Photoluminescence Properties of Eu²⁺ Activated CaAlSiN₃ Red Phosphors with Various Eu²⁺ Contents

Abstract:

A combustion synthesis method has been developed for synthesis of Eu²⁺ doped CaAlSiN₃ phosphor and its photoluminescence properties were investigated. Ca, Al, Si, and Eu₂O₃ powders were used as the Ca, Al, Si and Eu sources. NaN₃ is added as the nitrogen source in the interior part of reactants and also as a reducing agent. While NH₄Cl is added for catalysis of the synthesis reaction. These powders were mixed and pressed into a compact which was then wrapped up with an igniting agent (i.e.,Mg+Fe₃O₄). The compact was ignited by electrical heating under a N₂ pressure of 0.2-1.0MPa. Effects of these experimental parameters on the photoluminescence properties and product yield were investigated. The synthesized CaAlSiN₃:Eu²⁺ phosphor absorbs light in the region of 200-600 nm and shows a broad band emission in the region of 500-800 nm due to the 4f⁶5d¹→4f⁷ transition of Eu²⁺. The peak emission intensity is ~106 % of a commercially available phosphor, YAG:Ce³⁺(P46-Y3), and the peak emission wavelength ranges from 610 to 680 nm depending on the Eu²⁺ concentration upon excitation at 460nm.The synthesized phosphor also shows excellent thermal and chemical stability and thus has a potential application as a red phosphor for white LED lighting.

• Periodical: Applied Mechanics and Materials (Volumes 764-765)
• Pages: 1255-1259
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.764-765.1255
• Online since: May 2015
• Authors: Shyan Lung Chung*, Shu Chi Huang
• Keywords: Combustion Synthesis, LED Lighting, Nitride Phosphor, SHS

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