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
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
Visible up-conversion luminescence at 528, 550 and 660Â nm have been observed in Er3+-doped PbWO4 crystals under infrared excitations at both 970 and 800Â nm. The crystal shows more efficient up-conversion emissions under pumping by 800Â nm laser diode (LD) than that obtained under LD 970Â 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 379Â 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 2â3, 15 June 2005, Pages 424-430
Journal: Materials Chemistry and Physics - Volume 91, Issues 2â3, 15 June 2005, Pages 424-430
نویسندگان
Yanlin Huang, Hyo Jin Seo, Yu Yang, Jian Zhang,