Polymers
·
2022
·Vol. 14
·期 7
·1413
·
IF 4.967
Yang Yang,Ziyuan Zheng,Jun Lin,Lintao Zhou,Guohua Chen
Polarizer is a key component of the liquid crystal display panel, and the optical properties mainly include transmittance, degree of polarization and chromaticity. Polarizer is made of a multilayer optical film, in which the PVA polarizing film is the core structure for realizing the polarization of the whole polarizer. PVA polarizing film is commonly manufactured through a multi-step craft, including rinsing, dyeing, stretching and correcting. The correction process has a significant impact on the final apparent color and optical properties of the polarizer. In this study, the KI concentration in the correcting tank, ranging from 1% to 3%, was systematically investigated. With the increase in KI concentration, the Raman vibration peak at 160 cm−1representingI5−ions gradually weakened, while the Raman vibration peak at 110 cm−1representingI3−ions gradually increased, indicating that the KI in the correcting tank changed the chemical equilibrium of polyiodide ions in PVA. Then abundant chromophoreI5−ions were consumed andI3−ions generated, so that the apparent color of PVA polarizing film gradually changed from dark blue to dark gray, and the chromaticitya-value andb-value gradually increased. The change in the concentration of dichroic species (I5−andI3−) in PVA polarizing film had directly affected its transmittance in the visible range. From the UV-Vis transmittance spectrum of PVA polarizing film, when theI5−ions were consumed andI3−ions generated, the transmittance of PVA polarizing film in the region of 675–525 nm wavelength increased gradually while the polarization degree also increased.Keywords:PVA polarizing film;correction process;transmittance;chromaticity;degree of polarization
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 29
·2400493
·
IF 27.4
Quanlin Chen,Zijin Ding,Li Zhang,Di Wang,Cong Geng,Yanxing Feng,Jia Zhang,Miao Ren,Saisai Li,Saif M. H. Qaid,Yuanzhi Jiang,Mingjian Yuan
Full-Stokes polarization detection, with high integration and portability, offers an efficient path toward next-gen multi-information optoelectronic systems. Nevertheless, current techniques relying on optical filters create rigid and bulky configurations, limiting practicality. Here, a flexible, filter-less full-Stokes polarimeter featuring a uniaxial-oriented chiral perovskite film is first reported. It is found that, the strategic manipulation of the surfactant-mediated Marangoni effect during blade coating, is crucial for guiding an equilibrious mass transport to achieve oriented crystallization. Through this approach, the obtained uniaxial-oriented chiral perovskite films inherently possess anisotropy and chirality, and thereby with desired sensitivity to both linearly polarized light and circularly polarized light vectors. The uniaxial-oriented crystalline structure also improves photodetection, achieving a specific detectivity of 5.23 × 10 13 Jones, surpassing non-oriented devices by 10×. The as-fabricated flexible polarimeters enable accurate capture of full-Stokes polarization without optical filters, exhibiting slight detection errors for the Stokes parameters: Δ S 1 = 9.2%, Δ S 2 = 8.6%, and Δ S 3 = 6.5%, approaching the detection accuracy of optics-filter polarimeters. This proof of concept also demonstrates applications in matrix polarization imaging.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Hongfang Yang,Shuo Ma,Biao Zhao,Jianping Deng
Preparation of chiral materials from achiral helical polymers has aroused great interest among researchers. In this work, chiral small molecules were utilized to accomplish chiral induction toward racemic helical polyacetylene via intermolecular π–π stacking by which chiral films with strong optical activity were fabricated. Furthermore, introducing fluorescent components generated full-color and white circularly polarized luminescence (CPL). A CPL generation mechanism is proposed accordingly, namely circularly polarized light excitation (CP-Ex). CPL emission and amplification of the luminescence dissymmetry factor were achieved under the synergetic effect of CP-Ex and chirality transfer. The CP-Ex mechanism was further verified by the double-layered film consisting of a chiral layer and a fluorescent layer. More noticeably, for double-layered films, the sense of CPL signals can be switched by changing the direction of excitation light. This work opens up new strategies for exploring tunable multiple- and white-color CPL materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ziheng Wang,Xueying Chu,Jinhua Li,Zhankun Weng,Mingze Xu,Yingjiao Zhai,Li Ma,Xiaojun Wang
