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Erratum published on 13 November 2015, see Materials 2015, 8(11), 7690.

Open AccessArticle
Materials 2015, 8(10), 6978-6998; doi:10.3390/ma8105348

Optical, Structural and Paramagnetic Properties of Eu-Doped Ternary Sulfides ALnS2 (A = Na, K, Rb; Ln = La, Gd, Lu, Y)

1
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 1999/2, Praha 8 18221, Czech Republic
2
Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, Praha 1 11519, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Jung Ho Je
Received: 7 August 2015 / Revised: 19 September 2015 / Accepted: 28 September 2015 / Published: 13 October 2015
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Eu-doped ternary sulfides of general formula ALnS2 (A = Na, K, Rb; Ln = La, Gd, Lu, Y) are presented as a novel interesting material family which may find usage as X-ray phosphors or solid state white light emitting diode (LED) lighting. Samples were synthesized in the form of transparent crystalline hexagonal platelets by chemical reaction under the flow of hydrogen sulfide. Their physical properties were investigated by means of X-ray diffraction, time-resolved photoluminescence spectroscopy, electron paramagnetic resonance, and X-ray excited fluorescence. Corresponding characteristics, including absorption, radioluminescence, photoluminescence excitation and emission spectra, and decay kinetics curves, were measured and evaluated in a broad temperature range (8–800 K). Calculations including quantum local crystal field potential and spin-Hamiltonian for a paramagnetic particle in D3d local symmetry and phenomenological model dealing with excited state dynamics were performed to explain the experimentally observed features. Based on the results, an energy diagram of lanthanide energy levels in KLuS2 is proposed. Color model xy-coordinates are used to compare effects of dopants on the resulting spectrum. The application potential of the mentioned compounds in the field of white LED solid state lighting or X-ray phosphors is thoroughly discussed. View Full-Text
Keywords: luminescence; white light emitting diode; Eu2+; ternary sulfide; EPR luminescence; white light emitting diode; Eu2+; ternary sulfide; EPR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jarý, V.; Havlák, L.; Bárta, J.; Buryi, M.; Mihóková, E.; Rejman, M.; Laguta, V.; Nikl, M. Optical, Structural and Paramagnetic Properties of Eu-Doped Ternary Sulfides ALnS2 (A = Na, K, Rb; Ln = La, Gd, Lu, Y). Materials 2015, 8, 6978-6998.

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