Synthesis, IR and optical Absorption Studies of MAlO3 (M=La,Y) doped with Tb3+, Eu3+ Nano Phosphors.

Tb³⁺, Eu³⁺ -doped MAlO₃(M=La,Y) powder nano phosphors have been prepared at furnace temperatures of 900 °C for LaAlO₃ and 1100°C for YAlO₃ by using a low cost synthesis technique named polyol method. Powder X-ray diffraction and Fourier-transform infrared spectrometry measurements were used to characterize the as-prepared samples, while the optical properties were studied using UV–Vis spectroscopy. XRD reports confirm the cubic, orthorhombic phases of LaAlO₃ and YAlO₃ respectively. The absorption peak in the range 450–800 cm^-1 is due to Al−O stretching in LaAlO₃, bands in that region are corresponding to stretching vibration modes of metal–oxygen bonds (Al–O and Y–O). It was observed that the band-to-band absorption of LaAlO₃ and YAlO₃ host is about 220 nm. [ABSTRACT FROM AUTHOR]