Spectral characterization of long-lived luminescence in h-BN powder under UV excitation

•Submicrosized h-BN powder with mesographitic structure has been studied.•Photoluminescence regularities have been investigated in millisecond time window.•Two-exponential decay kinetics of 335 and 415 nm emissions have been analyzed.•Recombination mechanisms with participating ON and CN centers hav...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-08, Vol.871, p.159471, Article 159471
Main Authors: Weinstein, I.A., Spiridonov, D.M., Vokhmintsev, A.S., Saraev, A.A., Henaish, A.M.A.
Format: Article
Language:English
Subjects:
Boron nitride
Complex systems
Delay time analysis
Emission analysis
Emission spectra
Energy gap
Excitation
Excitation spectra
Heterostructures
Hexagonal boron nitride
Impurities
Light sources
Luminescence
Nitrogen vacancy
Optoelectronics
Oxygen and carbon impurities
Photoluminescence
PL decay
Time constant
Windows (intervals)
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Summary:•Submicrosized h-BN powder with mesographitic structure has been studied.•Photoluminescence regularities have been investigated in millisecond time window.•Two-exponential decay kinetics of 335 and 415 nm emissions have been analyzed.•Recombination mechanisms with participating ON and CN centers have been discussed. 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
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.159471