Abstract
In recent years, white light emitting diodes (LEDs) as a typical green lighting source have attracted great attention. A promising red phosphor for LEDs, (Ba0.8Eu0.1Li0.1)2Gd0.67W1 − x Mo x O6 solid solution, was synthesized by a high-temperature solid-state reaction. The excitation spectra of phosphors can be broadened by substituting Mo for W, which has good absorption in the near ultraviolet region. We measured the X-ray diffraction, absorption spectra, excitation spectra and emission spectra of these solid solutions, and analyzed their crystal structures. This series of phosphors present a relatively effective excitation band in the near-UV region (370–425 nm) from the charge transfer state of MoO6 and orange-red luminescence at 596 nm from the 5D0 → 7F1 transition. With increasing molybdate content, the luminescence intensity of (Ba0.8Eu0.1Li0.1)2Gd0.67W1−x Mo x O6 (x = 0.15–0.6), increases first and then decreases, and reaches a maximum at x = 0.4. The red phosphor excited by near ultraviolet light provides a reference value for white LEDs.