Surface Treatment Of Inorganic Peroskite Quantum QDs And Their Photoluminescence Properties

All-inorganic cesium lead halide perovskite CsPbX3(X=Cl,Br,I)nanocrystals are promising candidates for the next generation light-emitting diodes(LED)due to their ultrahigh photoluminescence quantum yield,narrow line-widths and tunable emission wavelength.However,the instability of these nanocrystals towards moisture,oxygen and ultraviolet light severely hinders their practical applications.Here,we developed a method to synthesize SiO2/CsPbX3 composite spheres to significantly improve the stability of perovskite nanocrystals.We directly grew CsPbX3 NCs in the pores of the mesoporous silica spheres.This method can effectively increase the NC stability.In addition,we reported an effective method of surface passivation through silver-trioctylphosphine(Ag-TOP)treatment.This method can highly increase the photoluminescence intensity and photostability.These effective strategies should be highly encouraging from the perspective of halide perovskite stability.These efforts may effectively accelerate their practical applications.