CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Shuqing Wang,Wenshuo Liu,Dongliang Yang,Yinfu Lu,Xiujuan Li,Dong Wang,Yi Luan
Dichroic dye doping and electrical driving enable Vis/UV color modulation. • Single-layer 75 μm color PDLC pixel arrays are realized by photolithography. • Multicolor patterned display is achieved by voltage-controlled pixel switching. • Region-addressed pixels enable multilevel optical information encryption. Polymer dispersed liquid crystals (PDLCs) show reversible voltage-controlled switching between light-scattering and transparent states, but their intrinsic colorless nature limits their applications in multicolor display and multilevel information encryption. To overcome these limitations, this work demonstrates a single-layer pixelated dual-mode PDLC device by combining photolithographically defined microchannels with dichroic dye-doped PDLCs (DPDLCs). In this design, the CMY system is used for visible-light subtractive color modulation, while the UV-excited fluorescence provides an additional hidden readout channel for information encryption. The anisotropic absorption and fluorescence emission of dichroic dyes, together with the electrically tunable response of PDLCs, enable voltage-controlled visible color modulation and UV-excited fluorescence modulation. Through photolithographic fabrication and selective filling, cyan, magenta, and yellow DPDLC units were spatially integrated into single-layer CMY pixel panels. The fabricated devices exhibited well defined subpixel arrays with an individual stripe width of approximately 75 μm, moving PDLC color devices from macroscopic patterned films toward microscale pixelated structures. The distinct voltage responses of different DPDLC formulations further enable stepwise electrical color modulation of the CMY pixel devices, resulting in electrically tunable multicolor states with stable cycling performance. By combining the pixelated DPDLC devices with patterned electrodes, voltage-controlled multicolor patterned display and dual-mode information encryption are further demonstrated. This strategy provides a feasible route for constructing microscale pixelated DPDLC color devices with electrically tunable visible/fluorescent responses for patterned display and information encryption applications. Download: Download high-res image (142KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.9
Yinfu Lu,Yinghao Li,Yang Zhao,Zixuan Zhou,Xiangtian Bai,Hao Luo,Zhou Yang,Dong Wang,Yuzhen Zhao
Optimized formulations produce RGB structural colors and dual visible‑UV encryption signals from fluorescent PDLC. • Wavelength-selective Bragg reflection enables multi-stage decryption for high-security anti-counterfeiting. • A ternary PSCLC/PDLC/PCL composite is prepared via two‑step polymerization to achieve tunable cholesteric helical pitch. Liquid crystals (LC) are regarded as promising candidates for optical encryption on account of their distinctive stimulus-responsive structural coloration. However, single-component polymer-stabilized cholesteric liquid crystal (PSCLC) systems suffer from limited information encoding dimensions. Polymer-dispersed liquid crystals (PDLC) can only achieve basic light scattering modulation and cannot meet the requirements of complex multi-channel encryption. To circumvent these drawbacks, a synergistic PSCLC/PDLC/polycaprolactone (PCL) composite thin film is fabricated for optical anti-counterfeiting. Laser-patterned PDLC templates are filled with PSCLC precursors, and S5011-loaded PCL thin films laminated on independent glass substrates serve as sustainable chiral donors. Regulated interlayer chiral diffusion enables continuous tuning of structural hues within predefined laser-etched cavities. Incorporation of red fluorescent powder imparts dual visible and ultraviolet imaging capacity to the composite. Tunable color variation in designated regions is realized via precise modulation of diffusion temperature and duration. Benefiting from the wavelength-selective Bragg reflection effect of cholesteric liquid crystals (CLCs), multi-layered information encryption is accomplished. Colored patterned regions can only be visualized under matching monochromatic illumination. Benefiting from facile manufacturing, large information storage capacity and diversified encryption modes, the proposed composite presents great application potential in premium anti-counterfeiting tags, encrypted two-dimensional codes and intelligent display devices. Download: Download high-res image (211KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
B.L. Zhu,X.J. Cai,C.C. Wang,J. Wu,J.L. Yao,W.Q. Sun
