Article
Materials Science, Ceramics
DanYu Zhang, YuXuan Luo, ShuJun Xu, LianJie Li, JunYu Chen, Lei Lei, Hai Guo
Summary: In this paper, a Y4GeO8:Bi3+,Eu3+ phosphor with dual emission centers was synthesized using solid-state reaction technology. The structure, morphology, and luminous properties of the phosphor were investigated, and its potential applications in optical thermometry were explored using fluorescence intensity ratio and thermochromic techniques. The Y4GeO8:Bi3+,Eu3+ phosphor exhibited broadband emission from Bi3+ ions and characteristic emission peaks from Eu3+ ions under 290 and 347 nm excitation. It showed excellent temperature-sensing capabilities, with a maximum relative sensitivity of 1.51% K-1 (λ(ex) = 290 nm). The emitted color of the phosphor shifted from faint yellow to red with a high chromaticity shift (0.180) as the temperature increased from 303 to 513 K, which could be easily distinguished by the naked eye. The results suggested that the Y4GeO8:Bi3+,Eu3+ phosphor has potential applications in optical temperature measurement and high-temperature safety marking.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
A. M. Voiculescu, S. Hau, G. Stanciu, C. Gheorghe
Summary: A series of Eu3+ doped SrLaGaO4 ceramic phosphors were successfully synthesized, and their optical properties were investigated. The samples showed strong red emission at 620 nm under blue and UV excitation, with a good color purity of 88% for the 10Eu: SrLaGaO4 phosphor. The temperature-dependent luminescence intensity ratio of the samples suggested that the 10Eu: SrLaGaO4 phosphor could be used as a temperature sensor over a wide range of temperatures and as a narrow-band red-emitting phosphor for pc-WLEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Optics
Pengfei Yu, Ruirui Cui, Gangyi Zhang, Jun Zhang, Chaoyong Deng
Summary: A series of Sr3In2WO9:xSm3+ (x = 0.02, 0.03, 0.04, 0.05, and 0.06) and Sr3In2WO9:0.04Sm3+, yEu3+ (y = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, and 0.35) phosphors were synthesized by solid-state reaction method. Then the microstructure and optical properties of samples were tested by the corresponding means. The results show that the optimal doping concentration of single-doped Sm3+ phosphor is x = 0.04 and the performance of Sm3+/ Eu3+ co-doped phosphors has been improved.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xiuying Tian, Lejia Guo, Jin Wen, Ling Zhu, Changyan Ji, Zhi Huang, Huating Qiu, Fei Luo, Xin Liu, Jing Li, Chunyan Li, Yangxi Peng, Jianhui Cao, Zhiyuan He, Hongbin Zhong
Summary: SrMoO4: Sm3+ phosphors with orange red-emitting properties were synthesized using a solid-phase method for temperature measurement applications. The phosphors had a scheelite structure belonging to the tetragonal system and I41/a space group. Sm3+ ions were successfully incorporated into the SrMoO4 lattice. The phosphors exhibited irregular microparticles with well-crystallized pomegranate seed-like morphology, and Sm3+ ions were evenly distributed in the SrMoO4 matrix. The appropriate quenching concentration of Sm3+ was found to be 1.0%, and the phosphors showed excellent thermal stability and anti-thermal quenching properties. A new dual-model thermometry strategy based on exponential function and modified Boltzmann population distribution was proposed, and the phosphors demonstrated absolute sensitivities of 0.108 K-1 and relative sensitivities of 0.601% K-1. The findings highlight the potential applications of SrMoO4: Sm3+ phosphors in pc-WLEDs and optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
Guixian Li, Yu Xue, Qinan Mao, Lang Pei, Hong He, Meijiao Liu, Liang Chu, Jiasong Zhong
Summary: Luminescent thermometers provide a non-contact method of probing temperature with high sensitivity and response speed at the nanoscale. By co-doping the highly temperature-sensitive Mn4+ and less-sensitive Eu3+ (or Sm3+) activators into a Ca2GdSbO6 matrix, an effective thermometer is formed.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
S. Ling, F. B. Xiong, W. B. Yang, H. F. Lin, W. Z. Zhu
