Luminescence characterization of KBaPO :RE (RE = Sm ,Eu ,Dy ) phosphors.

KBaPO luminescent powdered phosphors doped with rare earth elements (RE = Sm ,Eu ,Dy ) were successfully synthesized using a wet chemical method to identify the most suitable phosphor for solid-state lighting based on the measurement of their emission spectra at excitation wavelengths. The X-ray diffraction pattern of the as-prepared KBaPO was well matched with its standard JCPDS file no. 330996, indicating the formation of the desired compound. Scanning electron microscopy images revealed irregular morphology, the material crystallized particles aggregated and were non-uniform with particle sizes ranging from 1 to 100 μm. Photoluminescence excitation and emission spectra clearly indicated that the phosphor containing the Sm -activated KBaPO phosphors could be efficiently excited at 403 nm and exhibited an emission mainly including two wavelength peaks at 559 nm and 597 nm. The phosphor containing the Eu -activated KBaPO phosphors could be efficiently excited at 396 nm and exhibited a bright red emission mainly including two wavelength peaks at 594 nm and 617 nm. The phosphor containing the Dy -activated KBaPO phosphors could be efficiently excited at 349 nm and exhibited wavelength peaks at 474 nm and 570 nm.