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Study of Tb-doped Li2O-LaF3-Al2O3-SiO2 Glasses Containing Silver Nanoparticles

Published online by Cambridge University Press:  31 January 2011

Zhengda Pan ,
A Crosby ,
O Obadina ,
A. Ueda ,
R. Aga .Jr ,
R. Mu  and
S. H. Morgan
Zhengda Pan
Affiliation:
zpan@fisk.edu, Fisk University, Fisk - Physivs, 1000 17th Ave N, Nashville, Tennessee, 37208, United States
A Crosby
Affiliation:
alexis.crosby@case.edu, Fisk University, Nashville, Tennessee, United States
O Obadina
Affiliation:
lanre_obadina@yahoo.com, Fisk University, Nashville, Tennessee, United States
A. Ueda
Affiliation:
aueda@fisk.edu, Fisk University, Nashville, Tennessee, United States
R. Aga .Jr
Affiliation:
raga@fisk.edu, Fisk University, Nashville, Tennessee, United States
R. Mu
Affiliation:
rmu@fisk.edu, Fisk University, Nashville, Tennessee, United States
S. H. Morgan
Affiliation:
smorgan@fisk.edu, Fisk University, Nashville, Tennessee, United States
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Abstract

Tb-doped Li2O-LaF3-Al2O3-SiO2 (LLAS) glasses containing silver were fabricated using melt-quenching technique. Silver nanoparticles (NPs) in glass matrix were confirmed by optical absorption and X-ray diffraction (XRD). The nucleation of silver NPs was controlled by heat-treatment. A broad absorption band peaked at about 420 nm was observed due to surface plasmon resonance (SPR) of the silver NPs. This SPR absorption of silver NPs increases with the time of heat-treatment. Photoluminescence (PL) emission and excitation spectra were measured on Tb-doped LLAS glasses with and without silver NPs. Strong Tb3+ luminescence was observed. For excitation at 325 nm, luminescence of Tb3+ ions increases for the glass containing silver NPs compared to that in the glass without silver NPs. After further heat-treatment at 520 °C for 5 hours, Tb3+ luminescence decreased. Our luminescence results suggest that there are two competitive effects, enhancement and quenching effects, acting on Tb3+ luminescence in the glass containing silver NPs. The enhancement of Tb3+ luminescence is attributed to local field effects due to the excitation of SPR of silver NPs. The quenching effect in the presence of Ag NPs suggests an energy transfer from Tb3+ ions to silver NPs exists, which may provide an additional non-radiative relaxation pathway for the excited Tb3+ ions.

Keywords

ErluminescenceAg
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1208: Symposium O – Excitons and Plasmon Resonances in Nanostructures II , 2009 , 1208-O09-16
Copyright
Copyright © Materials Research Society 2010

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