论文部分内容阅读
采用高温固相法合成了Li+、Na+、K+和Si4+作为电荷补偿剂的Ca2.96Eu0.04(PO4)2白光LED用红色荧光粉。采用X射线衍射仪、荧光光谱仪对材料的物相和发光性能进行了表征。样品的激发光谱由200~310 nm的电荷迁移带和310~500 nm的锐线光谱组成,其中396 nm的激发强度最大。发射光谱主要由5D0→7F1(593 nm)和5D0→7F2(616 nm)跃迁导致的发射峰构成。掺入Li+、Na+、K+和Si4+可以有效提高Ca2.96Eu0.04(PO4)2荧光粉的发光强度,同时对荧光粉的寿命和色坐标影响不大。荧光粉的色坐标均位于红色区域。
High-temperature solid-state synthesis of Li +, Na +, K + and Si4 + as a charge compensation agent Ca2.96Eu0.04 (PO4) 2 white LED red phosphor. The phase and luminescent properties of the materials were characterized by X-ray diffraction and fluorescence spectroscopy. The excitation spectrum of the sample consists of a charge transfer band of 200-310 nm and a sharp line spectrum of 310-500 nm, of which the excitation intensity at 396 nm is the largest. The emission spectrum is mainly composed of emission peaks caused by 5D0 → 7F1 (593 nm) and 5D0 → 7F2 (616 nm) transitions. Incorporation of Li +, Na +, K + and Si4 + can effectively improve the luminescent intensity of Ca2.96Eu0.04 (PO4) 2 phosphors, and has little effect on the lifetime and color coordinates of the phosphors. The phosphor’s color coordinates are in the red area.