Abstract
The LiSr4(BO3)3:Dy3+ 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 400nm is due to the 4f–4f transitions of Dy3+. This mercury-free excitation is useful for solid state lighting and light-emitting diodes (LEDs). The emission of Dy3+ ions upon 350nm excitation is observed at 481nm (blue) due to the 4F9/2→6H15/2 transitions, and 575nm (yellow) due to 4F9/2→6H13/2 transitions. The optimal PL intensity of the LiSr4(BO3)3:Dy3+ phosphors under 350nm excitation is found to be at the concentration of x=0.02 and the synthesis temperature at 1000°C. The CIE chromaticity coordinates for LiSr4(BO3)3:Dy3+ phosphors are simulated and located in the bluish-white region. All the results imply that the studied LiSr4(BO3)3:Dy3+ phosphors could be potentially used as white LEDs.
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