Counterfeit money can be used for anti-counterfeiting nemesis rare earth luminescent materials

Have you ever had the experience of receiving counterfeit do ? This experience , even though we are not experienced , but also talked about how to listen to the people around them . Or bank cashier at the mall , see the staff with the detectors identify money, seems to be very ordinary things , convenient and safe behind , "technology " is how to expose counterfeit veil ?

Put a blend a blend yuan into the fluorescence detector, UV light irradiation at 365nm fast inventory encounter counterfeit money detector will sound the alarm . The principle is very simple , the RMB is manufactured using special paper , while counterfeit usually treated bleached plain paper, plain paper by bleaching of ultraviolet irradiation, will Blu-ray diffraction of Yingying , the so-called " fluorescent response " , which touches alarm system, screening out the counterfeit. This is the use of " light-induced color reaction ," one of the most typical for anti-counterfeiting applications .

In this process , rare earth then played a key role.

PL spectra of rare earth behavior is often used in anti-counterfeiting technologies , these technologies are some counterfeiters are some superb grasp , forcing anti-counterfeiting technology advances not always kept up to date , ahead of counterfeiters . Therefore, in most cases , using a set of anti-counterfeiting technology, but also reserves , development of a new technology. Beijing Technology and Business University, Faculty of Science Professor Sun Jiayue has been engaged in anti-counterfeiting materials research and development , he has presided over the "ff fd electronic transitions with ultraviolet and infrared photoluminescence emission chromogenic anti-counterfeit marking materials " and other three Beijing Natural Science Foundation of China , around the continuously improve the technical Suimi of anti-counterfeiting materials , exclusivity and anti-attack capability and other aspects of the application of the basic work , described as " magic goes , the road climbs ."

Daily life, we usually put a variety of faint light are called " fluorescent " , few people would go carefully investigate and distinguish a variety of fluorescent light-emitting principle . " Fluorescence is a light emitting cooling phenomenon," Professor Sun Jiayue explains , in essence, is a kind of electronic transition emission phenomena .

Electronic transitions are constituent materials emitting particles ( atoms, ions or molecules ) an electron energy state changes. According to the principle of conservation of energy , the particle outer electrons from low level to a higher energy level transition process will absorb energy ; transition from a high energy level will return to a lower level in the form of fluorescence energy is released , fluorescent colors level corresponds to the energy difference between the two levels .

At room temperature, when a substance by one kind of incident light ( usually ultraviolet or X -ray ) irradiation, it will absorb the light from the ground state into the excited state , when the material from the excited state back to the ground state, will be in the form of fluorescent the excitation energy released. Once stopped the incident light , luminous phenomenon disappeared. This nature of the emitted light is called " fluorescence ." When the object by external light source to obtain energy, resulting in the phenomenon of luminescence excitation leading called " photoluminescence ."

The " Photoluminescence " is used for " banknotes " is a technology innovation. In all phenomena can produce photoluminescent material , the most important one is the rare earth elements. Rare earth ions have unfilled 4f electron configuration , has a rich spectrum of energy levels and long term life excited state , which can produce a wide variety of radiation absorption and emission . Constituted by the rare earth compounds of rare earth ions in the excited state, can be emitted from the infrared light , visible to the ultraviolet region of the electromagnetic radiation of various wavelengths , the light rare earths into a huge treasure.

"We are the choice of a particular rare earth ions as activator , R & D for ultraviolet or infrared light source rare start photoluminescence and the chromogenic material , thereby seeking to stable performance , high brightness materials , and synthetic printing inks, to determine the best ratio, ultimately making counterfeit labels applied to actual production . " Sunjia Yue said.

From the use of , the photoluminescent material is not limited to anti-counterfeit labels can also be used to produce electroluminescent materials, LED fluorescent powder , super long afterglow ( night out ) materials, auxiliary materials, solar cells , infrared up-conversion materials, electron capture materials, etc. , can be described as widely used. China rare earth industry in the world's resources reserves and production in the first place , however, the Chinese are about 2 /3 of the rare earth export outflows , and the prices of rare earth products has long been controlled by foreign businessmen .

" Rare is very important to our country 's mineral resources, mainly as a raw material exports of rare earth in the past , especially as the lack of features , and low-tech products of blind production , resulting in China's rare earth product characteristics of small differences , which are on the China's rare earth resources, resulting in a great waste and only focus on the development and high-tech rare earth functional materials, will put China's rare earth resources into production advantages, the technological advantages into economic advantages , rich riding . " Sunjia Yue said.


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