Article
Materials Science, Ceramics
Shiming Hao, Pengru Liu, Haozhan Wu, Huifang Wang, Jingpei Xie
Summary: SiC nanopowders were synthesized using silicon powders and expanded graphite as initial materials, and ferric nitrate as catalyst precursor. The effects of heat treatment temperature and the C/Si molar ratio on SiC products were investigated. The microstructure, phase composition, chemical state, and photoluminescence properties of the products were analyzed. The results showed that the 3C-SiC product had a higher content when heat-treated at 1400 degrees C for 3 hours with a C/Si molar ratio of 1:1. The formation process of 3C-SiC could be explained by a two-step method, and it exhibited potential applications in ultraviolet detectors, optoelectronic devices, and light emitters.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Cheng Wang, Jiawen Zhou, Ming Song, Zhongshan Lu, Xianhui Chen, Yan Zheng, Weidong Xia
Summary: A novel process based on atmospheric nonthermal arc plasma was proposed for the continuous synthesis of ultrafine SiC nanoparticles with small size (5-9 nm) and narrow size distribution. The addition of hydrogen in plasma gas can tune the product characteristics and induce a blueshift in the photoluminescence peak of the beta-SiC nanoparticles. The as-prepared nanoparticles had a high band gap and showed a quantum confinement effect due to their ultrafine size.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Optics
Li-Yang Sunny Chang, Steve Pappert, Paul K. L. Yu
Summary: The thermo-optic coefficient (TOC) of silicon-rich amorphous silicon carbide (a-SiC) thin film deposited by plasma-enhanced chemical vapor deposition (PECVD) was characterized in this work. It was found that the TOC increases with the silicon content of the film. The TOC showed a more than threefold improvement, reaching a value as high as 1.88 x 10-4 degrees C-1, comparable to crystalline silicon. An efficient thermo-optic phase shifter was demonstrated by integrating the silicon-rich a-SiC micro-ring structure with a NiCr heater, achieving a tunability of 0.117 nm/mW and a tuning efficiency P pi as low as 4.2 mW at an optical wavelength of 1550 nm. These findings suggest silicon-rich a-SiC as a promising material for thermo-optic applications in photonic integrated circuits.
Article
Optics
I. Gavrilchenko, Y. S. Milovanov, S. Gryn, S. A. Alekseev, A. N. Zaderko, A. G. Shkavro, I. I. Ivanov, V. A. Skryshevsky
Summary: In this study, we reported on the structural and photoluminescence properties of porous silicon carbide formed by electro-chemical etching of SiC plate. The photoluminescence spectrum in the visible region was observed and could be fitted with at least three peaks, with the properties discussed in relation to SEM, TEM, and Raman studies. The nature of the peaks were explained by electron-hole recombination, surface defect centers, and SiC nanocrystallites.
