Efficiency Enhancement of Graphene based flexible Organic light emitting diodes (original) (raw)

2018

Abstract

A study has been conducted on green microcavity flexible organic light emitting diodes to exploit its merits in enhancing the outcoupling efficiency of the device. Graphene based OLEDs have shown reported decrease in the device efficiencies in comparison to the conventional Indium Tin Oxide counterparts. The different device structures with quarter-wave stack alternating layers of high index titanium dioxide, TiO2 and low index silicon dioxide, SiO2 were simulated to study the effects of cavity length tuning for the optimum constructive interference resulting in the maximum outcoupling of the light. However, these DBR structures do not meet the mechanical flexibility compliance for the flexible OLEDs. Therefore, a device is proposed that exploits the theory of internal refraction and reflection that takes place between the high refractive index, TiO2 layer and the low refractive index hole injection layers sandwiching the graphene anode to maximize microcavity enhancement in the dev...

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