Article
Materials Science, Multidisciplinary
Bindiya Goswami, Rachna Ahlawat, Suman Devi
Summary: This research focuses on the synthesis of undoped and Sm3+-doped ZnAl2O4 using the citrate sol-gel method. Various techniques were used to investigate the effects of samarium ion (Sm3+) doping on crystallinity and emission mechanism. The results show that doped ZnAl2O4 exhibits good luminescent properties in the visible range and can be used as an efficient phosphor.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Optics
Yuqing Pei, Songsong An, Chen Zhuang, Da Sun, Xiaowei Li, Jia Zhang
Summary: A series of LS:1%Ho3+,xYb(3+) phosphors with different Yb3+ concentrations were synthesized and characterized. The samples exhibited strong red emission and weak green emission under excitation of 980 nm. The intensity of the UC emissions varied with the increase of Yb3+ concentration. The temperature sensing properties of LS:Ho3+,Yb3+ were characterized using the fluorescence intensity ratio technique.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Jia Zhang, Hualing Yu, Zhenghe Hua, Songsong An, Zhangyin Zhai
Summary: In this paper, Yb3+-Ho3+ co-doped La1.55SiO4.33 (LSO) phosphors were synthesized and their phase purity and morphology were studied. The upconversion (UC) luminescence of LSO:Yb3+,Ho3+ phosphors under 980 nm excitation was observed. The UC mechanism was explained by analyzing decay lifetimes and energy transfer processes between Yb3+ and Ho3+ ions. Additionally, the temperature-sensing behaviors of LSO:Yb3+,Ho3+ phosphors were analyzed using the fluorescence intensity ratio (FIR) method, and the sensor sensitivity was evaluated.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Jia Zhang, Na Li, Tianli Wang, Junxiao Wu, Shuaishuai Yu, Jie Fan, Shiyu Zhang, Meiguang Zhang, Lei Zhao, Wenbo Chen, Jing Bai
Summary: Long persistent luminescence (LPL) materials can release stored energy through thermal disturbance induced by temperature, with limitations at higher temperatures. Blue-emitting LPL phosphors were prepared and optimal room-temperature LPL time was found to be 80s, with the best performance observed at 453K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Wenjuan Dai, Fengfeng Chi, Bibo Lou, Xiantao Wei, Jie Cheng, Shengli Liu, Min Yin
Summary: The temperature-dependent luminescent characteristic of Cr3+ doped ZnGa2O4 phosphor was investigated, showing red-shift effects on the R1 and R2 lines as the temperature increased. The analyses of X-ray diffraction and X-ray photoelectron spectroscopy confirmed the synthesis of the ZGO:Cr3+ sample. The results demonstrate potential applications of Cr3+ doped phosphors in LED lighting and temperature sensing.
Article
Chemistry, Physical
Binghui Huang, Bo Zhang, Xiaobo Qian, Jingya Wang, Qiuhong Yang, Liangbi Su
Summary: In this study, Er3+ doped Bi4Ge3O12(BGO) crystals were investigated for their temperature sensing performance, showing that the sensitivity first increased and then decreased with the increase of Er3+ ion concentration, with the maximum sensitivity achieved in the 0.3 mol% Er3+ doped sample. The calculation using the Judd-Ofelt (J-O) theory revealed a larger ratio of green radiation transition rate at the thermal coupling level in the 0.3 mol% Er3+ doped Bi4Ge3O12 sample, suggesting it as a good candidate material for optical temperature sensing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Yu Zhang, Rui Qi, Lei Cao, Hongyang Wang, Lu Zhang, Shuai Lan, Fei Peng, Chun Liu, Dandan Jia, Dongjun Wang
Summary: Through the use of non-aromatic amines, distinct fluorescent peaks were discovered in non-traditional intrinsic luminescence (NTIL) systems, suggesting their origin from concentration-dependent aggregates. A strategy was proposed to prepare fluorescent systems with tunable emission and controllable excitation-dependent or excitation-independent fluorescence.
