Luminescent properties of a ZnO whisker array as a scintillation detector material

Тарасов, А. П.; Venevtsev, Ivan; Муслимов, А. Э.; Zadorozhnaya, L. A.; Родный, П. А.; Kanevsky, V. M.

doi:10.1070/qel17534

Cited by 8 publications

(10 citation statements)

References 37 publications

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“…The emission of the sample was collimated to the entrance slit of a monochromator coupled to a Peltier-cooled charge-coupled device camera. More details about our PL and XRL measurements can be found elsewhere [30,31].…”

Section: Methodsmentioning

confidence: 99%

“…At the same time, each type of morphology has its own advantages and disadvantages in terms of scintillation applications. In particular, intense NBEL under X-ray excitation is observed only in ZnO samples of high crystalline quality, such as bulk crystals [27,28], 1D and 2D nano-and microcrystals [28][29][30][31], or doped ZnO ceramics [32][33][34]. A disadvantage of bulk crystals in this sense is the presence of a slow component in the visible range of the luminescence spectrum, along with the fast NBEL component [27,35].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Plasma Treatment on the Luminescent and Scintillation Properties of Thick ZnO Films Fabricated by Sputtering of a Hot Ceramic Target

Tarasov,

Ismailov,

Gadzhiev

et al. 2023

Photonics

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The paper presents the results of a comprehensive study of the structural-phase composition, morphology, optical, luminescent, and scintillation characteristics of thick ZnO films fabricated by magnetron sputtering. By using a hot ceramic target, extremely rapid growth (~50 µm/h) of ZnO microfilms more than 100 µm thick was performed, which is an advantage for the industrial production of scintillation detectors. The effects of post-growth treatment of the fabricated films in low-temperature plasma were studied and a significant improvement in their crystalline and optical quality was shown. As a result, the films exhibit intense near-band-edge luminescence in the near-UV region with a decay time of <1 ns. Plasma treatment also allowed to significantly weaken the visible defect luminescence excited in the near-surface regions of the films. A study of the luminescence mechanisms in the synthesized films revealed that their near-band-edge emission at room temperature is formed by phonon replicas of free exciton recombination emission. Particularly, the first phonon replica plays the main role in the case of optical excitation, while upon X-ray excitation, the second phonon replica dominates. It was also shown that the green band peaking at ~510 nm (2.43 eV) is due to surface emission centers, while longer wavelength (>550 nm) green-yellow emission originates mainly from bulk parts of the films.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Plasma Treatment on the Luminescent and Scintillation Properties of Thick ZnO Films Fabricated by Sputtering of a Hot Ceramic Target

Tarasov,

Ismailov,

Gadzhiev

et al. 2023

Photonics

View full text Add to dashboard Cite

show abstract

“…Evaluation of the density of electron-hole pairs generated by the photoexcitation, taking into account their diffusion [20,22,23], yields values not exceeding 10 17 cm −3 by the order of magnitude, i. e. not greater than the Mott threshold density for ZnO, which is in the range of 5 • 10 17 −4 • 10 19 cm −3 according to different sources [23][24][25].…”

Section: X-ray and Photoluminescent Properties Of Samplesmentioning

confidence: 96%

“…3 and comments above). This makes the microfilms different from the case of ZnO structures with nanoscale or submicron crystallites, where the portion of material volume participating in both PL and XRL can be rather high, and, hence, PL and XRL spectra can be similar to each other [7,20].…”

Section: X-ray and Photoluminescent Properties Of Samplesmentioning

confidence: 98%

“…Since the annealing resulted in increased luminescence of films, and in general, samples, especially the M-type film, demonstrate good scintillation properties, in particular, fast XRL decay, studying of their PL-properties was of interest as well. Comparison of PL and XRL spectra contribute to the interpretation of the radiation nature, in particular, the radiation resulted from the X-ray excitation [20].…”

Section: X-ray and Photoluminescent Properties Of Samplesmentioning

confidence: 99%

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X-ray Luminescent Properties of Zinc Oxide Films on the Sapphire M and A-Plane

Venevtsev

Муслимов

Тарасов

et al. 2022

Optics and Spectroscopy

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The results of comparative studies of the processes of high-temperature synthesis, luminescence and scintillation characteristics of ZnO films on M(100)- and A(110)-orientation sapphire substrates are presented. It is shown that the use of the magnetron deposition method makes it possible to form, against the background of a continuous film, ensembles of individual [001] ZnO microcrystals with pronounced X-ray luminescent properties. The X-ray luminescence kinetics is characterized by two components: a fast component with a decay time in the order of a nanosecond and a slow luminescence component. The study of the films by photoluminescence spectroscopy revealed the features of the near-band-edge luminescence spectra of the samples, in particular, the presence of various excitonic emission channels. Differences in the spectral parameters of the near-band-edge luminescence band in the case of optical and X-ray excitation are found and interpreted. Keywords: Films, microcrystals, zinc oxide, X-ray luminescence, photoluminescence, excitonic emission.

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Origin of Optical Gain in Narrow ZnO Microrods with Whispering Gallery Modes

Tarasov,

Zadorozhnaya,

Kanevsky

2024

Jetp Lett.

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Due to sufficiently high lasing thresholds, stimulated emission in relatively small ZnO microcrystal lasers is often considered to be fed by an inverted electron–hole plasma (EHP). In this study, the nature of optical gain in such emitters is investigated using ZnO microrods 1–6 µm in diameter synthesized by a modified thermal evaporation method and exhibiting whispering-gallery mode (WGM) lasing in the near ultraviolet range. It is demonstrated that optical gain in these objects is not a consequence of population inversion of the EHP at either low or room temperatures. Instead, the primary gain mechanism is the process of scattering of electron–hole pairs by free electrons. Unlike the case of large ZnO WGM microcavities, in small-diameter microrods this process turns out to be dominant over a wide temperature range.

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Luminescent properties of a ZnO whisker array as a scintillation detector material

Cited by 8 publications

References 37 publications

Effect of Plasma Treatment on the Luminescent and Scintillation Properties of Thick ZnO Films Fabricated by Sputtering of a Hot Ceramic Target

Effect of Plasma Treatment on the Luminescent and Scintillation Properties of Thick ZnO Films Fabricated by Sputtering of a Hot Ceramic Target

X-ray Luminescent Properties of Zinc Oxide Films on the Sapphire M and A-Plane

Origin of Optical Gain in Narrow ZnO Microrods with Whispering Gallery Modes

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