| 초록 |
In this study, inorganic CsPbX3 perovskites with compositions including CsPbBrxCl3–x, CsPbBr3, and CsPbBrxI3–x were synthesized, and their properties were investigated. Tauc plots calculated from the UV-vis spectra of the materials showed that the band gaps of CsPbBrxCl3–x, CsPbBr3, and CsPbBrxI3–x were 2.7, 2.35, and 1.8 eV, respectively. The as-prepared CsPbX3 nanocrystals (NCs) had a cubic structure and their crystal sizes were around 5–10 nm. The diffraction peak intensity of the (110) plane increased by adding Cl anion and reduced by adding I anion. In contrast, the peak intensity of the (200) plane reduced by the introduction of Cl– ions and increased by the introduction of I– ions, suggesting that the nature of the halide anions affects the crystal orientation of CsPbX3 quantum dots. The maximum luminance values measured for CsPbBrxCl3–x, CsPbBr3, and CsPbBrxI3–x -based LEDs were 15.2, 51.7 and 21.7 cd/m2, respectively. |
