Abstract
The structure and optical properties of Srn+1SnnO3n+1 ceramics greatly depend on the n value. Thus, we fabricated four compositions, namely Srn+1SnnO3n+1:Eu3+ (n = 1, 2, 5, ∞) ceramics, and their crystal structure, photoluminescence, photochromism and luminesce modulation properties have been investigated. It is found that excellent photochromism and luminesce modulation properties are found in Sr2SnO4:Eu3+ and Sr3Sn2O7:Eu3+ ceramics. After 280-nm light irradiation, the Sr2SnO4:Eu3+ ceramics transform into gray purple from primal white. Meanwhile, luminescence intensity decrement ratio ΔIdec of the colored Sr2SnO4:Eu3+ reaches a high value of 80.8% under optimized irradiation wavelength. The decreased luminescence intensity of Eu3+ can be completely recovered via 450-nm light irradiation. The ΔIdec of Sr3Sn2O7:Eu3+ ceramic reaches 53.1%, and the decreased luminesce intensity can not be covered by light irradiation, only can be covered by a high temperature stimulus at 400 °C. Finally, we successfully fabricated a flexible membrane using Sr2SnO4:Eu3+ and PDMS for anti-counterfeiting applications.
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