Article
Chemistry, Physical
Tory A. Welsch, Jill M. Cleveland, D. Bruce Chase, Matthew F. Doty
Summary: The seeded growth of core/thick-shell CdTe/CdS QDs was studied, revealing the critical role of particle concentration in the shell growth mechanism and the dependence of oleic acid impact on particle concentration for a given shell thickness. Optimal conditions shift when targeting increasingly thick shells.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jing-Yin Xu, Xin Tong, Lucas V. Besteiro, Xin Li, Chenxia Hu, Ruitong Liu, Ali Imran Channa, Haiguang Zhao, Federico Rosei, Alexander O. Govorov, Qiang Wang, Zhiming M. Wang
Summary: By synthesizing a new type of CuInTeSe/CdS g-QDs and regulating their optoelectronic properties through controlling the shell thickness, the research has demonstrated improved photoresponse and stability, laying a foundation for future QD-based optoelectronic technologies.
Article
Optics
Yu Hao, Liwei Wang, Baohua Zhu, Yimin Zhang, Yuzong Gu
Summary: In this study, the NLO properties of reduced graphene oxide (rGO) were regulated using a functionalizing strategy with quantum dots (QDs) of gold nanospheres and Au@CdS core-shells. The saturation absorption of rGO weakened with the addition of gold nanospheres, switching to reverse saturation absorption with Au@CdS core-shells. The strength of reverse saturation absorption was tunable with the size of Au@CdS core-shells, while the nonlinear susceptibility was enhanced when combined with Au@CdS core-shells compared to complex gold. The regulation effect was explained by proposing a charge transfer mechanism.
Article
Nanoscience & Nanotechnology
Sadra Sadeghi, Rustamzhon Melikov, Mehmet Sahin, Sedat Nizamoglu
Summary: The synthesis of heterostructured core-shell nanocrystals has great potential in energy, medicine, and environmental applications. In this study, Au@ZnTe core-shell nanostructures were synthesized for the first time using a non-toxic, versatile synthetic route, resulting in bright nanocrystals with high photoluminescence quantum yield. The optimized synthesis method opens up significant possibilities for future bio-imaging and optoelectronic applications.
Article
Chemistry, Physical
Huifang Dong, Jingwen Feng, Jia Liu, Xiaodong Wan, Jiatao Zhang, Zhuan Wang, Hailong Chen, Yu-Xiang Weng
Summary: The study found that in Au@CdS core-shell nanocrystals, the efficiency of hot-electron injection increases initially and then decreases with the thickness of the CdS shell, offering a practical approach to optimize the photocatalytic efficiency of metal-semiconductor heterostructures by tuning their structure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Jiakuan Zhang, Jiongzhao Li, Zikang Ye, Jiting Cui, Xiaogang Peng
Summary: This study investigates the photochemical properties of CdSe/ZnSe core-shell quantum dots (QDs) under ambient conditions, showing opposite responses to oxygen and water compared to CdSe/CdS core/shell QDs. The ZnSe shells act as a barrier for electron transfer to surface-adsorbed oxygen but facilitate hot-electron transfer to oxygen. This efficient transfer process competes with relaxation of hot electrons, leading to complete quenching of photoluminescence (PL) and oxidation of surface anion sites. Water partially cancels the photochemical effects of oxygen, while alkylphosphines can stop and recover PL. ZnS outer shells slow down photochemical effects but cannot fully prevent PL quenching by oxygen.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Muhammad Haroon Rashid, Ants Koel, Toomas Rang, Nadeem Nasir, Nadeem Sabir, Faheem Ameen, Abher Rasheed
Summary: Quantum-dot-based core/shell structures have gained significance recently due to their optical, optoelectronic, and magnetic attributes. This study developed novel Cu-doped CdS/ZnS shell structures to enhance photoluminescence properties. Experimental results showed that Cu-doped ZnS shells adopted the crystal structure of CdS, minimizing lattice mismatch and offering better passivation, resulting in increased photoluminescence.
Article
Chemistry, Multidisciplinary
Xiaoyu Qiu, Veronica Pawlik, Shan Zhou, Jing Tao, Younan Xia
Summary: Two growth patterns of Au atoms on penta-twinned Pd decahedra were reported, resulting in asymmetric Pd-Au Janus icosahedra and anisotropic Pd@Au core-shell starfishes, respectively. The injection rate of Au(III) ions determined the growth pattern, with slow injection leading to asymmetric growth and fast injection resulting in symmetric growth. Mechanistic analysis revealed the formation process of the two heterostructures.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Volodymyr Dzhagan, Nazar Mazur, Olga Kapush, Oleksandr Selyshchev, Anatolii Karnaukhov, Oleg A. Yeshchenko, Mykola I. Danylenko, Volodymyr Yukhymchuk, Dietrich R. T. Zahn
Summary: This study investigates the influence of the parameters of the shell and interface in semiconductor core/shell nanocrystals (NCs) on their optical properties and charge transfer, using Raman spectroscopy. The results show that the use of thioglycolic acid (TGA) during the synthesis leads to the formation of a CdS shell around the CdTe core in the NCs. The optical absorption and photoluminescence bands of these NCs are determined by the CdTe core, while the far-infrared absorption and resonant Raman scattering spectra are dominated by the vibrations related to the shell.
