Luminescent properties of Sr2P2O7:Eu,Mn phosphor under near UV excitation

Abstract The phosphors in the system Sr 2− x − y P 2 O 7 : x Eu 2+ , y Mn 2+ were synthesized by solid-state reactions and their photoluminescence properties were investigated. These phosphors have strong absorption in the near UV region, which is suitable for excitation of ultraviolet light emitting diodes (UVLEDs). The orange-reddish emission of Mn 2+ in these phosphors can be used as a red component in the tri-color system and may be enhanced by adjusting the Mn 2+ /Eu 2+ ratio. The energy transfer from Eu 2+ to Mn 2+ is observed with a transfer efficiency of ∼0.45 and a critical distance of ∼10 A. The results reveal that Sr 2− x − y P 2 O 7 : x Eu 2+ , y Mn 2+ phosphors could be used in white light UVLEDs.