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Self-Assembled Nanohelix for White Circularly Polarized Luminescence via Chirality and Energy Transfer
摘要： Chiral nanostructures and their optical activity have been attracting great interest. Here, we designed enantiomer bolaamphiphile containing a naphthalene moiety (bola-1) and alkyl spacer, and investigated their self-assembly as well as optical activity. It was found the compound could form gels in various organic or mixed organic/water mixtures. In mixed DMSO/water, it formed nanohelix. Due to the fluorescent nature of the naphthyl group, the nanohelix showed both CD and circularly polarized luminescence (CPL). When three achiral fluorescent molecules, pyrene-1-carboxylic acid (D2), rhodamine 110 (D3) and rhodamine B (D4), were incorporated into the helical structures formed by bola-1, the nanohelix could be remained and the CPL from the dye molecules could be induced. In addition, an energy transfer occurred between the bola-1 nanohelix and the dyes. By mixing the different emission dyes with the bola-1 in an appropriated ratio, a white CPL was obtained. It was found the dissymmetry factor of the white CPL could be increased through the energy transfer. This work provided a new convenient and efficient way of fabricating while CPL.
关键词： nanohelix,white CPL,circularly polarized luminescence,energy transfer,optical activity,Chiral nanostructures,bolaamphiphile
更新于2025-09-19 17:13:59
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Preorganized helical chirality controlled homochiral self-assembly and circularly polarized luminescence in a quadruple-stranded Eu2L4 helicate
摘要： The homochiral quadruple-stranded helicate, ΔΔ-(Eu2L4) assembled from the bis-β-diketone with the preorganized helical chirality shows strong circularly polarized luminescence.
关键词： preorganized helical chirality,circularly polarized luminescence,homochiral,bis-β-diketone,quadruple-stranded helicate
更新于2025-09-19 17:13:59
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Rational Design of Axially Chiral Platinabinaphthalenes with Aggregation-Induced Emission for Red Circularly Polarized Phosphorescent Organic Light-Emitting Diodes
摘要： Circly polarized luminescent (CPL) materials have received great interest due to their potential applications in next-generation displays. However, the development of easily accessible red circularly polarized phosphorescent emitters for practical organic light-emitting diodes fabrication remains a grand challenge. In this paper, we report a new family of CPL-active platinum complexes based on the binaphthalene chiral platform. These axially chiral platinabinaphthalenes were facile synthesized by directly incorporating platinum(II) into the π-conjugated backbone of commercially available enantiopure binaphthalene derivate. These complexes exhibit aggregation-induced circularly polarized phosphorescence enhancement with high quantum yields up to 66% and luminescence dissymmetry factors around 2.6×10?3. Moreover, solution-processable circularly polarized organic light-emitting diodes (CPOLEDs) using these complexes as emitters show good performance with the maximum luminance up to 3500 cd m2 and dissymmetry factor values around 1.0×10?3. These findings by rational design of axially chiral platinabinaphthalenes are important for the development of high-performance CPL complexes for CPOLEDs.
关键词： circularly polarized luminescence,binaphthalene,organic light-emitting diode,platinum complex,aggregation-induced emission
更新于2025-09-16 10:30:52
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Finely Controlled Circularly Polarized Luminescence of a Mechano-Responsive Supramolecular Polymer
摘要： We report on finely controlled circularly polarized luminescence (CPL) supramolecular polymerization based on a tetraphenylethene core with four L- or D-alanine branch side chains (L-1 and D-1) in the solution state resulting from the tuning of mechanical stimulus. Weak, green emissions of L-1 and D-1 in tetrahydrofuran (THF) were converted to strong blue emissions by tuning the mechanical stimulus. The strong blue emissions were caused by an aggregation-induced emission (AIE) effect during the formation of a supramolecular polymer. Lag time in the supramolecular polymerization was drastically reduced by the mechanical stimulus, which was indicative of the acceleration of the supramolecular polymerization. Interestingly, a significant enhancement of circular dichroism (CD) and CPL signals of the L-1 and D-1 was observed by tuning the rotational speed of the mechanical stimulus, which implies that the chiral supramolecular polymerization was accelerated by the mechanical stimulus. These results imply that the CPL signals were tuned by the strength of the external mechanical stimulus.
