液晶-氧化锌纳米复合材料的可调发光

采用超声波分散技术，选用氧化锌纳米晶体和液晶（N-（4-methoxybenzylidene）-4-ethoxybenzenamine），制成液晶质量分数分别为10%、20%、30%、40%、50%、60%、70%、80%的液晶-氧化锌纳米复合材料。通过X射线衍射仪、透射电子显微镜、光致发光光谱仪对样品进行表征。实验结果表明：当液晶MB₂BA在氧化锌纳米晶体的质量分数从0增加到80%时，氧化锌纳米复合材料的PL光谱峰值最终移到了418 nm的蓝光区域。随着氧化锌纳米晶体中液晶分子的增加，氧化锌纳米晶体的表面缺陷减少、其深层发光明显削弱，氧化锌纳米晶体的光致发光可以由最初的黄绿色转变为蓝色。因此，可以在氧化锌纳米晶体中通过添加适量的液晶MB₂BA来实现蓝光发射。

Tunable Emission Colours from Liquid Crystal/ZnO Nanocomposites

MB₂BA/ZnO nanocomposites with different mass fraction of liquid crystal N-(4-methoxybenzylidene)-4-ethoxybenzenamine(MB₂BA) were successfully prepared by ultrasonic dispersing technology. The prepared MB₂BA/ZnO nanocomposites were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM) and photoluminescence(PL) spectroscopy, respectively. The experimental results show that the UV emission of ZnO nanocrystals and PL of the MB₂BA is about to form a blue emission band with its peak located at about 418 nm when the concentration of MB₂BA in ZnO is up to 80%. By increasing the concentration of MB₂BA in ZnO nanocrystals, deep-level luminescence obviously weakened with reducing the surface defects of the ZnO nanocrystals, and the originally yellow-green photoluminescence of the ZnO nanocrystals can be tuned to blue. Our results demonstrate that the blue colored photoluminescence can be achieved by mixing appropriate amount of MB₂BA with ZnO nanocrystals.