Spectroscopic investigations of OH-influence on near-infrared fluorescence quenching of Yb3+/Tm3+ co-doped sodium-metaphosphate glasses
Spectroscopic investigations of OH-influence on near-infrared fluorescence quenching of Yb3+/Tm3+ co-doped sodium-metaphosphate glasses
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DOI：
10.1016/j.jlumin.2007.11.028
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发表时间：
2008-05
影响因子：
3.6
通讯作者：
I. A. Terra;A. S. Camargo;M. C. Terrile;L. Nunes
中科院分区：
文献类型：
--
作者：
I. A. Terra;A. S. Camargo;M. C. Terrile;L. Nunes
研究了在空气和氮气气氛中制备的两组Yb{sup3+}和Tm{sup3+}共掺偏磷酸钠玻璃的能量传递过程。利用Foerster、Dexter和Miyakawa理论模型计算了能量传递参数。离子-离子能量传递过程主要是Yb{sup3+}离子之间的能量迁移，Yb{sup3+}和Tm{sup3+}离子之间的交叉弛豫，以及与OH{sup-}自由基的相互作用。结果表明，Yb的Tm能量转移有利于1.8m的发射，当Tm的掺杂浓度达到2%时，没有浓度猝灭的迹象。不出所料，在氮气气氛下制备的样品比在空气中制备的样品具有更高的荧光量子效率，这一特征在近红外区尤其明显，在那里与OH{sup-}自由基的相互作用更加明显。
Energy transfer processes were studied in two sets of Yb{sup 3+} and Tm{sup 3+} co-doped sodium-metaphosphate glasses, prepared in air and nitrogen atmospheres. Using Foerster, Dexter, and Miyakawa theoretical models, the energy transfer parameters were calculated. The main ion-ion energy transfer processes analyzed were energy migration among Yb{sup 3+} ions, cross-relaxations between Yb{sup 3+} and Tm{sup 3+} ions, and interactions with OH{sup -} radicals. The results indicated that Yb{yields}Tm energy transfer favors 1.8 {mu}m emissions, and there is no evidence of concentration quenching up to 2% Tm{sub 2}O{sub 3} doping. As expected, samples prepared in nitrogen atmosphere present higher fluorescence quantum efficiency than those prepared in air, and this feature is specially noted in the near-infrared region, where the interaction with the OH{sup -} radicals is more pronounced.