Article
Materials Science, Ceramics
Lixin Zhang, Qingyu Meng, Wenjun Sun, Shuchen Lue
Summary: In this study, Sm3+/Tb3+-co-doped NaGd(MoO4)(2) phosphors were prepared and their temperature-dependent emission spectra were analyzed to show that the fluorescence intensity ratio can be used to represent temperature. The temperature-sensing sensitivity of the phosphors gradually increased with the increasing sodium citrate and rare earth molar ratio. The Commission International del'Eclairage chromaticity coordinates displayed continuous color changes of the specimens from green to red with temperature.
CERAMICS INTERNATIONAL
(2021)
Article
Optics
Lili Tang, Qingyu Meng, Wenjun Sun, Shuchen Lu
Summary: NaY(MoO4)(2): Pr3+, Tb3+ phosphors were prepared by hydrothermal method with the addition of sodium citric as chelator. Experimental results showed that the morphology of the samples was influenced by the addition of sodium citrate, and the sensitivity of the phosphors changed with the increase of the molar ratio of Cit(3-)/Re3+. Also, the luminous color of the phosphors changed continuously with the change of temperature.
JOURNAL OF LUMINESCENCE
(2021)
Review
Chemistry, Physical
Qiang Wang, Min Liao, Qiuming Lin, Mingxiang Xiong, Zhongfei Mu, Fugen Wu
Summary: This review examines the current research status of all inorganic thermometers based on fluorescence intensity ratio (FIR) technology, categorizing and analyzing the thermometers in detail, discussing performance parameters, and looking forward to the future development.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Qiang Wang, Shuang Zhao, Jun Wen, Xiaoxiao Huang, Chenlong Wei, Qiangsheng Xia, Zhongfei Mu, Hai Guo
Summary: Optical temperature sensing based on fluorescence intensity ratio (FIR) technology is a potential method for temperature measurement due to its fast response, non-invasive nature, and high accuracy. A multi-strategy combination method was used to study the multi-mode temperature sensing performance of optical temperature sensing materials, leading to the development of high-performance materials and the establishment of temperature sensing models. This approach opens up an effective pathway for the rapid development of inorganic optical temperature sensing materials.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yuange Liu, Qingyu Meng, Lin Bai
Summary: In this experiment, Gd2Ti2O7: x% Sm3+, 1% Tm3+ (x = 0.1, 0.3, 0.5, 1) optical temperature sensing materials were synthesized using the hydrothermal method with urea as the precipitant. XRD analysis confirmed the face-centered cubic phase pyrochlore structure of the prepared samples, while FE-SEM images revealed their irregularly spherical morphology. The temperature-dependent emission spectrum measurements indicated that Tm3+ exhibited significant thermal quenching, while Sm3+ showed a slower thermal quenching trend, leading to significant variations in their fluorescence intensity ratios (FIRs) with temperature. By comparing different samples, it was found that increasing Sm3+ concentration resulted in higher absolute sensitivity but decreasing relative sensitivity. The maximum absolute sensitivity was 0.0686 K-1 (483 K, 1% Sm3+, 1% Tm3+), and the maximum relative sensitivity was 3.1% K-1 (297.7 K, 0.1% Sm3+, 1% Tm3+). Additionally, the luminescence color of the Gd2Ti2O7: 0.1% Sm3+, 1% Tm3+ phosphors continuously changed from blue to orange-red with increasing temperature, allowing for rough estimation of temperature changes based on luminescence color. The temperature cycle test demonstrated good repeatability of temperature measurement using FIR. Overall, Gd2Ti2O7: Sm3+, Tm3+ phosphors showed promising application prospects.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Zhiyuan Zhang, Qingyu Meng, Lin Bai, Wenjun Sun
Summary: Y2Ti2O7: x% Pr3+, 5% Tb3+ phosphors were synthesized by hydrothermal method, and it was found that they exhibit different luminescent characteristics at different temperatures, making them suitable for temperature sensing applications. Among them, Y2Ti2O7: 1% Pr3+, 5% Tb3+ sample showed higher relative sensitivity and better stability within the range of human body temperature. Additionally, this sample also demonstrated excellent repeatability in FIR temperature measurements.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Heming Ji, Xunze Tang, Haiyan Zhang, Xiaolong Li, Yannan Qian
Summary: YbNbO4:Er3+ phosphors were synthesized through the hydrothermal method with LiOH·H2O as flux in the H2O/EG system. The phosphors exhibited agglomerated irregular polygons and some tiny grains, with XRD and Raman spectra used to understand the phase structure and crystal growth mechanism. The study revealed promising sensor sensitivity of YbNbO4:Er3+ at 220 K under 980 nm excitation, making it suitable for optical low-temperature sensors.
