Article
Materials Science, Ceramics
Hui Ding, Zehua Liu, Yongfu Liu, Pan Hu, Peng Sun, Zhaohua Luo, Kefu Chao, Haochuan Jiang, Jun Jiang
Summary: In this study, Gd3Al3Ga2O12:1.5%Ce, xMg(2+) transparent ceramic phosphors were prepared and the effects of MgO on their microstructures and luminescent properties were investigated for the first time. An optimized TCP with 78.6% in-line transmittance and a luminous efficacy of 84.0 lm W-1 in LD lighting was achieved, showcasing its potential for next-generation LD lighting applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yanna Tian, Jie Chen, Xuezhuan Yi, Di Zhao, Zixin Weng, Yanru Tang, Hui Lin, Shengming Zhou
Summary: BaAl2O4-YAG: Ce composite ceramic phosphor shows excellent luminescent performances with great application potential in high brightness white LEDs/LDs lighting.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Anna Shakhno, Anton Markovskyi, Tetiana Zorenko, Sandra Witkiewicz-Lukaszek, Yevheniya Vlasyuk, Andres Osvet, Jack Elia, Christoph J. Brabec, Miroslaw Batentschuk, Yuriy Zorenko
Summary: This study investigates the crystallization and luminescent properties of a prospective Ca2YMgScSi3O12:Ce phosphor converter for white light LED. The formation of Ce3+ multicenters and the dependence of luminescent properties on layer thickness were studied, and the results show the importance of Ce3+ multicenters in enhancing the red emission band.
Article
Materials Science, Multidisciplinary
R. Hawrami, E. Ariesanti, A. Burger, H. Parkhe
Summary: This paper presents the crystal growth and characterization of new high-performance scintillators for nuclear and high energy physics research. The results show that Ce and Eu-doped Tl-based compounds exhibit good energy resolution and scintillation properties.
Article
Chemistry, Physical
Chun-Yun Wang, Otmar Melvin ten Kate, Shiro Funahashi, Masataka Tansho, Kenzo Deguchi, Naoto Hirosaki, Takashi Takeda
Summary: A new sialon compound with a unique crystal structure has been discovered, which exhibits white light emission upon UV light excitation. It is a promising phosphor material for UV-excitable white LED applications due to its simple composition and efficient emission.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Qinghong Meng, Qi Zhu, Xiaodong Li, Xudong Sun, Ji-Guang Li
Summary: By stabilizing the Gd3Al5O12 garnet structure through replacing 80% or more of Al3+ with Mg2+/Ge4+, a series of new orange-yellow-emitting phosphors were successfully developed for potential application in warm-white-light-emitting diodes (WLEDs). The study found that increasing content of Mg2+/Ge4+ can result in blue shifting of emission/excitation wavelength, decrease in the fluorescence lifetime of Ce3+, and narrow the band gap of the garnet host. The incorporation of Mg2+/Ge4+ was shown to impact the crystal structure, band structure, and local coordination, rationalizing the photoluminescence behaviors.
INORGANIC CHEMISTRY
(2021)
Article
Optics
Xiyue Zhang, Le Zhang, Chen Hou, Jian Kang, Yanbin Li, Bingheng Sun, Yang Li, Hao Chen
Summary: In this study, a series of LCMASG phosphor ceramics were fabricated and successfully achieved white light emission for high-power LEDs/LDs. The prepared phosphor ceramics exhibited excellent stability and high luminescent efficiency at high temperatures, along with red-shift and increased color index, making them suitable for lighting applications.
