多孔超声力致发光材料CaZnOS:Mn2+, Nd3+的设计及其发光机制研究

超声发光检测结合了超声检测与光学成像二者的优势，具有灵敏度高、检测结果直观形象化等优点成为国际无损检测研究的热点。但作为一种新的检测手段其发展仍处于初级阶段，缺少高效率超声发光材料成了制约超声发光检测进一步发展的障碍。项目拟以CaZnOS: Mn2+, Nd3+力致发光材料为模型，通过离子置换来调控基质带隙宽度，研究其能级结构与超声力致发光最小激发阈值之间的响应关系；通过发光中心离子的调变来研究能量传递机制；合成具有不同孔道和空心结构的CaZnOS: Mn2+, Nd3+，研究孔结构及颗粒内腔对超声力致发光性能的影响机制，进而揭示超声力致发光原理；通过表面联接弹性高分子研究其对超声波传导效率的影响，旨在揭示三维高分子膜结构对超声波转化为光能的影响机制，实现高效率的超声力致发光材料。研究结果可为高效超声力致发光材料的设计合成、参数选择及超声发光机理的研究等提供理论依据。

Due to the combination of advantages of ultrasonic detection and optical imaging, ultrasonic luminescence detection has possessed high sensitivity and visualization, which thus have attracted more attentions in non-destructive detection region. However, as a novel luminescent phenomenon, the development of ultrasonic induced luminescent materials still located at primary stage. The lack of high efficiency ultrasonic induced luminescent materials has limited the further development of ultrasonic luminescence detection. Thus, in this project, mechanoluminescent (ML) materials CaZnOS: Mn2+, Nd3+ would be chosen as model to develop high efficiency ultrasonic induced mechanoluminescent phsosphors (UML). The band gap of CaZnOS would be adjusted via the ions substitution in the host crystal lattices. And the response mechanism between the band structure and the UML threshold would be investigated in detail. Then the concentration ratio of co-doping Mn2+/Nd3+ would be adjusted to realize the energy transfer process and the ultrasonic luminescence principle would also be investigated. Further, the porous or hollow structured CaZnOS: Mn2+, Nd3+ would be prepared in this project. The effect mechanism of pore or hollow structure on UML would be investigated detailed and their UML mechanism would be revealed. Furthermore, the resins with different elasticity would be modified on the surface of the porous UML phosphors and the effect of surface resins on UML would be investigated in order to reveal the effect of three-dimensional resin structure on the conversion efficiency of ultrasonic energy to photons. Then, under the guidance of the UML mechanism, the more UML materials with high efficiency would be designed. The results of this project would provide many helps to understand the UML mechanism of porous materials and design more various UML materials with high sensitivity.