Article
Optics
C. E. Rivera-Enriquez, A. L. Fernandez-Osorio
Summary: This study successfully synthesized YVO4:Eu3+ nanophosphors with an average crystallite size of only 6 nm using a simple chemical method, overcoming previous difficulties in synthesis and offering new possibilities for the application of nanophosphors.
JOURNAL OF LUMINESCENCE
(2021)
Article
Computer Science, Hardware & Architecture
Yatish R. Parauha, D. K. Halwar, S. J. Dhoble
Summary: The present investigation focuses on the development of Eu3+ activated phosphors for near ultraviolet (NUV) excited light emitting diode (LED) applications. A series of Na2CaSiO4: Eu3+ phosphors were synthesized and analyzed. The phosphors showed strong emission intensity and an orange emission peak at 595 nm under 396 nm excitation, with high color purity.
Article
Chemistry, Analytical
Chandrahasya M. Nandanwar, Atul N. Yerpude, Namdeo S. Kokode, Sanjay J. Dhoble
Summary: The synthesis of BiPO4:Eu3+ phosphors was successfully achieved using a wet chemical process. X-ray diffraction patterns confirmed good matching between the prepared samples and the standard BiPO4 structure. The highest excitation intensity was observed at 395 nm, leading to characteristic emission peaks at 592 nm and 616 nm. Concentration quenching occurred at a Eu3+ ion concentration of 0.5 mol%. The particles had a micrometre size range. The prepared phosphor shows potential for use in white light-emitting diodes.
Article
Engineering, Electrical & Electronic
C. M. Nandanwar, N. S. Kokode, A. N. Yerpude, S. J. Dhoble
Summary: The synthesis of LaPO4:RE (RE = Dy3+, Eu3+, Sm3+) phosphors via a wet chemical method was reported. XRD characterization and photoluminescence studies were conducted. Different transitions were observed for each RE-doped phosphor under UV or visible light excitation. The results suggest their potential applications in n-UV-excited solid-state lighting.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Lou Sangang, Xiao Xuan, Jiao Yu, Hu Chengxiao, Qiu Kehui
Summary: Novel CaLax(MoO4)(1.5x+1):Eu3+ and CaLa0.6(MoO4)(1.9):Eu3+,Bi3+ phosphors were synthesized via the combustion method. The CLMO:Eu3+ phosphor exhibited the strongest red emission intensity, with the highest emission peak at 618 nm attributed to the D-5(0)-> F-7(2) transition of Eu3+. Co-doping with Bi3+ improved the red emission intensity, with maximum luminescence intensity achieved at 4 mol% Bi3+.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Spectroscopy
Ziyao Wang, Jian Chen, Yangai Liu, Xuezhu Luan, Guofeng Ma
Summary: In this study, a color-tunable green-orange-emitting phosphor Ba3Lu4O9:Bi3+,Eu3+ was successfully prepared by introducing Bi3+ and Eu3+ into the host lattice. The emission spectra cover the whole visible region and show typical emissions from both Bi3+ and Eu3+, with the emitting color being tunable. Energy transfer behavior in the phosphor was confirmed, resulting in improved emission intensity of Eu3+. Moreover, composite films made with the phosphor show promising potential for near-UV pumped lighting and flexible devices.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Physical
Prashant M. Kakade, Avinash R. Kachere, P. D. Sahare, Alka Deshmukh, S. D. Dhole, Sandesh R. Jadkar, Nandkumar T. Mandlik
Summary: Europium doped Yttrium oxide (Y2O3) nanophosphors were successfully synthesized using a simple and efficient sol-gel method. The material exhibited a highly crystalline cubic structure with spherical particles of size around 10-20 nm. Optimizing the luminescence properties revealed maximum thermoluminescence (TL) sensitivity at 1600 degrees C with 10.0 M% Eu doping, while maximum photoluminescence (PL) intensity was achieved after annealing the nanophosphor at 1200 degrees C. The material showed strong red emission under UV and visible light excitation, with a sharp peak at 612 nm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Optics
Yaqian Hu, Xiangping Li, Ke Wang, Zhipeng Guan, Hongquan Yu, Yinghui Zhang, Sai Xu, Baojiu Chen
Summary: Bi3+, Sm3+ co-doped YVO4 phosphors with fixed Bi3+ concentration and variable Sm3+ concentrations were synthesized by high-temperature solid-state method. The crystal structure of the obtained samples was revealed through X-ray Rietveld refinement. The luminescence properties of dopant ions and matrix were analyzed by fluorescence spectroscopy, and the mechanism of concentration quenching phenomenon and energy transfer behavior among the matrix and dopant ions were investigated. Moreover, the dependence of the luminescence properties of Bi3+ and Sm3+ on temperature was also studied. The red shift of the broad excitation band and the variation of the relative luminescence intensity of the dopant ions caused by the temperature were observed. Both of them were conducive to temperature sensing, and high temperature sensitivities were obtained, confirming that Bi3+, Sm3+ co-doped YVO4 phosphors may serve as a good non-contact thermometer. Additionally, the light color of the samples changed in a wide range as Sm3+ concentration and temperature rose.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Liandong Guo, Ting Li, Chunchun Zhu, Wenchao Liang, Lina Wu
Summary: Bi3+ and Eu3+ co-doped CaZnOS phosphors were synthesized, and their emission characteristics were investigated. The tunable emission chromaticity from cyan to red was achieved by regulating the proportion of Eu3+ in the phosphors. Moreover, the optimized concentrations of Bi3+ and Eu3+ in CaZnOS phosphors showed potential application in white light emitting diodes (W-LEDs).
