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Organic‐inorganic hybrid perovskite quantum dots have always been  the  focus of  research  in  recent years. However,  the toxic Pbin MAPbBr3 (MA = CH3NH3 ) quantum dots and low stability restrict the application in the field of lighting display. In  order  to  solve  this  problem, the MA(Pb,Cu)Br3 perovskite  quantum  dots with  Pb   replaced  by  non‐toxic  Cu were synthesized  via  the  auxiliary  ligand precipitation.  The phase  evolution,  controlled‐color  and  fluorescent properties were systematically  studied.  The  photoluminescence  (PL)  spectra monitored  at  the wavelength  of  400  nm  showed  that  the fluorescence emission  intensity of quantum dots gradually decreased with the  increase of the concentration of Cu, and the phenomenon of blue shift appeared. Moreover, the decay lifetime decreased when the dopant concentration of Cu gradually  increased.  The  influence mechanism was  discussed  in  details.  In  order  to  improve  the  stability,  the MA(Pb, Cu)Br3@SiO2 quantum dots were prepared by the hydrolysis of tetramethyl orthosilicate (TMOS). Meanwhile, the effect of temperature on the fluorescence properties of quantum dots was investigated in detail. The high stability and low toxicity of the MA(Pb, Cu)Br3@SiO2 quantum dots are expected to be used in the fields of lighting display and solar cells.

Study on MA(Pb,Cu)Br3 Provskite Nanocrystal with Both Controlled Color Emission and Improved Stability