Synthesis and luminescent properties of (RE0.95Ln0.05)2O2S (RE = La, Y; Ln = Ho, Tm)

• Published in: Journal of solid state chemistry 2021-01, Vol.293, p.121753, Article 121753
• Main Authors: Sal'nikova, E.I., Denisenko, Yu.G., Kolesnikov, I.E., Lähderanta, E., Andreev, O.V., Azarapin, N.O., Basova, S.A., Gubin, A.A., Oreshonkov, A.S.
• Format: Article
• Language: English
• Subjects: Lifetime; Luminescence; Quantum yield; Rare earth oxysulfides; Rietveld; Synthesis
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2020.121753

Solid solutions of oxysulfides (RE0.95Ln0.05)2O2S (RE = La, Y; Ln = Ho, Tm) were obtained by hydrogen reduction of the co-precipitated sulfates followed by sulfidation of the reaction products. The crystal chemical characteristics of the obtained compounds were refined by the Rietveld method. Morphological certification of particles in the dynamics of synthesis was performed. Most of the particles produced by chemical reactions have a cut that indicates the formation of a compound with a hexagonal syngony with angles of 60 and 120°. This indicates that the thermal effect of gaseous reagents H2, H2S on sulfates leads to heterogeneous reactions of thermal dissociation and the formation of new phases. Steady state luminescence properties displayed characteristic sharp bands corresponding to 4f-4f transitions. Luminescence decay curves of all studied samples showed monoexponential decay with microsecond and hundreds microsecond lifetimes depending on doping ions. Calculated color coordinates of Ho3+ and Tm3+-doped powders make them promising candidates to be used as phosphors. [Display omitted] •RE2O2S:Ln3+ (RE = La, Y) obtained of sulfates of REE in a stream of H2, H2S.•The quantum yield of the La2O2S:Ho3+ - 12%.•The quantum yield of the La2O2S:Ho3+ sample is 12%.