Article
Optics
Mateus Grecco Manfre, Rogeria Rocha Goncalves
Summary: The study investigated the influence of annealing temperature on the structural and luminescent properties of Nb2O5:Eu3+ and Nb2O5:Nd3+ nanostructured materials. It was found that higher annealing temperature resulted in a more ordered distribution of Eu3+ ions, while Nb2O5:Eu3+ nanoparticles annealed at intermediate temperature exhibited better luminescent performance and colloidal stability.
JOURNAL OF LUMINESCENCE
(2022)
Article
Biochemical Research Methods
Julio Tadashi Tanaka, Susane Bonamin Moscardini, Willian Euripedes do Nascimento Melo, Helena Brunckova, Eduardo Jose Nassar, Lucas Alonso Rocha
Summary: The research discusses the factors influencing the emergence of a single YVO4 tetragonal phase and the optimal Nd3+ concentration for improving the infrared emission properties of YVO4:Nd phosphors. Results showed that a V5+/Y3+ molar ratio of 1.48 was the best composition to avoid undesired phases, while a sample containing 3.0% Nd3+ and annealed at 1000 degrees C exhibited the best infrared emission properties.
JOURNAL OF FLUORESCENCE
(2021)
Article
Materials Science, Multidisciplinary
Salih Alper Akalin, Mustafa Erol, Begum Uzunbayir, Sibel Oguzlar, Serdar Yildirim
Summary: NiOx, Li:NiOx, and Li,Mg:NiOx powders were produced by sol-gel method, and their structural and optical properties were studied. XPS results confirmed the successful incorporation of Li+ and Mg2+ into NiOx structure, with decreased crystallite size as dopant concentration increased. Addition of Li+ and Mg2+ led to reduced emission intensity and average decay time compared to pristine NiOx.
Article
Chemistry, Multidisciplinary
Thomas Kisling, Robert Zimmerleiter, Lukas Roiser, Kristina Duswald, Markus Brandstetter, Christian Paulik, Klaus Bretterbauer
Summary: The sol-gel process is an effective method for preparing homogeneous structured nanomaterials, and its properties depend on experimental conditions. This study implemented near-infrared spectroscopy based on micro-optomechanical system technology in the sol-gel process of three silanes. The controlled reaction yielded a stable product with reproducible quality, fulfilling the requirements for coating processes.
Article
Optics
Vijay Singh, G. Lakshminarayana, Nimitha S. Prabhu, Sudha D. Kamath, N. Singh, Sara Ashraf
Summary: In this study, Sr2La8-x(SiO4)(6)O-2:xSm(3+) phosphors were successfully prepared via the sol-gel route and evaluated for their structural properties through FTIR spectroscopy and XRD measurements. The phosphors exhibited various stretching and bending vibrations of the SiO4 units, with an average crystallite size of about 38.8 nm. The optical properties were characterized by diffuse reflection spectroscopy and photoluminescence measurements, showing potential application in orange-red LEDs and red components of WLEDs.
Article
Materials Science, Multidisciplinary
Ching-Fu Lin, Chun-Hao Chang, Laurent Noel, Bor-Ran Li, Hsin-Fei Meng, Olivier Soppera, Hsiao-Wen Zan
Summary: In this work, a gold nanoparticles/indium-zinc-oxide nanocomposite visible photodetector is directly prepared by laser-annealing on a 3D-printed substrate. The photodetector is integrated with a 3D-printed sensing chamber to successfully detect the urea concentration in saliva samples from healthy and chronic kidney disease groups.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Applied
Lu Zhang, Bolin Zheng, Junyi Zhai, Tao Lin
Summary: In this study, rare earth-doped TiO2 thin films were fabricated by a sol-gel method and it was discovered that the addition of Sn element can significantly reduce the annealing temperature and enhance the photoluminescence intensity of the films.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
Xuefeng Wang, Xiaoyu Zhao, Shuai Guo, Dieter Weller, Sufeng Quan, Mengxuan Wu, Wenjun Liu, Ruibin Liu
