Article
Materials Science, Ceramics
Lizhu Guo, Xizhen Zhang, Yuhang Zhang, Tao Yu, Chuanhui Cheng, Yi Cheng, Xiangping Li, Jinsu Zhang, Sai Xu, Yongze Cao, Baojiu Chen
Summary: CsPbBr3-xIx quantum dots glasses were fabricated using melt-quenching technique. The emission peaks are adjustable in the range of 500-530 nm and 615-692 nm, with varying FWHM. The photoluminescence decay shows biexponential behavior with short and long lifetimes.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Mengqi Lin, Xizhen Zhang, Lizhu Guo, Yuhang Zhang, Ruixin Song, Sai Xu, Huichao Zhu, Chuanhui Cheng, Yongze Cao, Yichao Wang, Baojiu Chen
Summary: Blue and green light emitting CsPbBr3 and CsPb(Cl/Br)(3) perovskite quantum dots glasses have been fabricated with adjustable emission wavelengths and high photoluminescence quantum yield. As the Cl/Br ratio increases, the emission lifetime decreases, the average lifetime decreases, and the photoluminescence quantum yield also significantly decreases. Temperature dependence of PL spectra shows a decrease in integrated intensity with increasing temperature, while emission peak wavelength and FWHM remain almost unchanged.
Article
Chemistry, Inorganic & Nuclear
Tianju Chen, Qi Yang, Peng Zhang, Ruihao Chen, Yuke Lin, Weifang Zhou, Laizhi Sui, Xuan Zheng, Guoliang Chen, Feiming Li
Summary: To address the instability of colloidal cesium lead halide perovskite nanocrystals (CsPbX3 PNCs), a stapled ligand called perfluoroglutaric acid (PFGA) is proposed to effectively passivate the surface of CsPbBr3 PNCs. The PFGA-capped CsPbBr3 PNCs exhibit high photoluminescence quantum yield, outstanding dispersion in polar solvents, and excellent stability after rigorous washing and long-term storage. These findings provide insight into surface engineering strategies for producing highly emissive and stable PNCs and broadening their sensing applications in polar media.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Soumen Mukherjee, Swarnali Ghosh, Dibyendu Biswas, Mainak Ghosal, Kheyali De, Prasun K. Mandal
Summary: Zn-alloyed CsPb(Cl/Br)(3) perovskite nanocrystals (PNCs) were synthesized and used as a model system for Mn doping to study the effect of Mn doping on exciton dynamics. The radiative decay rate of the host band decreased by about 6.5 times and the non-radiative decay rate increased by about 2.5 times upon Mn doping, while keeping the PL emission maximum and PLQY of both PNC samples nearly the same. Unlike previous reports, the integrated PL intensity of the dopant emission in this case increased by about 5.5-fold when the temperature decreased from 290 K to 190 K. The presence of shallow trap states was responsible for the truncation in the PDDs of both ON and OFF events for PNC1, whereas the deep dopant states did not allow truncation in the host PL emission of PNC2.
Article
Materials Science, Ceramics
E. Kolobkova, M. S. Kuznetsova, N. Nikonorov
Summary: CsPbX3 (X=Cl, Br, I) nanocrystals were successfully synthesized in fluorophosphate glasses for the first time, with controlled formation through adjustment of cooling rate and heat treatment conditions. The X-ray diffraction data and optical measurements confirmed the formation of 4-11 nm sized CsPbX3 nanocrystals, with the presence of two narrow bands in the luminescence spectra due to the introduction of two anions complicating the preparation process. The CsPb(Cl, Br)3 quantum dots exhibited high intensity photoluminescence with a quantum yield of 45-50% and narrow emission band.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Alasdair A. M. Brown, Parth Vashishtha, Thomas J. N. Hooper, Yan Fong Ng, Gautam Nutan, Yanan Fang, David Giovanni, Ju Nie Tey, Liudi Jiang, Bahulayan Damodaran, Tze Chien Sum, Suan Hui Pu, Subodh G. Mhaisalkar, Nripan Mathews
Summary: A scalable approach has been outlined for nucleation and growth control of CsPbBr3 nanocrystals at room temperature by utilizing different ligands, enabling precise tuning of nanocrystal diameter. The method maintains high photoluminescence quantum yield and enhances quantum confinement effects, making it suitable for a wide range of future endeavors.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Fangzheng Qi, Xia Shao, Yu Ma, Yuanyuan Sun, Jiawu Zhu, Pengwei Yin, Guoying Zhao
Summary: In-situ crystallization of CsPbX3 perovskite quantum dots in inorganic glasses enhances their stability when exposed to air. By optimizing the rigidity of borosilicate glass, the precipitation and growth of quantum dots can be finely controlled. The glass-stabilized CsPbI3 PQDs exhibit excellent water resistance and maintain high luminescence after prolonged water exposure. The combination of CsPbI3 PQDs@glass with other materials yields bright white light with high efficiency and color rendering index.