The polarization-sensitive optical properties of semiconductor nanorods (NRs) are attractive characteristics for optical devices . Although oriented NR films can provide convenient integration and new application opportunities, the realization of large-area NR films with polarized photoluminescence (PL) remains a challenge. Herein, we fabricated ordered CdSe/CdS NR films on an arbitrary substrate using the Langmuir-Blodgett technology. Polarization-sensitive PL was observed for the NR films. The band-edge exciton fine structure owing to the rod-like morphology and the dielectric effect of the orderly arranged NRs were discussed with a focus on the contribution to polarized photons. The degree of linear polarization of the CdSe/CdS NR films excited a circularly polarized light was approximately 0.30. When linearly polarized ultraviolet (UV) light was used as the excitation source, the PL intensity of the NR films periodically varied with the polarization direction of the UV light. The corresponding PL polarization (i.e., “excitation polarization”) was approximately 0.28. The polarization-sensitive fluorescence (approximately 526 nm) excited by the UV-polarized light (325 nm) demonstrates the potential for realizing low-cost polarization-sensitive devices using only a visible light charge-coupled device system.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenyan Ma,Di Lu,Junxue Liu,Siyu Lu,Qinhe Pan,Jiyang Li
Chiral carbon dots (CCDs) combined with outstanding photoluminescence and unique chirality have become intriguing carbon-based nanomaterials, however, the realization of the optical activity in both ground and excited states remains a great challenge. To overcome this difficulty, multicolor CCDs have been synthesized by changing surface oxidation states and P atom doping via solvothermal route, which emit unusual near-ultraviolet, and blue, yellow and red fluorescence with high photoluminescence quantum yields (PLQY) of 28.99%, 22.55%, 84.63%, and 75.73%, respectively. Benefiting from the excellent luminescence of CCDs and chiral environment of cellulose nanocrystals (CNCs), a series of CCDs@CNCs composite films were produced by matrix-assisted method. The electrostatic, H-bonds and vdWs interactions are found to drive the formation of co-assembly and facilitate the chiral transfer and amplify between CNCs and chromophores. Thus, the CCDs@CNCs films display bright and multicolor right-handed circularly polarized luminescence (CPL) with extremely high luminescence dissymmetry factor ( g lum ) values of −0.24 to −0.90. The synergy of intense g lum and high efficiency of multicolor composite films endow them with a potential for visual polarization detection. This research provides inspiration and feasibility for constructing CPL-active materials in co-assembly system and harvesting high g lum value.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2019
·
IF 13.903
Jiaqi Ma,Chen Fang,Chao Chen,Long Jin,Jiaqi Wang,Shuai Wang,Jiang Tang,Dehui Li
Chiral materials are of particular interest and have a wide range of potential applications in life science, material science, spintronic, and optoelectronic devices. Two-dimensional (2D) hybrid organic–inorganic lead halide perovskites have attracted increasing attention. Incorporating the chiral organic ligands into the layered lead iodide frameworks would introduce strong chirality in pure 2D perovskites for potential applications in circularly polarized light (CPL) emission and detection; nonetheless, studies on those aspects are still in their infancy. Here, we report on the strong CPL emission and sensitive CPL detection in the visible-wavelength range in pure chiral (R-/S-MBA)2PbI4 (MBA = C6H5C2H4NH3) 2D perovskites, which are successfully synthesized with a needle shape and millimeter size by incorporating the chiral molecules. The chiral 2D perovskites (R-MBA)2PbI4 and (S-MBA)2PbI4 exhibit an average degree of circularly polarized photoluminescence (PL) of 9.6% and 10.1% at 77 K, respectively, and a maximum degree of the circularly polarized PL of 17.6% is achieved in (S-MBA)2PbI4. The degree of circularly polarized PL dramatically decreases with increasing temperature, implying that the lattice distortion induced by the incorporated chiral molecules and/or temperature-dependent spin flipping might be the origin for the observed chirality. Finally, CPL detection has been achieved with decent performance in our chiral 2D perovskite microplate/MoS2 heterostructural devices. The high degree of the circularly polarized PL and excellent CPL detection together with the layered nature of pure chiral 2D perovskites enables them to be a class of very promising materials for developing and exploring spin associated electronic devices based on the chiral 2D perovskites.
