Listar por tema "photoluminescence"

Mostrando ítems 1-20 de 21

    • openAccess   An experimental and theoretical investigation on the optical and photocatalytic properties of ZnS nanoparticles 

      La Porta, Felipe A.; Nogueira, A. E.; Gracia, Lourdes; Pereira, W. S.; Botelho, Gleice; Mulinari, Tatiana A.; Andres, Juan; Longo, Elson Elsevier (2017-04)
      From the viewpoints of materials chemistry and physical chemistry, crystal structure directly determines the electronic structure and furthermore their optical and photocatalytic properties. Zinc sulfide (ZnS) nanoparticles ...

    • openAccess   CdSe/CdS/CdTe Core/Barrier/Crown Nanoplatelets: Synthesis, Optoelectronic Properties, and Multiphoton Fluorescence Upconversion 

      Khan, Ali Hossain; Bertrand, Guillaume H. V.; Teitelboim, Ayelet; M, Chandra Sekhar; Polovitsyn, Anatolii; Brescia, Rosaria; Planelles, Josep; Climente, Juan I.; Oron, Dan; Moreels, Iwan American Chemical Society (2020-04-10)
      Colloidal two-dimensional (2D) nanoplatelet heterostructures are particularly interesting as they combine strong confinement of excitons in 2D materials with a wide range of possible semiconductor junctions due to a ...

    • closedAccess   Characterization of amine stabilized CdSe/ZnS core–shell quantum dots by using triarylpyrylium dyes 

      Beltrán Beltrán, Alicia; Burguete, M. Isabel; Luis, Santiago V.; Galindo, Francisco Royal Society of Chemistry (2016-06-13)
      A new method to study the stabilizing primary amine ligands coordinated to the surface of CdSe/ZnS core–shell quantum dots has been developed. The method is based on the reactivity of fluorescent 2,4,6-triarylpyrylium dyes ...

    • closedAccess   Chloride-Induced Thickness Control in CdSe Nanoplatelets 

      Christodoulou, Sotirios; Climente, Juan I.; Planelles, Josep; Brescia, Rosaria; Prato, Mirko; Martín García, Beatriz; Khan, Ali Hossain; Moreels, Iwan ACS Publications (2018)
      Current colloidal synthesis methods for CdSe nanoplatelets (NPLs) routinely yield samples that emit, in discrete steps, from 460 to 550 nm. A significant challenge lies with obtaining thicker NPLs, to further widen the ...

    • openAccess   Crystalline-Size Dependence of Dual Emission Peak on Hybrid Organic Lead-Iodide Perovskite Films at Low Temperatures 

      Chulia-Jordan, Raquel; Mas, Elena; Segura, Alfredo; Bisquert, Juan; Martínez-Pastor, Juan P. American Chemical Society (2018-09)
      In this work, we have investigated the crystalline-size dependence of optical absorption and photoluminescence emission of CH3NH3PbI3 films, which is necessary to identify the potential practical applications of the gadgets ...

    • openAccess   Directional and Polarized Lasing Action on Pb-free FASnI3 Integrated in Flexible Optical Waveguide 

      Suárez, Isaac; Chirvony, Vladimir; Sanchez-Diaz, Jesus; S. Sánchez, Rafael; Mora-Sero, Ivan; Martínez-Pastor, Juan P. (2022)
      In this work, high-quality FASnI3 (FA, formamidinium) lead-free perovskite thin films are successfully incorporated in a flexible polyethylene terephthalate (PET) substrate to demonstrate amplified spontaneous emission ...

    • closedAccess   Energy transfer versus charge separation in hybrid systems of semiconductor quantum dots and Ru-dyes as potential co-sensitizers of TiO2-based solar cells. 

      Bisquert, Juan; Mora-Sero, Ivan; Gimenez, Sixto; Rogach, A. L.; Lutich, Andrey A.; Gross, Dieter; Poeschl, Andreas; Susha, A. S.; Lana-Villarreal, Teresa © 2011 American Institute of Physics (2011-07)
      Hybrid structures of colloidal quantum dots (QDs) with Ru-dyes have been studied as candidates for panchromatic sensitizers for TiO2-based solar cells. Steady-state and time resolved photoluminescence spectroscopy and ...

