Improvement Of Luminescence Properties Of Polymer Materials And Devices By Chain Orientation Technology

Liquid crystal conjugated polymers(LCCP)have received continuous attention due to their dual properties of both liquid crystals and conjugated polymers.The oriented liquid crystal conjugated polymer has unique long-range ordering and thus has broad development prospects in the field of optoelectronics.However,the research on liquid crystal conjugated polymers is not yet mature.The focus of current research is to find LCCP materials with excellent performance and how to improve the orientation of LCCP simply and efficiently,and improve the structure of electroluminescent devices to achieve high brightness and high efficiency.In this paper,the luminescent properties of polymer materials and devices are explored and improved through a simple orientation process.The specific research contents include the following aspects:(1)Molecular chain alignment(chain orientation)of liquid crystal conjugated polymer F8 BT and binary blended red-light polymer F8BT/Red F was realized by simple polarization ultraviolet irradiation using a polarization sensitive medium sulfonazo dye SD1 as orientation substrate.Absorption and emission spectra after orientation of the two polymers and anisotropy of ASE were compared and tested.The relationship between film thickness and the effect of chain orientation was studied in detail,and then planar optical waveguides with high spatial resolution were fabricated by local chain orientation,and double-layer planar optical waveguides were fabricated by laminated orientation technology,and their properties were studied.Finally,by changing the orientation of the waveguide pattern chain,the direction of optical signal transmission is controlled.(2)Using PEDOT:PSS as the orientation substrate,the properties of PFO,F8 BT,PFO/F8 BT and F8BT/Red F orientation were explored,and the relationship between film thickness and the effect of chain orientation of various materials was studied in detail.Tri-primary color red-green-blue(RGB)polarized light-emitting diodes were prepared by using PEDOT:PSS as the hole transport layer.Unlike traditional polarizer-added light emitting diodes,the light emitting diodes fabricated by this method not only exhibit obvious dichroism and effective polarization emission,but also avoid more than 50% optical loss caused by adding polarizer.By aligning the binary mixtures of PFO/F8 BT and using the effective energy transfer to the receptor,a higher polarization emission efficiency is achieved than that of F8 BT monomer.(3)The orientation conditions of the ? phase PFO and the change of the properties after orientation were investigated.It was proved that the doped paraffin oil would cause the PFO to be unoriented,and the ? phase effect gradually disappeared when the annealing temperature exceeded 130°C.At the same time,the orientation of the alcohol-soluble material PFN-Br was explored to achieve better dichroism.Inversion blue light-emitting diodes were prepared using this material as an electron transport layer.Although the device performance is not as good as that of the PEDOT:PSS substrate,it has better polarization than the PEDOT:PSS substrate,and can also avoid more than 50% optical loss.