Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing, 100044, People's Republic of China. Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing, 100044, People's Republic of China.
Nanotechnology. 2017 Nov 3;28(44):445602. doi: 10.1088/1361-6528/aa892e. Epub 2017 Aug 30.
Lead halide perovskite materials are thriving in optoelectronic applications due to their excellent properties, while their instability due to the fact that they are easily hydrolyzed is still a bottleneck for their potential application. In this work, water-resistant, monodispersed and stably luminescent cesium lead bromine perovskite nanocrystals coated with CsPbBr were obtained using a modified non-stoichiometric solution-phase method. CsPbBr 2D layers were coated on the surface of CsPbBr nanocrystals and formed a core-shell-like structure in the synthetic processes. The stability of the luminescence of the CsPbBr nanocrystals in water and ethanol atmosphere was greatly enhanced by the photoluminescence-inactive CsPbBr coating with a wide bandgap. The water-stable enhanced nanocrystals are suitable for long-term stable optoelectronic applications in the atmosphere.
卤铅钙钛矿材料由于其优异的性能在光电应用中蓬勃发展，而其易水解的不稳定性仍是其潜在应用的瓶颈。在这项工作中，使用改进的非化学计量的溶液法获得了具有耐水性、单分散性和稳定发光性的 CsPbBr 包覆的卤铅钙钛矿纳米晶。CsPbBr 2D 层包覆在 CsPbBr 纳米晶的表面上，并在合成过程中形成核壳状结构。宽禁带的光致发光非活性 CsPbBr 包覆层极大地提高了 CsPbBr 纳米晶在水和乙醇气氛中的发光稳定性。稳定的增强纳米晶适用于在大气中进行长期稳定的光电应用。
