Sol-gel derived barium orthovanadate phosphors for white light-emitting diodes

Abstract The self-luminescent Ba3(VO4)2 materials were synthesized by a sol-gel method. The structural and morphological properties of the prepared materials were analyzed by X-ray diffraction (XRD) pattern and scanning electron microscope images. The XRD pattern shows that the sample crystallized in the rhombohedral phase with a space group of R 3 ¯  m (166). The XRD pattern is consistent with the Joint Committee on Powder Diffraction Standards card values without any other impurity peaks. The self-luminescent properties of the samples were investigated by measuring the photoluminescence (PL) excitation and emission spectra by using a spectrofluorometer. The PL spectra revealed that the materials can give visible bluish-green emission under ultraviolet irradiation. The materials were further employed in making near-ultraviolet excitable white light-emitting diodes. The Ba3(VO4)2 phosphor along with a red emitting phosphor was mixed in silicone epoxy and applied to the near-ultraviolet light-emitting diode to obtain a bright white-light emission with a color rendering index of 80 and a correlated color temperature of 4075 K.

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