Article
Materials Science, Multidisciplinary
Yuichi Hirai, Stann Van Baaren, Takahito Ohmura, Takayuki Nakanishi, Takashi Takeda, Yuichi Kitagawa, Yasuchika Hasegawa, Remi Metivier, Clemence Allain
Summary: In pursuit of new mechanically responsive luminescent materials, the study aims to differentiate triboluminescence (TL) from photoluminescence (PL). A beta-diketonate ligand with tert-butyl groups is used to quench Eu-III-centered PL and provide efficient photosensitization of Tb-III ions. Nanomechanical tests reveal the ductility of the crystals, making them ideal for accumulating deformation energy before breakage. Additionally, the study investigates the TL/PL color difference and mechanochromic luminescence (MCL) in a Tb-III/Eu-III heterodinuclear complex.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dipankar Bhowmik, Uday Maitra
Summary: Rare earth elements are crucial in various practical applications, but their availability is being hindered by several challenges. Therefore, the recycling of lanthanides from electronic and other waste is gaining traction, making the high sensitivity and selectivity detection of lanthanides a critical research area. We have now introduced a paper-based photoluminescent sensor capable of rapidly detecting terbium and europium with a low detection limit (in nanomolar range), which has the potential to facilitate recycling processes.
Article
Materials Science, Multidisciplinary
M. E. Alvarez-Ramos, J. Alvarado-Rivera, F. Felix-Dominguez, R. C. Carrillo-Torres, R. Sanchez-Zeferino, G. Saavedra-Rodriguez
Summary: A series of TeO2-GeO2-ZnO glasses doped with Tb3+ and Eu3+ in different ratios were investigated for their luminescent and colorimetric properties in lighting devices. X-ray diffraction and Raman spectroscopy confirmed the glassy nature of the fabricated samples. The doping effects were analyzed through fluorescence and time-resolved spectroscopy. Energy transfer between Tb3+ and Eu3+ ions was observed, with Tb3+ -> Eu3+ being the main interaction type, and the CIE1931 chromaticity coordinates showed multicolor tuning from green to orange-red.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Nathalia Maria Moraes Fernandes, Gustavo Barbosa-Reis, Diogo Oliveira-Silva, Izilda A. Bagatin
Summary: New lanthanide-based luminescent coordination compounds were synthesized, containing quinoline derivatives and 2-(4-hydroxyazobenzene)benzoic acid (HABA). Structural elucidation was carried out using various methods, and photoluminescence spectroscopy in the solid state was performed. The energy transfer to the metal ions through the pi-conjugated system was observed for Eu3+ and Tb3+ compounds. Europium complexes emitted red light and Terbium complexes emitted green light.
Article
Polymer Science
Anna S. Miroshnichenko, Konstantin V. Deriabin, Artem A. Rashevskii, Vitalii V. Suslonov, Alexander S. Novikov, Ivan S. Mukhin, Regina M. Islamova
Summary: Photoluminescent lanthanide complexes were synthesized and characterized. These complexes showed strong photoluminescence and could be used as emitting fillers in polymer photoluminescent materials.
Article
Optics
Stevan Stojadinovic, Aleksandar Ciric
Summary: Eu3+ and Tb3+ doped ZnO optical coatings were prepared by Plasma Electrolytic Oxidation method, with varying dopant concentrations. The samples exhibited wurtzite structure of ZnO and different emission spectra under specific excitation wavelengths. The PL chromaticity varied with concentration only when irradiated by UV light.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Applied
Xin-Yuan Sun, Min-Jun Zhou, Chang-Bin Deng, Qing-Mei Yang, Jiuping Zhong
Summary: By adjusting the composition and designing new Tb3+-activated tellurium-lutetium-tungsten glasses, significant improvements in optical properties and density have been achieved, with potential applications in the detection of slow events.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Physical
Bingjie Zhong, Chengyang Zuo, Chao Yang, Shilin Yang, Yun Li, Hongtao Yu, Xianhua Wei
Summary: Rare-earth ion Eu3+ was doped into SrTiO3 ceramic to enhance its dielectric energy storage properties and act as luminescence centres. The doped ceramic exhibited higher breakdown strength and recoverable energy density compared to the undoped sample, with improvements of about 22% and 58%, respectively. In addition, the europium-doped ceramic capacitor demonstrated excellent power density and characteristic red photoluminescence.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Marco Bortoluzzi, Andrea Di Vera, Luca Pietrobon, Jesus Castro
Summary: Diphenyl N-dimethylamidophosphate was introduced into the coordination sphere of trivalent lanthanide ions in conjunction with beta-diketonates to form seven- and eight-coordinate complexes. The Eu(III) complexes displayed bright red emission, while the Tb(III) derivative exhibited intense green photoluminescence.