JOURNAL OF LUMINESCENCE
(2021)
Article
Automation & Control Systems
Andrigo Elisiario da Silva, Jorge Luiz Cuesta, Jose Claudio Lopes, Douglas Lyra de Moraes, Mateus Vinicius Garcia, Fernando Sabino Fonteque Ribeiro, Hamilton Jose de Mello, Luiz Eduardo De Angelo Sanchez, Paulo Roberto Aguiar, Eduardo Carlos Bianchi
Summary: The study shows that in the grinding process of VP50IM mold steel, using a green silicon carbide grinding wheel has advantages, with less wear, acoustic emission, and grinding power consumption compared to black silicon carbide wheel, even better than white aluminum oxide.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yuanyuan Li, Xiaoyu Liu, Tianyuan Liang, Jiyang Fan
Summary: The surface of SiC quantum dots is a complex two-dimensional system with abundant surface reconstruction and passivation, affecting their chemistry and photophysics. This study reports the novel yellow fluorescence of colloidal SiC QDs in the quantum confinement regime, which decays much slower compared to previously observed blue-green fluorescence. The calculations show that the yellow fluorescence originates from trapped surface states at the Si=O bond, providing a better understanding of the surface properties of SiC QDs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Applied
Johannes Engel, Kaushalya Jhuria, Debanjan Polley, Tobias Luehmann, Manuel Kuhrke, Wei Liu, Jeffrey Bokor, Thomas Schenkel, Ralf Wunderlich
Summary: A common technique for creating color centers in wideband gap semiconductors is ion implantation followed by thermal annealing. Typically, this annealing process takes place in a vacuum oven. In this study, we utilized annealing based on femtosecond laser pulses. By implanting fluorine ions at 54 keV and chlorine ions at 74 keV into diamond, and performing micrometer precise annealing using focused femtosecond laser pulses (800 nm +/- (30) nm) with varying pulse numbers and repetition rates, we successfully created shallow spots with color centers of different brightness.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Shunta Harada, Kota Tsujimori, Yosuke Matsushita
Summary: An algorithm for automatically detecting basal plane dislocations in SiC epitaxial layers was constructed and evaluated in this study. Based on the template-matching method, the algorithm demonstrated high accuracy and precision, allowing for visualization of BPD density in 150-mm SiC epitaxial wafers. It was confirmed that the template-matching method is suitable for detecting crystalline defects with geometrically fixed shapes like BPDs in SiC epitaxial layers.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Ceramics
Xin Wang, Tao Yang, Xinmei Hou, Yapeng Zheng, Enhui Wang, Zhengtao Du, Sheng Cao, Hailong Wang
Summary: Silicon carbide nanowires (SiC NWs) were synthesized using graphene and Si powder, forming a 2H/3C-SiC heterojunction structure, with significant blue shift in the photoluminescence spectra due to structural defects.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Maricela Meneses-Meneses, Mario Moreno-Moreno, Alfredo Morales-Sanchez, Arturo Ponce-Pedraza, Javier Flores-Mendez, Julio Cesar Mendoza-Cervantes, Liliana Palacios-Huerta
Summary: This study investigated the feasibility of fabricating PIN light-emitting diodes (LEDs) using a-Si1-xCx:H thin films and c-Si wafers, successfully demonstrating both positive and negative electroluminescence characteristics in the devices.
Article
Materials Science, Multidisciplinary
Jiawen Zhou, Cheng Wang, Ming Song, Xianhui Chen, Weidong Xia
Summary: An atmospheric non-thermal arc plasma source based on magnetically stabilized gliding arc discharge was developed for the continuous preparation of ultrafine amorphous silicon carbide (a-SiC) nanoparticles via hexamethyldisilane decomposition. The synthesized nanoparticles showed strong blue-green light emission and had abundant functional groups and oxidized overlayers on their surface. Low input energy favored the synthesis of a-SiC nanoparticles, while high input energy promoted the transition from amorphous structure to b-SiC.
Article
Chemistry, Multidisciplinary
Shengtao Zhang, Guofeng Fan, Tie Li, Lili Zhao
Summary: By modeling and optimizing the physical fields in the SiC crystal growth process with the numerical simulation software Virtual Reactor, high-quality and large-sized SiC crystals were successfully prepared. This is of great importance for the application of SiC in the new energy industry.
Article
Physics, Applied
Jayeeta Biswas, Geetika Bajaj, Astha Tyagi, Prerna Goradia, Saurabh Lodha
Summary: Ternary dielectrics formed by alloying two binary oxides can achieve tunable optical and electrical properties through precise control of composition using atomic layer deposition (ALD). Si-rich SixTi1-xO2 films with varied composition were successfully fabricated using ALD, showing promising characteristics for diverse optical applications. Plasma-enhanced ALD exhibited higher deposition rates and lower leakage current densities compared to thermally deposited films, with potential for achieving dielectric constants as low as 5.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
C. Raynaud, M. L. Locatelli, J. F. Mogniotte, R. Arvinte, G. Grosset
Summary: 4H-SiC epilayers with thick oxides were studied for Metal-Oxide-Semiconductor capacitors using C-V and TSIC measurements, revealing a large presence of positive charges in the oxide and detection of several traps. The analysis also showed the presence of K+ and Na+ ions in concentrations matching the TSIC measurements.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Yize Su, Chenhao Wang, Zijian Hong, Wei Sun
Summary: Silicon nanocrystals have drawn significant attention in recent decades for their unique luminescent properties, with thermal disproportionation method offering precise control over their size and structure, showing promising industrial applications. Research has shown that factors such as temperature, Si/O ratio, and surface groups play a crucial role in determining the properties of silicon nanocrystals.
