ACS Omega
·
2025
·
IF 4.3
Hongbo Zhao,Ling-Yan Xu,Xing-Yu Zhang,Renjun Pei,Pei-Xi Wang
The efficient generation of circularly polarized light (CPL) is crucial in information technologies such as optical communications and three-dimensional displays. In nature, many plants and animals can transform unpolarized light into CPL with chiral helical superstructures, which has inspired the development of CPL-related materials and devices. Herein, by combining the self-assembled chiral nematic liquid crystalline microstructures of cellulose nanocrystals with geometrical configurations of Fresnel lenses, free-standing solid-state cellulosic converging lenses with large sizes, circular polarization features, and adjustable chiral photonic bandgaps were fabricated at low cost, which could produce CPL beams exhibiting dissymmetry factors (g = 2(IL – IR)/(IL+ IR)) up to −0.61 ± 0.02 by focusing sunlight and generate real images of distant objects. These results may help guide the development of polarized light sources or imaging systems, and also suggest a simple method to construct multifunctional optical devices from photonic crystals.
研究领域:
光学材料
·
纳米技术
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiahang Wu,Dianbo Cao,Yang Lu,Xiao Yu,Yuhan Yang,Xu Zhao,Yan Xu,Xiaomin Liu,Geyu Lu
The combination of chiral photonic crystals and fluorescent nanomaterials has garnered significant attention due to their exceptional light modulation abilities and versatile stimulus-responsive characteristics. In this study, we present a flexible chiral photonic crystal fluorescent film composed of rod-shaped cellulose nanocrystals (CNCs) and orthogonal upconversion nanoparticles (OUCNPs). This composite film maintains the photonic order of the CNCs chiral matrix while preserving the orthogonal excitation-emission properties of OUCNPs, with fluorescence shifting from blue to red as the excitation wavelength changes from 980 nm to 808 nm. By adjusting ultrasonic energy, the photonic bandgap (PBG) of the composite film can be tuned, and the bandgap effect is found to reduce OUCNPs fluorescence emission. Furthermore, by altering factors such as the observation background, viewing angle, polarizer, humidity, and excitation wavelength, the composite film can transition between distinct optical states, effectively integrating stimulus-responsive chiral structural color with fluorescence and exhibiting a sophisticated quintuple stimulus–response functionality. Due to the film’s remarkable flexibility, its practical applications in multimodal anti-counterfeiting and humidity sensing are successfully demonstrated using a plant model. This work shows great potential for the development of innovative sensors with advanced environmental response capabilities.
研究领域:
材料科学
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光学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Ting Zhang,Chuanmei Tang,Yuefei Wang,Chaoxuan Wang,Yiwen Zhang,Wei Qi,Rongxin Su,Zhimin He
In this work, we studied the formation and properties of composite films coassembled by cellulose nanocrystals (CNCs) and bovine serum albumin-stabilized gold nanoclusters (BSA-AuNCs). The influences of the BSA-AuNC concentration on the structure and optical properties of CNC-based composite films were further studied. It was found that the composite film retained the chiral nematic structure and optical activity. The self-assembled CNC and BSA-AuNC helical superstructures can produce strong, left-handed, circularly polarized luminescence with dissymmetry factors up to 0.287. Meanwhile, the third component, polyethylene glycol, was introduced without affecting the structural color and fluorescence characteristics of the composite film to enhance the flexibility of the film. The simplicity of the film preparation, the abundance of CNCs, and the flexibility and stability of the composite films pave the way for the production of functional materials with integrated functions.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 2
·2308973
·
IF 19
Xiaoxiang Wen,Jinxia Zhang,Jianing Li,Yue Li,Yuchen Shi,Xuegang Lu,Sen Yang,Jing Yu
The escalating need for enhanced cryptographic security necessitates the development of advanced materials designed for the secure storage and transmission of information. Drawing inspiration from the unique color-altering and polarizing capabilities of beetles, this work develops a transparent, thermochromic, and circularly polarized cholesteric phase cellulose composite (CPCC). This is achieved by integrating self-assembled hydroxypropyl cellulose with cholesteric liquid crystal (CLC) structure in tandem with a crosslinked poly(N-isopropyl acrylamide) (PNIPAM) network. The crosslinking density impacts the response degree of thermochromism, which can be regulated by modifying the UV exposure time during PNIPAM production. The CLC structure in CPCC uniquely results in reflected right circularly polarized light. When coupled with waveplates, this mechanism inverts the rotation direction of the reflected light, creating orthogonal structural colors of different brightness levels under left and right circularly polarized light. The excellent transparency of CPCC facilitates seamless integration with the environment, offering optimal camouflage. Sophisticated techniques, such as color coding and Morse coding, can further be incorporated within the CPCC to increase encryption security and the complexity of decryption. Collectively, the CPCC's transparency, thermochromism, and chirality present significant potential in the design and development of materials for high-security information encryption, contributing valuable insights to the field.
