Article
Physics, Condensed Matter
Yang Yu, Sai Xu, Muhan Jiang, Ruixin Song, Jie Li, Yuefeng Gao, Xizhen Zhang, Xiangping Li, Hongquan Yu, Baojiu Chen
Summary: In this study, upconversion core-shell nanoparticles with dual functions of temperature sensing and photothermal conversion were successfully synthesized using a high-temperature thermal decomposition method. Both the designed core-shell nanoparticles and bare core nanoparticles exhibited similar excellent temperature sensing performances. Furthermore, it was found that the photothermal conversion ability of the core-shell UCNPs was greatly improved by coating with the NaYF4: Sm3+/Yb3+ outer shell.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Mingzhou Meng, Rui Zhang, Xinmeng Fa, Jianghua Yang, Zhenlong Cheng, Anees A. Ansari, Jun Ou, Christian Wurth, Ute Resch-Genger
Summary: NaYF4:Yb3+/Tm3+@NaYF4:Yb3+/Er3+ nanoparticles doped with Tm3+ and Er3+ were prepared by the solvothermal method, resulting in increased fluorescence intensity and simultaneous temperature measurements on multiple thermocouple energy levels.
Article
Chemistry, Multidisciplinary
Tomasz Grzyb, Piotr Kaminski, Dominika Przybylska, Artur Tyminski, F. Sanz-Rodriguez, Patricia Haro Gonzalez
Summary: This study synthesized nanoparticles based on host compound NaYF4 with core@shell structures, utilizing different laser wavelengths for excitation and studying emission properties in detail, demonstrating adjustable up-conversion emission and multifunctionality. The impact of doping ions on the emission of NPs was explored, revealing various absorption and emission processes under different laser excitations.
Article
Chemistry, Multidisciplinary
Raheel Ahmed Janjua, Obaid Iqbal, Muhammad Aqeel Ahmed, Abdullah A. Al-Kahtani, Sara Saeed, Muhammad Imran, Abdul Ghafar Wattoo
Summary: A comprehensive strategy has been developed to construct nano-sized homogeneous and heterogeneous core/shell structures of NaYF4 host, with pure cubic nanocrystals synthesized with different average sizes. The study determined temperature and time thresholds for hexagonal nucleation and achieved controlled core/shell structures of different phases. Upconversion emission spectra showed significant enhancements in integrated intensities for different core/shell structures compared to the core alone.
Article
Chemistry, Multidisciplinary
Zhenlong Cheng, Mingzhou Meng, Jiaoyu Wang, Zhuoyue Li, Jiao He, Hao Liang, Xin Qiao, Yuanli Liu, Jun Ou
Summary: Non-contact optical temperature sensors with high temperature resolution, relative thermal sensitivity, fast temporal response, and long-term optical stability are in high demand. This study investigates the temperature sensing properties of NaYF4:Yb3+/Ho3+/Tm3+ upconversion nanoparticles prepared by a solvothermal method. The samples exhibit strong upconversion luminescence and have good potential for optical temperature measurement.
Article
Chemistry, Physical
Qixiao Wu, Zheng Xu, S. Wageh, Ahmed Al-Ghamdi, Suling Zhao
Summary: A series of NaYF4:Yb3+, Tm3+@NaYF4:Yb3+, Er3+ core@shell nanocrystals with different sensitizer contents were synthesized to investigate the impact of sensitizer Yb3+ on upconversion luminescence. The results showed that as the Yb3+ content increased, the green upconversion luminescence decayed faster than the red, and the red to green upconversion luminescence ratio significantly increased in samples highly doped with Yb3+.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Uliana Kostiv, Marta Maria Natile, Daniel Jirak, Denisa Pulpanova, Klara Jirakova, Magda Vosmanska, Daniel Horak
Summary: Upconverting nanoparticles with gadolinium enrichment were synthesized and characterized for bimodal imaging purposes. A 2.5 nm NaGdF4 shell grown on the core nanoparticles led to a 26-fold enhancement in emission under excitation, impacting both T-1 and T-2 relaxation times. PEG-Ner modification significantly increased the relaxivities of the nanoparticles, demonstrating their potential as a diagnostic tool for magnetic resonance imaging.
