Abstract:
The aim of the present work was to investigate the luminescent properties of
europium-doped lanthanum aluminate (LaAlO3) powder prepared by Modified
Pechini (MP) method. Samples were prepared at different Eu3+ concentrations
and calcined at 1600˚C. Structural and morphology characterizations
were obtained by X-ray diffraction (XRD), scanning electron microscopy
(SEM), and transmission electron microscope (TEM). Luminescent properties
were analyzed by photoluminescence (PL) and thermoluminescent phenomena.
The XRD pattern shows pure lanthanum aluminate oxide LaAlO3 with
a rhombohedral structure. Photoluminescence studies of the powders was related
to 4f → 4f(
5
D0 → 7
Fi
) (i = 1, 2, 3, 4) transitions of Eu3+ ion, the most intense
emission of Eu3+ in LaAlO3 was registered for the transition 5
D0 → 7
F1,
for 5% of Eu3+. The recorded TL glow curves of excited samples showed a
main TL peak, the main peak appeared its maximum as a function of excitation
energy. The investigation demonstrates that polycrystalline LaAlO3:Eu3+
powders calcined at 1600˚C have interesting luminescent characteristics.
