12results about How to "High optical contrast" patented technology

The invention relates to a monomer containing 7-methyldibenzo [c, g] carbazole and triphenylamine, namely 4-({9-[(4-aminophenyl) (4-methoxyphenyl) amino]-7-methyldibenzo [c, g] carbazole-5-yl} (4-methoxyphenyl) amino) aniline and a preparation method and application of polyamide. In order to solve the problems that polyamide materials are low in solubility in organic solvents, difficult in film forming, poor in cycling stability, narrow in color changing range and single in function, two triphenylamine groups are constructed on 7-methyldibenzo [c, g] carbazole, and methoxyl is introduced to triphenylamine, so that the solubility and the stability of the polymer are improved; the polymer disclosed by the invention has excellent electrochromic performance, excellent cycling stability, fast switching time and high optical contrast. Meanwhile, in order to solve the multifunctionality of the material, a naphthalene unit is added into the molecular structure, and the polymer has fluorescence emission. The fluorescent probe can be applied to the fields of display, rearview mirrors and camouflage and fluorescence detection of p-trinitrophenol.

The present application relates to the field of organic electrochromic materials, and particularly relates to a transparent conductive material, a preparation method and application. The transparent conductive material simultaneously introduces two independent carbonyl groups in a molecular main chain, and realizes accurate coordination of energy level, polarity and charge transport performance through differential regulation of oxygen or nitrogen atoms. The polymer can be used as an ion storage layer, an electrode modification layer or an active functional layer in an electrochromic device, can realize fast reversible optical modulation at a low voltage (±1.0 V), has a high optical contrast (ΔT 550 > 65%), a short response time (<2 s) and excellent cycle stability (more than 3×10 4 times of cycles, a retention rate >95%), and has a wide application prospect in the fields of intelligent display, energy-saving buildings and flexible electronics.

The invention discloses preparation and application of a terpyridyl iron coordination polymer based on anthraquinone bridging. The organic iron coordination polymer material provided by the invention has the advantages of simple synthesis route, mild conditions and low cost. A device prepared by adopting the terpyridyl iron coordination polymer based on anthraquinone bridging, designed by the invention, shows an electrochromic function under applied voltage, has relatively high optical contrast, relatively high response speed and good cycle stability, and has potential application value.

This invention relates to conjugated polymers containing dibenzofuran (thiophene) and carbazole units, their preparation methods, and applications. To address the problems of poor optical contrast, slow response time, and poor cycling stability of existing conjugated polymers as electrochromic materials, this invention uses 2,8-dibromodibenzofuran or 2,8-dibromodibenzothiophene as reactants, reacting them with 9-hexyl-3,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxoborane-2-yl)-carbazole or 9-phenyl-3,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxoborane-2-yl)-carbazole to form conjugated polymers with dibenzofuran (thiophene) and carbazole units in the main chain. The conjugated polymers of this invention exhibit excellent electrochromic properties, including excellent cycling stability, fast switching time, high optical contrast, and low voltage start-up. This invention is expected to be applied in fields such as smart windows, rearview mirrors, military camouflage, and electronic tags in the construction and automotive industries.

The present application adopts inkjet printing and non-catalyst chemical nickel plating method to deposit metal nickel on transparent nylon net and silk net, realizes the preparation of low-cost large-scale flexible transparent conductive substrate with controllable morphology, and is suitable for large-scale mass production. The present application is very beneficial to the integration of planar microelectronic devices. Based on the technology, a flexible transparent Zn net electrode is prepared by electroplating Zn on the Ni-P pattern nylon net. The ZECD window with zinc net anode and prussian blue (PB) cathode shows significant electrochromic performance, including fast switching time, high optical contrast and excellent cycle performance. These ZECDs are also very suitable for solar charging intelligent windows, which can further solve the problem of solar intermittency. These findings open up new opportunities for energy storage and conversion transparent devices.

The invention relates to triphenylamine polyamide containing a quinoxaline structure and a preparation method and application of the triphenylamine polyamide. The invention relates to the triphenylamine polyamide containing the quinoxaline structure and the preparation method and application of the triphenylamine polyamide containing the quinoxaline structure. The invention aims to prepare polyamide with excellent chemical stability and good electrochromism capability, and solves the problems of difficulty in solution processing, poor film forming effect, poor electrochromism cycling stability and the like of polyamide. The novel polyamide containing the quinoxaline structure is formed by taking the quinoxaline structure as a mother nucleus, grafting 4-methoxy-4 '-nitrodiphenylamine to benzene rings on two sides in a derivative structure of the quinoxaline structure, reducing nitro into amino, and performing condensation polymerization on an obtained diamine monomer and dicarboxylic acid. The polyamide disclosed by the invention has good solubility and film-forming property, the absorption and fluorescence intensity of the polyamide are obviously changed in the voltage change process, and the polyamide shows high optical contrast and long-term cycling stability in the aspect of electrochromism; and under the action of the explosive, the fluorescence disappears. The material can be applied to the field of multifunctional materials for electrochromism, fluorescence display, explosive molecule detection and the like.