Sb-doped SnO 2 (ATO) films were prepared with different RF powers ( P RF ) under two O 2 flow rates ( F O 2 ) by magnetron sputtering , and then subjected to rapid thermal annealing (RTA) treatment. The effects of P RF , F O 2 , and RTA on the crystallinity, stress, surface morphology , conductive properties, transmittance in visible-light range ( T Vis ), and energy gap ( E g ) of the films were investigated. As the P RF increases, the film crystallinity improves or first improves and then slightly degrades, and the compressive stress decreases. With increasing P RF , the surface changes from textured to granular morphology and from granular to honeycomb-like morphology under two F O 2 , respectively. Meanwhile, the conductive properties first enhance and then degrade, and the T Vis and E g tend to decrease, especially at higher P RF . Basically, the films prepared with higher F O 2 have lower compressive stress, inferior conductive properties, and larger T Vis and E g compared with the films prepared with lower F O 2 . After RTA, the film crystallinity obviously improves, the compressive stress transforms into tensile stress , and the surface morphology has not undergone significant changes. Meanwhile, the conductive properties significantly enhance and E g obviously increases. The T Vis of the films prepared with lower F O 2 can be increased by RTA. The influence mechanisms of the above factors on the structure and optoelectronic properties of the ATO films were explored, and ultimately, the ATO films have the T Vis of 76.35–80.86%, sheet resistance of 51.7–91.9 Ω/sq., and quality factor of 1.03–1.67 × 10 −3 Ω −1 within the optimized P RF range. Polymer-dispersed liquid crystal (PDLC) films were fabricated using optimized performance ATO films as electrodes, and their on-state transmittance, off-state transmittance, threshold electric field, and saturation electric field were 2.08–4.61%, 61.69–68.56%, 0.656–0.796 V/μm, and 1.68–2.108 V/μm, respectively. The current results indicate the potential application of ATO films in PDLC films as electrode.
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
OPTICAL MATERIALS
·
2022
·
IF 3.754
Zemin He,Ping Yu,Jianjing Gao,Cheng Ma,Xueyan Feng,Huimin Zhang,Yuzhen Zhao,Zongcheng Miao
In this study, an effective method was demonstrated to improve the performance of polymer dispersed liquid crystal (PDLC) films by incorporating nano-sized polyhedral oligomeric silsesquioxane (POSS) particles into the polymer matrix . The thiol-functionalized POSS dispersed uniformly in the polymer phase by participating in the crosslinking reaction of epoxy and thiol monomers. Consequently, low driving voltages within the safety range were achieved by introducing POSS in percentage of 6 wt%, due to the combined effects of regulating the polymer morphology and lowering the surface energy. Moreover, the contrast ratio was improved to be higher than 300. Stability and switchability were also verified in on-off cycles, indicating its lifetime of as least 50000 cycles. In addition, the epoxy and thiol material system contributed to the outstanding mechanical strength , which could help maintain the electro-optical properties even in flexible films. This work could provide an effective approach for the optimization of PDLC films and promote their potential applications in fields such as flexible displays and smart windows.
研究领域:
材料科学
·
聚合物科学
·
光电子学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.9
Hongbo Lu,Shunpin Mo,Lei Chen,Xiaoyu Chang,Fang Yong,Miao Xu
Polymer-dispersed liquid crystals (PDLCs) with low volume shrinkage and high peel strength were prepared through an epoxy-thiol click reaction catalyzed by the photogenerated base catalyst. The epoxy-thiol reaction was initiated by UV light irradiation, effectively circumventing the environmental sensitivities typically associated with conventional thermally-catalyzed polymerization processes. A systematic study was conducted to examine the impact of polymer concentration, curing temperature, polymerization light intensity and the structure of epoxy on PDLC performance. The results showed that adding a rigid epoxy structure can significantly improve the peel strength, broaden the viewing angle, and smaller the volume shrinkage. Moreover, the incorporation of 25 wt% 2,2-Bis(4-glycidyloxy-phenyl)propane into the PDLC formulation yielded PDLC with an exceptional peel strength of 50.60 N/m, volume shrinkage of 5.06%, and an expansive viewing angle having transmittance above 80% from 0° to 60°, making them highly suitable for flexible PDLC applications.
研究领域:
材料科学
·
高分子化学
·
液晶
·
光学材料
·
粘附技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）