Search results for "Upconversion"
showing 4 items of 54 documents
Cucurbit[n]uril-capped upconversion nanoparticles as highly emissive scaffolds for energy acceptors.
2015
Spontaneous adsorption of cucurbit[n]uril CB[n] (n = 6, 7, and 8) on the surface of naked upconversion nanoparticles (UCNPs), in particular, NaYF4:Er3+(2%),Yb3+(18%) gave rise to UCNP@CB[n] exclusion complexes. These complexes proved to be highly stable as well as highly emissive under near-infrared excitation. By using two tricyclic basic dyes (specifically, methylene blue and pyronin Y) as a proof of concept, we demonstrate that the UCNP@CB[n] (n = 6, 7) nanohybrids can form exclusion complexes with this type of dyes via the CB carbonyl free portal, i.e., UCNP@CB@dye hybrids, thus making it possible to locate a high concentration of the dyes close to the UCNP and, consequently, leading to…
Energy transfer in diiodoBodipy-grafted upconversion nanohybrids.
2015
Steady-state and time-resolved emission studies on nanohybrids consisting of NaYF4:Yb,Er and a diiodo-substituted Bodipy (UCNP-IBDP) show that the Yb(3+) metastable state, formed after absorption of a near-infrared (NIR) photon, can decay via two competitive energy transfer processes: sensitization of IBDP after absorption of a second NIR photon and population of Er(3+) excited states.
A new forum for upconversion research: The UPCON conference
2019
International audience; The Conference and Spring School on Properties, Design and Applications of Upconversion Nanomaterials (UPCON) provides a new forum for all experts and newcomers in the field of upconversion research. On the occasion of the second UPCON 2018 in Valencia (Spain), we are pleased to present a collection of 12 reviews and research articles that reflect recent advances in upconversion materials, their unique luminescent properties and many applications spanning from nanoscale thermometry to biomedicine.
Nanopartículas de upconversion: síntesis y aplicaciones
2017
En las últimas décadas la nanoquímica ha alcanzado gran interés debido a la importancia de desarrollar materiales únicos e innovadores en la escala nanométrica, específicamente nanopartículas. Las propiedades de los nanomateriales son diferentes de las de los respectivos materiales a gran escala, así la nanoquímica abre caminos innovadores en la ciencia para desarrollar materiales con nuevas propiedades y comportamientos novedosos. Las nanopartículas de upconversion (UCNP) están compuestas por nanocristales inorgánicos que contienen lantánidos, como NaYF4 codopados con cationes lantánidos (como Er3+, Yb3+, Tm3+…). Las UCNP tienen una excelente estabilidad química, térmica y lumínica, buena …