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A novel orange emitting long-lasting phosphor based on LiSr 4 (BO 3 ) 3 host matrix was prepared by a solid-state reaction under a reductive atmosphere. Both diffuse reflectance spectra and photoluminescence emission spectra of the Eu 2+ -doped and Eu 2+ , Dy 3+ co-doped samples revealed only the 5d–4f transitions of Eu 2+ . The broad emission...
Ca 2 BO 3 Cl: Eu 2+ , Ln 3+ (Ln=Nd, Dy, Er) phosphors have been synthesized through the high temperature solid-state method. The emission spectra reveal one asymmetric broad band located at 580nm, ascribing to the 5d–4f transitions of Eu 2+ ions in two different sites. The incorporation of Ln 3+ ions, which act as trap centers, largely extends the thermoluminescence...
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