Nematic liquid crystals induce and amplify the circularly polarized luminescence of chiral TADF emitters

Zhu, Yingyu; Chen, Zhanxiang; Ao, Ying; Gong, Shaolong; Wang, Tao; Yang, Chuluo

doi:10.1039/d2tc00344a

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…Although circularly polarized lights can also be generated by a circular polarizer, some fluorescent dye‐doped Ch‐LC devices under irradiation could present completely different circularly polarized luminescence emission properties. [ 113 ] Especially, the easily adjustable molecular orientation or helical pitch endows the fluorescent dye‐doped Ch‐LC devices with interesting response characteristics, giving rise to better performance in energy consumption and modulation of emission range. [ 114 ] The detailed progress of circularly polarized luminescence in Ch‐LCs can be seen in the corresponding review articles.…”

Section: Fluorescent Dye‐doped Lc Devicesmentioning

confidence: 99%

Recent Progress in Functional Dye‐Doped Liquid Crystal Devices

Shen

Zhang

Miao

et al. 2022

Adv Funct Materials

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As a typical representative of dopants, organic functional dyes have demonstrated their significant roles in novel smart liquid crystal (LC) devices, and dye-doped LCs have also been a source of inspiration for scientists to design and fabricate stimuli-gated materials or devices for envisioned applications in a wide range of areas. In this review, the focus on dichroic dyes, fluorescent dyes, and photothermal dyes, and the recent progress of the LC devices employing these dyes as dopants are overviewed. The review highlights the developments of the novel LC devices doped with these dyes. The structures, designs, and applications of these devices are outlined. The underlying principles of dichroic dyes, fluorescent dyes, and photothermal dyes which are utilized as functional dopants in LC devices are first introduced. Subsequently, the novel developments of functional dye-doped LC devices in the application fields of smart windows, attenuators for augmented reality (AR) systems, color-changeable textiles, dichroic color filters, dual-mode circular polarizers, chirality detectors, optical limiters, switchable luminescent solar concentrators, multiple information encryption, anti-counterfeiting, photo-addressed transparent displays, circularly polarized luminescence, tunable lasers, and light-driven soft actuators are discussed. Finally, the challenge and the strategies for the future improvement of dye-doped LC devices are also discussed.

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Section: Fluorescent Dye‐doped Lc Devicesmentioning

confidence: 99%

Recent Progress in Functional Dye‐Doped Liquid Crystal Devices

Shen

Zhang

Miao

et al. 2022

Adv Funct Materials

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“…[31,32] Previous researches show that introducing fluorescent chromophores into chiral liquid crystals to obtain chiral fluorescent liquid crystals is an effective method to prepare CPL materials with large g lum values. [33][34][35][36][37] The large g lum values are mainly attributed to the unique chiral assembly process and selective reflection of chiral liquid crystals, [38] which can realize the amplification of g lum values. Circularly polarized phosphorescent materials and circularly polarized fluorescent materials have similar chiral transfer and amplification laws.…”

Section: Introductionmentioning

confidence: 99%

Strong and Multicolor‐Tunable Pure Organic Circularly Polarized Room‐Temperature Phosphorescence from Cholesteric Liquid Crystal

Gong

Huang

Yuan

et al. 2023

Advanced Optical Materials

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Pure organic circularly polarized room‐temperature phosphorescence (CPRTP) materials show significant promise for applications in advanced anti‐counterfeiting, biological imaging, and so on. However, it remains challenging to prepare CPRTP materials with a high phosphorescence luminescence dissymmetry factor (glum). This article provides a simple and efficient method to prepare pure organic CPRTP materials with high phosphorescence glum from cholesteric liquid crystals by incorporation of achiral phosphorescent chromophore dibenzofuran into chiral cholesterol mesogen via a flexible spacer. The findings show that the synthetic compound Chol‐C6‐DF can form cholesteric liquid crystals and can effectively amplify the glum value through selective reflection. The Chol‐C6‐DF film can produce yellow CPRTP when excited by a dibenzofuran chromophore. The glum value, the lifetime, and the quantum yield of the yellow CPRTP produced by dibenzofuran under the excitation of 380 nm light are −0.19, 567.7 ms, and 3.2%, respectively. Even more interesting is that the chiral cholesterol also exhibits RTP and clustering‐triggered emission characteristics. The glum value and the lifetime of red CPRTP produced by cholesterol under the excitation of 420 nm light are ‐0.11 and 1.11 s. Under excitation of 410, 430, and 470 nm light, the phosphorescent quantum yields are 19.0%, 20.2%, and 19.1%, respectively.

