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

摘要

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. 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.