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

Abstract

In the current work, the influence of Pluronic F-127 (S = F-127) and temperature on the luminescent properties of Gd 2 O 3 :Eu 3+ (Gd:S = 1:2) powders and films was studied. In order to synthesize the powders and films (by the dip-coating technique), Gd 2 O 3 : Eu 3+ (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 Gd 2 O 3 (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 Gd 2 O 3 : Eu 3+ -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 5 D 0 → 7 F 2 Eu 3+ transition (618 nm) was enhanced by the presence of F-127.

Laser performance and investigation of the optimal density functional and the dependence of the basis sets for (E, E)-2,5-bis (3,4-dimethoxystyryl) pyrazine (BDP) molecule

“…2a. Via applying the following equations [43], where D (nm) is the size of the nanocrystal administration sample, (nm) is the wavelength, and is the molar absorptivity of the first excitonic absorption peak of the corresponding sample. The used molar concentration of the D = 1.6122 × 10 −9 4 − 2.6575 × 10 −6 3 + 1.6242 × 10 −3 2 − (0.4277) + (41.57) = 5857(D) 2.65 synthesized CdS QDs was 6.6 × 10 -6 M and the CdS QDs size was 3-6 nm.…”

Luminescence properties of neodymium, samarium, and europium niobate and tantalate thin films

“…[10,23] By comparing the luminescence properties of the sol-gel-prepared Gd 2 O 3 :Eu 3+ film and powder, Murillo et al found that the film has a higher efficiency for energy translation from host to dopant, which means that the film would be more suitable than the powder as a luminescent material. [60] The disadvantages of films are low brightness and luminescence effectiveness relative to their correspondent powder phosphors. The structural characteristics and thickness of films are profusely connected to their luminescence efficiency.…”

Avaliação das propriedades fotônicas do material fotoluminescente à base de SiO2 e Gd2O3 triplamente-dopado com Er3+/Yb3+/Eu3+ para conversão de energia

“…Pode ser incorporado em diferentes matrizes hospedeiras em que há uma eficiente transferência de energia entre a matriz e este íon 111,112 . Estudos mostram a dopagem de Eu 3+ em matrizes como o Y2O3 [113][114][115] , NaGdF4 116,117 , Sr2CeO4 118 e Gd2O3 [119][120][121] .…”