摘要
铯基卤化铅(CsPbI_3)钙钛矿纳米晶具有高光致发光效率、窄的半峰宽及高量子产率等光电特性。但是由于纳米晶的表面缺陷,导致CsPbI_3钙钛矿纳米晶稳定性较差,限制了其应用范围。改善表面缺陷,提高纳米晶的稳定性成为研究热点。所以在传统热注法制备CsPbI_3纳米晶的基础上,采用简单的母液稀释法,160℃下油浴合成晶格间距为0.62 nm对应CsPbI_3标准卡片(100)晶面的立方相纳米晶。通过表征纳米晶的荧光发射和吸收性能,并结合稳定时间的变化,结果发现其发射峰稳定在680~700 nm左右。稳定时间由原来的7 d提高到10 d,大大提高了CsPbI_3纳米晶的稳定性,而且降低了发射波长峰值处强度衰减速率,延迟了荧光猝灭进程。
Cesium-based lead halide(CsPbI_3)perovskite nanocrystals have photoelectric properties such as high photoluminescence efficiency,narrow half-peak width and high quantum yield.However,due to the surface defects of the nanocrystals,the stability of CsPbI_3 perovskite nanocrystals is poor,which limits their application range.Improving the surface defects and improving the stability of nanocrystalline have become a research hotspot.Therefore,on the basis of the preparation of CsPbI_3 nanocrystals by traditional thermal injection method,a simple mother solution dilution method was adopted to synthesize cubic phase nanocrystals corresponding to the standard card(100)crystal surface of CsPbI_3 with a lattice spacing of 0.62 nm at 160℃oil bath.The fluorescence emission and absorption properties of nanocrystalline were characterized,and the stability time was changed.The results show that the emission peak is stable at the range of 680 nm to 700 nm.The stability time increases from 7 d to 10 d,which greatly improves the stability of CsPbI_3 nanocrystals,and the intensity attenuation rate at the peak of emission wavelength is reduced,delaying the fluorescence quenching process.
引文
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