Preparation, structure, and photoluminescence properties of new layered borates KBaRE(B3O6)2 (REÂ =Â Y, Eu, and Tb)

► Syntheses of new borates KBaRE(B3O6)2 (RE = Y, Eu, and Tb). ► Crystal growth and structure of KBaY(B3O6)2. ► Photoluminescence properties of KBaEu(B3O6)2 and KBaTb(B3O6)2.