Summary: To date, evaluating the quality of MoS2 has been inefficient or caused irreversible damage to samples, limiting scalability and throughput. In this study, we propose a visualized and nondestructive approach using the PCA machine learning method to evaluate MoS2 quality. By applying PCA processing to PL mapping, we successfully distinguish CVD-grown MoS2 samples with different edge defect densities and identify six twin GBs in the MoS2 stars. The verification of identification results through lifetime mapping and thermal expansion coefficient measurements further supports the effectiveness of our approach in assessing MoS2 quality.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Tiankun Wang, Sha Shiong Ng, Way Foong Lim, Hock Jin Quah, Muhammad Fadhirul Izwan Bin Abdul Malik, Wei Sea Chang
Summary: High-contrast green luminescence was achieved in molybdenum (Mo)-doped beta-phase gallium oxide (/3-Ga2O3) through sol-gel spin coating. The doping did not significantly alter the crystal structure, surface morphology, and energy bandgap of the films. The Mo-doped films exhibited a beta phase structure with smooth surface morphology, and the luminescence changed from blue to green, with improved contrast.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Green & Sustainable Science & Technology
Firda Tirta Yani, Husni Husin, Darmadi, Syaifullah Muhammad, Faisal Abnisa, Nurhazanah, Fahrizal Nasution, Erdiwansyah
Summary: In this study, the effect of pH and calcination temperature on the preparation of NiO/NbOPO4 catalyst for hydrodeoxygenation of palm oil into green diesel was investigated. The results showed that the catalyst prepared at pH 8 and calcination temperature of 800℃ was the most effective in removing oxygen content from palm oil and producing high yield of green diesel.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Ceramics
A. Santiago de la Rosa, D. A. Cortes-Hernandez, J. Escorcia-Garcia, H. Uriel Lopez-Herrera
Summary: White-light luminescent Tm3+-doped borosilicate glass-ceramics were synthesized by the sol-gel method. The addition of Tm2O3 increased the thermal stability, non-bridging oxygen concentration, and photoluminescence intensity, resulting in a white-emission color. These materials have potential applications as phosphors in solid-state white-light-emitting devices.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Artem D. Sinelnik, Mikhail Rybin, Dmitry S. Gets, Soslan A. Khubezhov, Lev E. Zelenkov, Sergey Makarov, Ivan I. Shishkin
Summary: Carbon dots (CDs) are a promising type of fluorescent materials with excellent properties. Laser-assisted synthesis allows the production of near-infrared emitting CDs.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Ceramics
Smita Dey, Asit Kumar Kar
Summary: The study investigates the structural and optical properties of polypyrrole-ZnO composites with different amounts of ZnO, finding that the addition of ZnO slightly affects the conjugation of the polymer chain and causes a blue shift in the pi-pi* transition. The research uses a FRET model to theoretically predict the energy transfer efficiency, Forster radius, and separation between donor and acceptor, showing that tuning the ZnO content can adjust the emission properties of the PPy-ZnO composite.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Kumud Dubey, Shubha Dubey, Anchit Modi, R. K. Sharma, Sujay Chakravarty, C. Parvathiraja, N. K. Gaur
Summary: Complex BiMn2O5 nanoparticles were successfully synthesized through a novel ultrasonication assisted sol-gel synthesis route. The nanoparticles exhibited desirable properties for applications in photocatalysts and magnetic materials.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Inorganic & Nuclear
Shihao Wu, Heng Liang, Yan Li, Wanfang Zou, Zhijian Liao, Wei Wang, Xinyu Ye
Summary: In this paper, a novel Y2Mg2Ga2-xSi2O12:xCr(3+) (YMGS:xCr(3+), x = 0.005-0.08) phosphor was developed, which exhibited broadband emission from 650 nm to 1000 nm under 440 nm excitation. The phosphor showed a peak wavelength at 790 nm and a wide full width at half-maximum (FWHM) of up to 180 nm, making it suitable for NIR spectroscopic technology. The NIR pc-LED device, combining the YMGS:0.04Cr(3+) phosphor with a commercial blue chip, achieved a near-infrared output power of 14 mW and a photoelectric conversion efficiency of 5% at a drive current of 100 mA.
