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LEDs emit ultraviolet light

02.03.2012

Scientists at Los Alamos National Laboratory have created LEDs that emit ultraviolet light.

The unique light source is based on glass and inorganic nanocrystals. They are cheap to manufacture, reliable, and chemically stable, making UV LEDs suitable for medical use.

Ultraviolet LEDs are in great demand in medicine and biomedical diagnostics. They can be used in the laboratory on a chip or as implantable light sources that cause certain photochemical reactions. Such devices can, for example, selectively activate photosensitive preparations or illuminate fluorescent markers.

However, so far it has not been possible to create compact cold sources of ultraviolet light, at least there was no technology for mass production of cheap miniature UV light sources. For the first time, American scientists have succeeded in making a cheap UV LED that can be integrated into silicon chips.

The new device is made from inorganic materials and combines the chemical inertness and mechanical strength of glass with a material that is electrically conductive and electroluminescent. The active part of the device consists of tin dioxide nanocrystals coated with a tin oxide shell. The electrical properties of the LED depend on the thickness of the shell, which allows it to be adjusted during the production process. Substances are deposited on a glass substrate. As a result, the new LEDs can be used in harsh environments such as immersion in saline or implanted in the body.

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PrivatBank neutralized a group of skimmers 22.01.2012

On January 18, 2012 in Lviv, the security service of PrivatBank stopped the activities of an international group of scammers-skimmers who used overlays on ATMs to steal the personal data of cardholders. According to PrivatBank, the scammers were caught red-handed while removing the lining from the bank's ATM located in Lviv. They turned out to be two citizens of Romania, who were taken to the police. During the search, electronic means for skimming and plastic cards of various Ukrainian and foreign banks were seized from the suspects.

"It is rare for anyone to catch skimmers red-handed, but today we know how to catch them," said Stanislav Krizhanovsky, head of PrivatBank's security service. The task force of security left and detained the swindlers".

According to an investigation conducted by the bank's security service, by installing an overlay on various ATMs in Lviv, fraudsters managed to steal the data of 56 payment cards of customers of various banks. In the course of the analysis of video surveillance materials for the ATM network, the involvement of these persons in other facts of skimming in the Ivano-Frankivsk region was established, the amount of damage for which amounted to UAH 27.

The fraudsters will be prosecuted under Art. 200 of the Criminal Code (“Illegal actions with transfer documents, payment cards and other means of access to bank accounts, equipment for their manufacture”), and the detainees face two to five years in prison, PrivatBank reported.

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