Spectral Characterization of Long-Lived Luminescence in h-BN Powder under UV Excitation | Sciact - CRIS-система Института катализа

Spectral Characterization of Long-Lived Luminescence in h-BN Powder under UV Excitation Научная публикация

Журнал

Journal of Alloys and Compounds
ISSN: 0925-8388 , E-ISSN: 1873-4669

Вых. Данные

Год: 2021, Том: 871, Номер статьи : 159471, Страниц : 8 DOI: 10.1016/j.jallcom.2021.159471

Ключевые слова

Hexagonal boron nitride; Oxygen and carbon impurities; Nitrogen vacancy; Photoluminescence; PL decay

Авторы

Weinstein I.A. ^1,2 , Spiridonov D.M. ¹ , Vokhmintsev A.S. ¹ , Saraev A.A. ³ , Henaish A.M.A. ^1,4

Организации

1	NANOTECH Center, Ural Federal University, Ekaterinburg 620002, Russia
2	Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620016, Russia
3	Boreskov Institute of Catalysis, pr. Akademika Lavrentieva, 5, Novosibirsk 630090, Russia
4	Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt

Информация о финансировании (1)

Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)

FEUZ-2020-0059

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.

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 CAPlusCA OpenAlex

Поступила в редакцию:	11 авг. 2020 г.
Принята к публикации:	7 мар. 2021 г.
Опубликована online:	12 мар. 2021 г.
Опубликована в печати:	1 авг. 2021 г.

Web of science:	WOS:000647776700006
Scopus:	2-s2.0-85103255972
РИНЦ:	46760154
Chemical Abstracts:	2021:740943
Chemical Abstracts (print):	175:108010
OpenAlex:	W3133687311

БД	Цитирований
Scopus	3
Web of science	2
РИНЦ	2
OpenAlex	3