Preparation, luminescence properties, and application of temperature sensing and anti-counterfeiting of La2MgTiO6:Yb3+/Ln3+/Mn4+

The doping of transition metal ions in the up-conversion (UC) luminescent material doped with Yb3+/Ln(3+) is a facile way to increase their UC luminescence intensities and alter their colors. In this study, La2MgTiO6:Yb3+/Mn4+/Ln(3+) (Ln(3+ )= Er3+, Ho3+, and Tm3+) phosphors showing excellent luminescence properties were prepared by a solid-state method. The sensitivity of the La2MgTiO6:Yb3+/Ln(3+)/Mn4+ phosphor was double that without Mn4+, because Mn4+ affects the UC emissions of Ln(3+) via energy transfer between these ions. Moreover, Mn4+ also acts as a down-conversion activator, which can combine with UC ions to achieve multi-mode luminescence at different wavelengths. Under 980 nm excitation, these samples emit green light (from Er3+ and Ho3+) and blue light (from Tm3+). In contrast, under 365 nm excitation, they emit red light (from Mn4+). Further testing revealed that the La2MgTiO6:Yb3+/Mn4+/Ln(3+) phosphors have potential applications in temperature sensing and anti-counterfeiting.

Automated summary

Doping transition metal ions in the up-conversion (UC) luminescent material can enhance the luminescence intensities and alter the colors. La2MgTiO6:Yb3+/Mn4+/Ln(3+) phosphors prepared in this study showed excellent luminescence properties and have potential applications in temperature sensing and anti-counterfeiting.