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Efficient dual emission mode of green emitting perovskite BaTiO3: Er3+ phosphors for display and temperature sensing applications
Ceramics International ( IF 5.2 ) Pub Date : 2018-03-18
Dhananjay Kumar Singh, J. Manam

Er3+ ions activated perovskite BaTiO3 green emitting phosphors were synthesized via conventional solid-state reaction method to study the optical spectroscopy and temperature sensing behaviors. Structural analysis based on the X-ray diffraction studies indicates that the phosphors possess the tetragonal structure with space group P4mm (99). The Ba(1-x)TiO3:xEr3 phosphors exhibited efficient dual emission mode with a sharp and intense visible green emission peaks centred at 525 nm (2H11/24I15/2) and 550 nm (4S3/24I15/2) via the up-conversion process by using 980 nm Laser source excitation and the down-conversion process upon the 380 nm UV-Light excitation. The fluorescence intensity ratio (FIR) method was employed to analyze the sensing performances of two thermally coupled energy levels (2H11/2 and 4S3/2) of Er3+ ion in the prepared phosphors. The temperature sensitivity was tested over a wide range of temperature 300–450 K and maximum sensitivity was observed as 0.0032 K−1 at 400 K for optimized stoichiometry Ba(0.9925)TiO3:0.0075Er3+. Also, the diffuse reflectance spectra were utilized to estimate the optical band gap of Ba(1-x)TiO3:xEr3+ phosphors are obtained in the range 3.344 − 3.351 eV. Furthermore, the decay time analysis and CIE chromaticity color coordinates were studied in the present work. Therefore, these experimental results indicated the suitability of the Ba(1-x)TiO3:xEr3+ phosphors for display and temperature sensing applications.



中文翻译:

用于显示和温度传感应用的绿色钙钛矿型BaTiO 3:Er 3+磷光体的高效双发射模式

通过常规固相反应方法合成了Er 3+离子活化的钙钛矿型BaTiO 3绿色荧光粉,研究了光谱学和温度传感行为。基于X射线衍射研究的结构分析表明,磷光体具有空间结构为P4mm的四方结构(99)。Ba (1-x) TiO 3:xEr 3荧光粉表现出有效的双发射模式,在525 nm(2 H 11/ 24 I 15/2)和550 nm(4 S 3/2415/2)是通过使用980 nm激光源激发的上转换过程和在380 nm紫外光激发下的下转换过程来实现的。采用荧光强度比(FIR)方法分析了制备的荧光粉中Er 3+离子的两个热耦合能级(2 H 11/24 S 3/2)的传感性能。温度敏感性经观察到K和最大灵敏度为0.0032 K A宽的温度范围为300-450的测试-1在400 K中优化化学计量的Ba (0.9925)的TiO 3:0.0075Er 3+。另外,利用漫反射光谱来估计Ba (1-x) TiO3:xEr的光学带隙。在3.344-3.351 eV范围内获得了3+磷光体。此外,本文还研究了衰减时间分析和CIE色度色坐标。因此,这些实验结果表明Ba (1-x) TiO 3:xEr 3+荧光粉适用于显示和温度传感应用。

更新日期:2018-03-19
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