JOURNAL OF LUMINESCENCE
(2021)
Article
Materials Science, Ceramics
Jiuzhi Cui, Xin-Yuan Sun, Yufeng Wen, Chenxi Zhang, Runchuan Chen, Miaochun Wu, Meidong Yu, Chaoyuan Li, Zhuohao Xiao, Jing Wang
Summary: In this study, the emission peak of europium (Eu) ions in borosilicate glasses is tuned by adjusting the SiO2 to B2O3 ratio and the concentration of Eu ion dopants. It is observed that the emission peak can be redshifted by increasing the content of SiO2 or by introducing Eu2O3. Cyan emission is achieved by altering the [SiO4] tetrahedra, [BO4] tetrahedra, and [BO3] triangles within the glass. The results highlight the relationship between glass network structure, Eu ion concentration, and visible light emission.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Optics
Xin Wang, Xiangping Li, Sai Xu, Hongquan Yu, Jinsu Zhang, Xizhen Zhang, Yongze Cao, Lihong Cheng, Jiashi Sun, Baojiu Chen
Summary: Dy3+, Tm3+ single-/co-doped YNbO4 phosphors were prepared using a high temperature solid-state reaction method, resulting in monoclinic YNbO4 phosphors. The study investigated the temperature-dependent emission spectra of Dy3+ and Tm3+, and proposed a new model to describe the temperature dependence of fluorescence intensity ratio in the co-doped sample. The sensitivity of Dy3+ single-doped YNbO4 sample was found to be similar to that of the Dy3+, Tm3+ co-doped sample, and the chromatic stability was evaluated based on color coordinates.
Article
Chemistry, Physical
Dan Zhao, Ya-Li Xue, Yun-Chang Fan, Rui-Juan Zhang, Shi-Rui Zhang
Summary: The study successfully prepared millimeter-level single crystals of borate-phosphates and discovered their unique structural features and potential applications. The upconversion phosphor synthesized using this compound showed high sensitivity in optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Tongwei Wang, Shilong Zhao, Ruoshan Lei, Lihui Huang, Shiqing Xu
Summary: Eu3+ doped and Er3+/Yb3+ codoped glass ceramics with NaLa(WO4)2 nanoparticles were prepared and their optical and temperature sensing properties were investigated. Eu3+ ions showed enhanced photoluminescence intensity due to selective entering into the precipitated NaLa(WO4)2 nanoparticles, while Er3+/Yb3+ ions showed improved visible upconversion emissions and near-infrared photoluminescence due to enrichment in low phonon-energy NaLa(WO4)2 nanoparticles. The temperature sensitivity of 0.014K-1 at 476K demonstrates the potential of Er3+/Yb3+ codoped NaLa(WO4)2:glass ceramics for optical temperature-sensing applications.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Guilherme Almeida, Lara van der Poll, Wiel H. Evers, Emma Szoboszlai, Sander J. W. Vonk, Freddy T. Rabouw, Arjan J. Houtepen
Summary: This study reports on the size-dependent optical properties and biexciton lifetimes of core-only InP colloidal quantum dots. The novel synthesis method allows for the production of a range of monodisperse InP quantum dots with narrow absorption and emission linewidths and high quantum yields.
Article
Chemistry, Physical
Debao Zhang, Ji Zhou, Xuguang Cao, Xiaotian Ge, Fei Tang, Changcheng Zheng, Jiqiang Ning, Shijie Xu
Summary: In this paper, the giant tunability of thermal behaviors for the vibronic luminescence of Mn4+ ions in fluoride phosphors is demonstrated. The peculiar behavior is associated with the thermal excitation of low-frequency phonon bath, and a theoretical model is constructed to explain the phenomenon. The governing parameters for the distinct thermal behaviors of Mn4+-ion luminescence, including the thermal activation energy and the average phonon energy, are determined.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Energy & Fuels
Tayanne Ligeiro, Leticia Bizarre, Ivanei F. Pinheiro, Antonio C. Bannwart, Charlie van der Geest, Vanessa C. B. Guersoni
Summary: Understanding the rheological and thermal properties of wax oils is crucial in the O&G industry. The compositional effects on the behavior of wax deposits must be considered to improve prediction and mitigation techniques. The addition of micro wax can reduce the pressure required for oil field flow restart by weakening the three-dimensional network of macro wax crystals.