Article
Materials Science, Multidisciplinary
Xuezhu Sha, Hui Zheng, Baojiu Chen, Jinsu Zhang, Xiangping Li, Sai Xu, Jiashi Sun, Xizhen Zhang, Yongze Cao, Yanqiu Zhang, Xin Wang, Yuhang Zhang, Haiping Xia
Summary: This study synthesized core-shell nanoparticles with both photothermal conversion and temperature detection capabilities, finding that different coatings did not significantly affect their performance. The photothermal conversion capacity increased with higher Yb3+ concentration and 980 nm laser excitation power.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Instruments & Instrumentation
Jurgis Grube, Jelena Butikova
Summary: This study investigates the temperature dependence of Tm3+ up-conversion luminescence in NaYF4:Tm3+, Yb3+ core-shell nanoparticles. The results show that the intensity of Tm3+ up-conversion luminescence increases significantly at lower temperatures, emitting intense blue and ultraviolet radiation. Measurements of Tm3+ up-conversion luminescence spectra at different temperatures reveal three quenching mechanisms associated with temperature variations.
APPLIED SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Sen Yang, Yinghao Wei, Qi Wang, Zhijun Sun, Ai-Hua Li
Summary: In this study, a high-performance microcrystal based on heavily doped Tm3+ was designed to achieve self-trapped excitons and Tm3+ near-infrared emission. The application of its luminescent properties in temperature sensing was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Christian Wurth, Bettina Grauel, Monika Pons, Florian Frenzel, Philipp Rissiek, Kerstin Rucker, Markus Haase, Ute Resch-Genger
Summary: This study systematically analyzed the dependence of UC luminescence quantum yield on the dopant concentration in solid NaYF4:Yb,Er/NaYF4:Lu upconversion core/shell nanocrystals. The results showed that high Yb3+ concentrations can increase the particle absorption cross section and brightness of UCNC, while high Er3+ concentrations can decrease the luminescence brightness.
Article
Chemistry, Multidisciplinary
Muhammad Khuram Shahzad, Usman Farooq, Adil Raza, Ghulam Abbas, Muhammad Ikram, Yundong Zhang
Summary: In this study, silver island modified up-conversion nano-particle thin films were prepared and successfully enhanced their emission intensity. By preparing microfibers and analyzing their performance under laser excitation, it was shown that they can be used to construct new nano-thermometers.
Article
Engineering, Environmental
Simranjit Singh, Shivanand H. Nannuri, Sajan D. George, Swaroop Chakraborty, Anurag Sharma, Superb K. Misra
Summary: A novel tri-dopant upconversion nanoparticle system was synthesized for dye degradation studies, with neodymium (Nd3+) dopant enhancing the efficiency of dye degradation. X-ray diffraction studies showed that the presence of Nd3+ led to a reduction in particle size. The presence of Nd3+ widened the absorption spectra of upconversion nanoparticles in both the visible and near-infrared range.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Mingzhou Meng, Rui Zhang, Xinmeng Fa, Jianghua Yang, Zhenlong Cheng, Xin Qiao, Jun Ou, Christian Wurth, Ute Resch-Genger
Summary: NaYF4:Yb3+/Tm3+@NaYF4:Ce3+/Eu3+ nanoparticles with dual-mode upconversion/downconversion were prepared and showed enhanced fluorescence intensity and temperature measurement properties.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jingyun Li, Yuxiao Wang, Xueru Zhang, Liang Li, Haoyue Hao
Summary: The Er3+/Tm3+/Yb3+ co-doped NaYF4 phosphors studied in this research show potential applications for temperature determination in the visible and the first biological window ranges.
