Carbon nanoparticles can change the lighting in the world in the future?

The day before, the Chinese Academy of Sciences Changchun Institute researcher Qu Songnan research group broke the carbon nano point problem in near infrared band low luminous efficiency, first developed with carbon nano efficient near infrared absorption / luminescence characteristics, the in vivo carbon nano point near infrared fluorescence imaging based on.

In recent years, the research group led by Qu Songnan frequently in high impact journals published. 2009 to participate in the work of Qu Songnan in the work a few years later with independent research group, it was promoted as a researcher.

Focus on carbon nano point

Qu Songnan pointed out that the light emitting carbon nano is emerging nano luminescent materials, with a small size (less than 20 nm), non-toxic, good luminous performance, good biocompatibility, good light stability, wide range of raw materials, easy modification and other advantages, attracted widespread attention at home and abroad.

Earlier, on luminescent inorganic semiconductor nanoparticles is very active, but inorganic semiconductor nanoparticles containing heavy metals (lead, cadmium), the kernel has a certain toxicity on the environment, there are hazards, so scientists begin with some non-toxic compounds for the preparation of new luminescent nano particles.

In 2006, American scientists at the University of Clemson to create a carbon nanoparticles, in light of the circumstances, can emit bright light. The scientists also found that the luminescent carbon nanoparticles have unique advantages, such as chemical stability, no flicker of light, light bleaching, non-toxic, low cost and excellent biocompatibility.

In 2012, when he was deputy researcher at the Institute of Changchun Qu Songnan's team found that based on the characteristics of carbon nanoparticles excitation wavelength dependent, with organic dyes in biological products can be built with graphic information encryption, which can be applied to the information storage and information encryption.

Schematic construction of near infrared absorption / emission of carbon nano point and the light emitting mechanism of the in figure 1. by surface electron withdrawing group modified.

The figure 2. (a) of absorption and emission spectra of carbon nano @PVP composites. (B-D) @PVP complexes with carbon nano near infrared fluorescence imaging reagent (b) and mouse stomach (c) after intravenous injection in vivo and blood circulation in the process of near infrared fluorescence imaging (D).

The figure 3. near infrared region II femtosecond multiphoton excitation of carbon nanodots induced luminescence. (a-b) 1200 nm femtosecond optical excitation and emission spectra of carbon nano - point and the luminous intensity of the excitation light power curve (C-D) 1400 nm femtosecond optical excitation and emission spectra of carbon nano - point and the luminous intensity of the excitation light power curve.

These unique properties make carbon nano point into our real life possible." Qu Songnan told reporters, then the team developed a new type of fluorescent ink. "This kind of ink can be applied to biological imaging and biological product identification, information storage, information encryption, security, sensing, display, lighting and other areas of photovoltaic devices."

To break the bottleneck of Technology

It is reported that luminescence mechanism and spectrum regulation of carbon nanoparticles is difficult in the field of study. Before 2013, the emission of carbon nanoparticles in the green light that is derived from carbon nanoparticles surface defects, and the light source are considered difficult to achieve laser.

To this end, Qu Songnan's team through the regulation of nitrogen in carbon nanoparticles, carbon nanoparticles by adjusting the blue and green light, observed the phenomenon of spontaneous emission in carbon nanoparticles amplified green wavelength, and the realization of carbon nanoparticles in the green light light pump laser for the first time.

Qu Songnan recalls: "in the past, we prove by comparing test, carbon nanoparticles light stability is better than the traditional organic dye, that carbon nanoparticles can be used as a novel laser materials a kind of low cost, green environmental protection, good light stability, lighting is expected to change the future of the world."

Subsequently, Qu Songnan and his research team first proposed the concept of "super nano carbon" in the world, and developed based on the "super carbon nano" trigger "nano fluorescent water bomb", the carbon nano materials become a new type of intelligent light emitting materials.

Carbon nano existing absorption and emission bands are mainly located in the UV visible region, still cannot achieve high absorption in the near infrared region and high fluorescence quantum efficiency of near infrared light, which severely limits the carbon nano dots in biological fluorescence imaging especially the application of near-infrared fluorescence imaging in.

In recent years, to achieve efficient near infrared emission problem, Qu Songnan research group based on the surface of carbon nano red point electron withdrawing and modification of carbon based kernel layer ordered structure disordering regulation, produced a new band gap luminescence in the near infrared band, obtained with efficient near infrared emission of carbon nano in the near infrared light excitation, fluorescence quantum efficiency reached 10%, the highest value for the international.

The high level of

It is not difficult to find, the Qu Songnan team can take control and application field of lots of research on carbon nano luminous point. Qu Songnan as the first author or corresponding author has published 29 SCI papers, the influencing factors of SCI more than 10 of the 6 papers, the first author of the paper cited the highest single SCI 390 times, the cumulative SCI cited 1630 times. Among them, two articles published in Qu Songnan ESI (Essential Science Indicators) hot and highly cited papers, to the top 1/1000 of the column.

Talk about how to publish high quality papers, Qu Songnan said modestly, it doesn't have too much, the first is the research direction must be of great value and application prospect, followed by the research contents must be the core problem in the field and present major challenges. "The two meet, the quality of the natural difference will not be published."

Currently, Qu Songnan formulated research planning in 10 years to reach carbon nano clinical application in the field of cancer diagnosis and treatment.

He said: "compared with the current development of luminescent nano luminescent materials, carbon nano point is especially suitable for in vivo fluorescence imaging and diagnosis and treatment of cancer drugs. In addition, carbon nano point fluorescence lifetime of only a few nanoseconds, far lower than the existing commercial phosphor, has important potential applications in high bandwidth communication field visible light illumination."

As young researchers, Qu Songnan suggested that young people engage in scientific research and development potential at first. "The national guide to scientific research personnel and the mechanism of measures is getting better and better, as long as the young people work hard to get support, direction." He also hoped that the country has more inclined to the Northeast in the personnel policy, and to give more policy support for young researchers in the achievement transformation.

Source: Chinese Science News

LED more information, please click on the LED network or the WeChat public account (cnledw2013).