JOURNAL OF COORDINATION CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Oleksandr Stroyuk, Oleksandra Raievska, Jens Hauch, Christoph J. Brabec
Summary: Tailored modifications of halide lead-free perovskites (LFPs) via doping/alloying with metal cations have shown promise in achieving highly efficient inorganic phosphors. These materials exhibit selective sensitivity to UV light, a broad PL range, long PL lifetimes, and unique compositional variability and stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Yuxiang Wang, Shengwen Zhong, Xiaoqiang Wen, Qian Zhang
Summary: Y2O2SO4 submicron spheres were prepared via solid-phase reaction, showing monoclinic phase with uniform shapes. When doped with Tb3+, the spheres exhibited strong green emission peak and could be potential green-emitting phosphors for lamps and display devices.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jae Young Kim, Yong Jin Jeong
Summary: Recently, a composite thermoelectric material consisting of conducting polymer (PEDOT:PSS) and nanostructured tellurium (Te) has been developed, which exhibits high thermoelectric performance along with mechanical flexibility. However, its vulnerability to oxidation limits its ability to harvest energy continuously in various environments. To address this issue, a Se doping strategy is proposed in this report to enhance the oxidation stability of the composite material and evaluate its characteristics and thermoelectric properties. The Se-doped nanostructured Te/PEDOT:PSS composite material demonstrates improved oxidation stability and thermoelectric properties, making it a promising candidate for future thermoelectric device applications.
Article
Chemistry, Physical
Ranran Fan, Junpeng Qiao, Jiaxin Xu, Sujuan Feng, Guangqiang Liu
Summary: In this paper, one-dimensional Cs2AgI3 and Cu+-doped Cs2AgI3 single crystals were synthesized using the antisolvent infiltration method. The Cs2AgI3 single crystals exhibited blue emission at 473 nm with a large Stokes shift, possibly due to self-trapped excitons (STEs). Experimental studies showed that appropriate Cu+ dopant significantly enhanced the photoluminescence quantum yield (PLQY) of Cs2AgI3. Theoretical calculations confirmed that optimized Cu+ concentration effectively modulated the electronic band structure and highlighted strong localized characteristic electronic states in the CuI4 tetrahedron, which improved the luminescence efficiency of the blue band. Additionally, these metal halides demonstrated strong stability in air ambient. This work provides a feasible strategy to enhance optoelectronic performance through extrinsic chemical doping and promotes the commercial application of lead-free metal halides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Naseem Fatima, K. N. Sathish, A. G. Pramod, Vinod Hegde, Mahesh M. Hivrekar, K. Keshavamurthy, B. N. Swetha, P. Ramesh, Badriah Albarzan, Aljawhara H. Almuqrin, M. Sayyed, Y. F. Nadaf, G. Jagannath
Summary: The study investigated the effect of silver nanoparticles on the photoluminescence properties of optimized Eu2O3 doped borate glasses. It was found that the photoluminescence intensity of Eu3+ transitions improved up to 0.6 mol% of AgNO3, but subsequent quenched at 0.8 mol%. The enhancement was attributed to local field effect and energy transfer, while the reduction was due to reverse energy transfer.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
M. Dutta, J. M. Kalita, G. Wary
Summary: The optical absorption and emission features of Eu doped Y2O3 nanoparticles synthesized by a gradually-heated solution combustion method were investigated in this study. The samples exhibited an increase in crystallite size and optical band gap after doping with Eu. The primary emission band was composed of two overlapping components attributed to the transition from degenerate 5d -> 4f level of Eu2+ ion.
