Modeling and Analysis of Waveguide Modes in Organic Light Emitting Diode for Bio- sensing Applications

The Organic Light Emitting diode are light sources that are useful in bio sensing and display applications. Because of the internal framework light produced by electron-hole recombination inside the emissive layer may be passed to a few channels: slabbing guided modes, substrate guided modes and to a small degree modes will pass through air. To figure out where and why photons can be stuck in the slab geometry, Modal analysis is carried out. The losses are due to the material dispersion and absorption by the cathode metal layer. In this work, the waveguide mode analysis of Planar OLED is presented. Finite difference Eigen mode solver is used to observe the losses and effective indices in the guided modes at wavelength of 540nm. In this present method, analysis is limited to the plane geometry and it is a very quick tool that can optimize the layered structure. Two simple techniques are apparent to optimize the emission of OLED. The first is to focus on a Limited waves coupling. The second concerns light recycling from inevitable guided modes to air propagating modes. This can be done, for example by scattering, gratings and lens arrays. This work aims to describes on restricted coupling of guided modes.