FRONTIERS IN CHEMISTRY
(2021)
Review
Ophthalmology
Louise Pellegrino G. Esporcatte, Marcella Q. Salomao, Bernardo T. Lopes, Nelson Sena, Erica Ferreira, Joao Batista R. F. Filho, Aydano P. Machado, Renato Ambrosio
Summary: Biomechanical assessment plays a crucial role in the screening, diagnosis, and treatment of ectatic corneal diseases, and various devices can provide biomechanical measurements and data integration.
CURRENT EYE RESEARCH
(2023)
Article
Ophthalmology
Prema Padmanabhan, Bernardo T. Lopes, Ashkan Eliasy, Ahmed Abass, Riccardo Vinciguerra, Paolo Vinciguerra, Renato Ambrosio, Ahmed Elsheikh
Summary: This study evaluated the corneal material properties in healthy individuals and keratoconic patients using the stress-strain index (SSI). The results showed significant differences in SSI between different groups, with a progressive reduction in SSI as the disease progressed. Furthermore, SSI was positively correlated with age.
JOURNAL OF CATARACT AND REFRACTIVE SURGERY
(2022)
Article
Ophthalmology
Gildasio Castello Almeida, Rodrigo Capobianco Guido, Henrique Monteiro Balarin Silva, Cinara Cassia Brandao, Luiz Carlos de Mattos, Bernardo T. Lopes, Aydano Pamponet Machado, Renato Ambrosio
Summary: The efficiency of an index derived from multiple logistic regression analysis (MLRA) in measuring differences in corneal tomography findings between subclinical keratoconus (KC), corneal ectasia, and healthy corneas was assessed. The study found that the index (BESTi) facilitated early detection of subclinical KC with higher sensitivity and specificity compared to other indices (BAD-D and PRFI).
JOURNAL OF CATARACT AND REFRACTIVE SURGERY
(2022)
Article
Ophthalmology
Renato Ambrosio, Aydano P. Machado, Edileuza Leao, Joao Marcelo G. Lyra, Marcella Q. Salomao, Louise G. Pellegrino Esporcatte, Joaob. R. Da Fonseca Filho, Erica Ferreira-Meneses, Nelson B. Sena, Jorge S. Haddad, Alexandre Costa Neto, Gildasio Castelo De Almeida, Cynthia J. Roberts, Ahmed Elsheikh, Riccardo Vinciguerra, Paolo Vinciguerra, Jens Buhren, Thomas Kohnen, Guy M. Kezirian, Farhad Hafezi, Nikki L. Hafezi, Emilio A. Torres-Netto, Nanji Lu, David Sung Yong Kang, Omid Kermani, Shizuka Koh, Prema Padmanabhan, Suphi Taneri, William Trattler, Luca Gualdi, Jose Salgado-Borges, Fernando Faria-Correia, Elias Flockerzi, Berthold Seitz, Vishal Jhanji, Tommy C. Y. Chan, Pedro Manuel Baptista, Dan Z. Reinstein, Timothy J. Archer, Karolinne M. Rocha, George O. Waring, Ronald R. Krueger, William J. Dupps, Ramin Khoramnia, Hassan Hashemi, Soheila Asgari, Hamed Momeni-Moghaddam, Siamak Zarei-Ghanavati, Rohit Shetty, Pooja Khamar, Michael W. Belin, Bernardo T. Lopes
Summary: This study aims to enhance ectasia detection by optimizing artificial intelligence algorithms to integrate Scheimpflug-based corneal tomography and biomechanics.
