کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11024407 | 1701157 | 2019 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The site occupancy and optical investigations on a novel Li2CaSi2N4: Eu2+ orange-red phosphor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Eu2+ activated lithium-containing nitridosilicates attract great attention in the field of phosphors research due to their outstanding luminescent performance. Herein, a nitridolithosilicate Li2CaSi2N4:Eu2+ orange-red phosphor was successfully synthesized by solid-state reaction. Upon the 400â¯nm excitation, the phosphor exhibits a slightly wide and asymmetric emission profile. Meanwhile, the emission band broadens with the increase of Eu2+ ions concentration. It may result from Eu2+ occupying different positions of Ca2+ in the host, which can give rise to different degrees of nephelauxetic effect and crystal field splitting. Considering the effect of the centroid shift (εc) and crystal field splitting (εcfs), the sources of two luminescence centers are confirmed by calculating the total shift (D(A)) of the 4f5d level of Eu2+ in a host. In addition, the temperature dependence luminescent properties of Li2CaSi2N4:Eu2+ are investigated as well and the thermal-sensitizing mechanism is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 161, February 2019, Pages 324-330
Journal: Dyes and Pigments - Volume 161, February 2019, Pages 324-330
نویسندگان
Quansheng Wu, Jiangcong Zhou,