Boosting Circularly Polarized Luminescence of Organic Conjugated Systems
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            Twisted Intramolecular Charge Transfer

Li, Junfeng; Hou, Chenxi; Huang, Chao; Xu, Shuqiang; Peng, Xuelei; Qi, Qi; Lai, Wen‐Yong; Huang, Wei

doi:10.34133/2020/3839160

Cited by 39 publications

(46 citation statements)

References 48 publications

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“…Chiral materials possessing CPL properties, which represent the different emissions of left‐ and right‐handed circularly polarized light, have attracted significant recent attention. [ 11–19 ] The detection, recording, and analysis of CPL signals of chiral materials are convenient, and these materials can be extensively applied in various fields. [ 20–26 ] One method for developing photoresponsive CPL switches involves covalently combining photochromic molecules with a chiral moiety.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Light‐Responsive Upconversion‐and‐Downshifting‐Based Circularly Polarized Luminescent Switches in Chiral Metal–Organic Frameworks

et al. 2021

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Metal–organic frameworks (MOFs) have attracted tremendous attention for several novel applications. However, functional MOFs with light‐responsive circularly polarized luminescence (CPL) are not examined in detail. Therefore, a dual CPL switch exhibiting both upconversion (UC) and downshifting (DS) CPL in the solid state is constructed by loading a luminescent diarylethene derivative (DAEC) and UC nanoparticles (UCNPs) into chiral MOFs. The chiral MOF⊃DAEC composites exhibit both photoswitchable luminescence and DS‐CPL properties under alternating UV and visible light irradiation. Additionally, a reversible UC‐CPL switch is realized using near‐infrared (NIR) and visible light irradiation by introducing energy‐level‐matched UCNPs and DAEC into the chiral MOFs. The dissymmetry factor (glum) of UC‐CPL is noted to be significantly amplified through energy transfer compared to that of DS‐CPL, which indicates that the information on circular polarization can be manipulated by altering the incident light. A chiroptical logic circuit with a 2D information output is designed with UV, visible, and NIR light as inputs by setting a rational threshold.

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Section: Introductionmentioning

confidence: 99%

Multi‐Light‐Responsive Upconversion‐and‐Downshifting‐Based Circularly Polarized Luminescent Switches in Chiral Metal–Organic Frameworks

et al. 2021

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“…Manipulation of light is in high demand for applications ranging from broadband reflectors to optical diodes. [1][2][3][4][5][6][7][8] Among the wide range of optical materials developed so far, photonic crystals with periodic modulation of dielectric functionality display remarkable ability to manipulate light propagation due to photonic bandgaps (PBG). [9][10][11][12][13] Chiral nematic phases are attractive as self-organized, one-dimensional photonic crystals with periodic layered structures and one-dimensional PBG that promise to be useful in photonic technologies.…”

Section: Introductionmentioning

confidence: 99%

Optically Ambidextrous Reflection and Luminescence in Self-Organized Left-Handed Chiral Nematic Cellulose Nanocrystal Films

et al. 2021

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Defect-embedded chiral nematic organizations are attractive due to their light manipulation ability that is crucial for photonic applications. Self-assembly of cellulose nanocrystals (CNC) forms a left-handed chiral nematic structure, which makes simultaneous reflection of left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) light a challenging task. Herein, we present unprecedented evidence that self-organized CNC films with left-handed helical sense and photonic bandgaps (PBG) display ambidextrous CP light reflection with peak reflectivity up to 68% and transform spontaneous photoluminescence to RCP and LCP luminescence with respective |g lum | values up to 0.796 and 0.120. These ambidextrous chiroptical properties originate from a left-handed chiral nematic structure consisting of a nematic-like phase, acting as a half-wave retarder, sandwiched between two PBG layers. The latter are spontaneously intercalated into the left-handed helicoids by rapid gelation of CNC colloidal suspensions. We demonstrate that the ambidextrous chiroptical properties can be manipulated by changes in evaporation temperatures, concentrations, and characteristics of CNC suspensions. We showcase the potential of defect-embedded chiral nematic CNC films for the sustainable and scalable development of anti-counterfeiting optical labels.

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“…To date, various smart luminescent materials, including semiconductor nanocrystals [ 6 , 7 ], dyes [ 8 ], lanthanide-doped nanoparticles [ 9 , 10 ], carbon dots [ 11 , 12 ], and transition-metal complexes [ 13 , 14 ], have been explored. However, spontaneous emission from such materials usually produces broad photoluminescence (PL) bands, which are prone to be overlapped and result in the limited coding capacity [ 15 – 17 ]. Stimulated emission, which can generate discrete narrow lasing signals for easily distinguishable readout [ 18 , 19 ], shows greater potential in the security field than conventional spontaneous emission [ 20 – 22 ].…”

Section: Introductionmentioning

confidence: 99%

Wavelength-Tunable Single-Mode Microlasers Based on Photoresponsive Pitch Modulation of Liquid Crystals for Information Encryption

Gong

Zhong

et al. 2020

Research

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Information encryption and decryption have attracted particular attention; however, the applications are frequently restricted by limited coding capacity due to the indistinguishable broad photoluminescence band of conventional stimuli-responsive fluorescent materials. Here, we present a concept of confidential information encryption with photoresponsive liquid crystal (LC) lasing materials, which were used to fabricate ordered microlaser arrays through a microtemplate-assisted inkjet printing method. LC microlasers exhibit narrow-bandwidth single-mode emissions, and the wavelength of LC microlasers was reversibly modulated based on the optical isomerization of the chiral dopant in LCs. On this basis, we demonstrate phototunable information authentication on LC microlaser arrays using the wavelength of LC microlasers as primary codes. These results provide enlightenment for the implementation of microlaser-based cryptographic primitives for information encryption and anticounterfeiting applications.

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Boosting Circularly Polarized Luminescence of Organic Conjugated Systems via Twisted Intramolecular Charge Transfer

Cited by 39 publications

References 48 publications

Multi‐Light‐Responsive Upconversion‐and‐Downshifting‐Based Circularly Polarized Luminescent Switches in Chiral Metal–Organic Frameworks

Multi‐Light‐Responsive Upconversion‐and‐Downshifting‐Based Circularly Polarized Luminescent Switches in Chiral Metal–Organic Frameworks

Optically Ambidextrous Reflection and Luminescence in Self-Organized Left-Handed Chiral Nematic Cellulose Nanocrystal Films

Wavelength-Tunable Single-Mode Microlasers Based on Photoresponsive Pitch Modulation of Liquid Crystals for Information Encryption

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