三角形银纳米颗粒淬灭八羟基喹啉铝发光研究  

Research of the Emission Quenching of Tris-(8-Hydroxyquinoline) Aluminum by Silver Nanoprisms

作　　者：叶松[1] 余建立[1] 王向贤[1] 许明坤[1] 侯宜栋[2] 张志友[2] 杜惊雷[2] 

机构地区：[1]巢湖学院电子工程与电气自动化学院,安徽合肥238000 [2]四川大学物理科学与技术学院,四川成都610064

出　　处：《光学学报》2014年第11期239-244,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11305111;61307039;61377054);安徽省高校自然科学基金(KJ2013B163);巢湖学院自然科学基金(XLZ201201)

摘　　要：基于光学天线原理，通过实验和数值计算研究了三角形银纳米颗粒膜对八羟基喹啉铝（Alq3）发光的猝灭。Alq3发光猝灭是由于光子能量与三角形银纳米颗粒的面内电四极子发生能量共振耦合。实验中，猝灭因子为0．25-0．5。三角形银纳米颗粒密度增加形成较多二聚体和三聚体等，使近场电场场强增加，激发效率增加，导致猝灭因子减小。数值模拟得到三角形银纳米颗粒对Alq3的平均猝灭因子为0．44，与实验结果基本一致。研究结果为基于三角形银纳米颗粒的分子传感、表面等离子体光学成像等应用提供了有价值的参考。Based on the optical antenna theory, the emission quenching of tris-（8-hydroxyquinoline） aluminum （Alq3） by silver nanoprisms is investigated by experiments and numerical simulations. The emission quenching is attributed to the coupling between the emission of Alq3 and the in-plan electric quadrupole resonance of silver nanoprisms. In experiments, the quenching factor is 0.25-0.5. As the density of silver nanoprisms on the substrate increases, the dimers and trimers increase. It enhances the near-field electric field, improves the excitation efficiency and decreases the quenching factor. Numerically, the quenching factor is about 0.44. It is agreement on experimental results. The study is significant to apply the nanoprism for molecular sensor and surface-plasmon- assistant image.

关 键 词：表面光学 发光猝灭 Purcell因子 量子效率 ALQ3 

分 类 号：O434.14[机械工程—光学工程]