کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5397734 | 1505873 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and up-conversion luminescence properties of BaFBr-Er3+@SiO2 core/shell heterostructures
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
BaFBr:Er3+@SiO2 core-shell composites were synthesized starting from BaFBr:Er3+ phosphor core grains (BaFBr doped with 1 at% Er3+) prepared by coprecipitation method. A sol-gel process was used to obtain the outer SiO2 layer shell from silica sol precursor. The polycrystalline BaFBr:Er3+@SiO2 heterostructures were formed following calcination at 700 °C, in air. The resulting material was characterized in terms of microstructure, photoluminescence and up-conversion luminescence properties. The results indicate that the as-obtained composite has a core-shell structure and shows good luminescence properties. The BaFBr:Er3+@SiO2 heterostructure is made of BaFBr:Er3+ square sheets encased in a SiO2 shell layer with thickness values between 100 and 400 nm. Under 810 nm laser light pumping, the core-shell heterostructure exhibits Er3+ green up-conversion luminescence bands ((2H11/2, 4S3/2) â 4I15/2) at 525 and 545 nm, ascribed to a two-photon process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 188, August 2017, Pages 96-100
Journal: Journal of Luminescence - Volume 188, August 2017, Pages 96-100
نویسندگان
Corina Elisabeta Secu, Mihail Secu, Marin Cernea,