Abstract
Rare-earth ions doped inorganic luminescent materials (phosphors) in nanodimensions find widespread scientific and industrial applications. This paper report a novel red-emitting Eu3+ doped Ba3Ca3(PO4)4 phosphors in nanodimensions were synthesized via one-step conventional solid state reaction method for first time at high temperature in air atmosphere. The morphology and nanostructures of synthesized phosphors were determined by powder X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM) and Energy-dispersive X-ray spectroscopy (EDS). The XRD observation reveals that the undoped and Eu3+ doped Ba3Ca3(PO4)4 phosphors are in single crystalline phase with the sizes of 40–65nm. FE-SEM image indicated the phosphor is composed of nearly spherical particles and rod like structures with several nanometer sizes. The presence of orthophosphates in Ba3Ca3(PO4)4 phosphor was identified by Fourier transform infrared (FT-IR) analysis and the thermal stability was studied by Differential scanning calorimetry (DSC). Diffuse reflectance spectra (DRS) evidenced the incorporated Eu3+ ions in host material. In addition, the bandgap of these samples were estimated from the Mubelka–Munk function. The room-temperature photoluminescence spectra show the characteristic red fluorescence originating from intra 4f 5D0→7F2 (616nm) transition of Eu3+ is observed by introducing Eu3+ ions in Ba3Ca3(PO4)4 phosphors. The calculated color coordinates are lies in the orange–red region. Therefore, these obtained results suggest that the prepared phosphors exhibit great potential for use as red-component for near ultraviolet white light emitting diodes (NUV WLEDs).
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