Article
Optics
K. P. Tiwary, Firdaus Ali, S. K. Choubey, R. K. Mishra, K. Sharma
Summary: Ni2+ ion doped ZnS nanoparticles were synthesized using microwave assisted sol-vothermal method, with their structure, morphology, and optical properties characterized through various techniques. The results showed that the doping of Ni2+ ion affected the bandgap energy of the ZnS nanoparticles, confirming the cubic structure and crystallinity of the samples.
Article
Chemistry, Multidisciplinary
Susana Devesa, Joana Rodrigues, Silvia Soreto Teixeira, Aidan P. Rooney, Manuel P. F. Graca, David Cooper, Teresa Monteiro, Luis C. Costa
Summary: Tetragonal Er0.5Nb0.5O2 and monoclinic ErNbO4 micro- and nanoparticles were synthesized using the citrate sol-gel method and heat-treated at different temperatures to explore their optical properties. Spectroscopic studies reveal Er3+ optical activation in all samples and demonstrate a controllable selective excited tunable green to red color transition.
Article
Physics, Multidisciplinary
Priti Singh, H. Mishra, Shyam Bahadur Rai
Summary: Mixed phase ZnO-CAZO:xEu(3+) phosphors were synthesized by solid state reaction method to achieve tunable light. The study included XRD, SEM, FTIR, UV-vis absorption, photoluminescence excitation and emission spectra analysis, as well as the lifetime of Eu3+ ions at D-5(0) level. The ZnO phosphor exhibited a hexagonal structure, while Ca3Al4ZnO10 (CAZO) had an orthorhombic structure. UV-vis spectral analysis showed wide band gap for the materials. Excitation spectra of ZnO-CAZO:xEu(3+) phosphors with lambda (em) = 613 nm exhibited broad bands at 270 and 370 nm, along with discrete peaks due to Eu3+ ion. The mixed phase ZnO-CAZO:1.5Eu(3+) phosphor showed the highest emission intensity. Excitation at 394 nm resulted in white light for ZnO-CAZO:0.5Eu(3+) phosphor, which closely matched the ideal white light coordinates (0.33, 0.33).
Article
Crystallography
Nurgul Zhanturina, Daulet Sergeyev, Zukhra Aimaganbetova, Abzal Zhubaev, Karlygash Bizhanova
Summary: The article presents the results of measuring the luminescence spectra and luminescence excitation spectra for YAG:Eu with different europium concentrations. Solid-phase synthesis was used to synthesize the materials. The diffraction patterns showed full agreement with the phases for samples with concentrations of 2%, 8%, and 10%, but a yttrium-aluminum-perovskite phase was present in the sample with a concentration of 6%. The photoluminescence excitation and photoluminescence spectra were recorded for all samples, and the concentration dependences of the luminescence bands and luminescence excitation bands were plotted. The bandgap and absorption spectra were simulated for comparison with YAG:Eu samples doped with 2-4 ions of europium.
Article
Materials Science, Multidisciplinary
Kartika Maheshwari, A. S. Rao
Summary: Tb3+ doped BZLP glasses were prepared and extensively investigated for their potential use in visible photonic device applications. Spectroscopic techniques including XRD, UV-VIS absorption, and photoluminescence (PL) were employed to study the glass properties. The resulting glasses exhibited intense green emission and relatively weak emission in blue, yellow, and red regions. The PL intensity increased with the concentration of Tb3+ ions. The glasses showed a high thermal stability and suitability as a green emitter for visible photonic devices.
Article
Materials Science, Multidisciplinary
C. A. Ospina-Delacruz, V Agarwal, W. L. Mochan
Summary: An analytical model was developed to calculate the etching current density distribution in prism-shaped cells for the fabrication of layered optical devices with lateral gradient using porous silicon. Graded single layer PS samples were synthesized and their calibration curves were obtained, showing potential for predicting, designing, and fabricating complex non-homogeneous multilayered devices with lateral gradients for various applications.
