temperature could be explained by changes in PL lifetimes and diffuse reflectance spectra.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Y. Nanai, A. Igarashi, H. Kamioka
12TH INTERNATIONAL CONFERENCE ON EXCITONIC AND PHOTONIC PROCESSES IN CONDENSED MATTER AND NANO MATERIALS (EXCON 2018)
(2019)
