稀土离子在二维层状硒化物基质中的近红外发光特性

稀土离子激活的发光材料已广泛地被应用于光子科学和技术。特别是近红外稀土发光材料，在光纤通信、光电子器件和生物医学等领域正发挥着重要作用。另一方面，为实现制备原子尺度超薄电子和光电子器件，二维半导体材料近年来成为一个非常热门的研究领域。其中，二维硒化物拥有易制备、光电性能优异、化学稳定性好和低声子能量等特点，被广泛研究。遗憾的是还没有工作尝试将发光稀土离子和二维硒化物半导体耦合。本项目将使用二维层状硒化物作基质，研究稀土离子的近红外发光。申请人综合其在稀土发光和二维材料方面的研究经验，通过各种技术，系统地研究所合成材料的结构、光学和发光性能。合理地选择稀土掺杂剂和硒化物基质的层状结构，将使我们能够在新系统中调控发光。因此，本项目所提出的稀土离子掺杂硒化物层状材料在科学和技术上非常有兴趣。引入稀土离子到二维半导体材料为突破其本征窄带发射提供了可信的解决方案，同时也有潜力发展出新型的光子材料。

Rare earth ions activated luminescent materials have extensively been used in photonic science and technology. Particularly, rare earth ions doped luminescent materials with near-infrared emissions have played important roles in optical fibre communication, optoelectronic devices and biomedicine. On the other hand, the ultimate goal of making atomically thin electronic and optoelectronic devices greatly stimulates two-dimensional material research which has recently become a very hot field. Among them, two-dimensional selenides possess easy fabrication, good photoelectric performance, good chemical stability and low phonon energy etc., have been widely studied. Unfortunately, there has been no attempt on the incorporation of luminescent rare earth ions to the two-dimensional selenide semiconductors. In this proposal, near-infrared luminescence of rare earth ions will be studied by using two-dimensional selenide layered materials as hosts. Coupling with the expertise in both rare earth ions doped phosphors and two-dimensional materials, we will systemically investigate structural, optical and luminescent properties of the synthesized materials using various techniques. A proper selection of rare earth dopants and layered structures of host lattices will enable us to tune emission of the novel system. Therefore, the proposed rare earth ions doped layered selenide semiconductors are scientifically and technologically very interesting. The introduction of rare earth ions into two-dimensional selenide materials can provide a compelling solution to overcome the obstacle of narrow emission restricted by the intrinsic properties of pristine selenide semiconductors, which can offer a distinct class of photonic materials with great technological potential.