کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1644985 1517278 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Relation between shell thickness and near infrared photoluminescence of LaPO4:Yb3+/GdPO4 core/shell nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Relation between shell thickness and near infrared photoluminescence of LaPO4:Yb3+/GdPO4 core/shell nanoparticles
چکیده انگلیسی


• LaPO4:Yb3+/GdPO4 core/shell nanoparticles GdPO4 shell epitaxially grows on LaPO4:Yb3+ core.
• NIR emission at 976 nm under 940 nm NIR excitation.
• Coating of LaPO4:Yb3+ core with one monolayer of GdPO4 shell enhances NIR emission.

LaPO4:Yb3+ core and LaPO4:Yb3+/GdPO4 core/shell nanoparticles (NPs) are prepared from lanthanide chlorides and orthophosphoric acid at 200 °C using diphenyl ether as a solvent with tributyl phosphate and trihexyl amine as coordinating molecules. Near infrared (NIR) emission is observed at 976 nm under 940 nm NIR excitation for both NPs, where these excitation and emission occur through transitions between Stark splitting levels of 2F7/2 and 2F5/2 of Yb3+. High resolution TEM observation reveals that LaPO4:Yb3+/GdPO4 core/shell consists of a single crystalline domain and hence the GdPO4 shell epitaxially grows on LaPO4:Yb3+ core. We investigate the change in NIR emission intensity and shell thickness with reaction time at 200 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 110, 1 November 2013, Pages 180–183
نویسندگان
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