Article
Nanoscience & Nanotechnology
Wei Zheng, Baoyu Sun, Yuemei Li, Rui Wang
Summary: This study introduces a new strategy for nanothermometry, utilizing the synergistic effects of Er3+ and inverse fluorescence intensity ratio in Gd2O3:Er3+,Yb3+ nanospheres to significantly enhance absolute sensitivity. Controllable tuning of sensitivity was achieved by adjusting Yb3+ concentration, while also maintaining outstanding signal discriminability.
ACS APPLIED NANO MATERIALS
(2021)
Article
Materials Science, Ceramics
K. Naveen Kumar, L. Vijayalakshmi, Hyeongyu Bae, Kang Taek Lee, Pyung Hwang, Jungwook Choi
Summary: Yb3+/Er(3+) codoped La10W22O81 (LWO) nanophosphor rods were successfully synthesized via a hydrothermal assisted solid state reaction method, and their upconversion photoluminescence properties were systematically investigated. The appropriate doping of Er3+ ions significantly enhanced the upconversion emission, but concentration quenching occurred when the doping concentration exceeded a certain threshold. Co-doping with Yb3+ ions further intensified the green upconversion emission.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Hongqiang Cui, Yongze Cao, Lei Zhang, Ying Li, Yuhang Zhang, Lei Li, Jinsu Zhang, Baojiu Chen
Summary: A series of Er3+/Yb3+ co-doped Cs3GdGe3O9 (CGG) phosphors were prepared and their microstructure and upconversion luminescence properties were studied. Abnormal phenomena were observed, including continuously increasing upconversion luminescence intensity under 980 nm laser irradiation and thermal enhancement. The phenomenon is attributed to electron releasing of host defects. CGG:Er3+/Yb3+ phosphors exhibit temperature-dependent upconversion luminescence, with a significant increase in intensity at higher temperatures. The maximum absolute sensitivity and relative sensitivity of the samples were calculated, and it was found that CGG:Er3+/Yb3+ phosphors can be used as a high-temperature optical thermometer.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(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
Chemistry, Physical
Qingran Wang, Hao Wu, Liangliang Zhang, Huajun Wu, Yongshi Luo, Guohui Pan, Zhendong Hao, Quanquan Mu, Jiahua Zhang
Summary: Er3+ and Yb3+ codoped Gd2Mo4O15 upconversion phosphors were synthesized and studied for their luminescent properties and temperature sensing behaviors. The results indicate that Gd2Mo4O15 is a promising green upconversion phosphor for optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Kefan Wu, Enhui Wang, Jun Yuan, Jing Zuo, Ding Zhou, Haifeng Zhao, Yongshi Luo, Ligong Zhang, Bin Li, Jiahua Zhang, Langping Tu, Hong Zhang
Summary: Recently, high doping of lanthanide ions (up to 100%) in nanostructured upconversion phosphors has been achieved. However, this breakthrough did not lead to an enhancement of upconversion at ambient temperature. In this work, the role of phonon-assisted cross relaxation in this phenomenon is confirmed using an Er3+-rich upconversion nanosystem. Lowering the temperature can exponentially enhance the upconversion luminescence by over two orders of magnitude. This understanding will contribute to improving upconversion performance and the application of highly doped rare earth materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Talita J. S. Ramos, Ricardo L. Longo, Carlos D. S. Brites, Rute A. S. Ferreira, Oscar L. Malta, Luis D. Carlos
Summary: Low-power near-infrared lasers can drive upconversion broadband white light emission. Despite the sensitizer and activator being in different particles, efficient continuous upconversion emissions were observed. The synthesized nanoparticles also functioned as luminescent thermometers with potential applications in remote temperature sensing.
