Facile Synthesis of (Sr,Ca)2Si5N8:Eu2+-Based Red-Emitting Phosphor for Solid-State Lighting

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• 作者：Takayuki Suehiro ; Rong-Jun Xie ; Naoto Hirosaki
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：June 5, 2013
• 年：2013
• 卷：52
• 期：22
• 页码：7453-7456
• 全文大小：253K
• 年卷期：v.52,no.22(June 5, 2013)
• ISSN：1520-5045

文摘

A new facile synthetic route to produce a nitride-based red-emitting phosphor has been established. The (Sr,Ca)₂Si₅N₈:Eu²⁺-based multicomponent phosphor was successfully synthesized from the stable SrCO₃鈥揅aCO₃鈥揈u₂O₃鈥揝i₃N₄ system by simple one-step heating at 1600 掳C for 4 h in an unpressurized N₂ atmosphere. The synthesized (Sr,Ca)₂Si₅N₈:Eu²⁺-based red broadband emitting phosphor exhibited the peak wavelength as long as 661 nm with a practically high external quantum efficiency of 60% under the excitation at 450 nm, while the coexisting secondary phase was inactive under the blue-light excitation, showing no detrimental effects on the photoluminescent properties. The enhanced red emission compared to the unmodified Sr₂Si₅N₈:Eu²⁺ phosphor enables further improvement of the color rendering properties of the white light-emitting diodes for solid-state lighting applications.