کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1497753 | 1510802 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low temperature microwave study of photoconductivity in rare-earth-doped dielectric crystals
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Transient photoconductivity induced by UV (355Â nm) laser pulses in doped dielectric crystals CaF2:Sm2+, CaF2:Eu2+ and LSO:Ce3+ was studied by 8-mm microwave technique in a wide range of temperatures, from 300Â K down to 5Â K. It was possible to study the dynamics of free and bound photoexcited electrons. In LSO:Ce3+, the thermally-activated photoionization process at room temperature changes to a two-step photoionization at liquid helium temperature. In CaF2:Eu2+, two-step photoionization was detected at any temperature and electronic traps cause broadening of the photoconductivity signal at low temperature. In CaF2:Sm2+, the one-step photoionization process was confirmed at any temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 28, Issues 1â2, January 2006, Pages 35-40
Journal: Optical Materials - Volume 28, Issues 1â2, January 2006, Pages 35-40
نویسندگان
M.-F. Joubert, S.A. Kazanskii, Y. Guyot, H. Loudyi, J.-C. Gâcon, C. Pédrini,