研究领域:
材料科学
·
光电子学
·
自旋电子学
·
纳米技术
·
物理化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 36
·2407010
·
IF 27.4
Dongyan Li,Zexin Li,Yan Sun,Jian Zhou,Xiang Xu,Haoyun Wang,Yunxin Chen,Xingyu Song,Pengbin Liu,Zhengtang Luo,Su-Ting Han,Xing Zhou,Tianyou Zhai
Miniaturized polarimetric photodetectors based on anisotropic two-dimensional materials attract potential applications in ultra-compact polarimeters. However, these photodetectors are hindered by the small polarization ratio values and complicated artificial structures. Here, a novel polarization photodetector based on in-sublattice carrier transition in the CdSb 2 Se 3 Br 2 /WSe 2 heterostructure, with a giant and reconfigurable PR value, is demonstrated. The unique periodic sublattice structure of CdSb 2 Se 3 Br 2 features an in-sublattice carrier transition preferred along Sb 2 Se 3 chains. Leveraging on the in-sublattice carrier transition in the CdSb 2 Se 3 Br 2 /WSe 2 heterostructure, gate voltage has an anisotropic modulation effect on the band alignment of heterostructure along sublattice. Consequently, the heterostructure exhibits a polarization-tunable photo-induced threshold voltage shift, which provides reconfigurable PR values from positive (unipolar regime) to negative (bipolar regime), covering all possible numbers (1→+∞/−∞→−1). Using this anisotropic photovoltaic effect, gate-tunable polarimetric imaging is successfully implemented. This work provides a new platform for developing next-generation highly polarimetric optoelectronics.
研究领域:
凝聚态物理
·
纳米光电子学
·
材料科学
·
半导体器件
·
二维材料
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Rong Lu,Zhuangchuan Wen,Pengfei Zhang,Yang Chen,Huihui Wang,Huile Jin,Lijie Zhang,Yihuang Chen,Shun Wang,Shuang Pan
The ability to design halide perovskite nanocrystals (PNCs) with circularly polarized luminescence (CPL) offers exceptional potential in photonic technologies. Despite recent inspiring advances, the creation of PNCs with full-color tailorablity, outstanding CPL, and long-term stability remains a substantial challenge. Herein, a robust strategy to craft CPL-active PNCs is reported, exhibiting appealing full-color tunable wavelengths, enhanced CPL, and prolonged stability. In contrast to conventional methodologies, this strategy utilizes chiral nematic mesoporous silica (CNMS) as host to render in situ confined growth of diverse achiral PNCs. By strategically engineering photonic bandgap, adjusting loading amount of PNCs, and manipulating cations/anion compositions of PNCs, robust CPL responses with tunable wavelength and intensity are successfully obtained. The resulting PNCs-CNMS achieves stable CPL emissions with full-color tunability and impressive luminescent dissymmetric factors up to −0.17. Remarkably, silica-based hosts as a protective barrier confer exceptional resistance to humidity, photodegradation, and thermal stability, even up to 95 °C. Furthermore, the ability to achieve reversible CPL switching within PNCs-CNMS is attainable by leveraging the responsiveness of CNMS matrix or dynamic behavior of impregnated PNCs. Additionally, circularly polarized light-emitting diode devices based on PNCs-CNMS can be conveniently fabricated. This research affords a powerful platform for designing functional chiroptical materials.
研究领域:
材料科学
·
光子学
·
纳米技术
·
光电
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Jun Gou,Xiutao Yang,Hang Yu,He Yu,Yuchao Wei,Ziyi Fu,Laijiang Wei,Zexu Wang,Jiayue Han,Zhiming Wu,Yadong Jiang,Jun Wang
Conventional nm-scale Bi 2 O 2 Se-based near-infrared (NIR) photodetectors (PDs) exhibit commendable performance in terms of responsivity and response speed. Currently, the growing complexity of application scenarios requires NIR PDs to possess not only these fundamental functionalities but also the capability for NIR polarization detection and operation well under dim light conditions. Here, this study proposes the 2D ReS 2 /3D Bi 2 O 2 Se homo-heterojunction PD, which exhibits high photo-response speed, polarization-sensitive detection capabilities, and enhanced sensitivity in the NIR spectrum. In detail, a device constructed from µm-thick Bi 2 O 2 Se demonstrates polarization-sensitive photodetection at a wavelength of 850 nm, exhibiting a polarization ratio of 1.4 achieved by applied voltage modulation. Based on photogating effect and strong intrinsic absorption, the homo-heterojunction PD also can detect light power level of nW at 1310 nm, with a response speed of ≈10 µs and responsivity of 34.8 A W −1 at this wavelength. Additionally, this configuration exhibits an outstanding specific detectivity exceeding 10 10 Jones within the wavelength range of 700 to 1310 nm. Even at a cut-off wavelength of 1550 nm, the device achieves a specific detectivity of ≈10 9 Jones. The ReS 2 /Bi 2 O 2 Se heterojunction NIR PD shows promise for advanced optoelectronic applications due to its high sensitivity and polarization-sensitive photodetection in NIR band.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Lei Tong,Xiaoyan Duan,Luyao Song,Tiande Liu,Lei Ye,Xinyu Huang,Peng Wang,Yuanhui Sun,Xin He,Lijun Zhang,Ke Xu,Weida Hu,Jian-Bin Xu,Jianfeng Zang,Gary J. Cheng
