36.3: An Organic Light‐Emitting Diode with Highly Efficient Light Extraction Using Newly Developed Diffraction Layer

Abstract

In order to improve light extraction from an organic light emitting diode (OLED), a novel structure of a top emission OLED was proposed by applying the diffraction layer. We have achieved 1.65 times higher light extraction efficiency in case of electroluminescence (EL), and 2.37 times in case of photoluminescence (PL).

68.2: Using Rigorous Electromagnetic Analysis in Modeling OLEDs with Gratings

“…The thickness of ITO and EML layer are fixed to 75 nm and 20 nm. Silver (Ag) is chosen as the reflector to reduce the absorption of the waveguide light [11]. The dipole is placed at the interface between EML and HTL.…”

“…We put attention on the influence of cavity modes by the grating. The results of air mode power according to equation (7) are shown in Fig. 4.…”

“…where k t is the tangential component of wave vector and β is the propagation constant. The exact expression of E(k x ,k y ) is studied in [11]. From the continuity of the tangential fields we could get the scattering matrix at every interface.…”

“…One of popular topics is OLEDs incorporated with periodic structures. The periodic corrugated layer is to couple out the waveguide and substrate modes into the out-coupled air mode [7][8]. In order to optimize the device efficiently, a simple and accurate modeling of OLED characteristics is required before the experiments.…”