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Strengthening the non-pre-irradiated near-infrared mechanoluminescence of CaZnOS:Nd3+ by Mn2+ coactivation for biomechanical imaging
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2023-02-02 , DOI: 10.1039/d3tc00152k
Jianxiong Lei, Wei Li, Yiqian Tang, Yiyu Cai, Shanshan Wang, Kunpeng Dou, Jun-Cheng Zhang

The development of lanthanide-activated CaZnOS mechanoluminescent (ML) phosphors that can produce non-pre-irradiated mechanoluminescence (ML) in the near-infrared (NIR) region opens a new avenue for in vivo and in situ biomechanical imaging. However, the progress in obtaining NIR ML images with a high signal-to-background ratio (SBR) has been constrained by the difficulties in achieving intense NIR ML. In this paper, we report a Mn2+-coactivation induced dual sensitization strategy that combines host sensitization with dopant sensitization to enhance the NIR ML of CaZnOS:Nd3+. Systematic characterization of the CaZnOS:Nd3+,Mn2+ series reveals that the enhanced NIR ML arises from the energy transfer from the host to Mn2+ to Nd3+, which involves the Mn2+-doping strengthened host excitation and the resonant energy transfer from Mn2+ to Nd3+. We demonstrate that the developed CaZnOS:Nd3+,Mn2+ phosphor greatly enhances the transient intensity of the NIR ML response and the SBR value of NIR ML images through a series of NIR ML penetration experiments on chicken breast and human cheek. In particular, the transient NIR ML response to dental occlusion is improved by 368%, while the SBR value of NIR ML penetrating the human cheek is improved from 1.25 to 2.1. Our results are expected to provide new insights into the development and optimization of non-pre-irradiated NIR ML phosphors, and further to advance the applications of NIR ML phosphors with an intense emission for high SBR biomechanical imaging.

中文翻译:

通过 Mn2+ 共激活增强 CaZnOS:Nd3+ 的非预辐照近红外机械发光,用于生物力学成像

可以在近红外 (NIR) 区域产生非预辐照机械发光 (ML) 的镧系元素激活的 CaZnOS 机械发光 (ML) 荧光粉的开发为体内和原位生物力学成像开辟了一条途径。然而,在获得具有高信号背景比 (SBR) 的 NIR ML 图像方面的进展一直受到难以实现强烈 NIR ML 的限制。在本文中,我们报告了一种 Mn 2+共激活诱导的双重敏化策略,该策略将主体敏化与掺杂剂敏化相结合,以增强 CaZnOS:Nd 3+的 NIR ML 。CaZnOS:Nd 3+ ,Mn 2+的系统表征系列表明,增强的NIR ML源于从主体到Mn 2+到Nd 3+的能量转移,这涉及Mn 2+掺杂增强的主体激发和从Mn 2+到Nd 3+的共振能量转移。我们证明了开发的 CaZnOS:Nd 3+ ,Mn 2+通过对鸡胸肉和人脸颊的一系列 NIR ML 渗透实验,荧光粉极大地增强了 NIR ML 响应的瞬态强度和 NIR ML 图像的 SBR 值。特别是,牙齿咬合的瞬态 NIR ML 响应提高了 368%,而 NIR ML 穿透人脸颊的 SBR 值从 1.25 提高到 2.1。我们的结果有望为非预辐照 NIR ML 荧光粉的开发和优化提供新的见解,并进一步推进具有强发射的 NIR ML 荧光粉在高 SBR 生物力学成像中的应用。
更新日期:2023-02-02
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