SrAl12O19: Mn phosphor prepared by the polymeric precursor method: a soft chemical route to reduce temperature synthesis for optical thermometry application.
CHAIM, Thiago Ardana; BERNARDI, Maria Inês Basso; OTUKA, Adriano Jose Galvani; VICENTE, Fabio Simões de; MESQUITA, Alexandre.
CHAIM, Thiago Ardana; BERNARDI, Maria Inês Basso; OTUKA, Adriano Jose Galvani; VICENTE, Fabio Simões de; MESQUITA, Alexandre.
Abstract: Phosphor materials have attracted attention for their potential use in technological application such as optical thermometry, a non-contact temperature sensing technique which is based on the temperature-dependent luminescent properties of these materials. In many cases, these attractive properties are due to the incorporation of rare-earth elements into crystalline lattices, although their preparation is often toxic, costly and scarce. Thus, this study reports on the synthesis and characterization of manganese-doped strontium aluminate (SrAl12O19:Mn4 +), a rare-earth free phosphor for optical thermometry applications. As this magnetoplumbite host matrix typically requires high synthesis temperatures (= 1300 °C) to stabilize, a soft chemical route based on the polymeric precursor method was implemented to reduce the preparation temperature. Combining annealing under N2 atmosphere and applying very fast heating rate, crystallization temperature of the pure magnetoplumbite phase was successfully reduced by approximately 300 °C. The single-phase structure stabilizes at 1000 °C, a temperature notably lower than that required by solid-state reactions or conventional sol-gel methods. Structural characterization via X-ray diffraction (XRD) confirmed the formation of the hexagonal phase, whereas photoluminescence spectroscopy revealed the characteristic red emission of Mn4+ ions attributed to the 2E ? 4A2 transition. Thus, Mn4+ ions effectively substituted Al3+ sites in the host lattice, resulting in strong red emission centered at 657 nm with high color purity. Temperature-dependent fluorescence measurements were performed and fluorescence intensity ratio (FIR) analysis indicated that the synthesized phosphors exhibit high thermal sensitivity (Sr-max = 4.41%K-1), comparable to rare-earth-doped materials and making the SrAl12O19:Mn4+ phosphor a promising and cost-effective candidate for non-contact optical thermometry.
@article={003294480,author = {CHAIM, Thiago Ardana; BERNARDI, Maria Inês Basso; OTUKA, Adriano Jose Galvani; VICENTE, Fabio Simões de; MESQUITA, Alexandre.},title={SrAl12O19: Mn phosphor prepared by the polymeric precursor method: a soft chemical route to reduce temperature synthesis for optical thermometry application},journal={Journal of Alloys and Compounds},note={v. 1060, p. 187207-1-187207-12 + supplementary material},year={2026}}