Silica spheres doped with Eu （TTFA）3 and/or Sm（TTFA）3 were synthesized by using the modified Stober method. The transmission electron microscope image reveals that the hybrid spheres have smooth surfaces and an av...Silica spheres doped with Eu （TTFA）3 and/or Sm（TTFA）3 were synthesized by using the modified Stober method. The transmission electron microscope image reveals that the hybrid spheres have smooth surfaces and an average diameter of about 210 nm. Fluorescence spectrometer was used to analyze the fluorescence properties of hybrid spheres. The results show that multiple energy transfer processes are simultaneously achieved in the same samples co-doped with Eu （TTFA）3 and Sm（TTFA）3, namely between the ligand and Eu^3＋ ion, the ligand and Sm^3＋ ion, and Sm^3＋ ion and Eu^3＋ ion. Energy transfer of Sm^3＋→Eu^3＋ in the hybrid spheres leads to fluorescence enhancement of Eu^3＋ emission by approximately an order of magnitude. The lifetimes of the hybrid spheres were also measured.展开更多
The objective of this work was to develop possible materials for optically stimulated luminescence （OSL） dosimetric applications in real-time measurement. A novel material of LiMgPO4：Tb,Sm,B was prepared by solid-s...The objective of this work was to develop possible materials for optically stimulated luminescence （OSL） dosimetric applications in real-time measurement. A novel material of LiMgPO4：Tb,Sm,B was prepared by solid-state diffusion method at 900 oC. The structure and optical properties of these phosphors were characterized by X-ray diffraction, fluorescence spectro？photometer, and OSL reader. The results showed that the full discrimination between the stimulation and emission spectra made them very fit for the optic-fibre dosimetry. The OSL vs. dose response was linear in the dose range of 0.1 to 216 Gy. It also showed a significant improvement in the stimulation time compared with LiMgPO4：Tb,B. Hence, the phosphor could be used in the real-time dosimeter based on the OSL technology for medical monitoring as well as for environmental dosimetry and space dosimetry.展开更多
Mesoporous GdPO4:Eu@SiO2@mSiO2 core-shell nanorods(NRs) were prepared by a facile two-step method.First,the monodispersed GdPO4:Eu NRs were obtained on a large scale via a facile precipitation method,then mesoporous s...Mesoporous GdPO4:Eu@SiO2@mSiO2 core-shell nanorods(NRs) were prepared by a facile two-step method.First,the monodispersed GdPO4:Eu NRs were obtained on a large scale via a facile precipitation method,then mesoporous silica was wrapped onto their surface through hydrolysis of tetraethylorthosilicate(TEOS).The XRD result indicates that the as-prepared GdPO4:Eu NRs core has hexagonal phase.The FTIR and the N2 adsorption/desorption isotherm analysis confirm the successful coating of mesoporous silica.The TEM images show that the obtained GdPO4:Eu@SiO2@mSiO2 NRs exhibit uniform monodisperse core-shell structure with a nanorod core(length of 200 nm;width of 20 nm),and mesoporous silica shell of 15 nm.Under excitation of 274 nm,GdPO4:Eu@SiO2@mSiO2 NRs show strong red luminescence from 5 D0→7 FJ(J=1,2,3 and 4) transitions of Eu3+.Furthermore,the GdPO4:Eu@-SiO2@mSiO2 NRs exhibit obvious T1 enhancement effect due to paramagnetism of Gd3+.The drug loading capacity and pH-sensitive releasing behavior of the as-prepared GdPO4:Eu@SiO2@mSiO2 NRs were studied by using doxorubicin(DOX) as model drug.The excellent biocompatibility of GdPO4:Eu@-SiO2@mSiO2 NRs was demonstrated by MTT assay.Taken together,the mesoporous GdPO4:Eu@-SiO2@mSiO2 NRs may be potentially applied in fields of drug delivery and dual-modal imaging.展开更多
文摘Silica spheres doped with Eu （TTFA）3 and/or Sm（TTFA）3 were synthesized by using the modified Stober method. The transmission electron microscope image reveals that the hybrid spheres have smooth surfaces and an average diameter of about 210 nm. Fluorescence spectrometer was used to analyze the fluorescence properties of hybrid spheres. The results show that multiple energy transfer processes are simultaneously achieved in the same samples co-doped with Eu （TTFA）3 and Sm（TTFA）3, namely between the ligand and Eu^3＋ ion, the ligand and Sm^3＋ ion, and Sm^3＋ ion and Eu^3＋ ion. Energy transfer of Sm^3＋→Eu^3＋ in the hybrid spheres leads to fluorescence enhancement of Eu^3＋ emission by approximately an order of magnitude. The lifetimes of the hybrid spheres were also measured.
基金supported by National Natural Science Foundation of China(10875168,10475112)
文摘The objective of this work was to develop possible materials for optically stimulated luminescence （OSL） dosimetric applications in real-time measurement. A novel material of LiMgPO4：Tb,Sm,B was prepared by solid-state diffusion method at 900 oC. The structure and optical properties of these phosphors were characterized by X-ray diffraction, fluorescence spectro？photometer, and OSL reader. The results showed that the full discrimination between the stimulation and emission spectra made them very fit for the optic-fibre dosimetry. The OSL vs. dose response was linear in the dose range of 0.1 to 216 Gy. It also showed a significant improvement in the stimulation time compared with LiMgPO4：Tb,B. Hence, the phosphor could be used in the real-time dosimeter based on the OSL technology for medical monitoring as well as for environmental dosimetry and space dosimetry.
基金Project supported by the National Natural Science Foundation of China (21676131)the Natural Science Foundation of Jiangxi Province(20143ACB20012)。
文摘Mesoporous GdPO4:Eu@SiO2@mSiO2 core-shell nanorods(NRs) were prepared by a facile two-step method.First,the monodispersed GdPO4:Eu NRs were obtained on a large scale via a facile precipitation method,then mesoporous silica was wrapped onto their surface through hydrolysis of tetraethylorthosilicate(TEOS).The XRD result indicates that the as-prepared GdPO4:Eu NRs core has hexagonal phase.The FTIR and the N2 adsorption/desorption isotherm analysis confirm the successful coating of mesoporous silica.The TEM images show that the obtained GdPO4:Eu@SiO2@mSiO2 NRs exhibit uniform monodisperse core-shell structure with a nanorod core(length of 200 nm;width of 20 nm),and mesoporous silica shell of 15 nm.Under excitation of 274 nm,GdPO4:Eu@SiO2@mSiO2 NRs show strong red luminescence from 5 D0→7 FJ(J=1,2,3 and 4) transitions of Eu3+.Furthermore,the GdPO4:Eu@-SiO2@mSiO2 NRs exhibit obvious T1 enhancement effect due to paramagnetism of Gd3+.The drug loading capacity and pH-sensitive releasing behavior of the as-prepared GdPO4:Eu@SiO2@mSiO2 NRs were studied by using doxorubicin(DOX) as model drug.The excellent biocompatibility of GdPO4:Eu@-SiO2@mSiO2 NRs was demonstrated by MTT assay.Taken together,the mesoporous GdPO4:Eu@-SiO2@mSiO2 NRs may be potentially applied in fields of drug delivery and dual-modal imaging.
