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Spectroscopic studies of solvothermally derived LaF3:Nd nanocrystals.
MedLine Citation:
PMID:  19205240     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
LaF3:Nd (0.5-10.7 mol%) nanocrystals were solvothermally synthesized and their optical properties were studied. Judd-Ofelt parameterization of the absorption spectra gave a radiative decay time of 846 micros for the 4F3/2 excited state to the four emission channels. Measured fluorescence decay curves for 5 different Nd3+ concentrations were fit with double exponential functions. The decrease in fluorescence decay time shows that concentration quenching is appreciable as the Nd3+ concentration increases. The 0.5 mol% Nd3+ concentration shows a decay time of 800 micros and a radiative quantum efficiency of 95%. For all dopant concentrations, heat-treatment (800 degrees C, 2 h) substantially increased the emission intensity by 2 to 3-orders of magnitude. This emission intensity increase is attributed to reduction in hydroxyls and homogenization of the Nd3+ coordination environment through improved crystalline perfection of the LaF3:Nd lattice.
Authors:
G A Kumar; C W Chen; R E Riman
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of nanoscience and nanotechnology     Volume:  8     ISSN:  1533-4880     ISO Abbreviation:  J Nanosci Nanotechnol     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2009-02-11     Completed Date:  2009-03-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088195     Medline TA:  J Nanosci Nanotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6558-63     Citation Subset:  -    
Affiliation:
Department of Material Science and Engineering, Rutgers - The State University of New Jersey, Piscataway 08854-8065, New Jersey, USA.
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