Abstract:

The system Al2O3-B2O3-Eu2O3, with Al/B ratio varying from 4.5 to 2 and Eu/(Al+B)=0.02, was synthesized by solid state reaction. The vibrational spectra of the sys tem Al2O3-B2O3 were investigated. It was found that no definite change in the regions of 12001000cm-1 due to the absorption BO4 groups with decreasing Al/B ratio, indicating no Al3+ion was substituted by Eu3+ ions and other changs revealed that there was an amorphous phase and Eu3+ ions may dope into the amorphous phase. The studies on the luminescent properties of the system Al2O3-B2O3 also show that Eu3+ ions dope into amorphous phase. The investigations on the phonon sideband of Eu3+ indicate that electron-phonon coupling strength decreases with Al/B ratio change from 3 to 2, leading to the non-radiative decay rate decreases and the Eu3+ennssion intensity increase.

Key words: Eu3+ ions, Vibrational spectra, Luminescent properties of Eu3+ ion, Phonon sideband