Title Dynamic and multimodal luminescence of Mn2+-doped Mg4Ga8Ge2O20 persistent phosphor for anti-counterfeiting applications
Authors Doke, Guna ; Radionovs, Pavels ; Antuzevics, Andris ; Cirulis, Jekabs ; Krieke, Guna ; Kemere, Meldra ; Beganskienė, Aldona ; Žarkov, Aleksej
DOI 10.1039/D5TC00875A
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Is Part of Journal of materials chemistry C.. Cambridge : The Royal Society of Chemistry. 2025, vol. 13, iss. 21, p. 10871-10881.. ISSN 2050-7526. eISSN 2050-7534
Keywords [eng] persistent luminescence ; anti-counterfeiting ; multimodal luminescence
Abstract [eng] The study provides an in-depth analysis of the structure and luminescence properties of Mg4Ga8Ge2O20:Mn2+ (MGGO) materials, focusing particularly on their dynamic color-changing capabilities. A series of single-phase MGGO:xMn2+ (0.0 ≤ x ≤ 0.5 mol%) was prepared. The successful incorporation of Mn2+ ions was verified using electron paramagnetic resonance spectroscopy. The photoluminescence and X-ray excited optical luminescence properties demonstrated that emission can be color-tuned based on the concentration of Mn2+ ions, with significant color shifts between red and blue observed during excitation and decaying of persistent luminescence. The persistent luminescence properties were characterized and analyzed, revealing complex decay behaviors that suggest a combination of tunneling and thermal detrapping mechanisms. Three types of traps were identified in the MGGO materials: shallow traps associated with intrinsic defect emission, deep traps, and Ga-related hole traps linked to Mn2+ emission. Notably, all MGGO samples can be characterized by red thermally stimulated luminescence, regardless of the initial luminescence color. These findings indicate that MGGO materials hold significant potential for anti-counterfeiting applications due to their dynamic and multimodal luminescent properties.
Published Cambridge : The Royal Society of Chemistry
Type Journal article
Language English
Publication date 2025
CC license CC license description