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Three-photon upconversion luminescence phenomenon for the green levels in Er3+/Yb3+ codoped cubic nanocrystalline yttria

机译:Er3 + / Yb3 +共掺杂立方纳米晶氧化钇中绿色水平的三光子上转换发光现象

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摘要

In this paper, we observed that in Er3+/Yb3+ codoped nanocrystals (NC), with the decreasing particle size and the increasing Yb3+ concentration, the upconversion luminescence (UCL) of the red emissions of F-4(9/2)-I-4(15/2) gradually increased, while the green emissions of S-4(3/2)/H-2(11/2) gradually diminished under 980 nm diode laser excitation. In NC with lower Yb3+ concentration, both the red and green emissions result from a two-photon excitation. In NC with higher Yb3+ concentration, the red emissions result from a two-photon excitation, while the green emissions dominantly result from a three-photon excitation. A model was provided for explaining the above UCL phenomena. (C) 2004 Elsevier Ltd. All rights reserved.
机译:在本文中,我们观察到在Er3 + / Yb3 +共掺杂纳米晶体(NC)中,随着粒径的减小和Yb3 +浓度的增加,F-4(9/2)-I-的红色发射的上转换发光(UCL)。 4(15/2)逐渐增加,而S-4(3/2)/ H-2(11/2)的绿色发射在980 nm二极管激光激发下逐渐减少。在Yb3 +浓度较低的NC中,红色和绿色发射都是由双光子激发引起的。在具有较高Yb3 +浓度的NC中,红色发射是由两个光子激发引起的,而绿色发射主要是由三光子激发引起的。提供了用于解释上述UCL现象的模型。 (C)2004 Elsevier Ltd.保留所有权利。

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