新型单基质白光荧光粉Sr_3La_(1-x)(PO_4)_3:xDy^(3+)制备及发光性能

Preparation and Luminescence Properties of Novel Single Host Sr_3La_(1-x)(PO_4)_3:xDy^(3+) White-Emitting Phosphor

采用高温固相法合成了Sr3La1-x(PO4)3:xDy3+荧光粉,并对其结构和发光特性进行了研究。样品发射光谱呈多峰发射,主峰位于482,576和666 nm,分别对应Dy3+的4F9/2→6H15/2,4F9/2→6H13/2和4F9/2→6H11/2特征跃迁。监测不同发射峰,激发光谱峰位置不变,主激发峰位于348,362和385 nm,可以被InGaN管芯有效激发。分析了Dy3+掺杂浓度对样品发光强度的影响,确定Dy3+的最佳掺杂摩尔分数为10%。根据Dexter理论分析其浓度猝灭机理为电偶极-电偶极相互作用。不同Dy3+掺杂浓度样品发射光谱的色坐标均在白光区域内。

The Sr3 La1 -x （ PO4 ）3 ：xDy3＋ phosphor was synthesized by high temperature solid state reaction, and its structure and luminescence properties were also investigated. The emission spectra of Sr3 La （ PO4 ） 3 ： Dy3＋ showed that the peaks located at 482, 576 and 666 nm, corresponding to the 4F9/2→6H15/2, 4F9/2→6H13/2 and 4F9/2→6H11/2 typical transition of Dy3＋ , re- spectively. It was found that the location of excitation spectra was invariable when different emission peaks were monitored. And the main exeitation peaks were located at 348, 362 and 385 nm, which could be ex- cited by InGaN chip effectively. The influence of dif- ferent concentration of Dy3＋ ions on the emission in- tensity was also analyzed. It showed that the optimum doped-Dy3＋ mole fraction was 10%. The concentra- tion quenching mechanism is the electric dipole-elec- tric dipole interaction by Dexter theory. Finally, the chromaticity coordinates of the emission spectra of the samples with different concentrations of Dy3＋ were measured, which were all in the white region.