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“…Introduction of a second or a third constituent to form multiple component coassemblies endows with greater possibility to realize versatile structures and functions [15–27] . Noncovalent interactions including hydrogen bonding, halogen bonding, electrostatic attraction, van der Waals, π–π stacking, metal‐ligand coordination charge‐transfer and others were employed to integrate components to afford supramolecular complexes, whereby the asymmetrical packing and chiroptical features could be rationally manipulated [28–40] . Achiral entities intercalated into chiral building units to induce the emergence and inversion of supramolecular chirality [41, 42] .…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18][19][20][21][22][23][24][25][26][27] Noncovalent interactions including hydrogen bonding, halogen bonding, electrostatic attraction, van der Waals, π-π stacking, metal-ligand coordination charge-transfer and others were employed to integrate components to afford supramolecular complexes, whereby the asymmetrical packing and chiroptical features could be rationally manipulated. [28][29][30][31][32][33][34][35][36][37][38][39][40] Achiral entities intercalated into chiral building units to induce the emergence and inversion of supramolecular chirality. [41,42] Organic and inorganic luminescent species coassemble with chiral matrices enable the colorful circularly polarized luminescence (CPL) at full wavelength ranges.…”

Section: Introductionmentioning

confidence: 99%

Arene‐Perfluoroarene Force Driven Sublimation‐Removable Chiral Coassemblies

et al. 2023

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Multiple constituent coassembly is an emerging strategy to manipulate supramolecular chirality and chiroptical properties such as circularly polarized luminescence (CPL). However, the second or third constituent could not be removed from pristine self‐assembly. Here we developed a constitute‐removable chiral coassembly using sublimation that could realize coassembly with tunable supramolecular chirality, luminescence and CPL properties. Octafluoronapthalene (OFN) with small sublimation enthalpy formed coassemblies with perylene‐conjugated peptoids via arene‐perfluoroarene (AP) interaction that induced the emergence of macroscopic chirality and hypsochromic luminescence from yellow to green. Coassembly with OFN accelerated one‐dimensional growth and induced the emergence of macroscopic chirality and CPL. Despite the stability at ambient conditions, vacuum‐treatment triggered fast sublimation of OFN, which behaved as a sacrificial template. Physical removal of OFN retained the helical nanoarchitectures as well as the basic features of Cotton effects and CPL activities. X‐ray diffraction suggested the back‐fill consolidation occurred on the molecular voids by OFN removal that slightly varied the templated molecular arrangements. Sublimation of perfluorinated building units is green and efficient and non‐destructive, which is potentially applicable in constructing template‐directed chiroptical materials and devices.

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Nematic liquid crystals induce and amplify the circularly polarized luminescence of chiral TADF emitters

Abstract: This work reported a simple strategy that induces and amplifies glum value of chiral thermally activated delayed fluorescence (TADF) emitters by co-assembly with liquid crystals. Large glum values of +7.26...

Cited by 7 publications

References 25 publications

Recent Progress in Functional Dye‐Doped Liquid Crystal Devices

Recent Progress in Functional Dye‐Doped Liquid Crystal Devices

Strong and Multicolor‐Tunable Pure Organic Circularly Polarized Room‐Temperature Phosphorescence from Cholesteric Liquid Crystal

Arene‐Perfluoroarene Force Driven Sublimation‐Removable Chiral Coassemblies

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