Up-conversion luminescence in GaSe nanocrystals

SYRBU, N. N.; STAMOV, I. G.; DOROGAN, A. V.; ZALAMAI, V. V.

dc.contributor.author	SYRBU, N. N.
dc.contributor.author	STAMOV, I. G.
dc.contributor.author	DOROGAN, A. V.
dc.contributor.author	ZALAMAI, V. V.
dc.date.accessioned	2021-01-11T11:38:09Z
dc.date.available	2021-01-11T11:38:09Z
dc.date.issued	2021
dc.identifier.citation	SYRBU, N. N., STAMOV, I. G., DOROGAN, A. V. et al. Up-conversion luminescence in GaSe nanocrystals. In: Optical Materials, 2021, V. 111, pp. 110675. ISSN 0925-3467.	en_US
dc.identifier.uri	https://doi.org/10.1016/j.optmat.2020.110675
dc.identifier.uri	http://repository.utm.md/handle/5014/12400
dc.description	Access full text – https://doi.org/10.1016/j.optmat.2020.110675	en_US
dc.description.abstract	Optical properties of GaSe crystals have been investigated at wide temperature range from 10 to 300 K by help of reflection, absorption, and wavelength modulated reflection, and transmission spectra. Received data were compared with measured photoluminescence spectra. Three excitonic series were found out. The parameters of excitonic serie for С1-V1 bnads were determined. The longitudinal-transversal splitting of excitonic polariton ground states were determined. The doublet character of the transversal excitonic polariton mode (ωТ) was found out. The ground (n = 1) and excited (n = 2,3 … Eg) states of two high-energy excitonic series caused by C2–V1 and С3-V1 bands had been recognized, and its parameters were determined. The up-conversion of luminescence from high-energy excitonic levels (Е > 3 eV) was studied. The electrons were excited from V1 (Г1) to C1 (Г6) and C2 (Г5) bands with further transitions to higher energy levels С3-С6. So the luminescence from the excitonic levels of C3-С6 bands towards valence bands takes place. The band model in the Brillouin zone centerwas constructed based on the obtained data.	en_US
dc.language.iso	en	en_US
dc.publisher	Elservier	en_US
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 United States	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.subject	gallium selenide	en_US
dc.subject	up-conversion processes	en_US
dc.subject	luminescence	en_US
dc.subject	excitionic states	en_US
dc.subject	optical spectroscopy	en_US
dc.subject	nanocrystals	en_US
dc.subject	crystals	en_US
dc.title	Up-conversion luminescence in GaSe nanocrystals	en_US
dc.type	Article	en_US