Article
Chemistry, Inorganic & Nuclear
Yonghong Qin, Fen Zhong, Yinan Bian, Shruti Hariyani, Yaxin Cao, Jakoah Brgoch, Takatoshi Seto, Mikhail G. Brik, Alok M. Srivastava, Xicheng Wang, Yuhua Wang
Summary: A new rare-earth-free, red-emitting phosphor Li2MgHfO4:Mn4+ was developed for temperature sensing, demonstrating excellent sensitivity and reliability. Experimental and theoretical analyses revealed the underlying mechanism of its sensitive temperature-dependent luminescence, and its ability to recover performance after heating-cooling cycles, highlighting its practical significance.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Guixian Li, Gan Li, Qinan Mao, Lang Pei, Hua Yu, Meijiao Liu, Liang Chu, Jiasong Zhong
Summary: Introducing smaller Mg2+ ions to replace Ca2+ site in the BaLaCaSbO6 matrix leads to a significant enhancement in luminescence intensity, red-shift, and luminescence lifetime. These modulations are mainly attributed to the strengthen pressure on the local structure, superior lattice rigidity, and suppression of non-radiative transition after the substitution of smaller Mg2+. The effective lifetime-based luminescence thermometry is achieved due to thermal quenching behavior of Mn4+ ions in the matrix.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Dong Li, Yuexiao Pan, Xunan Wei, Jun Lin
Summary: The paper introduces a new red phosphor CsNaGexSn1-xF6:Mn4+ synthesized at room temperature, with controllable lattice structure by adjusting the ratio of central ions Ge4+/Sn4+. A strategy to improve the humidity resistance of Mn4+ doped phosphors is explored through surface modification, restoring the quenched luminescence. These findings establish the tunable mechanism between luminescence performance and microstructure, suggesting a feasible approach for enhancing the stability of double-composite fluoride phosphors doped with Mn4+.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Qilin Yang, Haifeng Zhe, Jiaojiao Yang, Qiang Zhou, Huaijun Tang, Zhengliang Wang
Summary: A new red phosphor Rb2TaF7:Mn4+ was successfully prepared using the co-precipitation method. Under blue light excitation, this phosphor exhibits a series of red-emitting peaks attributed to the specific transitions of Mn4+. The non-equivalent Mn4+ doping system also presents a strong zero-phonon line. By applying Rb2TaF7:Mn4+ to white light-emitting diodes (w-LEDs), a high-brightness white light with a high color temperature and good color rendering ability can be achieved.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Weihao Wang, Quanfeng Li, Liyan Chen, Yanhui Wang, Rubing Zhong, Huiwan Dong, Yijun Qiu, Yifan Hu, Xiulian Zhang
Summary: The Ba2LaNbO6: Mn4+ phosphor was synthesized and its crystal structure was characterized. The luminescent spectra were used to calculate the values of Dq, Racah parameters B and C, and the nephelauxetic effect parameter beta(1) of Ba2LaNbO6: Mn4+. The temperature-dependent spectra showed the thermal quenching of Mn4+ emission in Ba2LaNbO6: Mn4+ phosphors. The fluorescence lifetime-based optical temperature measurement was analyzed. The results suggested that Ba2LaNbO6: Mn4+ phosphor has potential in optical thermometry.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Junshan Hu, Ruonan Wang, Ziqian Wei, Xiao Wu, Fengyi Wang, Lixin Liu, Yanzhuo Li, Hao Fu, Qing-Hua Xu
Summary: Yb3+/Er3+ co-doped beta-Ba2ScAlO5 phosphors with strong red emission and temperature-dependent properties have been prepared through equivalent substitution strategy. The red-green integrated intensity ratio can reach up to 82.5, and the red emission mechanism mainly arises from energy transfer. The optimized doping concentrations of Yb3+ and Er3+ show linear relationship with temperature, indicating potential application in optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Ayu Nakagawa, Hirotoshi Nakabayashi, Yoshinori Nishiwaki, Shuhei Ogo, Tadaharu Ueda, Takuya Hasegawa
Summary: CAZ:Mn phosphor with deep-red luminescence was successfully synthesized using the coprecipitation method. Its luminescence intensity was 2.1 times higher than that of the phosphor prepared by the solid-state reaction method. The waterproof CAZ:Mn phosphor with high luminescence intensity was achieved by SiO2 modification.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Haiyan Wu, Guang Zhu, Jian Zhang, Hui Xie, Tao Tan, Yan Gao, Lihong Jiang, Chengyu Li, Hongjie Zhang
Summary: A new type of narrow-band red phosphor LKTGO:Mn4+ was synthesized, which has a wide excitation band and strong red emission. It can be effectively excited by near ultraviolet (n-UV) and blue light, making it suitable for blue InGaN chip excitation. The LKTGO:Mn4+ phosphor shows potential applications in warm white LEDs.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Xinyue Liu, Youzhen Shi, Kang Cheng, Xinyong Gong, Weichao Huang, Chaoyong Deng
