Photoluminescence And Color-Tunable Properties Of Na4ca4mg21(Po4)(18):Eu2+,Tb3+/Mn2+ Phosphors For Applications In White Leds

Here, the crystal structure, phase analysis, site occupancy, and luminescence properties of NCMP:Eu2+,Tb3+,Mn2+ have been studied for the first time. Under 335 nm ultraviolet excitation, the NCMP:Eu2+ phosphors show narrow-band blue emission. In addition, we discuss the reason for a continuous red shift for the emission spectra of NCMP:xEu(2+) by raising the x value. The efficient ET processes of Eu2+ -> Tb3+ and Eu2+ -> Mn2+ were investigated by the luminescence spectra and decay curves. The ET efficiencies reach 92.58% at y = 0.15 for NCMP:0.01Eu(2+),yTb(3+) and 99.85% at z = 0.15 for NCMP:0.01Eu(2+),zMn(2+) phosphors, respectively. The efficient energy transfer processes greatly improve the quantum efficiency, luminous intensity, and thermal stability. Bright green and red emissions can be realized through changing the related ratio of Eu2+, Tb3+, and Mn2+. In addition, the excellent performance of the prepared white LED lamps utilizing a 385 nm chip combined with our prepared NCMP:Eu2+,Tb3+/Mn2+ phosphors indicates that NCMP:0.01Eu(2+),yTb(3+) and NCMP:0.01Eu(2+),zMn(2+) phosphors can be potential green and red phosphors for white LEDs.