New Eu 3+-doped Gd 4 Mo 7 O 27 crystals (the molar ratio of Gd 2 O 3 /MoO 3 = 1/3.5) with a monoclinic structure C2/c (an inversion symmetry) were synthesized through the crystallization of xEu 2 O 3-(18.89-x)Gd 2 O 3-66.11MoO 3-15B 2 O 3-1Al 2 O 3 glasses (x = 0.0472 and 1.889) and photoluminescence (PL) emissions of Eu 3+ ions were measured for the first time. The crystallized glass with no Eu 2 O 3 addition (x = 0) showed a blue color under the irradiation of ultraviolet light with a wavelength of λ = 254 nm, the emitting color of the crystallized glass with x = 0.0472 was pink, and that of the crystallized glass with x = 1.889 was orange. The charge transfer (CT) of O 2-→Mo 6+ providing broad peaks centered at around 325 nm was observed in the crystallized glasses. The peak intensity at 591 nm for the 5 D 0 → 7 F 1 transition of Eu 3+ ions in the crystallized glasses with x = 0.0472 and 1.889 was very close to that at 615 nm for the 5 D 0 → 7 F 2 transition for the excitation of λ ex = 394.5 nm. We propose potential of Gd 4 Mo 7 O 27 as a new host crystal for rare-earth-doped phosphors.
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