Light-induced synthesis of highly stable CsPbCl3:Mn2+@mSiO2 nanocomposites for white Light-Emitting Diodes

All-inorganic perovskite nanocrystals (NCs) exhibit great promise in optoelectronics and photovoltaics. However, their intrinsic low-thermal/oxygen/moisture stability and the rigorous synthesis procedures have limited the practical applications. Here, we present a facile, one-step, light-induced method to synthesize CsPbCl 3 :Mn 2+ NCs at room temperature by using carbon tetrachloride (CCl 4 ) as the halide source. The corresponding formation mechanism of CsPbCl 3 :Mn 2+ NCs is revealed, where CsPbCl 3 :Mn 2+ NCs are formed through the direct incorporation of [MnCl 6 ] 4− octahedral into the perovskite lattice during the nucleation and growth process. Additionally, we demonstrate the in-situ growth of CsPbCl 3 :Mn 2+ NCs within mesoporous silica (mSiO 2 ) spheres to form CsPbCl 3 :Mn 2+ @mSiO 2 nanocomposites via the light-induced method, resulting in a remarkable improvement in high-temperature and long-time stability. As a prototype experiment, a white light-emitting diode (WLED) device is constructed using CsPbCl 3 :Mn 2+ @mSiO 2 nanocomposites, which exhibits a bright white-light emission with the CIE chromaticity coordinate of (0.352, 0.340). It is anticipated that light-induced synthesis method provides a straightforward strategy for synthesizing multifunctional halide perovskite nanocrystals and nanocomposites for versatile applications.