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Title: Photodegradation of luminescence in organic-ligand-capped Eu{sup 3+}:LaF{sub 3} nano-particles

The luminescence from europium doped lanthanum trifluoride (Eu{sup 3+}:LaF{sub 3}) nano-crystals can be greatly enhanced by capping with β-diketonate organic ligands. Here, we report on photo-stability measurements for the case of nano-crystals capped with thenoyltrifluroacetone (TTA) and compared with those capped with an inactive ligand, oleic acid. With exposure to UV pump light, we observed significant decrease in fluorescence and change in emission spectrum of the TTA-capped nano-particles whilst the fluorescence lifetime remained approximately constant. After a dose of order 70 kJ cm{sup −2}, the luminescence level was similar to that of oleic acid capped nano-crystals. We discuss possible mechanisms.
Authors:
; ;  [1] ; ;  [2]
  1. Department of Physics, University of Otago, P.O. Box 56, Dunedin 9054 (New Zealand)
  2. Callaghan Innovation Research Limited, P.O. Box 31-310, Lower Hutt 5040 (New Zealand)
Publication Date:
OSTI Identifier:
22275621
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; COMPARATIVE EVALUATIONS; CRYSTALS; DOPED MATERIALS; EMISSION SPECTRA; EUROPIUM IONS; FLUORESCENCE; LANTHANUM FLUORIDES; LIGANDS; OLEIC ACID; PARTICLES; PHASE STABILITY; TTA; VISIBLE RADIATION