Article
Optics
Luiz M. M. Barreto, Davinson M. da Silva, Antonio D. Santos, Koiti Araki, Cid B. de Araujo, Luciana R. P. Kassab
Summary: Multilayer graphene (MLG) thin films were produced by depositing them on a cobalt buffer-layer prepared at 500 degrees C and subsequently thermal annealing. The annealing process allowed the transformation of amorphous carbon to graphene through diffusion and nucleation. The thicknesses of the cobalt and MLG thin films were measured as 55 and 54 nm, respectively, by atomic force microscopy. Raman spectroscopy confirmed the presence of MLG based on the intensity ratio of the 2D and G bands (I2D/IG), which was found to be 0.4 for the annealed graphene thin film. Additional analysis using transmission electron microscopy supported the Raman results. Moreover, the MLG films exhibited significant nonlinear absorption behavior at 980 nm and can be utilized as optical limiters.
Article
Optics
Josivanir G. Camara, Davinson M. Da Silva, Luciana R. P. Kassab, Cid B. De Araujo
Summary: Random lasing is observed in neodymium doped alumina lead-germanate glass powder for the first time. The samples were fabricated using a conventional melt-quenching technique and confirmed to have an amorphous structure. Excitation of the sample at 808 nm resulted in random laser emission at 1060 nm, with an excitation energy fluence threshold of 0.3 mJ/mm2. The use of large quantities of neodymium oxide in the glass did not hinder the laser emission process, despite luminescence concentration quenching.
Article
Chemistry, Multidisciplinary
Augusto Anselmo Amaro, Guilherme Rodrigues da Silva Mattos, Marcos Vinicius de Morais Nishimura, Jessica Dipold, Niklaus Ursus Wetter, Luciana Reyes Pires Kassab
Summary: This study investigates the optical properties of GeO2-PbO glasses doped with Yb3+ ions and Ag nanoclusters (NCs) produced through the melt-quenching technique. The lack of research on the energy transfer between these species in these glasses motivated this study. Tunable visible emission, ranging from blue to orange, was observed depending on the Yb3+ concentration, which affects the size of the Ag NCs. The transfer of energy from Ag NCs to Yb3+ ions was attributed to a decay mechanism and was supported by changes in lifetimes and photoluminescence measurements.
Article
Chemistry, Physical
Maxwell A. M. Nogueira, Albert S. Reyna, Helivaldo D. S. Souza, Bruno F. Lira, Petronio F. de Athayde-Filho, Cid B. B. de Araujo
Summary: We synthesized a mesoionic compound and investigated its nonlinear optical response in terms of refractive and absorptive properties in different temporal and spectral regimes. Z-scan technique was used with two pulsed light sources: a mode-locked and Q-switched Nd-YAG laser at 532 nm and a Ti: Sapphire laser system at 800 nm. The compound's nonlinear refraction, two- and three-photon absorption, and excited state absorption were observed and characterized based on a three-energy-level model, allowing the determination of the parameters that describe the nonlinear response.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Materials Science, Multidisciplinary
Luz Patricia Naranjo-Riano, Nathalia T. C. Oliveria, Camilo E. Echeverry, Luciana R. P. Kassab, Cid B. de Araujo
Summary: We synthesized and characterized PbO-Bi2O3-Ga2O3 glass-ceramics containing PbO and Bi2O3 crystallites, free Pb2+ and Bi3+ ions, and Ag-NPs. The samples were prepared using the melt-quenching method followed by heat treatment. Various techniques were used for characterization, including transmission electron microscopy, X-ray diffraction, linear optical absorption, and photoluminescence (PL). Excitation at 330 nm resulted in a large PL intensity due to Pb2+ and Bi3+. Additionally, the PL intensity was enhanced by about 1000% in samples containing Ag-NPs compared to those without Ag-NPs. This behavior is reported for the first time in heavy-metal oxide glass-ceramics, highlighting the potential for photonic applications.
