Results 1 to 10 of about 67 (58)

Super Broadband at Telecom Wavelengths From RE3+-Doped SiO2-Ta2O5 Glass Ceramics Planar Waveguides [PDF]

Frontiers in Chemistry, 2022
This paper reports on the preparation of Er3+/Yb3+/Tm3+, Er3+/Yb3+/Nd3+, and Er3+/Tm3+/Nd3+ triply doped and Er3+-doped SiO2-Ta2O5 glass ceramic nanocomposites and active planar waveguides by the sol–gel process using the dip-coating technique as ...
Karmel De Oliveira Lima, Fábio José Caixeta, Vítor Dos Santos De Souza, Leonardo Sousa Rosa, Victor Del Vecchio Soares, Carolina Assunção Crumo, Ivana Aparecida Borin, Jefferson Luis Ferrari, Rogéria Rocha Gonçalves   +8 more
doaj   +2 more sources

Upconversion rare Earths nanomaterials applied to photodynamic therapy and bioimaging [PDF]

Frontiers in Chemistry, 2022
Light-based therapies and diagnoses including photodynamic therapy (PDT) have been used in many fields of medicine, including the treatment of non-oncological diseases and many types of cancer.
Thaís K. L. Rezende, Helliomar P. Barbosa, Luiz F. dos Santos, Karmel de O. Lima, Patrícia Alves de Matos, Tayana M. Tsubone, Rogéria R. Gonçalves, Jefferson L. Ferrari   +7 more
doaj   +2 more sources

Single Er3+, Yb3+: KGd3F10 Nanoparticles for Nanothermometry [PDF]

Frontiers in Chemistry, 2021
Among several optical non-contact thermometry methods, luminescence thermometry is the most versatile approach. Lanthanide-based luminescence nanothermometers may exploit not only downshifting, but also upconversion (UC) mechanisms.
Karmel de Oliveira Lima, Luiz Fernando dos Santos, Rodrigo Galvão, Antonio Claudio Tedesco, Leonardo de Souza Menezes, Rogéria Rocha Gonçalves   +5 more
doaj   +2 more sources

Magnetic and Highly Luminescent Heterostructures of Gd³⁺/ZnO Conjugated to GCIS/ZnS Quantum Dots for Multimodal Imaging [PDF]

Nanomaterials, 2021
In recent years, the use of quantum dots (Qdots) to obtain biological images has attracted attention due to their excellent luminescent properties and the possibility of their association with contrast agents for magnetic resonance imaging (MRI). In this
Bruna Lallo da Silva, Laurent Lemaire, Jean-Pierre Benoit, Fernanda Hediger Borges, Rogéria Rocha Gonçalves, Camila Fernanda Amantino, Fernando Lucas Primo, Leila Aparecida Chiavacci   +7 more
doaj   +2 more sources

Refractive Indexes and Spectroscopic Properties to Design Er3+-Doped SiO2–Ta2O5 Films as Multifunctional Planar Waveguide Platforms for Optical Sensors and Amplifiers [PDF]

ACS Omega, 2021
Jefferson L. Ferrari, Karmel de O. Lima, Rogéria R. Gonçalves   +2 more
doaj   +2 more sources

Estudo da decomposição térmica de oxalato de estrôncio dopado com cério(III) como precursor de materiais luminescentes

Ecletica Quimica, 2002
Este trabalho trata da obtenção de SrC2O4, Ce2(C2O4)3, e SrC2O4 dopado com diferentes porcentagens de Ce3+ como precursores do luminóforo azul Sr2CeO4. Os precursores preparados foram estudados por TG e DTA. Uma mistura contendo SrC2O4 e Ce2(C2O4)3 na relação 4:1 respectivamente e SrC2O4 dopado com diferentes porcentagens de Ce3+, foram tratadas ...
Jefferson Luis Ferrari, Ana M Pires, Marian Rosaly Davolos   +2 more
exaly   +5 more sources

Enhanced Upconversion Emission from K+‑Modified NaGdF4:Er3+/Yb3+ Particles in Flexible Free-Standing Films for Thermal Sensing Application [PDF]

ACS Omega
Ana Beatriz Acosta, Vitor dos Santos de Souza, Francisco Recco Torres, Yaman Masetto Nicolai, Luiz Fernando dos Santos, José Maurício Almeida Caiut, Rogéria Rocha Gonçalves   +6 more
doaj   +2 more sources

Highly red luminescent stabilized tetragonal rare earth-doped HfO2 crystalline ceramics prepared by sol-gel

Optical Materials: X, 2022
We report high incorporation of rare earth ions (RE3+) into hafnia nanoparticles prepared by the sol–gel method and investigate how these dopants affect hafnia structure and phase transformation.
Fernanda Hediger Borges, Douglas Silva da Hora Oliveira, Giulia Paulino Hernandes, Sidney José Lima Ribeiro, Rogéria Rocha Gonçalves   +4 more
doaj   +1 more source

Uma Contribuição do Design Emocional para o Design de Superfície: um estudo de caso da ciclovia Van Gogh-Roosegaarde

ModaPalavra e-periódico, 2018
O presente artigo aborda uma contribuição do Design Emocional para o Design de Superfície. A partir da teoria "Três Níveis de Design" proposta por Norman (2008), é conduzida uma análise da ciclovia Van Gogh-Roosegaarde, na Holanda.
Victoria de Menezes Piffero, Gabriela Zubaran de Azevedo Pizzato   +1 more
doaj   +5 more sources

Fluorescence Intensity Ratio‐based temperature sensor with single Nd3 + :Y2O3 nanoparticles: Experiment and theoretical modeling

Nano Select, 2021
A thermometer based on single Nd3 + :Y2O3 nanoparticles is reported. The nanothermometer relies on the ratio of thermally coupled Nd3 + emission lines accessible by either continuous‐wave upconversion under 880 nm or downconversion under 532 nm ...
Rodrigo Galvão, Luiz F. dos Santos, Rogéria R. Gonçalves, Leonardo de S. Menezes   +3 more
doaj   +1 more source