Down- and up-conversion photoluminescence, cathodoluminescence and paramagnetic properties of NaGdF4 : Yb3+,Er3+ submicron disks assembled from primary nanocrystals
- 12 March 2010
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 20 (16), 3178-3185
- https://doi.org/10.1039/b924448d
Abstract
NaGdF4 : Yb3 + ,Er3+ submicron disks have been synthesized at a relatively low temperature in aqueous solution with citric acid as the structure-directing agent. The structure, luminescence, and magnetic properties of the synthesized materials have been characterized by a variety of techniques. The as-prepared NaGdF4 : Yb3 + ,Er3+ has hexagonal structure, and is mainly composed of submicron disks with a diameter of around 870 nm and a thickness of about 420 nm. Citrate groups selectively bonded to a certain crystal surface of the nanocrystals probably provide the driving force that makes primary particles assemble into submicron disks. The phase structure of these submicron disks is affected by the annealing temperature, while the disk morphology could be essentially preserved even when annealed at high temperatures. The annealed submicron disks exhibit prominent visible emission with different excitation sources, including ultraviolet light, low-voltage electron beam and near-infrared laser. In addition, these disks exhibit paramagnetic features with the mass magnetic susceptibility value of 9.82 × 10−5 emu/g·Oe at room temperature. These multifunctional disks would have potential in applications as building blocks for many functional devices such as solid-state lasers, lighting and displays, magnetic resonance imaging and so on.This publication has 58 references indexed in Scilit:
- Controllable synthesis and formation mechanism of luminescent monodispersed NaEuF4submicron disks through assembled nanocrystalsCrystEngComm, 2009
- Combined Optical and MR Bioimaging Using Rare Earth Ion Doped NaYF4 NanocrystalsAdvanced Functional Materials, 2009
- Lanthanide‐Containing Light‐Emitting Organic–Inorganic Hybrids: A Bet on the FutureAdvanced Materials, 2009
- Highly efficient low-voltage cathodoluminescence of LaF3:Ln3+ (Ln=Eu3+,Ce3+,Tb3+) spherical particlesApplied Physics Letters, 2008
- High-resolution luminescence spectroscopy study of down-conversion routes in and using synchrotron radiationPhysical Review B, 2008
- Multicolour PEI/NaGdF4:Ce3+,Ln3+nanocrystals by single-wavelength excitationNanotechnology, 2006
- Water-Soluble GdF3 and GdF3/LaF3 NanoparticlesPhysical Characterization and NMR Relaxation PropertiesChemistry of Materials, 2006
- Bright White Light through Up-Conversion of a Single NIR Source from Sol−Gel-Derived Thin Film Made with Ln3+-Doped LaF3 NanoparticlesJournal of the American Chemical Society, 2005
- General and Convenient Method for Making Highly Luminescent Sol−Gel Derived Silica and Alumina Films by Using LaF3 Nanoparticles Doped with Lanthanide Ions (Er3+, Nd3+, and Ho3+)Chemistry of Materials, 2005
- Synthesis, Characterization, and Biological Application of Size-Controlled Nanocrystalline NaYF4:Yb,Er Infrared-to-Visible Up-Conversion PhosphorsNano Letters, 2004