ABSTRACT The Ba 1− x Ca x MoO 4 and BaMo 1− x W x O 4 ( x = 0.5–0.9) phosphors were synthesized by the polyacrylamide gel method. The introduction of Ca ion into BaMoO 4 formed a type I heterojunction between BaMoO 4 and CaMoO 4 , while W ion was added to BaMoO 4 formed a single phase of BaMo 1− x W x O 4 . The interaction between interfaces and defects causes a reduction in the band gap ( E g ) value of the Ba 1− x Ca x MoO 4 phosphor and an increase in the E g value of the BaMo 1− x W x O 4 phosphor due to the Burstein–Moss effect compared to BaMoO 4 . The orange‐red fluorescence peaks at 638 and 680 nm were detected in Ba 1− x Ca x MoO 4 due to the formation of a type I band arrangement heterojunction, as well as the defects at the interface, as a result of a 530‐nm excitation wavelength. The difference is that when excited by a wavelength of 256 nm, the BaMo 1− x W x O 4 phosphor emits purple and blue light emission peaks at 378 and 424 nm, respectively. The 1 T 2 → 1 A 1 transition in MoO 4 2− and WO 4 2− leads to the blue‐violet luminescence of the BaMo 1− x W x O 4 phosphor. These phosphors have been found to be suitable for dynamic anticounterfeiting and fingerprint recognition applications due to their special interface defect and spatial charge transfer.
Yang et al. (Sun,) studied this question.
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