研究领域:
材料科学
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光学与光子学
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信息安全
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软物质物理
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高分子化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Guojun Zhou,Sidan Wang,Nan Zhang,Yilin Mao,Jun Zhou,Zhiguo Xia,Xian-Ming Zhang
Despite increasing research interests in chiral hybrid metal halides for photonic applications, the chiral-identified multicolor-tunable photoluminescence (PL) remains a fundamental challenge for multilevel anti-counterfeiting. Herein, 0D antimony(III) enantiomers, ( R / S -C 5 H 14 N 2 ) 2 SbCl 5 ·2Cl, are designed and synthesized via chiral induction using R / S -3-aminopiperidine dihydrochloride as structural templates. Hydrogen bonding networks between C 5 H 14 N 2 + and [SbCl 5 ] 2− contribute to the chiral helical structures with distinct asymmetry factors, facilitating efficient chiral transfer across organic–inorganic interfaces. Incredibly, R - and S -enantiomers exhibit an unprecedented excitation-dependent PL behavior with chiral differentiation, leading to multicolor-tunable emissions across the visible-light spectrum, from blue to white to yellow. This originates from the competitive transitions between the triplet-state ( 3 P n →S 0 ) self-trapped excitons (STEs) of [SbCl 5 ] 2− and the singlet-state (S 1 →S 0 ) fluorescence of R / S -C 5 H 14 N 2 + . Beyond that, chiral organic ligands break the inorganic symmetry, facilitating spin–orbit coupling and excited-state splitting of R - and S -enantiomers, which governs the electron absorption transitions to achieve the chiral-identified multicolor-tunable PL. These materials are further employed in multilevel anti-counterfeiting by fabricating these precise images into periodic pixel arrays. This work establishes a paradigm for designing eco-friendly chiral emitters with superior PL tunability, as well as provides fundamental insight into multi-channel radiative transition mechanisms.
研究领域:
材料科学
·
光物理
·
手性光电子学
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防伪技术
·
无机化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Rui Cao,Xinning Zhou,Haitao Dai,Yong Wang,Yin Xiao
CPL-active flexible materials with high luminescence dissymmetry factor ( g lum ) and luminescent quantum yield are indispensable for 3D displays, wearable devices and so on. Perovskite has drawn much attention due to its fascinating photoelectric properties as well as its abundant applications. However, the existing strategies are inefficient in acquiring perovskite NCs with high g lum . In this work, thermoregulated CPL-active flexible polymer/perovskite hybrid materials with high g lum by the creation of chiral photonic bandgap in polymer film with cholesteric domains using toluene as the dielectric media is reported. Based on selective CPL reflection, a satisfied CPL with a maximum g lum of 0.6 is achieved. Importantly, the chiral photonic bandgap center of the polymer film can be easily tuned by thermal annealing at different temperatures to adapt various perovskite NCs with full-spectral emission. The handedness of CPL of hybrid materials can be regulated with and without dielectric media. The presence of the flexible polymer makes hybrid materials a candidate to achieve patterned display applications. Additionally, the polymer/perovskite hybrid materials show excellent stability thanks to the encapsulation effect from polymers. This work provides a facile and general approach to induce adjustable CPL in the whole visible spectrum with high g lum and photoluminescence quantum yield (PLQY).
研究领域:
材料科学
·
光电技术
·
光子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ruilian Chen,Rui Feng,Zhenjie Huang,Dengchong Feng,YuBo Long,Jiawen Zhang,Yuzhao Yang,Zetong Ma,Zhongke Yuan,Shaolin Lu,Zujin Zhao,Xudong Chen
Circularly polarized luminescence is essential to chiral and photonic science, but achieving circularly polarized thermally activated delayed fluorescence (CP-TADF) and circularly polarized room-temperature phosphorescence (CP-RTP) simultaneously remains a great challenge. This is because it is difficult to satisfy simultaneously the stable triplet exciton, appropriate energy gap, and the regular chiral environment. Herein, a simple strategy is reported to construct a persistent photoluminescent system, which can achieve TADF and RTP simultaneously by suppressing the non-radiative transition decay of the triplet exciton through intermolecular hydrogen bonding between acridine flavin (AF) and rigid polymer network. The persistent photoluminescent composite exhibited ultra-long lifetimes and high quantum yields. Then, a rarely multi-circularly polarized photoluminescence system containing CP-TADF and CP-RTP is constructed by the co-assembly of cellulose nanocrystals, polyvinyl alcohol, and AF. By utilizing the cholesteric structure, photonic band gap of chiral photonic crystals, and the stabilization mechanism of triplet exciton by intermolecular hydrogen bonding between the light emitter and rigid polymer, chiral photoluminescent films exhibited rare optical properties simultaneously: multi-circularly polarized photoluminescence emission, high and tunable dissymmetric factor, significant quantum yield, and ultralong lifetimes, which are not reported before and broaden the perspective for multi-circularly polarized luminescence.
研究领域:
材料科学
·
光学
·
光子学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）