High brightness circularly polarized electroluminescence from conjugated polymer F8BT induced by chiral binaphthyl-pyrene

Abstract

Chiral organic polymers have considerable potential in solution-processable circularly polarized organic light emitting diodes (CP-OLEDs) due to features simple, low cost and large-area processing. Achiral conjugated poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]-thiadiazol-4,8-diyl)] (F8BT) is a...

Controllable Circularly Polarized Electroluminescence Performance Improved by the Dihedral Angle of Chiral-Bridged Binaphthyl-Type Dopant Inducers

“…Materials were used directly without further purification. All NMR spectra, thermal, photophysical, electrochemical, and chiroptical properties of inducers ( R / S -1 to R / S -9 ) were measured using the apparatus previously described in the reference . All [α] D 25 values of these inducers were measured in CH 2 Cl 2 ( c = 0.1).…”

“…R / S -M1 was synthesized according to the reference . Compound R / S -6 were synthesized according to the literature to afford R / S -6 as two white solids. R -6 : 58% yield.…”

“…Narazaki et al researched the different substituent effects of bridged binaphthyl-type chiral dopants in dopant-induced chiral liquid crystals . In 2020, we constructed the induced-type CP-OLED devices from achiral fluorescence F8BT, and the CP-EL performance was greatly improved by using a pair of chiral binaphthyl-based inducers with excellent carrier mobility of pyrene moiety . Herein, a series of chiral binaphthyl-based enantiomers were synthesized by inserting different bridged alkyl chains into the hydroxyl groups of BINOL and were exploited to act as the chirality inducers ( R / S -1 to R / S -5 , Scheme ) to fabricate CPL-active luminescent layers.…”

“…28 In 2020, we constructed the induced-type CP-OLED devices from achiral fluorescence F8BT, and the CP-EL performance was greatly improved by using a pair of chiral binaphthyl-based inducers with excellent carrier mobility of pyrene moiety. 29 Herein, a series of chiral binaphthyl-based enantiomers were synthesized by inserting different bridged alkyl chains into the hydroxyl groups of BINOL and were exploited to act as the chirality inducers (R/S-1 to R/S-5, Scheme 1) to fabricate CPL-active luminescent layers. Moreover, we further investigated the influence on their CPL behavior and inducing ability by using these excellent carrier mobility chirality inducers modified by steric hindrance substituents on the 3,3′-position of the chiral binaphthyl moiety (R/S-6 to R/S-9, Scheme 1).…”

Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications

“…Besides, the essential mechanism of CPL generation is still open to discussion. In particular, only sporadic examples concerning the application of polymer-based CPL materials have been reported so far [168][169][170]; and so how to promote their practical applications is of significant importance and needs more efforts.…”