Many researchers are now interested in metal halide hybrid perovskites because this class of hybrid perovskites shows efficient emission and has bandgap tunability, high carrier mobility, and long carrier diffusion even in polycrystalline films fabricated with low-cost solution processing such as spin-coating. By taking these advantages, hybrid perovskites can be used for many optoelectronic devices, which include solar cells, light-emitting diodes, field-effect transistors, and laser devices. In Kyushu University, we demonstrated very stable hybrid perovskite solar cells by clarifying their degradation mechanisms. We analyzed electroluminescence mechanisms of hybrid perovskite LEDs, leading to a marked increase in electron-to-photon conversion efficiency. In hybrid perovskite field-effect transistors, we obtained very high hole and electron mobilities of 50-100 cm2/V s, along with excellent air and bias stability. We successfully reduced lasing thresholds of hybrid perovskite laser devices under optical pumping through the optimization of film fabrication conditions and device architectures, with the aim of realizing electrically pumped hybrid perovskite semiconductor lasers in future. We recently found that hybrid perovskites can be excellent host or carrier transport layers for organic light-emitting diodes. With perovskite transport layers, we demonstrated that device thickness was increased by more than ten times without increasing driving voltage and decreasing external quantum efficiency or operational durability. The energy transfer from a perovskite to an organic emitter overcame the singlet generation efficiency limit 25% for fluorescent organic light-emitting diodes, opening a way to the fabrication of higher-performing devices at a lower cost in future.