含碳量子点的聚合物分散液晶薄膜的电光及荧光特性OA

This study investigates the morphological structure,polarization mechanism,and fluorescence regulation effect of Polymer Dispersed Liquid Crystal(PDLC)composite materials doped with Carbon Quantum Dots(CQDs)nanomaterials.Based on the micro-morphological structure of PDLC films,the influence of this structure on liquid crystal droplet size is analyzed.Using dielectric measurement data and Cole-Cole plots,the CQDs-induced non-Debye relaxation polarization process of the composite film under different frequencies is studied,while the effects of CQDs doping on relaxation time and relaxation distribution parameter are also analyzed.Furthermore,the impacts of these two factors on the electro-optical properties of the films are explored.Under the synergistic regulation of CQDs mass fraction and exposure intensity,the effects of PDLC's dielectric properties and scattering performance on the film's fluorescence performance are investigated.The experimental results show that:when the CQDs doping amount is 0.2%(mass fraction),compared with undoped PDLC,the relaxation time of the PDLC composite film decreases by 56%,and the threshold voltage and saturation voltage decrease by 19.9%and 11.8%respectively,and the on-state and off-state switching response times decrease from 32 ms and 50 ms to 10 ms respectively;when the exposure intensity decreases from 30 mW/cm2 to 1 mW/cm2,the peak fluorescence intensity of PDLC increases by approximately 130%.This work effectively realizes the synergistic improvement of electro-optical properties and fluorescent characteristics of PDLC,providing valuable insights for the development of PDLC composite materials.