Article
Optics
Xiaonan Zhu, Fei Gao, Cen Zhang, Weizhen Liu
Summary: All-inorganic cesium-lead-halide perovskite nanocrystals have attracted attention due to their exceptional photoelectric properties. However, their optical stability and anion-exchange reaction between different halides have been problematic. This study investigated the intermediate stages of the anion-exchange process in solution and film, and successfully prevented the halogen anion-exchange reaction by inserting a thin polystyrene layer. Stable white emission was achieved.
JOURNAL OF LUMINESCENCE
(2022)
Article
Multidisciplinary Sciences
Gabriele Raino, Nuri Yazdani, Simon C. Boehme, Manuel Kober-Czerny, Chenglian Zhu, Franziska Krieg, Marta D. Rossell, Rolf Erni, Vanessa Wood, Ivan Infante, Maksym Kovalenko
Summary: Semiconductor quantum dots, considered as artificial atoms, have broader emission spectrum than atomic emission lines. By simulating the interactions between excitons and surface phonons, the emission line-broadening in quantum dots can be controlled.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Mou-Ce Jiang, Chun-Yang Pan
Summary: Mn:CsPbBr3 phosphor quantum dots (PQDs) were prepared by the hot injection method, and it was observed that the optical properties improved with increasing Mn doping. The Mn-doped PQDs showed good stability and luminescent properties in polar solutions. Furthermore, the study revealed the main cause of instability in CsPbBr3 PQDs and provided a reference for optimizing their application.
Article
Materials Science, Multidisciplinary
Xi-Bing Li, Wen-Tao Huang, Rui-Rong Zhang, Yue Guo, Hui-Jie Yang, Xiao-Yue He, Ming-Xun Yu, Li-Xi Wang, Qi-Tu Zhang
Summary: All-inorganic perovskites CsPbX3 have excellent luminescent performances, while Cs4PbBr6 can enhance the luminescent efficiency and stability of CsPbBr3. A microfluidic method was introduced to synthesize blue-emitting CsPbBr3 nanocrystals and green-emitting CsPbBr3/Cs4PbBr6 nanocrystals. CsPbBr3/Cs4PbBr6 showed longer lifetime and better stability than CsPbBr3.
Article
Chemistry, Physical
Chi Zhang, Linyuan Lian, Jianbing Zhang, Xiaoming Su, Sisi Liu, Yulong Gao, Zhengyan Lian, Dezhu Sun, Wei Luo, Haimei Zheng, Daoli Zhang
Summary: Due to their excellent charge-transport properties, strong light absorption, and long excited-state lifetime, metal halide perovskites have gained attention in the field of solar cells, light-emitting diodes, and other optoelectronic devices. The research on low-dimensional metal halide perovskite nanoparticles has opened up possibilities for improving the stability and luminescence of their three-dimensional counterparts.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Xuyong Tao, Boyan Liu, Guoqing Tong, Hanwen Zhu, Junchun Li, Yuanyuan Sheng, Chengyun Wu, Yajing Chang, Yangqing Wu, Yang Jiang
Summary: Ligand exchange in combination with light illumination using N-acetyl-L-cysteine (NAC) as a ligand is devised to enhance the PLQY and stability of CsPbBr3 QDs. This strategy leads to reduced surface defects, nearly 100% PLQY, and remarkable stability in polar solvents.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Nazifa Tabassum, Zheni N. N. Georgieva, Gouranga H. H. Debnath, David H. H. Waldeck
Summary: It has been found that the mechanism of chiral imprinting changes from electronic interactions to surface effects as the size of nanoparticles increases. These findings provide a benchmark for quantitative models of chiral imprinting.
Article
Chemistry, Inorganic & Nuclear
Ya-Chu Yang, Yun-Wen Peng, An-Ting Lee, Gautam Kumar, Michael H. Huang
Summary: By adjusting the synthesis conditions of CsPbBr3, crystals of different shapes can be synthesized, each with different optical properties. Converting CsPbBr3 rhombic dodecahedra and octahedra to CsPbI3 also leads to larger optical band shifts.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Yanping Liu, Yubin Zhao, Yuanna Zhu, Yan Zhan, Katarzyna Matras-Postolek, Ping Yang
Summary: In this study, CsPbBr3:Mn nanocrystals were synthesized via a hot injection method. It was found that Mn doping can enhance the photoluminescence efficiency and stability of the nanocrystals. Anion exchange reaction using benzoyl chloride resulted in bright Mn ion orange emission. White light-emitting diodes (LED) with high performance were created using CsPbBr3:Mn nanocrystals.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Multidisciplinary
Mohamed-Raouf Amara, Zakaria Said, Caixia Huo, Aurelie Pierret, Christophe Voisin, Weibo Gao, Qihua Xiong, Carole Diederichs
Summary: In this study, we investigate the photoluminescence of single CsPbBr3 nanocrystals at cryogenic temperatures to reveal the size-dependence of their spectral features in the intermediate quantum confinement regime. We analyze the bright triplet exciton energy splittings, trion and biexciton binding energies, and optical phonon replica spectrum. Our results indicate that the bright triplet energy splittings are consistent with a pure exchange model, and the variety of polarization properties and spectra observed can be explained by considering the orientation of the emitting dipoles and the populations of the emitting states.
