Switchable circular polarized phosphorescence enabled by cholesteric assembled nanocelluloses

Wang, Xi; Miao, Qing; Zhang, Wenjing; Zhou, Yi; Xiong, Rui; Duan, Yingying; Meng, Xiao; Ye, Chunhong

doi:10.1016/j.cej.2023.148463

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…In contrast to the conventional physical method using a quarter waveplate and linear polarizer, the direct generation of circularly polarized light by CPL materials offers advantages such as eliminating the need for complex devices and avoiding energy loss during the conversion process. 1,2 Recently, CPL materials have garnered significant attention due to their diverse applications in information storage/encryption, 3–6 display devices, 7–10 chiral sensing, 11–13 and more. To successfully obtain CPL-active materials, a chiral component and luminescent component are two necessary elements of the system.…”

Section: Introductionmentioning

confidence: 99%

Helical columnar phase of mesogen-jacketed liquid crystal polymers for efficient circularly polarized luminescence

Liu,

Deng,

Fan

et al. 2024

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

Helical columnar phase of mesogen-jacketed liquid crystal polymers for efficient circularly polarized luminescence

Liu,

Deng,

Fan

et al. 2024

J. Mater. Chem. C

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“…Attributed to the promising applications in many fields such as 3D display, information encryption, and asymmetric synthesis, − chiral luminescent materials with circularly polarized luminescence (CPL) properties have been widely reported in recent years. Typically, CPL materials consist of chiral and chromophore components that interact in various ways. − To date, many strategies have been developed to prepare high-performance CPL materials with high luminescence quantum yield and a large luminescence asymmetry factor ( g lum ), such as construction of chiral luminescent liquid crystals, , chiral supramolecular assembly, − fluorescence resonance energy transfer (FRET), , and so forth.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Mesogen-Jacketed Liquid Crystal Copolymers with Long-Lived Circularly Polarized Room-Temperature Phosphorescence

Liu,

Deng,

Huang

et al. 2024

ACS Appl. Polym. Mater.

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Circularly polarized phosphorescence (CPP) materials, integrating the advantages of phosphorescence with circularly polarized luminescence, show wide applications in many fields. However, designing and preparing pure organic CPP materials remain challenging, as ensuring the stability of triplet excitons at room temperature while achieving chiral transfer from chiral structures to achiral chromophores is difficult. Herein, we propose a strategy to harness the structural features of mesogen-jacketed liquid crystal polymers (MJLCPs) for CPP material construction. A chiral monomer MJ0Chol and a phosphorescent monomer MJ0DFM are polymerized to prepare the homopolymers PMJ0Chol and PMJ0DFM and copolymers DFM(x)-Chol(y). The phosphorescence lifetime is effectively enhanced by the "jacketing" effect of MJLCPs, and the circularly polarized luminescence is activated through the construction of a chiral helical columnar phase. With the content of the MJ0DFM component increasing, the lifetime of copolymers gradually improves. Meanwhile, the |g lum | values of the samples exhibit an initial increase followed by a decrease with an increasing cholesterol content. DFM(0.6)-Chol(0.4) shows the highest g lum values for both fluorescence and phosphorescence, reaching −4.4 × 10 −3 and −7.1 × 10 −3 , respectively. Meanwhile, the phosphorescence lifetime can be achieved at 252 ms.

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Pressure‐Induced Inversion of Chiroptical Properties in Cholesteric Assembled Cellulose Nanocrystals

Meng,

Wang,

Bukharina

et al. 2024

Advanced Optical Materials

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Dynamic manipulation of the chiroptical effect, particularly the inversion of chiral signal, has attracted broad attention, but still remains challenging, Here, stepwise tuning of the helicoidal assembly and chiroptical properties of the cellulose nanocrystal (CNC) films utilizing high pressure are demonstrated. With in situ monitoring, the changes of Fourier‐transform infrared (FTIR) spectra and evaluating the corresponding applied energy, three distinctive stages of chiroptical properties are clearly identified. In these stages, the photonic bandgap of the CNC film exhibits a fast‐slow–fast alteration over different energy imposed. The three stages are associated sequentially with interlayer space reduction, hydrogen bonding reconfiguration, and covalent bands changing. A switch of chiral signal from left‐ to right‐handedness is observed in the third stage, and the handedness of CD spectra can be recovered upon release, which is barely observed. This unique property is suspected to be the change in CNCs assembly induced by molecular‐level conformational change. This work sheds light on the fundamental understanding of how pressure can trigger the change from molecular‐level to hierarchical assembly and corresponding chiroptical performance, facilitating the design of chiral assembly with pre‐programmed triggering chiroptical properties of bio‐photonic materials.

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Switchable circular polarized phosphorescence enabled by cholesteric assembled nanocelluloses

Cited by 4 publications

References 42 publications

Helical columnar phase of mesogen-jacketed liquid crystal polymers for efficient circularly polarized luminescence

Helical columnar phase of mesogen-jacketed liquid crystal polymers for efficient circularly polarized luminescence

Synthesis and Properties of Mesogen-Jacketed Liquid Crystal Copolymers with Long-Lived Circularly Polarized Room-Temperature Phosphorescence

Pressure‐Induced Inversion of Chiroptical Properties in Cholesteric Assembled Cellulose Nanocrystals

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