کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7839757 1505860 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molybdenum substitution induced luminescence enhancement in Gd2W1-xMoxO6:Eu3+ phosphors for near ultraviolet based solid-state lighting
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Molybdenum substitution induced luminescence enhancement in Gd2W1-xMoxO6:Eu3+ phosphors for near ultraviolet based solid-state lighting
چکیده انگلیسی
A series of the Eu3+-activated Gd2W1-xMoxO6 phosphors were synthesized by a high-temperature solid-state reaction method. The phase composition, ultraviolet-visible diffuse reflectance spectra, photoluminescence and decay properties of the phosphors were investigated. Through adjusting the Mo6+ ion concentration, the excitation band of the studied sample was gradually shifted to longer wavelength. Under 376 nm excitation, the strong red emission at 610 nm and weak yellow emission centered at 591 nm were detected, indicating that Eu3+ occupies non-inversion symmetry sites in the host lattices. With elevating the dopant concentration, the emission intensity of synthesized products was greatly enhanced and achieved its optimum value when x = 0.95 which was 2.33 times higher than that of the Gd2WO6:Eu3+ compounds. The quantum efficiency of resultant samples was as high as 76.1%. Moreover, the Judd-Oflet theory was used to study the local structure environment behaviors of the Eu3+ ions in the host lattices. Finally, a red LED device, which consisted of a near-ultraviolet chip and prepared Gd2W0.05Mo0.95O6:Eu3+ phosphors, was successfully fabricated. These results confirmed that the Eu3+-doped Gd2W1-xMoxO6 phosphors have potential value as the red component for WLEDs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 202, October 2018, Pages 97-106
نویسندگان
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