Organic Resonant-Cavity-Enhanced LEDs

Student: Hock Chye Lim

Supervisor: Aleksandar Rakic

Category: Engineering Thesis Project - Communications

Organic light emitting diodes (OLEDs) have been the central attraction of the modern displaying units because they inherited lot of high potentials. In the future, it is believe that OLEDs will be in the use for most of the key electronic displays. In order to achieve the optimum displaying power, the device made use of a well-designed microcavity with Distributed Bragg Reflector mirror (DBR) to enhance the effect properly.

Studies have been made on the organic materials and found out that they have high efficiencies and are small-molecule based material. Therefore, devices made of organics materials are able to display at a higher Electroluminescence (EL) intensity and more compatibility with the substrates. Compared with semiconductor devices, OLEDs offer advantageous properties like wider viewing angle, low operating voltage, better resolution, cost effective and adaptability to environment etc.

This thesis is to simulate different emission patterns of the OLEDs to suit the required patterns. A microcavity with DBR mirror structure is used as a model of the simulation. By changing the DBR layers’ refractive indices and the number of the DBR layers, there will a change in the emission pattern. All the calculation and the simulation are done using the Matlab Program.

Thesis Document (PDF)

Poster Presentation (PDF)