Spectroscopy and near infrared upconversion of Er3+ -doped TZNT glasses
Spectroscopy and near infrared upconversion of Er3+ -doped TZNT glasses
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DOI：
10.1016/j.jlumin.2015.08.035
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发表时间：
2016-01-01
影响因子：
3.6
通讯作者：
Jayasankar, C. K.
中科院分区：
文献类型：
--
作者：
Krishnaiah, K. Venkata;Marques-Hueso, J.;Jayasankar, C. K.
本文报道了掺Er~(3+)的TeO_2-ZnO-Nb_2O_5-TiO(TZNT)氧化物玻璃的近红外上转换(UC)和光谱性质。用贾德-欧菲尔理论研究了用于推导荧光能级辐射性质的强度参数(欧米伽(λ)，λ=2，4和6)。用变角椭圆偏振光谱仪测定了不同玻璃的折射率、色散和阿贝数。在980 nm激发下，研究了Er~(3+)浓度在较宽的范围内(0.01-3.0mol%)的近红外发射谱和半峰全宽。另一方面，在1523 nm处激发得到了近红外发光，在所研究的范围内随着Er3+离子浓度的增加，近红外发光强度增加。I-4(13/2)能级的衰变曲线在所有不同浓度下均呈单指数性质。随着Er3+离子浓度的增加，I-4(13/2)能级的寿命在最初增加(3.65-3.73ms)后减小(3.73-1.20ms)。TZNT样品在1.0微米处表现出宽带UC发射，与硅的禁带宽度相匹配。这表明，所调查的玻璃可以在光子学中找到应用，例如非线性光学和光伏的。(C)2015爱思唯尔公司版权所有。
In this paper we report on the near infrared (NIR) upconversion (UC) and spectroscopic properties of erbium (Er3+)-doped TeO2-ZnO-Nb2O5-TiO2 (TZNT) oxide glasses. Judd-Ofelt theory has been applied to investigate the intensity parameters (Omega(lambda), lambda=2, 4 and 6) which are used to derive radiative properties of the fluorescent levels. The different glasses present high refractive indices, low dispersion and Abbe numbers, as determined by variable angle spectroscopic ellipsometry. Under 980 nm excitation, the NIR emission profile and full width at half maximum have been studied in a broad range of Er3+ concentrations (0.01-3.0 mol%). On the other side, NIR UC has been obtained by exciting at 1523 nm, showing an increase of the intensity with Er3+ ion density in the studied range. The decay curves of the I-4(13/2) level exhibit single exponential nature for all the different concentrations. The lifetime of the I-4(13/2) level has been found to decrease (3.73-1.20 ms) after an initial increase (3.65-3.73 ms) with increasing of Er3+ ion concentration. The TZNT samples show broadband UC emission at 1.0 mu m, which match with the band gap of silicon. This reveals that the investigated glasses could find application in photonics, for example non-linear optics and photovoltaic's. (C) 2015 Elsevier B.V. All rights reserved.