Inverted and Amplified CP‐EL Behavior Promoted by AIE‐Active Chiral Co‐Assembled Helical Nanofibers

Geng, Zhongxing; Liu, Zheng; Li, Hang; Zheng, Wen‐Hua; Quan, Yiwu; Cheng, Yixiang

doi:10.1002/adma.202209495

Cited by 13 publications

(4 citation statements)

References 56 publications

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“…We found that the S-PB2, PTZ@S-PB2, and S-PT films had similar microstructures: from spherical aggregates (Figures 6a-d and S22a, b) to highly-ordered helical nanofibers (Figures 6e-h and S22c, d) which were formed during thermal anneal treatment, resulting in the reversed and amplified CPL emissions. [27] Compared with the SEM images of S-PT, PTZ@S-PB2 had more stereoregular spherical aggregates. Notably, spherical aggregates were found in annealed S-PT, which might reduce its negative CPL signals (Figure 6g and 6h).…”

Section: Resultsmentioning

confidence: 91%

Strong Circularly Polarized Luminescence Promoted by AIE‐active Chiral Co‐assemblies in Liquid Crystal Polymer Films

Li,

Luo,

Liu

et al. 2024

Chemistry A European J

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Recently, extensive works have focused on increasing the dissymmetry factors (glum) of various circularly polarized luminescence (CPL) materials, which is one of the most important factors for future applications of CPL. Herein, we designed a chiral co‐assembled liquid crystal polymer (LCP) PTZ@R/S‐PB2, which was prepared by chiral binary co‐polymer (R/S‐PB2) doped with achiral phenothiazine derivation dye (PTZ). For comparison, ternary co‐polymerized LCP (R/S‐PT) was synthesized by co‐polymerizing with mesogenic monomer, chiral monomer and emissive monomer. Both PTZ@R/S‐PB2 and R/S‐PT showed aggregation‐induced emission (AIE) properties. Interestingly, the CPL signals of both PTZ@R/S‐PB2 and R/S‐PT were reversed and amplified after thermal annealing treatment. The |glum| values of the co‐assembled PTZ@R/S‐PB2 were up to 0.13 at a 32 nm thickness, which was 5.4 times that of R/S‐PT (|glum| = 0.024). This is due to PTZ@R/S‐PB2 could form more orderly chiral co‐assembly structures. Noticeably, increasing the LCP film thickness could further improve the glum value, and the maximum glum of PTZ@R/S‐PB2 could be enhanced to 0.91 at a 220 nm thickness.

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Section: Resultsmentioning

confidence: 91%

Strong Circularly Polarized Luminescence Promoted by AIE‐active Chiral Co‐assemblies in Liquid Crystal Polymer Films

Li,

Luo,

Liu

et al. 2024

Chemistry A European J

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“…Before thermal annealing (panels a and b of Figure ), both R / S -3–LC-P and R / S -6–LC-P exhibit a weak induced CD band of LC-P in the chiral inducer weight percent range of 2.5–25%. Interestingly, the induced CD bands of these chiral co-assemblies can be greatly enhanced after being annealed at 150 °C, suggesting that suitable thermal annealing treatment can promote higher order orientation of chiral co-assemblies . The strongest mirror-image-induced CD signals can be observed from ( R / S -3) 0.05 –(LC-P) 0.95 and ( R / S -6) 0.1 –(LC-P) 0.9 when the weight-doping ratios of R / S -3 and R / S -6 are 5 and 10 wt %, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Interestingly, the induced CD bands of these chiral co-assemblies can be greatly enhanced after being annealed at 150 °C, suggesting that suitable thermal annealing treatment can promote higher order orientation of chiral co-assemblies. 50 The strongest mirror-image-induced CD signals can be observed from (R/S-3) 0.05 −(LC-P) 0.95 and (R/S-6) 0.1 −(LC-P) 0.9 when the weightdoping ratios of R/S-3 and R/S-6 are 5 and 10 wt %, respectively. It is worth noting that the induced CD signal of (R/S-3) 0.05 −(LC-P) 0.95 is much higher than that of (R/S-6) 0.1 −(LC-P) 0.9 , which indicates that a more efficient intermolecular chiral induction can occur from chiral inducer R/S-3 to achiral LC-P during the chiral co-assembly process (panels e and f of Figure 2).…”

