Solid state synthesis and luminescent properties of bright blue‑emitting Ba_2P_2O_7: Eu~(2+) phosphor

摘要

Eu~(2+)-activated Ba_2P_2O_7pyrophosphates were successfully synthesized by the solid-state reaction under reduced atmosphereand were characterized by X-ray diffraction (XRD) and Nuclear magnetic resonance and infrared (IR)/Raman spectroscopy.The luminescence properties of Ba_(2−x)P_2O_7: xEu~(2+)(x = 0.01, 0.05) phosphors were investigated in ultraviolet(UV) and vacuum ultraviolet (VUV) regions. Under 131 or 320 nm excitation, the phosphors exhibit a blue emittingband ranging from 350 to 500 nm, which is provided corresponding to the 5d–4f transition of Eu~(2+).The as-synthesizedphosphors present good thermal luminescence stability on temperature quenching and high color purity with the CIEcoordinate (0.172, 0.031) for Ba_2P_2O_7:1%Eu~(2+) phosphor. These results suggest that the Ba_2P_2O_7:Eu~(2+) pyrophosphate mightbe a promising blue-emitting phosphor for near ultraviolet (n-UV) light-emitting diodes (LEDs).