Article
Chemistry, Multidisciplinary
Shuhua Chen, Qixuan Zhong, Jun Liu, Wenhao Guan, Pengli Li, Israr Mahmood, Muhan Cao, Qiao Zhang
Summary: A passivation strategy using inorganic phosphate and bromide ions on CsPbBr3 NCs has been developed, resulting in near-unity quantum yield, enhanced radiative recombination, and improved durability against polar solvents. The treated NCs have been applied successfully in fabricating a white light emitting diode (WLED) with high luminous efficiency and operational stability.
Article
Materials Science, Multidisciplinary
Panyi Zhang, Shaoju Li, Huiming Xie, Zhen Liu, Shayu Li
Summary: Lead halide perovskite nanocrystals (NCs) are a promising candidate for luminescence applications, but their poor tolerance to ambient environments limits their practical use. In this study, surface-modified CsPbBr3@silica nanoparticles (NPs) were synthesized using capping-ligand silanes and organic cross-linking agents, which improved the tolerance and stability of the NCs. The NPs exhibited high luminescent efficiency, small size (<50 nm), and showed selectivity and sensitivity for copper ion and sulfide ion as a fluorescent probe in ethanol.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Mengling Liao, Beibei Shan, Ming Li
Summary: The study investigates the photoluminescence properties of strongly quantum-confined CsPbBr3 perovskites with different dimensionalities, showing an overall increase in PL efficiency for 0D-QDs and 1D-QWs but negligible change for 2D-QPLs, with the observation of multiple local minima. The presence of two different types of trap states - a continuum of electron trap states and discrete localized trap states - is implied through a combined analysis of excitation wavelength dependence of PL efficiency, dimensionality dependence of excitonic transition, and time-resolved PL decays. Both trap states play important roles in 0D-QDs and 1D-QWs, while discrete localized trap states dominate in 2D-QPLs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Analytical
Jun Wang, Yi-Lin Hu, Rui-Xian Zhao, Qiu-Lin Wen, Jian Wang, Ni Yang, Jian Ling, Cheng Zhi Huang, Qiue Cao
Summary: In this study, luminescent CsPbBr3 PNCs were used for the detection of Hg2+ in water using liquid/liquid extraction method. The method showed linear measurement of Hg2+ concentration with a LOD of 35.65 nM, demonstrating potential for visualization of Hg pollution in water and promoting the application of PNCs in detecting important targets in water environments.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Physical
Kazushi Enomoto, Risa Oizumi, Naoya Aizawa, Takayuki Chiba, Yong-Jin Pu
Summary: Research shows that cesium lead halide perovskite nanocrystals, composed of the same halogen composition but with different sizes, can effectively suppress concentration quenching and exhibit high optical stability. The combination of blue-emitting and green-emitting nanocrystals in an energy donor-acceptor system demonstrates improved photoluminescence quantum yield in the film state, attributed to efficient suppression of concentration quenching through FRET from the blue-emitting nanocrystals to the green-emitting nanocrystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Suliman Eltayeb Elhadi, Chao Liu, Hamza Adam Haroon
Summary: The successful synthesis of europium-gadolinium co-doped titanium dioxide luminescence thin films using the sol-gel dip-coating method followed by thermal annealing was studied. The higher Eu3+ ions concentration affected the structure and optical properties of the thin films, which were characterized using various techniques. The thin films showed intense red and orange-red emission from Eu3+ ions and a reduction in the optical bandgap energy with increasing Eu3+ ion concentration.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Yunhui Wu, Jiurong Li, Xiujian Zhao, Xiao Gong
Summary: In this study, nickel-doped carbon dots (Ni-CDs) with tunable fluorescence emission were successfully synthesized using a simple one-step solvothermal method. The introduction of Ni enhanced the fluorescence intensity and caused a redshift. By mixing Ni-CDs with polyvinylpyrrolidone (PVP), the self-quenching effect of solid-state fluorescence was effectively avoided. Based on this, high-performance green, yellow, and red light-emitting diodes (LEDs) were constructed, demonstrating the potential of these carbon dots for solid-state lighting applications.
