Color-tunable phosphor of Sr(3)YNa(PO(4))(3)F:Tb(3+) via interionic cross-relaxation energy transfer.
Color-tunable phosphor of Sr(3)YNa(PO(4))(3)F:Tb(3+) via interionic cross-relaxation energy transfer.
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通过离子间交叉弛豫能量转移的 Sr3YNa(PO4)(3)F:Tb(3 ) 颜色可调荧光粉
DOI：
10.1039/c8ra05515g
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发表时间：
2018-07-16
期刊：
影响因子：
3.9
通讯作者：
Chen, Baojiu
中科院分区：
文献类型：
--
作者：
Zhang, Bingye;Ying, Shitian;Han, Lu;Zhang, Jinsu;Chen, Baojiu
采用传统的高温固相反应法合成了一系列具有氟磷灰石结构的可调色荧光粉Sr3YNa(PO4)3F：Tb3+。通过逐渐增加Tb3+离子浓度，可以观察到发光颜色从蓝色到绿色的调谐，这归因于Tb3+离子之间交叉弛豫(CR)的增强，如(5D3，7F6)-(5D4，7F0)所描述的。基于Dexter模型和Inokuti-Hirayama模型分析了CR过程，并将其归结为电偶极-偶极相互作用。Tb~(3+)离子间的能量转移临界距离为18.1ó。此外，还研究了Sr3YNa(PO4)3F：Tb3+的热猝灭机理。在LED的一般工作温度(423K)下，当Tb3+浓度分别为10%和30%时，发光强度仍保持81%和92%，表明Tb3+具有良好的热猝灭性能。由于具有良好的光学和热学性能，Sr3YNa(PO4)3F：Tb3+荧光粉有望作为一种绿色发光材料应用于白光领域。通过交叉弛豫能量传递获得了具有良好热稳定性的可调色荧光粉。
A series of color-tunable Sr3YNa(PO4)3F:Tb3+ phosphors with a fluorapatite structure were synthesized by a traditional high-temperature solid state reaction. The emitting color tuning from blue to green can be observed by gradually increasing Tb3+ concentrations, which is attributed to the enhanced cross-relaxation (CR) between Tb3+ ions, as described by (5D3, 7F6)–(5D4, 7F0). The CR process is analyzed based on the Dexter and Inokuti–Hirayama model, which is assigned to the electric dipole–dipole interaction. The energy transfer critical distance between Tb3+ ions is evaluated to be 18.1 Å. In addition, the thermal quenching mechanism of Sr3YNa(PO4)3F:Tb3+ is also investigated. At the general working temperature of an LED (423 K), the luminescence intensity still maintains 81% and 92% with the Tb3+ concentration of 10 and 30 mol%, respectively, indicating an excellent thermal quenching performance of Tb3+. Due to the good optical and thermal properties, the Sr3YNa(PO4)3F:Tb3+ phosphor can be used as a promising green emitting phosphor candidate in the field of white light applications. Color-tunable Sr3YNa(PO4)3F:Tb3+ phosphors were obtained via cross-relaxation energy transfer, and exhibit superior thermal stability.
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