Spectral Characterization of Long-Lived Luminescence in h-BN Powder under UV Excitation Full article
| Journal |
Journal of Alloys and Compounds
ISSN: 0925-8388 , E-ISSN: 1873-4669 |
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| Output data | Year: 2021, Volume: 871, Article number : 159471, Pages count : 8 DOI: 10.1016/j.jallcom.2021.159471 | ||||||||
| Tags | Hexagonal boron nitride; Oxygen and carbon impurities; Nitrogen vacancy; Photoluminescence; PL decay | ||||||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | FEUZ-2020-0059 |
Abstract:
Long-lasting luminescence in excited solid-state composites is of considerable interest as an inner light source for perspective materials capable to generate self-induced photoactivity after external irradiation turn-off. The corresponding slow ultraviolet (UV) and visible (Vis) emissions in hexagonal boron nitride can be caused by technology induced impurities (oxygen, carbon etc.) which form the complex system of electron and/or hole capturing levels within the energy gap. As result the created charge traps substantially influence on functional properties and optoelectronic characteristics of developed heterostructures based on h-BN. In this paper we study the photoluminescence (PL) peculiarities of nanostructured crystalline h-BN powder with C and O content< 0.5 wt% in the range of 200–600 nm in millisecond time window. The spectral and kinetic regularities of observed PL excitation and emission spectra have been quantitatively analyzed. Using delay time variation from 0.05 to 25 ms it has been demonstrated more than 2 times increase of Vis/UV luminescence intensities ratio under band-to-band excitation. This behavior is confirmed by two-exponential decay kinetics with τ2 = 1.5 – 10.6 ms time constant for a slow emission component in the powder studied. The observable luminescence is established to be due to recombination processes involving impurity ON and CN centers, as well as nitrogen VN vacancies and related complexes.
Cite:
Weinstein I.A.
, Spiridonov D.M.
, Vokhmintsev A.S.
, Saraev A.A.
, Henaish A.M.A.
Spectral Characterization of Long-Lived Luminescence in h-BN Powder under UV Excitation
Journal of Alloys and Compounds. 2021. V.871. 159471 :1-8. DOI: 10.1016/j.jallcom.2021.159471 WOS Scopus РИНЦ ANCAN OpenAlex
Spectral Characterization of Long-Lived Luminescence in h-BN Powder under UV Excitation
Journal of Alloys and Compounds. 2021. V.871. 159471 :1-8. DOI: 10.1016/j.jallcom.2021.159471 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Aug 11, 2020 |
| Accepted: | Mar 7, 2021 |
| Published online: | Mar 12, 2021 |
| Published print: | Aug 1, 2021 |
Identifiers:
| Web of science: | WOS:000647776700006 |
| Scopus: | 2-s2.0-85103255972 |
| Elibrary: | 46760154 |
| Chemical Abstracts: | 2021:740943 |
| Chemical Abstracts (print): | 175:108010 |
| OpenAlex: | W3133687311 |