Summary: A novel far-red emitting phosphor Na0.2La0.2Sr1.6MgWO6:Mn4+ was successfully fabricated through high-temperature solid-state reaction, and its photoluminescence excitation and emission spectra were analyzed in detail. The phosphor exhibited effective far-red light at 691 nm when excited by 350 nm or 467 nm. By partial substitution of [Na+-La3+] unit for [Sr2+-Sr2+] unit, the far-red emission intensity of Sr2MgWO6:0.006Mn4+ was improved by about 60.5 times. Furthermore, the obtained phosphor showed high thermal stability with a value of I373K/I298K approximately 46.59% of that at room temperature. Additionally, there was a broad spectral overlap between the emission band of Na0.2La0.2Sr1.6MgWO6:Mn4+ phosphor and the absorption band of phytochrome PFR under near-ultraviolet light spectrum. Therefore, it has the potential to be a new type of far-red luminescent powder for indoor plant growth LEDs.
Article
Materials Science, Multidisciplinary
Guna Doke, Guna Krieke, Andris Antuzevics, Anatolijs Sarakovskis, Baiba Berzina
Summary: Materials with persistent luminescence (PersL) have attracted significant interest, especially in the blue and green spectral regions. However, there is limited research on the afterglow in the red spectral range. In this study, manganese doped Mg2SiO4, Mg2GeO4, and their solid solutions were prepared and analyzed comprehensively. The materials exhibited bright red persistent luminescence, with the best phosphor showing an afterglow for more than 16 hours. The analysis revealed the presence of multiple trap centers and charge traps associated with trapped hole and trapped electron centers, contributing to the PersL processes.
Article
Optics
Junheng Yuan, Xinyi Yang, Tong Li, Yanqing Ye, Qin Wang, Yayun Zhou, Qiang Zhou, Zhengliang Wang
Summary: In this paper, a new red-emitting phosphor BGFM was successfully synthesized and its crystal structure and luminescence properties were studied. The results show that BGFM has a high internal quantum efficiency and good color stability, making it a potential candidate for white LED application.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Ceramics
Zhaowu Wang, Haipeng Ji, Zongtao Zhang, Jian Xu, Deliang Chen
Summary: This study discusses the challenges and solutions of using the cation exchange method to dope Mn4+ into Na2SiF6 single crystals for synthesizing white LED phosphors, resulting in Na2SiF6 single crystals with intense emission peaks.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Qiang Zhou, Jing Wan, Yayun Zhou, Shuai Zhang, Dongxin Shi, Xiaoling Xie, Haiqi Pu, Yanqing Ye, Zhengliang Wang
Summary: This study presents a new red-emitting phosphor RLGFM with an ultraintense ZPL emission and investigates its spectral characteristics and color gamut expansion capability. A comprehensive investigation on thermal quenching behavior provides detailed insights into developing novel Mn4+ red phosphors for high-quality backlight display applications.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Konglan Chen, Shiyu Jia, Zifan Shao, Xinxin Han, Jian Yuan, Yayun Zhou, Tingting Deng
Summary: In this study, a dual-emission fluoride phosphor, BaTaF7:Mn4+, was synthesized and its electronic structure and luminescence properties were investigated using density functional theory (DFT) calculations. The results showed that the unique dual emission and short fluorescence lifetime of the phosphor were due to the distortion of the local environment of Mn4+ ions, which tend to substitute for Ba2+ and Ta5+ in the host lattice. The white LED with BTF phosphor encapsulation achieved a high color gamut of 113.4% NTSC through RGB spectral filtering, suggesting its potential for display backlighting sources.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Sibel Oguzlar, Merve Zeyrek Ongun, Irmak Dogan Tunc, Mustafa Erol
Summary: CaAl12O19:Mn4+ phosphor (CAO:Mn) is an important candidate for red-emitting materials in white light-emitting diodes (wLEDs) due to its advanced color rendering and large absorption band. Many researchers have studied the improvement of its optical properties by using different dopants and additives. In this study, the addition of ZnO NWs/CFs, Al-ZnO NWs/CFs, and K-ZnO NWs/CFs additives resulted in a significant increase in the emission intensity of CAO:Mn phosphor.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Aleksandar Ciric, Stevan Stojadinovic, Miroslav D. Dramicanin
Summary: 15 mu m thick Ti-Sapphire coatings were successfully synthesized using plasma electrolytic oxidation (PEO) method on pure aluminum substrates with the addition of TiO2 particles. The coatings exhibit typical Ti-Sapphire photoluminescence features and show potential as multifunctional barrier-level optical temperature sensor materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Aleksandar Ciric, Tukasz Marciniak, Miroslav D. Dramicanin
Summary: In this study, a novel temperature readout method utilizing thermalized energy levels in trivalent lanthanide ion-activated phosphors is proposed to overcome the sensitivity limitation of ratiometric luminescence thermometers. The method, called luminescence intensity ratio squared (LIR2), combines the advantages of dual-excitation single emission band ratiometric (SBR) and conventional luminescence intensity ratio (LIR) techniques. The LIR2 method demonstrates significantly enhanced thermometric performance compared to SBR and LIR techniques over a wide temperature range (300-850 K).
