Facile selective synthesis and luminescence behavior of hierarchical NaY(WO4)2:Eu3+ and Y6WO12:Eu3+

Hydrothermal synthesis, multicolor tunable luminescence and energy transfer of Eu3+ or/and Tb3+ activated NaY(WO4)2 nanophosphors

“…Tungstates are well-known classical self-activated luminescence materials, which can effectively absorb ultraviolet (UV) and X-ray, then simultaneously migrate the absorbed energy to the doped rare-earth ions through energy transfer, and give their characteristic emissions. Therefore, they are recently considered as promising host materials for rare-earth luminescent centers because of the special properties of WO 4 2-& Guixia Liu liuguixia22@163.com group [11][12][13][14]. From the report of Huang et al [15], it was seen that tungstate host essentially showed a little weaker blue emission at room temperature compared to the absorption in excitation spectrum, owing to efficient energy transfer from WO 4 2-group to activators.…”

“…For example, Zheng et al [12] [16,20,26,27], and industrial productions of rare earth tungstates are all obtained by this method. However, there are some insurmountable defects in high temperature solid state reaction such as high temperature, long time, high energy consumption making more high-cost and depletion of energy.…”

“…In consideration of this problem, the hydrothermal method is preferred because the synthesis conditions such as temperature and reaction time can be easily adjusted. Furthermore, the hydrothermal process has proved to be a facile and fast route with low cost and energy consumption, which has been widely employed for the synthesis of inorganic materials including alkali rare earth tungstates [11,12,[28][29][30]. Among the alkali rare earth tungstates, the NaY(WO 4 ) 2 lattice belongs to the scheelite CaWO 4 structures, which consists of two formula units in the unit cell, with space group C 4h 6 (I41/a).…”

Citric acid-mediated microwave-assisted hydrothermal synthesis and luminescence property of NaSm(MoO4)2 submicro-crystals

“…, Sm 3? and MoO 4 2- [24]. Figure 2 shows the representative SEM images of the products obtained in the presence of different amounts of citric acid with the same other synthetic conditions.…”

Hydrothermal synthesis of NaY(WO4)2:Tb3+ powders with assistance of surfactant and luminescence properties

“…Till now, lots of rare earth doped inorganic materials, including borate, phosphate, aluminate, tungstate, and silicate have been synthesized by different methods [1][2][3][4][5][6][7][8][9]. As one kind of important solid-state materials, rare-earth tungstates have gained much attention because of their remarkable properties in the areas of catalysts, quantum electronics and lasers [7].…”