Controlled shape growth of Eu- or Tb-doped luminescent Gd2O3 colloidal nanocrystals

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

“…The permanent dipoles of water are induced in solution and can produce a rapid heating of the system because they interact directly with microwaves. This kind of interaction is directly related to the water capacity for electromagnetic radiation absorption and efficiency in converting electromagnetic radiation to thermal energy [25][26][27][28] . Therefore, the reaction time and temperature necessary for obtaining of such materials in this work is significantly lower than those described in the literature [29][30][31][32] providing a significant improvement on crystallinity and morphology.…”

Glycine–Nitrate Process for the Elaboration of Eu3+‐Doped Gd2O3 Bimodal Nanoparticles for Biomedical Applications

“…[61] (3) A lot of weak peaks in the higher-wavelength region (350-500 nm) correspond to direct 4fǞ4f Eu 3+ absorption lines, and the resulting emission is much less intense than that of the CTB. [66,67] In these excitation spectra, the broad UV band systematically increases in intensity and exhibits a redshift of the wavelength from 248 to 263 nm when the concentration of Eu 3+ ions increases from 2.5 to 20 %. This redshift is linked to the larger increase of the charge-transfer part of this excitation band relative to the host excitation part below 210 nm (increase of the number of Eu-O bonds as compared to the almost constant Gd-O bonds with europium concentration).…”

Structural studies and luminescence properties of CeO2:Eu3+ nanophosphors synthesized by oxalate precursor method

“…Rare earth ion activated nanophosphors gained great attention due to their unique optical, magnetic and electronic properties arise from their 4f electronic configuration. Rare earth ions are ideal luminescent activators in a variety of host lattices on account of their host independent, sharp 4f-4f transitions and their ability to produce strong emissions with distinctive colors due to their intra configurational transitions (Chen et al 2011;Seo et al 2009;Jose et al 2007). But the 4f-4f absorption transitions are parity forbidden and hence it cannot be efficiently excited by the UV LED chips.…”