Article
Chemistry, Physical
Zhenhua Li, Qi Han, Tianpeng Yan, Zhanjun Huang, Yinglin Song, Yuxiao Wang, Xueru Zhang
Summary: In this work, Er3+, Yb(3+)co-doped Gd2O3 phosphors were synthesized through a simple hydrothermal method, and the optimal doping concentration was investigated. The study revealed the influence of calcination temperature on the formation of self-assembled structures and the regulation of fluorescence intensity by adjusting the ratio of NH4F and lanthanoid nitrate. Additionally, the fluorescence intensity ratio based on thermally coupled energy levels and the sensitivity of optical temperature sensing were explored.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Zhiyu Zhang, Jingjing Tang, Minkun Jin, Yuexin Li, Wang Chen, Changheng Chen, Jinmeng Xiang, Chongfeng Guo
Summary: Non-invasive photo-thermal therapy (PTT) with accurate temperature monitoring is important for effective cancer treatment. This study developed dual-function photothermal agents YVO4: Nd3+, Yb3+@IR-780 with real-time temperature control and excellent photothermal conversion. The temperature detection behavior based on fluorescence intensity ratio (FIR) and fluorescence lifetime thermometry were investigated. Results showed the potential application of these photothermal agents in photothermal therapy.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Yuhong Zhang, Hui Jia, Xin He, Yuhao Zheng, Renxiang Bai, Hang Liu
Summary: In this study, Gd2O3: Yb3+/Er3+/Bi3+ phosphors were prepared using the sol-gel method, with the addition of Bi3+ ions found to enhance the upconversion (UC) emission intensity. The temperature sensitivity of the Gd2O3: Yb3+/Er3+/Bi3+ phosphors reached 0.0075 K-1 at 548 K, making them a potential candidate for temperature sensing applications.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Xiao Wu, Lulu Lou, Haicheng Feng, Guolin Lv, Qiang Wang, Daoyun Zhu, Chuanxin Jiang, Zhongfei Mu
Summary: Fluorescence intensity ratio-based temperature sensing technology, with advantages such as non-contact, fast response, and high precision, has become a focus in the field of temperature measurement. A newly prepared Bi3+ and Eu3+ co-doped luminescence material showed promising temperature sensing performance, adding a new candidate to the family of temperature sensing materials. The LaB3O6: Bi3+, Eu3+ sample exhibited absolute and relative sensitivities of 0.008 K-1 and 0.579 % K-1 at 423 K, respectively.
Article
Chemistry, Physical
Weidi Xia, Li Li, Yongbin Hua, Faling Ling, Yongjie Wang, Zhongmin Cao, Sha Jiang, Guotao Xiang, Xianju Zhou, Jae Su Yu
Summary: This study synthesized Sr2InSbO6 phosphors with good temperature sensing performances and found that the optimal doping concentration was 3%, resulting in significant temperature sensitivities.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Crystallography
Qingliang Xu, Wanqing Qian, Raz Muhammad, Xinhua Chen, Xueqing Yu, Kaixin Song
Summary: The study fabricated various double perovskite-structured La2MgSnO6: Bi3+, Sm3+ (LMS: Bi3+, Sm3+) phosphors using the high-temperature solid-phase approach. The Rietveld refinement and Gaussian fitting analysis confirmed the presence of Bi3+ occupying three lattice sites. Energy transfer from Bi3+ to Sm3+ was observed with a transfer efficiency of up to 59.07%. The LMS: 0.02Bi(3+), 0.05Sm(3+) phosphor exhibited good optical temperature sensitivity, with a maximum absolute sensitivity Sa-max of 0.0055 K-1 and a maximum relative sensitivity Sr-max of 0.88% K-1, showing potential applications in optical temperature sensors.
Article
Chemistry, Physical
Zhe Liu, Yuhang Zhang, Baojiu Chen, Xin Zhao, Edwin Yue Bun Pun, Hai Lin
Summary: The Er3+/Yb3+-doped NaGdF4 crystal-implanted fiber (CIF) synthesized by the electrospinning technique shows high sensitivity and accuracy in temperature sensing, with self-calibration functionality achieved through the combination of main and auxiliary sensing. It has great potential for applications in diverse and harsh environments, offering precise temperature measurement.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Xing Zhang, Haihong Zheng, Jiaxuan Hu, Fumin Lu, Xiusha Peng, Rongfei Wei, Fangfang Hu, Hai Guo
Summary: By designing energy transfer and modifying the local lattice environment, the efficiency of up-conversion luminescence of Tm3+ has been significantly enhanced. Additionally, the B2.2S0.8LO:Tm3+/Yb3+ sample shows superior temperature sensing properties with high sensitivity, wide sensing range, and stability.
CERAMICS INTERNATIONAL
(2021)
Article
Optics
Irina V. Berezovskaya, Shihang Zhou, Bibo Lou, Min Yin, Chong-Geng Ma, Anatoliy S. Voloshinovskii, Vladimir P. Dotsenko
Summary: The luminescence properties of Ce3+ ions in Ca2BO3Cl were studied through experiments and theoretical calculations. Different centers involving Ce3+ were formed in Ca2BO3Cl due to the presence of different charge compensating defects. Experimental results and first-principles calculations showed that the introduction of Na+ hardly influenced the luminescence properties of Ce3+-doped Ca2BO3Cl.
JOURNAL OF LUMINESCENCE
(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
Chemistry, Physical
Longbing Shang, Mingzhe Liu, Chang-Kui Duan
Summary: By choosing hosts with appropriate sites, the Cr3+ activators can produce desired near-infrared broadband emission via ligand field engineering. First-principles calculations help to analyze the site, valence, and luminescent mechanism of the activators. It is found that the experimentally reported near-infrared emission is actually produced by Cr3+ at the octahedral site.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
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
Anjun Huang, Mingzhe Liu, Chang-Kui Duan, Ka-Leung Wong, Peter A. Tanner
Summary: Lead-free double perovskite halides, particularly bismuth chlorides, have shown great potential in solar cells and solid-state lighting applications. This study combines theory and experiments to understand the optical behavior of Cs2NaBiCl6 and highlights its defects and excitation properties. The outstanding luminescence properties of this material make it suitable for anti-counterfeiting applications.
INORGANIC CHEMISTRY FRONTIERS
(2022)
