Ln³⁺ (Eu³⁺ and Dy³⁺) luminescence in Ca₂SrAl₂O₆ phosphor for solid-state lighting

This article reports photoluminescence in Eu³⁺ and Dy³⁺ doped Ca₂SrAl₂O₆ aluminate phosphor. Here combustion technique is used to synthesize a series of phosphors. The excitation spectra of Ca₂SrAl₂O₆:Eu³⁺ phosphor appears at 396 nm, under which we get a prominent emission bands at 590–596 nm and another peak located at 616 nm that corresponds to the orange-red region. These spectral bands are assigned due to ⁵D₀→⁷F₁, ⁷F₂ electronic transitions of activator Eu³⁺ ion, respectively. Whereas, Ca₂SrAl₂O₆:Dy³⁺ phosphor shows two bands that correspond to 476 and 573 nm when excited by 352 nm. These two emission peaks correspond to the well-known ⁴F_9/2→⁶H_15/2, ⁶H_13/2 transitions of rare-earth Dy³⁺ ion, respectively. Thus, from the observed photoluminescence properties, it is seen that prepared aluminate phosphor may be a suitable material for solid-state lighting. (author)