9 results about "Emission band" patented technology

The present invention provides a light generation system configured to provide system light; wherein the light generation system includes (i) a first light generating device, (ii) a second light generating device, and (iii) a light-emitting material device; wherein: (A) the first light generating device includes a first solid-state light source, the first solid-state light source being configured to generate first light source light having a wavelength selected from the wavelength range of 430-490 nm; wherein the first light generating device is configured to generate first device light; (B) the light-emitting material device includes a first light-emitting material, the first light-emitting material being disposed downstream of the first light source and configured to convert at least a portion of the first light source light received by the first light-emitting material into first light-emitting material light having a first spectral power distribution in the visible wavelength range, the first spectral power distribution having a first centroid wavelength (λc1); wherein the first centroid wavelength (λc1) is selected from the wavelength range of 615-645 nm; wherein the first light-emitting material light includes one or more emission bands having a first full width at half maximum (FWHM1), the first... The full width at half maximum (FWHM2) is selected from a range up to 40 nm; wherein the first luminescent material comprises a luminescent material of the type doped with tetravalent manganese, wherein M comprises an alkaline earth cation, wherein M' comprises a basic cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, and at least fluorine; (C) the second light generating device comprises a second solid-state light source; wherein the second light generating device is configured to generate second device light having a second spectral power distribution in the visible wavelength range, the second spectral power distribution having an emission band having (a) a second centroid wavelength (λc2) selected from a wavelength range of 605-655 nm, and (b) a second full width at half maximum (FWHM2) selected from a range up to 40 nm; and (D) the light generating system is configured such that (a) the first spectral power distribution and the second spectral power distribution at least partially overlap, (b); and (c) in the operating mode of the light generating system, the system light comprises (i) the first luminescent material light and (ii) the second device light.

This invention discloses a sonar signal bandwidth extension method and system based on an adaptive sparse reconstruction approach. It acquires frequency domain data of active sonar echoes through matched filtering and extracts the transmission bandwidth range of the active sonar. A physical perception dictionary containing the physical ripple characteristics of the transmitted waveform is constructed to establish a precise mapping from the sparse target space to the observation frequency band. An adaptive threshold detection mechanism is introduced during the orthogonal matched pursuit iteration process to screen potential targets using the statistical characteristics of local background noise. A meshless global optimization algorithm is used to jointly fine-tune the target position in the continuous time domain. A full-band skeleton spectrum is constructed using precise parameters, and the noise residuals in the original frequency band are back-injected and inversely transformed to obtain a high-resolution time-domain waveform. This invention significantly improves the ability to distinguish closely spaced targets and the detection performance of weak targets in complex underwater acoustic environments.

This invention provides a thorium-doped fluoride crystal, its preparation method, and a solid-state nuclear optical clock using the thorium-doped fluoride. The thorium-doped fluoride crystal uses SrF2, LiF, BaF2, and LiF+BaF2 as matrix materials, respectively, and ThF4 as a dopant material. Single crystals of Th:SrF2, Th:LiF, Th:BaF2, and Th:BaLiF3 are obtained through a melt growth process according to a pre-set molar percentage of the raw materials. The thorium-doped fluoride crystal of this invention has a low melting point and simple composition, which is beneficial for achieving high-quality crystal growth. It has an extremely wide band gap, high transmittance in the vacuum ultraviolet band, and a high Th doping concentration, which helps reduce absorption loss and background luminescence in the nuclear transition emission band, and is beneficial for the excitation and detection of nuclear transition signals. It can be used as a preferred material for applications based on… 229 A solid-state nuclear optical clock based on the transition of the Th atom nucleus.

The invention provides a light generating system (1000) configured to generate in an operating mode system light (1001) having a spectral power distribution with at least 85% of the spectral power in emission bands (111, 121, 131, 141) in four basic wavelength ranges each with a maximum width of 50 nm, of which at least three of the four basic wavelength ranges are selected from a first wavelength range of 452 nm + / - 25 nm, a second wavelength range of 504 nm + / - 25 nm, a third wavelength range of 560 nm + / - 25 nm and a fourth wavelength range of 617.5 nm + / - 25 nm, wherein the emission bands (111, 121, 131, 141) have a full width at half height of at most 30 nm.

The invention provides a light generating system (1000) comprising a first solid state light source (10) and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 380-490 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210), a second luminescent material (220), and a third luminescent material (230); (C) the first luminescent material (210) comprises a luminescent material of the type M'xM2-2xAX6:Mn4+, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (D) the second luminescent material (220) comprises one or more of a divalent europium comprising nitride luminescent material, a divalent europium comprising oxynitride luminescent material, and a luminescent material of the type M1−xLi3−2y(Al1-bGab)1+2y−zSizO4−4y−zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca; wherein the second luminescent material (220) is configured to convert at least part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); (E) the third luminescent material (230) is configured to convert at least part of the first light source light (11) received by the third luminescent material (230) into third luminescent material light (231); wherein the third luminescent material light (231) has a third centroid wavelength (λc3) selected from the range of 500-560 nm; wherein the third luminescent material light (231) comprises at least one emission band having a third full width at half maximum FWHM3 selected from the range of 20-80 nm; and (F) the light generating system (1000) is configured to generate system light (1001), wherein the system light (1001) comprises the first luminescent material light (211), the second luminescent material light (221), and the third luminescent material light (231); wherein the system light (1001) is white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv ≤ -0.01.

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 application discloses a gallate-based blue light-emitting material applicable to a plant light supplement lamp, a preparation method and application of the gallate-based blue light-emitting material, and a chemical general formula of the light-emitting material is Ca 1‑x Ga4O7:xCd 2+ , wherein x is 0.003-0.007. The gallate-based blue light-emitting material takes CaGa4O7 as a matrix, Cd 2+ is a doping ion, Cd 2+ cannot form a new light-emitting center in CaGa4O7, and only plays a role in enhancing blue light emission of the matrix. The light-emitting material produces a wide peak with a peak value of 445 nm under ultraviolet excitation, generates blue-white emission, and the emission band is highly coincident with a band required by plant growth, so that chlorophyll synthesis can be promoted, stem and leaf growth of plants is beneficial, the plant light supplement demand can be met, and the optimal afterglow duration can reach nearly 2 hours. The light supplement can still be carried out after stopping excitation, and energy consumption is reduced.

This invention discloses a method for fast range ambiguity resolution of short-period direct-sequence spread spectrum signals used in radar measurement. The method comprises: 1) designing a square wave period based on the maximum unambiguous measurement range requirement; 2) transmitting a direct-sequence spread spectrum signal modulated with a square wave at the transmitting end; 3) estimating the code phase within the spread spectrum pseudocode period at the receiving end using fast circular correlation; and 4) despreading using the spread spectrum pseudocode phase estimation result and accumulating energy within the spread spectrum pseudocode period to obtain N. s The energy accumulation results are as follows: 5. The energy accumulation results within adjacent spread spectrum pseudocode periods are used to search for the square wave transition edge using a differential method to complete target detection decision and distance estimation; This invention can effectively improve the maximum unambiguous distance for capturing high dynamic weak signals, while resolving the contradiction between computing resources and acquisition time.