Self-powered smart windows are desirable with the expectations of their energy-saving, weather-independent, user-controllable, and miniature performance. Recently developed solar- or thermal-powered largely depend on weather conditions have an extremely slow response, only a certain portion saved energy can be utilized by external circuit for mode conversion. In this work, self-powered normally transparent window was conjunction rotary freestanding sliding triboelectric nanogenerator...

Smart windows which switch between transparent and scattering states can be used not only as privacy window in buildings cars, but also information displays, motorcycle helmet visors. Here, we have proposed a reverse mode polymer-stabilised liquid crystals (PSLCs) smart based on inhomogeneous alignment surface, greatly enhances the haze by 42% when compared to device without inhomogeneity treatment. A 100-cm2 that switches power-off clear state (~4% haze) power-on (64% at 15 V) less than 3.5...

We propose here a novel multi-layered waveguide liquid crystal (LC) smart window with full color rendering based on polymer-network system. The inserted position of three-primary-color LED light bars is specially designed, which parallel to the LC alignment obtain higher difference between transparent and scattering states. optimal matching system experimentally achieved by comparing several groups reactive mesogen materials. prepared measured analyzed in detail including optical/chromatic...

Abstract Polarization emission from halide perovskite is expected to bring a lot of benefits for next‐generation displays, such as cost down, wide color gamut, and structure simplification. In this work, strong linearly polarized luminescence emissive perovskites modulated by photoaligned azobenzene dye AD1 demonstrated. The functionalized thin films not only exhibit exceptionally high degree polarization (DOP) 86.2–93.1% red, green, blue emission, but also promise an improved environmental...

Liquid crystals have proven to provide a versatile experimental and theoretical platform for studying topological objects such as vortices, skyrmions, hopfions. In parallel, in hard condensed matter physics, the concept of phases order has been introduced context spin liquids investigate emergent phenomena like quantum Hall effects high-temperature superconductivity. Here, we bridge these two seemingly disparate perspectives on topology physics. Combining experiments simulations, show how...

Air-flow sensing is essential in broad applications of weather forecasting, ocean monitoring, gas leakage alarming, and health monitoring. However, severe environments where electrical power supply cable connection are not available, the air flow a self-powered way challenging issue. In this work, we reported tribo-induced smart reflector to achieve wireless by combining an aerodynamics-driven triboelectric nanogenerator (TENG) silver-coated polymer network liquid crystal. Upon being driven...

Pancharatnam-Berry phase optical elements (PBOEs) have received much attention due to their ability generate complex structured light or manipulate the shape of a beam. This work demonstrates tunable liquid crystal (LC) (LCPB) lens using simple and cost-effective PB hologram setup thermal polymerization form an irreversible photo-patterning alignment layer. The LCPB with high photo-stability supports ultra-broadband operation provides diffraction efficiency ∼90% throughout visible spectral...

Abstract Fiber‐optic sensors have been developed to monitor the structural vibration with advantages of high sensitivity, immunity electromagnetic interference (EMI), flexibility, and capability achieve multiplexed or distributed sensing. However, current fiber‐optic require precisely polarized coherent lasers as lighting sources, which are expensive in cost suffer from power supply issues while operating at outdoor environments. This work aims solving these issues, through developing a...

A front polarizer-free optically rewritable (ORW) liquid crystal display (LCD) has been made via a hybrid alignment configuration with dye-doped LCs. The structure consists of one active planar and passive homeotropic layer. rewritability the device is achieved by photo-reorienting azo dye molecules in doped LCs to function as polarizer following LCs' direction guest-host effect so that can be eliminated. This makes more compact easier operate for image erasing rewriting. rewriting time only...

Great impact of surface plasmon polaritons (SPPs) on photorefractive effect in ZnSe/liquid crystal interface was observed and studied dye pyrromethane 597 doped 4,4'-n-pentylcyanobiphenyl (5CB) liquid (LC) cells sandwiched with ZnSe coated ITO glass plates. Locally electrostatic modification charge carrier density makes possible visible light excitation SPPs the LC/ZnSe interfaces. A tentative physical picture SPP mediation proposed elucidating associated findings, including photoinduced...

