查找使用阿拉丁产品的科研文献

Boosted Ambient Contrast Ratio of Light-Emitting Diode Display Devices With High Light Output Using a Laminated Interlaced Microgroove Janus Structure

Zongtao Li,Yunlong Zhang,Guanwei Liang,Fengyi Zhang,Jiasheng Li

Ultra-tough light-curing ionogels for UV shielding

Zhang Zeyu,Peng Dejun,Shang Xueyan,Zhao Xin,Ren Shixue,Pang Jiuyin,Li Shujun

The mechanical properties of polyurethane ionogels prepared by UV light-curing are usually inferior to those of conventional polyurethanes. Highly entangled polymer chain networks with chemical crosslinking can potentially address this problem. Here, we prepare ionogels (PU-HRs) using UV curing technology with esterified rutin as a cross-linking agent. After optimization of the preparation process by response surface methodology, we obtain PU-HRs with a tensile strength of 34.96 MPa and toughness as high as 88.11 MJ m −3 (1.26-fold higher than that of silk from the silkworm, Bombyx mori (70 MJ m −3 )). The high strength and toughness of PU-HR are mainly attributed to the three-dimensional cross-linked network structure formed by the “rigid-flexible” esterified rutin, the micro-phase separation structure between the soft-chain fragments, and the hard-chain fragments that form stable interfacial regions. These ionogels have great prospects in sunscreen coating applications, such as for sunscreen umbrellas and automotive or architectural sunscreen glass.

The effects of light irradiation on CsPbIBr2 films

Cuiping Xu,Xingming Yang,Xiaofan Sun,Wenchao Tang,Peiqi Ji,Junjie Jiang,Ziyi Xu,Hong-Ling Cai,X.S. Wu

In the present, we investigate the light-induced phase instability and the recovery in light-free for CsPbIBr 2 film. Both 585 nm and 695 nm photoluminescence (PL) peaks are detected by illuminating films. Results show that the appearance and the intensity of 585 nm and 695 nm PL peaks are affected by the wavelength, remaining time, and intensity of the illuminating light. Under short time illumination, the 695 nm PL peak may disappear after staying light-free, with light–dark reversible behavior. Under long time illumination, the 695 nm PL peak still exist in light-free and become irreversible behavior, which is caused by the formation of I-rich and Br-rich small grains, destroyed the homogeneous phase structure, and formed new steady states. X-ray diffraction analysis and the first principle calculations proved the mechanism of light-induced phase separation. We argue that CsPbIBr 2 -based solar cells are difficult to be applied before inhibiting the phase separation of CsPbIBr 2 .

Bioinspired Compound Eyes for Diffused Light-Harvesting Application

Xinxue Wu,Chaolong Fang,Wangdong Xu,Dawei Zhang

Natural compound eyes endow arthropods with wide-field high-performance light-harvesting capability that enables them to capture prey and avoid natural enemies in dim light. Inspired by natural compound eyes, a curved artificial-compound-eye (cACE) photodetector for diffused light harvesting is proposed and fabricated, and its light-harvesting capability is systematically investigated. The cACE photodetector is fabricated by introducing a cACE as a light-harvesting layer on the surface of a silicon-based photodetector, with the cACE being prepared via planar artificial-compound-eye (pACE) template deformation. The distinctive geometric morphology of the as-prepared cACE effectively reduces its surface reflection and the dependence of the projected area on the incident light direction, thereby significantly improving the light-harvesting ability and output photocurrent of the silicon-based photodetector. Furthermore, the performances of cACE, pACE, and bare polydimethylsiloxane (PDMS)-attached photodetectors as diffused light detectors are investigated under different luminances. The cACE-photodetector output photocurrent is 1.395 and 1.29 times those of the bare PDMS-attached and pACE photodetectors, respectively. Moreover, this photodetector has a desirable geometric shape. Thus, the proposed cACE photodetector will facilitate development of high-performance photodetectors for luminance sensing.