Article
Materials Science, Ceramics
Sihao Wang, Yunlan Guo, Chao Liu
Summary: Photo-catalytic active glass-ceramics hold great potential for addressing environmental issues and offer advantages compared to traditional photo-catalysts. The photo-catalytic properties of these glass-ceramics depend on the presence of photo-catalytic nanocrystals embedded within. Zn2TiO4, a stable intermediate phase of the TiO2-ZnO system, exhibits comparable photo-catalytic activities as traditional photo-catalysts TiO2 and ZnO. In this study, colorless and highly transparent glass-ceramics containing Zn2TiO4 nanocrystals were successfully prepared and their effects on microstructure, mechanical properties, photo-catalytic activities, and recyclability were investigated. The embedded Zn2TiO4 nanocrystals were found to be photo-catalytically active and efficient in degrading organic dyes, suggesting promising applications in organic pollutant degradation for glass-ceramics containing photo-catalytic nanocrystals.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Wenkai Gao, Jicheng Zhang, Chenjie Ji, Luyao Li, Jing Wang, Chao Liu, Jian Ruan, Jianjun Han
Summary: ZnO-(100-x) B2O3 (x = 45-64 mol%) glass-ceramics for ULTCC applications were prepared and studied for their crystallization behavior, sintering mechanism, microstructure and microwave dielectric properties. It was found that zinc boron binary glasses can be formed in the range of 45-73 mol% ZnO content, with 55 mol% ZnO content showing the highest glass-forming ability. The formation of Zn4B6O13 crystal in the glass at a lower temperature than in ceramics, along with the refinement of secondary structure, improved the microwave dielectric properties. The 55 ZnO -45 B2O3 glass-ceramic sintered at 640 degrees C for 5 h exhibited the optimum microwave dielectric properties, as well as high Vickers hardness and good chemical compatibility with Ag or Al electrode, making it a good candidate for ULTCC substrate materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Rongqing Jiang, Hanwei Wu, Danilo Manzani, Wenchao Zhang, Chao Liu
Summary: In this study, CdSe quantum dots (QDs) with tunable and narrow band intrinsic photoluminescence (PL) were precipitated in silicate glasses by adjusting the heat-treatment temperatures. Analysis revealed that the changes in PL properties were induced by the transformation of surface defects during heat-treatment. The relationship between surface defects and PL properties of CdSe QDs was uncovered, which facilitates their applications in LEDs, backlight displays, and lasers.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Wenchao Zhang, Jingjing Liu, Chao Liu
Summary: Lead sulfide quantum dots (PbS QDs) show unique performance in the near-infrared (NIR) range and can be in-situ precipitated in glass to improve stability and be compatible with silicon photonics. The absorption cross sections of PbS QDs at 1040 nm are found to be 4-13 x 10(-16) cm(2), with bi-and tri-exciton lifetimes of -60 and -10 ps, respectively. Furthermore, the study demonstrates broadband net gain in the 1500-1600 nm range and achieves a maximum gain time of around 20 ps and a gain coefficient of > 120 cm(-1) in single PbS QDs embedded glass. These findings are important for applications in fiber amplifiers, NIR lasers, and high-capacity telecommunication.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Juan Liu, Jingjing Liu, Wenchao Zhang, Kai Li, Chao Liu
Summary: Lead chalcogenide quantum dots with controlled composition, size, and optical properties are obtained in glasses through precipitation and thermal treatment. The addition of chalcogen elements in the glasses and the adjustment of heat-treatment conditions enable modulation of the properties of PbSexS1-x quantum dots. Increasing the concentration of S in the glasses reduces the relative fraction of Se in the quantum dots, while higher heat-treatment temperatures promote the enrichment of Se in the quantum dots. These alloyed quantum dots exhibit improved photoluminescence quantum yields and enhanced resistance to thermal quenching.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Qiufen Liu, Xuelei Chen, Jiahao Wu, Liming Zhang, Guanjie He, Shouqin Tian, Xiujian Zhao
Summary: In this paper, amorphous ZIF-8 was modified with carboxyl functional groups (H3BTC-ZIF-8) to load organic fluorescent dyes (R6G and C151) and prepare R6G/C151/H3BTC-ZIF-8 composite films. The enhanced fluorescence properties were attributed to the increased interactions between the dyes and H3BTC-ZIF-8, which reduced the ACQ effect and resulted in a white-light-emitting composite film with high photoluminescence quantum yield (PLQY). This strategy provides guidance for the development of white-light-emissive materials.
