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Báo cáo hóa học: " Highly Efficient Near-IR Photoluminescence of Er3+ Immobilized in Mesoporous SBA-15"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Highly Efficient Near-IR Photoluminescence of Er3+ Immobilized in Mesoporous SBA-15 | Nanoscale Res Lett 2010 5 1952-1961 DOI 10.1007 s11671-010-9732-9 NANO EXPRESS Highly Efficient Near-IR Photoluminescence of Er3 Immobilized in Mesoporous SBA-15 Y. L. Xue P. Wu Y. Liu X. Zhang L. Lin Q. Jiang Received 23 February 2010 Accepted 4 August 2010 Published online 24 August 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract SiO2 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 Er3 where 1 Er3 is ligated with bis- perfluoromethylsulfo-nyl -aminate PMS forming Er PMS x-SBA-15 and 2 Yb3 is codoped with Er3 forming Yb-Er-SBA-15. As high as 11.17 X 10 21cm2 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. Keywords Mesoporous molecular sieve SBA-15 Rare-earth ions Photoluminescence Cooperative upconversion Judd-Ofelt theory Y. L. Xue L. Lin Q. Jiang Department of Electronic Engineering East China Normal University 500 Dongchuan Road Shanghai 200241 China e-mail ylxue@ee.ecnu.edu.cn P. Wu Y. Liu X. Zhang Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal University 500 Dongchuan Road Shanghai 200241 China Introduction Lanthanide ion Er3 has usually been immobilized in disordered host materials like silicas and aluminosilicates for applications in optical communications. In recent years .