Abstract Herein, we report the detailed structural and spectroscopic analysis of singly and doubly doped Pr3+and Sm3+ions in yttrium aluminium garnet (Y3Al5O12, YAG) host. The formation of YAG nanophosphor is confirmed by XRD patterns and TEM images revealing crystalline size in the range of 40–50 nm. The absorption peaks of the doubly doped sample are the conflation of the absorption due to both the Pr3+ and Sm3+ ions. The laser excitations by 405 and 450 nm yield sharp and intense emissions in the orange-red region due to the combinatorial emission of both the doped species. Results were estimated from the powder sample as well as homo and hetro-layered structures. The emission intensity was found to improve with the number of layers. The intensity of characteristic emission peaks of Sm3+ ions was found to reduce in presence of Pr3+ ions. XPS analysis reveals a change in valance state of Pr3+ to Pr4+ and Sm3+ to Sm2+ ion, which is reported to be responsible for the emission intensity reduction. The dual-beam excitation of Pr and Sm doped layer yield bright emission of both the species although the 0.8Sm@0.1Pr layers yields a combinatorial emission with modified intensity. The time-resolved emission spectroscopy indicates the weak interaction between the doped species. Moreover, the codoped nanophosphors demonstrate modified color perception in comparison to the singly doped nanophosphor, as revealed by CIE coordinates calculation under different excitations.

中文翻译：

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双掺杂 YAG:Pr/Sm 纳米磷光体和颜色调制的明亮红色发射

摘要 在此，我们报告了钇铝石榴石 (Y3Al5O12, YAG) 主体中单掺杂和双掺杂 Pr3+ 和 Sm3+ 离子的详细结构和光谱分析。YAG 纳米磷光体的形成通过 XRD 图案和 TEM 图像证实，显示晶体尺寸在 40-50 nm 范围内。双掺杂样品的吸收峰是由 Pr3+ 和 Sm3+ 离子引起的吸收的合并。由于两种掺杂物质的组合发射，405 和 450 nm 的激光激发在橙红色区域产生尖锐而强烈的发射。结果是从粉末样品以及同质和异质层状结构中估计出来的。发现发射强度随着层数的增加而提高。发现 Sm3+ 离子的特征发射峰强度在 Pr3+ 离子存在时降低。XPS 分析揭示了 Pr3+ 到 Pr4+ 和 Sm3+ 到 Sm2+ 离子的价态变化，据报道这是发射强度降低的原因。Pr 和 Sm 掺杂层的双光束激发产生两种物质的明亮发射，尽管 0.8Sm@0.1Pr 层产生具有改变强度的组合发射。时间分辨发射光谱表明掺杂物质之间的相互作用较弱。此外，如在不同激发下的 CIE 坐标计算所揭示的那样，与单掺杂的纳米磷光体相比，共掺杂的纳米磷光体表现出改进的颜色感知。Pr 和 Sm 掺杂层的双光束激发产生两种物质的明亮发射，尽管 0.8Sm@0.1Pr 层产生具有改变强度的组合发射。时间分辨发射光谱表明掺杂物质之间的相互作用较弱。此外，如在不同激发下的 CIE 坐标计算所揭示的那样，与单掺杂的纳米磷光体相比，共掺杂的纳米磷光体表现出改进的颜色感知。Pr 和 Sm 掺杂层的双光束激发产生两种物质的明亮发射，尽管 0.8Sm@0.1Pr 层产生具有改变强度的组合发射。时间分辨发射光谱表明掺杂物质之间的相互作用较弱。此外，如在不同激发下的 CIE 坐标计算所揭示的那样，与单掺杂的纳米磷光体相比，共掺杂的纳米磷光体表现出改进的颜色感知。