Polyvinyl alcohol (PVA)/carmine dye polymeric composite films are prepared by a solution casting method. Pure PVA, 0.11 wt% carmine dye/PVA, 0.55 wt% carmine dye/PVA, 1.11 wt% carmine dye/PVA, 5.5 wt% carmine dye/PVA, 11.11 wt% carmine dye/PVA and 27.775 wt% carmine dye/PVA have a semi-crystalline structure. The transmission spectrum shows that the light is blocked till 600 nm for 27.775 wt% carmine dye/PVA composite films. The transmittance for the composite 27.775 wt% carmine/PVA is reduced to 61%. The absorption bands and band edges were shifted due to the increase of carmine dye percentage in the PVA matrix. The direct bandgap decreased from 5.16 to 1.65 eV as the carmine dye percentage increased.The indirect band gap decreased from 4.75 to 0.99 eV. The refractive index is strongly dependent on the amount of carmine dye on PVA, and the refractive index increased up to 8. The optical conductivity of PVA/carmine dye composites was divided into different stages according to the photon energy. The highest values of the dielectric loss for PVA/carmine dye composites were found at the lowest frequency (100 Hz). PVA/carmine dye composite films are promising standing up filters for laser power attenuation and optoelectronic devices.

聚乙烯醇（PVA）/胭脂红染料聚合物复合膜是通过溶液流延法制备的。纯PVA，0.11 wt％胭脂红染料/PVA、0.55 wt％胭脂红染料/PVA、1.11 wt％胭脂红染料/PVA、5.5 wt％胭脂红染料/PVA、11.11 wt％胭脂红染料/ PVA和27.775 wt％胭脂红染料/ PVA具有半结晶结构。透射光谱表明，对于27.775 wt％的胭脂红染料/ PVA复合膜，光被阻挡到600 nm。复合物27.775 wt％胭脂红/ PVA的透射率降低至61％。由于PVA基质中胭脂红染料百分比的增加，吸收谱带和谱带边缘发生偏移。随着胭脂红染料百分比的增加，直接带隙从5.16降至1.65 eV;间接带隙从4.75降至0.99 eV。折射率强烈取决于PVA上胭脂红染料的量，折射率增加到8。PVA /胭脂红染料复合材料的光导率根据光子能量分为不同的阶段。发现PVA /胭脂红染料复合材料的介电损耗最高，频率最低（100 Hz）。PVA /胭脂红染料复合膜有望用于激光功率衰减和光电器件的立式滤光片。