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 4fnâ15d1â4fn luminescence of Ce3+ and Pr3+ ions in Sr2GeO4 host
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Photoluminescence of Ce3+- and Pr3+-activated Sr2GeO4 powders was measured between 17 and 600â¯K. For both ions strong 4fnâ15dnâ4fn (d-f) emission is observed at low temperatures, around 410â¯nm (Ce3+) and 280â¯nm (Pr3+). The Ce3+ d-f emission quenches starting at 150â¯K and disappearing completely just above room temperature. Pr3+ d-f luminescence shows an onset of quenching also around 150â¯K and disappears completely between 250 and 300â¯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 4fnâ4fn emissions were observed up to 600â¯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
Journal: Journal of Luminescence - Volume 198, June 2018, Pages 163-170
نویسندگان
Karolina Fiaczyk, Shun Omagari, Andries Meijerink, Eugeniusz Zych,