José A. Jiménez*, Vinod Hedge, C. S. Dwaraka Viswanath and Richard Amesimenu,
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Following refractive index, density, and X-ray diffraction characterizations, the glasses were studied comprehensively through Raman spectroscopy, X-ray photoelectron spectroscopy, dilatometry, optical absorption, and photoluminescence (PL) spectroscopy. The thorough investigation and data analyses shed light on the Dy<sup>3+</sup>-driven structural and thermal properties reported here for the first time. The thermal expansion behavior was put in context with the reported data for other lanthanides and analyzed in the framework of the high ionic field strengths, leading to tighter glass networks. Further, a detailed analysis of the absorption, PL, and emission decay curves was carried out, providing insights into the origin of the optical behavior. Supported is the hypothesis that the cross-relaxation channels between Dy<sup>3+</sup> ions taking place at low concentrations are responsible for the decrease in the decay times while the PL attractive for lighting applications still improves. 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引用次数: 0
摘要
掺杂镝的玻璃在发光器件中的应用备受关注,但人们对 Dy3+ 离子对玻璃特性的全部影响还不完全了解。在这项研究中,通过熔融法制备了标称成分为 50P2O5-(50-x)BaO-xDy2O3(0 ≤ x ≤ 4.0 mol %)的磷酸盐玻璃,并评估了 Dy3+ 离子对玻璃物理、结构、热机械和光学特性的影响。在对玻璃进行折射率、密度和 X 射线衍射表征后,又通过拉曼光谱、X 射线光电子能谱、膨胀率、光吸收和光致发光 (PL) 光谱对玻璃进行了全面研究。深入的研究和数据分析首次揭示了 Dy3+ 驱动的结构和热特性。热膨胀行为与其他镧系元素的报告数据进行了对比,并在高离子场强的框架下进行了分析,从而导致了更紧密的玻璃网络。此外,还对吸收、聚光和发射衰变曲线进行了详细分析,从而深入了解了光学行为的起源。有一种假设得到了支持,即在低浓度下,Dy3+ 离子之间的交叉舒张通道是衰减时间缩短的原因,而对照明应用仍有吸引力的聚光效应却在提高。相反,高浓度的 Dy3+ 会通过电偶极子-偶极子相互作用促进发射淬灭,这可能包含了 Dy3+-Dy3+ 平均距离短于 ∼15 Å 时的共振激发迁移途径。
Insights into the Structural, Thermal/Dilatometric, and Optical Properties of Dy3+-Doped Phosphate Glasses for Lighting Applications
Dysprosium-doped glasses are of interest for applications in light-emitting devices, yet the full range of effects of Dy3+ ions on glass properties is not fully understood. In this work, phosphate glasses with 50P2O5-(50 – x)BaO-xDy2O3 (0 ≤ x ≤ 4.0 mol %) nominal compositions were prepared by melting and the impact of Dy3+ ions on glass physical, structural, thermo-mechanical, and optical properties was evaluated. Following refractive index, density, and X-ray diffraction characterizations, the glasses were studied comprehensively through Raman spectroscopy, X-ray photoelectron spectroscopy, dilatometry, optical absorption, and photoluminescence (PL) spectroscopy. The thorough investigation and data analyses shed light on the Dy3+-driven structural and thermal properties reported here for the first time. The thermal expansion behavior was put in context with the reported data for other lanthanides and analyzed in the framework of the high ionic field strengths, leading to tighter glass networks. Further, a detailed analysis of the absorption, PL, and emission decay curves was carried out, providing insights into the origin of the optical behavior. Supported is the hypothesis that the cross-relaxation channels between Dy3+ ions taking place at low concentrations are responsible for the decrease in the decay times while the PL attractive for lighting applications still improves. Conversely, high Dy3+ concentrations facilitate the emission quenching proceeding via an electric dipole–dipole interaction likely incorporating the resonant excitation migration pathway for Dy3+–Dy3+ mean distances shorter than ∼15 Å.
期刊介绍:
ACS Physical Chemistry Au is an open access journal which publishes original fundamental and applied research on all aspects of physical chemistry. The journal publishes new and original experimental computational and theoretical research of interest to physical chemists biophysical chemists chemical physicists physicists material scientists and engineers. An essential criterion for acceptance is that the manuscript provides new physical insight or develops new tools and methods of general interest. Some major topical areas include:Molecules Clusters and Aerosols; Biophysics Biomaterials Liquids and Soft Matter; Energy Materials and Catalysis