Article
Materials Science, Multidisciplinary
Yunhao Liang, Dongmei Wang, Heyan Wu, Shanshan Hu, Jun Yang
Summary: In this study, a series of KLu(MoO4)2 phosphors were synthesized by the citric acid assisted hydrothermal method and subsequent calcination. By doping different ions, such as Yb3+/Er3+, Yb3+/Ho3+, and Yb3+/Tm3+, green, red, and blue emissions were achieved, respectively. The effect of Yb3+/Er3+ doping on the fluorescence intensity was also investigated. The temperature sensing property and stability of KLu(MoO4)2: Yb3+/Er3+ phosphor were studied, showing potential application prospects in temperature sensor and multicolor fluorescence fields.
Article
Optics
R. B. Adamov, G. A. Melentev, I. V. Sedova, S. V. Sorokin, G. V. Klimko, I. S. Makhov, D. A. Firsov, V. A. Shalygin
Summary: This study investigates the THz luminescence in doped nanostructures with GaAs/AlGaAs quantum wells under interband optical pumping. The results show that the spatial separation of donors and acceptors can greatly enhance the integrated intensity of THz emission.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yanru Li, Lei Zhong, Sha Jiang, Yutong Wang, Binyao Huang, Guotao Xiang, Li Li, Yongjie Wang, Chuan Jing, Xianju Zhou
Summary: In this study, a ratiometric luminescent thermometry based on dual-emission centers was developed using co-doped CaNb2O6 phosphors with Bi3+ and Pr3+. The obtained samples exhibited good thermosensitive and thermochromic characteristics, with a maximum absolute sensitivity of 0.09 K-1 @ 528 K and a maximum relative sensitivity of 2.17 % K-1 @ 453 K.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yujing Gong, Yeqing Wang, Zhiyuan Wang, Yijian Sun, Yi Yu
Summary: Single crystals of Dy3+ single-doped and Dy3+/Tb3+ co-doped CaYAlO4 were grown and analyzed. The incorporation of Tb3+ resulted in increased absorption and emission cross sections. The fluorescence lifetimes and branching ratios of the yellow emission were affected by the presence of Tb3+. The deactivation effect of Tb3+ ions and energy transfer mechanism were also discussed.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Lu Chen, Zhuangzhuang Ma, Jian Chen, Wang Guo
Summary: This study focuses on enhancing the thermal robustness of phosphor converter materials by preparing composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO. The composite ceramics showed high density and thermal conductivity at the optimum temperature of 1400℃. Stable laser-driven white light was obtained under blue laser excitation.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yuwei Wu, Chunhui Niu, Lei Wang, Mingqing Yang, Shiyu Zhang
Summary: Er3+-doped germanate-tellurite glasses were prepared and their structure, luminescent, and temperature-sensing properties were studied. The glass exhibited large values of O2 and O6 and its luminescence intensity varied with temperature.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Kensei Ichiba, Takumi Kato, Kenichi Watanabe, Yuma Takebuchi, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Eu-doped YVO4 single crystals with different concentrations were fabricated to evaluate their photoluminescence and scintillation properties. The results showed that the samples doped with Eu exhibited emission peaks due to 4f-4f transitions in PL and scintillation spectra. Based on the pulse height spectra, the light yield of the Eu-doped samples increased with increasing Eu concentration, while the afterglow level decreased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Daiwen Xiao, Hei-Yui Kai, Anjun Huang, Menglin Song, Ka-Leung Wong, Peter A. Tanner
Summary: The emission spectra of Cs2NaEuCl6 nanoparticles synthesized by the hot injection method are explained. The dispersion of the nanoparticles in alkane solvents in the experiment allows the determination of the magnetic dipole radiative rate for the D-5(0) -F-7(1) channel in vacuum, which is in agreement with the calculated value.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Italia V. Barbosa, Geraldine Dantelle, Alain Ibanez, Lauro J. Q. Maia