Article
Physics, Applied
Takumi Kato, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida
Summary: Ce-doped MgAl2O4 transparent ceramics were prepared by spark plasma sintering with different doping concentrations. The PL peak of 410 nm under excitation at 310 nm was observed in 0.01% Ce-doped MgAl2O4, while different PL excitation peaks were observed in 0.1%, 0.5%, and 1% Ce-doped MgAl2O4. The TSL glow curves showed three main peaks, corresponding to Ce3+ ions, Mn2+ impurities, and Mg2+ vacancies. The normalized TSL intensity of 0.5% Ce-doped MgAl2O4 decreased to 95% within the first 24 hours and remained stable within 1-5 days with measurement error. The minimum detectable dose for 0.5% Ce-doped MgAl2O4 was 0.5 μGy.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Jin Huang, Yiran Ni, Yuelong Ma, Yanbin Li, Zixuan Sun, Xiaoyu Zhu, Rui Wang, Tao Li, Xiaoqian Xi, Guocan Huang, Tianyuan Zhou, Ming Li, Haidong Ren, Le Zhang, Hao Chen
Summary: Transparent ceramics with high color rendering index are considered as excellent color converters for white LED and LD devices. By utilizing the component and structural designs between layers, composite structure TCs with high CRI were fabricated. The study shows that the optimized structure design can achieve higher CRI values and good luminescence properties.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Daiki Shiratori, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: Ce-doped Lu2O3-Al2O3-SiO2 glasses were prepared using a xenon image furnace and their physical, optical, and scintillation properties were investigated. The variations in the coordination environment of the different glass compositions were discussed in terms of the effects on photoluminescence properties. The characteristic shifts of the photoluminescence spectra were explained based on the crystal field effects and self-absorption effects due to the presence of Ce3+ and Ce4+.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Physics, Applied
Fumiya Nakamura, Prom Kantuptim, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: The study found that Ce-doped SrSiO3 crystals exhibited good scintillation and storage luminescence properties under X-ray and gamma-ray irradiation, with different doping concentrations resulting in varying light yields.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Instruments & Instrumentation
Biswajit Das, A. Kundu, R. Palit, V. Malik, P. Dey, D. Negi, S. K. Jadhav, A. T. Vazhappilly, B. S. Naidu
Summary: In this study, a Ce-doped GAGG scintillator crystal coupled with a multianode position sensitive photomultiplier tube (PSPMT) was used to quickly scan γ-ray detectors by reconstructing the image of the detectors with coincident photons. Experimental results showed that this method allowed for faster scanning compared to scanning by a point source. The scans were demonstrated for an old single-crystal coaxial reverse-electrode HPGe detector and an old clover HPGe detector, and the results were confirmed through simulation using the GEANT4 toolkit.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2023)
Article
Materials Science, Ceramics
Yuting Zhang, Huan Tu, Guoying Zhao, Jingshan Hou, Yufeng Liu, Xin Qiao, Zhongzhi Wang, Bo Li, Ji-Guang Li, Feng Wang, Yongzheng Fang
Summary: Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and enables precise control of emissions. In this study, the coordination field of Ce3+ ion was regulated through co-substitution, resulting in spectrum regulation in the yellow-green range. By using Ba2+-Si4+ cations to replace Y3+-Al3+ cations, the emission peak of the garnet phosphor was blue-shifted from 552 to 539 nm. The fluorescent films prepared using a low-temperature co-sintering process showed less erosion and even dispersion of the fluorescence crystals in the glass matrix. The warm white film prepared has potential application value in the whole spectra field.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Zeyuan Qian, Dong Li, Fangchen Hu, Pengjiang Qiu, Chicheng Ma, Chao Shen, Shanduan Zhang, Nan Chi, Xugao Cui, Pengfei Tian
Summary: This study investigates the size effect of UV-C LEDs on the entire communication system, including modulation bandwidth, channel attenuation, optical coupling, and energy efficiency. Smaller UV-C LEDs demonstrate higher data rates and energy efficiency in UV-C communication, attributed to larger optical modulation bandwidth, spectral efficiency, and signal-to-noise ratio at optimal operating currents.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Applied
Fumiya Nakamura, Prom Kantuptim, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: CaSiO3 crystals doped with Ce were developed and evaluated for their scintillation and TSL properties. The results showed that these crystals were highly sensitive to X-rays and exhibited good measurable sensitivity for personal dose monitoring.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Review
Nanoscience & Nanotechnology
Qin Hu, Xiaojuan Gong, Lizhen Liu, Martin M. F. Choi
JOURNAL OF NANOMATERIALS
(2017)
Article
Environmental Sciences
Ke Chen, Qing Zhu, Yiguang Qian, Ying Song, Jun Yao, Martin M. F. Choi
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2013)
Article
Chemistry, Applied
Haiyan Wang, Feng Feng, Yong Guo, Shaomin Shuang, Martin M. F. Choi
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2013)
Article
Engineering, Chemical
Guangming Wen, Zhongping Li, Martin M. F. Choi
JOURNAL OF FOOD ENGINEERING
(2013)
Article
Chemistry, Organic
Qiaoling Liu, Wei Bian, Heping Shi, Li Fan, Shaomin Shuang, Chuan Dong, Martin M. F. Choi
ORGANIC & BIOMOLECULAR CHEMISTRY
(2013)
Article
Biochemical Research Methods
Ting Wan, Fenglin Tang, Yanru Yin, Maoxue Zhang, Martin M. F. Choi, Xiupei Yang
Article
Nanoscience & Nanotechnology
Xiupei Yang, Zhengli Yang, Fenglin Tang, Jing Xu, Maoxue Zhang, Martin M. F. Choi
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2019)
Article
Chemistry, Physical
Chaofan Chai, Xiaohong Qiao, Lingling Zheng, Hubin Duan, Wei Bian, Martin M. F. Choi
Summary: PHBA, a main ingredient in the traditional Chinese medicine Gastrodia elata, has various pharmacological effects, making monitoring its levels significant for evaluating its pharmacokinetics and toxic effects. Nitrogen-doped carbon dots (NCDs) were designed for the sensitive detection of PHBA, showing success in detecting PHBA in blood and urine samples.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Chaofan Chai, Xuefang Yang, Xiaohua Yang, Chuan Dong, Wei Bian, Martin M. F. Choi
Summary: A MnO2-S, O-CNQDs nanoprobe was developed for rapid detection of trace amounts of GSH, showing potential biomedical applications and low biotoxicity. The non-fluorescence MnO2-S, O-CNQDs reacted with GSH to recover fluorescence, offering a useful tool for monitoring GSH in cancer cells.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Analytical
Mengting Zhang, Yulu Zhang, Mingyu Gan, Liping Xie, Jing Wang, Weihua Jia, Wei Bian, Shaomin Shuang, Martin M. F. Choi
Summary: In this study, fluorescent sulfur and oxygen co-doped graphitic carbon nitride quantum dots (S,O-CNQDs) were prepared and utilized as a probe for the detection of Cu2+. The S,O-CNQDs exhibited efficient fluorescence quenching by Cu2+ under optimum conditions, enabling their application in various samples such as tap water, lake water, human serum, urine, and living cells. The as-prepared S,O-CNQDs showed excellent properties and have potential for biological applications.
