Abstract: Abstract CsLaSiS4 single crystals doped with Tb3+ and co-doped with Ce3+, Tb3+ ions were obtained by a high-temperature flux synthesis. XRD data demonstrate that the samples crystallize in the orthorhombic Pnma space group without additional reflections belonging to the impurity phases. Low-temperature luminescent spectroscopy methods have been used to study the efficiency of radiative transitions and energy transfer between Ce3+ and Tb3+ ions. Additionally, the effect of irradiation with protons with an energy of 18 MeV from a cyclotron was studied. Spectral-kinetic measurements of pulsed cathodo- and photoluminescence of samples co-doped with Ce3⁺ and Tb3⁺ revealed bidirectional energy transfer processes between these ions, the parameters of nonradiative energy transfer Ce3+ → Tb3+ were determined. The effect of concentration quenching is observed in undoped CsTbSiS4. The method of low-temperature thermally stimulated luminescence and the kinetics of pulsed cathodoluminescence indicate a high concentration of "shallow" carrier trapping centers in doped samples. When irradiating CsLaSiS4:0.5%Ce sample with protons, both the low-temperature emission of self-trapped excitons (STE) and the energy transfer STE → Ce3+ decrease, the luminescence yield of defect-bound excitons (DBE) also decreases compared to the emission of Ce3+ ions, and defects are mainly formed, which are the centers of nonradiative recombination of band charge carriers.

Cite: Pustovarov V.A. , Tavrunov D.A. , Savinov E.O. , Sarychev M.N. , Sapov A.A. , Tarasenko M.S.
Luminescence and energy transfer in CsLaSiS4 single crystals doped with Tb3+ and Ce3+ ions
Optical Materials. 2025. V.158. 116484 :1-7. DOI: 10.1016/j.optmat.2024.116484 WOS Scopus OpenAlex

Dates:

Submitted:	Sep 27, 2024
Accepted:	Nov 21, 2024
Published online:	Nov 22, 2024
Published print:	Jan 30, 2025

Identifiers:

Web of science:	WOS:001370130300001
Scopus:	2-s2.0-85210124811
OpenAlex:	W4404635042

Citing: Пока нет цитирований

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