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Title: Sonochemical synthesis of highly luminescent Ln 2O 3:Eu 3+ (Y, La, Gd) nanocrystals

In this study, sonication of Ln(CH 3COO) 3·H 2O, Eu(CH 3COO) 3·H 2O and NaOH dissolved in the ionic liquid-butyl-3-methylimidazolium bis(trifluoromethane)sulfonylamide lead to Ln(OH) 3:Eu (Ln: Gd, La, Y) nanoparticles. Subsequent calcination at 800 °C for 3 h allowed to obtain Ln 2O 3:Eu nanopowders. Gd 2O 3 and Y 2O 3 were obtained in the C-type lanthanide sequioxide structure, whereas La 2O 3 crystallized in the A-type. Structure, morphology, and luminescent properties of the nano-oxides were investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), dispersive X-ray (EDX), and photoluminescence (PL). SEM studies revealed that the synthesized Gd 2O 3:Eu, La 2O 3:Eu, and Y 2O 3:Eu formed nano-spindle, -sheets, and -rods in shape, respectively. The nanoscale materials show very efficient red emission due to the intraconfigurational f–f transitions of Eu 3+. The quantum yields for Ln 2O 3:Eu (5%) were determined to be 4.2% for Ln=Gd, 13.8% for Ln=Y and 5.2% for Ln=La. The asymmetric ratio I 02/I 01 of Eu 3+ varies from 5.3 for Gd 2O 3, to 5.6 for Y 2O 3 to 6.5 for La 2O 3, which increased the color chromaticity.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Univ. of Wroczlaw, Wroczaw (Poland)
  3. The European Patent Office, Rijswijk (The Netherlands)
Publication Date:
OSTI Identifier:
1239158
Report Number(s):
IS-J-8884
Journal ID: ISSN 0022-2313; PII: S0022231315002513
Grant/Contract Number:
200475; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Luminescence
Additional Journal Information:
Journal Volume: 169; Journal Issue: PB; Journal ID: ISSN 0022-2313
Publisher:
Elsevier
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ceramics; inorganic compounds; nanostructures; oxides; photoluminescence spectroscopy