The interaction of TbC13 and lanthanide（Ⅲ） β-diketonate complexes with poly（N-vinylpyrrolidone） （PVP） polymer was studied using fluorescence spectroscopy. In the presence of PVP the emission of Tb3＋ in cthano...The interaction of TbC13 and lanthanide（Ⅲ） β-diketonate complexes with poly（N-vinylpyrrolidone） （PVP） polymer was studied using fluorescence spectroscopy. In the presence of PVP the emission of Tb3＋ in cthanolic solution of TbCl3 significantly in- creased owing to the excitation energy transfer from PVP to Tb3＋ ions, which was more efficient as compared to a direct excitation of the Tb3＋ 4f75d1 levels. In contrast, emission of NEt4Tb（hfa）4 and NEt4Eu（hfa）4 complexes was almost completely quenched in solu- tion containing PVP. The PVP bound both Ln3＋ ions and hfa ligands which caused decomposition of Ln-hfa complexes and switched off the excitation energy transfer from the ligand to the emitting Ln3＋ ion. The important role of hydrogen bonds in stabilization of in- teraction ofhfa ligands with PVP was indicated.展开更多
Tb3＋-doped ZnSe and ZnSe/ZnS nanocrystals were synthesized using modified hot-injection method. The observation of the characteristic quantum dots absorption features in a time-gated excitation spectrum was recorded ...Tb3＋-doped ZnSe and ZnSe/ZnS nanocrystals were synthesized using modified hot-injection method. The observation of the characteristic quantum dots absorption features in a time-gated excitation spectrum was recorded while monitoring Tb3＋ emission at 545 nm provided direct evidence for successful incorporation of dopant ions into semiconductor host. Relatively long decay time （-1.5 ms） of Tb3＋ emission indicated that dopant ions were well protected from interaction with surface ligands. Emission properties of core ZnSe：Tb3＋ nanocrystals were only slightly modified upon growth of ZnS shell.展开更多
文摘The interaction of TbC13 and lanthanide（Ⅲ） β-diketonate complexes with poly（N-vinylpyrrolidone） （PVP） polymer was studied using fluorescence spectroscopy. In the presence of PVP the emission of Tb3＋ in cthanolic solution of TbCl3 significantly in- creased owing to the excitation energy transfer from PVP to Tb3＋ ions, which was more efficient as compared to a direct excitation of the Tb3＋ 4f75d1 levels. In contrast, emission of NEt4Tb（hfa）4 and NEt4Eu（hfa）4 complexes was almost completely quenched in solu- tion containing PVP. The PVP bound both Ln3＋ ions and hfa ligands which caused decomposition of Ln-hfa complexes and switched off the excitation energy transfer from the ligand to the emitting Ln3＋ ion. The important role of hydrogen bonds in stabilization of in- teraction ofhfa ligands with PVP was indicated.
基金Project supported by Wroclaw Research Centre EIT+within the project"The Application of Nanotechnology in Advanced Materials”-Nano Mat(POIG.01.01.02-02-002/08) co-financed by the European Regional Development Fund(Operational Programme Innovative Economy,1.1.2)
文摘Tb3＋-doped ZnSe and ZnSe/ZnS nanocrystals were synthesized using modified hot-injection method. The observation of the characteristic quantum dots absorption features in a time-gated excitation spectrum was recorded while monitoring Tb3＋ emission at 545 nm provided direct evidence for successful incorporation of dopant ions into semiconductor host. Relatively long decay time （-1.5 ms） of Tb3＋ emission indicated that dopant ions were well protected from interaction with surface ligands. Emission properties of core ZnSe：Tb3＋ nanocrystals were only slightly modified upon growth of ZnS shell.
