Role of flux in the production process of red phosphors for white LEDs
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Eu3+-doped potassium tungstate phosphor was synthesized by solid-state reactions. The as-produced phosphor was re-fired with a small amount of flux-like alkali carbonates and boron oxide. It was confirmed that the re-firing process containing a flux led to the uniform particle growth with smooth surface and improved Eu3+ distribution at the surface of particles, resulting in the enhanced red emission. The X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) analyses were used to determine the role of flux in the system.
KeywordsEmission Intensity B2O3 Luminescence Property Boron Oxide Surface Segregation
This research was partially sponsored by the Samsung Electro-Mechanics Co. and by BK21 program of the ministry of Education, Republic of Korea (2005).
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