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This work describes the simulation and modeling of current voltage characteristics of polymer light emitting diode. To understand the device characteristics first a single layer organic device with single carrier injection is studied. The simulations are used to clarify the role of barrier height, device thickness and mobility. A new analytical model is developed based on a simple mobility model that matches well with the experimental characteristic. It is shown that in a single layer OLED with both elect ron and hole injection recombination takes place primarily near the cathode due to the much smaller electron mobility. It is also shown that with the proper adjustment of the anode barrier height recombination is spread uniformly over the bulk. In the two layer device, presence of barrier at the organic organic interface results in most of the recombination taking place at the interface of two organic layers. It is shown that to get good device efficiency, hole barrier at the interface should be sufficientl y large and greater than 0.3 eV. Electron barrier at the interface however plays no significant role. It is also shown that the electron transport layer largely determines turn on voltage of the device. For more details click here Back