Инд. авторы:	Omelkov S.I., Kirm M., Feldbach E., Pustovarov V.A., Cholakh S.O., Isaenko L.I.
Заглавие:	Luminescence properties of undoped LiBaAlF6 single crystals
Библ. ссылка:	Omelkov S.I., Kirm M., Feldbach E., Pustovarov V.A., Cholakh S.O., Isaenko L.I. Luminescence properties of undoped LiBaAlF6 single crystals // Journal of Physics: Condensed Matter. - 2010. - Vol.22. - Iss. 29. - Art.295504. - ISSN 0953-8984. - EISSN 1361-648X.
Внешние системы:	DOI: 10.1088/0953-8984/22/29/295504; РИНЦ: 17834119; SCOPUS: 2-s2.0-77954345980;
Реферат:	eng: This paper presents the results of the study of electronic excitations in undoped LiBaAlF6 single crystals by means of luminescence spectroscopy and complimentary optical methods. The intrinsic emission at 4.2eV due to self-trapped excitons was identified. The fast nanosecond defect-related luminescence was revealed at 3.0eV. Both emissions degrade under electron beam irradiation, the most probable reason of which is defect creation introducing an additional non-radiative relaxation channel prohibiting energy transfer to luminescence centers. These defects can be recovered and luminescence intensity restored at higher temperatures (>200K). The permanent damage by electron beam irradiation results only in overall growth of the absorption coefficient in the whole 1.5-6.5eV spectral region studied. The analysis of thermally stimulated luminescence glow curves in the temperature range of 5-410K revealed two shallow charge carrier traps with the activation energies of 0.22 and 0.33eV, respectively. The luminescence of an impurity peaked at 2.5eV was found and tentatively assigned to an oxygen-related emission center. © 2010 IOP Publishing Ltd.
Ключевые слова:	Defect creation; Electron beam irradiation; Electronic excitation; Emission centers; Glow curve; Higher temperatures; Intrinsic emission; Luminescence centers; Luminescence intensity; Single crystals; Spectroscopy; Oxygen; Luminescence; Irradiation; Excitons; Absorption coefficients; Electron beams; Defects; Crystal impurities; Activation energy; Activation analysis; Thermally stimulated luminescence; Temperature range; Spectral region; Self-trapped exciton; Permanent damage; Optical methods; Non-radiative relaxation; Luminescence spectroscopy; Luminescence properties; Energy transfer;
Издано:	2010
Физ. характеристика:	295504