Flechon, C; (2013) Organic Light-Emitting Diodes based on New Promising Materials. Doctoral thesis , UCL (University College London).

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Abstract

The present work focuses on the investigation of two types of new materials, phosphorescent and near-infrared, for the fabrication of solution-processible Organic Light-Emitting Diodes (OLEDs). After the introduction of the theoretical background in the first part, the second part concentrates on phosphorescent OLEDs based on copper transition metal complexes. The photophysical properties of the copper complexes, the phosphorescent host and the interlayers were studied before the fabrication of phosphorescent OLEDs. Despite the various colours exhibited by the metal complexes all devices emit white light. The possible formation of an exciplex at the guest/host interface was thus investigated. Finally the influence of the solvent on the morphologies of the films and the performances of the devices were studied. The third part focuses on near-infrared OLEDs obtained by using two different strategies. First by using a near-infrared copolymer emitting at 880 nm and incorporating it in green and red hosts and second by the creation of what is believed to be an exciplex at the interface between a hole injection layer and twisted organic molecules that emit at 515 and 540 nm. In both cases pure infra-red light above 800 nm was achieved.

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