Generation of full-color and switchable circularly polarized luminescence from nonchiral dyes assembled in cholesteric cellulose films

He, Jintao; Bian, Kaiqiang; Li, Na; Piao, Guangzhe

doi:10.1039/c9tc01956a

Cited by 81 publications

(74 citation statements)

References 33 publications

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“…As shown in Fig. 6d , the induced CPL could be generated via the co-assembly of achiral luminophore 52 and CNCs 102 . When the helical pitch of the film was about 530 nm, the composite film exhibited right-CPL owing to the selective reflection and PBGs effect.…”

Section: Cpl-active Organic Materials With Micro-/nano-structuresmentioning

confidence: 96%

Circularly polarized luminescence from organic micro-/nano-structures

et al. 2021

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Circularly polarized light exhibits promising applications in future displays and photonic technologies. Circularly polarized luminescence (CPL) from chiral luminophores is an ideal approach to directly generating circularly polarized light, in which the energy loss induced by the circularly polarized filters can be reduced. Among various chiral luminophores, organic micro-/nano-structures have attracted increasing attention owing to the high quantum efficiency and luminescence dissymmetry factor. Herein, the recent progress of CPL from organic micro-/nano-structures is summarized. Firstly, the design principles of CPL-active organic micro-/nano-structures are expounded from the construction of micro-/nano-structure and the introduction of chirality. Based on these design principles, several typical organic micro-/nano-structures with CPL activity are introduced in detail, including self-assembly of small molecules, self-assembly of π-conjugated polymers, and self-assembly on micro-/nanoscale architectures. Subsequently, we discuss the external stimuli that can regulate CPL performance, including solvents, pH value, metal ions, mechanical force, and temperature. We also summarize the applications of CPL-active materials in organic light-emitting diodes, optical information processing, and chemical and biological sensing. Finally, the current challenges and prospects in this emerging field are presented. It is expected that this review will provide a guide for the design of excellent CPL-active materials.

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Section: Cpl-active Organic Materials With Micro-/nano-structuresmentioning

confidence: 96%

Circularly polarized luminescence from organic micro-/nano-structures

et al. 2021

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“…The value of the g Lum at 460 nm (the wavelength corresponding to the maximum emission intensity) was 0.2, that is, significantly higher than the reported values for dye/CNC hybrids, e.g., g Lum of 3.3 × 10 −2 for pyrene/CNC hybrid obtained by Ch induction . Notably, the value of g Lum at 460 nm for C‐dot/CNC suspension was as high as some of the highest values reported for the Ch‐CNC composite films obtained from mixtures of CNCs with NPs (−0.2) or dyes (−0.28) . The origins of CPL in Ch‐CNC films and C‐dot/CNC suspension in our work is different: films effectively block L‐CPL transmission and emission, which results in R‐CPL emission with negative g Lum values, while in our work, the L‐CPL emission was stronger and g Lum was positive, due to the Ch induction or Ch nature of C‐dots themselves.…”

Section: Resultsmentioning

confidence: 66%

Chiral Carbon Dots Synthesized on Cellulose Nanocrystals

Chekini

Prince

Zhao

et al. 2019

Advanced Optical Materials

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Hybrid nanoparticles composed of cellulose nanocrystals (CNCs) and carbon‐dots (C‐dots) have promising applications in chemistry, biology, and nanomedicine, owing to the photoluminescence, sensory properties, and cytocompatibility of C‐dots, and chirality, cytobiocompatibility, and high cellular uptake of CNCs. The possibility of circularly polarized luminescence in such nanoparticles is particularly attractive. Herein, scalable and straightforward hydrothermal synthesis of nitrogen‐doped fluorescent C‐dots under reflux condition by using CNCs as a carbon source and chiral substrate is reported. Under ultraviolet irradiation, hybrid C‐dot/CNC nanoparticles exhibit stronger emission of left‐handed, than right‐handed, circularly polarized light, with high dissymmetry factor up to 0.2. The nanoparticles are biocompatible: the normalized proliferation index above 100% is determined for MCF 7 cells cultured in the suspension of C‐dot/CNC nanoparticles. These hybrid nanoparticles can find applications as biotags for labeling, sensing, and therapeutics and as building blocks of photoluminescent cholesteric CNC films with photonic applications.

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“…In most cases, variations in the pitch of the helix induced by external stimuli were the major cause for the changes in optical properties ( Figure 2A ). The inversion in the sign of CPL and the tuning of CPL wavelength could be achieved (Zheng et al, 2018 ; He et al, 2019 ). Moreover, suitably designed fluorescence resonance energy transfer (FRET) and charge transfer systems have also been used to tailor the CPL emission using * NLC templates (Li et al, 2020 ; Lin et al, 2020 ).…”

Section: Liquid Crystalsmentioning

confidence: 99%

“…(A) Liquid crystals: Schematic illustration represents the generation of R-CPL and L-CPL from CNC- fluorescent dyes composite film with respect to helical pitch change and their corresponding CPL spectra. Reproduced with permission from He et al ( 2019 ). Copyright (2019) The Royal Society of Chemistry.…”

Section: Liquid Crystalsmentioning

confidence: 99%

Template Assisted Generation of Chiral Luminescence in Organic Fluorophores

2021

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Development of efficient ways of fabricating chiral light emitting materials is an active area of research due to the vast potential offered by these materials in the field of optoelectronic devices, data storage, and asymmetric synthesis. Among the various methods employed, template assisted generation of chiral luminescence is gaining enormous attention due to its simplicity, applicability over a wide range of fluorescent molecules/dyes, and the display of high anisotropic values.

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Generation of full-color and switchable circularly polarized luminescence from nonchiral dyes assembled in cholesteric cellulose films

Abstract: The generation of full-color and switchable circularly polarized luminescence from nonchiral dyes assembled in cholesteric cellulose films.

Cited by 81 publications

References 33 publications

Circularly polarized luminescence from organic micro-/nano-structures

Circularly polarized luminescence from organic micro-/nano-structures

Chiral Carbon Dots Synthesized on Cellulose Nanocrystals

Template Assisted Generation of Chiral Luminescence in Organic Fluorophores

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