ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Xiaoxu Ran,Jie Ren,Shufen Zhang,Yue Wu,Suli Wu
Electrochromic photonic crystals (PCs) have been intensively studied in the field of display, sensors, and intelligent materials due to their tunable brilliant structural colors. The mostly studied electrochromic PCs are based on the tunable lattice parameter after electrifying; namely, the electrochromic process is caused by the structural change of PCs. Besides the lattice parameter, the refractive index is another key factor to determine the structural color of PCs. Here, a kind of hollow-SiO2-supported WO3 (H-SiO2/WO3) PCs is designed, where the refractive index of the WO3 portion is changeable under charging. Benefiting from the support effect and tunable thickness of H-SiO2, large-area PC samples with good surface morphology and bright multicolor output are prepared. The reflection peaks of these composite PCs can shift by 30–90 nm, and their corresponding colors changed obviously after the voltage was applied. After being pixelated by laser-marking, the H-SiO2/WO3 PCs can dynamically display different numeric and alphabetic patterns in an electric-driven writing and erasing process. Not only does this composite PC structure broaden the color change range of WO3-based materials but also avoids the structural change in the electrochromic process. This work provides more possibilities for electrochromic PCs in the field of color-changing pattern displays.
研究领域:
材料科学
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显示技术
·
智能材料
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DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Rui Wang,Maohui Yuan,Chaofan Zhang,Hongyan Wang,Xiaojun Xu
Transition metal ions (e.g. Mn 2+ ) and lanthanide co-doped upconversion (UC) materials have attracted wide attention in recent years due to their promising application in multicolor display. Here, we report the hydrothermal synthesis and characterization of Mn 2+ doped monodisperse CaF 2 :Yb 3+ /Ho 3+ microspheres . The results of X-ray diffraction (XRD) revealed that Mn 2+ doping does not change the cubic phase of CaF 2 material but will lead to diffraction peaks shifting slightly towards higher angle due to the substitution of larger Ca 2+ by the relatively smaller Mn 2+ . Under the excitation of 980 nm continuous wave (CW) laser, these microspheres exhibit green-yellow-red tuning colors and remarkable enhancement of both red to green ratio (R/G) and red to blue ratio (R/B) when increasing Mn 2+ concentration from 0 to 30 mol%. The energy migration process between Ho 3+ and Mn 2+ was proposed and supported by time-decay and power dependence measurements of Ho 3+ UC emission. These upconversion materials may have potential applications in optical devices , color display, nanoscale lasers and biomedical imaging.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Wan-Xiong Yong,Wei-Ning Liu,Xiao-Ying Xin,Guo-Dong Fu
In recent years, smart windows that provide energy-efficient solutions for the construction and transportation sectors have attracted considerable interest as a result of increasingly severe environmental issues. Electrochromic windows have emerged as a prominent option because of their high coloring efficiency and broad optical modulation range. However, traditional electrochromic devices necessitate the use of an external electric field to operate, which not only increases energy consumption but also poses safety risks. In this study, we propose a novel self-powered electrochromic smart window that utilizes the principles of self-charging batteries to achieve optical modulation across a wide spectrum of visible light. This device utilizes viologen derivatives as electrochromic materials due to their highly reversible redox reactions and the ease with which their colors can be manipulated. The devices can exhibit three distinct display states, transitioning from colorless or pale yellow to blue, purple, and green, by varying the types of viologen derivative electrochromic materials employed. Notably, simply disconnecting the zinc anode from the conductive glass cathode enables the self-recovery of the electrochromic state, thereby restoring the initial transmittance level. This recovery takes place as the viologen cation radical spontaneously oxidizes to form the divalent ion; a process facilitated by oxygen dissolved within the gel electrolyte. The device not only features a multicolor display and efficient optical modulation but also demonstrates excellent cycle stability and safety. Consequently, the smart window presented functions as a multifunctional device, serving both as an electrochromic window and an energy storage unit. This innovative self-powered multicolor display device significantly broadens the application scope of electrochromic smart windows. It achieves not only the shading effect of optical modulation but also meets the energy-saving and flexible design needs in the fields of architecture and transportation, thereby providing opportunities for further applications in the new energy industry.
