Abstract
Photoluminescence (PL) and colorimetric properties of white-light emission SrAl 2Si 2O 8:Eu 2+,Mn 2+ phosphor were tuned effectively through incorporating Si-N bond to the host in the form of Si 3N 4. A maximum solubility of Si-N bond in SrAl 2 -x Si 2+ x O 8 -x N x was estimated theoretically to be in a value of x=1.0. Under 365 nm irradiation, a distinct red-shift of blue band emission from 406 to 473 nm for Eu 2+ and an enhancement of yellow band emission peaked at ∼565 nm for Mn 2+ were observed with the increase of Si-N content. These effects resulted from partial substitution of Si-N for Al1-O1 and Al4-O2 sites in SrAl 2Si 2O 8 lattice. Eventually, a white emission with CIE chromaticity coordinates (0.287, 0.337) and color rendering index (CRI) 78.3 for SrAl 2Si 2O 8:Eu 2+,Mn 2+ phosphor were achieved upon optimization to a suitable amount of Si-N.
Published Version
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