کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7840134 1505864 2018 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature dependence of 4fn−15d1→4fn luminescence of Ce3+ and Pr3+ ions in Sr2GeO4 host
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Temperature dependence of 4fn−15d1→4fn luminescence of Ce3+ and Pr3+ ions in Sr2GeO4 host
چکیده انگلیسی
Photoluminescence of Ce3+- and Pr3+-activated Sr2GeO4 powders was measured between 17 and 600 K. For both ions strong 4fn−15dn→4fn (d-f) emission is observed at low temperatures, around 410 nm (Ce3+) and 280 nm (Pr3+). The Ce3+ d-f emission quenches starting at 150 K and disappearing completely just above room temperature. Pr3+ d-f luminescence shows an onset of quenching also around 150 K and disappears completely between 250 and 300 K. For Pr3+ quenching of the d-f emission was connected with an increasing intensity of the 3P0 luminescence at first and 1D2 emission at even higher temperatures. Both these 4fn→4fn emissions were observed up to 600 K. Based on the similar quenching temperatures, thermally stimulated photoionization of the 5d electrons from 5d level of Ce3+ or Pr3+ to the conduction band is proposed as the most probable mechanism for quenching of the d-f emissions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 198, June 2018, Pages 163-170
نویسندگان
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