Photoluminescence of lanthanide NASICONs: Na(5)LnSi(4)O(12), Ln = Eu, Tb
authors dos Santos, AM; Marques, FMB; Carlos, LD; Rocha, J
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY
keywords SUPERIONIC CONDUCTOR; IONIC-CONDUCTIVITY; CRYSTAL-STRUCTURES; NA5YSI4O12
abstract Electrical materials incorporating lanthanide ions have great potential as electro-optical multifunctional systems. Polycrystalline NASICON ( sodium silicon conductor) fast-ion conductors (Na(5)LnSi(4)O(12), Ln = Eu, Tb) have been prepared via solid-state synthesis. These materials have been characterized by photoluminescence spectroscopy, including steady-state emission and excitation spectra, and measurement of the lifetimes of the excited states. Two Eu3+ sites have been detected: (i) in regular framework positions, and (ii) replacing Na+ ions in the tunnels. Samples containing only Eu3+ or Tb3+ emit mainly from one transition, respectively, D-5(0) --> F-7(2) ( 610 nm, red) and D-5(4) --> F-7(5) (550 nm, green). Mixed lanthanide samples, Na5Eu0.75Tb0.25Si4O12 and Na5Eu0.25Tb0.75Si4O12, have also been prepared and efficient Tb --> Eu energy transfer has been observed for the latter.
publisher ROYAL SOC CHEMISTRY
issn 0959-9428
year published 2006
volume 16
issue 30
beginning page 3139
ending page 3144
digital object identifier (doi) 10.1039/b604653c
web of science category Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000239251000010
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