Visible red, NIR and Mid-IR emission studies of Ho³⁺ doped Zinc Alumino Bismuth Borate glasses

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• 作者：Sk. Mahamuda ; K. Swapna ; P. Packiyaraj ; A. Srinivasa Rao ; G. Vijaya Prakash
• 关键词：Glasses ; Holmium ; JO parameters ; Radiative properties ; Emission cross-section ; Optical gain
• 刊名：Optical Materials
• 出版年：December, 2013
• 年：2013
• 卷：36
• 期：2
• 页码：362-371
• 全文大小：1046 K

文摘

Zinc Alumino Bismuth Borate (ZnAlBiB) glasses doped with different concentrations of Holmium were prepared by conventional melt quenching technique. The glassy nature of these glasses has been confirmed through the XRD spectral measurements. The FTIR spectra recorded for undoped glass revealed the information related to the functional groups involved in the host glass. Optical absorption, excitation and photoluminescence spectra of these glasses have been recorded at room temperature. The Judd-Ofelt theory has been applied successfully to characterize the absorption spectra of the ZnAlBiB glasses. From this theory various radiative properties such as radiative transition probability (A_R), radiative lifetimes (蟿_R), branching ratios (尾_R) and spectroscopic quality factor (蠂) for the prominent emission levels ⁵F₅ 鈫?#xA0;⁵I₇, ⁵F₅ 鈫?#xA0;⁵I₈ and ⁵I₇ 鈫?#xA0;⁵I₈ have been evaluated. The photoluminescence spectra revealed the quenching of luminescence intensity beyond 1.0 mol% of Ho³⁺ ion concentration in ZnAlBiB glasses. To investigate the lasing potentiality of ⁵F₅ 鈫?#xA0;⁵I₇, ⁵F₅ 鈫?#xA0;⁵I₈ and ⁵I₇ 鈫?#xA0;⁵I₈ transitions, the effective band width (螖位_p) and the stimulated emission cross-section (蟽_se) were determined. The CIE chromaticity co-ordinates were also evaluated from the emission spectra for all the glasses to understand the suitability of these materials for visible red laser emission in principle.