Research And Application Of Luminescent Metal Halide Materials And Hybrid Nanomaterials

In recent years,CsPbX3 perovskite quantum dots(PeQDs)have gained intensive attentions due to their superior optical properties,such as large absorption cross section,high photoluminescence quantum yields(PLQY),tunable bandgap and high color purity,which make PeQDs ideal materials for light-trapping or light-emitting candidates for photovoltaic and photovoltaic applications.However,lead toxicity and instability of these perovskites prevent their wide-scale industrial applications.In this work,the CaF₂:Yb³⁺/Ho³⁺HNSs loading with CsPbX₃(X=Br,I)PeQDs(HNS-PeQDs)were first reported,which improved the stability of water and oxygen.In order to solving the toxicity of lead in metal halides,we designed manganese metal halide nanomaterials,and realized the detection of alpha fetoprotein.Further,the rare earth ion doped manganese metal halides were used to achieve high fluorescence emission and improve the stability of water and oxygen,and achieved efficient dual-mode bio-imaging and dual-mode anti-counterfeiting applications..The specific research contents are as follows:(1)In this work,we synthesized the CsPbI₃ and CaF₂:Yb³⁺/Ho³⁺composite structure,which has high stability in water and oxygen.Furthermore,composite structure with the capability of up-conversion and down-conversion concurrently achieved efficient dual-mode bio-imaging and dual-mode anti-counterfeiting applications.(2)In this work,we successfully synthesized Cs3MnBr5 NCs with a fluorescence quantum yield of 38%.In addition,a kind of composite biological electrodes were prepared by employing Cs3MnBr5 NCs,and the alpha fetoprotein detections were successfully realized.(3)In this work,the Ce³⁺doped lead-free Cs3MnBr5 NCs were successfully synthesized using a modified hot-injection method,which displayed efficient blue PL.Compared to the bare Cs3MnBr5 NCs,the Cs3MnBr5:Ce³⁺NCs displayed highly improved PL with PLQY increasing from?38%to?90%and highly improved longtime stability.The Ce³⁺doped Cs3MnBr5 NC film was used as an active layer to fabricate the broadband UV photodetector.