کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1494025 1510796 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Two new cerium-doped mixed-anion elpasolite scintillators: Cs2NaYBr3I3 and Cs2NaLaBr3I3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Two new cerium-doped mixed-anion elpasolite scintillators: Cs2NaYBr3I3 and Cs2NaLaBr3I3
چکیده انگلیسی


• Mixed-anion Ce-doped Cs2NaREBr3I3 (RE = La, Y) scintillators are firstly reported.
• The isotropic crystal structure leads to crack-free single crystal.
• Excellent energy resolution between 2.9% and 3.3% is achieved at 662 keV.
• The intrinsic energy resolution is comparable to Ce-doped LaBr3.
• Scintillation decay time is dependent on the Ce concentration.

We recently discovered that mixed-anion Br–I elpasolite scintillators, Cs2NaYBr3I3: Ce and Cs2NaLaBr3I3: Ce, have promising performance. Ce concentration of these compounds was optimized in terms of light yield. Cs2NaLaBr3I3 with 5% Ce (by mole) has a light yield of 58,000 ph/MeV, and excellent energy resolution of 2.9% at 662 keV. It is better than both endpoint compounds of the Br–I solid solution. Cs2NaYBr3I3 with 2% Ce doping shows energy resolution of 3.3% at 662 keV, despite a relatively modest light yield of 43,000 ph/MeV. Non-proportionality of the mixed Br–I compounds was measured using gamma ray sources ranging in energy from 14 keV to 835 keV.The electronic band gaps of undoped Cs2NaLaBr3I3 and Cs2NaYBr3I3 were determined from optical transmittance and absorbance measurements. The band gaps of the compounds are 4.4 ± 0.1 eV, and 4.3 ± 0.1 eV, respectively.The crystal structures of Cs2NaLaBr3I3: Ce and Cs2NaYBr3I3: Ce are tetragonal and cubic respectively. The high symmetry leads to fewer cracks during crystal growth and minimizes light scattering at grain boundaries. The ease of crystal growth is promising for the scale-up of the growth process to larger sizes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 38, December 2014, Pages 154–160
نویسندگان
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