Room temperature photoluminescence in crystalline/amorphous Er-doped Cd2V2O7

Pressure-induced phase transitions and electronic properties of Cd2V2O7

“…52,53 Next, we will compare our results for β-Cd 2 V 2 O 7 with the literature. As we mentioned before, there are discrepancies between experimental results and the band gap calculated with the B3LYP functional, some experimental results are 2.97 2 , 2.88, 3 2.84, 7 and 2.47-1.77 4 eV. These values are all more than 30% smaller than the calculated energy using HSE06 and B3LYP functionals.…”

“…Efforts for the precise characterization of electronic properties are also timely since there is a controversy in the literature regarding the band-gap energy (Eg), one of the key features for photocatalysis. In the literature, there are large discrepancies among the reported values for the band gap of Cd 2 V 2 O7: 2.97, 2 2.88, 3,6 2.84, 7 and 2.47-1.77 4 eV. In addition, these values are all substantially smaller than the band-gap energy of Mg 2 V 2 O 7 (Eg = 3.75 eV) 8 and Zn 2 V 2 O 7 (Eg = 3.95 eV).…”

“…All previous experiments have been carried out in nanocrystalline or powder samples. In them, the band gap has been determined either from photo-acoustic spectroscopy 4 or from diffuse-reflectance measurements. 2,3,7 In addition, diffuse reflectance measurements have been performed rather than transmittance measurement in single crystals.…”

“…1 Among them, cadmium pyrovanadate (Cd 2 V 2 O 7 ) has received remarkable attention because of its multiple possible technological uses. They include photocatalysis, 2,3 photoluminescence, 4 gas sensing, 5 among many others. For the optimization of these applications an accurate characterization of the physical properties is beneficial.…”

Crystal structure of Ca2Zn2(V4O14) and Pb2Cd2(V3O10)(VO4) double vanadates

“…The pyrovanadates M 2 V 2 O 7 , where M = Ca, Sr, Pb, Ba, Mg, Zn, Co, Ni, Cu, Mn, Cd, demonstrate promising magnetic (Bhatia et al ., 2010; Basiev et al ., 2011; Sanchez-Andujar et al ., 2011), optical (Cid-García et al ., 2012; Dalal et al ., 2015; Takahashi et al , 2016), and electrical (Cowin et al ., 2011) properties. The physico-chemical properties and structures of divalent metal vanadates have been studied in depth.…”