Upconversion luminescence of CsScF4 crystals doped with erbium and ytterbium
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http://elib.sfu-kras.ru/handle/2311/33184Дата:
2016-10Журнал:
Optical MaterialsКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q2Библиографическое описание:
Ikonnikov, D. A. Upconversion luminescence of CsScF4 crystals doped with erbium and ytterbium [Текст] / D. A. Ikonnikov, V. N. Voronov, M. S. Molokeev, А. С. Александровский // Optical Materials. — 2016. — Т. 60. — С. 594-589Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Аннотация:
Tetragonal CsScF4 crystals doped with (5 at.%) Er and Er/Yb (0.5 at.%/5 at.%) are grown and their crystal
structure is determined to belong to Pmmn space group. Er and Yb ions are shown to occupy distorted
octahedral Sc sites with the center of inversion. Bright visible upconversion luminescence was observed
under 970e980 nm pumping with red (4F9/2), yellow (4S3/2) and green (2H11/2) bands of comparable
intensity. UCL tuning curves maximize at 972 nm (CSF:Er) and at 969.7 nm (CSF:Er,Yb) pumping
wavelengths. Different ratios between yellow-green and red luminescence intensities in CSF:Er and
CSF:Er, Yb are explained by contribution of cross-relaxation in CSF:Er UCL. UC in CSF:Er is a three stage
process while UC in CSF:Er, Yb is a two stage process. The peculiarities of power dependences are
explained by the power-dependent repopulation between starting levels of UC.