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Novel Photofunctional Multicomponent Rare Earth (Eu 3+ , Tb 3+ , Sm 3+ and Dy 3+ ) Hybrids with Double Cross‐linking Siloxane Covalently Bonding SiO 2 /ZnS Nanocomposite
Author(s) -
Yan Bing,
Zhao Yan,
Li YaJuan
Publication year - 2011
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2011.00920.x
Subject(s) - siloxane , hybrid material , covalent bond , luminescence , nanocomposite , photoluminescence , materials science , chemistry , crystallography , polymer , nanotechnology , organic chemistry , optoelectronics
Zinc sulfide (ZnS) quantum dot is modified with 3‐mercaptopropyltrimethoxysilane (MPTMS) to obtain MPTMS functionalized SiO 2 /ZnS nanocomposite. Novel rare earth/inorganic/organic hybrid materials are prepared by using 3‐(triethoxysilyl)‐propyl isocyanate (TESPIC) as an organic bridge molecule that can both coordinate to rare earth ions (Eu 3+ , Tb 3+ , Sm 3+ and Dy 3+ ) and form an inorganic Si–O–Si network with SiO 2 /ZnS nanocomposite after cohydrolysis and copolycondensation through a sol‐gel process. These multicomponent hybrids with double cross‐linking siloxane (TESPIC‐MPTMS) covalently bonding SiO 2 /ZnS and assistant ligands (Phen = 1,10‐phenanthroline, Bipy = 2,2′‐bipyridyl) are characterized and especially the photoluminescence properties of them are studied in detail. The luminescent spectra of the hybrids show the dominant excitation of TESPIC‐MPTMS‐SiO 2 /ZnS unit and the unique emission of rare earth ions, suggesting that TESPIC‐MPTMS‐SiO 2 /ZnS unit behaves as the main energy donor and effective energy transfer take place between it and rare earth ions. Besides, the luminescent performance of Bipy‐RE‐TESPIC‐MPTM‐SiO 2 /ZnS hybrids are superior to that of Phen‐RE‐TESPIC‐MPTMS‐SiO 2 /ZnS ones (RE=Eu, Tb, Sm, Dy), which reveals that Bipy or Phen only act as structural ligand within the hybrid systems.