二维单斜相Eu2O3的盐辅助CVD可控合成及其偏振荧光研究

二维单斜相Eu2O3因其优异的偏振荧光性能而在光电领域有着非常重要的应用前景。但由于单斜相Eu2O3形成能高且易发生相转变、非层状的晶体结构特点，使得其合成非常困难，基于二维单斜相Eu2O3的化学气相沉积（CVD）合成一直没有被报道，这也制约了其进一步应用。因此，本项目拟在CVD的过程中引入碱金属卤化物盐来实现二维单斜相Eu2O3的可控合成。通过碱金属卤化物盐与Eu2O3不同晶面的选择性吸附，降低单斜相Eu2O3的形成能，促进单斜相Eu2O3晶面的取向生长，实现单斜相Eu2O3的二维化。结合理论计算揭示盐辅助CVD过程中的形核和生长的微观动力学过程。在此基础上，本项目拟研究二维单斜相Eu2O3的偏振荧光性能及其在信息加密传输上的应用。本项目有望为二维稀土材料的合成和应用提供新的思路。

Two-dimensional (2D) monoclinic Eu2O3 has a very important application prospect in optoelectronic field because of its excellent polarized fluorescence properties. However, it is very difficult to synthesize monoclinic Eu2O3 because of its high formation energy, easy phase transition and non-layered crystal structure. Chemical vapor deposition (CVD) synthesis based on 2D monoclinic Eu2O3 has not been reported. This restricts the further application of 2D monoclinic Eu2O3. Therefore, the project plans to introduce alkali metal halide salts in the CVD process to realize the controllable synthesis of 2D monoclinic Eu2O3. The selective adsorption of alkali metal halide salts on different crystal planes of Eu2O3 can reduce the formation energy of monoclinic phase, promote the oriented growth of monoclinic Eu2O3 crystal planes, and realize the 2D transformation of monoclinic Eu2O3. The microscopic kinetics of nucleation and growth in salt-assisted CVD will be revealed by theoretical calculation. This project intends to study the polarized fluorescence properties of 2D monoclinic Eu2O3 and its application in information encryption transmission. This project is expected to provide a new idea for the synthesis and application of 2D rare earth materials.