Luminescence spectral studies of Tm³⁺ ions doped Lead Tungsten Tellurite glasses for visible Red and NIR applications

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• 作者：M. Venkateswarlu^a ; Sk. Mahamuda^a ; K. Swapna^a ; A. Srinivasa Rao^a ; ^b ; ^{drsrallam@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; A. Mohan Babu^c ; Suman Shakya^d ; D. Haranath^e ; G. Vijaya Prakash^d
• 关键词：Thulium ; Glasses ; JO parameters ; Optical materials ; Luminescence ; Optical properties
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：175
• 期：Complete
• 页码：225-231
• 全文大小：780 K

文摘

Lead Tungsten Tellurite (LTT) glasses doped with different concentrations of Tm³⁺ ions of composition (60−x) TeO₂+25WO₃+15PbF₂+xTm₂O₃ (Here x=0.1, 0.5, 1.0, 1.5, 2.0, 2.5 mol%) were prepared by using melt quenching technique and characterized through optical absorption, photoluminescence and decay spectral studies to know the feasibility of using these glasses as luminescent devices in visible Red and NIR regions. Judd–Ofelt (J–O) theory has been applied to the optical absorption spectral profiles to calculate the J–O intensity parameters Ω_λ (λ=2, 4 and 6) and consecutively used to evaluate various radiative properties such as radiative transition probability (A_R  ), radiative lifetimes (τ_R${\mathit{\tau }}_{\mathit{R}}$) and branching ratios (β_R${\beta }_{\mathit{R}}$) for the prominent luminescent levels. The luminescence spectra for all the LTT glass samples have two intense peaks in bright red and near Infrared regions at 650 nm (¹G₄→³F₄) and 800 nm (³H₄→³H₆) respectively for which effective band widths (Δλ_P${\mathrm{\Delta }\mathit{\lambda }}_{\mathit{P}}$), experimental branching ratios (β_exp${\mathit{\beta }}_{\mathit{exp}}$) and stimulated emission cross-sections (σ_se${\sigma }_{\mathit{s}\mathit{e}}$) are evaluated. The decay profiles for all the glasses are recorded to measure the quantum efficiency by coupling the radiative with experimental lifetimes. From the measured emission cross-sections, quantum efficiency and CIE chromaticity co-ordinates, it was found that 0.5 mol% of Tm³⁺ ions doped LTT glass is most suitable for generating bright visible Red and NIR lasers to operate at 650 and 800 nm respectively.