Luminescent characteristics of Dy3+ doped calcium zirconium phosphate CaZr4(PO4)6 (CZP) phosphor for warm-white LEDs

CaZr4(PO4)6:Dy3+ phosphors have been synthesized by a solid state reaction method. The phosphors were characterized with X-ray diffraction and photoluminescence spectra measurement. Under the excitation of 349 nm, the emission of CaZr4(PO4)6:0.06Dy3+ phosphor centered at 487 nm and 577 nm, corresponding to 4F9/2→6H15/2, 4F9/2→6H13/2 transitions of Dy3+, respectively. Concentration quenching occurred when the concentration of Dy3+ was beyond 6% due to the dipole-dipole interaction by nonradiative energy transfer. The CIE chromaticity coordinates of CZP: 0.06Dy3+ phosphor was (0.4219, 0.4322), with CCT (3436 K), which located in the warm white light region. The current results indicated that CaZr4(PO4)6:Dy3+ phosphors could be promising candidates for white LEDs.