Crystal structure, luminescent properties and white light emitting diode application of Ba₃GdNa(PO₄)₃F:Eu²⁺ single-phase white light-emitting phosphor

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• 作者：Chenxia Li^a ; Jian Dai^a ; Jun Huang^b ; Degang Deng^b ; ^{dengdegang@cjlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hua Yu^c ; Le Wang^a ; Yutao Ma^a ; Youjie Hua^b ; Shiqing Xu^b ; ^{sxucjlu@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Phosphors ; Single-phase ; White light-emitting diode
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：6891-6898
• 全文大小：2506 K

文摘

A series of single-phase white-light-emitting phosphors, Eu²⁺-activated Ba₃GdNa(PO₄)₃F phosphors were synthesized by solid-state reactions. The crystal structure of Ba₃GdNa(PO₄)₃F was been identified by Rietveld refinement of X-ray diffraction pattern. The Eu²⁺-activated Ba₃GdNa(PO₄)₃F phosphors exhibit broad excitation spectra from 250 to 420 nm, which matched well with the n-UV LED chips. Under the excitation of 365 nm, the emission spectrum almost covered the entire visible region including two emission bands peaked at 472 nm and 640 nm. Three different Eu²⁺ emission centers in Ba₃GdNa(PO₄)₃F:Eu²⁺ phosphor were confirmed by their fluorescence decay lifetimes. The optimal concentration of Eu²⁺ in Ba₃GdNa(PO₄)₃F:xEu²⁺ was 3 mol% and the corresponding concentration quenching mechanism was verified to be exchange coupling interaction. Furthermore, the white light-emitting diode fabricated with Ba₃GdNa(PO₄)₃F:0.05Eu²⁺ phosphor and a 370 nm UV chip has a CIE of (0.3267, 0.2976) with a color-rendering index of 78.4 at the CCT of 5287 K.