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Title: Luminescence properties of LaF{sub 3}:Ce nanoparticles encapsulated by oleic acid

Highlights: • In-situ hydrophobization of water dispersible LaF{sub 3}:Ce nanoparticles was achieved. • Oleic acid surface modification of the nanoparticles was verified by IR spectra. • Quantum yields of LaF{sub 3}:Ce and OA-LaF{sub 3}:Ce nanoparticles were evaluated. • Quantum yields of LaF{sub 3}:Ce are strongly dependent on OA surface modification. - Abstract: Cerium ions doped lanthanum fluoride (LaF{sub 3}:Ce) nanopowder as well as LaF{sub 3}:Ce nanopowder whose surfaces was modified by oleic acid (OA) were synthesized by using an in-situ hydrothermal process under the various doping concentrations. Based on the XRD spectra and TEM images, it was confirmed that the crystalline structured hexagonal LaF{sub 3}:Ce nanopowder was synthesized. Oleic acid was efficient for conversion of the water dispersible LaF{sub 3}:Ce nanoparticles to hydrophobic ones. Surface modification was verified by FTIR absorption spectrum as well as TEM images, showing no agglomeration between 5 and 10 nm scaled particles. Photoluminescence based on 5d ⟶ 4f electronic transition of cerium ions excited at λ{sub ex} ∼256 nm for both neat and OA encapsulated LaF{sub 3}:Ce nanoparticles decreases as the cerium concentration increases, while the quantum yields of OA encapsulated nanoparticles were much lower than the neat particles due to low photon transmittance ofmore » OA at the range longer than ∼350 nm.« less
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ; ;  [4] ;  [2] ;  [5] ;  [6]
  1. Nuclear Materials Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon-si 303-353 (Korea, Republic of)
  2. (Korea, Republic of)
  3. (United States)
  4. WCI Quantum Beam-based Radiation Research Center, Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon-si 303-353 (Korea, Republic of)
  5. Department of Nano Science and Technology, Sejong University, 98 Gunja-dong, Gwangjin-gu 143-747 (Korea, Republic of)
  6. Missouri University Research Reactor, University of Missouri, Columbia, MO 65211 (United States)
Publication Date:
OSTI Identifier:
22420551
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 57; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; AGGLOMERATION; CERIUM; CERIUM IONS; CONCENTRATION RATIO; DOPED MATERIALS; FOURIER TRANSFORMATION; INFRARED SPECTRA; LANTHANUM FLUORIDES; NANOPARTICLES; NANOSTRUCTURES; OLEIC ACID; PHOTOLUMINESCENCE; POWDERS; SURFACES; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION