Investigation of Persistent Luminescence of Strontium Aluminate in Polymer Films for Passive Daytime Radiative Cooling Application

This research-backed project guidance framework explores the synthesis and integration of persistent luminescent strontium aluminate ($SrAl_2O_4:Eu^{2+}, Dy^{3+}$) phosphors into various polymer matrices to evaluate passive daytime radiative cooling capabilities. The synthesis of the phosphors is structured around a combustion method, with co-doping strategies using lanthanum or terbium to modify the resulting afterglow characteristics. The prepared phosphors are subsequently embedded into polymer hosts such as epoxy resin, polymethyl methacrylate, polyvinyl alcohol, polyvinylpyrrolidone, and polydimethylsiloxane. Characterization protocols focus on analyzing photoluminescence emission spectra, luminance decay, and mid-infrared emissivity within the 8–14 $mu m$ atmospheric window. Thermal performance evaluation under simulated or outdoor solar irradiation provides a practical methodology to measure temperature reduction

relative to ambient conditions. The project structure assists students in understanding the balance between persistent luminescence and thermal emissivity, highlighting how polymer selection influences the overall cooling efficiency of composite films. By analyzing the re-emitted energy and mid-infrared radiative properties, this framework provides comprehensive guidance for the experimental design, fabrication, and thermal testing of functional polymer-matrix composites.

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