Identifying Near‐Infrared Persistent Luminescence in Cr3+‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature,Advanced Optical Materials

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Identifying Near‐Infrared Persistent Luminescence in Cr3+‐Doped Magnesium Gallogermanates Featuring Afterglow Emission at Extremely Low Temperature
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-12-20 , DOI: 10.1002/adom.201901848
Jiaren Du _{1,

2} , Dirk Poelman _{1,

2}

Affiliation

Room‐temperature persistent phosphors emitting in a wide spectral range are extensively explored owing to their commercial interest in applications such as night‐vision signs and medical imaging. However, phosphors featuring long‐lasting near‐infrared emission at extremely low temperature are barely reported so far. Herein, a design of trivalent chromium‐activated magnesium gallogermanates (Mg₁₊_xGa₂₋₂_xGe_xO₄:Cr³⁺) is demonstrated that exhibit strong near‐infrared afterglow emission at low temperature, e.g., −80 °C. Notably, this new persistent phosphor can be efficiently activated even at these low temperatures. A combination of experimental characterizations together with simulations has identified its novel low‐temperature persistent luminescence and good capacity of stabilizing a large number of very shallow traps. The finding of this low‐temperature near‐infrared afterglow property opens up a new frontier for exploring persistent phosphors and provides an opportunity for novel applications at extreme conditions, such as cryopreservation of biological samples.

中文翻译：

识别具有极低余辉发射特性的Cr3 +掺杂的镁Gallogermantes中的近红外持久发光

由于其在夜视标志和医学成像等应用中的商业兴趣，因此广泛探索了在宽光谱范围内发射的室温持久性磷光体。但是，到目前为止，几乎没有报道过在极低的温度下具有长效近红外发射的磷光体。本文设计的是三价铬活化的高锗酸镁（Mg ₁₊_x Ga ₂₋₂_x Ge _x O ₄：Cr ³⁺）被证明在低温（例如-80°C）下表现出强烈的近红外余辉发射。值得注意的是，即使在这样的低温下，这种新型的持久性磷光体也可以被有效地活化。实验特征与模拟相结合已经确定了其新颖的低温持续发光和良好的稳定大量非常浅的陷阱的能力。这种低温近红外余辉特性的发现为探索持久性磷光体开辟了新的领域，并为极端条件下的新应用提供了机会，例如生物样品的冷冻保存。

更新日期：2020-03-20

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