کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5400043 | 1505913 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of replacement of AlO+ for SiN+ on the structure and optical properties of Sr2Si5N8:Eu2+phosphors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The influence of the replacement of SiN+ by AlO+ on crystal structure and luminescence properties is reported in a series of Sr2Si5âxAlxN8âxOx:0.02Eu2+ phosphors. Changes of refined lattice parameters of the powder X-ray diffraction data suggest that preferential occupation occurred in the evolution of crystal structure: only NII atoms which are connected with two Si atoms can be substituted by O atoms. It is evidenced that Al and O have adverse influence on the emission bands, which just keep the emission peak position around 620 nm. Time-resolved photoluminescence analysis has been employed to describe the energy transfer in Sr2Si5âxAlxN8âxOx:Eu2+ samples. The energy transfer effect depends partly on lattice vibration, i.e. phonon energy. Furthermore, the improved photoluminescence intensity and thermal quenching behavior after substituting of AlO+ for SiN+ allowed Sr2Si5âxAlxN8âxOx:0.02Eu2+ a promising candidate as a red phosphor in the white LED applications when xâ¤0.4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 147, March 2014, Pages 173-178
Journal: Journal of Luminescence - Volume 147, March 2014, Pages 173-178
نویسندگان
Ting Wang, Peng Zheng, Xiaolang Liu, Haifei Chen, Liu Bian, Q.L. Liu,