Pr3+ doped lead tungsten tellurite glasses for visible red lasers
Pr3+ doped lead tungsten tellurite glasses for visible red lasers
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DOI：
10.1016/j.ceramint.2013.11.084
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发表时间：
2014-05
影响因子：
5.2
通讯作者：
M. Venkateswarlu;M. Prasad;K. Swapna;Sk. Mahamuda;A. S. Rao;A. M. Babu;D. Haranath
中科院分区：
文献类型：
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作者：
M. Venkateswarlu;M. Prasad;K. Swapna;Sk. Mahamuda;A. S. Rao;A. M. Babu;D. Haranath
采用熔体淬冷法制备了Pr 3+（0.01，0.1，0.5，1.0和1.5mol%）掺杂的铅钨碲酸盐（LTT）玻璃。用X射线衍射、光吸收光谱和光致发光光谱对玻璃进行了表征。通过XRD测量证实了LTT基质玻璃的玻璃性质。从这些玻璃的各个吸收带的强度测量值出发，用标准J-O理论和修正的J-O理论计算了三个唯象的Judd-Ofelt（J-O）强度参数（Ω2，Ω 4和Ω6）。用修正的J-O理论计算得到的J-O参数表征了玻璃的吸收光谱和发光光谱。从该理论出发，计算了这些玻璃中Pr 3+荧光能级的辐射跃迁几率（AR）、总跃迁几率（AT）、分支比（βR）和辐射寿命（τR）等辐射性质。发射光谱在可见光区有5个发射带，并计算了有效带宽（ΔλP）和发射截面（σse）。在所有的5个发射跃迁中，3 P0 → 3F 2跃迁强度最大，位于红区的福尔斯。所有这些玻璃的可见光发射光谱，受激发射截面和分支比的观察表明，使用这些玻璃作为红色区域的激光器的可行性。还从发射光谱评估CIE色度坐标，以了解这些材料对于红色发射的适用性。从吸收，发射和CIE色度测量，发现1摩尔%的Pr 3+离子浓度是相当适合的LTT玻璃，从这些玻璃开发明亮的红色激光。
Lead tungsten tellurite (LTT) glasses doped with Pr3+(0.01, 0.1, 0.5, 1.0 and 1.5 mol%) ions were prepared by the conventional melt quenching technique. The glasses were characterized by X-ray diffraction, optical absorption and photoluminescence spectra. The glassy nature of LTT host glass has been confirmed through XRD measurements. From the measured intensities of various absorption bands of these glasses, the three phenomenological Judd–Ofelt (J–O) intensity parameters (Ω2,Ω4andΩ6) have been evaluated by using the standard as well as modified J–O theory. The J–O parameters measured from the modified J–O theory were used to characterize the absorption and luminescence spectra of these glasses. From this theory, various radiative properties like radiative transition probability (AR), total transition probability (AT), branching ratio (βR) and radiative lifetime (τR) have been evaluated for the fluorescent levels of Pr3+in these glasses. The emission spectra show five emission bands in visible region for which the effective band widths (ΔλP) and emission cross-sections (σse) have been evaluated. Among all the five emission transitions, a transition3P0→3F2is more intense and falls in red region. The visible emission spectra, stimulated emission cross-sections and branching ratios observed for all these glasses suggest the feasibility of using these glasses as lasers in red region. The CIE chromaticity co-ordinates were also evaluated from the emission spectra to understand the suitability of these materials for red emission. From the absorption, emission and CIE chromaticity measurements, it was found that 1 mol% of Pr3+ion concentration is quite suitable for LTT glasses to develop bright red lasers from these glasses.