Photoluminescence and Energy Transfer Study of Sr3Y_(0.96)(BO3)_(3:0.02)Ce _(0.02)~(3+)Mn~(2+)Phosphor for WLED Application

摘要

Sr3Y(BO3)3;Sr3Y0.98(BO3)_(3:0.02)Ce~(3+);Sr3Y0.98(BO3)_(3:0.02)Mn~(2+)Sr3Y_(0.96)(BO3):0.02Ce~(3+)0.02Mn~(2+)phosphors are synthesized by solution combustion method at 650 °C in muffle furnace.Synthesized phosphors are annealed at 950 °C for 3 h under weak reducing atmosphere provided by activated charcoal/carbon to achieve desire oxidation state of dopants.Photoluminescence study shows that Sr3Y0.98(BO3)_(3:0.02)Mn~(2+)phosphors converts blue light(462 nm)into red(614 nm)due to 4T1(4G)to 6A1(6s)transition of Mn~(2+)in host crystal.Sr3Y0.98(BO3)_(3:0.02)Ce~(3+)converts UV radiation(261 nm:2f5/2→5d1 of Ce~(3+))into blue light of wavelength 486 nm which is attributed to the inter-configuration 5d1→4f1 transition of Ce~(3+).In Sr3Y_(0.96)(BO3)_(3:0.02)Ce_(0.02)~(3+)Mn~(2+)phosphors resonant energy transfer occurs from Ce~(3+)to Mn~(2+)in host matrix,resulting into intense red emission(614 nm)from UV light(263 nm).Using photoluminescence intensity comparison,the study confirms the resonant-ET from sensitizer Ce~(3+)to activator Mn~(2+)in the crystal.So the report it as UV-activated red emitting phosphor for UV-PC-WLED.