廉价金属锰(II)配合物磷光材料的设计、制备及其在有机电致发光中的应用

Organic electroluminescence is considered as the most promising alternative in future display and lighting applications owing to its self-luminescence, low power consumption, etc. Up to date, high-performance phosphorescent organic light-emitting devices are mainly achieved by incorporating the noble metal-based phosphors including iridium(III) and platinum(II) complexes, which are often suffering from the low abundance, high cost and potential risks in environmental pollution caused by the heavy metal atoms. Thus, the utilization of relatively abundant, low-cost, and environmental-friendly phosphorescent manganese(II) complexes could be the solution to this problem. In contrast to the above-mentioned noble metal-based phosphors with the well-established structure-property relationships, the explorations of phosphorescent manganese(II) complexes is just getting started, only few examples of manganese(II) complexes are reported so far. Especially, there is still a lack of deep understanding of structure-property relationships and optoelectronic properties. In this project, we plan to develop a series of high-performance phosphorescent manganese(II) complexes to establish the structure-optoelectronic property relationships. The efficiency of energy transfer between the ligands and the manganese(II) ions can be regulated by tuning and optimizing the structure of ligands. On this basis, carrier transport unit can be introduced into the ligands to realize the highly efficient phosphorescent manganese(II) complexes with bipolar transporting properties for high-performance organic electroluminescence. This project will establish foundation to further explore the highly efficient phosphorescent manganese(II) complexes with bipolar transporting properties, and will also provide new ideas for realizing high-performance organic electroluminescence by using the cheap metal-based phosphors.

有机电致发光因具有自发光、能耗低等优势，在照明、显示等领域极具前景。目前高性能有机电致磷光器件主要依赖铱/铂等贵金属磷光材料，不仅资源稀少、价格昂贵，且会污染环境，使用环境友好的廉价过渡金属锰(II)配合物磷光材料是解决该问题的有效途径之一。与构效关系较为清楚的铱/铂等贵金属配合物相比，磷光过渡金属锰(II)配合物的研究刚刚起步，不仅材料体系亟待丰富，对其构效关系和光电性质仍缺乏深层次的认识。本项目以“构建高性能过渡金属锰(II)配合物磷光材料”为核心，以“阐明其结构-光电性质之间的内在关系”为目标，通过配体结构调控与优化，调节配体与锰(II)离子间的能量传递效率，并引入载流子传输单元，制备双极传输特性的高效磷光锰(II)配合物材料，实现高性能有机电致发光。项目将为探索具备双极传输特性的高效锰(II)配合物磷光材料奠定基础，为廉价金属磷光材料实现高性能有机电致发光提供新思路。

使用环境友好的廉价磷光锰(II)配合物材料是实现低成本磷光材料的有效途径之一，开展磷光锰(II)配合物材料的研究在基础研究和应用领域具有重要意义。本项目以“设计、合成一系列磷光锰(II)配合物材料”为核心，以“发展新型磷光锰(II)配合物材料并实现其电致发光与X-射线成像应用”为目标，聚焦构效关系研究，并取得了一系列成果。例如, 基于刚性双齿磷氧配体的磷光锰(II)配合物的分子设计、合成、晶体结构及其光物理性质；基于二苯胺和咔唑的双极性磷氧配体的磷光锰(II)配合物的分子设计、合成及其光物理性质；基于螺环季铵阳离子的离子型磷光锰(II)配合物的分子设计、合成及其光物理性质；此外，基于新型磷光锰(II)配合物的分子结构设计理念，进一步拓展了新型磷光锰(II)配合物的应用范围。通过本项目的实施，无论从新型磷光锰(II)配合物的构筑还是激发态调控来说，都取得了一系列研究成果。该项目按预期计划执行，经费使用合理。在该项目的支持下，培养了2名硕士研究生，并取得了一系列研究成果。在国内外学术期刊发表学术论文17篇，出版专著章节1章。