Views: 1 Author: Site Editor Publish Time: 2022-06-15 Origin: Site
5. Gallium oxide-based solar-blind UV detectors
In December 2021, a research team from Liaoning Normal University made a metal-semiconductor-metal (MSM) solar-blind UV detector based on a single phosphorus-doped β-Ga2O3 micron wire, which successfully achieved high response to 254 nm UV light.
The researchers used chemical vapor deposition to produce a micron line with a phosphorus content of 2.3%, a solar-blind ultraviolet detector with a light-dark current ratio of about 2 × 103, a rise time of 47 ms, and a fall time of 31 ms,the photoresponsivity and external quantum efficiency of the device can reach 6.57 A/W and 3213%. The photoresponsivity and external quantum efficiency decrease with the increase of optical power, indicating that the solar-blind UV detector has a good application prospect in the detection of weak UV light.
This study also shows that the UV detection performance of gallium oxide devices can be effectively improved by doping, which provides a new idea for the practical application of gallium oxide UV detectors.
6. Ultraviolet light UV-C regulates the growth of green pepper fruit
In July 2021, the research team of the Vegetable Center of the Beijing Academy of Agriculture and Forestry (National Vegetable Engineering Technology Research Center) and researchers from the University of Nottingham in the United Kingdom and Cornell University in the United States found through research that ultraviolet light UV-C irradiation has a negative effect on green pepper fruit harvesting. Post-ripening senescence plays a key role, providing a new basis for the research on the regulation mechanism of postharvest quality deterioration of green pepper fruits.
Using green bell pepper fruits as materials, the researchers used a combination of whole transcriptomics and metabolomics methods to deeply explore the regulation mechanism of common ultraviolet light UV-C irradiation on postharvest ripening and senescence of green bell pepper fruits. The differences in the expression profiles of mRNAs and ncRNAs in the control group and the treatment group were analyzed, and a ceRNAs network model was constructed to coordinately regulate the postharvest ripening and senescence of green pepper fruits. The study found that UV-C irradiation treatment mainly affected the expression of biosynthetic pathway-related genes and metabolites such as flavonoids, phenylalanine, tyrosine, tryptophan and phenylpropanoid in green pepper fruits.
The research results are the first in the world to use a combination of whole transcriptome and metabolomics to reveal the molecular mechanism of UV-C irradiation in regulating the postharvest ripening and senescence of green pepper fruits. provides new lessons.