Summary: Novel red-emitting phosphors Sr7Sb2O12: Sm3+ and Sr7Sb2O12: Sm3+, Eu3+ were synthesized and characterized. Energy transfer between Sm3+ and Eu3+ ions in Sr7Sb2O12 was achieved with a transfer efficiency of 42.4%. The phosphor exhibited good thermal stability and produced white light when combined with near-UV or blue chips in LED lamps.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Prashant Kumar Pandey, Prashant Dixit, Vaibhav Chauhan, Praveen C. Pandey
Summary: The advent of innovative rare-earth based metal oxide phosphors has prompted increasing interest in the search for highly efficient red emitting phosphors. In this study, a series of doped and co-doped Bi2O3 red phosphors were synthesized by a facile urea assisted auto-combustion process. The synthesized phosphors showed a tetragonal crystal structure and exhibited tunable emission colors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Applied
Reziwanguli Yantake, Aierken Sidike, Taximaiti Yusufu
Summary: This study presents the photoluminescence characteristic analysis of a series of red phosphors of KAlSiO4:1.5 mol%Sm3+,x mol%Eu3+ (x = 2, 3, 4, 5, 6, 7) prepared via high-temperature solid-phase reaction. The results show that the X-ray diffraction (XRD) refinement results are reliable. The unit cell parameters and volume gradually decrease as the Eu3+ concentration increases, resulting in a grain size reduction of 10.22%. When x = 6, the emission peaks of Sm3+ at 564, 601, and 651 nm disappear completely, and the corresponding full width at half maximum becomes 0. At 610 nm, the emission peak intensity of Eu3+ is increased by a factor of 4.8. The resonant non-radiative energy transfer effect is greater than the co-excitation effect. A maximum energy transfer efficiency of 97.8% is achieved.
JOURNAL OF RARE EARTHS
(2022)
Article
Physics, Condensed Matter
Ilya E. Kolesnikov, Elena Afanaseva, Mikhail A. Kurochkin, Evgenii Yu Kolesnikov, Erkki Lahderanta
Summary: A novel mixed-valent Eu2+/Eu3+-doped MgAl2O4 phosphor is reported as a ratiometric thermal sensor, offering high thermal sensitivity and temperature resolution, making it a promising material for optical thermometry.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Rajan Singh, A. K. Bedyal, M. Manhas, H. C. Swart, Vinay Kumar
Summary: A series of Sm3+ doped and Li+/Na+/K+ co-doped CaSr2(PO4)(2) phosphors were synthesized and investigated for their luminescence and thermometric properties. The results showed that co-doping with alkali metal ions significantly enhanced the fluorescence intensity and the phosphors exhibited high thermal stability and good temperature sensitivity. These phosphors have potential applications in high power light emitting diodes and optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
S. N. Ogugua, L. J. B. Erasmus, H. C. Swart
Summary: This paper reports on the luminescence and thermometric properties of Ca4(PO4)2O:Eu. The emission of Eu2+ showed blue and red bands, while Eu3+ exhibited yellow and red lines. The thermometric properties in different spectral ranges were studied using the luminescence intensity ratio method. Average temperature sensitivities of 1.76%, 0.1%, 0.11%, and 0.11%/°C were obtained in the blue-green, yellow, red, and near-infrared spectral ranges, respectively. The material could be potentially used in low-temperature thermal imaging applications.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Mengmeng Fu, Qi Wu, Chenzhang Gu, Shanshan Hu, Shuang Lu, Baolong Wang, Ying Hong, Yinzhen Wang
Summary: Sm3+ and Sm3+/Eu3+ co-doped LGBO powders were prepared and their micro-structure, luminescent characteristics, energy transfer and fluorescence lifetimes were studied. Under 278 nm excitation, Gd3+ absorbed and transferred energy to enhance the luminescent intensity of Sm3+ at 567, 611, and 649 nm. Under 405 nm excitation, the emission spectra of Sm3+/Eu3+ co-doped LGBO phosphors showed yellow-orange and red light corresponding to the transitions of Sm3+ and Eu3+, respectively. The energy transfer mechanism was analyzed, and the energy transfer efficiency was calculated to be 31.2% at a Sm3+ concentration of 4mol%. LGBO: Sm3+/Eu3+ phosphors have promising applications in solid-state lighting, display devices, bio-imaging, etc.
