Photoluminescent behaviour of Ce3+ ions in mixed fluoride structures

摘要： Investigations were done to modify the photoluminescence (PL) spectra of a cerium (Ce3+) doped strontium fluoride (SrF2:Ce3+) phosphor for better sensitization for solar cell application. For optimum sensitization it is needed that Ce3+ emission overlaps with Lanthanide (Ln3+) ions’ excitation energy ranges. SrF2:Ce3+ emission, however, does not overlap well with different 4f-4f Ln3+ ions’ excitation ranges. The PL behavior of Ce3+ in Sr1-xMxF2:Ce3+ (where M = Ca, Ba, Mg, La) was therefore investigated. Noticeable changes were observed in the shape of the excitation and emission spectra of Ce3+. The Sr0.49Ba0.50Ce0.01F2 phosphor produced a significant red shift with a broad emission band. The excitation spectrum of this sample was blue shifted if compared to the singly doped sample.