Abstract
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.
Highlights
The luminescence of rare earth (RE)-doped oxides (Ln2O3, Ln = RE) has been of great interest in recent decades, due to their applications in optoelectronic devices and to their sufficient brightness, high chemical stability, low phonon energy, and long-term stability . 1,2,3 Gd2O3, considered an appropriate matrix for doping with europium due to its good luminescent characteristics and low phononic energy, presents a characteristic emission at 612 nm, corresponding to the transition 5D0 - 7F2 in the Eu used in panel display devices, such as PDPs 4, electroluminescent devices (ELDs) 5, fluorescent lamps 6, and so forth
We report on the synthesis of Gd2O3:Eu3+ powders and films modified with a surfactant
The X-ray diffraction patterns of the Gd2O3:Eu3+ (5 mol%) powders and films heat-treated at temperatures ranging from 300 to 800 oC and synthesized with F-127 are depicted in Fig. 1a and Fig. 1b, respectively
Summary
1,2,3 Gd2O3, considered an appropriate matrix for doping with europium due to its good luminescent characteristics and low phononic energy, presents a characteristic emission at 612 nm, corresponding to the transition 5D0 - 7F2 in the Eu used in panel display devices, such as PDPs 4, electroluminescent devices (ELDs) 5, fluorescent lamps 6, and so forth. There are several methods for preparing Gd2O3: Eu+3, such as by the combustion 9, Pechini 10, sol-gel , 11,12 polyol 13,14 and hydrothermal 15 methods, as well as others, giving rise to different morphologies and particle sizes, making it possible to modify the intensity of the luminescent emissions. We report on the synthesis of Gd2O3:Eu3+ powders and films modified with a surfactant Their influence of Gd2O3:Eu3+ on structural and morphological characteristics was analyzed by infrared spectroscopy (FTIR), X-ray diffraction, and SEM, and the emission characteristics of the as-prepared powders and films were investigated using photoluminescence
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