Fabrication and Luminescent properties of ZnWO 4 :Eu 3+ , Dy 3+ white light-emitting phosphors

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

“…Recently, many Eu 3? -doped tungstate based lattices (as host for the Eu 3? activators that emit the red light) have been reported for possible application as red conversion phosphors examples include CdWO 4 [2,3], SrWO 4 [4,5], Y 6 WO 12 [6], KLa(WO 4 ) 2 [7], RbGd(WO 4 ) 2 [8], NaY(WO 4 ) 2 [9], NaGd(WO 4 ) 2 [10], Na 2 Dy 4 (WO 4 ) 7 [11], La 2 W 2 O 9 [12], ZnWO 4 [13], Ba 4 Na 2 W 2 O 11 [14], MgWO 4 [15], and Li 2 Mg 2 (WO 4 ) 3 [16]. Some of these materials require high amounts of the expensive europium activator.…”

“…Considering the doping sites, characteristics such as distance between dopants, coordinate numbers, relative spatial position and electrical environments are also important in order to fully understand the photoluminescence properties [17]. Many tungstate lattices when acting as hosts for Eu 3? activators have been shown to manifest excellent luminescent efficiency and color purity as well as having high average refractive indexes [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Also this class of tungsten oxides can be considered as ideal host lattices for dopants as they possess high thermal, chemical and physical stability and in addition they can often be synthesized at low temperatures.…”

Warm‐white light performance of Dy3+, Eu3+: NaLa(WO4)2 phosphors excited with a 450‐nm LED

“…The energy band of [WO 4 ] 2− is located in the blue band of 450 nm, and [WO 4 ] 2− acts as a transit in the Dy 3+ , Eu 3+ energy electronic transition. 18 The energy potential well of [WO 4 ] 2− will distribute the electrons to 4 F 9/2 (Dy 3+ ) and 5 D 1 (Eu 3+ ). Considering the emission spectra shown in Figure 4, where the intensities at 575 nm remain nearly equal but the 612-616 nm intensities become stronger with increasing concentration of Eu 3+ , we can estimate that the electrons from [WO 4 ] 2− to 4 F 9/2 (Dy 3+ ), 5 the cross-relaxation process.…”

“…Many works have studied the technology of Dy 3+ , Eu 3+ codoped in phosphors in recent years . Different hosts provide different microcrystal doping environments and energy potential wells, which can slightly change the excited wavelength.…”

Photoluminescence Studies of ZnWO4:Sm3+ Synthesized by Ethylene Glycol Route

“…It is very interesting and widely investigated compound due to its potential applications in scientillation [8, photocatalyst [9], photoluminescence [6,8] and sensors [10,11] etc. Since ZnWO 4 is widely used scintillating crystal, the luminescence property of this material is largely investi-gated and it has been reported that the intrinsic luminescence is arise from the charge transfer transition within the WO6 6-complex [8,[12][13][14] (1, 2, 3, 5 and 7 at. %) crystals were prepared by co-precipitation method using ethylene glycol as reaction medium as well as capping agent.…”