Ratiometric temperature imaging using environment-insensitive luminescence of Mn-doped core-shell nanocrystals.
Ratiometric temperature imaging using environment-insensitive luminescence of Mn-doped core-shell nanocrystals.
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DOI：
10.1039/c3nr00290j
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发表时间：
2013-06-07
期刊：
影响因子：
6.7
通讯作者：
Son DH
中科院分区：
文献类型：
--
作者：
Park Y;Koo C;Chen HY;Han A;Son DH
我们报道了一种基于Mn掺杂CdS/ZnS纳米晶体（NCs） Mn发光的比例温度成像方法，该方法具有可控掺杂位置，旨在表现出对光谱线形状的强烈温度依赖性，同时对周围化学环境不敏感。采用Mn掺杂的CdS/ZnS核/壳纳米管对Mn发光光谱进行了比例测温，该纳米管在Mn位点具有较大的局部晶格应变，导致带宽和峰位对温度的依赖性增强。Mn的发光谱线形状对周围介质的极性、相和pH的变化以及NCs的聚集具有很强的鲁棒性，在化学非均质环境下的温度成像中具有很大的潜力。温度灵敏度（ΔIR/IR = 0.5%/K在293 K， IR =强度比在两个不同的波长）是高度线性的温度范围从低温到高于环境温度。我们利用环境不敏感的发光特性，通过对简单自旋涂层形成的NC薄膜的发光成像，展示了一种显示>200 K温度变化的回旋冷却装置的表面温度成像。
We report a ratiometric temperature imaging method based on Mn luminescence from Mn-doped CdS/ZnS nanocrystals (NCs) with controlled doping location, which is designed to exhibit strong temperature dependence of the spectral lineshape while being insensitive to the surrounding chemical environment. Ratiometric thermometry on Mn luminescence spectrum was performed by using Mn-doped CdS/ZnS core/shell NCs that have a large local lattice strain on Mn site, which results in the enhanced temperature dependence of the bandwidth and peak position. Mn luminescence spectral lineshape is highly robust with respect to the change in the polarity, phase and pH of the surrounding medium and aggregation of the NCs, showing great potential in temperature imaging under chemically heterogeneous environment. The temperature sensitivity (ΔIR/IR = 0.5%/K at 293 K, IR = intensity ratio at two different wavelengths) is highly linear in a wide range of temperatures from cryogenic to above-ambient temperatures. We demonstrate the surface temperature imaging of a cyro-cooling device showing the temperature variation of >200 K by imaging the luminescence of the NC film formed by simple spin coating, taking advantage of the environment-insensitive luminescence.
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