Article
Materials Science, Multidisciplinary
Anjun Huang, Chang-Kui Duan, Ka-Leung Wong, Peter A. Tanner
Summary: This study reports the near infrared downshifting of erbium-doped Cs2NaBiCl6 particles of micron and nanoparticle sizes under ultraviolet excitation. The emission wavelength can be switched from sharp to broad band by selective excitation, and the emission intensity can be tuned by choice of solvent.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
Yunlin Yang, Bibo Lou, Yiyi Ou, Fang Su, Chong-Geng Ma, Chang-Kui Duan, Pieter Dorenbos, Hongbin Liang
Summary: Ce3+-doped LiSr4(BO3)3 phosphors were synthesized using a high-temperature solid-state reaction method, and their structure and luminescence properties were investigated. The results showed that Ce3+ ions preferentially occupied the Sr2+ sites in LiSr4(BO3)3, and concentration quenching did not occur. Thermal ionization was found to be the dominant mechanism for thermal quenching of Ce3+ luminescence.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Fengfeng Chi, Liangliang Pan, Bin Jiang, Zhangchao Ji, Jie Cheng, Bing Wang, Xiantao Wei, Shengli Liu
Summary: Tb3+ and Eu3+ doped La4GeO8 phosphors with multicolor emission were synthesized and their photoluminescence properties were investigated. The energy transfer from Tb3+ to Eu3+ in La4GeO8 is attributed to quadrupole-quadrupole interaction. The La4GeO8:0.07Tb3+,0.01Eu3+ phosphor exhibits good thermal stability with activation energies of 0.186 eV and 0.187 eV for Tb3+ and Eu3+ ions, respectively. By adjusting the content ratio of Eu3+ to Tb3+, the La4GeO8:Tb3+,Eu3+ phosphors can achieve multicolor luminescence and tunable chromaticity. These findings suggest that La4GeO8:Tb3+,Eu3+ phosphors are promising for solid-state lighting applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Fengfeng Chi, Zhangchao Ji, Qian Liu, Bin Jiang, Bing Wang, Jie Cheng, Bin Li, Shengli Liu, Xiantao Wei
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Liang Li, Qianwen Cao, Jing Xie, Wenming Wang, Jiajia Wang, Yan Pan, Xiantao Wei, Yong Li
Summary: Researchers successfully prepared a far-red emitting phosphor doped with Mn4+ ions, which can be efficiently excited and emit intense far-red light. The crystalline properties and luminescence performance were studied in detail, and the crystalline field effect and concentration quenching mechanism of Mn4+ ions in the matrix were explored. The phosphor exhibited high internal quantum efficiency, color purity, and activation energy, making it suitable for the preparation of LED devices for plant cultivation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Wenming Wang, Liang Li, Hongmei Chen, Xiantao Wei, Juanying Jia, Yan Pan, Yong Li
Summary: In this study, Yb3+/Er3+ co-doped YOF glass ceramics were prepared and their luminescence and temperature sensing properties were investigated under 980 nm excitation. The fluorescence intensity ratio (FIR) of the thermal couple energy level (TCEL) and non-thermal couple energy level (NTCEL) was used to evaluate the temperature sensing sensitivity. The increase in pump power resulted in a decrease in relative sensitivity (SR) due to the thermal effect and increased rate of energy transfer and non-radiative relaxation process between dopants and host. The maximum relative sensitivity of this sample reached 1.59 x 10-2 K-1 at 310 K with a pump power of 0.2 W, indicating the prospective application of this glass ceramic in optical thermometry.
Article
Physics, Applied
Zhi Cheng, Xiangyu Ye, Jiandong Wu, Pei Yu, Cheng-Jie Wang, Mengqi Wang, Changkui Duan, Ya Wang, Fazhan Shi, Changlin Tian, Hongwei Chen, Pengfei Wang, Jiangfen Du
Summary: Nanoscale sensing and imaging of electromagnetic field can be achieved by utilizing the forbidden magnetic dipole transition of a single shallow nitrogen-vacancy center in diamond. The detection of rf electric fields at frequencies ranging from 13.85 MHz to 2.02 GHz is successfully demonstrated, with a sensitivity of 265 V cm-1 Hz-1/2 for amplitude measurement and a standard deviation of 0.2 degrees for phase measurement. The potential applications of such nanoscale sensor in science and technology are discussed.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Mingzhe Liu, Hei-Yui Kai, Anjun Huang, Chang-Kui Duan, Ka-Leung Wong, Peter A. Tanner
Summary: First-principles calculations were conducted to investigate the doping of bismuth and iron in the lattices of BaAl12O19 (BAO) and CaAl12O19 (CAO). Experimental data for the optical spectra of CAO were provided to support the calculation results. The presence of trace impurities in undoped CAO samples, such as Mn4+, was observed to contribute to luminescence bands. The emission wavelengths of around 810 nm in CAO were found to be associated with Fe3+ and Bi3+ dopants.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Zhicheng Liao, Liting Qiu, Xiantao Wei, Yonghu Chen