Article
Chemistry, Multidisciplinary
Xue Bai, Finn Purcell-Milton, Yurii K. Gun'ko
Summary: Cu-Based quantum dots are being explored as a potential replacement for toxic Cd- or Pb-based QDs, with studies focusing on the impact of different reaction conditions on the resulting morphologies and optical properties. By carefully controlling the ZnS shell deposition, researchers have optimized the synthesis of CIZS/ZnS/ZnS QDs and produced highly fluorescent core/shell/shell heterostructured QDs with high PLQYs. Additionally, the successful creation of giant ZnS shell QDs opens up possibilities for further development in this area.
Article
Chemistry, Physical
Yonglei Sun, Hua Zhu, Na Jin, Ou Chen, Jing Zhao
Summary: Lifetime blinking, a phenomenon of fluctuations in the fluorescence lifetime of a single quantum dot over time while its fluorescence intensity remains relatively stable, has been reported in a few QD systems. In this study, statistical methods demonstrate that compact CdSe/CdS core/shell QDs also exhibit short-lived lifetime blinking events, possibly due to the activation of efficient nonradiative processes leading to intensity blinking.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
E. Irani, E. Yazdani, A. Bayat
Summary: The structural and optical properties of high luminescent CdTe/CdS core/shell quantum dots in a stable, aqueous medium have been investigated, revealing wavelength tunability by adjusting the shell thickness. A 10 nm shell thickness for CdS showed higher photoluminescence quantum yield and improved optical nonlinearities compared to CdTe quantum dots and CdTe/CdS core/shell quantum dots with 16 nm thickness.
Article
Chemistry, Physical
Nina N. Kurus, Alexander G. Milekhin, Roman Sklyar, Bedil M. Saidzhonov, Roman B. Vasiliev, Sergei Adichtchev, Nikolai Surovtsev, Alexander Latyshev, Dietrich R. T. Zahn
Summary: The phonon spectra of core/shell CdSe/CdS nanoplatelets with different shell thicknesses were studied, revealing frequency shifts of optical modes as the shell thickness increases, which can be explained in terms of the stress state in the core and shell, as well as the influence of phonon confinement.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Haorui Dong, Haiyan Zhao, Tongtong Xuan, Wenhao Bai, Tianyu Lin, Yixin Cai, Rong-Jun Xie
Summary: Lead halide perovskite nanocrystals with a perovskite/linear low-density polyethylene (perovskite/LLDPE) core/shell structure were successfully synthesized to achieve high photoluminescence quantum yield (PLQY) and high stability. The improved photoluminescence properties were attributed to the enhanced pressure effect and interaction between ligand and perovskite crystals. The resulting nanocrystals showed high stability under ambient conditions and against UV light, and were used to fabricate white-emitting Mini-LEDs with a super wide color gamut.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Biyun Ren, Bing Chen, Jianxiong Zhao, Yang Guo, Xin Zhang, Xian Chen, Yangyang Du, Zhiqin Deng, Guangyu Zhu, Feng Wang
Summary: Lanthanide-doped ScF3 nanoparticles were synthesized and studied for their thermal enhancement of upconversion, showing a significant increase in emission within a certain temperature range and high temperature sensitivity. The development of new methods may inspire the creation of thermally enhanced upconversion nanoparticles with high emission intensities.
CHEMISTRY OF MATERIALS
(2021)
Article
Energy & Fuels
Onkar S. Shinde, Adinath M. Funde, Shital V. Kahane, Mohit Agarwal, Sandesh R. Jadkar, Shailaja R. Mahamuni, Rajiv O. Dusane, Subhash V. Ghaisas
Article
Chemistry, Physical
Shital V. Kahane, R. Sasikala, B. Vishwanadh, V. Sudarsan, Shailaja Mahamuni
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2013)
Article
Optics
Shital V. Kahane, V. Sudarsan, Shailaja Mahamuni
JOURNAL OF LUMINESCENCE
(2014)
Proceedings Paper
Physics, Applied
Shital V. Kahane, R. Sasikala, V. Sudarsan, Shailaja Mahamuni
SOLID STATE PHYSICS: PROCEEDINGS OF THE 58TH DAE SOLID STATE PHYSICS SYMPOSIUM 2013, PTS A & B
(2014)
Article
Nanoscience & Nanotechnology
Shital V. Kahane, Darshana Y. Inamdar, Shailaja Mahamuni
JOURNAL OF NANO- AND ELECTRONIC PHYSICS
(2011)
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)