Article
Biochemistry & Molecular Biology
Ilia Litvinov, Anna Salova, Nikolay Aksenov, Elena Kornilova, Tatiana Belyaeva
Summary: In this study, the photophysical characteristics of core/shell InP/ZnS quantum dots (InP-QDs) were analyzed in cell culture medium, salt solutions, and directly in the cells. It was found that InP-QDs were internalized into endolysosomes in HeLa and A549 cells with similar dynamics to Cd-based QDs, but the two cell lines accumulated them differently. InP-QDs were reliably detected in the endosomes despite their low quantum yields. Factors such as cell culture medium, acidic pH, and salt solutions were found to affect the photoluminescence lifetime of InP-QDs. The scatter between endosomes in the same cell was observed, indicating the complex impact of these factors on the state of InP-QDs. The toxicity of InP-QDs for both cell lines at concentrations higher than 20 nM was demonstrated.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Na Wu, Yue Zhai, Peng Chang, Hang Mei, Ziyan Wang, Hong Zhang, Qiangqiang Zhu, Pei Liang, Le Wang
Summary: The doping characteristics of Mn2+ ions in CsPbCl3 PQDs are regulated by adopting the Rb+ ions co-doping strategy, and the synthesized CsPbCl3:(Rb+, Mn2+) PQDs exhibit enhanced photoluminescence quantum yield. White light emission of CsPb(Cl/Br)(3):(Rb+, Mn2+) PQDs is achieved through anion exchange reaction, and the constructed WLED has a CIE coordinate of (0.33, 0.29) and a correlated color temperature of 5497 K.
Article
Materials Science, Multidisciplinary
Marta Valles-Pelarda, Andres F. Gualdron-Reyes, Carles Felip-Leon, Cesar A. Angulo-Pachon, Said Agouram, Vicente Munoz-Sanjose, Juan F. Miravet, Francisco Galindo, Ivan Mora-Sero
Summary: The study successfully embedded CsPbBr3 quantum dots in two molecular organogels, achieving green and blue emission with high PLQY for the blue emission. This opens up a new avenue for synthesizing blue-emissive PQDs with high optical performance through post-synthetic treatment.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Physical
ChaeHyun Lee, Soo Jeong Lee, YeJi Shin, Yeonsu Woo, Sung-Hwan Han, Andres Fabian Gualdron-Reyes, Ivan Mora-Sero, Seog Joon Yoon
Summary: Controlling non-radiative charge recombination processes through synthetic and post-synthetic processes is crucial for enhancing the photophysical properties of CsPbX3 perovskite quantum dots (PQDs). Refinement of conventional recrystallization process for PbI2 and halide exchange from CsPbI3 PQDs to CsPbBr3 are effective strategies for improving the photoluminescence quantum yield (PLQY) and other photophysical properties of perovskites.
Article
Chemistry, Physical
Zachary A. VanOrman, Rachel Weiss, Megan Medina, Lea Nienhaus
Summary: Metal halide perovskite materials have revolutionized photovoltaics and are being applied in various fields due to their defect tolerance and easy tunability. Perovskite nanocrystals, surpassing traditional semiconductor nanocrystals, exhibit high photoluminescent quantum yields and efficient devices. Researchers are focusing on improving the surface of perovskite nanocrystals to enhance their optoelectronic performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Sumit Kumar Dutta, Suman Bera, Narayan Pradhan
Summary: Nanocrystal heterostructures are important for photocatalysis and photovoltaic applications. Challenges exist in the simultaneous formation of perovskite and chalcogenide nanocrystals due to differences in bonding nature and formation mechanisms. Further research is needed to understand the nucleation and growth of these materials and develop common reaction pathways for heteronucleation.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jian Yang, Xi Yuan, Lin Fan, Yuzhu Zheng, Fanshu Ma, Haibo Li, Jialong Zhao, Huilian Liu
Summary: This study investigated the optical and structural properties of Mn-doped cesium lead halide perovskite nanocrystals with the incorporation of rubidium ions. It was found that the Mn2+ emission quantum yield was highest at 63.18% with a Rb+ content of 0.1, and the emission was significantly enhanced at low temperature. Incorporating Rb+ ions enhanced the Mn2+ emission of the Mn-doped nanocrystals.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Qi Liu, Jun Yin, Bin-Bin Zhang, Jia-Kai Chen, Yang Zhou, Lu-Min Zhang, Lu-Ming Wang, Qing Zhao, Jingshan Hou, Jie Shu, Bo Song, Naoto Shirahata, Osman M. Bakr, Omar F. Mohammed, Hong-Tao Sun
Summary: Through density functional theory calculations and molecular dynamics simulations, a theory-guided general synthetic concept for highly luminescent CsSnX3 nanocrystals has been developed. A colloidal synthesis strategy has been established to produce high-quality CsSnX3 nanocrystals under different reaction conditions, which may stimulate intense efforts on tin-based perovskite nanocrystals for potential applications in high-performance optoelectronic devices.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)