【摘要】 本文研究了碳量子点（Carbon Quantum Dots,CQDs）纳米材料掺杂对聚合物分散液晶（Polymer Dispersed Liquid Crystal,PDLC）复合材料的形貌结构、极化机制及荧光调控效果的影响。基于PDLC薄膜的微观形貌结构，分析其对液晶微滴尺寸的影响。通过介电测量数据及Cole-Cole图，研究该复合薄膜在不同频率下CQDs诱导的非德拜弛豫极化过程，同时分析CQDs掺杂对弛豫时间、弛豫分布参数的影响。研究了两者对薄膜电光性能的影响。在CQDs质量分数与曝光强度的协同调控下，研究了PDLC的介电特性与散射性能对薄膜荧光性能的影响。实验结果表明，当CQDs掺杂质量分数为0.2%时，与未掺杂的PDLC样品相比，PDLC复合薄膜的弛豫时间降低56%，阈值电压和饱和电压分别降低19.9%和11.8%，开关态响应时间分别从32 ms和50 ms降低到10 ms；当曝光强度从30 mW/cm~2降低到1 mW/cm~2时，PDLC的荧光强度峰值提升约130%。有效实现了电光性能与荧光特性的协同提升，为开发PDLC复合材料提供了有价值的参考。更多还原

【Abstract】 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 electrooptical 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/cm~2 to 1 mW/cm~2, 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.更多还原