Digital light fabrication of reversible shape memory polymers

Yunpeng Shi,Guangqiang Fang,Zhengli Cao,Feizhou Shi,Qian Zhao,Zizheng Fang,Tao Xie

Reversible shape memory polymers (SMPs) have received extensive attention because of their unique deformation mechanisms and diverse shape-changing behaviors. However, the traditional methods of fabricating reversible SMPs usually result in the limitation of the accessible shapes and the corresponding shape-shifting behaviors. Herein, a reversible SMP with two crystalline phases is digital light-cured via thiol-acrylate chemistry with the assist of a digital light processing (DLP) technology. Thus, a set of special geometric patterns can be obtained by digitally defined exposure regions with a specified time, allowing the achievement of the 3D kirigami or origami reversible actuation. In addition, this strategy can be extended to the emerging advanced 3D or 4D printing technologies by introducing z-axis dimension or time gradient, facilitating the fabrication of sophisticated reprogrammable reversible shape memory devices, including 4D printed grabber and 3D printed movable cartoon character. Our approach based on DLP enables the rapid and precise manipulation of shape-changing materials, which can extend the possibilities for future development in aerospace and other potential applications.

Inchworm-Inspired Soft Robot With Light-Actuated Locomotion

Yuanyuan Yang,Dengfeng Li,Yajing Shen

Ultra-bright pure green perovskite light-emitting diodes

Zheng Haihua,Zhou Zhongpo,Wang Ti,Gui Pengbin,Wu Hao,Liu Chang

Inorganic perovskites, such as CsPbX 3 (X = Cl, Br, I), have attracted attention due to their excellent thermal stabilities and high photoluminescence quantum efficiencies. Here, we report on all-inorganic light-emitting diodes (LEDs), including inorganic perovskite emitters (CsPbBr 3 ) based on the heterostructure of n-ZnO/Al 2 O 3 /CsPbBr 3 /p-GaN. The effects of the CsPbBr 3 and Al 2 O 3 interlayers on the electroluminescence performance have been systematically investigated. It is observed that the Al 2 O 3 interlayer plays an important role in determining the emission performance. By introducing the Al 2 O 3 layers, the electron–hole recombination can almost be limited within the perovskite. The emission peaks of the heterojunction LEDs change from blue-green to pure green with the increased luminous intensities and decreased leakage currents. It provides an idea for the preparation of all-inorganic perovskite LEDs.

A self-healing and stretchable light-emitting device

Xiang Shi,Xufeng Zhou,Ye Zhang,Xiaojie Xu,Zhitao Zhang,Peng Liu,Yong Zuo,Huisheng Peng

A self-healing and stretchable electroluminescent device is developed from an electroluminescent phosphor sandwiched between two aligned carbon nanotube/polyurethane composite electrodes. The aligned carbon nanotubes may interconnect to recover the electrical conductivity while the polyurethane elastomer can recover the mechanical strength upon contact of the two broken parts. The wrinkled structure of the aligned carbon nanotube sheet and the use of the polyurethane elastomer further made the electroluminescent device stretchable. As a result, the self-healing and stretchable electroluminescent device maintained a stable luminance after cutting and healing for 10 cycles and after repeatedly stretching and releasing for 350 cycles.

Heterogeneous Architecture Light-Responsive Stiffness-Tunable Magnetic Actuator

Chao Wu,Jiawei Li,Qiankun Zhang,Hongjun Kang,Zhimin Xie,Zhongjun Cheng,Qiang Tao,Dongjie Zhang,Yuyan Liu

Actuators play important roles in various fields due to their high intelligence. However, the present actuators are hard to achieve high load capacity and easy and fast deformation simultaneously. Here, a novel heterostructure magnetic composite material is proposed, which can work as a matrix to create various actuators by easily tailored and magnetized. Initially, a UV-responsive stiffness-tunable polymer (URST-polymer) is developed using in situ encapsulation of reactive double bonds, achieving a modulus increase of up to 15 600 times after stiffening. By introducing NdFeB@PDA particles into URST-polymer, the heterostructure matrix is created through a one-step curing process, which features dual-functional layers: the layer with NdFeB@PDA particles ensures excellent magnetic actuation properties, while the pure polymer layer guarantees effective UV-induced stiffening. Consequently, the light-responsive stiffness-tunable magnetic actuator (LRST-MA) made by a heterostructure matrix demonstrates rapid actuation, bistable states, and high stiffness. The URST layer also imparts excellent shape memory properties due to a special polymer network. Combining those advantages with structural and magnetization design, the matrix can be used in applications such as multi-morphic actuators, variable stiffness grippers, deployable antennas, and emergency robots, which provide a simple and effective strategy for designing actuators.