关键词： Helicity,AIE Effect,Mechano-Responsive Material,Circularly Polarized Luminescence,Supramolecular Polymerization
更新于2025-09-11 14:15:04
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Cooperative Chirality and Sequential Energy Transfer in Supramolecular Light-harvesting Nanotube
摘要： By constructing a supramolecular light-harvesting chiral nanotube in aqueous phase, we demonstrated the cooperative energy and chirality transfer that revealed some new aspects. It was found that a cyanostilbene-appended glutamate compound (CG) self-assembled into helical nanotubes exhibiting both supramolecular chirality and circularly polarized luminescence (CPL). When two achiral acceptors ThT and AO with different energy bands were co-assembled with the nanotube, the CG nanotube could transfer its chirality to both of the acceptors. The excitation energy could be transferred to ThT but only be sequentially transferred to AO. During such process, the CPL ascribed to the acceptor could be sequentially amplified. This work provides a new insight into the understanding the cooperative chirality and energy transfer in a chiral supramolecular system, which is more similar to the natural light-harvesting antennas.
关键词： Supramolecular chirality,Energy transfer,Light-harvesting,Circularly polarized luminescence,Supramolecular nanotube
更新于2025-09-10 09:29:36
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Cooperative Chirality and Sequential Energy Transfer in Supramolecular Light-harvesting Nanotube
摘要： By constructing a supramolecular light-harvesting chiral nanotube in aqueous phase, we demonstrated the cooperative energy and chirality transfer that revealed some new aspects. It was found that a cyanostilbene-appended glutamate compound (CG) self-assembled into helical nanotubes exhibiting both supramolecular chirality and circularly polarized luminescence (CPL). When two achiral acceptors ThT and AO with different energy bands were co-assembled with the nanotube, the CG nanotube could transfer its chirality to both of the acceptors. The excitation energy could be transferred to ThT but only be sequentially transferred to AO. During such process, the CPL ascribed to the acceptor could be sequentially amplified. This work provides a new insight into the understanding the cooperative chirality and energy transfer in a chiral supramolecular system, which is more similar to the natural light-harvesting antennas.
关键词： Supramolecular chirality,Energy transfer,Light-harvesting,Circularly polarized luminescence,Supramolecular nanotube
更新于2025-09-09 09:28:46
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Determination of Handedness in a Single Chiral Nanocrystal via Circularly Polarized Luminescence
摘要： The occurrence of biological homochirality is attributed to symmetry breaking mechanisms which are still debatable. Studies of symmetry breaking require tools for monitoring the population ratios of individual chiral nano-objects, such as molecules, polymers or nanocrystals. Moreover, mapping their spatial distributions may elucidate on their symmetry breaking mechanism. While luminescence is preferred for detecting single particle chirality due to its high signal to noise ratio, the typical low optical activity of chromophores limits its applicability. Here, we report on handedness determination of single chiral lanthanide based luminescent nanocrystals with a total photon count of 2×104. Due to the large emission dissymmetry we could determine the handedness of individual particles using only a single circular polarization component of the emission spectrum, without polarization modulation. A machine learning algorithm, trained to several spectral lineshape features, enabled us to determine and spatially map the handedness of individual nanocrystals with high accuracy and speed. This technique may become invaluable in studies of symmetry breaking in chiral materials.
关键词： chiroptical activity,circularly polarized luminescence,lanthanide nanocrystals,single-particle spectroscopy
更新于2025-09-09 09:28:46
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Photon Upconverted Circularly Polarized Luminescence via Triplet-Triplet Annihilation
摘要： Circularly polarized luminescent materials are of increasing attention due to their potential applications in advanced optical technologies, such as chiroptical devices and optical sensing. Recently, in all reported circularly polarized luminescent materials, high-energy excitation results in low-energy or downconverted circularly polarized luminescence (CPL) emission. Although photon upconversion—i.e., the conversion of low-energy light into higher-energy emission, with a wide variety of applications—has been widely reported, the integration of photon upconversion and CPL in one chiral system to achieve higher-energy CPL emission has never been reported. Herein, a brief review is provided of recent achievements in photon-upconverted CPL via the triplet–triplet annihilation mechanism, focusing on the amplified dissymmetry factor glum through energy transfer process and dual upconverted and downconverted CPL emission through chirality and energy transfer process.
关键词： triplet–triplet annihilation,photon upconversion,energy transfer,triplet energy migration,circularly polarized luminescence
更新于2025-09-04 15:30:14