METHODS AND APPLICATIONS IN FLUORESCENCE
(2022)
Article
Chemistry, Analytical
Lingling Zheng, Yangyang Yan, Ning Wang, Mingli Li, Shaomin Shuang, Wei Bian, Martin M. F. Choi
Summary: Silver is widely used as a precious metal in various industries, but its large-scale production and waste emissions contribute to environmental pollution. Efficient and sensitive detection of silver ions (Ag+) in the water environment is crucial. This study successfully detected Ag+ in different environmental water samples and cells using sulfur-doped carbon nitride nanosheets (SCN Ns) as a fluorescent probe.
METHODS AND APPLICATIONS IN FLUORESCENCE
(2022)
Article
Chemistry, Analytical
Xiaohua Yang, Peigang Zhang, Jie Tan, Xuebing Li, Weidong Zhang, Wei Bian, Martin M. F. Choi
Summary: Graphene quantum dots (GQDs) with excellent stability, biocompatibility, and photoluminescence property have been attracting growing attention in the field of metal ions detection. Glutathione (GSH) functionalized boron doped graphene quantum dots (B-GQDs@GSH) were successfully synthesized, which showed stable bright blue fluorescence and were used for the detection of Fe3+. The application of B-GQDs@GSH for Fe3+ detection in water samples and their use in cell fluorescence imaging and intracellular determination of Fe3+ were demonstrated.
JOURNAL OF ANALYSIS AND TESTING
(2023)
Article
Materials Science, Multidisciplinary
Xiaohua Yang, Wenjing He, Mingyu Gan, Shaomin Shuang, Martin M. F. Choi, Wei Bian
Summary: In this study, a dual response ratiometric fluorescent probe was constructed for the rapid, on-site, sensitive, and selective detection of tetracycline (TC). The probe was synthesized by mixing sodium citrate (CitNa), europium ion (Eu3+), and sulfur and oxygen co-doped graphite phase carbon nitride quantum dots (S,O-C(3)N(4)QDs) solution in a specific proportion. The probe exhibited a significant decrease in blue fluorescence (lambda(em) = 445 nm) and an increase in red fluorescence (lambda(em) = 620 nm) in the presence of TC, allowing for ultra-sensitive detection from 0.25 to 120 μM, with a detection limit of 1.3 nM. A smartphone app monitoring platform based on test paper was also developed, demonstrating the potential application of the ratiometric fluorescent probe in medical and environmental fields.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shuyun Guo, Lingling Zheng, Wenjing He, Chaofan Chai, Xianghui Chen, Shaofang Ma, Ning Wang, Martin M. F. Choi, Wei Bian
Summary: A novel nanoprobe based on S,O-doped carbon nitride quantum dots was synthesized and demonstrated for the detection of folic acid (FA). The nanoprobe showed good biocompatibility and strong fluorescence at 360 nm excitation. It exhibited high sensitivity and selectivity towards FA in the concentration range of 5.0-83.3 μM, with a detection limit of 90 nM. The nanoprobe was successfully applied for FA detection in real samples with satisfactory recoveries and low relative standard deviation. The FA-S,O-CNQDs formed through a classical cross-linking reaction showed great potential in FA detection and targeted imaging of cancer cells.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Analytical
Lei Zhang, Qin Hu, Zhongping Li, Yan Zhang, Dongtao Lu, Shaomin Shuang, Martin M. F. Choi, Chuan Dong
ANALYTICAL METHODS
(2017)
