Sinha Shriya, Mahata Manoj Kumar, Kumar Kaushal, Tiwari S P, Rai V K
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Feb 15;173:369-375. doi: 10.1016/j.saa.2016.09.039. Epub 2016 Sep 24.
Temperature sensing performance of Er/Yb doped CaMoO phosphor prepared via polyol method is reported herein. The X-ray diffraction, Fourier transform infrared spectroscopy and field emission scanning electron microscopy are done to confirm the phase, structure and purity of the synthesized phosphor. The infrared to green upconversion emission is investigated using 980nm diode laser excitation along with its dependence on input pump power and external temperature. The temperature dependent fluorescence intensity ratio of two upconversion emission bands assigned to H→I (530nm) and S→I (552nm) transitions has shown two distinct slopes in the studied temperature range - 300 to 760K and therefore, dual nature of temperature sensitivity is observed in this phosphor. This phenomenon in rare earth doped materials is either scarcely reported or overlooked. The material has shown higher sensitivity in the high temperature region (535K<T<760K) with a maximum of 7.21×10K at 535K. The results indicate potential of CaMoO: Er/Yb phosphor in high temperature thermometry.
本文报道了通过多元醇法制备的掺铒/镱钼酸钙荧光粉的温度传感性能。通过X射线衍射、傅里叶变换红外光谱和场发射扫描电子显微镜来确认合成荧光粉的相、结构和纯度。利用980nm二极管激光激发研究了红外到绿色的上转换发射及其对输入泵浦功率和外部温度的依赖性。分配给H→I（530nm）和S→I（552nm）跃迁的两个上转换发射带的温度相关荧光强度比在300至760K的研究温度范围内显示出两个不同的斜率，因此，在这种荧光粉中观察到了温度敏感性的双重性质。稀土掺杂材料中的这种现象鲜有报道或被忽视。该材料在高温区域（535K<T<760K）表现出更高的灵敏度，在535K时最大为7.21×10K。结果表明掺铒/镱钼酸钙荧光粉在高温测温方面具有潜力。
