Article
Chemistry, Physical
Gibin George, Jacob Hayes, Candyce N. Collins, Jason E. Davis, Lei Yu, Yulin Lin, Jianguo Wen, Daryush Ila, Zhiping Luo
Summary: This study investigates the photoluminescence and cathodoluminescence characteristics of rare-earth-doped CaF2 nanoparticles and their composite monoliths with epoxy. The results show that the luminescence intensity increases as the particle size decreases for single-doped particles, but decreases for codoped particles. Additionally, Eu2+- and Tb3+-codoped CaF2 nanoparticles exhibit red emission.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Huimin Liu, Kezhi Li, Xin Zhang, Bing Liu, Lehua Qi, Xuemin Yin
Summary: Tapered nitrogen-doped SiC nanowires were grown vertically on carbon cloth using Si, SiO2, C, and dicyandiamide powders as raw materials via Fe-assisted chemical vapor deposition. The nanowires exhibited a high-density tapered morphology with increasing diameter from 120 nm to 1.30 μm and lengths of up to tens of micrometers. They were identified as 2H/3C-SiC mixed crystals and the tapered shape was influenced by the catalyst droplet, suggesting a Fe-assisted VLS mechanism. The PL spectrum showed a blue shift at 474 nm due to the special shape, defects, heterostructure, and quantum confinement effect of the nanowires.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Hang Chen, Yuhua Wang
Summary: A novel efficient blue-emitting phosphor, Eu2+ doped barium-containing silicate fluoride NaBa3Si2O7F, was synthesized with excellent luminescence and thermal stability, showing great potential for practical application in white light-emitting diodes. Furthermore, the phosphor also exhibited good cathodoluminescence properties for potential use in field emission displays.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Xuekun Tian, Xiaoyu Chen, Chengliang Ma, Kai Su, Qiankun Geng, Fei Zhao, Xinhong Liu
Summary: This work proposes a green method for synthesizing SiC nanowires via chemical vapor deposition using coconut shell and silicon as raw materials. The use of coconut shell as a carbon source reduces the synthesis temperature of SiC. The synthesized SiC nanowires exhibit a core-shell structure with a thin SiO2 layer on the outer shell, and they emit strong violet-blue light at a certain temperature, showing good potential for opto-electronic device applications.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Li Yang, Jiaqi Wang, Yiyi Zhang, Mei Chen, Xuejiao Wang, Chuang Wang, Qiushi Wang, Cailong Liu
Summary: Si(3)N(4) nanowires doped with rare earth ions were successfully synthesized using plasma assisted direct nitridation method. The prepared nanowires were characterized and their properties were investigated. This study provides an effective strategy for doping large-size functional atoms in Si(3)N(4) nanowires.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
M. Nazarov, D. Spassky, M. G. Brik, B. Tsukerblat
Summary: This paper reports the luminescence properties of nanosized undoped and Eu2+ (1%) doped SrAl2O4 phosphors. The phosphors were prepared by combustion method and characterized using photo luminescence and cathodoluminescence analyses. The energy level scheme of the doped crystal and the nature of defects in undoped phosphor were proposed and discussed. The shape-function of the vibrationally assisted band was analyzed within a simplified model, and an approximate approach to describe the shape of the bands was proposed.
Article
Materials Science, Ceramics
V. A. Kravets, E. V. Dementeva, E. V. Popova, B. E. Burakov, M. V. Zamoryanskaya
Summary: The purpose of this study was to develop glasses for encapsulation of radioactive materials. Borosilicate-based glass systems R7/T7 (B2O3-SiO2-Al2O3-Na2O-CaO) doped with Eu3+ with different concentrations of activator were investigated. The composition of the glasses obtained was analyzed using electron-probe microanalysis technique. The optical properties of the glasses were studied using cathodoluminescence, photoluminescence, and absorption spectra, and the range of optimal activator concentration was determined.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Ruiang Guo, Kaiyue Wang, Yuming Tian, Hongxing Wang
Summary: In this study, the luminescence properties and phonon sidebands of nitrogen vacancy (NV) centers in high and low nitrogen diamonds after electron irradiation and annealing were investigated. It was found that the phonon sidebands were caused by phonon emission behavior during the induced transitions from laser excitation, with estimated phonon energies for NV0 and NV- centers. As measurement temperature increased, the likelihood of non-radiative transitions resulting in the absence of phonon sidebands also increased, leading to the synchronous quenching of NV luminescence. The lattice environment and measurement temperature play roles in the manifestation of phonon sidebands of NV centers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Reena Suryawanshi, Ramsingh Kurrey, Sushama Sahu, Kallol K. Ghosh
Summary: A simple and facile method for the synthesis and functionalization of graphene quantum dots (GQDs) using doping and co-doping has been reported. The optical properties and stability of the functionalized GQDs were studied, and the quantum yields were enhanced under optimized conditions. A B,N-GQDs sensor was developed for the detection of paraoxon in water samples, showing a good linear range and low detection limit.
