화학공학소재연구정보센터
Materials Research Bulletin, Vol.95, 497-502, 2017
SrBi2TeO7:Eu3+: A novel blue-light excitable red-emitting phosphor for solid-state lighting
A series of novel bismuthate tellurate SrBi2(1-x)Eu2xTeO7 (x=0.02-0.40) red-emitting phosphors were successfully prepared through a high-temperature solid-state reaction at 800 degrees C. The compounds crystallized in the cubic structure with the space group Pa (3) over bar Photoluminescence characteristics indicate that the SrBi2TeO7:Eu3+ phosphor can be excited effectively under 465 nm irradiation, which matches well with the output wavelength of blue LED chips. The emission spectrum of SrBi2TeO7:Eu3+ phosphor shows four peaks assigned to the D-5(0)-F-7(J) (J= 0-4) transitions of Eu3+ upon 394 and 465 nm excitation. The maximum photoluminescence intensity was found at 30 mol% in the SrBi2TeO7:xEu(3+) phosphors. The quenching temperature for SrBi2TeO7:0.30Eu(3+) was revealed at 403 K by temperature dependent emission spectra. The CIE chromaticity coordinates of SrBi2TeO7:0.30Eu(3+) are very close to the National Television System Committee (NTSC) standard red. (C) 2017 Elsevier Ltd. All rights reserved.