| 초록 |
Lead halide perovskite are promising semiconductors for light-emitting applications because they exhibit bright, bandgap-tunable luminescence with high color purity. However, owing to defects in grain boundaries and low exciton binding energy, there are difficulties in realizing efficient and bright electroluminescence from Lead halide perovskite light-emitting diode (PeLED). So, charge carrier confinement and defect passivation are the main research struggle for the development of efficient PeLEDs. In this study, we tried a green-emitting PeLED by adding alkali metal halide. Interestingly, the increases in photoluminescence intensity and lifetime of perovskite film with alkali metal halide compared to those of the pristine films suggest improved radiative recombination. Also defect density in perovskite films with alkali metal halide is significantly suppressed owing to defect passivation at the grain boundaries. |
