In-situ deposition of lead halide perovskite quantum dots in mesoporous YF3:Eu3+ matrices with multi-wavelength emission and remarkably enhanced stability

Abstract

Lead halide perovskite quantum dots (CsPbX3 PQDs, X = Cl, Br and I) have aroused wide concerns due to their outstanding optoelectronic characteristics. However, the simultaneous promotion of both high luminescence performance and brilliant stability is still a major challenge for their practical applications. Herein, Eu3+ doped YF3 nanospheres with hollow mesoporous structure are used to construct reactors for in-situ depositing CsPbX3 QDs through hot injection method. The as-synthesized CsPbBr3+YF3:Eu3+ nanocomposites exhibit multi-wavelength emission consisting of blue from self-trapped excitation (STE) emission of YF3 host, green from CsPbBr3 excitonic peak and red from characteristic emission lines of Eu3+. Besides, CsPbX3+YF3:Eu3+ composites with different halide compositions have been prepared and show multicolor emission with a wide color gamut. It is interesting to note that the stability of CsPbBr3+YF3:Eu3+ nanocomposites is remarkably enhanced under humid air, UV irradiation, and high temperature conditions compared to pristine CsPbBr3 QDs. This study provides new insights to realize stable CsPbX3 QDs-based multifunctional materials with multi-wavelength emission by combining with rare earth ions doped mesoporous materials and CsPbX3 QDs.