Abstract
Trivalent dysprosium (Dy3+) activated nanocrystalline yttrium vanadate (YVO4) phosphor was synthesized via co-precipitation method. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), optical absorption and photoluminescence (PL) techniques. The XRD patterns reveal the tetragonal crystalline phase. SEM images reveal that Dy doped YVO4 nanocrystals are agglomerated. EDAX confirms the formation of YVO4:Dy. FTIR spectrum shows two strong absorption bands at 459 and 761 cm−1. Optical absorption spectrum showed the surface defects in the as-prepared samples. The PL emission spectrum shows two characteristic emission bands at 485 and 575 nm. The strong yellow emission peak at 575 nm is assigned to 4F9/2 → 6H13/2 hyper sensitive transition of Dy3+ ions. Study of CIE chromaticity diagram indicates the suitability of the phosphor for the development of yellow-green LEDs.
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