Article
Chemistry, Physical
Hongqiang Cui, Yongze Cao, Yuhang Zhang, Lei Li, Guojian Li, Sai Xu, Yichao Wang, Jinsu Zhang, Baojiu Chen
Summary: LiYGeO4:Er3+/Yb3+ phosphors were synthesized and their up-conversion luminescence thermal enhancement and emission color modulation were investigated. The phosphors showed potential applications as high-temperature optical thermometers and anti-counterfeiting materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Junhao Xing, Fei Shang, Guohua Chen
Summary: A novel Yb3+/Er3+ double doped glass ceramic material containing NaSrPO4 nanocrystals was synthesized and systematically studied for its up-conversion optical properties and temperature-sensitive performance. The material exhibited potential as optical temperature sensors based on its maximum relative sensitivity at 298 K and maximum absolute sensitivity at 573 K.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Shouquan Wei, Xiaoying Shang, Ping Huang, Wei Zheng, En Ma, Jin Xu, Meiran Zhang, Datao Tu, Xueyuan Chen
Summary: This study reveals the linearly polarized upconversion luminescence (UCL) characteristics in LiLuF4:Yb3+/Er3+ single microcrystals, providing insights for the future design of anisotropic luminescent probes.
SCIENCE CHINA-MATERIALS
(2022)
Article
Optics
Angela Enachi, Octavian Toma, Serban Georgescu
Summary: The study investigated luminescent centers in Er:Yb:CaSc2O4 and observed two distinct centers, with one dominating at low temperatures, while the population of the other center increased with doping concentrations. This study also explored the Stark energy levels for both centers and discussed the temperature dependence of upconversion intensity.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Jingjing Tang, Yujian Wu, Minkun Jin, YueXin Li, Changheng Chen, Jinmeng Xiang, Chongfeng Guo
Summary: In this study, a noncontact upconversion optical temperature sensor was developed and a flexible thin-film thermometer was fabricated for detecting the temperature of microelectronic components. The results showed stable emission and sensitivity of the sensor, indicating its potential to replace traditional thermometers.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Minarul I. Sarkar, K. V. Cinumon, Kaushal Kumar
Summary: Er3+/Yb3+ doped Gd2O3 phosphor samples were synthesized using a combustion method and characterized using X-ray diffraction and FE-SEM techniques. The samples were studied for photoacoustic spectroscopy and upconversion emission spectroscopy, and a correlation between non-radiative transitions and radiative transitions was established to optimize the sample properties. Codoping the phosphor with Mg2+ and Zn2+ ions enhanced the upconversion emission intensity. The present sample demonstrated potential for upconversion imaging, photothermal therapy, and fingerprint detection.
Article
Biochemical Research Methods
Muktesh Mohan, Raju Poddar
Summary: The study synthesized a multimodal imaging probe with both upconversion and paramagnetic properties for optical coherence tomography systems, demonstrating its potential for targeted imaging applications.
JOURNAL OF FLUORESCENCE
(2021)
Article
Chemistry, Physical
Kamel Saidi, Mohamed Dammak, K. Soler-Carracedo, Inocencio R. Martin
Summary: In this study, Yb3+-Er3+ and Yb3+-Ho3+ co-doped Na3Gd(VO4)2 (NGVO) microparticles were synthesized using a citrate-based sol-gel method, allowing for temperature sensing in the visible region with high sensitivity. The NGVO:Yb3+/Ho3+ phosphors showed excellent thermal resolution in high-temperature environments, suggesting potential applications as safety signs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Arvind Kumar, Praveen Kumar Shahi, Amresh Bahadur, Sunil Kumar Singh, Rajiv Prakash, Ram Anjore Yadav, Shyam Bahadur Rai
MATERIALS RESEARCH EXPRESS
(2020)
Article
Physics, Multidisciplinary
M. K. Srivastava, Upendra Kumar
Summary: This study synthesized hematite nanoparticles through repeated calcination of Fe(NO3)(3).9H(2)O and HMTA precursor, followed by thermal treatment. The crystalline structure and optical properties of the nanoparticles were studied, showing the transformation of cubic Fe3O4 to rhombohedral alpha-Fe2O3 with increased crystallinity up to 500 degrees C, followed by slight amorphization at 600 degrees C. The optical band gap was determined to be 1.87 eV for most crystalline alpha-Fe2O3.
