文摘
Novel blue-green emitting Cep>3+p>- and Tbp>3+p>-activated K2CaP2O7 (KCPO) luminescent materials were synthesized via a solid-state reaction method. X-ray diffraction, luminescence spectroscopy, decay time, and fluorescent thermal stability tests have been used to characterize the prepared samples. The KCPO:Cep>3+p>,Tbp>3+p> luminescence spectra show broad band of Cep>3+p> ions and characteristic line of Tbp>3+p> ion transition (p>5p>D4–p>7p>F5). The color variation in the light emitting from blue to green under UV excitation can be obtained by tailoring the Tbp>3+p> content in KCPO:Cep>3+p>. Besides, Cep>3+p> ions obviously intensify Tbp>3+p> ion emission through an effective energy transfer process, which was confirmed from decay curves. The energy transfer efficiency was determined to be 82.51%. A resonant type mechanism via the dipole–quadrupole interaction can be proposed for energy transfer. As a whole, the KCPO:Cep>3+p>,Tbp>3+p> phosphor exhibits excellent performance in the range from 77 to 673 K, indicating the phosphors are highly potential candidates for solid-state lighting.