This invention discloses a Fe3O4@SiO2 / polyurethane composite photonic crystal sensor, its preparation method, and its applications, belonging to the field of photonic crystal sensor technology. This invention achieves spatial modulation of the C6 fluorescence signal and enhancement of the local photonic field by spectrally matching the reflection band of the structured photonic crystal with the C6 emission band. This results in significant fluorescence quenching response even under extremely low PA concentrations, overcoming the limitation of low sensitivity in traditional fluorescence detection. Compared with traditional HPLC or conventional fluorescence spectroscopy methods, the photonic crystal enhancement system of this invention can improve PA detection sensitivity by approximately 3-4 orders of magnitude, while exhibiting good reproducibility and environmental stability.

The invention provides a ferroelectric-polyacid coupled long-memory composite electrochromic film as well as a preparation method and application thereof, and belongs to the technical field of electrochromic materials and devices. The thin film is composed of FTO conductive glass, a TiO2 porous framework layer, a P2W17V polyacid layer deposited in the framework and a P (VDF-TrFE) ferroelectric functional layer, and a built-in electric field generated by polarization of the ferroelectric layer is deeply coupled with a polyacid oxidation reduction process, so that charges are effectively locked, ion diffusion is inhibited, and the limitation of traditional physical lamination is broken. The optical memory time of the prepared film is prolonged from 489.8 s to 2357.2 s, the bistable performance is remarkably enhanced, and the technological process is simple.

This invention discloses a highly stable electrochromic thin film, its preparation method, and its applications. The electrochromic thin film comprises a conductive material and an electrochromic layer. The electrochromic layer is a quasi-planar heterojunction metal oxide with a thickness of 10–1000 nm. The preparation method includes the following steps: fixing the conductive material on a sample holder and placing it in an electron beam cavity; pretreating the conductive material; and then using high-energy ion-assisted electron beam evaporation to deposit the metal oxide onto the conductive material, thereby obtaining the electrochromic thin film. This invention, employing the aforementioned highly stable electrochromic thin film, its preparation method, and its applications, overcomes the trade-off between high stability and ultrafast switching performance with the assistance of high-energy ions, exhibiting significant overall electrochromic performance, including high optical contrast, ultrafast switching speed, and excellent stability.

The present invention provides an electrochromic polymer and a preparation method and application thereof. The electrochromic polymer has a structure as shown in Formula I. In the present invention, by designing the structure of the electrochromic polymer, the prepared electrochromic polymer has a large solubility and does not generate a large steric hindrance, thereby not hindering the entry of doped particles, and is suitable for being used as an electrochromic material to prepare an electrochromic device.

The present invention relates to a blue to transparent electrochromic polymer, and its structure is as follows: wherein n represents the degree of polymerization, and n is a natural number of 8-100. The polymer can realize the conversion between the blue state and the transparent state, and has the characteristics of low driving voltage (step potential is 0V and 1.0V), high optical contrast (usually above 40%, up to 45%), and high stability (square wave potential scan 200 times still maintains good stability); the polymer is easily soluble in organic solvents such as toluene and dichloromethane for solution treatment, which is convenient for large-area film formation by spraying or scraping, and is conducive to process treatment and application.

The present invention is applicable to the field of medical imaging technology, and discloses a multi-mode imaging system, which includes a display, a multi-mode imaging device, and a host electrically connected between the display and the multi-mode imaging device, wherein an image reconstruction and processing subsystem is provided in the host, and an animal scanning control subsystem, a static computed tomography imaging subsystem, and a photoacoustic imaging subsystem are provided in the multi-mode imaging device, wherein the static computed tomography imaging subsystem includes an electronic control circuit, a multi-beam carbon nanometer X-ray source array for generating X-rays required for static computed tomography scanning, a photon counting detector for computed tomography projection data acquisition and high-speed processing, and a power supply for supplying power to the multi-beam carbon nanometer X-ray source array, wherein the multi-beam carbon nanometer X-ray source array, the photon counting detector, and the power supply are all electrically connected to the electronic control circuit. The multi-mode imaging system of the present invention has high image resolution, large imaging depth, and low radiation dose.