Cai Peiqing, Wang Xiangfu, Seo Hyo Jin
College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, 210023, People's Republic of China.
Phys Chem Chem Phys. 2018 Jan 17;20(3):2028-2035. doi: 10.1039/c7cp07123j.
A Mn doped NaWOF phosphor was synthesized through a two-step wet chemical method. The relationship between crystal structure and luminescence properties is discussed and unusual strong intense zero phonon lines (ZPLs) have been found in a distorted octahedral environment. The power dependent luminescence spectra exhibit the existence of down conversion luminescence intensity saturation under a high pumping power limit. The fluorescence intensity ratios of anti-Stokes bands to the ZPL and Stokes bands reveal an obvious temperature dependent relationship based on thermal de-population from the low states to the upper states of an intrinsic MnE → A transition. The temperature dependent emission intensity of Mn is investigated by changing the excitation power, and an optical temperature sensitivity as high as 0.00658 K is achieved at 193 K with the intensity ratio of anti-Stokes bands to the ZPL under 488 nm excitation by a Xenon lamp. This work presents a new method to realize optical thermometry at low temperature by controlling the intensity ratio of the anti-Stokes bands to the ZPL.
通过两步湿化学法合成了一种锰掺杂的钨酸钠磷光体。讨论了晶体结构与发光性能之间的关系，并在扭曲的八面体环境中发现了异常强烈的零声子线（ZPL）。功率依赖的发光光谱表明在高泵浦功率极限下存在下转换发光强度饱和现象。基于从本征MnE→A跃迁的低态到高态的热去布居，反斯托克斯带与ZPL和斯托克斯带的荧光强度比揭示了明显的温度依赖关系。通过改变激发功率研究了锰的温度依赖发射强度，在193 K下，用氙灯在488 nm激发下，反斯托克斯带与ZPL的强度比实现了高达0.00658 K的光学温度灵敏度。这项工作提出了一种通过控制反斯托克斯带与ZPL的强度比来实现低温光学测温的新方法。
