کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5397634 | 1505876 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lattice mismatch and energy transfer of Eu- and Dy-codoped MO-Al2O3-SrO (M=Mg, Ca, Ba) ternary compounds affecting luminescence behavior
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Lattice mismatch and energy transfer of Eu- and Dy-codoped MO-Al2O3-SrO (M=Mg, Ca, Ba) ternary compounds affecting luminescence behavior Lattice mismatch and energy transfer of Eu- and Dy-codoped MO-Al2O3-SrO (M=Mg, Ca, Ba) ternary compounds affecting luminescence behavior](/preview/png/5397634.png)
چکیده انگلیسی
A systematic investigation of energy transfers and luminescence behaviors for MxSr0.94âxAl2O4:Eu0.02, Dy0.04 (M=Mg, Ca, Ba; x=0, 0.235, 0.47, 0.705, 0.94) ternary compounds was accomplished. The results demonstrated that six phenomena must be fitted into the energy-transfer mechanisms of the ternary compounds: (1) the optical band-gap energy of Mg0.94Al2O4:Eu0.02Dy0.04 is extremely low and does not allow photoemission; (2) Ca2+ and Ba2+ ions are the main hosts when xâ¥0.47 in CaxSr1âxAl2O4:Eu0.02Dy0.04 and BaxSr1âxAl2O4:Eu0.02Dy0.04, respectively; (3) Eu3+ ions are the main activator ions in CaxSr1âxAl2O4:Eu0.02Dy0.04 with x=0.47 and in BaxSr1âxAl2O4:Eu0.02Dy0.04 with x=0.353â0.705; (4) Sr2+ and Eu2+ ions are the main host and activator ions, respectively, when x<0.353 in each ternary compound; (5) energy transfers from the MO phases to the SrO phase because the conduction band energy of SrO is the lowest; and (6) mutual substitution between alkaline-earth ions does not alter the resultant structures' crystal field and nephelauxetic effects, as determined by measuring their luminescence. Two energy transfer paths were discovered to be possible in CaO-Al2O3-SrO and BaO-Al2O3-SrO ternary compounds, and the boundaries determining which path was chosen were the atomic ratios Ca:Sr and Ba:Sr, both approximately 1.6:1 (x=0.353). Because second path increased the energy transferred from the MO band gap to the SrO band gap, the corresponding structure's spectrum emission intensity was approximately 4.3 times higher than that of the SrOâAl2O3 binary compound, and their photoluminescence was thus substantially higher.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 185, May 2017, Pages 263-271
Journal: Journal of Luminescence - Volume 185, May 2017, Pages 263-271
نویسندگان
Chen-Jui Liang, Kuan-Yu Huang,