Full-color-tunable Chiral Aggregation-induced Emission Fluorophores with
Tailored Propeller Chirality and their Circularly Polarized Luminescence
Abstract
The regulation of emission color, emission efficiency and asymmetry
factor is of great significance for the real applications of circularly
polarized luminescent (CPL) materials. Herein, we develop a modular
synthetic strategy toward full-color-tunable CPL materials based on
chiral macrocyclic aggregation-induced emission (AIE) luminogens via
delicate molecular engineering. Modular synthesis of chiral AIEgens with
different acceptor moieties has afforded series of bright solid emitters
with tunable emission colors. These chiral cyclic AIEgens have retained
high solid state emission quantum yield and displayed CPL emission from
blue to red as nano-aggregates, in liquid crystal matrix and polymer
film. The strong acceptor units in the red-emitting chiral AIEgens
RBTPE-2CN and SBTPE-2CN have rendered them twisted
intramolecular charge transfer property and solvatochromic luminescence.
And polymer matrix with different polarity further facilitates the
tuning of CPL emission color from green to red emission. These results
have paved a reliable approach toward constructing full-spectra
solid-state CPL material.