DALTON TRANSACTIONS
(2023)
Article
Optics
L. R. R. Nunes, H. P. Labaki, F. J. Caixeta, R. R. Goncalves
Summary: This research highlights the highly intense NIR emissions of Pr3+, Yb3+ co-doped yttria nanoparticles, synthesized via the homogeneous precipitation method. The study reveals the lattice expansion due to the replacement of Y3+ by Pr3+ and Yb3+ ions, as well as the energy transfer process involving UV-Vis and NIR to NIR energy conversion between the doping ions and the host. These findings suggest the potential of these nanoparticles for application in biophotonics and deep-tissue imaging using NIR I and NIR II biological windows.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Joacilia Mazzini Marques de Souza, Karmel de Oliveira Lima, Jefferson Luis Ferrari, Lauro June Queiroz Maia, Rogeria Rocha Goncalves, Rodrigo Ferreira Falci, Danilo Manzani
Summary: Glass and glass-ceramics containing nanocrystals of Bi2Te4O11 cubic phase co-doped with Er3+ and Yb3+ were prepared and investigated for optical applications. The results showed that the co-doping of Yb3+ ions significantly improved the photoluminescence performance of Er3+ ions, and controlled heat treatment resulted in transparent glass-ceramics.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Ceramics
Fernanda Hediger Borges, Joana Costa Martins, Fabio Jose Caixeta, Rafael Ramiro Pereira, Luis Dias Carlos, Rute A. S. Ferreira, Rogeria Rocha Goncalves
Summary: This study investigates the effect of rare earth ion concentration on the crystalline structure and upconversion in Er3+/Yb3+ co-doped yttrium tantalates. The results show that increasing the rare earth ion concentration influences the stabilization of crystalline phases and color tunability. This research suggests potential applications of Er3+/Yb3+ co-doped yttrium tantalate nanoparticles as primary thermometers for biophotonic temperature sensing and deep tissue imaging.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Condensed Matter
L. F. Dos Santos, J. C. Martins, K. O. Lima, L. F. T. Gomes, M. T. De Melo, A. C. Tedesco, L. D. Carlos, R. A. S. Ferreira, R. R. Goncalves
Summary: Luminescent Y2O3 nanoparticles were successfully synthesized with excellent stability in biological media and demonstrated high cell viability. These nanoparticles showed potential as a primary thermometer with high thermal sensitivity and repeatability, suggesting their use as contactless optical thermal sensors. Additionally, their application in a theranostic platform for cancer therapy was proposed, leveraging their ability to simultaneously monitor temperature and produce reactive oxygen species.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Optics
Hayra do Prado Labaki, Fabio Jose Caixeta, Rogeria Rocha Goncalves
Summary: Wide multicolor tunable up-conversion emission and white light generation were achieved in Pr3+/Yb3+ co-doped yttrium tantalates prepared by a soft sol-gel method. The crystalline structure and concentration of dopants significantly influenced the photoluminescence properties, providing a broad color gamut and tunability.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Vitor dos Santos de Souza, Fabio Jose Caixeta, Karmel de Oliveira Lima, Rogeria Rocha Goncalves
Summary: Materials based on Ho3+/Yb3+/Tm3+ triply doped with GeO2-Nb2O5 were prepared and their crystalline structure and white light emission were modified by thermal annealing. The results demonstrate the promising potential of these materials for solid-state lighting in indoor and outdoor environments.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Fernanda Hediger Borges, Joana Costa Martins, Fabio Jose Caixeta, Luis D. Carlos, Rute A. S. Ferreira, Rogeria Rocha Goncalves
Summary: In this study, Er3+/Yb3+ co-doped yttrium niobate was synthesized via sol-gel method for non-invasive diagnosis techniques applications. The material exhibited intense emission and narrow emission bandwidth, with near infrared emission and upconversion emission observed under UV excitation. Furthermore, the material showed high quantum yields in near infrared and upconversion ranges, making it suitable for luminescent thermometer and biological probe applications.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Leonardo V. S. Franca, Fernanda H. Borges, Rogeria R. Goncalves, Oswaldo Baffa
Summary: The aim of this study was to evaluate the optically stimulated luminescence (OSL) lifetimes of different polycrystalline CaB6O10:Ln, Agx (Ln = Gd, Tb and Ce; x: % molar concentration) compounds. The luminescence lifetimes were determined using time-tagged time-resolved (TTTR) data analysis of the OSL under pulsed stimulation. The results showed that different compounds exhibited different dominant components and lifetimes, and the relative molar concentrations of Gd and Ag had an influence on the lifetimes.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Karmel De Oliveira Lima, Fabio Jose Caixeta, Vitor Dos Santos De Souza, Leonardo Sousa Rosa, Victor Del Vecchio Soares, Carolina Assuncao Crumo, Ivana Aparecida Borin, Jefferson Luis Ferrari, Rogeria Rocha Goncalves
