Probing the Thermodynamic and Magnetic Properties of UV-B-Emitting GdAlO₃ Phosphors by ESR and Optical Techniques

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• 作者：Vijay Singh ; G. Sivaramaiah ; M. Mohapatra ; J. L. Rao…
• 关键词：Combustion ; XRD ; ESR ; Gd3+ ions ; GdAlO3 ; optical
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：46
• 期：2
• 页码：1137-1144
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

GdAlO₃ phosphor samples have been prepared by a solution combustion method. X-ray diffraction analysis revealed that the GdAlO₃ phosphor stabilized in orthorhombic phase. The optical absorption spectrum showed bands due to Gd3+ ions as well as defect level in the host. The excitation spectrum exhibited a dominant band with maximum at 273 nm. Upon excitation at 273 nm, ultraviolet-B (UV-B) emission with maximum at 312 nm was observed from the undoped sample, being attributed to 6P_7/2 → ^{8S_7/2 transition of Gd3+ ion. The UV-B emission was enhanced at liquid-nitrogen temperature (77 K), most probably due to increased ground-state population according to the Boltzmann distribution law. Electron spin resonance spectra of samples at both room and liquid-nitrogen temperature exhibited resonance signals at g ≈ 2, attributed to Gd3+ ions arranged with octahedral symmetry linked via oxygen bridges. Various magnetic and thermodynamic parameters for the phosphor system were evaluated by standard procedures. Correlation of these values with the optical properties suggested that the GdAlO₃ phosphor can be effectively used as an UV-B light source for industrial applications at room temperature.}