Section: ■ Experimental Sectionmentioning

confidence: 95%

Amplified Circularly Polarized Luminescence Behavior in Chiral Co-assembled Liquid Crystal Polymer Films via the Strategic Manipulation of Chiral Inducers

Chu,

Song,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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One of the most important factors for the future application of circularly polarized luminescence (CPL) materials is their high dissymmetry factors (g em ), and more and more studies are working tirelessly to focus on increasing the g em value. Herein, we chose an achiral liquid crystal polymer (LC-P) and two chiral binaphthyl-based inducers (R/S-3 and R/S-6) with different substitution positions (3,3′ positions for R/S-3 and 6,6′ positions for R/S-6) to construct chiral co-assemblies and explored their induced amplification CPL behaviors. Interestingly, after the thermal annealing treatment, this kind of chiral co-assembly (R/S-3) 0.05 −(LC-P) 0.95 can emit a superior CPL signal (|g em | = 0.31 and λ em = 424 nm), which achieves about 13-fold signal amplification in the spin-coated film, compared to (R/S-6) 0.1 −(LC-P) 0.9 (|g em | = 0.023 and λ em = 424 nm). This is because (R/S-3) 0.05 −(LC-P) 0.95 could further co-assemble to form a more ordered arrangement LC state and generate regular helix nanofibers than that of (R/S-6) 0.1 −(LC-P) 0.9 . This work provides an efficient method for synthesizing high-quality CPL-active materials through the strategic manipulation of the structure of chiral binaphthyl-based inducers in chiral co-assembled LCP systems.

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“…The conventional approach for fabricating circularly polarized OLEDs mainly focuses on the design and synthesis of efficient organic materials with circularly polarized luminescence, which are subsequently utilized as the emitting centers in light-emitting layers (EMLs) [10][11][12] . Alternatively, circularly polarized OLEDs can also be obtained based on chirality-induction strategy of blending a chirality inducer with emitting materials during the preparation of the EMLs [13][14][15] . Essentially, the chiral nature of these devices originates from the chiral emitting materials or the chiral environments in EMLs [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Spin-polarized white organic light-emitting diodes based on chirality-induced spin selectivity effect

Xu,

Qiu,

Peng

et al. 2024

Preprint

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Chirality-induced spin selectivity (CISS) effect refers to charge carriers become spin-polarized when traversing through chiral materials, but this unique phenomenon has never been reported for organic light-emitting diodes (OLEDs). Herein, robust chiral near-ultraviolet and deep-blue materials with wide energy gaps are explored and demonstrated to possess CISS effect. By aligning a chiral deep-blue layer next to an achiral green layer in OLEDs, spin-polarized charge carriers are generated from the chiral layer and get recombined to form spin-polarized excitons in the adjacent achiral green layer, furnishing green circularly polarized electroluminescence (CP-EL). Furthermore, by incorporating multiple achiral sky-blue, green and red layers with chiral near-ultraviolet or deep-blue layers, complex three-emitting-layer or four-emitting-layer spin-polarized white OLEDs are realized, providing distinct CP-EL signals from different achiral emitting layers simultaneously and outstanding EL performance with excellent external quantum efficiencies reaching 26.6% and high color rendering indexes of 94, much superior to the performances of the reported white OLEDs with circularly polarized light so far. This work introduces CISS effect into OLEDs for achieving CP-EL for the first time, and virtually presents a novel and feasible approach towards high-performance circularly polarized white OLEDs with a single organic chiral layer.

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Inverted and Amplified CP‐EL Behavior Promoted by AIE‐Active Chiral Co‐Assembled Helical Nanofibers

Abstract: Scheme 1. a) Structures of L/D-HP and NTi; b) Schematic diagram of the possible initial chiral co-assembly route of L-HP-NTi; c) Schematic diagram of the possible helical chiral co-assembly route of L-HP-NTi; d) Device configuration of the CP-OLEDs.

Cited by 13 publications

References 56 publications

Strong Circularly Polarized Luminescence Promoted by AIE‐active Chiral Co‐assemblies in Liquid Crystal Polymer Films

Strong Circularly Polarized Luminescence Promoted by AIE‐active Chiral Co‐assemblies in Liquid Crystal Polymer Films

Amplified Circularly Polarized Luminescence Behavior in Chiral Co-assembled Liquid Crystal Polymer Films via the Strategic Manipulation of Chiral Inducers

Spin-polarized white organic light-emitting diodes based on chirality-induced spin selectivity effect

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