Article
Chemistry, Multidisciplinary
Shaokun Ling, Xiaoyan Qin, Yifeng Yan, Chang Chen, Kai Meng, Junyun Ming, Sen Liao, Yingheng Huang, Lei Hou
Summary: In this study, a novel phosphor with superior thermal stability and negative thermal quenching performance was synthesized via a one-step hydrothermal method. The phosphor showed a remarkable improvement in luminous thermal stability supported by negative thermal quenching, and its emission spectrum remained unchanged at high temperature, indicating its promising prospect for practical application.
Article
Chemistry, Physical
Mingjun Song, Weiguang Ran, Yang Ren, Lintong Wang, Wang Zhao
Summary: Color-tunable luminescent materials based on multi-emitting centers, such as La2LiNbO6:Bi3+, Eu3+, have attracted attention for their potential applications in display, lighting, and temperature sensing. This research explores the band structure, luminescence properties, and temperature-sensitive behaviors of the novel phosphor, highlighting efficient energy transfer between Bi3+ and Eu3+ ions. Preliminary evaluation of the La2LiNbO6:Bi3+, Eu3+ phosphor in WLED demonstrates its promising performance in terms of photoelectric parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Nguyen Van Hai, Nguyen Thi Khanh Linh, Dinh Thi Hien, Bui Thi Hoan, Nguyen Minh Tu, Vuong-Hung Pham, Duy-Hung Nguyen, Vu Tuan Anh, Hoang Nhu Van
Summary: High-efficiency energy transfer from Sm3+ to Eu3+ was achieved in CeO2 phosphors, leading to improved emission efficiency of Eu3+. The experimental results confirmed the high-efficiency energy transfer and investigated various properties of the synthesized phosphors.
Article
Engineering, Environmental
L. Marciniak, W. Piotrowski, M. Szalkowski, V. Kinzhybalo, M. Drozd, M. Dramicanin, A. Bednarkiewicz
Summary: A novel class of highly sensitive thermographic phosphors operating in room temperature range with sub-kelvin thermal resolution has been demonstrated. The luminescence properties of optically active europium ions in nanocrystalline host materials were found to be highly susceptible to phase transitions, providing insights into phase transition based luminescence nanothermometry.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
W. Piotrowski, M. Kuchowicz, M. Dramicanin, L. Marciniak
Summary: The substitution of Sr2+ by trivalent lanthanide ions in SrTiO3 nanocrystals enhances Ti3+ near-infrared emission, leading to the development of highly sensitive luminescent nanothermometers with exceptional repeatability in measurements.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Bojana Milicevic, Yingyuan Chen, Junhao Li, Miroslav D. Dramicanin, Jianbang Zhou, Mingmei Wu
Summary: This study demonstrates the preparation of Mn4+-activated K2TiF6 phosphor using an organic solvent-assisted co-precipitation strategy, where the particle size can be controlled by selecting organic solvents with different carbon chain lengths. The addition of n-butanol during synthesis was found to significantly increase the emission intensity of K2TiF6:Mn, leading to a much higher photoluminescence quantum efficiency compared to conventionally prepared phosphors. These findings not only provide a way to prepare targeted morphology K2TiF6:Mn phosphor with high quantum efficiency, but also offer a potential route for optimizing other Mn4+-activated fluoride phosphors for white light-emitting diodes.
DALTON TRANSACTIONS
(2022)
Article
Optics
B. Kahouadji, L. Guerbous, Dragana J. Jovanovic, Miroslav D. Dramicanin
Summary: The temperature-dependence of red emission from YPO4:0.1% Pr3+ nanopowders was investigated to compare the spectroscopic properties between nanosized and single crystal forms. The differences were observed in emission intensity, phonon-assisted non-radiative transitions, and multiphonon relaxation processes between 3P0 and 1D2 levels. Furthermore, the potential application of YPO4:0.1% Pr3+ in nano-thermometry in the temperature range of 10-300 K was explored.
