Blue photoluminescence and long lasting phosphorescence properties of a novel chloride phosphate phosphor: Sr₅(PO₄)₃Cl:Eu²⁺

详细信息    查看全文

• 作者：Chuanqiang Wu ; Jiachi Zhang ; Pengfei Feng ; Yiming Duan ; Zhiya Zhang ; Yuhua Wang
• 关键词：Luminescence ; Optical materials ; Optical properties
• 刊名：Journal of Luminescence
• 出版年：March, 2014
• 年：2014
• 卷：147
• 期：Complete
• 页码：229-234
• 全文大小：2051 K

文摘

A novel blue emitting long lasting phosphorescence phosphor Sr₅(PO₄)₃Cl:Eu²⁺ is synthesized by solid state method at 1223 K in reducing atmosphere. The afterglow emission spectrum shows one broad band centered at 441 nm due to the 5d-4f transition of Eu²⁺ at six coordinated Sr(II) sites and the color coordinates are calculated to be (0.149, 0.095) which is close to the light blue region. The excitation band is in 240-430 nm and partly overlaps the solar irradiation on Earth's surface. The long lasting phosphorescence of the optimal sample doping by 0.1 mol%Eu²⁺ can be recorded for about 1040 s (0.32 mcd/m²). Thermoluminescence shows that there are at least three types of traps corresponding to peaks at 340 K, 382 K, 500 K, respectively. The filling and fading experiments reveal that the traps in Sr₅(PO₄)₃Cl:Eu²⁺ are independent. The shallow traps (340 K) essentially contribute to the visible long lasting phosphorescence, while the deep traps (382 K and 500 K) are proved to be very stable. Thus, the Sr₅(PO₄)₃Cl:Eu²⁺ material shows potential applications as not only a long lasting phosphorescence phosphor, but also an optical storage material.