کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5454895 | 1514360 | 2017 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
HRTEM morphological features on grain boundary diffusion and particulate necking, photoluminescence and thermoluminescence investigations of nano Ce3Â +:LuAG
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Homogeneous and non-agglomerative Ce:LuAG nanoparticles with different Ce3 + doping concentrations (0.05, 0.10 and 0.15 mol%) were prepared by surfactant free aqueous precipitation synthesis via low temperature refluxer route. The synthesized powders are post calcined at 900 °C and 1300 °C for 4 h; and characterized by thermo-gravimetric (TG), differential scanning calorimetry (DSC), X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM), high resolution transmission electron microscopy (HR-TEM), photoluminescence (PL), decay life-time (DLT) and thermoluminescence (TL) techniques. XRD result confirms the formation of cubic phase without the evolution of any intermediate and secondary phases. HR-SEM shows that the nanoparticles synthesized by the surfactant-free approach resulted in non-agglomerated spheroidal morphology. An attempt is also made to calculate grain boundary diffusion (Dgb) parameter of Ce:LuAG nanoparticles observed from TEM nano-particulate necking morphology. The nanophosphor exhibit enhanced green luminescence (λem = 505 nm) under blue light excitation (λex = 450 nm). The TL behavior is also investigated under the exposure of γ-ray (60Co) source. TL dosimetric parameters such as order of kinetics (μg), activation energy (E) and frequency factor (S) are calculated using Chen's equation. The fast DLT of ~ 17 ns observed in the Ce:LuAG nanophosphors can be useful for scintillators and fluorescent device applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 127, May 2017, Pages 77-87
Journal: Materials Characterization - Volume 127, May 2017, Pages 77-87
نویسندگان
S. Arun Kumar, K. Asokan, J. Senthilselvan,