科研之友
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摘要
A new green-emitting phosphor of Ce3+-doped CaGd4F14 (1-15 mol%) was synthesized by a facile solid-phase reaction. The crystal phase was investigated via X-ray polycrystalline powder diffraction (XRD) and Rietveld refinement. The scanning electron microscopy (SEM), photoluminescence (PL), decay lifetime and quantum efficiency (QE) were applied to characterize the phosphor. The phosphor shows the excitable wavelength in the UV region of (220-320 nm).CaGd(4)FA:Ce3+ has a green-emission band from 400 to 625 nm with maximum wavelength at 525 nm, which is the typical electronic transitions of 4f-5d of Ce3+-ions. The maximum QE was measured to be 67%. And the phosphor presents good thermal luminescence stability on temperature quenching. The thermal quenching energy is 0.503 eV. This phosphor has a potential application in lighting and display.
