Chen Jiajun, Qian Fangsheng, Zhuang Chen, Zhang Yining, Zhang Jia
Physics Department and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligence, Huaiyin Normal University, 111 West Chang Jiang Road, Huai'an 223300, China.
Physics Department and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligence, Huaiyin Normal University, 111 West Chang Jiang Road, Huai'an 223300, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 May 15;253:119602. doi: 10.1016/j.saa.2021.119602. Epub 2021 Feb 24.
Motivated from increasing demands of non-contact optical temperature sensing, the Yb-Er and Eu doped NaYSiO (NYS) oxide phosphors were designed by high-temperature solid-state reaction method. The phase purity of the as-prepared samples was checked from XRD patterns. For the upconversion luminescence in NYS:Yb,Er, the optimal Er doping content was determined to be 1 mol%, and the characteristic emission peaks of Er were observed in the region of 500-700 nm. In Eu activated NYS phosphors, it has been found that the emissions originating in D and D levels demonstrate different change tendencies in intensity with Eu doping concentration. By studying the temperature-dependent luminescent spectra, it was indicated that the emissions intensities from different excited states of Er change differently with temperature. Two kinds of fluorescence intensity ratio (FIR) strategies were used in NYS:10%Yb,1%Er, containing thermally-coupled levels and non-thermally-coupled levels. In the NYS:3%Eu phosphor, it was found that the FIR for 577 and 536 nm emissions follows a linear relation with temperature. The high sensitivities in the present phosphors indicate the potential application in optical temperature sensing.
受非接触式光学温度传感需求不断增加的推动，采用高温固态反应法设计了Yb-Er和Eu掺杂的NaYSiO（NYS）氧化物荧光粉。通过XRD图谱检查了所制备样品的相纯度。对于NYS:Yb,Er中的上转换发光，确定最佳的Er掺杂含量为1 mol%，并在500-700 nm区域观察到了Er的特征发射峰。在Eu激活的NYS荧光粉中，发现源自D和D能级的发射强度随Eu掺杂浓度呈现不同的变化趋势。通过研究温度相关的发光光谱表明，Er不同激发态的发射强度随温度变化不同。在包含热耦合能级和非热耦合能级的NYS:10%Yb,1%Er中使用了两种荧光强度比（FIR）策略。在NYS:3%Eu荧光粉中，发现577和536 nm发射的FIR与温度呈线性关系。当前荧光粉的高灵敏度表明其在光学温度传感方面的潜在应用。
