Research On The Controllable Preparation And Photonic Properties Of Organic Small Molecule Microwires

With the progress and development of science and technology,people have higher and higher requirements for devices,such as miniaturization,high performance,and multi-function.These requirements also pose great challenges to materials and devices.In recent years,the micro-nano structures of one-dimensional organic molecules have attracted widespread attention and research,such as nanotubes,nanowires,etc.The unique structure of one-dimensional micro-nano materials and the wonderful physical properties exhibited by the quantum size effect,combined with the special properties of organic molecules,are expected to meet people's needs.In short,one-dimensional organic micro-nano structures,as the basic building units of photonics devices,have a strong practical background.As an indispensable part of the photonic integrated circuit(PIC),the optical waveguide dielectric material with low transmission loss is of great significance.The controllable preparation of organic micro-nano heterostructures is very important for realizing the versatility of organic molecular materials,and can give full play to the advantages of continuous adjustment of organic molecules.Around the research on the controllable preparation of organic microwires and its photonic properties,two researches have been carried out:(1)Research on the controllable preparation of organic small molecule MPYP microwires and its photonic properties: The microwires of the organic molecule2-Methoxy-6-(pyridin-2-yliminomethyl)-phenol(MPYP)are prepared by using the liquid-phase drop casting method,and a more regular single-crystal microwires can be obtained with the aid of solvent assisted;Through the method of controlling volatilization by space restriction,a pattern of microwires with specific orientation was prepared;By changing the concentration of the solution,the time of self-assembly,the temperature of the system and other experimental parameters,the morphology and size of the microwires can be adjusted to a certain extent to meet the requirements for the morphology and size of different devices;Through the study of MPYP microwires optical waveguide behavior and optical waveguide loss,MPYP microwires have a lower transmission loss level,which proves that organic small molecule MPYP is an excellent organic optical waveguide dielectric material.(2)Research on the controllable preparation of TPI@MPYMP organic microwires heterojunction and its photonic properties: Using 2,4,5-triphenylimidazole(TPI)molecule as the host material,2-[(5-Methoxy-pyridin-2-ylimino)methyl]-phenol(MPYMP)molecule as the guest material.The liquid phase cooperative assembly process of the two molecules is studied by using the liquid phase reprecipitation method,and the axial heterostructure of the blue/yellow multi-segment organic microwires is realized;By changing the ratio of host and guest molecules,assembly time and system temperature,the spatial distribution of the luminescent color of the microwires heterostructure is regulated;Using the energy transfer process between host and guest molecules,the spatial distribution characteristics of the luminescence lifetime of the microwires heterostructure are changed.