Article
Optics
Andre C. A. Siqueira, Guillermo Palacios, Albert S. Reyna, Boris A. Malomed, Edilson L. Falcao-Filho, Cid B. de Araujo
Summary: We present the results of a numerical analysis comparing the efficiency of the multiple temporal compression (MTC) method with conventional methods using photonic crystal fibers (PCFs) and fused silica waveguides (FSWs) for generating multiple solitons. The analysis shows that the MTC method is more efficient in controlling soliton fission, resulting in a larger number of high-powered fundamental solitons that remain stable over long distances. The high efficiency of the MTC method is particularly evident in multiple soliton collisions and the Newton's-cradle phenomenology.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Guillermo Palacios, Andre C. A. Siqueira, Cid B. de Araujo, Anderson S. L. Gomes, Ernesto P. Raposo
Summary: In this study, the phenomenon of replica symmetry breaking (RSB) was investigated in random lasers (RLs) through Monte Carlo simulations. The study revealed that photonic random walkers diffuse and get randomly scattered in the active medium, interacting with both the population of excited atoms and each other. When the interactions among photonic walkers are not included, a replica-symmetric distribution for the Parisi overlap parameter (P(q)) at q = 0 is found for any excitation energy. The study also examined the statistical correlations of intensity fluctuations in different modes of the same spectrum, finding consistency with experimental results in RL materials.
Article
Nanoscience & Nanotechnology
Jessica E. Q. Bautista, Cecilia L. A. V. Campos, Manoel L. da Silva-Neto, Cid B. de Araujo, Ali M. Jawaid, Robert Busch, Richard A. Vaia, Anderson S. L. Gomes
Summary: We experimentally studied spatial self-phase modulation (SSPM) in liquid suspensions of various 2D materials. The intensity-dependent changes in refractive index responsible for SSPM are shown to be due to thermal effects. The measured thermal nonlinear coefficients for different suspensions are independent of the excitation regime. The use of circularly polarized light complements the results obtained with linearly polarized light.
Article
Chemistry, Physical
Manoel L. Silva-Neto, Renato Barbosa-Silva, Georges Boudebs, Cid B. de Araujo
Summary: This study determined the first hyperpolarizability of graphene quantum dots (GQDs) suspended in water using the hyper-Rayleigh scattering (HRS) technique. The results suggest that these GQDs may have potential applications in biological microscopy imaging.
Article
Chemistry, Analytical
Marcos Vinicius de Morais Nishimura, Augusto Anselmo Amaro, Camila Dias da Silva Bordon, Jessica Dipold, Niklaus Ursus Wetter, Luciana Reyes Pires Kassab
Summary: This study introduces a novel method for producing Ag nanoclusters within GeO2-PbO glasses doped with Tm3+ ions. The research confirms the formation of Ag nanoclusters and their amorphous structure through transmission electron microscopy. The energy transfer mechanism between Ag nanoclusters and Tm3+ ions is demonstrated.
Article
Materials Science, Multidisciplinary
Renato Barbosa-Silva, Mario S. S. Oliveira, Rudson C. Ferreira, Vinicius Manzoni, Eduardo H. L. Falcao, Cid B. de Araujo
Summary: Measurements and theoretical modeling of the second-order optical nonlinearity of two 1,3,4-oxadiazole derivatives, Oxa-4-Py and DiOxaBn-2-Tio, were reported. The dynamic and static first hyperpolarizability values were measured using the hyper-Rayleigh scattering technique and a density functional method. The results showed that the first hyperpolarizability of DiOxaBn-2-Tio is approximately 30% larger than that of Oxa-4-Py.
Article
Optics
Andre C. A. Siqueira, Edilson L. Falcao-Filho, Boris A. Malomed, Cid B. de Araujo
Summary: Theoretical consideration and numerical simulation of femtosecond pulse propagation in a one-dimensional composite medium reveals the generation of bright soliton trains. The paper discusses the controllable production of ultrashort temporal solitons and addresses the role of intrapulse Raman scattering and collisions between solitons with different central wavelengths.
Proceedings Paper
Engineering, Electrical & Electronic
Jessica Dipold, Camila D. S. Bordon, Evellyn S. Magalhaes, Luciana R. P. Kassab, Ernesto Jimenez-Villar, Niklaus U. Wetter
Summary: Random lasers, made of various materials, are easier and cheaper to manufacture than regular lasers. Glass random lasers have been rarely studied due to their unique properties. In this study, Nd(3+)-doped TeO2-ZnO-Al2O3 glasses with different concentrations of rare-earth doping were investigated, showing potential for random laser applications in the near-infrared region.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
