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首页> 外文期刊>Physica, B. Condensed Matter >Luminescence and laser transition studies of Dy3+:K-Mg-Al fluorophosphate glasses
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Luminescence and laser transition studies of Dy3+:K-Mg-Al fluorophosphate glasses

机译：Dy3 +：K-Mg-Al氟磷酸盐玻璃的发光和激光跃迁研究

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摘要

Dysprosium ion doped fluorophosphate glasses with compositions of PKMAFDy: (56-x/2) P2O5+17K(2)O+8Al(2)O(3)+(15-x/2)MgO+4AlF(3)+xDy(2)O(3) (x = 0.01, 0.05, 0.1, 1.0 and 2.0 mol%) have been prepared by melt quenching technique and are characterized by optical absorption, emission spectra and fluorescence lifetime measurements. The observed bands in the absorption spectrum are analysed by using free-ion Hamiltonian (H-FI) model. The Judd-Ofelt (JO) analysis has been performed and the intensity parameters (Omega(lambda), lambda = 2, 4, 6) have been evaluated that are used to predict radiative properties. From emission spectra, the effective bandwidth (Delta lambda(eff)) and the stimulated emission cross-section (sigma(lambda(p))) were evaluated. The fluorescence decay from the F-4(9/2) level of Dy3+ ions have been measured by monitoring the intense F-4(9/2) -> H-6(13/2) transition (573 nm). The lifetimes (tau) are found to decrease with increasing concentration due to concentration quenching. The decay curves are single exponential for lower concentrations and gradually changes to non-exponential for higher concentrations. The non-exponential decay curves are well fitted to the Inokuti-Hirayama (IH) model for S = 6 which indicates that the energy transfer between the donor and acceptor is of dipole-dipole type. The systematic analysis on decay measurements reveals that the energy transfer mechanism strongly depends on concentration as well as glass composition.
机译：掺MA离子的氟磷酸盐玻璃，其PKMAFDy成分为：（56-x / 2）P2O5 + 17K（2）O + 8Al（2）O（3）+（15-x / 2）MgO + 4AlF（3）+ xDy（ 2）O（3）（x = 0.01、0.05、0.1、1.0和2.0 mol％）已通过熔融淬火技术制备，并通过光学吸收，发射光谱和荧光寿命测量来表征。使用自由离子哈密顿量（H-FI）模型分析吸收光谱中观察到的谱带。已经进行了Judd-Ofelt（JO）分析，并评估了用于预测辐射特性的强度参数（Ω，λ= 2、4、6）。根据发射光谱，评估了有效带宽（Δlambda（eff））和受激发射截面（sigma（lambda（p）））。通过监测强烈的F-4（9/2）-> H-6（13/2）跃迁（573 nm），可以测量Dy3 +离子从F-4（9/2）水平发出的荧光衰减。发现由于浓度猝灭，寿命（tau）随着浓度的增加而降低。对于较低的浓度，衰减曲线为单指数，对于较高的浓度，衰减曲线逐渐变为非指数。对于S = 6，非指数衰减曲线非常适合Inokuti-Hirayama（IH）模型，这表明供体和受体之间的能量转移是偶极-偶极类型。对衰变测量的系统分析表明，能量转移机制在很大程度上取决于浓度以及玻璃成分。

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