Synthesis and Luminescence Properties of a Red Nitride Phosphor (CaAlSiN₃:Eu²⁺) for White Light LED Applications

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 was added as both solid-state nitrogen source and reducing agent and NH₄Cl was added as catalytic agent. These powders were mixed and pressed into a compact which was then wrapped up with an igniting agent (Mg+Fe₃O₄). The wrapped reactant compact was ignited by electrical heating under a N₂ pressure of 0.2-1.0 MPa. Effects of experimental parameters on product yield and photoluminescence properties 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: Advances in Science and Technology (Volume 88)
• Pages: 104-110
• DOI: https://doi.org/10.4028/www.scientific.net/AST.88.104
• Online since: October 2014
• Authors: Shyan Lung Chung*, Shu Chi Huang
• Keywords: CaAlSiN₃:Eu²⁺, Combustion Synthesis, LED Lighting, Nitride Phosphor

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