Article
Materials Science, Multidisciplinary
Arvind Kumar, Manish Kumar, Prakash Chandra Sati, Manish Kumar Srivastava, Surajit Ghosh, Shiv Kumar
Summary: The study investigates the synthesis of Ni-doped CuO nanoparticles using sol-gel method, with XRD and Raman spectroscopy confirming the crystalline structure and vibrational properties. The results indicate a decrease in band gap and weak ferromagnetism with increasing dopant concentration in the CuO matrix. The weak induced magnetization is attributed to inter-grain magnetic interactions in the nanoparticles induced by the exchange interaction between Ni ions and carriers in the lattice.
CURRENT APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Chhavi Mitharwal, Geetanjali, Shilpa Malhotra, Anshika Bagla, Manish Kumar Srivastava, Surya Mohan Gupta, Chandra Mohan Singh Negi, Epsita Kar, Ajit R. Kulkarni, Supratim Mitra
Summary: The dopamine-modified filler incorporated PVDF composite shows potential for flexible energy storage and harvesting applications. The composite exhibits improved filler dispersion and dielectric properties, leading to enhanced energy harvesting and storage capabilities. Different filler contents result in varying energy storage density and energy harvesting performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Materials Science, Multidisciplinary
Santosh Kachhap, Sachin Singh, Akhilesh Kumar Singh, Sunil Kumar Singh
Summary: Inorganic halide perovskites (IHPs) have attracted intense research efforts due to their stability, optoelectronic properties, cost-effectiveness, and applications. Lanthanide doping in IHPs has opened up new possibilities for emerging applications, and has significantly improved their stability, structure, and optical properties. However, there is a lack of comprehensive reviews on this development for IHPs. This review aims to provide important fundamental aspects and recent developments, focusing on CsPbX3 materials and their lanthanide doping, while also covering the doping of non-lanthanide metal ions in IHPs for comparison. Novel applications and future perspectives are discussed as well.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Analytical
Sachin Singh, Santosh Kachhap, Akhilesh Kumar Singh, Sasank Pattnaik, Sunil Kumar Singh
Summary: Optical temperature sensing using upconversion emission in lanthanide-doped phosphors has been achieved. Various parameters, such as particle shape and size, symmetry type at the site position, and distribution of lanthanide ions, affect the upconversion intensity of the phosphor. However, there is limited research comparing the temperature sensing ability of bulk and nanostructure phosphors. In this study, Ca0.79Er0.01Yb0.2MoO4 phosphors were synthesized in bulk (SCEY) and nanostructures (CCEY) to investigate their properties. The results show that the temperature sensing ability of nanoparticle-based phosphor is better than its bulk counterpart.
METHODS AND APPLICATIONS IN FLUORESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Charu Dubey, Shruti, Sunil Kumar Singh, Akhilesh Kumar Singh
Summary: In this work, a bi-luminescent security ink has been developed that offers multilevel anti-counterfeiting strategies and exhibits good stability in different environments.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Materials Science, Multidisciplinary
Manisha Sharma, Priyam Singh, Sunil Kumar Singh, Prabhakar Singh
Summary: This study investigates the dual-mode emission behavior of lanthanide co-doped self-activated Ca9Y1_x_yErxYby(VO4)7 phosphors for the first time. By introducing Li+ ions, the upconversion emission is enhanced, and the optimized phosphor is explored for optical temperature sensing using the fluorescence intensity ratio (FIR) technique.