Summary: This paper reports on the preparation of Er3+/Yb3+/Tm3+, Er3+/Yb3+/Nd3+, and Er3+/Tm3+/Nd3+ triply doped and Er3+-doped SiO2-Ta2O5 glass ceramic nanocomposites and active planar waveguides, and the investigation of their structural, morphological, and luminescent properties using XRD, AFM, and photoluminescence analysis. The results showed that these materials exhibited broad- and super broadband NIR emissions in the telecom wavelengths, and the rare earth ion doping concentration affected the crystallinity and crystallite sizes of the nanocomposites and waveguides.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Allison R. Pessoa, Jefferson A. O. Galindo, Luiz F. dos Santos, Rogeria R. Goncalves, Stefan A. Maier, Leonardo de S. Menezes, Anderson M. Amaral
Summary: Lanthanide-doped single dielectric nanoparticles are used for nanoscale temperature sensing with high resolution. However, the low number of emitters in individual nanocrystals requires higher excitation power densities, which can cause overlapping emissions and affect temperature measurements. This study demonstrates a method to separate and correct these overlapping bands, resulting in improved temperature readout accuracy and corrected thermal artifacts.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Inorganic & Nuclear
Mateus Grecco Manfre, Hayra do Prado Labaki, Vitor dos Santos de Souza, Rogeria R. Goncalves
Summary: In this study, Eu3+- or Nd3+-doped lanthanum niobate systems were synthesized via a sol-gel route and their structural and luminescence properties were evaluated. The Eu3+ ions predominantly occupied the C-2 symmetry sites in the LaNbO4 host lattice, while Nd3+ ions occupied distinct symmetry sites in either La3NbO7 or LaNbO4. Eu3+-doped samples have potential applications in the lighting field, while Nd3+-doped samples could be used as solid-state lasers and biomarkers.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Hayra do Prado Labaki, Fabio Jose Caixeta, Natasha Policei Marques, Eder Jose Guidelli, Rogeria Rocha Goncalves
Summary: Radioluminescence and visible photoluminescence tunability features were observed from a single Tm3+-doped yttrium tantalate phosphor prepared by a soft sol-gel method. The crystalline phase and annealing temperature had significant effects on the optical properties of Tm3+. The Tm3+-doped yttrium tantalates exhibited potential for photonic applications, particularly in integrated w-LED systems.
DALTON TRANSACTIONS
(2022)
Article
Optics
R. B. Adamov, G. A. Melentev, I. V. Sedova, S. V. Sorokin, G. V. Klimko, I. S. Makhov, D. A. Firsov, V. A. Shalygin
Summary: This study investigates the THz luminescence in doped nanostructures with GaAs/AlGaAs quantum wells under interband optical pumping. The results show that the spatial separation of donors and acceptors can greatly enhance the integrated intensity of THz emission.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yanru Li, Lei Zhong, Sha Jiang, Yutong Wang, Binyao Huang, Guotao Xiang, Li Li, Yongjie Wang, Chuan Jing, Xianju Zhou
Summary: In this study, a ratiometric luminescent thermometry based on dual-emission centers was developed using co-doped CaNb2O6 phosphors with Bi3+ and Pr3+. The obtained samples exhibited good thermosensitive and thermochromic characteristics, with a maximum absolute sensitivity of 0.09 K-1 @ 528 K and a maximum relative sensitivity of 2.17 % K-1 @ 453 K.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yujing Gong, Yeqing Wang, Zhiyuan Wang, Yijian Sun, Yi Yu
Summary: Single crystals of Dy3+ single-doped and Dy3+/Tb3+ co-doped CaYAlO4 were grown and analyzed. The incorporation of Tb3+ resulted in increased absorption and emission cross sections. The fluorescence lifetimes and branching ratios of the yellow emission were affected by the presence of Tb3+. The deactivation effect of Tb3+ ions and energy transfer mechanism were also discussed.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Lu Chen, Zhuangzhuang Ma, Jian Chen, Wang Guo
Summary: This study focuses on enhancing the thermal robustness of phosphor converter materials by preparing composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO. The composite ceramics showed high density and thermal conductivity at the optimum temperature of 1400℃. Stable laser-driven white light was obtained under blue laser excitation.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yuwei Wu, Chunhui Niu, Lei Wang, Mingqing Yang, Shiyu Zhang
