Publication date: 10th April 2014
YVO4:(Yb3+-Er3+/Ho3+) nanoparticles (NPs) were incorporated in bacterial cellulose membranes obtained from Gluconacetobacter xylinus. Materials present the property of converting near-infrared (NIR) into higher-energy visible light. NPs were prepared by optimizing towards higher emission intensity at the wavelength range of absorption of Chloroaluminum phthalocyanine (ClAlPc) used as photosensitizer in Photodynamic Therapy. The NIR excitation wavelength is advantageous for application in biological systems, as it allows deeper penetration into tissues than the UV-visible radiation commonly used for luminescence excitation. Upconversion emission spectra obtained under excitation at 980 nm showed preferential green emission for the Yb3+-Er3+ system and red emission for the Yb3+-Ho3+ one. In the last case, by using mixtures of aqueous suspensions of the nanoparticles and ethanolic solutions of ClAlPc the red emission (680nm) of the phtalocyanine was observed through excitation by the upconverted emission of the nanoparticles (650nm) which were excited in NIR (980nm).
Keywords: Upconversion, biocellulose, Chloroaluminum phthalocyanine, yttrium vanadate nanoparticles;
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.