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Zhicheng Liao, Liting Qiu, Qian Zhang, Xiantao Wei, Yonghu Chen, Min Yin
Summary: In recent years, there has been increasing effort to develop single-phase white phosphors for white light-emitting diodes (WLEDs) due to limitations of traditional WLEDs such as reabsorption and color deviation. A new strategy using the Bi3+-Eu3+ energy transfer in suitable single-phase phosphors has been proposed. In this study, Gd3TaO7:xBi(3+) and Gd3TaO7:0.01Bi(3+),yEu(3+) phosphors were synthesized and characterized. The results show the potential of Gd3TaO7:0.01Bi(3+),yEu(3+) phosphor as a viable candidate for WLED applications.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
O. Shantajit Singh, Ranjoy Wangkhem, N. Shanta Singh
Summary: The hydrothermally synthesized Bi3+-sensitized Y2O3:Eu3+ phosphors were characterized, revealing efficient energy transfer from Bi3+ to Eu3+ ions through dipole-dipole interactions. The selection of excitation wavelength and Eu3+ concentration in Y2O3 can provide multicolor emission and white light emission. The maximum quantum yield of 24% was observed in Bi3+ (1 at%) sensitized Y2O3:Eu3+ (2 at%).
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Siwei Gu, Zheng Lu, Shuai Zou, Chengkun Wu, Chen-wei Peng, Mengfei Ni, Zhenzhen Chen, Hao Huang, Hua Sun, Haibo Wang, Xiaohong Zhang, Xiaodong Su
Summary: This study presents a solid strategy to prepare bifunctional SiO2 coatings (BSCs) with both antireflection and luminescence downshifting properties by in situ generating YVO4:Eu3+, Bi3+ phosphors in SiO2 antireflection coatings (ARCs). The self-prepared precursor solution of the downshifting phosphors is added to a mixture of commercial SiO2 sol solution and ethanol to uniformly coat the surface of quartz glass, resulting in a novel composite porous SiO2 coating containing in situ generated YVO4:Eu3+, Bi3+ phosphors. The SiO2@YVO4:Eu3+, Bi3+ BSCs can effectively convert ultraviolet (UV) region photons to visible photons, improving the photoelectric conversion efficiency (PCE) of tunnel oxide passivated contact solar cells and the UV stability of silicon heterojunction solar cells.
