Phosphorus at Nanoscale
SrAl2O4 co-doped with Eu and Dy (SrAl2O4:Eu2+, Dy3+) is one of the most widely used luminescent phosphors with strong and long persistent green emission. It is commonly accepted that the characteristic green emission results from the excitation and relaxation of Eu2+, while the long afterglow effect is due to electron trapping at Dy3+. The exact trapping mechanism is however still under debate due to the lack of clean and simple model system. In the frame of a KTI project, we are working, together with the Swiss producer RC TRITEC, to establish a model system based on single crystal film of SrAl2O4:Eu2+, Dy3+ for a better understanding of the luminescent mechanism.