The excitation spectra of Sr2La2−xMgW2O12:xEu3+ phosphor while monitoring at 613 nm corresponding to the 5D0–7F2 transition of Eu3+ is shown in Fig. 2. It can be seen that CMX001 the excitation spectra consist of 2 parts: one is an intense, broad band from 250 nm to 350 nm, and another is sharp lines from 350 nm to 500 nm. The broad band blow 350 nm is attributed to the change transfer (CT) transition between metal cations and oxygen anions  and . The spectrum above 350 nm shows several sharp peaks, and all of them are attributed to the Eu3+ ions’ characteristic 4f–4f transitions 362 nm (7F0–5D4), 382 nm (7F0–5G4,5L7), 393 nm (7F0–5L6), 415 nm (7F0–5D3), 464 nm (7F0–5D2) and 533 nm (7F0-5D1), respectively. The intensity of highest peak observed at 464 nm is stronger than that of the peak caused by CTB (charge transfer band), indicating that there is a weak nonradiative absorption and high energy conversion.