Synthesis and photoluminescence of blue LED excitable La4Ti9O24:Eu3+ phosphor for red-light emission

Abstract Eu 3+ activated La 4 Ti 9 O 24 phosphors were prepared by firing precursors from sol–gel method. Under the excitation of 465 nm light, the phosphor with optimized concentration at 3% shows strong red light emission peaked at 613 nm with high color purity owing to 5 D 0  →  7 F 2 emission of Eu 3+ . When adequate amount of either Si 4+ or Bi 3+ is incorporated in La 4 Ti 9 O 24 host, the photoluminescence intensity of as-prepared La 4 Ti 9 O 24 :Eu 3+ phosphor can be enhanced by 12% and 19.4%, respectively. As the (La 0.97 Eu 0.03 ) 4 Ti 9 O 24 is pumped with blue-light, high purity red emission with chromaticity coordinates (0.6380, 0.3616) is achieved at the optimized condition. This phosphor might be applied in the solid-state white light emission devices based on blue light-emitting diodes.