Young researcher from cluster of Laboratory of Bioengineering and International Laboratory of Hybrid Photonic Nanomaterials wins RF Presidential grant

Viktor Krivenkov, Ph.D., of the cluster of Laboratory of Bioengineering and International Laboratory of Hybrid Photonic Nanomaterials, has won the competition for grants of the President of the Russian Federation for support of young researchers with Ph.D. degree (Competition MK 2020, https://grants.extech.ru/grants/res/winners_list_new.php?year=2020&TZ=K). The basic and applied research project proposed by Dr. Krivenkov is aimed at development of hybrid plasmon–exciton light-emitting materials with enhanced photoluminescence based on semiconductor nanocrystals and metal nanoparticles.

The goal of the project is to increase the efficiency of photoluminescence of semiconductor nanocrystals by making use of near-field interaction with plasmonic nanostructures and formation of light–matter coupling, with a view of applications to medical diagnosis and optoelectronics.

 

In the past decade, fluorescent nanocrystals, such as quantum dots, have been attracting increasingly much attention as a material for light-emitting devices, bioimaging, and medical diagnosis. Quantum dots, less than 10 nm in size, have a wide absorption spectrum, narrow luminescence spectrum, quantum efficiency close to 100%, and uniquely high brightness determined by extremely large absorption cross sections. Together with a high photostability, this ensures substantial comparative advantages over organic dyes. Light-emitting devices based on quantum dots (QD-LEDs) and thin-film displays with improved color saturation and luminosity, as well as a high color rendering index (CRI), have already become ingrained in practice. Owing to the small sizes of quantum dots and their high stability in biological media, these nanomaterials can also be used in novel detection and diagnostic systems, as well as in hybrid materials capable of efficiently converting light energy.

Metal plasmonic nanoparticles (PNPs) have orders of magnitude higher extinction coefficients per unit volume compared to semiconductor quantum dots. This makes them uniquely effective light-absorbers among all known nanomaterials. However, the photoluminescence capacity of PNPs is extremely low, which precludes their use as a fluorescent material. The effects of near-field interaction occurring at distances of about 10 nm between PNPs and quantum dots allow combining the advantages of these types of nanoparticles. When a plasmonic nanoparticle absorbs light energy, oscillations of electron density (plasmons) are excited in it, which leads to concentration of electromagnetic field energy near the PNP surface. This energy is absorbed by closely located semiconductor quantum dots. This effect is expected to cause further increase in the intensity of photoluminescence of the semiconductor nanocrystals, which could substantially enhance their advantages over organic fluorophores and further extend their practical applications.

Contacts:

Viktor Krivenkov, Ph.D., research fellow (vkrivenkov@list.ru)

Maria G. Korenkova, director of external relations (MGKorenkova@mephi.ru)

Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute
31 Kashirskoe shosse, 115409 Moscow, Russian Federation

http://www.lnbe.mephi.ru/en

 
 
 
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