Energy transfer processes between rare earth ions and white light emission in inorganic glasses

摘要

In this paper, lead borate glasses singly, doubly and triply doped with rare earth ions were investigated using optical spectroscopy. Luminescence spectra of rare earths were detected under various excitation wavelengths. The main green luminescence band related to 5D4 → 7F5 transition of Tb3+ is observed under excitation of Dy3+. The main red emission band due to 5D0 → 7F2 transition of Eu3+ is well observed under direct excitation of Tb3+. In both cases, the energy transfer processes from Dy3+ to Tb3+ and from Tb3+ to Eu3+ in lead borate glasses occur. Lead borate glass triply doped with trivalent rare earths exhibits nearly white light emission originating from the simultaneous generation of several bands of Dy3+, Tb3+ and Eu3+ ions under selective UV-visible excitation.