UrFU Physicists Evaluate the Photoluminescence of Quantum Dots

13:34, August 7, 2020

The results of scientific achievements that have no analogues in the world are presented in the monograph

Anatoly Zatsepin and Dmitry Biryukov, associate professors of the Department of Physical Methods and Quality Control Devices, Ural Federal University, summarized long-term studies of the processes of direct and indirect optical excitation of spatially limited excitons in quantum dots. The results of the work are presented in the collective international monograph Quantum Dots. Fundamental and Applications ("Quantum dots. Basics and applications") British publishing house Intechopen Limited.

In the monograph, Ural Federal University scientists talked about a new author's approach, which allows analyzing the temperature dependences of photoluminescence of five different types. In addition, in the course of their research, they managed to formulate a model of the ongoing processes, thanks to which it is possible to estimate the energy and kinetic characteristics of the photoluminescence of quantum dots.

“Quantum dots are tiny particles of foreign matter. They consist of a limited number of atoms and are capable of drastically changing the optical and luminescent properties of the material into which they are embedded, explains Dmitry Biryukov. - Due to the nanoscopic magnitude, the optical and electronic properties of quantum dots are extremely sensitive to their size and shape. Even small changes in these parameters can affect a wide variety of functional characteristics of materials. "

From a practical point of view, this means that quantum dots can be used to create efficient light sources, lasers, optical radiation converters, energy converters, optical sensors, and many other elements of optoelectronics and photonics.

“Thanks to the studies carried out, we can determine, already by the shape of the temperature curves of luminescence, which mechanisms of excitation and relaxation occur in a substance with the participation of quantum dots. The results obtained in this study have no analogues in the world today, - Anatoly Zatsepin comments. - The 100th anniversary of UrFU is approaching, and for us publication in an international monograph is an assessment of our long-term scientific activity in the field of nanomaterials.

The scientists received the results as part of the research group "Photonics and Spectroscopy" of the scientific laboratory of the Physics and Technology Institute of the UrFU "Physics of functional materials of carbon micro- and optoelectronics". One of the priority directions of the laboratory's activity is the development of new materials with controlled optical properties.