Ag纳米颗粒有机薄膜受激辐射增强研究

摘要

To further reduce the lasing threshold of organic semiconductor materials, the surface plasmon resonance effect of silver nanoparticles was investigated.The prepared silver nanoparticle solution was spin-coated on glass substrate, and then PS:Alq3:DCJTB organic thin film was spin-coated on the surface of Ag nanoparticles, and thus formed a planar waveguide.Pumped by YAG (λ = 355nm) laser, the stimulated emission results show that compared with the case without Ag nanoparticles, the Ag-nanoparticle-enhanced edge stimulated emission increases 10.38-fold and its lasing threshold reduces to 0.5 mJ/cm2 from 2.0 mJ/cm2.The vertical surface stimulated emission increases 6.13-fold and its lasing threshold reduces to about 1.5 m J/cm2 from 2.5 mJ/cm2.This work may be of great significance in the realization of low-threshold organic semiconductor lasers.%为进一步降低有机半导体材料的激射阈值,文章研究利用银纳米颗粒的表面等离子体共振效应来实现对有机半导体薄膜受激辐射的增强.将制备好的Ag纳米溶液旋涂于玻璃基底上,然后在其上再旋涂PS:Alq3:DCJTB有机薄膜发光层,构成平面波导结构.用355nm波长的YAG激光泵浦样品.实验发现:相比于无Ag纳米颗粒情况,有Ag纳米颗粒时端面受激发射最大增强10.38倍,激射阈值从2.0mJ/cm2左右降低到0.5mJ/cm2左右;垂直表面受激发射最大增强6.13倍,激射阈值从2.5mJ/cm2左右降低到1.5mJ/cm2左右.该研究对实现低阈值有机半导体激光器具有重要意义.