Cationic substitution induced tuning of photoluminescence in (Sr, Ba)P4O13:Eu2+ solid solution phosphors

Abstract

Cationic substitution is an important and simple method for the tuning of photoluminescence in Eu2+ doped inorganic luminescence materials. In present work, Eu2+ doped alkaline earth metal tetraphosphate phosphors (Sr, Ba)P4O13:Eu2+ have been synthesized successfully by solid-state reaction at high temperature. XRD results indicated the formation of single-phase solid solution phosphors (not the mixture of Sr3P4O13:Eu2+ and Ba3P4O13:Eu2+). These phosphors shows the broad excitation band in the ultraviolet (UV) and near ultraviolet (NUV) region ascribed to be the allowed 4f-5d transition of Eu2+. By the progressive substitution of Sr by Ba, the emission maximum shows obvious red-shift from 404nm to 468nm upon excitation with UV light, which leads to the tunable photoluminescence of these solid solution phosphors. The obtained results indicated that the (Sr, Ba)P4O13:Eu2+ solid solution phosphors shows the potential application for white light-emitting diodes based on UV/NUV chips.