Рубрики:
MODULATED STRUCTURE
LANTHANIDE
NANOCRYSTALS
PHOSPHORS
Кл.слова (ненормированные):
Fluoride crystals -- Erbium -- Ytterbium -- Up-conversion -- Luminescence -- Crystal structure -- Power dependence -- Pump wavelength dependence
MODULATED STRUCTURE
LANTHANIDE
NANOCRYSTALS
PHOSPHORS
Кл.слова (ненормированные):
Fluoride crystals -- Erbium -- Ytterbium -- Up-conversion -- Luminescence -- Crystal structure -- Power dependence -- Pump wavelength dependence
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 970-980 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. (C) 2016 Elsevier B.V. All rights reserved.
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Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
LV Kirenskii Inst Phys, Krasnoyarsk, Russia.
Far Eastern State Transport Univ, Khabarovsk, Russia.
Доп.точки доступа:
Ikonnikov, D. A.; Voronov, V. N.; Воронов, Владимир Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Russian Foundation for Basic Research [15-52-53080]; Russian President [SS-7612.2016.2, 0358-2015-0012, II.2P]