Abstract
Photoluminescent composite of poly-ethyleneterephtalate-SrAl2O4: EU2+, Dy3+ was prepared by of a new procedure based on mixing the constituents in specific solvents for PET. In a first step it was studied the possibility of preparing europium and dysprosium doped strontium aluminate using a method that allows obtaining crystals in nanometric range compatible with polymer matrix. Also, the dependence of transparency in UV-VIS range of the polymer matrix density and experimental paths for obtaining a low crystallinity of PET at co-precipitation from solution were investigated. Characteristics of absorption / photonic emissions, phosphorescent decay time were investigated for europium/dysprosium doped strontium aluminate, and respectively for the composite prepared. The prepared photoluminescent composite presents a series of applications in optoelectronics, highway/ railway and utilitarian signaletics. Keywords: long persistence phosphorescent compounds, phosphorescent composites, polymer matrix, polyethyleneterphtalate