Strontium oxide–Barium oxide–Aluminium oxide ternary nanocomposite: Photoluminescence and electrochemical analysis for display and supercapacitor applications

Abstract

indent In the present communication, a ternary nanocomposite (NCs) of Strontium oxide (SrO), Barium oxide (BaO), and Aluminium oxide (Al2O3) were synthesized and their photoluminescence and electrochemical analysis were performed for display and supercapacitor applications. The NCs were synthesized by solution combustion method using both chemical (SBA-U) and green extract as a fuel/reducing agent (SBA-A). The synthesized sample is subjected to calcination at 600 ° C for 3 h. The Bragg reflections of the synthesized NCs can be attributed to hexagonal SrO, tetragonal BaO and spinel cubic γAl2O3. The SEM image clearly shows the presence of agglomerated irregular size and shaped NPs. The agglomeration was found to be more in SBA-U NCs rather than SBA-A NCs. The direct energy band gap was determined from UV-visible absorption spectra using Wood and Tauc’s relation. The estimated energy band gap was found to be less in SBA-A (3.81 eV) than that of SBA-U NCs (3.88 eV). Further, photoluminescence emission spectra recorded at 300 nm excitation wavelength consist of the high-intensity peak in the green region whereas satellite peaks in blue and red regions. However, the CIE plot and color-correlated temperature confirm the present synthesized NCs are promising candidates for display technology as a green phosphor material. Further, electrochemical studies were performed and the supercapacitance value was determined, which varied within the range of 97.2 to 59.6 F/g at different scan rates. Even though the fuel/reducing agent shows their effect on the intensity of photoluminescence spectra, no such variations are observed in the electrochemical studies. The synthesized samples from both methods might find an application in display and supercapacitor applications.