| 초록 |
The easily tunable emission of halide perovskite nanocrystals makes them an extremely promising material for light-emitting applications. Whereas high quantum yield and long-term colloidal stability have already been achieved for nanocrystals emitting in the red and green spectral range, the blue region currently lags behind with low quantum yields, and insufficient colloidal stability. In this work, we present a facile synthetic and post-synthetic approach for obtaining two-dimensional CsPbBr3 nanoplatelets with thickness homogeneousity control over their solidified surface, resulting in sharp photoluminescence and electroluminescence peaks with a deep blue emission wavelength 465 nm due to quantum confinement. Subsequent addition of solidifying ligand solution seal the surface defects likely stemming from vacancies in a subensemble of weakly emissive nanoplatelets. The overall photoluminescence quantum yield of colloidal dispersions is consequently enhanced up to a value of 65%. |
