Abstract Up to now, most of the emisison wavelengths of the reported scintillators are located in ultra-violet (UV) or visible range. Herein, to further expand the X-ray excited fluorescence emission spectrum, an active core/dual-shell nanocrystal (NC) architecture is used to actualize near-infrared scintillation. Specifically, under the X-ray excitation, near-infrared emission from Nd3+ ions at ~1064 and Yb3+ ions at 980 nm are achieved. The active outer shell with the incorporation of Ce3+ sensitizer ions benefited the enhancement of X-ray excited NIR fluorescence emission intensity owing to the enhanced energy transfer efficiency from Ce3+ to Nd3+ or Yb3+ emission centers. The present studied near-infrared NC scintillator have deeper penetration depth than that of UV and visible, which might be useful for X-ray imaging with improved sensitivity.

中文翻译：

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基于核/双壳氟化物纳米晶的近红外闪烁

摘要 目前，已报道的闪烁体的大部分发射波长都位于紫外线（UV）或可见光范围内。在此，为了进一步扩展 X 射线激发的荧光发射光谱，使用活性核/双壳纳米晶体 (NC) 结构来实现近红外闪烁。具体而言，在 X 射线激发下，Nd3+ 离子在~1064 处和 Yb3+ 离子处发射近红外光为 980 nm。由于从 Ce3+ 到 Nd3+ 或 Yb3+ 发射中心的能量转移效率提高，掺入 Ce3+ 敏化剂离子的活性外壳有利于增强 X 射线激发的 NIR 荧光发射强度。目前研究的近红外 NC 闪烁体具有比紫外和可见光更深的穿透深度，这可能有助于提高灵敏度的 X 射线成像。