Greenish white emission of ZnO microwalls fabricated by a hot target magnetron sputtering method

A. P. Tarasov^a, A. M. Ismailov^b, A. È. Muslimov<sup>a

a</sup> Institute of Cristallography Russian Academy of Sciences, Moscow, Russia
^b Daghestan State University, Makhachkala, Dagestan Republic, Russia

Abstract: The processes of formation of two-dimensional ZnO microstructures were studied for the first time using the hot magnetron sputtering regime. The fabricated microstructures had a morphology of multilayer walls 1–2 $\mu$m thick and were characterized by the presence of pores up to 10 $\mu$m in size. The UV-vis and photoluminescence spectroscopy methods revealed a significant modification of the optical properties of structures as a result of heat treatment. In particular, postgrowth annealing resulted in a significant enhancement of the narrow UV near-band-edge emission band, as well as the appearance of strong visible luminescence. A sufficiently long wavelength position ($\sim$ 545 nm) and a large width (FWHM $\sim$ 140 nm) of the visible luminescence band cause the visually observed bright greenish white emission.

Keywords: zinc oxide, hot target, magnetron sputtering, 2D structures, microwalls, white luminescence, white light source.

Received: 15.08.2023
Revised: 09.09.2023
Accepted: 13.09.2023

DOI: 10.61011/PJTF.2023.22.56590.19707

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