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Eu3+-Based Orange-Red-Emitting Inorganic Color Convertors: An Overview
Published in Sanjay J. Dhoble, B. Deva Prasad Raju, Vijay Singh, Phosphors Synthesis and Applications, 2018
ABO4 oxides such as silicates, phosphates, arsenates, vanadates, and chromates are likely to adopt a zircon structure with the space group I41/amd. It is also evidenced that a few ABO4 oxides such as germanates, molybdates, and tungstates crystallize in the scheelite structure with the space group I41/a. It is also reported that a wide range of molybdates, tungstates, and tantalates crystallize in the wolframite structure (P2/c, No. 13) and relatively few ABO4 oxides exist as M’fergusonite structures (P21/c, No. 14). Many ABO4 oxides transform from zircon or scheelite structures to M’fergusonite under pressure, and the fergusonite structure can be viewed as a distorted scheelite structure [28].
Luminescence properties of color-tunable YNbO4: Dy3+, Tm3+ phosphors
Published in Journal of Asian Ceramic Societies, 2020
Xin Wang, Xiangping Li, Sai Xu, Lihong Cheng, Jiashi Sun, Jinsu Zhang, Xizhen Zhang, Baojiu Chen
ANbO4 (A = Lu, Y, Gd) compounds have many interesting properties, including photocatalytic behavior and photoluminescence, and the luminescent property of niobates has been studied many years ago [22,23]. YNbO4, as a well-known self-activated phosphor, exhibits an efficient blue luminescence under UV light excitation [23]. Meanwhile, the YNbO4 structure has two structural types: tetragonal phase (T-scheelite, I41/a) at high temperatures and distorted monoclinic phase (M-fergusonite, C2/c) at low temperatures [24,25,26,27]. For the M-fergusonite structure, Y3+ ions exhibit D2d point symmetry and occupy 4e sites, and they are surrounded by 8-coordinated oxygen atoms forming a distorted cube [10–12]. Y3+ ions in YNbO4 host lattice can be easily replaced by other rare earth (RE3+) ions due to their similar ionic radii and the same valence state [28–30]. In this paper, Dy3+, Tm3+ single-doped and co-doped YNbO4 phosphors were prepared by a traditional high-temperature solid-state reaction method. The luminescence properties of YNbO4: Dy3+, Tm3+ samples were discussed.