研究领域:
材料科学
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能源技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yang Hu,Dongpeng Yang,Dekun Ma,Shaoming Huang
Mechanochromic photonic crystals (MPCs) that can change their colors under pressures are highly desired. However, the poor sensitivity of MPCs (including the limited tuning range of photonic bandgap and responsive speed) and stability restrict their practical applications. Here, extremely sensitive MPCs film with outstanding optical performances was fabricated through the self-assembly of the silica particles into di(ethylene glycol) ethyl ether acrylate (DEGEEA) and fixing the ordered structures by photopolymerization. The strong electrostatic repulsion between the particles was experimentally proved to be the key for the self-assembly of silica particles in nonpolar DEGEEA, ruling out the solvation force as the driving force. Compared with the conventional MPCs, the as-fabricated MPCs exhibit significant improvements in optical performances, including broad tuning range of photonic bandgap (362 nm), high sensitivity (7.55 nm/kPa), fast responsive speed (7.0 nm/ms), long-lasting usability (>2 months), wide working temperature range (−20 to100 ℃) and excellent reversibility (>1000 times) in cycling test. Based on these characteristics, the MPCs can be used for display applications with high-resolution (up to 5.0-µm resolution) and full colors. This work provides new insight for the self-assembly of colloids and will extend the applications of MPCs in sensitive sensors, multicolor displays, and smart windows.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 40
·19118-19123
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IF 3.925
Danyang Liu
A fluorescent molecular switch (SP-OX-HBT), designed by fusing spiropyran with 2-(2-hydroxyphenyl)benzothiazole (HBT), exhibited red, orange and dark emission color switching among four states in the solution and solid states. The transformation from merocyanine (SP-OX-HBT) to ring-closed spiropyran (SP-HBT-C) or deprotonated ring-closed spiropyran (SP-HBT-CN) could be controlled by visible light or base stimuli, respectively, and these processes are verified by UV-vis spectra. The deprotonated merocyanine form (MC-N) was briefly involved in the basochromic process in solution but stable in the solid state. Besides the significant visible and fluorescent color variations, the single molecular switch has been further successfully applied to construct reversible multicolor displays and for anti-counterfeiting.
研究领域:
化学
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材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 24
·2301065
·
IF 9
Shanshan Song,Tingting Hao,Bo Wang,Dongqi Liu,Zichen Ren,Yike zhang,Wenchao Liu,Leipeng Zhang,Yao Li
Polyaniline (PANI) can achieve reversible optical modulation in visible and infrared (IR) bands under the action of voltage. However, PANI-based electrochromic devices cannot cope with the dual detection of visible and IR light to realize the transmission of information due to the linkage restriction between the spectral modulation in the visible and IR region. Here, IR low-absorptive inorganic pigments as colorants and IR high-transparent polymer as a binder are utilized to prepare colored films with high transparency. A camouflage layer against visible light detection is constructed on the surface of IR electrochromic devices, and the information transmission is realized in the IR band by controlling the thermal radiation characteristics. Furthermore, thermochromic microcapsules (TMs) that change color under external thermal stimuli are introduced to fabricate a thermochromic and IR transparent functional layer, which is attached to the surface of IR electrochromic devices and endows the devices with separate spectral modulation ability in the visible and IR region. Multicolored displays are fabricated by arraying various devices. Moreover, visual patterns are prepared on the surface of IR electrochromic devices by dispensing technology. This configuration endows the device with a promising potential for anti-counterfeiting, optical security, and related applications.
