초록
<P>Due to their excellent optical and electrical properties, all-inorganic metal halide perovskite CsPbBr3quantum dots (QDs) have become one of the most promising materials in the field of optoelectronics during recent years. However, the stability of CsPbBr3QDs limits their practical application and further development to a certain extent. In order to improve their stability, CsPbBr3QDs were modified with 2-<I>n</I>-octyl-1-dodecanol for the first time in this paper. The 2-<I>n</I>-octyl-1-dodecanol-modified CsPbBr3QDs were prepared by the ligand-assisted reprecipitation (LARP) method at room temperature in an air environment. Then the stability of the samples was tested at different temperatures and humidity. When the humidity was 80%, the photoluminescence (PL) intensity of both unmodified and modified CsPbBr3QDs increased to different degrees because the appropriate amount of water changed the crystallization environment. The PL intensity of the modified QDs increased, and the peak positions were basically not shifted, proving that they did not agglomerate. Thermal stability test results showed that the PL intensity of the 2-<I>n</I>-octyl-1-dodecanol-modified QDs could still maintain 65% of the original intensity at 90 °C, which is 4.6 times that of the unmodified CsPbBr3QDs. Experimental results show that the stability of CsPbBr3QDs is significantly improved after 2-<I>n</I>-octyl-1-dodecanol modification, which demonstrates the excellent surface passivation of CsPbBr3QDs by 2-<I>n</I>-octyl-1-dodecanol.</P>