Optical Absorption and Luminescence of Gd3Ga5O12:Cr,Mg Epitaxial Films
Ya. Zakharkoa, I.I. Syvorotkab, A. Luchechkoa, I.M. Syvorotkab, D. Sugakb,c and M. Vakivb
a Faculty of Electronics, Ivan Franko National University of Lviv, 107 Tarnavskogo St., Lviv 79017, Ukraine
b Institute for Materials, SRC "Carat", 202 Stryjska St., Lviv 79031, Ukraine
c Lviv Polytechnic National University, 12 Bandera St., 79646 Lviv, Ukraine
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The optical absorption, emission spectra and luminescence decay kinetics under photoexcitation of Gd3Ga5O12 (GGG) garnet epitaxial films doped with Cr3+ ions and co-doped with Cr3+ and Mg2+ ions have been investigated. Luminescence of the GGG:Cr films due to 4T24A2 and 2E → 4A2 transitions in Cr3+ ions have been observed. Increase of the activator ions concentration has an influence on the intensity and decay time of Cr3+ ions photoluminescence. Introduction of the magnesium ions leads to partial transformation of chromium valence state (Cr3+ → Cr4+) and to the appearance of a broad absorption band with the maximum at 860 nm. The narrow lines with luminescence maxima at 704 and 706 nm have arisen in the highly doped GGG:Cr,Mg films.
DOI: 10.12693/APhysPolA.117.111
PACS numbers: 61.72.sd, 78.20.-e, 78.55.Hx