Abstract
In this work, we developed Ln3+(Eu3+/Tb3+)-hybridized fluorescent sands with self-cleaning properties for outdoor photonic indicators (OPIs). To introduce Ln3+(Eu3+/Tb3+)-induced fluorescence sand-surfaces with superhydrophobic properties, Ln3+ complexes (EuC/TbC) were anchored to sand@SiO2 particulates for the formation of sand@SiO2@LnC@PFDS. The emission spectra were measured at 365/345 nm for sand@SiO2@EuC@PFDS and sand@SiO2@TbC@PFDS. Sand@SiO2@LnC@PFDS indicated highly bright red and green emission with a long fluorescence lifetime. CIE color data were used to evaluate the high color purity of the red/green emissions under ultraviolet excitation light. More importantly, fluorescent sand particulates with self-cleaning properties can prevent intense photonic signals from being polluted by dust, ice, humidity, and rainwater which can be applied to construct signaling indicators for emergency rescue work and natural disaster sites.
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