Article
Chemistry, Physical
Cheng Wang, Tiancheng You, Yunfei Zhang, Ming Song, Zhaozhong Huang, Weidong Xia
Summary: In this study, N-doped SiC nano-powders were synthesized through pyrolysis in Ar/N2 plasma atmosphere. The results showed that N-doping could effectively adjust the dielectric properties and microwave absorption ability of SiC nano-powders, while also exhibiting good photoluminescence performance. Therefore, these N-doped SiC nano-powders hold potential applications as microwave absorbers and light-emitting sources.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Po-Heng Sung, Hsi-Kai Yen, Shu-Meng Yang, Kuo-Chang Lu
Summary: We report an efficient method of synthesizing undoped and K-doped rare cubic tungsten trioxide nanowires via thermal evaporation of WO3 powder. The reproducible and stable WO3 nanowires were obtained without using a catalyst. The growth process is low-cost and was conducted in a three-zone horizontal tube furnace with various processing parameters studied. The study also investigated the effects of potassium doping on the physical properties of the nanowires, revealing promising applications for sensors, field emitters, and light-emitting diodes.
Article
Engineering, Environmental
Jonnalagadda Madhavi, V. Prasad, Kakarla Raghava Reddy, Ch. Venkata Reddy, Anjanapura Raghu
Summary: This study successfully synthesized a Ni-doped ZnS-CdS hybrid composite and investigated its structural, morphological, optical, and magnetic properties using various analytical techniques, confirming its green light emission and room temperature ferromagnetism.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(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)
Article
Chemistry, Inorganic & Nuclear
Jannat Hammouche, Kais Daoudi, Soumya Columbus, Rania Ziad, Krithikadevi Ramachandran, Mounir Gaidi
Summary: The study investigated the photocatalytic degradation of organic dyes using nickel doped zinc oxide decorated silicon nanowires, showing that nickel doping slightly enhances the degradation efficiency. The developed structure stands as promising candidates as efficient, cost-effective and reusable photocatalytic systems.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Mogahid H. M. Abdelrehman, Robin E. Kroon, Abdelrhman Yousif, Hassan A. A. Seed Ahmed, Hendrik C. Swart
Summary: The structural and optical properties of Yb3+ and Er3+ co-doped Gd2O3:Bi3+ phosphor were studied. The addition of Yb3+ ions increased the optical bandgap of Gd2O3 and enhanced the near-infrared emission. The emission intensities of Yb3+ and Er3+ ions were significantly enhanced after Bi3+ doping. The results suggest that these phosphors have the potential to improve photovoltaic conversion efficiency through spectral modification and utilizing the down-conversion and upconversion processes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Ruofei Jia, Jiaxin Li, Huanyu Zhang, Xiujuan Zhang, Shuiling Cheng, Jing Pan, Chaoqiang Wang, Azhar Ali Ayaz Pirzado, Huanli Dong, Wenping Hu, Jiansheng Jie, Xiaohong Zhang
Summary: Highly efficient linearly polarized light-emitting diodes (LP-LEDs) are demonstrated using 2,6-diphenylanthracene (DPA) single crystals (SCs) as intrinsically polarized emitters. The LP-LEDs exhibit a maximum external quantum efficiency (EQE) of 3.38%, which is the highest among reported organic SC-based LEDs. Furthermore, an interchip polarized optical communication system based on organic SCs is achieved for the first time.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Hao Wu, Yi-Zhong Shi, Kai Wang, Jia Yu, Xiao-Hong Zhang
Summary: Thermally activated delayed fluorescence (TADF) materials have attracted enormous attention and their mechanism has been extensively studied. It has been discovered that some donor-acceptor (D-A) type TADF emitters exhibit dual stable conformations in the ground state, and the distribution of these conformations significantly affects their physical properties and device performances. Therefore, a professional analysis and summary of the relationship between molecular structures and performances are crucial. In this review, the mechanism and properties of TADF emitters with conformational isomerism are summarized, recent progress in their various applications is classified, and an outlook on their perspectives is provided.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Environmental
Chao Lu, Xinpeng Yu, Yunxuan Chen, Xi Chen, Xiaohong Zhang
