Luminescent properties of LaKNaTaO5 and rare-earth-doped LaKNaTaO5 synthesized by an improved hydroxide melt method

► Single crystal of LaKNaTaO5 was facilely obtained in corundum crucible. ► SEM and EDS results demonstrated the feasibility of the method. ► Photoluminescence properties of LaKNaTaO5 and samples doped with Eu3+ and Tb3+.