Article
Materials Science, Multidisciplinary
Faiza Mustafa, Samia Aslam, Asim Arshad, Ashfaq Ahmad, Sadia Sagar, Sining Yun
Summary: This research presents the successful formation of ZnSe/amino functionalized graphene quantum dots (af-GQDs) with type-II core-shell structures. The structures show potential as a single emissive layer and exhibit tunable photoluminescence emission in the visible region. The introduction of functional groups on af-GQDs enhances their properties and reduces Auger recombination. The study also investigates the emission properties of ZnSe/af-GQDs through steady state and temperature dependent photoluminescence spectroscopy, as well as characterizes the structure using X-ray photon spectroscopy measurements. The findings suggest that ZnSe/af-GQDs have great potential for LEDs and display devices.
APPLIED MATERIALS TODAY
(2022)
Article
Materials Science, Multidisciplinary
Maria Claudia Calderon-Martinez, Maria Ines Gil-Tolano, Sofia Navarro-Espinoza, Rodrigo Melendrez, Valery Chernov, Marcelino Barboza-Flores
Summary: In this study, commercial high-pressure, high-temperature microdiamond powders were characterized and found to possess optical, structural, and surface properties comparable to high-quality synthetic diamond. The findings suggest potential applications in biosensors and radiation detection and dosimetry.
Article
Materials Science, Multidisciplinary
T. T. Nhung Nguyen, T. Sollfrank, C. Tegenkamp, E. Rauls, U. Gerstmann
Summary: The study demonstrates that the structure of weakly bound, purely vdW interacting systems is strongly influenced by screening and relaxation, as shown by combining STM and DFT methods. Analysis indicates that the deformation ability of vdW coupled systems affects molecular morphology and band structure.
Article
Chemistry, Applied
Yiteng Luo, Liwu Huang, Jianbo Liu, Zerui Wang, Qinghao Chen, Yungui Chen
Summary: To improve the performance of Li-ion batteries, researchers synthesized a p-Si/G@C composite, in which porous silicon was coated on graphite and encapsulated in carbon. It was found that porous silicon with higher porosity and smaller particle size displayed better cycle stability and rate performance in the electrode. With optimized design, the p-Si/G@C composite exhibited excellent cycle stability and high capacity retention.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Le Xuan Hung, Nguyen Hai Yen, Trinh Thi Hue, Dao Nguyen Thuan, Pham Nam Thang, Vu Thi Hong Hanh, Vu Cam Nhung, Julien Laverdant, Nguyen Thi Mai Huong, Pham Thu Nga
Summary: In this study, nitrogen-doped and sulfur-doped graphene quantum dots were successfully fabricated using the microwave-hydrothermal method. Their optical properties were extensively investigated, providing important insights for the preparation of graphene quantum dots and their applications in optoelectronic devices.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Article
Materials Science, Ceramics
G. K. Sukhadeve, S. Y. Janbandhu, Rahul Kumar, D. H. Lataye, D. D. Ramteke, R. S. Gedam
Summary: Fe doped TiO2 nanoparticles were successfully synthesized using a sol-gel method, and characterized by various analytical techniques. The doping concentration of Fe was found to affect the morphology and structure of the material. The synthesized nanoparticles exhibited excellent photocatalytic activity and removal efficiency.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Quanzhou Du, Yuhua Zhao, Kelei Zhuo, Yujuan Chen, Lifang Yang, Chunfeng Wang, Jianji Wang
Summary: This study presents a pre-assembly strategy to prepare three-dimensional hierarchical porous carbons as electrode materials for supercapacitors, aiming to investigate the effects of pore volume, pore size, and ratio of mesopores to micropores on the performance of ionic liquid-based supercapacitors. The prepared HPCs exhibit excellent specific capacity and energy density, making them promising materials for high-performance supercapacitors.
Review
Chemistry, Physical
Danish Khan, Geping Qu, Imran Muhammad, Zeguo Tang, Zong-Xiang Xu
Summary: This article provides an overview of the development of monolithic perovskite-silicon tandem solar cells and discusses the major challenges faced in achieving efficient, stable, and scalable devices. The relationship between perovskite band gap and silicon texture is crucial but currently unclear due to conflicting research outcomes.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Rohan Bahadur, Gurwinder Singh, Yoshio Bando, Ajayan Vinu
Summary: This review focuses on the synthesis methods, structure-property relationships, and application perspectives of BCN and BN, providing up-to-date information not previously covered. The porosity of BCN, a fascinating yet less explored aspect, is highlighted, with its high surface area and pore size enhancing material efficiency. The review also examines various factors affecting the structure and property relationship of BCN and discusses current challenges and future directions in application fields.
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)