A near-ultraviolet (NUV) converting blue-violet Mg2-xAl3.96Si5.04O18:xCe3+ phosphor for white light-emitting-diodes (w-LEDs)

A phosphor Mg2-xAl3.96Si5.04O18:xCe3+, x = 0.02-0.14 for white NUV w-LEDs has been prepared using solid-state reaction method. The as-obtained phosphors have been investigated by fluorescence spectrophotometer and XRD, respectively. The XRD data demonstrate the aim phase has been synthesized and the diffraction peaks have shifted with the increasing of Ce3+ concentration. The Mg2-xAl3.96Si5.04O18:xCe3+ phosphor shows a strong blue-violet emission under the excitation of NUV radiation. The fitting results of the emission spectra show the emission spectrum contains two single bands, which come from the transition of 2D2/3 → 2F7/2 and 2F5/2 of the Ce3+ ion. The colorimetric coordinate of sample with x = 0.06 is (0.1499, 0.0704), locating in blue-violet region. We have obtained bright blue-violet light via pumping the sample by NUV light (λ ≈ 302 nm), suggesting that this material be potential as a NUV converting blue-violet phosphor for the NUV w-LEDs.