ABSTRACT

CsPbBr₃/SiO₂ perovskite quantum dots (PQDs), which exhibit good stability in water, air, and light, are synthesised using the water-trigger method. Due to the interaction between the long alkyl ligands of the PQDs and the liquid crystal, the liquid-crystal molecules prefer to align perpendicular to the surface of the PQDs, which disturbs the liquid crystal order and decreases its clearing point. The effect of CsPbBr₃/SiO₂ PQDs on the electro-optical properties and physical parameters of a nematic liquid crystal are investigated. The dielectric anisotropy (Δε) and splay elastic constant (K₁₁) decrease substantially with increasing concentration of PQDs. PQDs, which are doped into the liquid crystal, can effectively reduce the threshold voltage (V _th), which opens possibilities to reduce energy consumption in many optoelectronic devices.

摘要

使用水触发法合成了在水，空气和光中表现出良好稳定性的CsPbBr ₃ / SiO ₂钙钛矿量子点（PQDs ）。由于PQD的长烷基配体与液晶之间的相互作用，液晶分子倾向于垂直于PQD的表面排列，这会扰乱液晶顺序并降低其透明点。研究了CsPbBr ₃ / SiO ₂ PQDs对向列液晶的电光性质和物理参数的影响。介电常数各向异性（Δε）和弹性弹性常数（K ₁₁）随着PQD浓度的增加而大大降低。掺杂到液晶中的PQD可以有效地降低阈值电压（V _th），这为减少许多光电设备的能耗开辟了可能性。