Summary: A novel heat-quenching resistant phosphor Ba2YAlO5 doped with Bi3+ was successfully synthesized using the traditional high temperature solid-state method. The crystal structure and luminescence properties were characterized by XRD, SEM, DR spectra, and PL spectra. The phosphor exhibited a broad-band yellow light with a peak at 571 nm and a FWHM of 125 nm under 324 nm excitation. The integrated emission intensity at 560 K was still close to that at room temperature, indicating its excellent thermal stability. Ba2YAlO5: Bi3+ also showed yellowish white light with high color temperature, making it a promising fluorescent powder for high-power devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Optics
Jun Wen, Jing Gao, Guisheng Jiang, Xiaoxiao Huang, Qiang Wang, Chenlong Wei, Lixin Ning, Chang-Kui Duan
Summary: Theoretical studies were conducted to investigate the thermodynamic stabilities and luminescent properties of defects and lanthanide ions in BaZrSi3O9, aiming to gain a better understanding of the luminescence mechanisms in undoped and lanthanide-doped BaZrSi3O9.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Mingzhe Liu, Chang-Kui Duan, Ruijie Hao, Min Yin
Summary: A variety of halide perovskites doped with ns2 ions have been studied. First-principles calculations were performed on Cs2SnCl6 and Cs2HfCl6 to explore self-trapped excitons, defects, and luminescent centers. The results provide a consistent understanding of the experimental phenomena and reveal differences between Cs2SnCl6 and Cs2(Hf/Zr)Cl6, which can benefit the design and optimization of metal halide perovskites.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Multidisciplinary
Han Xie, Yanan Li, Rui Li, Yinchun Leng, Yiming Chen, Lei Wang, Dingjiang Long, Xiang Bian, Chang-Kui Duan, Peiran Yin, Pu Huang, Jiangfeng Du
Summary: By utilizing an engineering conductive geometry scheme, we effectively reduce the mechanical dissipation of a diamagnetically levitated oscillator made of pyrolytic graphite, improving its levitation capability. Through experimental demonstration, we show that the specially designed conductive geometry significantly reduces eddy current damping, with a higher reduction factor for denser engraving patterns. Under high vacuum and room temperature conditions, we reduce eddy current damping by a factor of 50. This work presents a new approach to achieve ultralow mechanical dissipation and strong levitation capability in diamagnetically levitated oscillators, providing a candidate platform for studying a broad range of fundamental physics.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Haoming Xu, Weiguo Jing, Mingzhe Liu, Min Yin, Chang-Kui Duan
Summary: The abnormal self-reduction of trivalent lanthanides in borates, particularly in SrB4O7, has been reported for many years, but only an explanatory description has been provided. Through calculations of formation energies in SrB4O7, we offer an explanation for the mechanisms behind the self-reduction phenomenon. Additionally, we present the trends of the binding energies of divalent lanthanides, which align well with and support the results obtained by extrapolating experimental data using the semiempirical chemical shift model. Our findings demonstrate that calculations conducted using the supercell method and projector augmented wave pseudopotentials can effectively interpret reduction and charge-transfer phenomena, and serve as a basis for the design of lanthanide-doped optical materials.
Article
Materials Science, Multidisciplinary
Zhaoyang Feng, Chang-Kui Duan
Summary: In this study, first-principles calculations were used to investigate the luminescence properties of four different ternary oxide materials, namely (Sr/Ca)Sb2O6, (Sr/Ca)2Sb2O7, (Sr/Ca)SnO3, and (Sr/Ca)Ga2O4, doped with bismuth ions. The effects of bismuth doping on the materials' luminescence properties were analyzed by studying intrinsic defects and self-trapped holes. The transitions associated with bismuth ions in different materials were also identified. The insights gained from this study are important for understanding the luminescence mechanisms of insulating bismuth-doped ternary oxides.
Article
Chemistry, Inorganic & Nuclear
Liang Li, Qianwen Cao, Jing Xie, Wenming Wang, Yubei Wang, Hongmei Chen, Zhongyuan Li, Yan Pan, Xiantao Wei, Yong Li
Summary: Altering the local symmetry of an activator by lattice tuning is an effective strategy to optimize the luminescence performance of phosphors. In this study, a novel Mn4+-activated double perovskite phosphor LMTO with A-site defects was successfully prepared. By increasing the randomness of the A-site and the distortion index of the [MnO6] octahedron, the luminescence performance of the phosphor was further enhanced.
DALTON TRANSACTIONS
(2022)