کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5399898 | 1505909 | 2014 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Temperature-dependent photoluminescence properties of (Ba,Sr)2SiO4:Eu2+ phosphors for white LEDs applications
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
(Ba,Sr)2SiO4: Eu2+ phosphors with various Eu2+ concentrations and Ba/Sr ratios were synthesized by solid-state reactions and their temperature-dependent photoluminescence properties were studied between 30 and 200 °C. Thermal quenching properties of (Ba1âxSrx)2SiO4: Eu2+ phosphors barely depend on Eu2+ concentrations, but exhibit a complex dependence on Ba/Sr ratios. With the increase of the Sr content, the luminescent thermostability is gradually improved for x<0.5 and then becomes worse as x>0.5. Considering changes in Stokes shifts, emission wavelengths and host lattice bandgaps for samples with various Ba/Sr ratios, this anomalous quenching behavior was discussed in terms of the configuration coordinate model and photo-ionization theory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 151, July 2014, Pages 165-169
Journal: Journal of Luminescence - Volume 151, July 2014, Pages 165-169
نویسندگان
Qiyue Shao, Huanyun Lin, Yan Dong, Jianqing Jiang,