Article
Chemistry, Multidisciplinary
Zhilin Li, Qiaoqiao Li, Mengyan Cao, Zhihui Rao, Xinyu Shi, Liujiang Zhou, Xiujian Zhao, Xiao Gong
Summary: In this study, Sb3+-doped Cs2ZrCl6 crystals with excellent optical properties and stability were successfully synthesized. The crystals exhibited blue and orange-red emissions under 254 nm and 365 nm light, respectively, attributed to the presence of [ZrCl6]2- and [SbCl6]3- octahedra. The Cs2ZrCl6:xSb(3+) crystals with a PLQY of up to 52.5% showed potential for white light-emitting diode (WLED) fabrication.
Article
Nanoscience & Nanotechnology
Yongfei Hu, Hao Dong, Arnauld Robert Tapa, Javad Shamsi, Javad Shabani Shayeh, Albert Trokourey, Baoshun Liu, Xiujian Zhao, Yi Xie
Summary: In this study, a facile and scalable NaBr-assisted room-temperature aqueous phase procedure was developed for the synthesis of all-inorganic CsPbBr3-embedded PbBr(OH) with controlled hierarchical structures, excellent ambient stability, and strong activity for photocatalytic degradation of dyes in simulated organic wastewater. The CsPbBr3-embedded PbBr(OH) photocatalysts exhibited excellent photocatalytic activity for dye degradation under visible-light irradiation, surpassing that of commercial TiO2 and other perovskite-based materials. This work provides insights into the green synthesis of ultra-stable perovskite-based nanomaterials for photocatalytic degradation of organic pollutants and other promising water treatment technologies.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Ceramics
Jingjing Liu, Jiahui Wei, Chao Liu
Summary: Cooling rate has a significant effect on the structures and properties of glasses, potentially altering their chemical, physical, and mechanical properties, as well as their crystallization behaviors. This study investigates the impact of cooling rate on the crystallization and optical properties of glasses used to precipitate semiconductor nanocrystals, using sodium zinc silicate glasses as a typical example.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Yuzhou Hu, Ying Ye, Wenchao Zhang, Kai Li, Yao Zhou, Yudong Zhang, Zhao Deng, Jianjun Han, Xiujian Zhao, Chao Liu
Summary: Precise and efficient patterning of light-emitting structures in high resolution and full-color light-emitting diodes is achieved by light-induced inverted patterning of nanocrystals in glasses for micro-light-emitting diodes. This method involves the use of ultrafast laser pulse to induce structural destruction and amorphization of nanocrystals in glasses, resulting in inverted luminescent patterns. The high-throughput patterning of micrometer-scale, thermally stable, and highly photoluminescent structures in nanocrystals embedded glass provides a novel way to fabricate high-performance and ultrahigh-resolution color conversion layers for micrometer-scale light-emitting diodes.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Qiufen Liu, Mingfeng Zhang, Mengfan Lu, Ziao Wang, Gan Luo, Jianfeng Lu, Dawen Zeng, Xiujian Zhao, Shouqin Tian
Summary: A ZrO2-SiO2 composite film with enhanced mechanical properties was synthesized using a simple sol-gel method. Compared to a pure SiO2 film, the ZrO2-SiO2 film exhibited increased hardness and showed high transmittance gain and improved efficiency in perovskite solar cells with a Zr/Si mole ratio of 0.06.
Article
Chemistry, Physical
Jiurong Li, Jiancang Chen, Xiujian Zhao, Alberto Vomiero, Xiao Gong
Summary: Organosilane-grafted carbon dots (Si-CDs) were synthesized by hydrothermal method and can be uniformly dispersed in polyvinyl alcohol (PVA) matrix. Si-CDs/PVA thin-film LSCs exhibit excellent absorption in the UV spectral region and about 90% transmission in the visible range, with high stability and power conversion efficiency (PCE).
Article
Chemistry, Physical
Wenhao Zhao, Liping Wen, Ivan P. Parkin, Xiujian Zhao, Baoshun Liu
Summary: In this study, the Fermi-level (E-F) shift of the UV-illuminated Ag/TiO2 system under gaseous conditions was evaluated using in situ photoconductance and theoretical analysis. The role of Ag nanoparticles in storing and separating electrons was discussed, and it was found that the E-F of Ag/TiO2 is located deeper in the gap and is less affected by temperature compared to undecorated TiO2. The analysis showed that approximately 46 electrons can be stored in 10 nm Ag nanoparticles under the experimental conditions, and the blue-shift of localized surface plasmon resonance (LSPR) in Ag nanoparticles is not related to electron storage.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
