Luminescence and energy transfer of La5Si2BO13: A (A=Ce3+/Tb3+/Eu3+/Sm3+) phosphors under UV excitation

Abstract Ce 3+ , Tb 3+ co-doped and Ce 3+ , Tb 3+ , Eu 3+ /Sm 3+ tri-doped La 5 Si 2 BO 13 (LSBO) were synthesized by solid-state method. Green Tb 3+ emission and red Eu 3+ /Sm 3+ emission could be efficiently sensitized by Ce 3+ . Using Tb 3+ concentration that predicted by empirical saturation distance ( R c =6–7A), a terbium bridge is successfully formed and efficient Ce 3+ →Tb 3+ →Eu 3+ /Sm 3+ energy transfer is realized in LSBO lattice. Under UV excitation, La 5 Si 2 BO 13 : Ce 3+ , Tb 3+ , Eu 3+ /Sm 3+ system can achieve tunable emission from blue through yellowish-green to red by changing the Tb 3+ /Eu 3+ /Sm 3+ concentration.