SrBi2TeO7:Eu3+: A novel blue-light excitable red-emitting phosphor for solid-state lighting

Abstract A series of novel bismuthate tellurate SrBi 2(1- x ) Eu 2 x TeO 7 ( x = 0.02–0.40) red-emitting phosphors were successfully prepared through a high-temperature solid-state reaction at 800 °C. The compounds crystallized in the cubic structure with the space group Pa 3 ¯ . Photoluminescence characteristics indicate that the SrBi 2 TeO 7 :Eu 3+ phosphor can be excited effectively under 465 nm irradiation, which matches well with the output wavelength of blue LED chips. The emission spectrum of SrBi 2 TeO 7 :Eu 3+ phosphor shows four peaks assigned to the 5 D 0 – 7 F J ( J = 0–4) transitions of Eu 3+ upon 394 and 465 nm excitation. The maximum photoluminescence intensity was found at 30 mol% in the SrBi 2 TeO 7 : x Eu 3+ phosphors. The quenching temperature for SrBi 2 TeO 7 :0.30Eu 3+ was revealed at 403 K by temperature dependent emission spectra. The CIE chromaticity coordinates of SrBi 2 TeO 7 :0.30Eu 3+ are very close to the National Television System Committee (NTSC) standard red.