Preparation, structure and luminescence properties of deep red phosphors SrSiN₂:Eu²⁺

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• 作者：Lei CHEN ((陈 磊)) ; Ronghui LIU ((刘荣辉)) ; ^{griremlrh@126.com" class="auth_mail" title="E-mail the corresponding author} ; Weidong ZHUANG ((庄卫东)) ; ^{wdzhuang@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yuanhong LIU ((刘元红)) ; Yunshen HU ((胡运生)) ; Xiaole MA ((马小乐)) ; Bing HU ((胡 斌))
• 关键词：red phosphors ; nitride ; quantum efficiency ; Sr2Si5N8 ; structure ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：34
• 期：1
• 页码：30-35
• 全文大小：974 K

文摘

This paper reported a novel synthetic route to Eu²⁺ doped SrSiN₂ deep red phosphors for white light-emitting diodes. A series of single-phased and high-efficiency SrSiN₂:Eu²⁺ red phosphors were synthesized based on this method. Their structure, morphology, luminescence, quantum efficiency (QE) and thermal quenching properties were investigated and compared with those of SrSiN₂: Eu²⁺ prepared by the conventional route. It was found that the addition of a small amount of Si₃N₄ could promote the formation of SrSiN₂ from Sr₂Si₅N₈ phase. A highly uniform rod-shaped morphology was obtained based on this method. The X-ray powder diffraction and the Rietveld refinement analysis identified the preferential crystalline orientation growth. Under the blue light excitation, Eu²⁺ doped SrSiN₂ phosphors showed excellent optical properties. Compared with those prepared by the conventional approaches, the external QE of SrSiN₂:Eu²⁺ phosphor was greatly improved, allowing it a promising phosphor for white LEDs.