稀土金属铒掺杂的硅纳米晶体在胆固醇液晶中的激光研究

项目名称： 稀土金属铒掺杂的硅纳米晶体在胆固醇液晶中的激光研究

项目编号： No.61275141

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 黄玉华

作者单位： 浙江师范大学

项目金额： 92万元

中文摘要： 本项目针对目前采用激光染料掺杂于胆固醇液晶中产生的激光效率低，稳定性差，使用寿命短等问题，拟采用发光效率高且光化稳定性好的铒掺杂纳米晶体取代激光染料作为胆固醇液晶激光的发光介质来解决这些问题，其中铒掺杂纳米晶体采用溶胶凝胶法来制备。同时由于液晶的双折射率和粘稠系数也会影响胆固醇液晶激光的效率和稳定性，且双折射率和粘稠系数越高，得到的激光效率和稳定也越高。本项目拟采用具有苯环的高共轭集团作为单元并延长它的共轭长度来提高液晶的霜折射率和粘稠系数同时保证其光化稳定性。希望通过本项目的顺利实施，能将胆固醇液晶激光效率提高到>40%,，并大大提高其光化稳定性和使用寿命，为基于胆固醇液晶的微型激光的应用奠定实验基础。

中文关键词： 微型激光；胆固醇液晶；纳米晶体；激光效率；稳定性

英文摘要： In order to overcome the shortcoming of the dye doped cholesteric liquid crystal laser, that is low efficiency, unstable, and short lifetime, we will replace the laser dye with erbium doped silicon nancrystal, which exhibits high quantum fluorescnece efficiency and photo stability. In addition, the physical and optical properties of liquid crystals also affect the performance of the cholesteric liquid crystal based lasers, usually liquid crystals with higher birefringence and viscosity can produce higher laser efficiency and more stable the cholesteric liquid crystal based lasers. Therefore, in this project, we propose to develop high birefringent liquid crystal with high viscosity and photo stability by using high conjugate compents, such as benzen ring. Hopefully,with the use of erbium doped silicon nanocrystal and high birefringent and viscosity liquid crystal, the laser efficiency, stability and lifetime of the cholesteric liquid crystal based laser can be greatly enhanced. We expect that the laser efficiency of the cholesteric liquid crystal based laser can be enhanced to >40%, which will establish the experimental foundation for the practical applications of cholesteric liquid crystal based microlasers.

英文关键词： Mirco laser；cholestric liquid crystal；nano crystal；laser efficiency；stability