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

Journal Article · Mon Sep 15 00:00:00 EDT 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.05.018· OSTI ID:22420551

Kim, Jaewoo ^[1]; Lee, Jun-Hyung; An, Hyejin ^[1]; Lee, Jungkuk; Park, Seong-Hee ^[2]; Seo, Young-Soo ^[3]; Miller, William H. ^[4]

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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. 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)
3. Department of Nano Science and Technology, Sejong University, 98 Gunja-dong, Gwangjin-gu 143-747 (Korea, Republic of)
4. Missouri University Research Reactor, University of Missouri, Columbia, MO 65211 (United States)

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 of OA at the range longer than ∼350 nm.

• OSTI ID: 22420551
• Journal Information: Materials Research Bulletin, Vol. 57; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

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