Efficient and thermally stable red luminescence from nano-sized phosphor of Gd6MoO12:Eu3+
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A novel red-emitting nano-phosphor of Eu3+-doped Gd6MoO12 was successfully synthesized by the Pechini method. The crystalline phase was confirmed by X-ray powder diffraction analysis. The morphology of the nano-phosphor was analyzed by scanning electron microscopy, indicating a good crystallization with particles smaller than 500 nm. The luminescence properties such as photoluminescence spectra and decay curves were investigated. The phosphors can be efficiently excited by near-ultraviolet (near-UV) light and exhibit a bright red luminescence around 613 nm ascribed to the forced electric dipole transition 5D0→7F2 of Eu3+ ions. The thermal stabilities were investigated from the temperature-dependent luminescence decay curves (lifetimes) and spectra intensities. The luminescence properties in relation to applications in white light-emitting diodes (W-LEDs) such as the absolute luminescence quantum efficiency, excitation wavelength, and color coordinates were discussed. The Gd6MoO12:Eu3+ nano-phosphor is a promising red-emitting candidate for the fabrication of W-LEDs with near-UV chips.
KeywordsNano-particles Molybdate Phosphor Luminescence
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2013-R1A1A2009154) and by A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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