Hydrothermally-induced morphological transformation of GdVO4:Eu3+

Facile synthesis of lanthanide vanadates and their luminescent properties

“…The narrow band at 617 nm is the electric dipole transition with Eu 3+ ions 5 D 0 -7 F 2 . The band at 595 nm corresponds to the transition of Eu 3+ ions 5 D 0 -7 F 1 [15][16][17][18]. The peaks at 540 and 700 nm were corresponding to the transitions of Eu 3+ ions 5 D 1 -7 F 1 and 5 D 0 -7 F 4 .…”

“…The doped Bi 3+ and Eu 3+ ions replace the site of the Gd 3+ cation when they enter into the tetragonal structure. It is considered that the acidity of the solution will be closely related to the formation of crystal structure [11]. Accordingly, we study the effects of the pH value via the powder XRD pattern compared with JCPDS Card No.…”

“…Among them, lanthanide doped vanadate has been extensively studied owing to the excellent luminescence efficiency, stable physical and chemical properties and the abundant luminous colors [3][4][5]. Especially gadolinium vanadate has been paid much attention based on better laser performance, higher thermal conductivity, a larger emission or adsorption cross-sections [6,7]. It is also known that the half-filled shell ground state of the gadolinium leads to the phosphors with lowest excited levels and relatively high energy [6,7].…”

“…Especially gadolinium vanadate has been paid much attention based on better laser performance, higher thermal conductivity, a larger emission or adsorption cross-sections [6,7]. It is also known that the half-filled shell ground state of the gadolinium leads to the phosphors with lowest excited levels and relatively high energy [6,7]. The encapsulated Eu 3+ ions with the parity forbidden characteristics usually exhibits strong red line emissions [7,8], The resultant composite has high color purity and can be used for the fabrication of red phosphors [9,10].…”

Investigation of the effects of temperature and time on reduction of graphene oxide by microwave hydrothermal reactor

“…Such disorders prevent obtaining graphene sheets with high electrical conductivities. 15 So * Author for correspondence (kimia@khayam.ut.ac.ir) far, some environment-friendly methods for the reduction of GO such as flash photoreduction, 16 laser irradiation, 17 UV irradiation, 18 commercial microwave oven 19 and hydrothermal dehydration 20 have been suggested as suitable substitutions for the common reduction methods.…”