JOURNAL OF LUMINESCENCE
(2022)
Article
Crystallography
Milica Sekulic, Tatjana Dramicanin, Aleksandar Ciric, Ljubica Dacanin Far, Miroslav D. Dramicanin, Vesna Dordevic
Summary: Eu3+-doped YxLu1-xNbO4 materials with different compositions were prepared by solid-state reaction method. It was found that the emission spectra showed a slight linear variation with the solid-solution composition in terms of Y/Lu content. Refractive index and Judd-Ofelt parameter were estimated, showing that LuNbO4:Eu3+ is a more efficient phosphor than YNbO4:Eu3+.
Article
Materials Science, Ceramics
Lj Dacanin Far, A. Ciric, Z. Ristic, J. Perisa, T. Dramicanin, S. R. Lukic-Petrovic, M. D. Dramicanin
Summary: Y3NbO7:Eu3+ powders were synthesized and characterized, revealing concentration quenching of the luminescence when the Eu3+ concentration exceeds 3%. Multipolar interaction was predicted as the dominant mechanism. The powder exhibits strong orange/red luminescence and high intrinsic quantum yield.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
K. Maciejewska, P. Szklarz, A. Bednarkiewicz, M. D. Dramicanin, L. Marciniak
Summary: This study demonstrated that temperature-driven irreversible structural phase transformations in Eu3+ activated LaPO4, La0.5Y0.5PO4, and YPO4 nanocrystals can be utilized for thermal history measurements in the temperature range of 200°C-1000°C. The changes in Eu3+ local surroundings due to temperature increase modified the intensity and emission spectra, and the intensity ratio of Eu3+ 5D0 -> 7F2 to 5D0 -> 7F1 emissions served as a highly-sensitive indicator of the highest temperature experienced by the nanocrystals. The proposed ratiometric readout strategy enhanced the accuracy of thermal history analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
A. V. Racu, Z. Ristic, A. Ciric, V. Dordevic, G. Buse, M. Poienar, M. J. Gutmann, O. Ivashko, M. Stef, D. Vizman, M. D. Dramicanin, M. Piasecki, M. G. Brik
Summary: This study investigates the correlation between optical properties, local symmetry, and crystal structure in CaF2 and BaF2 fluoride crystals doped with ErF3. The differences in optical properties between CaF2 and BaF2 crystals at room temperature are observed and attributed to the differences in cationic radius and dopant-host ionic radius. The determined symmetries and bond lengths of Er3+- F- ions in both crystals are reported. This study provides valuable insight into the development of lanthanide-doped optical materials.
Article
Optics
Ljubica Dacanin Far, Aleksandar Ciric, Milica Sekulic, Jovana Peris, Zoran Ristic, Zeijka Antic, Miroslav D. Dramicanin
Summary: YNbO4:xEu3+ powders with varying concentrations (0.1, 0.25, 0.5, 0.75, 1, 3, 5, 7.5, 10, 15, 20 mol %) were synthesized through a solid-state reaction and homogenization in a vibrational mill. The samples exhibited a monoclinic Fergusonite-beta-(Y) structure (C2/c space group) with crystallite sizes ranging from 45-65 nm. The samples showed strong orange/red luminescence with 5D0 excited state lifetimes of approximately 0.6 ms. Photoluminescence emission spectra indicated no concentration quenching within the examined concentration range. Judd-Ofelt intensity parameters showed a slight increase with increasing concentration, reaching a maximum of Omega(2) = 8.13 × 10(-20) cm(2), Omega(4) = 2.67 × 10(-20) cm(2), and an invariant value of Omega(6) at 0.35 × 10(-20) cm(2). The emission lifetimes of the 5D0 state remained nearly constant at around 0.6 ms with a slight decrease at the highest concentrations. The intrinsic quantum yield for all samples was approximately 0.5.
