کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5439169 1398192 2017 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sol-gel-nitridation preparation and photoluminescence properties of Dy3+-doped M2Si5N8 (M=Ca, Sr, Ba) phosphors for white light emitting diodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Sol-gel-nitridation preparation and photoluminescence properties of Dy3+-doped M2Si5N8 (M=Ca, Sr, Ba) phosphors for white light emitting diodes
چکیده انگلیسی
M2Si5N8:Dy3+(M=Ca, Sr, Ba) nitride phosphors with different Dy3+ ion concentrations were prepared via a novel sol-gel-nitridation method involving an annealing step at 1300 or 1400 °C. The X-ray diffraction patterns indicate that the structure of these phosphors is in good agreement with the standard M2Si5N8 crystal structure. The photoluminescence spectra recorded for the prepared phosphors exhibited an intense white emission consisting of a blue emission peak (485 nm) and a yellow emission peak (582 nm), which are attributed to the characteristic 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions of the Dy3+ ions, respectively. When using a different alkaline earth metal, the structure of the resulting M2Si5N8 phosphors changed and the luminescence was also affected. The chromaticity coordinates of the prepared Sr2Si5N8:Dy3+, Ca2Si5N8:Dy3+, Ba2Si5N8:Dy3+ phosphors with blue and yellow emission peaks were (x=0.391, y=0.397), (x=0.448, y=0.433) and, (x=0.42, y=0.414), respectively, which are all close to the standard white light coordinates (0.33, 0.33). The lifetime values of the obtained Ca2Si5N8:Dy3+, Sr2Si5N8:Dy3+ and Ba2Si5N8:Dy3+ phosphors were determined to be 0.028, 0.0167 and 0.0113 ms, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 1, Part B, January 2017, Pages 1080-1085
نویسندگان
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