کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7907787 1510759 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Luminescent Eu3+ doped Al6Ge2O13 crystalline compounds obtained by the sol gel process for photonics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Luminescent Eu3+ doped Al6Ge2O13 crystalline compounds obtained by the sol gel process for photonics
چکیده انگلیسی
We synthesized pure and Eu3+ doped Al6Ge2O13 samples by an easy and low-cost sol-gel route using the GeO2, Al(NO3)3·9H2O and Eu(NO3)3·6H2O as precursors, tetramethylammonium hydroxide and ethanol as solvents. The Al6Ge2O13 crystalline phase possesses orthorhombic structure and is a potential host for rare earth ions, especially due to high aluminum concentration. Homogeneous and transparent sols and gels were obtained. The samples containing 1 mol% of Eu3+ were heat-treated at 1000 °C to eliminate organic compounds, providing high optical quality and structural purity. All materials were characterized by thermogravimetric and differential thermal analysis, X-ray diffraction, Fourier transform infrared spectroscopy, high resolution transmission electron microscopy, selected area electron diffraction, diffuse reflectance spectra in the ultraviolet-visible-near infrared regions and photoluminescence measurements. High purity of Eu3+ doped Al6Ge2O13 orthorhombic phase and well crystallized grain dimensions of around 100 nm was obtained with high red photoluminescence emission. The decay lifetime of 5D0 level from Eu3+ (the emission at 612 nm) was determined, being between 0.97 and 2.12 ms, and an average quantum efficiency of 54% was determined (considering the average experimental lifetime of 1.77 ms). Moreover, it was calculated and analyzed some parameters of Judd-Ofelt theory applied to Eu3+ emissions from Al6Ge2O13 host. The results show that Eu3+ doped Al6Ge2O13 crystalline compounds have large potential to be used in displays and LED devices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 75, January 2018, Pages 297-303
نویسندگان
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