Conventional ocean wave observation instruments are powered by batteries, limiting the continuous time. Besides, waste of batteries brings environmental contaminations. Triboelectric nanogenerators (TENGs) can reveal information through their electrical output, taking triboelectric charge as carrier. However, amplification is necessary, consuming additional energy. Herein, photons rather than electrons carrier, we developed a fully self-powered natural light-enabled sensing system for...

A novel azo dye stabilization method was presented that only requires single‐shot UV light exposure. The proposed photoalignment layer offers highly acceptable thermal and photo‐stability, as well low pre‐tilt angle (0.2°) image sticking (1.01). Also, high VHR (99%) RDC (<10mV) comparable to of PI rubbing have been achieved. Furthermore, the ability multi‐domain alignment has demonstrated shows a great potential in wide range electro‐optical devices.

Adv. Opt. Mater. 2020, 8, 1901824 The authors of article number 1901824, published in volume issue 7 (April 2020) Advanced Optical Materials, regret that they missed the contribution from Valery V. Vashchenko and Olena Vashchenko. Both, Dr. O. are State Key Lab Displays Optoelectronics Technologies, Hong Kong University Science Technology, Clear Water Bay, Kowloon, Kong. They contributed to this work by proposing idea making broadband AD-1 material which was used as dichromic dye our device....

A response time as short 5.4 ms and an exponential gain coefficient large 1795.0 cm(-1) were obtained in C(60) doped 4,4'-n-pentylcyanobiphenyl liquid crystal cells sandwiched with two indium tin oxide glass plates coated nanoscale photoconductive ZnSe films, which is believed to be facilitating charge-carrier generation transportation and, hence, responsible for the fast rate. The surface-mediated photorefractive effect interlayers both behind high coefficients. two-dimensional diffraction...

In this article, a photoalignment layer, based on the azo dye and liquid crystal polymer (LCP) composite is proposed. The alignment layer offers easy processing high photo thermal stabilities. VHR (99.1%) low RDC (30mV) have been achieved that comparable with conventional PI rubbing layer. proposed shows pre-tilt angle small image sticking which highly desirable for IPS display. Furthermore, ability of multi-domain has demonstrated great potential to find applications in range...

The ability to continuously alter the light transmittance through a window is significant for many optoelectronic devices. However, such versatility usually comes with additional unwanted power consumption. Here, we demonstrate transmittance-tunable glass that operates without electrical power. key element device an axis-varying polarizer, which combines photoalignment technique dichroic dye self-assembly mechanism. By linear translation of one patterned polarizer respect other, different...

Current ocean wave observation is achieved by separate battery-powered sensing and signal transmission modules. Owing to the limited electrical supply information channel space, long-time span restricted only height period rather than whole profile are sent back receiver. In this work, a self-powered system was developed polymer network liquid crystal (PNLC)-based smart reflector powered tailored triboelectric nanogenerator embedded with one-way overrunning clutches. The off-shore modulated...

Smart windows are attractive because of their numerous advantages such as elegance in construction design and energy conservation. with variable transmission especially desirable for obvious reasons. The simplest way to make a smart window is use two patterned polarizers, control the by changing relative position polarizers. We have demonstrated high‐dichroic‐ratio polarizer photoalignment proposed simple one‐step photo‐copy method realize continuous axis varying polarizer. shows high...

Broadband quarter waveplate can be treated as a circular polarizer providing true dark in the display system. wave plate consists of two waveplates with different alignment direction using coating technique is proposed and fabricated. The reflection spectrum shows good state

In this article, we present a high performance smart window via micro‐domains manipulation on the alignment surface, which dramatically enhances power‐on haze by 48%. Large‐scale with ultra‐hazy state switching in less than 3.5 ms is demonstrated.