Synthesis and luminescence properties of novel LiSr4(BO3)3:Dy3+ phosphors

Abstract The LiSr 4 (BO 3 ) 3 :Dy 3+ phosphors were synthesized in air by solid-state reaction route. The as-synthesized phosphors were characterized by X-ray powder diffraction (XRD), photoluminescence excitation (PLE) and photoluminescence (PL) spectra. The PLE spectra show the excitation peaks from 300 to 400 nm is due to the 4f – 4f transitions of Dy 3+ . This mercury-free excitation is useful for solid state lighting and light-emitting diodes (LEDs). The emission of Dy 3+ ions upon 350 nm excitation is observed at 481 nm (blue) due to the 4 F 9/2 → 6 H 15/2 transitions, and 575 nm (yellow) due to 4 F 9/2 → 6 H 13/2 transitions. The optimal PL intensity of the LiSr 4 (BO 3 ) 3 :Dy 3+ phosphors under 350 nm excitation is found to be at the concentration of x =0.02 and the synthesis temperature at 1000 °C. The CIE chromaticity coordinates for LiSr 4 (BO 3 ) 3 :Dy 3+ phosphors are simulated and located in the bluish-white region. All the results imply that the studied LiSr 4 (BO 3 ) 3 :Dy 3+ phosphors could be potentially used as white LEDs.