Synthesis Of Carbon Dots And Perovskite Chiral Optical Materials Via Self-assembly And Research On Their Optical And Electrical Properties

Chiral inorganic nanomaterials can be widely used in biosensors,enantioselective catalysis,negative refractive index materials and electrical equipment due to their unique circular polarization.Among them,chiral luminescent materials have been extensively investigated because they can be used to make chiral fluorescent sensors,circularly polarized(CPL)photodetectors,CPL light sources,and circularly polarized light-emitting diodes(LEDs).How to give luminescent materials with chiral properties and in-depth study of their optoelectronic properties has always been a frontier scientific issue in this field.Among many luminescent materials,carbon dots and all-inorganic perovskite quantum dots are the most distinctive materials.They have the characteristics of low toxicity,modulated luminescence,and the band gap energy and emission spectrum can be tuned through quantum size effect and composition control.Therefore,this thesis separately synthesize carbon dots/chiral amino acid molecules,all-inorganic perovskite/inverse opal structure composite luminescent materials via self-assembly process,and analyze their unique chiral optical properties through a variety of spectra.The first chapter is the introduction,which mainly includes the following three parts: 1.Introduce the concept and classification of luminescent materials,the structure,properties,synthesis methods and applications of carbon dots and perovskite quantum dots;2.Explain the basic concept of chirality and synthesis and application of chiral luminescent materials;3.Describe the development history and preparation methods of photonic crystals and their composite materials.In the second chapter,we mainly describe the synthesis method of carbon-based chiral nanofibers and their chiral optical characteristics.Through the self-assembly process,carbon dots(CDs)and cysteine can interact to form a one-dimensional nanofiber with a chiral optical signal.The chiral optical signal is strongly derived from the chirality of cysteine,and its strength can be controlled by temperature,and its multi-photoluminescence can show white light emission in the CIE chromaticity diagram.In addition,chiral hybrid nanofibers show excellent electrocatalytic performance in lithium-oxygen air batteries,and their performance is better than commercial platinum carbon catalyst.In the third chapter,we used the silica inverse opal structure and all-inorganic perovskite to prepare a composite material of photonic crystals.By changing the halogen content,we prepared blue,green,and red perovskite/photonic crystals.At the same time,we found that due to the modulation of the photonic band gap of the photonic crystal,the luminescence of the perovskite quantum dots has a weak shift.In addition,we used this material to prepare high-performance blue,green and red LED lights.The research on the preparation of perovskite quantum dot@chiral silica inverse opal structure and the chiral optical properties is ongoing.