Senapati Subrata, Kar Nanda Karuna
Materials Research Centre, Indian Institute of Science, Bangalore-560012, India.
Phys Chem Chem Phys. 2017 Jan 18;19(3):2346-2352. doi: 10.1039/c6cp06608a.
Fluorescence intensity ratio (FIR) based optical temperature sensors employ the variation of intensity ratio between two peaks, which are very close to each other. Here, we prepare Er doped ZnO microrods by a hydrothermal route and exploit them for FIR based temperature sensing. The Er:ZnO shows the band-to-band UV emission and broad defect emissions with small Er related peaks upon excitation with a 355 nm laser, while only peaks corresponding to Er transitions are observed with 532 nm laser excitation. The green emissions (H → I, S → I) under 532 nm excitation are considered for temperature sensing performance as they possess a quasi-thermal equilibrium between them and the variation of intensity ratio with temperature follows a Boltzmann type distribution. The sensitivity obtained here is very high (3445/T K) compared to the reported Er ion based temperature sensors and can be applied in a wide range of temperature (83-493 K). The value of sensitivity is found to be almost independent of the concentration of Er doping and is the highest reported for Er-doped materials.
基于荧光强度比（FIR）的光学温度传感器利用两个彼此非常接近的峰之间的强度比变化。在此，我们通过水热法制备了掺铒氧化锌微棒，并将其用于基于FIR的温度传感。掺铒氧化锌在355nm激光激发下表现出带间紫外发射和宽的缺陷发射以及与铒相关的小峰，而在532nm激光激发下仅观察到对应于铒跃迁的峰。532nm激发下的绿色发射（H→I，S→I）被用于温度传感性能研究，因为它们之间存在准热平衡，且强度比随温度的变化遵循玻尔兹曼型分布。与已报道的基于铒离子的温度传感器相比，此处获得的灵敏度非常高（3445/T K），并且可应用于宽温度范围（83 - 493K）。发现灵敏度值几乎与铒掺杂浓度无关，是掺铒材料报道中的最高值。
