Abstract
A series of Dy3+ (0–1 mol%) and Li+ (0.05–1.5 mol%) co-doped zirconium oxide (ZrO2) nanopowders are prepared via coprecipitation, followed by a hydrothermal treatment in nitrogen atmosphere. It was found an optimal concentration of Dy-doped ZrO2 (0.5 mol %) with high emission, showing peaks at 490 nm (blue) and 577 nm (yellow) corresponding to 4F9/2 → 6H15/2, and 4F9/2 → 6H13/2 transitions, respectively with excitation at 350 nm wavelength. Furthermore, the samples of ZrO2:Dy3+ annealing with a controlled N2 showed an increase of 73 and 83% in blue and yellow bands due to decrease of hydroxyl groups (–OH), according to infrared (IR) spectroscopy, which helps to reduce the non-radiative relaxation process. In addition, incorporation Li+ ions up to 0.25 mol% into ZrO2:Dy3+ nanopowders exhibited a further enhancement emission intensity of both bands, owing to this monovalent cation act as coactivator and charge compensator. On the other hand, the color coordinates (x, y) and correlated color temperature (CCT) results suggests that the synthesized nanophosphor can be used as a yellow-orange component for the fabrication of near UV-based w-LEDs.
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