Summary: Er3+-doped germanate-tellurite glasses were prepared and their structure, luminescent, and temperature-sensing properties were studied. The glass exhibited large values of O2 and O6 and its luminescence intensity varied with temperature.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Kensei Ichiba, Takumi Kato, Kenichi Watanabe, Yuma Takebuchi, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Eu-doped YVO4 single crystals with different concentrations were fabricated to evaluate their photoluminescence and scintillation properties. The results showed that the samples doped with Eu exhibited emission peaks due to 4f-4f transitions in PL and scintillation spectra. Based on the pulse height spectra, the light yield of the Eu-doped samples increased with increasing Eu concentration, while the afterglow level decreased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Daiwen Xiao, Hei-Yui Kai, Anjun Huang, Menglin Song, Ka-Leung Wong, Peter A. Tanner
Summary: The emission spectra of Cs2NaEuCl6 nanoparticles synthesized by the hot injection method are explained. The dispersion of the nanoparticles in alkane solvents in the experiment allows the determination of the magnetic dipole radiative rate for the D-5(0) -F-7(1) channel in vacuum, which is in agreement with the calculated value.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Italia V. Barbosa, Geraldine Dantelle, Alain Ibanez, Lauro J. Q. Maia
Summary: The thermal response and luminescence properties of different oxide matrices were evaluated to design more accurate thermal probes. It was found that thermal probes emitting in BW-II provide better thermal sensing with higher signal-to-noise ratio. Additionally, doping Nd3+ in Y2O3 matrix maximizes luminescence intensity, making it a promising matrix for thermal sensing.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xin Li, Yu Zhang, Hongrui Ren, Lunlong Xie, Yinsheng Di, Mengqing Han, Zhaohui Bai, Quansheng Liu, Liangliang Zhang, Jiahua Zhang
Summary: This study successfully prepared phosphor samples based on Ca3-xLuxSc2-xMgxSi3O12:Ce3+ and investigated their luminescence properties. With the increase in Lu-Mg concentration, the peak of the sample redshifted, but the thermal stability gradually decreased. The LD devices made from CLSMS:Ce3+ fluorescent materials showed a decrease in cyan-green light and an increase in red light as the Lu-Mg concentration increased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Tim Pier, Julia Hopster, Thomas Juestel
Summary: This study investigates and reports on several samples of cerium-activated gallium-based garnet phosphors. The optimal activator concentration was found to be 1 atom-%. The size of non-emitting lanthanide ions and the molar concentration of cerium strongly influenced the crystal field splitting, which in turn shaped the excitation and emission wavelengths.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Guijie Zhao, Wei Shi, Xin Xin, Fengcai Ma, Yongqing Li
Summary: This study reveals for the first time the proton transfer pathways and changes in the photophysical properties of P-TNS with three intramolecular hydrogen bonds. The reaction mechanism and driving force for the proton transfer process are explained through analysis of potential energy surface, frontier molecular orbitals, and hydrogen bond parameters, among others.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Li He, Jinshu Huang, Zhengce An, Haozhang Huang, Yu Zhao, Kexin Zhong, Bo Zhou
Summary: In this study, we designed a NaYF4:Yb3+/Tm3+@NaYF4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity. We found that the blue upconversion emission of Tm3+ decreased while the deep-red emission increased with elevating temperature. The sample also showed a gradual emission color change from blue to purplish-red, and the optimal relative sensitivity reached 2.79% K-1.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Rupesh A. Talewar
Summary: A series of Li2TiO3 phosphors doped with Mn4+ and codoped with Mn4+ and Er3+ were synthesized, which demonstrated the ability of Mn4+ ions to absorb UV-Vis photons and subsequently transfer energy to Er3+ ions, resulting in the emission of near-infrared light. These materials have the potential to enhance the absorption efficiency of Er3+-based luminescent materials.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xingyuan Ma, Jianfeng Li
Summary: Carbon quantum dots (CQDs) with tunable photoluminescence properties have been synthesized using suitable carbon and dopant sources in an aqueous system. The synthesized CQDs exhibited blue, green, yellow, and red emissions, and solid-state luminescence was achieved through the preparation of solid-state fluorescent films and phosphors. This study provides important technical support for the future development of CQDs synthesis.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
De Bin Fu, Yang Bing Xu, Yu Teng Zhang, Shan Ting Liu, Xiao Fei Yang, Sheng Hua Liu
Summary: A pair of new chiral molecules, (S)-4 and (R)-4, have been designed and synthesized by introducing valine-containing groups at symmetrical positions on the periphery of an indolo[3,2-b]carbazole unit. These molecules exhibit aggregation-induced circular dichroism (AICD) properties in DMF/water mixtures, and in a mixture with 99% water fraction, they show strong, mirror-image, blue circularly polarized luminescence (CPL) signals.
JOURNAL OF LUMINESCENCE
(2024)