Intrinsic linear polarized optics discovered in anisotropic two-dimensional (2D) materials has attracted intense interest for polarization-sensitive optical and optoelectronic applications , such as black phosphorous, ReSe 2 , etc. However, the lack of matured method to synthesize high-quality, large-scale and air-stable 2D materials with anisotropic properties, is still an obstacle for practical applications. Monolayer molybdenum disulfide (MoS 2 ), which exhibits strong direct-band-gap light-harvesting properties, can be grown maturely. But unfortunately, MoS 2 does not show linear dichroism owing to its in-plane isotropic crystalline symmetry. We, herein, for the first time, report on an artificial control of extrinsic linear polarized photoelectric effect in monolayer MoS 2 , by successfully controlling its anisotropic degree of in-plane crystal symmetry via artificially induced uniaxial tensile strain . Strong linear polarization-sensitive photodetection from visible to near-infrared range is realized for monolayer MoS 2 -based device, and the polarization anisotropic ratio can reach up over 2.0 under 4.5% strain. The observation is supported by combination of experiment-theory study on polarized Raman spectrum and optical absorption under gradually applied strains. Our results have demonstrated that the artificial-controlled symmetry reducing of MoS 2 is a promising strategy to achieve high performance polarization photodetection. This method can also be extended to other 2D materials, which potentially opens up a new field to endow isotropic 2D materials with anisotropic functionalities by artificial structure engineering.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Feng Zeyu,Li Jialei,Yang Peng,Xu Xiangxiang,Wang Di,Li Jiahe,Zhang Chutian,Li Jingguo,Zhang Hongli,Zou Gang,Chen Xin
Multimodal optical-materials are highly desirable due to their advantages in enhancing information security, though independent modulation is challenging, especially accurately controlling the orthogonal relationship between the structural coloration (SC) and fluorescence (FL) pattern. Herein, we report a strategy which combines programmable structural coloration and switchable circularly polarized luminescence (CPL) for multimodal information encryption. Using photomask with aligned grating, programmable periodic patterns are fabricated on a polydiacetylene (PDA) gel film, which produces image in tunable structural colors. Introducing a chiral fluorescence layer containing perovskite nanocrystals and twisted-stacking Ag nanowires (NWs) bilayers, which provides stimuli-responsive FL and CPL with high dissymmetry factor ( g lum , up to 1.3). Importantly, the structural coloration information and FL patterns (including CPL pattern) can be independently modulated without mutual interference, even selectively concealed or exposed by varying microstructure design of the cross-linked PDA gel or by acetonitrile treatment.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optical Materials Express
·
2020
·Vol. 11
·期 1
·171-179
·
IF 3.064
Shi-Tong Xu,Shi-Tong Xu,Fei Fan,Shu Chen,Yanzhao Xing,Yuebo Gao,Huixin Li,Guangcheng Niu,Sheng-Jiang Chang,Sheng-Jiang Chang,Sheng-Jiang Chang
In this work, a new strategy was proposed for active control of mm-thick liquid crystals (LC) cell to realize the polarization manipulation in terahertz (THz) regime, which through the electric field control and static magnetic field pre-anchoring. The LC cell was fabricated by a nematic 5CB LC and two silica substrates that were coated with the graphite layer as the transparent electrode. Under the pre-anchoring of the static magnetic field, the optical axis of LC can be precisely controlled by the variable electric field. By using a THz-TDS with a wire grid polarizer, the output THz polarization from the LC cell can be deduced from the amplitude and phase shift of ±45° components. Here, we systematically analyzed three different outfield configurations. Only if the ±45° components that output from the polarizer have phase shifts, can the polarization state conversion be realized. The results show that the linear to circular or the cross-polarization conversion were realized under the specific electric field. This work provides a new approach for the thick-LC layer anchoring and orientation control, and also the tunable polarization manipulation of THz LC devices.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）