Article
Engineering, Electrical & Electronic
Renping Cao, Na Liu, Qinghu Zhong, Yafang Tu, Yongchun Xu, Haining Zhang, Wei Luo, Ting Chen
Summary: In this study, Ca3MgSi2O8:Bi3+ and Ca3MgSi2O8:Eu3+ phosphors with different doping concentrations were prepared via the high-temperature solid-state reaction method, and their crystal structure and luminescence properties were investigated. The results show the luminous performance improvement of Ca3MgSi2O8:Eu3+ phosphor through Bi3+ co-doping.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
J. Luo, K. T. Wu, Z. C. Yao, J. S. Gong, C. Y. Ni, M. Xu, W. B. Dai
Summary: Quaternary wide-band-gap oxychalcogenides, such as MZnOS (M = Ca, Sr, and Ba), have great potential in lighting/display applications due to their color-tunable photoluminescence. BaZnOS, a unique structure, shows promise as a host for these applications. By studying pristine BaZnOS, researchers found that the weak multi-colored self-PL originated from oxygen vacancies. The crystallographic occupancies of dopants Bi3+/Eu3+ and Li+ were confirmed, and tunable and thermally stable PL could be achieved by changing dopant concentrations. Li+ also acted as a charge balancer and fluxing agent. A proof-of-concept BaZnOS: Bi/Eu/Li phosphor-converted white light emitting diode was fabricated, exhibiting high CRI, low CCT, and good luminous efficiency.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Suman Devi, Shalini Kaushik, Mukesh Kumar, Hina Dalal, Sanjay Gaur, Sudesh Kumar
Summary: Europium-activated barium-strontium yttrate nanocrystals with different concentrations were successfully synthesized using a combustion method. The nanocrystals exhibited an orthorhombic crystal structure and showed bright red emission with high quantum efficiency.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Review
Chemistry, Multidisciplinary
Satoru Takeshita, Shanyu Zhao, Wim J. Malfait, Matthias M. Koebel
Summary: Chitosan, derived from food waste, is a biopolymer with high biocompatibility and easy chemical processability. Porous chitosan materials vary widely in properties, from supercritically dried mesoporous chitosan aerogels to very light freeze-dried macroporous scaffolds. Despite impressive performance at the laboratory scale, the highly porous nature of chitosan amplifies both its beneficial functionality and drawbacks, posing serious barriers to industrialization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Taishu Yoshinaga, Momoka Shinoda, Yoshiki Iso, Tetsuhiko Isobe, Akihiro Ogura, Ken-ichi Takao
Summary: This study successfully prepared CDs with narrow bandwidth fluorescent spectra and achieved emission color tuning from blue to green by selecting different solvents. The CD-dispersed polymer films showed similar solvatochromic behavior, verifying the feasibility of applying CDs to displays with a wide color gamut.
Article
Materials Science, Multidisciplinary
Shimpei Miyata, Yoshiki Iso, Tetsuhiko Isobe
Summary: The changes in photoluminescence peak width and quantum yield of CsPb(Br1-x I x)(3) nanocrystals prepared by different methods were compared. The ion-exchange method resulted in a broader peak width at higher iodide content due to the presence of a small amount of orthorhombic phase, while the hot-injection method showed a decrease in quantum yield at x = 0.5.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Takuya Matsunaga, Yoshiki Iso, Tetsuhiko Isobe
Summary: Y2O3:Bi3+,Eu3+ nanosheets were formed from Y2O3 precursor nanosheets under certain conditions, retaining the crystallographic orientation of the precursor Y2O3 nanosheets and displaying absorption and emission properties suitable for solar converters.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Shunnosuke Hase, Yoshiki Iso, Tetsuhiko Isobe
Summary: This work investigated the use of CuGaS2/ZnS quantum dots as fluorescent materials for a luminescent downshifting (LDS) layer and a luminescent solar concentrator (LSC). By adjusting the bandgap of the quantum dots, a transparent and colorless LDS layer that converted near-ultraviolet light to visible light was fabricated. The results showed that the LDS layer had a slight negative effect on the efficiency of the solar module, while it significantly improved the performance of the solar concentrator.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Ikumi Enomoto, Yoshiki Iso, Tetsuhiko Isobe
Summary: The study shows that using EVOH as a sealing material can prevent irreversible damage caused by oxygen permeation to CsPbBr3 nanocrystals, while self-recovery of optical properties was observed. In contrast, using EVA does not allow for this self-recovery.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Pengjie Song, Shunnosuke Hase, Suling Zhao, Zheng Xu, Yoshiki Iso, Tetsuhiko Isobe
Summary: In this study, CsPbCl3 quantum dots codoped with Mn2+ and Er3+ were mixed with EVA to form a luminescent downshifting layer, which effectively improved the photoelectric conversion efficiency of crystalline silicon solar cells. The synthesized CsPbCl3:Mn2+,Er3+ quantum dots showed a high photoluminescence quantum yield of 79.5% under the optimum conditions. The EVA film embedded with the optimized concentration of quantum dots (0.9 wt %) increased the short-circuit current and the photoelectric conversion efficiency of c-Si solar modules by 3.42% and 4.02%, respectively. Furthermore, the quantum dots-dispersed EVA film also demonstrated a promising application as a luminescent solar concentrator, achieving significant enhancements in short-circuit current and photoelectric conversion efficiency.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Kohei Sato, Rika Katakami, Yoshiki Iso, Tetsuhiko Isobe
Summary: Surface modification of p-phenylenediamine-derived carbon dots using 4-morpholinoaniline increased the photoluminescence quantum yield in chloroform. The improved photoluminescence quantum yield was observed only for the surface modification after the formation of the p-conjugated structure of the carbon dot core. This finding gives us an idea to design carbon dots with high photoluminescence quantum yield for color conversion in white-light-emitting diodes.
