Research team develops a theory to improve the energy efficiency of electronic devices

Research team develops a theory to improve the energy efficiency of electronic devices
Computational screening of heptazine analogues. a) Schematic diagram of singlet and triplet excited states split in energy by the exchange interaction (middle) and then inverted by including the double-excitation effect (right). b) Molecular structures of the heptazine analogues examined in the computational screening. c) Number of screened molecules as a function of ΔEST and f calculated by TDDFT. d) S1–S0 energy gaps as a function of ΔEST and f calculated by TDDFT. Credit: Nature (2022). DOI: 10.1038/s41586-022-05132-y

The University of Alicante Quantum Chemistry group has predicted and published the existence of a new natural phenomenon in matter-radiation interaction, which has recently been experimentally confirmed. This finding is the subject of the review that the group's researcher Juan Carlos Sancho García has submitted to the journal Nature, having been invited to publish in its "News & Views" section.

According to Sancho, his contribution is a successful example of how theory and simulation make it possible to advance and predict phenomena that are later confirmed by experiments, with the corresponding possible impact on the technological advances that populate society and the world today. In particular, the review reports the empirical confirmation of a prediction previously made and published by the UA team using quantum mechanics calculations. This is based on the effect of the "electronic correlation" that occurs strongly in this type of molecules studied, by which it is possible to take advantage of 100% of the energy that is emitted in the form of visible light on any screen.

The researcher explains that each of the pixels of a screen that makes up any device such as mobile phones, tablets, etc. is made up of molecules that emit the three basic colors (red, green, and blue). The battery activates these molecules to emit light () so that they first reach their maximum level of "excitation" and then decay, and it is this loss of energy that results in the emission of color.

At present, an inefficient mechanism is used with 75% of the energy getting lost in each emission of light, so that only the remaining 25% is used. The researchers predicted a use of 100% of the energy through their research, as the chemist explained. He also pointed out that they could make significant energy savings worldwide with its application. This lower expenditure would also allow for a reduction in and, consequently, in , which would help achieve the Sustainable Development Goals set by the United Nations.

Currently, there is no device on the market that is applying this newly discovered phenomenon, but the UA researchers are confident of seeing it in a short period of time.

More information: Naoya Aizawa et al, Delayed fluorescence from inverted singlet and triplet excited states, Nature (2022). DOI: 10.1038/s41586-022-05132-y

Juan-Carlos Sancho-García, Fluorescence limitations overcome by engineering light–matter interactions, Nature (2022). DOI: 10.1038/d41586-022-02890-7

Journal information: Nature

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Citation: Research team develops a theory to improve the energy efficiency of electronic devices (2022, October 13) retrieved 7 February 2023 from
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