    • openAccess   Experimental and theoretical study of the energetic, morphological, and photoluminescence properties of CaZrO3:Eu3+ 

      Carvalho de Oliveira, Marisa; Ribeiro, Renan; Gracia, Lourdes; de Lazaro, Sergio Ricardo; Assis, Marcelo de; Oliva, Mónica; Rosa, Ieda; Do Carmo Gurgel, Maria Fernanda; Longo, Elson; Andres, Juan Royal Society of Chemistry (2018)
      In this study, we present a combined experimental and theoretical study of the geometry, electronic structure, morphology, and photoluminescence properties of CaZrO3:Eu3+ materials. The polymeric precursor method was ...

    • closedAccess   Mechanism of Antibacterial Activity via Morphology Change of α-AgVO3: Theoretical and Experimental Insights 

      Oliveira, Regiane; Foggi, Camila Cristina; Teixeira, Mayara Mondego; Penha da Silva, Maya Dayana; Assis, Marcelo de; Francisco, Eric Mark; Alves da Silva Pimentel, Bruna Natalia; Pereira, Paula; Vergani, Carlos; Machado Maciel, Ana Lúcia; Andres, Juan; Gracia, Lourdes; Longo, Elson American Chemical Society (2017)
      The electronic configuration, morphology, optical features, and antibacterial activity of metastable α-AgVO3 crystals have been discussed by a conciliation and association of the results acquired by experimental procedures ...

    • closedAccess   Photoluminescence of Ca10V6O25:Eu3+: A theoretical and experimental approach 

      Teixeira, Mayara Mondego; Pinatti, Ivo M; Laranjeira, José; da Silva Lopes Fabris, Guilherme; Daldin Teodoro, Marcio; Ieda L. V., Rosa; Simões, Alexandre; Andres, Juan; Sambrano, Julio; Longo, Elson Elsevier (2024-01-30)
      Ca10−xV6O25:xEu (x = 0%, 0.5%, 1%, 2%, 4%, and 8%) samples were synthesized by the microwave-assisted hydrothermal method at low temperature and short time. The corresponding structures were investigated by X-ray diffraction ...

    • openAccess   Photoluminescence Properties of Nanocrystals 

      Cavalcante, Laécio Santos; Sczancoski, Júlio César; Varela, José A.; Longo, Elson; Andres, Juan; Rout, S. K. Hindawi Publishing Corporation (2012)
      Photoluminescence (PL) is an optical phenomenon exhibited by some semiconductor materials when excited by an electromagnetic radiation source. After the excitation and recombination processes, these kinds of materials are ...

    • closedAccess   Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation. 

      Beltran, Armando; Andres, Juan; Gracia, Lourdes; Longo, V. M.; Cavalcante, Laécio Santos; Avansi, Waldir; Li, Maximo Siu; Mastelaro, Valmor Roberto; Varela, José A.; Longo, Elson © American Institute of Physics (2011-08)
      By combining experimental techniques such as x-ray diffraction, Fourier transform Raman, ultraviolet-visible, x-ray absorption near edge structure, extended x-ray absorption fine structure spectroscopy, and theoretical ...

    • closedAccess   Structural properties and self-activated photoluminescence emissions in hydroxyapatite with distinct particle shapes 

      Machado, Thales Rafael; Sczancoski, Júlio César; Beltrán Mir, Héctor; Siu Li, Maximo; Andres, Juan; Cordoncillo, Eloisa; Leite, Edson R.; Longo, Elson Elsevier (2018-01)
      The understanding on defect-related photoluminescence (PL) properties of hydroxyapatite (HA) particles has a fundamental importance in the technological field for the development of new non-toxic biomedical and optical ...

