7 results about "Optical modulation amplitude" patented technology

The invention belongs to the technical field of micro-ring modulator optimization, and particularly relates to a micro-ring modulator feedback control system for realizing optical modulation amplitude and linearity optimization. A low-speed PAM-4 test signal easy to process is generated through a test code generation module and is pre-distorted through a feedback control module to drive a micro-ring modulator, a signal acquisition module acquires a response signal of the modulator in real time, and an eye pattern calculation module extracts current light modulation amplitude and linearity of quantitative performance from the response signal and calculates the light modulation amplitude and linearity of the micro-ring modulator. And the feedback control module synchronously adjusts the working points of the micro-ring modulator based on the indexes to optimize the light modulation amplitude, and adjusts the pre-distortion coefficient to optimize the linearity, thereby solving the problems of performance compromise and power consumption increase caused by the separation of the light modulation amplitude and the linearity optimization in the prior art. Compared with the prior art, collaborative optimization is achieved, and energy efficiency is improved while performance compromise is avoided.

The application discloses a kind of double ion modified Bi2WO6 electrochromic thin film materials and preparation method thereof, and relates to the field of electrochromic thin film.The preparation method of the application includes the following steps: (1) hydrothermal controllable preparation Bi2WO6 Nanometer powder;(2) using hydrogen ion and alkali metal ion to Bi2WO6 Nanometer powder is carried out double ion replacement reaction to modify Bi2WO6 Crystal lattice structure;(3) the Bi2WO6 Nanometer powder after double ion modification is made into the nanometer dispersion liquid with good dispersibility, then double ion modified Bi2WO6 electrochromic thin film material is obtained by spin coating process.The method retains the key structural characteristics of precursor phase by soft chemical modification, and the double ion modified Bi2WO6 electrochromic thin film shows excellent electrochromic performance in near-infrared band, and the optical modulation amplitude is greatly increased.The preparation method is simple, safe and controllable, low in cost, and has wide application prospect.

This invention relates to a nickel-manganese bimetallic hydroxide / oxide electrochromic thin film, its preparation, and its application. The electrochromic thin film of this invention is directly grown on the surface of fluorine-doped tin dioxide (FTO) conductive glass via a hydrothermal method. The specific steps are as follows: First, nickel source, manganese source, urea, and ammonium fluoride are dissolved in deionized water, then transferred to a hydrothermal reactor. An FTO conductive glass is placed in the reactor with its conductive side facing down. After a period of constant-temperature hydrothermal reaction, it is naturally cooled to room temperature. The FTO conductive glass is then removed from the reactor, cleaned, and dried to obtain the nickel-manganese bimetallic hydroxide electrochromic thin film. After calcination at a certain temperature, a nickel-manganese bimetallic oxide electrochromic thin film is obtained. Compared with single nickel oxide and manganese oxide, the NiMnLDH thin film of this invention exhibits a larger light modulation amplitude in the visible light region and higher transmittance in the faded state, making it applicable to electrochromism and related fields.

The invention discloses a method for constructing a complementary electrochromic device based on a nickel-cobalt double-metal hydroxide film. A nickel-cobalt double-metal hydroxide (NiCo-LDH) thin film is used as a working electrode, a tungsten oxide (WO3) thin film is used as a counter electrode, a sealed cavity is formed between the two electrodes, a bistrifluoromethanesulfonimide lithium (C2F6LiNO4S2) solution is used as an electrolyte and injected into the sealed cavity, and the lithium ion battery is obtained. The invention further provides the complementary electrochromic device constructed by adopting the method. The fading state of the device is colorless, and the coloring state is dark blue. The complementary type electrochromic device has large light modulation amplitude, faster time response and higher coloring efficiency in a visible region and a near-infrared region, and compared with traditional NiO, the nickel-cobalt double-metal hydroxide film has higher theoretical specific capacity and faster ion migration rate and is used as an anode ion storage layer of the complementary type electrochromic device, so that the complementary type electrochromic device can be applied to the field of electrochromic devices. And the charge storage capability of the device can be obviously improved.

The application discloses a vanadium-tungsten bimetal oxide electrochromic film and a preparation method thereof, and the preparation method comprises the following steps: S1, dissolving ammonium paratungstate hydrate, ammonium metavanadate and oxalic acid dihydrate in deionized water to obtain a hydrothermal reaction precursor solution after stirring; and S2, performing a hydrothermal reaction on conductive glass, and thus the vanadium-tungsten bimetal oxide electrochromic film is obtained. The controllable synthesis of the vanadium-tungsten bimetal oxide film is realized by controlling the molar ratio of vanadium and tungsten in the precursor solution. The application further discloses a vanadium-tungsten bimetal oxide electrochromic film prepared by the method and an electrochromic device comprising the film. The vanadium-tungsten oxide film prepared by the application has a unique nano hexagonal star structure, high specific surface area and excellent structural stability, can not only improve the rich electrochemical reaction active sites and significantly improve the area capacitance of the film material, but also improve the cycle stability, and has a high light modulation amplitude and a high coloring efficiency.

The invention provides a WO3-gamma film based on periodic alternate oxygen supply three-path coordinated regulation and a preparation method and application thereof. According to the preparation method, periodic alternate regulation of oxygen flow is implemented in the magnetron sputtering process, so that three-path coordinated regulation of oxygen vacancies, porous morphology and an amorphous / nanocrystalline coexisting structure in the WO3 film is realized, and the electrochromic response rate and cycling stability of the film in an aqueous electrolyte are remarkably improved. The prepared WO3-gamma film has more than 70% of optical modulation amplitude, the coloring / fading response time is less than 0.03 second, and the CV curve area is still kept more than 97% after 500 cycles. The composite material has excellent electrochemical performance, structural stability and environmental friendliness, and can be widely applied to the fields of water system intelligent windows, electrochromic display, wearable devices and the like.

This invention discloses a tungsten oxide / titanium oxide (WO₃ / TiO₂) heterogeneous composite electrochromic thin film and its one-step hydrothermal preparation method, belonging to the fields of functional materials and optoelectronic technology. The method first involves heating tungstic acid and hydrogen peroxide to form a peroxytungstic acid solution, which is then mixed with acetonitrile and hydrochloric acid to prepare a stable precursor solution. Tetrabutyl titanate is pre-reacted with hydrochloric acid to obtain a titanium source solution. The two are then mixed in a specific ratio to prepare a composite precursor solution. A thin film is directly deposited on a conductive substrate using this precursor solution via a one-step hydrothermal reaction, followed by annealing to obtain the WO₃ / TiO₂ heterogeneous composite thin film. This invention achieves the synergistic growth and uniform composite of WO₃ and TiO₂ during the hydrothermal process through precise design of the precursor solution system. The process is simple, low-cost, and has good reproducibility. The resulting thin film exhibits uniform two-phase distribution and a distinct heterojunction structure, combining high optical modulation amplitude, fast response, and excellent cycling stability. The optical modulation amplitude can reach over 45% at a wavelength of 633 nm, and the retention rate exceeds 70% after 1000 cycles, making it suitable for high-performance electrochromic devices such as smart windows and displays.