F-127-Assisted Sol-Gel Synthesis of Gd2O3:Eu3+ Powders and Films

• Autor(a) principal: Murillo,Antonieta García
• Data de Publicação: 2019
• Outros Autores: Calderon,Víctor Hugo Colín, Romo,Felipe de Jesús Carrillo, Velázquez,Dulce Yolotzin Medina
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000300210
• topic: Gd2O3; Pluronic F-127; sol-gel; powders; films; europium

In the current work, the influence of Pluronic F-127 (S = F-127) and temperature on the luminescent properties of Gd2O3:Eu3+ (Gd:S = 1:2) powders and films was studied. In order to synthesize the powders and films (by the dip-coating technique), Gd2O3: Eu3+ (5 mol%) ceramics were elaborated by the sol-gel route, using gadolinium and europium nitrates as precursors. The results obtained by means of X-ray diffraction, confirmed the presence of the cubic structure of Gd2O3 (in 800 ºC heat-treated powders and 700 ºC heat-treated films), and crystals with nanometer sizes of ~19 nm, and ~15 nm, corresponding to the spherical and laminar-like morphologies of densified powders and films, respectively. Crystallites from the cubic and monoclinic structure were present on Gd2O3: Eu3+-modified films up to 800 ºC. Chemical identification of the bonds present in the films was performed by Fourier transform infrared spectroscopy, which identified representative infrared absorption at 543 cm-1, attributable to the Gd-O vibration. Photoluminescence studies showed that when the powders and films were heat-treated at 800 ºC, the intensity of their luminescence at the 5D0→7F2 Eu3+ transition (618 nm) was enhanced by the presence of F-127.