ACS APPLIED NANO MATERIALS
(2022)
Article
Multidisciplinary Sciences
Yoshiki Iso, Momoko Eri, Risako Hiroyoshi, Kensho Kano, Tetsuhiko Isobe
Summary: This study evaluated the effects of perfluorodecanoic acid (PFDA) modification on CsPb(Br,I)(3) quantum dots (QDs). The results showed that PFDA modification enhanced the photoluminescence (PL) intensity and thermal stability of the QDs, while suppressing PL degradation under heating.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Momo Shiraishi, Yoshiki Iso, Tetsuhiko Isobe
Summary: This study improved the dispersibility of quantum dots (QDs) in UV-curable resin by using the ligand exchange method, and prepared transparent fluorescent nanocomposites. The QDs modified with cydohexyl 3-mercaptopropionate (MPACH) were well dispersed in the UV-curable resin, while those modified with 3-mercaptopropionic acid (MPA) exhibited significant aggregation. The QD-MPACH nanocomposite showed high photoluminescence quantum yield (PLQY) and photostability, making it beneficial for practical applications.
Article
Materials Science, Multidisciplinary
Kensho Kano, Yoshiki Iso, Tetsuhiko Isobe
Summary: The photoinduced desorption of surface ligands leads to the photodegradation of nanophosphors by enhancing non-radiative relaxation through generating surface defects. Different surface ligands can change the photodegradation and subsequent self-recovery behaviors. The addition of perfluorodecanoic acid (PFDA) to pre-synthesized CsPbBr3 nanocrystals modified with oleic acid and oleylamine affects the photodegradation and subsequent self-recovery, with PFDA preventing self-recovery due to resistant readsorption.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Satoru Takeshita, Takumi Ono
Summary: A new type of transparent aerogels with biopolymer-polysiloxane double networks is introduced. The drawbacks of strong hydrophilicity and difficulty in achieving homogeneous nanoscale structures in biopolymer aerogels are overcome by incorporating a polysiloxane network. The resulting alginate-polymethylsilsesquioxane aerogel exhibits high optical transparency, water repellency, superinsulation properties, and improved flexibility, making it a promising material for various applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Koyo Washio, Kohei Sato, Yoshiki Iso, Tetsuhiko Isobe
Summary: Carbon dots were prepared by modifying p-phenylenediamine with trifluoroacetic acid and dispersing it in a fluoropolymer film. Unmodified carbon dots did not disperse well in the film, resulting in concentration quenching. Surface modification improved the affinity between carbon dots and the fluoropolymer, leading to a homogeneous dispersion and improved photoluminescence quantum yield.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Moeka Sasaki, Shota Hashimoto, Yoshiki Iso, Yuya Oaki, Tetsuhiko Isobe, Hiroaki Imai
Summary: This study clarified the impact of self-assembly of CsPbBr3 nanocubes (NCs) covered with DDAB on their photoluminescence (PL) properties. The PL intensity of isolated NCs was weakened in the solid state, but the PL quantum yield (PLQY) and photostability of DDAB-covered NCs were significantly improved when they formed two-dimensional (2D) ordered arrays on a substrate. The PLQY of the 2D arrays increased to approximately 60% and remained stable for over 4000 hours. These improvements are attributed to the fixation of the surface ligand around the NCs in the specific ordered arrays.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Rika Katakami, Kohei Sato, Akihiro Ogura, Ken-ichi Takao, Yoshiki Iso, Tetsuhiko Isobe
Summary: Red-emitting carbon quantum dots (CQDs) derived from 4,6-diaminoresorcinol dihydrochloride (DAR) were successfully synthesized without the use of autoclaves and catalysts. The CQDs exhibited red photoluminescence with a narrow bandwidth comparable to blue-fluorescent phloroglucinol (PG)-derived CQDs. The red emission was attributed to a weakened quantum-size effect and the presence of electron-donating NH2 groups.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
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)