研究领域:
材料科学
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光学工程
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信息传输技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2024
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IF 4.1
Huiyao Zhang,Yun Wang,Runzi Lu,Hongju Zeng,Ting Liang,Xingbin Lv,Changjing Cheng,Hairong Yu
Photonic soft materials, especially responsive photonic hydrogels (RPHs) with periodic permittivity on the submicroscale, have been garnering interest as colorimetric indicators and mechanochromic sensors. However, the fabrication of RPHs with both bright discoloration, satisfactory mechanical properties, and excellent mechanochromic sensitivity to meet the practical applications is still a great challenge. Herein, we develop a novel photonic crystal material using a Fe 3 O 4 array embedded poly( N -isopropylacrylamide- co -acrylamide)/ laponite-XLS (PNA-XLS) hydrogel, which is dual-cross-linked by chemical and physical cross-linkers. Due to the interaction of sparse chemical links and apposite physical links between the polymeric networks, the PNA-XLS exhibits a significant energy dissipation and high deformation capacity, with an enhanced tensile strength above 819 kPa and elongation above 1015 %. It almost has a full-color tunable range and shows bright discoloration that can be reversibly actuated by bending, stretching, and small pressures (Pa level), with extremely high sensitivities of pressure (161 nm kPa −1 ) and tension (1.52 nm % −1 ). Moreover, its self-adhesion (133 kPa) would make it be an appealing candidate to develop portable sensors or wearable devices without auxiliary adhesive tools. Besides, elastic hydrogels with programmable and multicolor patterns can be designed by the mask-assisted UV photopolymerization of regional pregel solution. Therefore, such hydrogel has a great application potential in colorimetric indicators, mechanochromic sensors, anti-counterfeiting and wearable devices.
研究领域:
材料科学
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生物医学工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 11
·1800026
·
IF 4.834
Liwei Dai,Xuefei Lu,Liping Song,Youju Huang,Baoqing Liu,Lei Zhang,Jiawei Zhang,Si Wu,Tao Chen
Due to their abundant optical colors, durable color generation, and high refreshing rate, smart chromic nanomaterials (SCNMs) have been employed in various applications. However, most SCNMs often require multicomponent materials, precise morphology control, and complicated modulation to realize multicolor changes, which limits their widely practical applications. In the present study, a simple and effective strategy is demonstrated to achieve the flexible and cost-effective multicolor gold nanorods (Au NRs)/polymer hybrid film, by tuning macroscopic-oriented Au NRs in films and a synergy of polarization-dependent surface plasmon resonance. Au NRs are first functionalized with methoxypoly(ethylene glycol)thiol to improve the compatibility, ensuring Au NRs can be homogenously dispersed in the polyvinyl alcohol (PVA) matrix with high particle density. The macroscopic-oriented alignment of Au NRs can be achieved by the elongation of the PVA polymer molecular chains. Under different polarized excitation directions, the same strip of the hybrid film exhibits various colors including red, orange, yellow, and green. Therefore, the strategy provides a simple and powerful approach to achieve macroscopic-oriented anisotropic nanoparticles in the polymer matrix, and the resultant hybrid films are promising in various practical applications, such as color displays, optical devices, and plasmonic biosensors.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Liangmiao Zhang,jian Wu,Changzheng Pan,Hao Zeng,Yantong Li,Yanfeng Gao
Dual-band electrochromic smart windows (DESWs) have attracted widely concern for their potential in significantly reducing building energy consumption by selectively controlling near-infrared (NIR) and visible light (VIS) transmittance. However, its monotonous color changes limit its large-scale application. In this study, we designed a DESW based on the layer-stacked polyaniline (PANI)/silver Nanowires (Ag NWs) composite films . When PANI films is stacked layer by layer with Ag NWs, it not only performs dual band regulation, but also exhibits impressive electrochromic performance with rich color conversions (light yellow, yellow-green and blue-black). The four-layer PANI/Ag NWs composite film outperformed the pure single-layer PANI film because of the faster electron transfer , its coloring time and bleaching time at 525 nm were shortened to 6.7 s and 18.0 s, respectively, and the coloring efficiency was increased to 45.5 cm 2 C -1 . After 2500 cycles, the PANI/Ag NWs films tend to have better cycle stability. Therefore, the incorporation of Ag NWs enhances the electrochromic performance of PANI films, providing valuable insights for advancing single-component organic electrochromic materials.