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Jovana Peris, Vesna Dordevic, Zoran Ristic, Mina Medic, Sanja Kuzman, Zeljka Antic, Miroslav D. Dramicanin
Summary: The potential of Eu3+, Mn4+ co-doped YAG for dual-activated luminescence intensity ratio thermometry is investigated. The samples were prepared and characterized, and the optimal concentrations of Mn4+ and Eu3+ were determined. Sensitivities were calculated using luminescence intensity ratio as the indicator of temperature.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Crystallography
Yin-Pai Lin, Dmitry Bocharov, Eugene A. Kotomin, Mikhail G. Brik, Sergei Piskunov
Summary: Real-time time-dependent density-functional theory calculations were used to analyze the optical property and charge transitions of a single noble metal atom deposited on rutile TiO2(110) surface. Absorption spectra were calculated for all model structures, and transition contribution maps were computed to provide deeper insight into photo-absorption processes. The results revealed the accumulation of photogenerated electrons around the deposited gold atoms in TiO2, which is important for the design strategy of future photocatalytic materials.
Article
Multidisciplinary Sciences
M. Ya Rudysh, N. Y. Ftomyn, P. A. Shchepanskyi, G. L. Myronchuk, A. Popov, N. Lemee, V. Y. Stadnyk, M. G. Brik, M. Piasecki
Summary: A comprehensive theoretical study has been conducted on the structure, electronic, optical, and elastic properties of the ternary semiconductor silver thiogallate crystal AgGaS2. The study establishes a structure-properties relationship and efficiently resolves discrepancies between experimental and calculated data. Additionally, the study calculates the linear electro-optic properties, electrogyration coefficients, and second-order nonlinear optical coefficients of AgGaS2 crystals.
ADVANCED THEORY AND SIMULATIONS
(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
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
Energy & Fuels
Jurij Grechenkov, Aleksejs Gopejenko, Dmitry Bocharov, Inta Isakovica, Anatoli I. Popov, Mikhail G. Brik, Sergei Piskunov
Summary: In this study, we investigated the less studied solid solutions of CuGaS2, AgGaS2, and CuGaSe2 chalcopyrites using ab initio methods. Our theoretical simulations indicate that excess of In and Se in the solid solutions leads to band gap narrowing and broadening of the absorption spectra. These findings suggest potential photovoltaic applications for these compounds and demonstrate the usefulness of our developed methodology for further study of other promising chalcopyritic compounds.
Article
Genetics & Heredity
Andrea Pirkovic, Vesna Lazic, Biljana Spremo-Potparevic, Lada Zivkovic, Dijana Topalovic, Sanja Kuzman, Jelena Antic-Stankovic, Dragana Bozic, Milica Jovanovic Krivokuca, Jovan M. Nedeljkovic
Summary: Dry olive leaf extract (DOLE) and its active component oleuropein (OLE) were used to synthesize colloidal silver nanoparticles (Ag NPs) with a size range of 20-25 nm. The cytotoxicity, genotoxicity, and antimicrobial activity of these Ag NPs were evaluated. The results showed that Ag/OLE exhibited the highest cytotoxicity, while Ag/DOLE and Ag/OLE did not induce genotoxic effects. Ag/OLE also demonstrated superior antimicrobial activity against different microorganisms compared to Ag/DOLE. However, the high concentrations of Ag/OLE could induce cytotoxicity in healthy human cells, suggesting potential risks.
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
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)
