Physical properties of liquid crystals doped with CsPbBr3 quantum dots. Issue 10 (9th August 2021)

• Record Type: Journal Article
• Authors: Liu, Xuelian; Xia, Xiang; Yang, Le; Zhu, Jun; Xu, Miao; Zhang, Guobing; Xia, Guo; Qiu, Longzhen; Lu, Hongbo
• Is Part Of: Liquid crystals. Volume 48:Issue 10(2021)
• Page Start: 1357
• Page End: 1364
• Publication Date: 2021-08-09
• Subjects: Nematic liquid crystal -- CsPbBr3/SiO2 perovskite quantum dots -- alignment -- threshold voltage (Vth); Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2020.1870009
• Languages: English
• ISSNs: 0267-8292

Abstract

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. Graphical abstract: uf0001