基于布洛赫表面波的有机薄膜方向性发光性能  

Directional Luminescence Properties of Organic Thin Film Based on Bloch Surface Waves

作　　者：于猛 吕营[1] 邹德月 郭晓阳[1] 刘星元[1] YU Meng;LYU Ying;ZOU Deyue;GUO Xiaoyang;LIU Xingyuan(State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《发光学报》2023年第9期1521-1526,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62035013,51973208)。

摘　　要：布洛赫表面波(BSW)是光场局域在光子晶体表面层并沿着表面传播的一种电磁模式。本文在一维光子晶体上制备了PS∶C545T有机发光层,观察到了有机小分子C545T的激子耦合进BSW模式的荧光。通过对半球透镜耦合输出光斑的发光性能研究,分析比较了C545T的常规发光和BSW模式发光的不同特点。结果表明,BSW模式耦合输出环形的光斑,其荧光具有很窄的空间分布、线偏振和光谱角度可调的特性,并与常规辐射模式的光斑明显分离。一维光子晶体上的发光薄膜的辐射跃迁速率存在各向异性的现象,其中BSW模式的荧光具有更快的辐射跃迁速率。利用BSW的上述发光特点有助于开发具有一定方向性的偏振发光器件。Bloch surface wave(BSW)is an electromagnetic mode in which the light field is localized in the surface layer and propagates along the surface layer of the photonic crystal.In this paper,a PS∶C545T organic luminescence layer was prepared on a one-dimensional photonic crystal,and the fluorescence of the exciton of organic C545T molecules coupled into the BSW mode was observed.By studying the performance of the output light emission of the sample through the hemispherical lens coupling,different characteristics of the conventional luminescence and the BSW mode luminescence of C545T are analyzed and compared.The results show that the coupled BSW mode outputs a ring light spot,which has the characteristics of narrow spatial distribution,linear polarization and adjustable spectral with angle,and is obviously separated from the light spot of the conventional radiation mode.The radiation transition rate of luminous films on one-dimensional photonic crystals is anisotropic,and the BSW mode fluorescence has a faster radiation transition rate.The above luminescence characteristics of BSW mode can be utilized to develop polarized light-emitting devices with certain directivity.

关 键 词：布洛赫表面波 有机材料 偏振 角分布 一维光子晶体 

分 类 号：O734[理学—晶体学]