Mn(IV)激活氟硅(锗)酸盐红色荧光粉晶面与发光性质依赖性研究

The rapid development of LED lighting devices promotes the research process of the red phosphors. The most works focused on the synthesis methods. However, the difference in the luminescent properties caused by crystal face is rarely concerned. This project proposes to optimize the luminescent properties of luminescence material through the crystal faces based on the structure differences of crystal faces in crystal materials. The converting precipitation method as basic synthesis method with the assistance of mediation component, seed-mediated, dynamics controlling, surface energy regulation methods will be used to obtain fluosilicate (germanate) phosphors with specific crystal face exposed. The relativities between synthesis method and phase structure, micro-defect/the exposed crystal surface and the luminescent properties will be explored. Through the component design combining with the theoretical calculations, the regularity in the luminescent properties affected by the crystal structure of fluosilicate (germanate), micro-defect, controlled crystal face growth will be found, and the physical mechanism to improve the luminescent properties will be explored. It will reveal the evolution reasons of the luminescent properties of fluosilicate (germanate) with specific crystal face exposed. The principles of component design and controlling crystal faces of the luminescent properties of fluosilicate (germanate) will be found, and the preparation technologies of fluosilicate exposing different faces will be obtained. The microscopic regulation in the luminescent properties of fluosilicate will be realized, thus to improve the illuminating effect of white LED by supplying the optional fluosilicate-based phosphors.

LED照明器件的迅速发展大力推动了红色发光材料的研究进程，但与暴露晶面相关的发光性质的研究则较少关注。本项目基于晶体材料晶面结构的差异性，提出通过研究不同晶面结构的发光性质优化发光材料性能的思路。拟以沉淀转化法为基本合成方法，辅助以组分调整法、晶种法、动力学控制法、表面能调控法等手段获得暴露特定晶面氟硅(锗)酸盐发光材料，研究各种制备方法与相结构、微观缺陷和暴露晶面与性能的关联性。结合理论计算发现影响氟硅(锗)酸盐晶体结构、微观缺陷、控制晶面生长与发光性能变化的因素，探索提高氟硅(锗)酸盐发光性能的物理机制，揭示暴露特定晶面氟硅(锗)酸盐发光性质演化的缘由，提出氟硅(锗)酸盐发光材料的组成设计和晶面控制原则，建立获得暴露不同晶面氟硅(锗)酸盐的制备技术，实现氟硅(锗)酸盐发光材料性能的微观调控，为改善白光LED照明效果提供新型氟硅(锗)酸盐发光材料。

结构、组成和晶面调控是优化发光材料的关键之一。本项目基于晶面、组成、结构等晶体材料结晶性控制因素，研究了对氟化物、氟氧化物、氮（氧）化物等的发光性质。采用多种方法合成了系列Mn4+激活荧光粉，如K3NbOF6:Mn4+、K3TaOF6:Mn4+、K2NaGaF6:Mn4+、BaNbF7:Mn4+、K2SiF6:Mn4+、K2TiF6:Mn4+等，系统地调节荧光粉颗粒的形貌从立方体向八面体、六棱柱向六边形片的转变，讨论了不同暴露晶面与发光性质间的关系，提出高对称性晶面有助于提高发光强度的根源在于高面网密度。.制备了宽带发射近红外荧光粉Mg3Ga2GeO8:Cr3+，双功能近红外荧光粉了LaMgGa11O19:Cr3+和近红外二区宽带发射荧光粉Zn1+ySnyGa2−2yO4: Cr3+-Ni2+, 实现了谱带位置和发光强度的协同调控，研究了其中的能量传递过程, 并探索了其在检测蔬菜、水果的新鲜度和生物组织成像等方面的应用。.研究了Ca2Si5N8中两种Ca原子格位的中激活剂能量传递机制，实现了Ca2Si5N8: Ce3+,Na+, Eu2+荧光粉的蓝光-白光-橙红光的颜色可调。合成了新型窄带蓝光发射氮化物荧光粉Sr8Mg7Si9N22:Eu2+和黄色荧光粉Sr8Mg7Si9N22:Ce3+，研究了骨架结构与发光性质间的关系。.研究了多孔结构Ni2P纳米片、FeP-CoMoP纳米阵列、V-MoS2、CoP纳米棒阵列、CoMoP纳米管阵列以及FeP-CoMoP分级纳米结构的高效电催化水分解性能，发现受晶格差异影响的张力效应在实现优异析氢性能的过程中扮演着至关重要的作用。提出依据“收缩-收缩”原理，制备了可应用于高倍率超级电容器的电极和电磁干扰屏蔽的柔性多孔材料的高交联导电纳米纤维薄膜。.该项目的完成对于改善白光LEDs器件性能，发展新型发光材料，实现发光材料制备的技术进步和推动固体化学研究有积极的作用。