کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7840141 | 1505864 | 2018 | 40 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectroscopy of Nd3+ luminescence centres in Li2B4O7:Nd, LiCaBO3:Nd, and CaB4O7:Nd glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The electron paramagnetic resonance (EPR), optical absorption, luminescence (emission and excitation) spectra as well as luminescence kinetics of the Nd3+ centres in a series of borate glasses with Li2B4O7:Nd, LiCaBO3:Nd, and CaB4O7:Nd compositions containing 0.5 and 1.0â¯mol% Nd2O3 have been investigated and analysed. Using EPR and optical spectroscopy data it was shown that the Nd impurity is incorporated into the network of investigated glasses as Nd3+ (4f3, 4I9/2) ions, exclusively. All observed f - f electronic transitions of the Nd3+ centres in optical absorption and luminescence spectra of the investigated glasses were identified. Local structure of the Nd3+ luminescence centres in the borate glasses network is proposed. Theoretical oscillator strengths (ftheor) and phenomenological intensity parameters (Ω2, Ω4, Ω6) for observed Nd3+ absorption transitions containing 1.0â¯mol% Nd2O3 have been determined using standard Judd-Ofelt theory. The spectroscopic parameters of relevance to laser applications such as the radiative transitions rate (Wr), luminescence branching ratio (β), radiative lifetime (Ïrad), and emission cross-section (Ïem) for Nd3+ centres in the Li2B4O7:Nd, LiCaBO3:Nd, and CaB4O7:Nd glasses have been calculated. Luminescence decay curves of the Nd3+ centres from the 4F3/2 emitting level for all investigated glasses were satisfactory described by single exponential decay. The obtained experimental lifetimes were compared with those calculated and quantum efficiency (η) of the 4F3/2 â 4I11/2 transition for Nd3+ centres in the investigated glasses were estimated. Based on the obtained results it can be concluded that the further efforts should be made to improve the Nd-doped borate glasses parameters relevant for neodymium solid state lasers with LED pumping.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 198, June 2018, Pages 183-192
Journal: Journal of Luminescence - Volume 198, June 2018, Pages 183-192
نویسندگان
B.V. Padlyak, R. Lisiecki, T.B. Padlyak, V.T. Adamiv,