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Title: Influence of grain size on optical properties of Sr{sub 2}CeO{sub 4} nanocrystals

The absorption, excitation, and emission spectra of the Sr{sub 2}CeO{sub 4} nanocrystals prepared by the modified sol–gel method were investigated. The impact of the average grain size of Sr{sub 2}CeO{sub 4} nanocrystals on their optical properties was investigated. It was observed that with increasing the average grain size of Sr{sub 2}CeO{sub 4} nanocrystals, the emission decay times decreased significantly. A similar behavior was observed for the emission quantum efficiencies and the Huang–Rhys factors. The grain size dependence of optical parameters of Sr{sub 2}CeO{sub 4} nanocrystals was found well fitted by functions of the reciprocal of the grain diameter. It was shown that this dependence may be rationalized assuming that the correction for electric local field associated with effective refractive index affecting the spherical nanoparticle is governed by its shell.
Authors:
; ; ;  [1]
  1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50–422 Wroclaw (Poland)
Publication Date:
OSTI Identifier:
22415775
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTRA; CORRECTIONS; CRYSTALS; EMISSION SPECTRA; EXCITATION; GERMANATES; GRAIN SIZE; NANOPARTICLES; NANOSTRUCTURES; QUANTUM EFFICIENCY; REFRACTIVE INDEX; SOL-GEL PROCESS; SPHERICAL CONFIGURATION; STRONTIUM COMPOUNDS