Improvement of optical extraction ef?ciency of organic light-emitting diode using a large area nano-pattern

In order to improve optical extraction ef?ciencies, we propose a nano-patterned organic lightemitting diode (OLED) which doesn't rely on high precision lithography nor rigorous periodicity. The nano-pattern is fabricated by spin-coating PS (poly-styrene) spheres on the substrate and carrying out reactive ion etching and ?attening using dielectric material. The veri?cation of the optical properties of the nano patterns was carried out by fabricating OLED-like structures using quantum dot and distributed Bragg re?ector (DBR). As a result, the nano-patterned structure showed a 28% increase in optical ef?ciency compared to the non-patterned sample. In addition, the use of a prism sheet on the backside of a glass substrate also showed a 23% increase in optical ef?ciency by disturbing the total internal re?ection between glass and air. In this way, the large area nano-patterns can be fabricated and applied to increasing the optical extraction in OLED.