Photoluminescence imaging of Eu(III) and Tb(III)-embedded SiO2 nanostructures

Title
Photoluminescence imaging of Eu(III) and Tb(III)-embedded SiO2 nanostructures
Author(s)
손영구최영인윤영혜강준길[강준길]
Keywords
LUMINESCENCE PROPERTIES; TB3+; NANOCRYSTALS; PARTICLES; NANOPARTICLES; NANOSPHERES; EUROPIUM; EU3+; GEL; MICROSPHERES
Issue Date
201502
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF LUMINESCENCE, v.158, pp.27 - 31
Abstract
We prepared SiO2 embedded with Eu(III) and Tb(III) by a modified after method. The nanostructures were highly thermal stable and showed a significant enhancement in photoluminescence after thermal annealing at above 600 degrees C. Emissions by indirect charge transfer excitation were much stronger than those in response to a direct excitation transition. 2D and 3D-photoluminescence image profiles were fully examined, and the emissions of Eu(III) observed between 570 and 720 nm and Tb(III) between 450 and 700 nm were attributed to the D-5(0)-> F-7(J) (J=0,1,2,3,4) and D-5(4)-> F-7(J) (J=6,5,4,3) transitions, respectively. The Eu(III) and Tb(III) appeared to be embedded at sites with lower symmetry without an inversion center. In the SiO2 matrix, the oxidation states of Eu(III) and Tb(III) showed no change, even after thermal annealing. The present study describes an effective methodology for developing efficient light emitting materials using an activator ion-embedded silica structure. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/33624http://dx.doi.org/10.1016/j.jlumin.2014.09.030
ISSN
0022-2313
Appears in Collections:
이과대학 > 화학생화학부 > Articles
문과대학 > 중국언어문화학과 > Articles
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