Review
Chemistry, Inorganic & Nuclear
Priyam Singh, Santosh Kachhap, Prabhakar Singh, S. K. Singh
Summary: Lanthanide-based hybrid materials have a wide range of applications in fields such as bio-imaging, sensors, and optical switches, and significant progress has been made in the past decade. This review covers the components, design, synthesis techniques, optical properties, and applications of these materials, as well as the remaining challenges and future opportunities in this research field.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Optics
Himani Thakur, Arvind K. Gathania, Santosh Kachhap, Sunil Kumar Singh, Rajesh Kumar Singh
Summary: The present work reports the coprecipitation synthesis and characterization of upconverting YPO4: Tm3+, Yb3+ phosphor. The structure and morphology of the synthesized phosphor were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Scanning electron microscopy (SEM). The upconversion luminescence properties of the prepared phosphor were studied under near-infrared (NIR) 980 nm laser excitation. The optimized concentration of Tm3+ (0.3 mol%)/Yb3+(10 mol%) showed intense and sharp emission in the NIR (-796 nm) region.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Santosh Kachhap, Neeraj Kumar Giri, Shruti, Rajiv Prakash, S. K. Singh
Summary: GdScO3 perovskite exhibits high thermal stability, high bandgap, and low phonon energy, making it ideal for optical applications such as infrared-to-visible photon upconversion emission. In this study, pristine and Yb3+, Er3+ co-doped GdScO3 nanocrystals were successfully synthesized at low temperatures, and their crystal structure, phase, and optical properties were analyzed. It was found that GdScO3 nanocrystals exhibit photon upconversion properties and can be used for non-contact luminescence-based temperature sensing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Charu Dubey, Anjana Yadav, Diksha Baloni, Sachin Singh, Anjani Kumar Singh, Sunil Kumar Singh, Akhilesh Kumar Singh
Summary: A multi-stimuli-responsive luminescent security ink containing various luminescent materials was developed, which can emit green, red, and green light under different excitations. This ink has excellent dynamic anticounterfeiting properties and shows a change in emission color with time delay.
METHODS AND APPLICATIONS IN FLUORESCENCE
(2023)
Article
Materials Science, Ceramics
Himani Thakur, Sachin Singh, Arvind K. Gathania, Sunil Kumar Singh, Rajesh Kumar Singh
Summary: The Pechini sol-gel reaction technique was used to produce Tm3+, Yb3+ co-doped YVO4 and Li+/K+/Zn2+ codoped YVO4: Tm3+,Yb3+ phosphors. Post-heat treatment was conducted to strengthen the structural and optical characteristics of the samples. The prepared phosphors exhibited blue and near-infrared (NIR) light and showed strong upconversion emission when pumped with a laser at 980 nm.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Sachin Singh, Santosh Kachhap, Manisha Sharma, Sunil Kumar Singh
Summary: We demonstrate an enhancement in the upconversion (UC) emission and temperature sensing property of a CaMoO4:Er/Yb phosphor via distortion of the local symmetry environments and reduction in no-radiative channels. The introduction of Bi3+ co-doping creates asymmetry around the Er3+ ions and reduces dislocation density and micro-strain, leading to a significant improvement in UC emission and temperature sensitivity. The results indicate the potential of the material for temperature sensing applications and provide new avenues for the development of high-performance temperature sensing materials.
Proceedings Paper
Materials Science, Multidisciplinary
Swati Jharwal, Pawan Kumar Singh, Devendra Kumar Rana, Manish Kumar Srivastava, Arvind Kumar
Summary: In this study, Cu, Mn co-doped NiO particles were synthesized using the sol-gel method and characterized for their structural and magnetic properties. XRD, FTIR, and Raman techniques were used for structural investigations, revealing the formation of pure phase NiO nanoparticles with a crystallite size ranging from 10 to 15 nm. The magnetization curve showed ferromagnetic behavior at room temperature for the synthesized NiO and Cu, Mn co-doped NiO nanoparticles, with a decrease in maximum magnetization for the doped NiO nanoparticles.
MATERIALS TODAY-PROCEEDINGS
(2022)
