Tunable light-emitting and enhanced thermal stability via co-doping Ce3+ and Eu2+ in Sr3Gd2(Si3O9)3.

A novel single-composition Sr 3 Gd 2 (Si 3 O 9 ) 3 (SGSO):Ce 3+ , Eu 2+ phosphor emitting blue-cyan lights was synthesized through conventional high temperature solid-state method. All samples were investigated by the X-ray diffraction, photoluminescence spectra, luminescence decay spectra and thermal photoluminescence. The Ce 3+ activated SGSO sample showed strong absorption bands ranging from 270 to 380 nm and a blue broadband peaked at 405 nm. After Eu 2+ were co-doped with Ce 3+ , the color tune of SGSO:Ce 3+ , Eu 2+ phosphors under the irradiation of 329 nm could be adjusted from blue (0.163, 0.031) to cyan (0.212, 0.290) through the efficient energy transfer between Ce 3+ and Eu 2+ ions. The corresponding energy transfer mechanism between Ce 3+ and Eu 2+ were also discussed systematically. The thermal stability of Ce 3+ and Eu 2+ ions in SGSO:Ce 3+ , Eu 2+ samples could be significant enhanced from 35.2% to 85.6% and 62.6% to 67.3% than single doped Ce 3+ or Eu 2+ due to the transformation of coordination environment around Ce 3+ and the energy transfer through Ce 3+ to Eu 2+ . Above properties demonstrate that the as-prepared SGSO:Ce 3+ , Eu 2+ samples might be potential phosphors applied in phosphor-converted devices. [ABSTRACT FROM AUTHOR]