کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1495758 992944 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, luminescence and scintillation of rare earth doped lanthanum fluoride nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Synthesis, luminescence and scintillation of rare earth doped lanthanum fluoride nanoparticles
چکیده انگلیسی

Scintillation from nanoparticles is a nascent field but offers valuable fundamental insights and practical utilities. In this work, the scintillation response of LaF3:Eu nanoparticles is reported. Core/multi-shell nanoparticles were prepared using a modified solution precipitation method that takes advantage of the organic ligand ammonium di-n-octadecyldithiophosphate (ADDP) to simultaneously achieve shelling of doped core nanoparticles while avoiding agglomeration. Nanoparticles were characterized on their structure, morphology, luminescence, and scintillation behavior by means of X-ray diffraction, transmission electron microscopy, photoluminescence, and radioluminescence (RL) measurements, respectively. Analysis of the scintillation process revealed that the unique aspect of scintillation in nanoparticles when compared to bulk materials is related to the migration of carriers within the nanoparticle. Cladding of the Eu-doped core with an undoped shell was found to increase scintillation intensity by a factor of 3, and further shelling leads to a continuous decrease in RL intensity. Surface passivation, together with the decreasing probability of radiative recombination of carriers at the luminescent centers in the core with increasing number of shells grown around the core are suggested to describe the observed RL intensity behavior. Scintillation enhancement by means of shelling is a promising pathway to enhance the use of scintillator nanoparticles in detection devices.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 33, Issue 2, December 2010, Pages 136–140
نویسندگان
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