Synthesis and Luminescence Properties of Novel Ce3+- and Eu2+-Doped Lanthanum Bromothiosilicate La3Br(SiS4)2 Phosphors for White LEDs

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• 作者：Szu-Ping Lee ; Shuang-De Liu ; Ting-Shan Chan ; Teng-Ming Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：8
• 期：14
• 页码：9218-9223
• 全文大小：455K
• 年卷期：0
• ISSN：1944-8252

文摘

Novel Ce³⁺- and Eu²⁺-doped lanthanum bromothiosilicate La₃Br(SiS₄)₂:Ce³⁺and La₃Br(SiS₄)₂:Eu²⁺ phosphors were prepared by solid-state reaction in an evacuated and sealed quartz glass ampule. The La₃Br(SiS₄)₂:Ce³⁺ phosphor generates a cyan emission upon excitation at 375 nm, whereas the La₃Br(SiS₄)₂:Eu²⁺ phosphor could be excited with extremely broad range from UV to blue region (300 to 600 nm) and generates a reddish-orange broadband emission centered at 640 nm. In addition, thermal luminescence properties of La₃Br(SiS₄)₂:Ce³⁺and La₃Br(SiS₄)₂:Eu²⁺ phosphors from 20 to 200 °C were investigated. The combination of a 450 nm blue InGaN-based LED chip with the red-emitting La₃Br(SiS₄)₂:Eu²⁺ phosphor, and green-emitting BOSE:Eu²⁺ commercial phosphor produced a warm-white light with the CRI value of ∼95 and the CCT of 5,120 K. Overall, these results show that the prepared phosphors may have potential applications in pc-WLED.