Summary: The thermal response and luminescence properties of different oxide matrices were evaluated to design more accurate thermal probes. It was found that thermal probes emitting in BW-II provide better thermal sensing with higher signal-to-noise ratio. Additionally, doping Nd3+ in Y2O3 matrix maximizes luminescence intensity, making it a promising matrix for thermal sensing.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xin Li, Yu Zhang, Hongrui Ren, Lunlong Xie, Yinsheng Di, Mengqing Han, Zhaohui Bai, Quansheng Liu, Liangliang Zhang, Jiahua Zhang
Summary: This study successfully prepared phosphor samples based on Ca3-xLuxSc2-xMgxSi3O12:Ce3+ and investigated their luminescence properties. With the increase in Lu-Mg concentration, the peak of the sample redshifted, but the thermal stability gradually decreased. The LD devices made from CLSMS:Ce3+ fluorescent materials showed a decrease in cyan-green light and an increase in red light as the Lu-Mg concentration increased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Tim Pier, Julia Hopster, Thomas Juestel
Summary: This study investigates and reports on several samples of cerium-activated gallium-based garnet phosphors. The optimal activator concentration was found to be 1 atom-%. The size of non-emitting lanthanide ions and the molar concentration of cerium strongly influenced the crystal field splitting, which in turn shaped the excitation and emission wavelengths.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Guijie Zhao, Wei Shi, Xin Xin, Fengcai Ma, Yongqing Li
Summary: This study reveals for the first time the proton transfer pathways and changes in the photophysical properties of P-TNS with three intramolecular hydrogen bonds. The reaction mechanism and driving force for the proton transfer process are explained through analysis of potential energy surface, frontier molecular orbitals, and hydrogen bond parameters, among others.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Li He, Jinshu Huang, Zhengce An, Haozhang Huang, Yu Zhao, Kexin Zhong, Bo Zhou
Summary: In this study, we designed a NaYF4:Yb3+/Tm3+@NaYF4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity. We found that the blue upconversion emission of Tm3+ decreased while the deep-red emission increased with elevating temperature. The sample also showed a gradual emission color change from blue to purplish-red, and the optimal relative sensitivity reached 2.79% K-1.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Rupesh A. Talewar
Summary: A series of Li2TiO3 phosphors doped with Mn4+ and codoped with Mn4+ and Er3+ were synthesized, which demonstrated the ability of Mn4+ ions to absorb UV-Vis photons and subsequently transfer energy to Er3+ ions, resulting in the emission of near-infrared light. These materials have the potential to enhance the absorption efficiency of Er3+-based luminescent materials.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xingyuan Ma, Jianfeng Li
Summary: Carbon quantum dots (CQDs) with tunable photoluminescence properties have been synthesized using suitable carbon and dopant sources in an aqueous system. The synthesized CQDs exhibited blue, green, yellow, and red emissions, and solid-state luminescence was achieved through the preparation of solid-state fluorescent films and phosphors. This study provides important technical support for the future development of CQDs synthesis.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
De Bin Fu, Yang Bing Xu, Yu Teng Zhang, Shan Ting Liu, Xiao Fei Yang, Sheng Hua Liu
Summary: A pair of new chiral molecules, (S)-4 and (R)-4, have been designed and synthesized by introducing valine-containing groups at symmetrical positions on the periphery of an indolo[3,2-b]carbazole unit. These molecules exhibit aggregation-induced circular dichroism (AICD) properties in DMF/water mixtures, and in a mixture with 99% water fraction, they show strong, mirror-image, blue circularly polarized luminescence (CPL) signals.
JOURNAL OF LUMINESCENCE
(2024)