Abstract
Tb3+/Dy3+ co-doped Y6Si3O9N4:Ce3+ oxynitride phosphors were prepared in this work. The properties of the prepared phosphors, e.g. X-ray diffraction (XRD), photoluminescence (PL) spectra, lifetime and thermal-dependent luminescence quenching were investigated systematically. Under near-UV excitation, co-doped Tb3+ and Dy3+ into Y6Si3O9N4:Ce3+ phosphor generated a narrow green line peaked at 550 nm and a yellow line peaked at 575 nm, respectively. Energy is efficiently transferred from Ce3+ to Dy3+ and Tb3+ ions according to the study results. Fluorescence decay patterns are studied as a function of Tb3+ and Dy3+ concentrations. For the new synthesized phosphors, their temperature-dependent photoluminescence properties were investigated, which demonstrates that the emission intensity at 150 ○C reduced from 100% to 32.0% measured at 30○C. Commission on illumination value of color tumble emission is also discussed in detail. This work verifies the suitable application of the new oxynitride phosphor in the LEDs.
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