Zhang Bingye, Ying Shitian, Han Lu, Zhang Jinsu, Chen Baojiu
Department of Physics, Dalian University of Technology Dalian Liaoning 116024 P. R. China
Department of Physics, Dalian Maritime University Dalian Liaoning 116026 P. R. China
RSC Adv. 2018 Jul 16;8(45):25378-25386. doi: 10.1039/c8ra05515g.
A series of color-tunable SrYNa(PO)F:Tb 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 Tb concentrations, which is attributed to the enhanced cross-relaxation (CR) between Tb ions, as described by (D, F)-(D, F). 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 Tb ions is evaluated to be 18.1 Å. In addition, the thermal quenching mechanism of SrYNa(PO)F:Tb is also investigated. At the general working temperature of an LED (423 K), the luminescence intensity still maintains 81% and 92% with the Tb concentration of 10 and 30 mol%, respectively, indicating an excellent thermal quenching performance of Tb. Due to the good optical and thermal properties, the SrYNa(PO)F:Tb phosphor can be used as a promising green emitting phosphor candidate in the field of white light applications.
通过传统的高温固态反应合成了一系列具有氟磷灰石结构的颜色可调 SrYNa(PO)F:Tb 荧光粉。通过逐渐增加 Tb 浓度，可以观察到发射颜色从蓝色到绿色的变化，这归因于 Tb 离子之间增强的交叉弛豫 (CR)，如 (D,F)-(D,F) 所述。基于 Dexter 和 Inokuti-Hirayama 模型分析了 CR 过程，该过程归因于电偶极-偶极相互作用。评估得出 Tb 离子之间的能量转移临界距离为 18.1 Å。此外，还研究了 SrYNa(PO)F:Tb 的热猝灭机制。在 LED 的一般工作温度 (423 K)下，当 Tb 浓度分别为 10 和 30 mol% 时，发光强度仍分别保持 81% 和 92%，表明 Tb 具有优异的热猝灭性能。由于具有良好的光学和热性能，SrYNa(PO)F:Tb 荧光粉可作为白光应用领域中有前景的绿色发光荧光粉候选材料。
