A novel red emitting phosphor LiBaB O :Sm /Sm , li with broad excitation band for white LEDs.

A novel tunable red emitting phosphor LiBaB O :Sm /Sm , Li with broad excitation band was synthesized by a high temperature solid-state method. Luminescence properties were investigated in detail by luminescence, X-ray photoelectron spectroscopy (XPS) spectra and CIE chromaticity coordinates. XPS data confirmed that there were Sm in LiBaB O :Sm and Sm /Sm in LiBaB O :Sm /Sm , respectively. Spectral property of LiBaB O :Sm , LiBaB O :Sm /Sm and LiBaB O :Sm , Li presented that the excitation band of Sm widened and the excitation band of Sm ranged from 350 to 450 nm. And the red light color is tunable with changing Li concentration. The results indicated that LiBaB O :Sm /Sm , Li may be promising red phosphor for white light emitting diodes.