Summary: Flexible piezoionic sensors are being recognized as an important tool for non-invasive human health monitoring. The discovery of giant piezoionic effects in ultrathin MXene nanosheets has provided a solution to the weak piezoionic effects in general sensing materials. These sensors show high sensitivity for physiological signals and can accurately detect sleep apnea in real-time, which is crucial for sleep-related disorders. The development of smart medical instruments will be accelerated with the advancement of sensitive health detection using giant piezoionic effects.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Hui Wang, Xi Zhang, Lu Zhou, Xiao-Chun Fan, Ying-Chun Cheng, Jia Yu, Jia-Xiong Chen, Kai Wang, Xiao-Hong Zhang
Summary: By leveraging the participation of localized excited triplet states from both donor and acceptor segments, an ingenious molecular design was employed to significantly boost the reverse intersystem crossing (RISC) rates of red thermally activated delayed fluorescence (TADF) emitters. The molecule DBBPZ-IDPZ showed 15.7 times accelerated RISC rate and a higher photoluminescence quantum yield of 98.1% compared to the control molecule. The red OLED based on DBBPZ-IDPZ exhibited a significantly improved external quantum efficiency of 26.0%, which is approximately triple that of the control device. This work provides new insights into the molecular design tactic of high-performance red TADF OLEDs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Electrochemistry
Ru Wang, Minglei Li, Yue Liu, Gaole Dai, Tingting Wu, Wei He, Shunan Feng, Xiaohong Zhang, Yu Zhao
Summary: In this study, a new strategy is proposed to tune the redox potentials of bipolar redox-active organic molecules (ROMs) with fused conjugation by incorporating electron-withdrawing or electron-donating groups. Three designed bipolar ROMs with fused conjugation based on phenoxazine derivatives exhibit highly reversible redox reactions in the given electrolyte systems. The symmetric organic redox flow batteries (ORFBs) based on these bipolar ROMs maintain decent electrochemical stability when cycled in a compatible electrolyte.
ELECTROCHEMISTRY COMMUNICATIONS
(2023)
Article
Optics
Huanyu Zhang, Xiujuan Zhang, Chaoqiang Wang, Tingxiu Yu, Geng He, Ruofei Jia, Azhar Ali Ayaz Pirzado, Jie Lin, Jingsong Huang, Jun Peng, Jiansheng Jie, Xiaohong Zhang
Summary: A nonstoichiometric composition tuning strategy has been developed to improve the device performance of perovskite single-crystal light-emitting diodes (SC-PeLEDs) by enhancing the crystal quality, reducing trap density, and elevating the energy level of the perovskite single crystals.
LASER & PHOTONICS REVIEWS
(2023)
Article
Energy & Fuels
Siwei Gu, Zheng Lu, Shuai Zou, Chengkun Wu, Chen-wei Peng, Mengfei Ni, Zhenzhen Chen, Hao Huang, Hua Sun, Haibo Wang, Xiaohong Zhang, Xiaodong Su
Summary: This study presents a solid strategy to prepare bifunctional SiO2 coatings (BSCs) with both antireflection and luminescence downshifting properties by in situ generating YVO4:Eu3+, Bi3+ phosphors in SiO2 antireflection coatings (ARCs). The self-prepared precursor solution of the downshifting phosphors is added to a mixture of commercial SiO2 sol solution and ethanol to uniformly coat the surface of quartz glass, resulting in a novel composite porous SiO2 coating containing in situ generated YVO4:Eu3+, Bi3+ phosphors. The SiO2@YVO4:Eu3+, Bi3+ BSCs can effectively convert ultraviolet (UV) region photons to visible photons, improving the photoelectric conversion efficiency (PCE) of tunnel oxide passivated contact solar cells and the UV stability of silicon heterojunction solar cells.
Article
Energy & Fuels
Chunfang Xing, Wenbo Gu, Kun Gao, Beibei Shao, Conghui Jiang, Guilin Bai, Dacheng Xu, Xinyu Wang, Kun Li, Zheheng Song, Zhaojun Su, Jie Mao, Xinyu Zhang, Peiting Zheng, Wei Zhang, Xiaohong Zhang, Yusheng Wang, Xinbo Yang, Baoquan Sun
Summary: In this study, thermally evaporated wide-bandgap strontium oxide (SrOx) was used as an electron-selective contact to improve the performance of crystalline silicon (c-Si) solar cells. The lower work function of SrOx achieved a downward band bending at the n-type c-Si/SrOx interface, enabling electron-selective transport. The thin SrOx films provided moderate surface passivation and low contact resistivity, leading to a champion power conversion efficiency of 20.0% on the n-type c-Si solar cell.
