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Synthesis and Photoluminescence Properties of Eu(3+) -Doped Silica@Coordination Polymer Core-Shell Structures and Their Calcinated Silica@Gd(2) O(3) :Eu and Hollow Gd(2) O(3) :Eu Microsphere Products.
MedLine Citation:
PMID:  23060055     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The conjugation of Eu(3+) -doped coordination polymers constructed from Gd(3+) and isophthalic acid (H(2) IPA) with silica particles is investigated for the production of luminescent microspheres. A series of doping ratio-controlled silica@coordination polymer core-shell spheres is easily synthesized by altering the amounts of metal nodes used in the reactions, where the ratios of Gd(3+) and Eu(3+) are 10:0 (1a), 9:1 (1b), 8:2 (1c), 7:3 (1d), 5:5 (1e), and 0:10 (1f). The formation of monodisperse uniform core-shell structures is achieved throughout the entirety of a series. Investigations of the photoluminescence property of the resulting series of silica@coordination polymer core-shell spheres reveal that 20% Eu(3+) -doped product (1c) has the strongest emission intensity. The subsequent calcination process on the silica@coordination polymer core-shell structures (1a-f) results in the formation of a series of doping ratio-controlled silica@Gd(2) O(3) :Eu core-shell microspheres (2a-f) with uniform shell thickness. During the calcination step, the coordination polymers within silica@coordination polymer core-shells are transformed into metal oxides, resulting in silica@Gd(2) O(3) :Eu core-shell structures. The final etching process on the silica@Gd(2) O(3) :Eu core-shell microspheres (2a-f) produces a series of hollow Gd(2) O(3) :Eu microspheres (3a-f) as a result of the elimination of silica cores. The luminescence intensities of silica@Gd(2) O(3) :Eu core-shell (2a-f) and hollow Gd(2) O(3) :Eu microspheres (3a-f) also vary depending upon the doping ratio of Eu(3+) ions.
Authors:
Hee Jung Lee; Ju-Un Park; Sora Choi; Juhee Son; Moonhyun Oh
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-12
Journal Detail:
Title:  Small (Weinheim an der Bergstrasse, Germany)     Volume:  -     ISSN:  1613-6829     ISO Abbreviation:  Small     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101235338     Medline TA:  Small     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Affiliation:
Department of Chemistry, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea.
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