6results about How to "High optical contrast" patented technology

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.

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.

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.