时域有限差分法
共发射极
辐射
光学
材料科学
物理
波长
辐射模式
计算物理学
偶极子
离散偶极子近似
振幅
光电子学
有机发光二极管
计算机科学
图层(电子)
电信
散射
纳米技术
量子力学
天线(收音机)
作者
Hannes Lüder,Martina Gerken
标识
DOI:10.1007/s11082-019-1838-4
摘要
Nanostructures in OLEDs allow to manipulate the radiation pattern and direct light of a specific wavelength into a specific angle in the far field by resonant light outcoupling. We present a theoretical study investigating simulation conditions for accurate radiation patterns employing the FDTD method. Radiation patterns of single dipole emitters placed in a sufficiently large simulation domain are superimposed to model the incoherent emission of a continuous emission layer. The necessary simulation domain size is derived by considering propagation length and field profile of the guided mode of a corresponding unstructured OLED. A 5 nm mesh resolution is determined as a good compromise between accuracy and simulation time. The position of an emitter with respect to the grating has a large influence on the radiation pattern. Nevertheless, we demonstrate for nine different OLED structures that the radiation pattern of a homogeneous emission layer is approximated with an amplitude error of less than 5% by superimposing only four equally spaced dipoles at positions $$\pm \,(1/8, 3/8, 5/8, 7/8) \cdot \varLambda /2$$ , which avoid points of high symmetry.
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