کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7839947 1505861 2018 28 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of dopant contents on upconversion luminescence and temperature sensing behavior in Ca3La6Si6O24:Yb3+-Er3+/Ho3+ phosphors
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Effect of dopant contents on upconversion luminescence and temperature sensing behavior in Ca3La6Si6O24:Yb3+-Er3+/Ho3+ phosphors
چکیده انگلیسی
At present, improving the sensitivity is one main object for optical temperature sensing. In this work, a series of Yb3+-Er3+ and Yb3+-Ho3+ doped Ca3La6Si6O24 (CLS) phosphors were designed by solid-state reaction method to develop new rare earth (RE) ions activated upconversion luminescence materials based on thermally coupled and non-thermally coupled levels of Er3+/Ho3+. For the CLS:0.6Yb3+,xEr3+ (0.03 ≤ x ≤ 0.18) and CLS:yYb3+,0.03Er3+ (0.3 ≤ y ≤ 1.2) samples, the relative intensities of Er3+ different emission peaks change with the RE ions concentrations, which was interpreted by the proposed cross-relaxation (CR) processes. For the CLS:0.6Yb3+,mHo3+ (0.03 ≤ m ≤ 0.18) and CLS:nYb3+,0.03Ho3+ (0.3 ≤ n ≤ 1.2) samples, the 5F5-5I8 transition intensity of Ho3+ shows a continuous decrease with increasing Yb3+ or Ho3+ concentrations by normalizing the (5F4,5S2)-5I8 transition of Ho3+, which was explained by the CR between Yb3+ and Ho3+. The temperature dependence of the fluorescence intensity ratio for Er3+ and Ho3+ emissions was discussed in detail. The relative and absolute sensitivities were compared by using thermally coupled and non-thermally coupled levels of Er3+ and Ho3+. The present investigation could be instructive to develop new luminescent materials with high sensitivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 201, September 2018, Pages 217-223
نویسندگان
, ,