Circularly Polarized Luminescence Induced by Chiral Super Nanospaces

• Published in: Advanced functional materials 2019-08, Vol.29 (35), p.n/a
• Main Authors: Kim, Byeong‐Cheon, Choi, Hyeon‐Joon, Lee, Jae‐Jin, Araoka, Fumito, Choi, Suk‐Won
• Format: Article
• Language: English
• Subjects: achiral molecules; Chirality; Circular polarization; circularly polarized luminescence; Dyes; Fluorescent dyes; helical nanofilaments; liquid crystallinity; Luminescence; Materials science; Mesophase; Superstructures
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201903246

A simple methodology is developed to realize chiroptical function induced through superstructural chirality of a matrix of helical nanofilaments formed by achiral molecules. In this work, circularly polarized luminescence is demonstrated in nanosegregated mesophase comprising only achiral molecules. An achiral molecular mixture of a bent‐core host and a rod‐like guest blended with a fluorescent dye is prepared. Circularly polarized luminescence confirms that the chiral superstructure consisting only of achiral molecules may serve as a chiral super nanospace for inducing chiral emissions from the fluorescent dye that exhibits rod‐like molecular ordering. In other words, the formation of a chiral superstructure by the segregated rod‐like molecules embedded in helical nanofilaments (bent‐core molecules) is confirmed. The results provide a novel strategy for constructing dissymmetric circularly polarized luminescence materials based on achiral molecules, which is potentially applicable in future information and display technologies. Circularly polarized luminescence (CPL) from a nanosegregated mesophase consisting of only achiral molecules is demonstrated in this work. CPL is induced through self‐assembled chiral aggregates (in chiral super nanospace) formed only by achiral molecules. The results introduce the possibility of developing a novel technique for constructing practical CPL‐active materials.