Document Detail


Temperature and pressure dependence of the optical properties of Cr(3 + )-doped Gd(3)Ga(5)O(12) nanoparticles.
MedLine Citation:
PMID:  21576777     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Since the crystal-field strength at the Cr(3 + ) site is very close to the excited-state crossover (ESCO), this work investigates the optical properties of Cr(3 + )-doped Gd(3)Ga(5)O(12) (GGG) nanoparticles as a function of temperature and pressure in order to establish the effect of the ESCO on the optical behaviour of nanocrystalline GGG. Luminescence, time-resolved emission and lifetime measurements have been performed on GGG:0.5% Cr(3 + ) nanoparticles in the 25-300 K temperature range, as well as under hydrostatic pressure up to 20 GPa. We show how low temperature and high pressure progressively transforms [Formula: see text] broadband emission into a ruby-like [Formula: see text] luminescence. This behaviour together with the lifetime dependence on pressure and temperature are explained on the basis of the spin-orbit interaction between the (4)T(2) and (2)E states of Cr(3 + ).
Authors:
R Martín-Rodríguez; R Valiente; F Rodríguez; M Bettinelli
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Publication Detail:
Type:  Journal Article     Date:  2011-05-17
Journal Detail:
Title:  Nanotechnology     Volume:  22     ISSN:  1361-6528     ISO Abbreviation:  Nanotechnology     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-05-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101241272     Medline TA:  Nanotechnology     Country:  England    
Other Details:
Languages:  eng     Pagination:  265707     Citation Subset:  IM    
Affiliation:
MALTA Consolider Team, Departamento Física Aplicada, Facultad de Ciencias, Universidad de Cantabria, Avenida de Los Castros s/n, 39005 Santander, Spain. Instituto de Condiciones Extremas (Centro Asociado CSIC ICMA Zaragoza), Santander, Spain.
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