Dynamic light-scattering metamaterial for smart window application

Haifeng Nan,Ling Wang,Hanrong Wu,Jun Lei,Zhong-Ming Li

In-situ composite electrodeposition integrating electrochromic materials with light-scattering structures. • Tungsten-oxide-based dynamic light-scattering metamaterial achieved by modulating deposition kinetics. • On-demand control of diffuse transmittance via voltage application. • Color variation matches visual thermal perception. Glass curtain walls and windows provide a typical solution for architectural daylighting design. However, normal glass materials fail to resolve the contradiction between daylighting and overheating, along with glare and privacy issues, especially in regions characterized by long sunshine hours, high irradiance intensity and arid climate. In this work, we introduce an in-situ composite electrodeposition strategy to regulate the micro-nanostructure of tungsten oxide, enabling the first preparation of tungsten-oxide-based light-scattering metamaterial with dynamically modulating diffuse transmittance through varying applied voltages. Its color variation aligns with visual thermal perception, demonstrating excellent visual-aesthetic properties. The maximum haze of metamaterial is 82.9%. The metamaterial exhibits a visible-light diffuse transmittance of 63.8% at 604 nm, and a total transmittance as high as 82.4% at 580 nm (in the bleached state). More importantly, the metamaterial exhibits excellent cycling stability, retaining 85.1% of its initial transmittance modulation at 633 nm after 4000 cycles. Thermal management test shows that the metamaterial can reduce indoor temperature by up to 11.8 °C versus normal glass. EnergyPlus simulations show that up to 49.4 MJ/m 2 of energy can be saved annually in Santiago with intense solar irradiance. The dynamic scattering metamaterial we have developed offers a sustainable and highly energy-efficient innovative solution for green building applications in regions abundant in solar resources.

A light/water/fire-stable, cooling wood composite

Chaoqun Ji,Kaisheng Zeng,Xinxin Li,Lihui Chen,Jianguo Li,Haodong Sun,Yiqiang Wu

Delignified wood is functionalized with CA binder and nano-SiO 2 for radiative cooling. • The composite demonstrates superior weather stability against UV aging and moisture. • Improved flame retardancy and self-cleaning properties overcome traditional wood defects. Passive daytime radiative cooling (PDRC) technology offers a zero-energy route to reducing temperature. Yet, many existing materials rely on petrochemical components or face practical limitations, such as flammability, hydrophilicity, and poor weather resistance. Herein, we developed a sustainable, highly stable radiative cooling wood composite (CWC) by coating a cellulose acetate (CA) binder and nano-silica (SiO 2 ) onto a delignified wood framework. The delignified wood and nano-SiO 2 particles of CWC together provide a high solar reflectance of 93%. At the same time, Si-O and C-O-C vibrational modes yield an emissivity of 0.95 in the atmospheric window. Such CWC achieves about 7 °C daytime and ∼10 °C nighttime sub-ambient cooling. In addition, the CA/SiO 2 coating endows the CWC with strong weather resistance (solar resistance), hydrophobicity (contact angle of ∼120°), self-cleaning properties, and markedly improved flame retardancy. Overall, this work offers a practical route for designing high-performance, sustainable PDRC materials. Download: Download high-res image (168KB) Download: Download full-size image

Metasurface-Enabled Light-Driven Liquid Crystal Elastomer Actuators

Ming Cheng,Zhenming Wang,Xueqian Zhao,Mengjia Cen,Jianxun Liu,Jianxin Song,Abhishek Kumar Srivastava,Yan Jun Liu

Soft actuators based on liquid crystal elastomers (LCEs) offer programmable shape-morphing capabilities for biomedical devices and microrobotics. However, conventional photothermal LCE actuators lack spatial selectivity in actuation, suffer from low photothermal conversion efficiency and poor wavelength versatility, which severely limit their performance, especially at the challenging 980 nm window. Here, we introduce a plasmonic metasurface strategy that enables spatially selective, high-efficiency photothermal actuation. By patterning designed gold nanostructures onto LCEs, we create programmable “hot spots” that drive localized deformations under NIR illumination. This platform achieves unprecedented combined performance at 980 nm, including high photothermal conversion efficiency, low driving power, and competitive response times, while enabling patterned actuation. Moreover, we employ photoluminescence thermography to directly visualize and quantify thermal gradients generated across the LCE film, providing crucial insights into the spatiotemporal thermal dynamics. We also provide a comprehensive analysis from nanoscale plasmonic heating to macroscopic heat transfer. By integrating metasurface patterning with photoalignment, we demonstrate diverse actuation modes, from simple 2D bending to complex 3D morphing. This work establishes a new paradigm for high-performance soft actuators, opening avenues for advanced applications in soft robotics, adaptive optics, and intelligent responsive systems.