5 results about "Blue band" patented technology

The present disclosure provides a Group II-VI core-shell quantum dot and a preparation method therefor. A quantum dot shell having a gradient alloy structure is gradually grown by using a precursor that has a reactivity gradient. The gradient alloy structure has a band gap that gradually increases from inside to outside, thereby solving the problem of difficulty in epitaxial growth caused by a decrease in the surface activity of a quantum dot along with an increase in the size thereof. By using zinc halide and octanethiol to regulate crystal facets, the proportion of polar facets on the surface of the quantum dot is increased, and the stability of the quantum dot is significantly improved. Moreover, provided is a low-cadmium quantum dot core. A hot-injection method is used to perform nucleation and growth of ZnSe at a high temperature, a cadmium precursor is then added after the stable nucleation of ZnSe, and cadmium / zinc ion exchange is performed by utilizing the binding energy of selenium / cadmium that is stronger than that of selenium / zinc, thereby forming a CdZnSe ternary core, which can solve the problem of it being difficult for blue-light quantum dots that use CdZnSe as a light-emitting core to cover the pure blue band.

The application discloses a kind of based on sentinel-2 satellite image's duckweed type eutrophication water monitoring method, it is related to water monitoring technical field, including the following steps: after the atmospheric correction processing of sentinel-2 L1 C level satellite image of non-duckweed growing season and duckweed growing season, all wavebands are resampled to the same resolution, after mean filtering to the blue band, green band, red band, near infrared band, narrow near infrared band of multi-band surface reflectance image after resampling of non-duckweed growing season and duckweed growing season, then band synthesis is carried out, obtain non-duckweed growing season band synthesis image and duckweed growing season band synthesis image;The proportion of duckweed growing range in water range is calculated using non-duckweed growing season band synthesis image and duckweed growing season band synthesis image.The present application can realize the fast, large-scale, low-cost duckweed type eutrophication water monitoring.

The present disclosure provides a II-VI core-shell quantum dot and a preparation method thereof. By using a precursor with a gradient change in reactivity to gradually grow a quantum dot shell with a gradient alloy structure, the gradient alloy structure has a gradually increasing band gap from the inside to the outside, solving the problem that quantum dots are difficult to be epitaxially grown due to the decrease in surface activity with the increase in size. By using zinc halide and octyl mercaptan for crystal face regulation, the proportion of the polar surface of the quantum dot surface is increased, and the stability of the quantum dot is significantly improved. Furthermore, a little-cadmium quantum dot core is provided, by using a hot injection method to perform nucleation and growth of ZnSe at a high temperature, and then adding a cadmium precursor on the basis of stable nucleation of ZnSe, using the stronger binding energy of selenium / cadmium than selenium / zinc for cadmium / zinc ion exchange, and then forming a CdZnSe ternary core, the problem that it is difficult for a blue quantum dot with a CdZnSe light-emitting core to cover a pure blue band can be solved.

Light-emitting diode module, LED module, which is configured to emit white light, wherein the LED module has: a blue light-emitting diode (30) configured to emit blue light with a first peak wavelength in a range of 420 nm to 465 nm; at least one wavelength conversion material (54, 56) configured to convert part of the blue light into converted light of another wavelength; and a near-infrared wavelength conversion material (58) configured to be excited by the blue light of the blue light-emitting diode (30) to emit an additional light with a second peak wavelength in a range of 740 nm to 900 nm and a full width at half maximum (FWHM) of 120 nm or less, wherein the near-infrared wavelength conversion material (58) Ca(Al 12-x-y ,Ga y )O 19 :xCr 3+ (0≤x≤1, 0≤y≤6) exhibits, where the converted light, another part of the blue light, and the additional light combine to form the white light, and wherein a spectrum of the white light thus formed has a peak intensity in the range of 740 nm to 900 nm, and the peak intensity is greater than or equal to 4.5% of a peak intensity in a blue band from 420 nm to 465 nm.

This invention discloses an RT-RPA-LFD primer set, detection method, and application for detecting Rehmannia glutinosa burn virus, belonging to the field of plant virus detection technology. The primer set includes the forward primer ReTV-RPA-4F, the biotin-labeled reverse primer ReTV-RPA-4RP, and the FAM-labeled probe ReTV-RPA-4-PE. This invention establishes an RT-RPA-LFD detection method based on this primer set. Using Rehmannia glutinosa sample cDNA template, amplification is performed at 36 ℃ for 15 min. The amplified products are visually detected using an LFD test strip. A positive result is indicated when the control line of the LFD lateral flow chromatography test strip shows a blue band and the test line shows a red band; a negative result is indicated when the control line shows a blue band and the test line shows no red band. The primer set of this invention has high specificity, can simultaneously detect ReTV1 and ReTV2, and shows no cross-reactivity with other Rehmannia glutinosa viruses; the detection sensitivity is 10 times higher than RT-PCR. 4 It is easy to operate, requires no expensive instruments, and provides intuitive results. It is suitable for rapid detection at the grassroots level and in the field, providing technical support for early warning and prevention of ReTV.