    • openAccess   Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag2SeO3: A Joint Experimental and Theoretical Investigation 

      Pinatti, Ivo M; Barrios Trench, Aline; Mora Tello, Ana Cristina; Pereira, Paula; Souza, Josiane C.; Teodoro, Marcio D.; Rosa, Ieda; Andres, Juan; Longo, Elson; Simoes, Alexandre Z. American Chemical Society (2021-04-19)
      In this paper, we report the synthesis of silver selenite (Ag2SeO3) by different methods [sonochemistry, ultrasonic probe, coprecipitation, and microwave-assisted hydrothermal methods]. These microcrystals presented a ...

    • openAccess   Synthesis of Air-Stable CdSe/ZnS Core–Shell Nanoplatelets with Tunable Emission Wavelength 

      Polovitsyn, Anatolii; Dang, Zhiya; Movilla, Jose L.; Martín García, Beatriz; Khan, Ali Hossain; Bertrand, Guillaume H. V.; Brescia, Rosaria; Moreels, Iwan American Chemical Society (2017)
      In the past few years, several protocols have been reported on the synthesis of CdSe nanoplatelets with narrow photoluminescence (PL) spectrum, high PL quantum efficiency, and short exciton lifetime. The corresponding ...

    • closedAccess   Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission 

      Polovitsyn, Anatolii; Khan, Ali Hossain; Angeloni, Ilaria; Grim, Joel Q.; Planelles, Josep; Climente, Juan I. American Chemical Society (2018)
      Anisotropic single-phase wurtzite CdSe/CdS nanocrystals were synthesized by colloidal chemistry, introducing ZnCl2 to increase the shell growth in the radial direction. As a result, dot-in-giant-rod nanocrystals were ...

    • openAccess   Tailoring Bi2MoO6 by Eu3+ incorporation for enhanced photoluminescence emissions 

      Pinatti, Ivo M; Pires, Fabio; Almeida, Priscila B.; Pereira, Paula; Daldin Teodoro, Marcio; Guillamón, Eva; Simões, Alexandre; Andres, Juan; Longo, Elson; Rosa, Ieda Elsevier (2021-12-13)
      Here, an experimental study is presented on the structural, electronic, and optical properties of Bi2-xMoO6:xEu3+ (x = 0, 0.5, 1.0, 2.0, and 4.0 mol%) materials, synthesized by means of the microwave-assisted solvothermal ...

    • closedAccess   Theory of Light-Modulated Emission Spectroscopy 

      Ansari-Rad, Mehdi; Bisquert, Juan American Chemical Society (2017-07)
      Perovskite solar cells and fluorescent collectors formed by a dispersion of quantum dots in a transparent solid are paradigmatic devices for photon capture and utilization that involve the coupling of photon displacement, ...

    • closedAccess   α- and β-AgVO3 polymorphs as photoluminescent materials: An example of temperature-driven synthesis 

      Oliveira, Regiane; Teixeira, Mayara Mondego; Costa, João Paulo C.; Penha, Maya; Francisco, Eric Mark; da Silva, Jussara Soares; Li, Maximo Siu; Longo, Elson; Gracia, Lourdes; Andres, Juan Elsevier (2018-04-15)
      Controlling the synthesis of a given polymorph of an inorganic material is a further step in the design of property and function. In this letter, we report for the first time a simple procedure to effectively control the ...

    • openAccess   αsingle bondAg2WO4 under microwave, electron beam and femtosecond laser irradiations: Unveiling the relationship between morphology and photoluminescence emissions 

      Teixeira, Mayara Mondego; Santos, Lílian Cruz; Mora Tello, Ana Cristina; Almeida, Priscila Barros; Soares da Silva, Jussara; Laier, Letícia; Gracia, Lourdes; Daldin Teodoro, Marcio; da Silva, Luís Fernando; Andres, Juan; Longo, Elson Elsevier (2022-01-29)
      In this study, the α-Ag2WO4 samples were successfully synthesized combined two methods, co-precipitation and microwave-assisted hydrothermal. Later, two different irradiation processes: electron beam and femtosecond laser ...