کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9783119 1511869 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Visible up-conversion luminescence in Er3+-doped PbWO4 single crystals
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Visible up-conversion luminescence in Er3+-doped PbWO4 single crystals
چکیده انگلیسی
Visible up-conversion luminescence at 528, 550 and 660 nm have been observed in Er3+-doped PbWO4 crystals under infrared excitations at both 970 and 800 nm. The crystal shows more efficient up-conversion emissions under pumping by 800 nm laser diode (LD) than that obtained under LD 970 nm. Higher is the doping concentration of Er3+ in PbWO4 crystal, stronger is intensity of up-conversion luminescence. Different from the up-conversion luminescence, normal luminescence of Er3+ under excitation of X-ray and Xenon lamp at 379 nm were quenched in PbWO4 crystals at a higher Er3+ doping concentration. Pumping power measurements were also carried out. Combined with the energy level structure of Er3+ and the decay kinetics of the green emissions, the possible up-conversion luminescence mechanism has been analyzed and explained, which were closely related to the Er3+ doping concentrations. In PbWO4 crystals with low Er3+ doping, the up-conversion is populated mainly through excited-state absorption; and through energy-transfer processes at higher Er3+ ions doping levels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 91, Issues 2–3, 15 June 2005, Pages 424-430
نویسندگان
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