Journal
NANOSCALE RESEARCH LETTERS
Volume 5, Issue 12, Pages 1952-1961Publisher
SPRINGER
DOI: 10.1007/s11671-010-9732-9
Keywords
Mesoporous molecular sieve SBA-15; Rare-earth ions; Photoluminescence; Cooperative upconversion; Judd-Ofelt theory
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SiO(2) mesoporous molecular sieve SBA-15 with the incorporation of erbium ions is studied as a novel type of nanoscopic composite photoluminescent material in this paper. To enhance the photoluminescence efficiency, two schemes have been used for the incorporation of Er(3+) where (1) Er(3+) is ligated with bis-(perfluoromethylsulfonyl)- aminate (PMS) forming Er(PMS) x-SBA-15 and (2) Yb(3+) is codoped with Er(3+) forming Yb-Er-SBA-15. As high as 11.17 x 10(-21) cm(2) of fluorescent cross section at 1534 nm and 88 nm of effective bandwidth'' have been gained. It is a 29.3% boost in fluorescent cross section compared to what has been obtained in conventional silica. The upconversion coefficient in Yb-Er-SBA-15 is relatively small compared to that in other ordinary glass hosts. The increased fluorescent cross section and lowered upconversion coefficient could benefit for the high-gain optical amplifier. Finally, the Judd-Ofelt theory has also been used for the analyses of the optical spectra of Er(PMS) x-SBA-15.
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