AMERICAN JOURNAL OF OPHTHALMOLOGY
(2023)
Article
Ophthalmology
Julia Polido, Maria Emilia Xavier Dos Santos Araujo, Tais H. Wakamatsu, Joao G. Alexander, Thiago Cabral, Renato Ambrosio Jr, Denise Freitas
Summary: This study assessed the effectiveness and safety of corneal crosslinking (CXL) in reducing keratoconus (KC) progression and improving visual acuity among children with progressive KC. The use of 20% dextran-based and 1% hydroxypropyl methylcellulose-based riboflavin was analyzed. The results showed that CXL can effectively slow down the progression of KC and improve visual acuity.
AMERICAN JOURNAL OF OPHTHALMOLOGY
(2023)
Article
Energy & Fuels
Victor Hugo Garcia-Rodriguez, Jose Humberto Perez-Cruz, Roberto Carlos Ambrosio-Lazaro, Salvador Tavera-Mosqueda
Summary: This paper presents an analysis and simulation of a mathematical model for a DC/DC Boost converter-full-bridge Buck inverter system. The model is used to regulate voltage output and allow for bipolar voltages higher than the input voltage. The results of the simulation show acceptable error signals and validate the good performance of the system. The main contribution of this work is the analysis of a complete dynamics for a DC to AC conversion system without the use of a transformer, using differential flatness.
Article
Chemistry, Physical
A. F. Jaramillo-Alvarado, A. Torres Jacome, P. Rosales-Quintero, H. Vazquez-Leal, G. Diaz-Arango, J. Huerta-Chua, J. Martinez-Castillo
Summary: Nonlinear piezoelectric materials are considered as a promising alternative to meet the demanding requirements of new technologies. This work presents accurate state equations and a fast methodology for implementing them in simulation software, allowing for easy design and characterization of nonlinear piezoelectric devices. The effectiveness of the state equations is demonstrated through experimental measurements and simulations, showing their potential for unifying nonlinear phenomena in piezoelectric devices.
Article
Chemistry, Multidisciplinary
Gabriel Omar Mendoza Conde, Jose Alberto Luna Lopez, Zaira Jocelyn Hernandez Simon, Jose Alvaro David Hernandez de la Luz, Karim Monfil Leyva, Jesus Carrillo Lopez, Haydee Patricia Martinez Hernandez, Erick Gastellou Hernandez, Dainet Berman Mendoza, Javier Flores Mendez
Summary: This study investigated hybrid structures composed of nanostructured layers, including porous silicon (PSi), carbon nanotubes (CNTs), graphene oxide (GO), and silicon-rich oxide (SRO). PSi layers were obtained through electrochemical etching, followed by deposition of CNTs and GO through spin coating. SRO layers, embedding silicon nanocrystals, were obtained using hot filament chemical vapor deposition (HFCVD). Photoluminescence (PL) spectra were measured and compared for different hybrid structures, revealing a shift towards higher energies in the PL spectra of CNTs/SRO and GO/SRO structures compared to PSi layers. Deconvolution of PL spectra identified different emission mechanisms and demonstrated the potential of these hybrid structures in the field of photonic and electroluminescent devices.
Article
Ophthalmology
Tomas Loureiro, Sandra Rodrigues-Barros, Ana Rita Carreira, Filipe Gouveia-Moraes, Pedro Carreira, Ana Vide Escada, Paul Campos, Ines Machado, Nuno Campos, Renato Ambrosio Jr, Timothy J. Archer, Dan Z. Reinstein
Summary: The purpose of this study was to evaluate the changes in epithelial thickness before and after topical treatment in primary Sjogren syndrome-associated dry eye disease (SS-DED). Corneal epithelial thickness was measured using high-definition anterior segment optical coherence tomography. The results showed that treatment with sodium hyaluronate improved various clinical parameters in SS-DED patients and indicated that epithelial thickness could be considered as a clinical biomarker for SS-DED.
