Luminescence properties of a new greenish blue emitting phosphor Na₅Ca₄(PO₄)₄F:Eu²⁺

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• 作者：Haiyi Xiao ; Zhiguo Xia ; ^{xiazg426@yahoo.com.cn} ; Libing Liao ; ^{lbliao@cugb.edu.cn} ; Jun Zhou ; Jiaqing Zhuang
• 关键词：Optical properties ; Luminescence ; Halophosphate phosphors
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 September, 2012
• 卷：534
• 期：Complete
• 页码：97-100
• 文件大小：641 K

摘要

A novel greenish blue emitting phosphor, Na₅Ca₄(PO₄)₄F:Eu²⁺, was synthesized by a conventional solid-state reaction, and its phase formation was confirmed by using the X-ray powder diffraction (XRD) technique. The photoluminescence (PL) results showed that the phosphor could be efficiently excited by ultraviolet (UV) light at wavelength of 250-410 nm, and it exhibited bright greenish blue emission under 365 nm UV light. The emission spectrum showed a single broad band centered at 500 nm, corresponding to the 4f⁶5d¹ 鈫?#xA0;4f⁷ transition of Eu²⁺. Eu²⁺ concentration dependent PL properties in Na₅Ca₄(PO₄)₄F:xEu²⁺ indicated that there was a dipole-dipole interaction of Eu²⁺ ions. The critical energy-transfer distance was around 19.8 脜. Furthermore, this phosphor had good thermal stability and its thermal quenching activation energy was 0.45 eV. The measured quantum efficiency of Na₅Ca₄(PO₄)₄F:0.01Eu²⁺ phosphor under 365 nm excitation is 76%, which means that the present phosphor is promising in the white light emitting diodes (LEDs) phosphors.