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首页> 外文期刊>Optical Materials >Persistent luminescence induced by near infra-red photostimulation in chromium-doped zinc gallate for in vivo optical imaging
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Persistent luminescence induced by near infra-red photostimulation in chromium-doped zinc gallate for in vivo optical imaging

机译：铬掺杂的没食子酸锌中近红外光刺激诱导的持久发光，用于体内光学成像

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摘要

The analysis of the optical spectroscopy of the Cr3+ doped spinel was initiated by Prof. Georges Boulon more than twenty years ago. More recently persistent luminescence nanoparticles of Cr doped zinc gallate have found interest for in vivo imaging of small animals. Here we evaluated near infra-red (NIR) excitation (or NIR photostimulation) via photo-transfer mechanism as an additional tool for in vivo optical imaging. Investigation of the persistent luminescence induced by NIR photostimulation is studied after either a primary UV (band-to-band excitation) or visible irradiation (direct Cr 3d-3d excitation). UV or visible pre-excited ZnGa2O4:Cr (ZGO:Cr) nanoparticles are kept active during several days thanks to deep traps (with depths 1 eV -1.2 eV) observed in these samples which can be probed through thermally stimulated luminescence (TSL) technique showing glow curve maximums at 470 K and 530 K upon visible light excitation. These deep traps are stable at room temperature but can be emptied by NIR light photostimulation. Experiments were carried out to study the photostimulation induced trapping-detrapping in the ZGO:Cr phosphor. Photostimulation was also tested in vivo for small animal optical imaging to offer new perspectives and modalities. (C) 2016 Elsevier B.V. All rights reserved.
机译：二十多年前，Georges Boulon教授开始对掺杂Cr3 +的尖晶石的光谱进行分析。最近，Cr掺杂的没食子酸锌的持久发光纳米颗粒已经引起了小动物体内成像的兴趣。在这里，我们通过光传输机制评估了近红外（NIR）激发（或NIR光刺激），作为体内光学成像的另一种工具。在初次UV（带间激发）或可见光照射（直接Cr 3d-3d激发）后，研究了由NIR光刺激诱导的持续发光。紫外线或可见的预激发ZnGa2O4：Cr（ZGO：Cr）纳米颗粒在几天内保持活性，这是由于在这些样品中观察到了深陷阱（深度为1 eV -1.2 eV），可以通过热激发发光（TSL）技术进行探测可见光激发后在470 K和530 K处的辉光曲线最大值。这些深陷阱在室温下稳定，但可以通过近红外光刺激来清空。进行了实验以研究光刺激引起的ZGO：Cr荧光粉中的俘获-去俘获。还对光刺激进行了体内小动物光学成像测试，以提供新的观点和方式。 （C）2016 Elsevier B.V.保留所有权利。

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