Structural characterization &, optical and electrical properties of LiGaO2 & LiGa5O8 micro-nanoparticles-based photodetectors

Abstract Lithium gallium oxide (LiGaO2 & LiGa5O8) nanoparticles were successfully prepared through thermal evaporation method under the different atmospheric-conditions. The experimental results show that the LiGa5O8 nanoparticles are easier to synthesize in the air, while the LiGaO2 nanoparticles are more suitable for argon environment. The luminescence properties of LiGaO2 & LiGa5O8 nanoparticle-based photodetector show that the near-infrared emission is mainly owing to the defect level caused by Li ions in the lattice and the 2S–2P0 intra-ion transition of Li ions and the green-yellow emission is caused by intrinsic defects. The electrical properties of the LiGaO2 & LiGa5O8 nanoparticle-based photodetector indicate that the resistance value increases significantly in the case of illumination compared with dark conditions. The experimental results show that the nanoparticle-based photodetector is very sensitive to temperature change (24–40 °C).