Article
Materials Science, Multidisciplinary
Wojciech M. Piotrowski, Riccardo Marin, Maja Szymczak, Emma Martin Rodriguez, Dirk H. Ortgies, Paloma Rodriguez-Sevilla, Miroslav D. Dramicanin, Daniel Jaque, Lukasz Marciniak
Summary: Lifetime-based luminescence thermometry enables accurate deep-tissue monitoring of temperature changes, but short lifetimes and poor brightness limit its performance. A solution to these limitations is the design and optimization of luminescent nanothermometers co-doped with transition metal and lanthanide ions, which exhibit strong near-infrared emission and long temperature-dependent photoluminescence lifetime. These nanothermometers, combined with a custom-made instrument, allow for obtaining 2D thermal maps for deep-tissue thermal mapping. This study provides foundations for the deployment of lifetime-based thermometry for accurate deep-tissue temperature monitoring.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Bojana Milicevic, Jovana Perisa, Zoran Ristic, Katarina Milenkovic, Zeljka Antic, Krisjanis Smits, Meldra Kemere, Kaspars Vitols, Anatolijs Sarakovskis, Miroslav D. D. Dramicanin
Summary: We present a hydrothermal synthesis method for ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. By varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) and Tm3+ (y = 0.75, 1, 2, and 3 mol%), the emissions in the near IR spectral range were analyzed. Structural analysis revealed that Yb3+ and Tm3+ occupy the La3+ sites in the SLF host. The addition of Yb3+/Tm3+ ions significantly affected the lattice constant, particle size, and PL emission properties of the synthesized SLF nanophosphor. The optimal dopant concentrations for upconversion luminescence were found to be 20 mol% Yb3+ and 1 mol% Tm3+ with EDTA as the chelating agent. Strong upconversion emission of Tm3+ ions around 800 nm was achieved under 980 nm light excitation. The study suggests potential applications of ultrasmall Yb3+/Tm3+ co-doped SLF phosphors in fluorescent labels for bioimaging and security.
Article
Biophysics
Jelena Papan Djanis, Jovana Perisa, Patricija Hribar Bostjancic, Katarina Mihajlovski, Vesna Lazic, Miroslav Dramicanin, Darja Lisjak
Summary: Colloidal stabilization is crucial for the preparation of magnetic nanoparticles for biomedical applications. In this study, tannic acid was used as a coating for barium hexaferrite nanoplatelets (BSHF NPLs) to achieve stability in aqueous media. The coated BSHF NPLs were characterized and their magnetic properties were measured. The stable colloids were tested in biological media, and the antimicrobial properties were examined. To enhance antimicrobial activity, tannic acid was used as a platform for the in-situ production of silver on BSHF NPLs. The hybrid material exhibited magnetic properties and excellent antimicrobial activity against Escherichia coli and Staphylococcus aureus.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Chemistry, Analytical
Tahani A. Alrebdi, Abdullah N. Alodhayb, Zoran Ristic, Miroslav D. Dramicanin
Summary: In this study, the performance of single- and multiparametric luminescence thermometry based on the temperature-dependent spectral features of Ca6BaP4O17:Mn5+ near-infrared emission was investigated. Experimental results showed that as the temperature increased, the intensities of the T-3(2) and Stokes bands increased, while the peak of the E-1 emission band redshifted. The multiparametric luminescence thermometry showed comparable performance to the best single-parameter thermometry.
Article
Physics, Multidisciplinary
Maja S. Rabasovic, Svetlana Savic-Sevic, Janez Krizan, Branko Matovic, Marko Nikolic, Dragutin Sevic
Summary: This paper explores the potential applications of machine learning algorithms in the analysis of optical spectra from Gd2O3:Er,Yb thermophosphor. By training computer software to recognize time-resolved spectra associated with different temperatures, remote temperature estimation can be achieved using deep learning artificial neural networks.
Article
Materials Science, Ceramics
Tijana Stamenkovic, Nadezda Radmilovic, Marko Nikolic, Jelena Ercic, Vesna Lojpur
Summary: This manuscript examines the down-conversion nanopowders of SrGd2O4 doped with different concentrations of Dy3+ or Sm3+ ions in detail. The samples were prepared using the glycine-assisted combustion method and characterized using various techniques. The results demonstrate the influence of dopant concentration on the luminescent properties of SrGd2O4.
SCIENCE OF SINTERING
(2022)
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)
