Luminescence of Ce 3+-doped aluminoborates, M 3Al 6B 8O 24 (M = Mg, Ca, Sr, Ba)

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Newer dielectric materials doped with appropriate impurities are often sought for tunable blue laser applications. Thus, the luminescence properties of Ce 3+ in the novel ternary borates, M 3 Al 6 B 8 O 24 (M = Mg, Ca, Sr, Ba) have been investigated. The single excitation band centred around 310 nm and the broad emission band maximising around 400 nm are devoid of the characteristic Ce 3+ doublet and the vibrational fine structures, even at low temperatures. These luminescence features are due to the extensive crystal-field splitting of the 4f ground state. The large Stokes shift of ∼7000 cm −1 and the half-band-widths are influenced by M 2+ ions.