Article
Chemistry, Multidisciplinary
Hui Wang, Xiao-Chun Fan, Jia-Xiong Chen, Ying-Chun Cheng, Xi Zhang, Hao Wu, Xin Xiong, Jia Yu, Kai Wang, Xiao-Hong Zhang
Summary: A novel double boron-containing MR-TADF paradigm has been proposed, which achieves high-performance solution-processable OLEDs. The developed molecule exhibits a bright sharp emission peak, high photoluminescence quantum yield, and excellent organic solubility. This research has achieved impressive results in solution-processed devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hui Chen, Yihao Shi, Jiahao Qin, Guangshang Sheng, Cheng Zhang, Bingchang Zhang, Xiaohong Zhang
Summary: Ag-assisted chemical etching (AgACE) is a low-cost method to produce silicon nanowires (SiNWs) for photoelectric applications. The structure parameters, including array density, of SiNWs have a significant impact on their optical and photoelectric properties. This study experimentally investigates the effect of array density on the optical and photoelectric properties of SiNWs.
Review
Chemistry, Multidisciplinary
Xiaochun Fan, Xiaoyao Hao, Feng Huang, Jia Yu, Kai Wang, Xiaohong Zhang
Summary: With the increasing demand for ultra-high-resolution displays, the ITU has introduced the new color gamut standard, ITU-R Recommendation BT.2020. Organic light-emitting diodes (OLEDs) are widely used in display technologies but face challenges in meeting the BT.2020 standard. Thermally activated delayed fluorescence (TADF) emitters show promise due to their high exciton utilization, and research is being conducted to develop TADF emitters that meet the BT.2020 standard. This article provides a comprehensive overview of recent advancements in TADF emitters with CIE coordinates surpassing NTSC and approaching BT.2020 standards.
Article
Energy & Fuels
Cao Yu, Kun Gao, Chen-Wei Peng, Chenran He, Shibo Wang, Wei Shi, Vince Allen, Jiteng Zhang, Dengzhi Wang, Gangyu Tian, Yifan Zhang, Wenzhu Jia, Yuanhong Song, Youzhong Hu, Jack Colwell, Chunfang Xing, Qing Ma, Huiting Wu, Liangyuan Guo, Gangqiang Dong, Hao Jiang, Haihong Wu, Xinyu Wang, Dacheng Xu, Kun Li, Jun Peng, Wenzhu Liu, Daniel Chen, Alison Lennon, Xinmin Cao, Stefaan De Wolf, Jian Zhou, Xinbo Yang, Xiaohong Zhang
Summary: Reducing parasitic absorption and shadowing losses is essential for unlocking the full performance potential of silicon heterojunction solar cells. This study addresses these challenges by developing a high-frequency plasma-enhanced chemical vapour deposition system and seed-free copper plating technique, resulting in improved efficiency and feasibility of mass production.
Article
Chemistry, Multidisciplinary
Meng-Yuan Chen, Feng Huang, Hao Wu, Ying-Chun Cheng, Hui Wang, Ya-Nan Hu, Xiao-Chun Fan, Jia Yu, Kai Wang, Xiao-Hong Zhang
Summary: Atomically separated frontier molecular orbital (FMO) distribution is crucial for achieving narrowband emissions in multiple resonance (MR)-type thermally activated delayed fluorescence emitters. This study explores how direct donor/acceptor decoration enhances atomic FMO separation while avoiding bonding features. Two MR derivatives are synthesized by integrating MR frameworks at different sites, and their emission characteristics and performance in organic light-emitting diodes (OLEDs) are compared.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Hui Wang, Jia-Xiong Chen, Lu Zhou, Xi Zhang, Jia Yu, Kai Wang, Xiao-Hong Zhang
Summary: This study presents the construction of a high-performance deep-red/near-infrared thermally activated delayed fluorescence (TADF) emitter, which exhibits excellent electroluminescence efficiency due to the introduction of an advanced dual-locked triarylamine donor (D) unit. The emitter shows redshifted emission, enhanced photoluminescence quantum yield (PLQY), and aggregation-induced emission (AIE) properties, leading to record-high efficiencies in deep-red/near-infrared TADF OLEDs.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Xiao-Chun Fan, Kai Wang, Yi-Zhong Shi, Dian-Ming Sun, Jia-Xiong Chen, Feng Huang, Hui Wang, Jia Yu, Chun-Sing Lee, Xiao-Hong Zhang
Summary: In this study, two new thermally activated delayed fluorescence (TADF) emitters were synthesized, and three effective approaches for enhancing the efficiency of nondoped OLEDs were combined. These emitters were designed to have high steric hindrances to minimize concentration quenching, and they showed stable conformations in solid films, allowing effective doping in the matrix. The resulting OLEDs achieved nearly 100% exciton utilization, over 30% external quantum efficiencies, and ultralow efficiency roll-off at high brightness, which are unprecedented in reported nondoped OLEDs.
