Article
Chemistry, Applied
Madan M. Upadhyay, Kaushal Kumar
Summary: Cubic phase Tm3+/Yb3+:Y2O3 and Tm3+/Yb3+/Gd3+:Y2O3 phosphors prepared by low temperature combustion technique exhibit upconversion emission in the UV-visible range. The phosphors show characteristic emission bands from Tm3+ ions and enable optical thermometry using specific Stark sublevels. The maximum absolute sensitivity of the tridoped phosphor at 298 K is 1.33 x 10(-3) K-1.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
Yang Sun, Yangbo Wang, Chengchao Hu, Xufeng Zhou, Jigong Hao, Wei Li, Huaiyong Li
Summary: Upconversion materials with unique optical properties have the potential for broad application prospects in light energy utilization. A series of Pr3+, Gd3+ doped Y7O6F9 phosphors were synthesized and their optical properties were studied.
Article
Chemistry, Physical
Priti Singh, Ram Sagar Yadav, Priyam Singh, Shyam Bahadur Rai
Summary: This study compares the upconversion and downshifting properties of different Ho3+-Yb3+ co-doped perovskite phosphors, demonstrating their potential for applications in display devices, solid state lighting, upconversion based devices, and temperature sensing. The phosphor samples exhibit intense green emission under 980 nm excitation, with varying intensities and sensitivities to temperature among different perovskite phosphors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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, Multidisciplinary
Hao Cai, Zhen Song, Quanlin Liu
Summary: A novel persistent ultraviolet-emitting phosphor LiLuGeO4:Bi3+,Yb3+ is demonstrated, which can be re-stimulated by near infrared light and has a decay time longer than 15 hours. It shows potential applications in biophotonic applications.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Linqing Shao, Yan Zhao, Xusheng Wang, Yanxia Li
Summary: In this study, an Er3+/Yb3+/Gd3+ co-doped YNbO4 upconversion luminescent material was synthesized and the composition and intrinsic luminescence mechanism were studied in detail. The results showed that the UCL intensity was enhanced by the addition of Gd3+. Using fluorescence intensity ratio technology, the temperature sensing performance of the material was obtained, indicating its great application potential in the field of temperature sensing.
BULLETIN OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Cong Han, Jin Tan, Ao Xiong, Tian Zhang
Summary: Researchers have developed a dual-emitting optical thermometer material using fluorescence intensity ratio technology, which can remotely and non-invasively measure temperature.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Zhimin Yu, Yang Yang, Jiaming Sun
Summary: Y-0.9(GdxBi1-x)(0.1)BO3 phosphors were synthesized at high temperature, and their differentiated phases and micro-morphologies were determined. Strong photon emissions were observed under both ultraviolet and visible radiation, confirming the effectiveness of energy transfer from Bi3+ to Gd3+ ions. The optimal emission was obtained from Y0.9Gd0.08Bi0.02BO3 phosphor annealed at 800 degrees C, with maximum quantum yields (QYs) of 24.75% and 1.33% under 273 nm and 532 nm excitations, respectively. These UVB luminescent phosphors based on co-doped YBO3 orthoborates have potential applications in skin treatment.
Article
Optics
Xin Wang, Xiang Ping Li, Yuhang Zhang, Baojiu Chen
Summary: Optical transitions and near-infrared upconversion luminescence properties of Er3+ single-doped and Er3+, Yb3+ co-doped YNbO4 phosphors were investigated. The absorption and emission cross-sections of Er3+ and Yb3+ ions in YNbO4: Er3+, Yb3+ samples were calculated using the Judd-Ofelt theory and modified Judd-Ofelt calculation method. The energy transfer from Er3+ to Yb3+ was quantitatively analyzed, and the near-infrared upconversion emission spectra of YNbO4: Er3+, Yb3+ samples were measured using 1550 nm excitation wavelength.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
Youru Bai, Xiaochen Yu, Boyang Gao, Yajing Wang, Hanbo Yang, Chaofei Wu, Ruru Wei, Kexuan Guo, Peng Zhao
Summary: In this study, a series of Ca0.5Gd(WO4)2: Ho3+/Yb3+/Bi3+ phosphors were prepared by the solid-state reaction method and characterized. Results showed that appropriate doping of Ho3+, Yb3+, and Bi3+ can enhance the upconversion luminescence intensity and optical temperature sensing performance of Ca0.5Gd (WO4)2.
JOURNAL OF LUMINESCENCE
(2024)
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
Materials Science, Multidisciplinary
Z. Liu, R. X. Wang
Summary: Yb3+/Pr3+ codoped Bi4Ti3O12 ceramic was fabricated by solid state sintering, and its luminescence properties make it a promising candidate for luminescence thermometry.
CHALCOGENIDE LETTERS
(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, Multidisciplinary
Venkata N. K. B. Adusumalli, Song Yeul Lee, Akash Gupta, Yong Il Park
Summary: In this study, luminescent nanocrystals (NCs) with the ability to emit multiple colors were engineered using the thermal decomposition method. The core-shell and core-shell-shell NCs exhibited blue and green emissions when sensitized by specific ions and under laser irradiation. By introducing an active inert layer as a shell, the upconversion luminescence efficiency of the NCs was improved. Furthermore, functionalization of the NC surface allowed for the development of stable fluorescent inks, which were used to print invisible patterns on paper that exhibited different colors under specific excitation sources. This demonstrates the potential of these dual-mode excitable multi-shell NCs for anticounterfeiting applications.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Physics, Condensed Matter
Yuhong Zhang, Yibin Guo, Xingke Zheng, Pengcheng Wang, Hang Liu
Summary: A series of AWO4 (A = Sr, Ca): Yb3+/Tm3+/Gd3+/Er3+ phosphors were successfully prepared via the solid-state method. The samples with Gd3+ ions exhibited significantly increased upconversion (UC) emission intensity compared to those without Gd3+ ions due to the shrinkage of host lattice. Furthermore, the CaWO4: Yb3+/Tm3+/Gd3+/Er3+ phosphor showed high temperature sensing characteristics, making it suitable for optical thermometry applications.
PHYSICA B-CONDENSED MATTER
(2023)