| The open framework of metal halide is an important type of inorganic porous crystalline material,not only because of its intriguing structure in crystal engineering,but also because of its extensive use in optoelectronic devices,photocatalysis,luminescence,thermochromism,photochromism,etc.application.In this paper,guided by the function-oriented structural design ideas,the structural chemistry of the three-dimensional non-perovskite-type metal halide open framework is studied.The main content of the research and the results obtained are summarized as follows:（1）Herein,by rationally introducing d10transition metal into single lead halide as new structural building unit and optical emitting center,we prepared a bimetallic halide of[（NH4）2]Cu PbBr5with new type of three-dimensional（3D）anionic framework.Remarkably,[（NH4）2]Cu PbBr5exhibits strong band-edge blue emission（441 nm）with high PLQY of 32%upon UV light excitation.Besides the blue emission,detailed photophysical studies indicate[（NH4）2]Cu PbBr5also display broadband red light emissions derived from self-trapped states.Furthermore,the 3D framework features high structural and optical stabilities at extreme environments during at least three years.To our best knowledge,this work represents the first 3D non-perovskite bimetallic halide with highly efficient and stable blue light emission.（2）Herein,by using a structural design strategy of incorporating hetrometallic halide blocks,we prepared the first three-dimensional（3D）non-perovskite bimetallic halide of[H2DABCO]2Cu6PbBr12with new topological network based on two types of 6-connected nodes.Remarkably,this 3D framework displays highly efficient thermochromic luminescence from broadband yellow light emission（photoluminescence quantum yield of 7.2%）at room temperature to green emission at 77 K with remarkable stability in extreme environment at least three years.This compound realizes the combination of 3D framework and broadband light emission in hybrid metal halides. |
