Eu2+‐Doped Yellow‐Emitting CsBaB3O6 Glass‐Ceramic Prepared by Melt Quenching and Re‐Crystallization Method

Abstract

Eu3+‐doped cesium barium borate glass with the composition of Cs2O·2BaO·3B2O3 was prepared by the conventional melt quenching method. The glass‐ceramic sample was obtained from the re‐crystallization of the as‐made glass to change the amorphous glass into a crystalline host. This reduces the Eu3+ in glass to Eu2+ ions resulting in a yellow‐emitting phosphor of Eu2+‐activated CsBaB3O6. The samples were investigated by the XRD patterns and SEM micrograph, the optical absorption, the photoluminescence spectra, and decay curves. The as‐made glass has only Eu3+ centers. Under the excitation of blue or near‐UV light, Eu2+‐doped CsBaB3O6 presents yellow‐emitting color from the allowed inter‐configurational 4f–5d transition in the Eu2+ ions. The maximum absolute luminescence quantum efficiencies of Eu2+‐doped CsBaB3O6 phosphor was measured to be 47% excited at 430 nm light at 300 K. By taking into account the efficient excitation in blue wavelength region, this new phosphor could be a potential yellow‐emitting phosphor for an application in white light‐emitting diodes fabricated with blue chips.