Red, green and blue emissions coexistence in white-light-emitting Ca11(SiO4)4(BO3)2:Ce3+,Eu2+,Eu3+ phosphor

Abstract

Ce³⁺, Eu²⁺ and Eu³⁺ singly activated and Ce³⁺/Eu²⁺/Eu³⁺-coactivated Ca₁₁(SiO₄)₄(BO₃)₂ (CSB) phosphors were synthesized by novel and efficient aluminium reduction solid state reactions. Under ultraviolet light excitation, the Ce³⁺, Eu²⁺ and Eu³⁺ singly activated CSB phosphors exhibit intense red, green and blue emissions, respectively. The unique host CSB shows its superior advantages in color balance compared with the widely-used Ca₂SiO₄, Ca₃B₂O₆ and Y₃Al₅O₁₂. The red, green and blue colors can be controlled by the reduction temperature, and a white light emitting phosphor was obtained by reducing the as-prepared CSB:0.02Ce,0.005Eu powder at 700 °C for 8 h. The unique property of CSB in color balance was proposed to attribute to the group synergy effect. Furthermore, the energy transfer probability was discussed in detail, and the critical distance was calculated.