کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7907902 | 1510760 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Controlled morphology and improved photoluminescence of red emitting K2LiAlF6:Mn4+ nano-phosphor by co-doping with alkali metal ions
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Trace alkali metal ions doped elpasolite K2LiAlF6:X+, Mn4+ (XÂ =Â Li, Na, K) was studied as a red phosphor for white light emitting diodes (WLEDs). It exhibited red emission consisted of a series of narrow bands in the spectral range from 610 to 650Â nm. The excitation bands were mainly centered at 360Â nm and 465Â nm, which matches well with emission of the UV and blue LED chips. The energy levels of Mn4+ in K2LiAlF6 were calculated using the exchange charge model of crystal field. The effects of trace alkali metal ions (Li+, Na+, K+) doping on the morphology and photoluminescence properties were investigated in detail. The emission intensity of K2LiAlF6:0.5 %K+, 3 %Mn4+ was enhanced obviously, which is 25 times higher than that one of the samples without alkali metal ions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 74, December 2017, Pages 52-57
Journal: Optical Materials - Volume 74, December 2017, Pages 52-57
نویسندگان
Yiwen Zhu, Yong Liu, Mikhail G. Brik, Lin Huang, Tongtong Xuan, Jing Wang,