A clear effect of charge compensation through Na+ co-doping on the luminescence spectra and decay kinetics of Nd3+ -doped CaAl4O7.
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Wrocławski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Journal of Solid State Chemistry
ISSN
0022-4596
EISSN
0022-4596
Wydawca
Elsevier
Rok publikacji
2016
Numer zeszytu
Strony od-do
259-266
Numer tomu
238
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 2)
Pozostali autorzy
+ 1
Autorzy przekładu
(liczba autorów przekładu: 0)
Słowa kluczowe
eng
Calcium aluminate
Enhanced Nd3+ luminescence
Charge compensation
Absorption spectra
Decay kinetics
Streszczenia
Język
eng
Treść
We present a detailed analysis of luminescence behavior of singly Nd3+U+0026amp;nbsp;doped and Nd3+, Na+U+0026amp;nbsp;co-doped calcium aluminates powders: Ca1U+0026amp;minus;xNdxAl4O7U+0026amp;nbsp;and Ca1U+0026amp;minus;2xNdxNaxAl4O7(x=0.001U+0026amp;ndash;0.1). Relatively intense Nd3+U+0026amp;nbsp;luminescence in IR region corresponding to typicalU+0026amp;nbsp;4F3/2U+0026amp;rarr;4IJU+0026amp;nbsp;(J=9/2U+0026amp;ndash;13/2) transitions with maximum located at about 1079U+0026amp;nbsp;nm was obtained in all samples on direct excitation into fU+0026amp;ndash;f levels. The effect of dopant concentration and charge compensation by co-doping with Na+U+0026amp;nbsp;ions on morphology and optical properties were studied. The results show that both, the Nd3+U+0026amp;nbsp;concentration and the alkali metal co-doping affected the optical properties but had no influence on the powders morphology. The studies of luminescence spectra (298 and 77U+0026amp;nbsp;K) in a function of dopant concentration showed an increasing distortion of the local symmetry of Nd3+with raising activator content due to certain defects created in the crystal lattice. On the other hand Na+U+0026amp;nbsp;addition led to significant narrowing of absorption and luminescence bands and also a reduction of the number of their components, showing smaller disturbance of Nd3+U+0026amp;nbsp;ions local symmetries. Consequently, charge compensated by Na+co-doping materials showed significantly enhanced Nd3+U+0026amp;nbsp;luminescence. The decrease of emission intensity and luminescence lifetimes with increase of activator concentration was attributed mainly to phonon-assisted cross-relaxation processes between Nd3+U+0026amp;nbsp;ions. Analysis with InokutiU+0026amp;ndash;Hirayama model indicated dipoleU+0026amp;ndash;dipole mechanism of ion-ion interaction. Na+U+0026amp;nbsp;addition led to much smaller concentration quenching due to smaller clustering of dopant ions in CaAl4O7U+0026amp;nbsp;lattice.
Cechy publikacji
original-article
Inne
System-identifier
2016CH7824
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