Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder

Leonid Fedorenko
* ,
Volodymyr Litovchenko
,
Vadym Naumov
ORCID logo ,
Dmytro Korbutyak
,
Volodymyr Yukhymchuk
,
Olexander Gudymenko
,
Olexander Dubikovskyi
,
Hidenori Mimura
,
Arturs Medvids
Version 1 : Received: 29 August 2022 / Approved: 30 August 2022 / Online: 30 August 2022 (10:45:02 CEST)

A peer-reviewed article of this Preprint also exists.

Fedorenko, L.; Litovchenko, V.; Naumov, V.; Korbutyak, D.; Yukhymchuk, V.; Gudymenko, O.; Dubikovskyi, O.; Mimura, H.; Medvids, A. Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder. Coatings 2022, 12, 1705. Fedorenko, L.; Litovchenko, V.; Naumov, V.; Korbutyak, D.; Yukhymchuk, V.; Gudymenko, O.; Dubikovskyi, O.; Mimura, H.; Medvids, A. Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder. Coatings 2022, 12, 1705.

Abstract

A comparative analysis of the features of UV- stimulated emission (SE) of various types of disorder active materials based on ZnO crystallites for a random laser (RL) was carried out. The superlinear increase in the intensity of the UV photoluminescence (PL) band of polydisperse nano- microcrystalline (PNMC) ZnO powder at a wavelength of λ = 387 nm and some narrowing of its half-width in the range of 20-15 nm with increasing pump intensity indicate random lasing with incoherent feedback (FB). Properties of similar UV PL bands under the same conditions from a thin film containing hexagonal ZnO microdisks, as well as samples of monodisperse ZnO nanopowder indicate stimulated emission with coherent feedback. It is shown that, among the studied materials, the PNMC ZnO powder with crystallites contained nano-grains with is the most suitable for creating a laser with incoherent feedback at room temperature. The dominant factor of UV SE in PNMC ZnO powder is radiation transitions under exciton - exciton scattering conditions. The possible mechanisms of this random emission with the continuous spectrum are discussed. The average optical gain coefficient αg at λ = 387 nm in this RL system is estimated, as αg ~ 150 cm-1.

Keywords

ZnO crystallite; random laser; excitons; stimulated emission; polydisperse powder; thin film; hexagonal microdisks; monodisperse nano-powder; nanophotonics

Subject

Physical Sciences, Applied Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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