Herein, single monoclinic phase Mn-doped SrInTaO (SITO) phosphors were reported in terms of both luminescence behaviors and potential applications. The optimal Mn-doped SITO (0.3 mol%) exhibited a good color purity of 92.9% in a deep-red region with a chromaticity coordinate of (0.707, 0.293). In addition, the local structure of Mn in the SITO matrix was determined. The crystal-field strength was calculated to be approximately 1781.7 cm whereas the nephelauxetic ratio was determined to be 1.04. Furthermore, the flexible SITO:Mn-YAG:Ce security film was fabricated for use in anti-counterfeiting applications, which could emit different colors under various lighting sources. The SITO:Mn phosphors exhibited a high sensing sensitivity based on the luminescence lifetime. Consequently, the SITO:Mn phosphors can be employed in bifunctional platforms of luminescence lifetime thermometry and anti-counterfeiting applications.
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