LiSn 2 P 3 O 12 with sodium (Na) super ionic conductor (NASICON)-type rhombohedral structure was successfully obtained at low sintering temperature, 600°C via citric acid-assisted sol-gel method. However, when the sintering temperature increased to 650°C, triclinic structure coexisted with the rhombohedral structure as confirmed by X-ray diffraction analysis. Conductivity-temperature dependence of all samples were studied using impedance spectroscopy in the temperature range 30 to 500°C, and bulk, grain boundary and total conductivity increased as the temperature increased. The highest bulk conductivity found was 3.64×10 −5 S/cm at 500°C for LiSn 2 P 3 O 12 sample sintered at 650°C, and the lowest bulk activation energy at low temperature was 0.008 eV, showing that sintering temperature affect the conductivity value. The voltage stability window for LiSn 2 P 3 O 12 sample sintered at 600°C at ambient temperature was up to 4.4 V. These results indicated the suitability of the LiSn 2 P 3 O 12 to be exploiting further for potential applications as solid electrolytes in electrochemical devices.

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Multilayering of optical thin films is widely used for a range of purposes in photonic technology, but the development of nanofiber structures that can outperform thin films and nanoparticles in optical applications cannot simply be disregarded. Hybrid structures composed of Tm3+-doped SiO2–HfO2 in the form of nanofibers (NFs) and thin films (TFs) are deposited on a single substrate using the electrospinning and dip-coating methods, respectively. Ultrafine nanofiber strands with a diameter of 10–60 nm were fabricated in both single and multilayer samples. Enhanced photoluminescence emission intensity of about 10 times was attained at wavelengths of around 457, 512 and 634 nm under an excitation of 350 nm for NF-TF-NF* hybrid structures when compared with single-layered NF and TF structures. The arrangement of nanofibers and thin films in a multilayer structure influenced the luminescence intensity and spectral bandwidth. High transparency in the range of 75–95% transparency across the wavelength of 200–2000 nm was achieved, making it ideal for photonic application. Theoretical findings obtained through IMD software were compared with experimental results, and they were found to be in good agreement.