Significant enhancement of visible up-conversion emissions of Y2O2S:Er3+ phosphors by Mn2+ sensitizing under 1550 nm excitation
Significant enhancement of visible up-conversion emissions of Y2O2S:Er3+ phosphors by Mn2+ sensitizing under 1550 nm excitation
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DOI：
10.1039/c3ra47645f
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发表时间：
2014-04
期刊：
影响因子：
3.9
通讯作者：
S. Yuan;Huidan Zeng;Xu Wu;Zhao Liu;Jing Ren;Guorong Chen;Zhaofeng Wang;Luyi Sun
中科院分区：
文献类型：
--
作者：
S. Yuan;Huidan Zeng;Xu Wu;Zhao Liu;Jing Ren;Guorong Chen;Zhaofeng Wang;Luyi Sun
本文报道了一种通过高温固相反应方法制备的 Y2O2S:Er3+ 荧光粉中 Mn2+ 敏化的 Er3+ 的新型上转换 (UC) 发射途径。该方法通过 1550 nm 激光二极管激发显着增强了可见光上转换发射。通过共掺杂 Mn2+，Er3+ 的 4F9/2 → 4I15/2 (670 nm)、4S3/2 → 4I15/2 (547 nm)、2H11/2 → 4I15/2 (528 nm) 跃迁的可见光（红色和绿色）UC 发射强度比 Mn2+ 高 2 至 3 倍。 不含 Mn2+ 的一种。随着Mn2+浓度的增加，可见光UC发射强度先增强后减弱。荧光粉粉末结晶良好，呈六边形，平均尺寸约为。 2微米。根据发光光谱、能量匹配条件和三光子过程对激发功率的依赖性的结果，提出了一种可能的UC机制。所提出的敏化路线可能会为稀土离子掺杂磷光体的高强度UC发射迈出有希望的一步。
A novel up-conversion (UC) emission route of Er3+ by Mn2+ sensitizing in a Y2O2S:Er3+ phosphor prepared via a high-temperature solid-state reaction method is reported here. This methodology resulted in a significant enhancement of visible up-conversion emission by 1550 nm laser diode excitation. By co-doping Mn2+, the visible (red and green) UC emission intensity, which is assigned to the transitions of 4F9/2 → 4I15/2 (670 nm), 4S3/2 → 4I15/2 (547 nm), 2H11/2 → 4I15/2 (528 nm) of Er3+, was 2 to 3 times higher than that of the Mn2+-free one. As the concentration of Mn2+ was increased, the visible UC emission intensity was enhanced and then reduced. The phosphor powders were well crystallized in a hexagonal shape with an average size of ca. 2 μm. Based on the results of the luminescence spectra, energy matching conditions and three-photon process dependence on excitation power, a possible UC mechanism is proposed. The proposed sensitizing route may lead to a promising step towards high-intensity UC emissions of rare-earth ion doped phosphors.