Enhancement and quenching photoluminescence effects for rare earth - Doped lead bismuth gallate glasses

Lead bismuth gallate glasses doped with Eu3+ and Dy3+ ions were examined using excitation and luminescence measurements. From excitation spectrum of Eu3+ ions the electron-phonon coupling strength and phonon energy of the glass host was calculated. Strong luminescence quenching of Dy3+ and enhancement of Eu3+ is well observed, which is due to presence of Bi3+ → Eu3+ and Dy3+ → Bi3+ energy transfer processes in lead bismuth gallate glass. Luminescence decay analysis and calculations based on Inokuti-Hirayama model confirms this hypothesis.