论文部分内容阅读
用溶胶-凝胶法合成白光LED用K2Zn Si O4:Sm3+橙红色荧光粉,研究了样品结构及发光性能。X射线衍射分析表明,微量Sm3+掺杂的样品主晶相为正交晶系结构的K2Zn Si O4。该荧光粉能被近紫外光有效激发,在403 nm激发下,发射光谱由4个发射峰组成,最强峰位于605 nm处,是由Sm3+的4G5/2→6H7/2跃迁引起的。增大Sm3+掺杂量,发光强度先增大后减小,Sm3+最佳掺杂摩尔分数为7%。随着Sm3+掺杂量的增加,样品的色坐标基本不变,位于橙红光区。
Synthesis of White LED by Sol - Gel Method K2Zn Si O4: Sm3 + orange - red phosphor was used to study the structure and luminescence properties of the samples. X-ray diffraction analysis shows that the main crystalline phase of the Sm3 + -doped sample is orthorhombic K2ZnSiO4. The phosphor can be effectively excited by near ultraviolet light. Under the excitation of 403 nm, the emission spectrum consists of 4 emission peaks with the strongest peak at 605 nm, which is caused by the transition of 4G5 / 2 → 6H7 / 2 of Sm3 +. When the content of Sm3 + doping is increased, the luminescence intensity first increases and then decreases, and the optimal doping mole fraction of Sm3 + is 7%. With the increase of Sm3 + doping amount, the color coordinate of the sample is basically unchanged, located in the orange-red region.