CLINICAL OPHTHALMOLOGY
(2023)
Article
Ophthalmology
Sana Niazi, Majid Moshirfar, Fatemeh Alizadeh, Farideh Doroodgar, Alireza Baradaran-Rafii, Oliver Filutowski, Feizollah Niazi, Renato Ambrosio Jr
Summary: This nationwide registration study aimed to examine the association of KC with two known single nucleotide polymorphisms (rs2956540 and rs10519694) in a population of Iranian descent. The results revealed that rs2956540 and rs10519694 are associated with KC, and rs10519694 may serve as a marker for KC risk prediction.
OPHTHALMOLOGY SCIENCE
(2023)
Article
Ophthalmology
Riccardo Vinciguerra, Renato Ambrosio, Yan Wang, Fen Zhang, Xingtao Zhou, Ji Bai, Keming Yu, Shihao Chen, Xuejun Fang, Paolo Vinciguerra
Summary: The aim of this study was to introduce an optimized version of the Corvis Biomechanical Index (cCBI) for Chinese populations. By optimizing the constants of the CBI using logistic regression, a new version of the index named cCBI was created. The validation results showed that cCBI was statistically significantly better than CBI in separating healthy from keratoconic eyes in Chinese patients.
AMERICAN JOURNAL OF OPHTHALMOLOGY
(2023)
Review
Ophthalmology
Renato Ambrosio, Marcella Q. Salomao, Lorena Barros, Joao Batista R. da Fonseca, Jaime Guedes, Alexandre Neto, Aydano P. Machado, Bernardo T. Lopes, Nelson Sena, Louise Pellegrino Gomes Esporcatte
Summary: Different diagnostic approaches, including various imaging tools and genetic/molecular biology tests, are used for the screening, diagnosis, classification, and prognostic evaluation of ectatic corneal diseases. Artificial intelligence enhances interpretation and facilitates clinical decisions. Diagnostic information is crucial for individualized treatments and the management of patients at risk of progressive ectasia.
Article
Ophthalmology
Marcella Q. Salomao, Ana Luisa Hofling-Lima, Louise Pellegrino Gomes Esporcatte, Fernando Faria Correa, Erica Ferreira Meneses, Yan Li, David Huang, Bernardo Lopes, Nelson Sena, Aydano P. Machado, Renato Ambrosio
Summary: The purpose of this study was to test the ability of the corneal epithelial pattern standard deviation (PSD) to differentiate between normal eyes and cases with corneal ectatic conditions. The results showed that PSD can be used to detect abnormal epithelial thickness patterns and accurately detect changes in corneal epithelial thickness in patients with keratoconus, even in the early stages of the disease.
JOURNAL OF CATARACT AND REFRACTIVE SURGERY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
A. F. Jaramillo Alvarado, A. Torres Jacome, F. J. De la Hidalga-W, P. Rosales-Quintero
Summary: This paper presents the stress-charge formulation for nonlinear piezoelectric materials, which is compatible and easy to implement for commonly used simulation tools in industry and research. The simulation results for variable capacitance and resonance frequency shift show good fitting with recent experimental results.
2022 IEEE LATIN AMERICAN ELECTRON DEVICES CONFERENCE (LAEDC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
F. Montalvo-Galicia, M. T. Sanz-Pascual, P. Rosales-Quintero, M. Moreno-Moreno
Summary: A parameter extraction method for the two-diode model of solar cells based on the I-V characteristic is proposed, which is implemented in Octave and shows better accuracy in predicting the maximum power point of solar cells compared to other existing methods.
2022 IEEE 65TH INTERNATIONAL MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS (MWSCAS 2022)
(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)
