Abstract: Although LED (Light Emitting Diode) was discovered in the 1900s, in recent years, it is utilized in lighting, screens and many indoor and outdoor applications widely. On the other hand, OLED (Organic Light Emitting Diode) technology is one of the advancing branches of LED technology. OLEDs, differently from other ordinary LEDs, contain organic light emitting layers between two electrical contacts. OLEDs are very slim and flexible. They are capable of providing more vivid and brighter display compared to LCDs (Light Crystal Displays). In our study, information about structural characteristics of OLED has been given. Band model of OLED has been explained, and functional equalities have been included. A three layer OLED has been designed. Optic materials with high light efficiency such as IRPPY, BCP, and Alq3 have been used in the structure of OLED. In the analyses, General-purpose Photovoltaic Device Model – gpvdm simulation software has been used. Bandwidth values of the layers have been determined respectively as 3.e-08, 5.e-08 and 2.e-08. As optical materials, Indium Tin Oxide (ITO) for anode and Silver (Ag) for cathode have been used. To the OLED designed, in an electrical circuit with current limiting, a voltage between -0.2V and 2.5 V has been implemented, and light output power variance curves have been obtained. On OLED band structure, energy level variance curves of lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) have been obtained according to Maxwell-Boltzmann statistical features. Photon density emitted by optical materials used, and energy and location variance data have been obtained. Efficiency values of designed OLED have been aimed to be at optimum level. In order for HOMO and LUMO energy levels to stay at equilibrium state, bandwidth values have been analyzed. The study has been aimed to be a pathfinder in the direction of being able to analyze effects of OLED technology and organic layers on energy level.
Keywords: OLED, band model, HOMO - LUMO energy, optic materials.