The Effect of Annealing, Synthesis Temperature and Structure on Photoluminescence Properties of Eu-Doped ZnO Nanorods

در اين مقاله ZnO دوپ نشده و دوپ شده با Eu با روش نشست شيميايي از فاز بخار سنتز شدند. تاثير آنيلينگ، دماي سنتز و ساختار بر روي خواص فوتولومينسانسي ZnO دوپ شده با Eu بررسي گرديد. نمونه هاي سنتز شده بوسيله ي پرش اشعه X (XRD)، ميكروسوپ الكتروني روبشي (SEM)، آناليز اندازه ذرات (PSA) و اسپكتروسكوپي فوتولومينسانسي (PL) بررسي شد. نتايج XRD نشان داد كه همه نمونه ها داراي ساختار ورتزيت بوده و يون هاي +3 Eu داخل شبكه ZnO قرار گرفته اند. آناليز SEM و PSA نشان داد كه نانوميله ها نسبت سطح به حجم بالاتري نسبت به ميكروميله ها دارند. همچنين اين مطالعه نشان داد كه انرژي از ZnO به عنوان ميزبان به يون هاي Eu از طريق نقص هاي ذاتي منتقل مي شود.

In this study un-doped and Eu-doped ZnO nanorods and microrads were fabricated by Chemical Vapor Deposition (CVD) method. The effects of annealing, synthesis temperature and structure on structural and photoluminescence properties of Eu-doped ZnO samples were studied in detail. Prepared samples were characterized using X-Ray diffraction (XRD), scanning electron microscopy (SEM), particle size analysis (PSA) and Photoluminescence Spectroscopy (PL) analysis. XRD results indicated that all of samples have a wurtzite structure and Eu3+ ions were incorporated successfully into the lattice of ZnO nanostructures. SEM and PSA analysis exhibit nanorads rather than microrads samples have a more surface to volume ratio which cause to enhance surface defects. This study recommends that energy transfer (ET) from ZnO host to Eu ions via intrinsic defects at indirect excitation. By annealing due to decease of intrinsic defects particularly oxygen vacancy ET and consequently Eu ions emissions are decreased considerably. Pl analysis exhibit relative intensities of the electric-dipole and magnetic-dipole transitions were changed in different growth conditions.