研究领域:
材料科学
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纳米科技
·
功能高分子
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光电材料
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建筑节能
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 15
·2107452
·
IF 15.153
Qinyi Li,Dongyang Shen,Chengzhao Luo,Zhishuai Zheng,Wenlin Xia,Wenchen Ma,Jie Li,Yixing Yang,Song Chen,Yu Chen
Although all-inorganic perovskite materials present multiple fascinating optical properties, their poor stability undermines their potential application in the field of multi-color display. Herein, spatially confined CsPbBr 3 nanocrystals are in situ crystallized within uniform mesoporous SiO 2 nanospheres (MSNs) to regulate their size distribution, passivate their surface defects, shield them from water/oxygen, and more importantly, enhance their thermotolerance. As a result, the remnant PL intensity of the prepared spatially confined perovskite (CsPbBr 3 ) nanocrystals by in situ crystallization within uniform mesoporous SiO 2 nanospheres (SCP@MSNs) powders can be maintained over 98% of its initial value even after being immersed in harsh conditions (0.1 m HCl or 0.1 m NaOH) for 60 days. Furthermore, the prepared SCP@MSNs-PDMS film demonstrates astonishing thermostability by maintaining almost consistent room temperature PL intensities after continuous heating–cooling cycles between 200 and 25 °C, which would greatly improve its processability during potential industrial manufacturing. The fabricated LCD backlit based on SCP@MSNs covers 124% of NTSC standard and 95.6% of Rec. 2020 standard, indicating its great potential in practical display field.
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
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Fangyuan Sun,He Zhang,Jiayi Cai,Fengyu Su,Yanqing Tian,Yan Jun Liu
π-Extended viologen derivatives of SHP , THP and FHP with selenophene , thiophene and furan units between two pyridine moieties, respectively, as chromophores , were synthesized. Compared with conventional viologen of DHP using bipyridines as the chromophore, the three compounds of SHP , THP , and FHP possess extended conjugation lengths and narrowed bandgaps. All-in-one electrochromic devices (ECDs) were assembled using these four viologen derivatives and investigated systematically. Due to the different electronic properties of the chromophores, the devices exhibited different colored states , blue, blue-violet, magenta and red. Furthermore, the electrochromic response of SHP , THP , and FHP extended into near-infrared (NIR) region due to the long conjugation as compared with that of DHP . Further, the ECDs possessing SHP , THP and FHP displayed faster response speed and relatively higher coloration efficiency than that of DHP . Among them, ECD based on FHP has shown the most excellent stability, which retains 95.7% optical contrast of its initial state after continuous working for 20000 cycles. Additionally, upon applying a switching potential, electrofluorochromic (EFC) properties of the devices based on THP and FHP were observed. This study revealed structure-property relations and demonstrated that manipulation of chromophores offers an effective route to obtain multicolor and multifunctional ECDs, which provides potential applications for colorful displays and smart windows .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2300615
·
IF 29.4
Shuxin Wei,Wei Lu,Huihui Shi,Shuangshuang Wu,Xiaoxia Le,Guangqiang Yin,Qingquan Liu,Tao Chen
Intelligent rewritable display systems have been long expected to reduce the heavy consumption of single-use or transient devices in the age of Internet-of-Things. However, it remains challenging to construct such systems with integrated functionality of remote control, rapid activation, multicolor and multimode display. Herein, by learning from the unique multilayer arrangement of chromatophores in chameleon skins, a promising kind of rewritable hydrogel multicolor systems is presented that can combine the merits of near-infrared (NIR) light-writing and projecting modes for on-demand information display. Specifically, the systems have typical multilayer layout consisting of poly(dimethylsiloxane) (PDMS)-sealed carbon nanotubes (CNTs) film as photothermal control unit and embedded fluorescent hydrogels as multicolor display unit, in which thermoresponsive hydrogel is constrained within non-responsive hydrogel. Such rational structure design results in the establishment of one promising display mechanism via the cascading “light trigger–heat generation–fluorescence output” process. On this basis, rapid and reversible hand-written display of arbitrary information is achieved within 5 s. Also, sustainable light-projecting display of predesigned multicolor patterns is demonstrated due to the multilayer design that ensures easy patterning of photothermal control or hydrogel display layer. This study brings functional-integrated merits for novel rewritable display systems and open new possibility to construct high-end products for information display/transmission.
研究领域:
材料科学
·
光电技术
·
显示技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）