Fabrication and Study of White‐Light OLEDs Based on Novel Copolymers with Blue, Yellow, and Red Chromophores

Abstract

White Organic Light‐Emitting Diodes (WOLEDs) have attracted an enormous interest because they can be implemented in numerous lighting applications as next‐generation light sources. Several device setups such as multilayer, blends, or single layers of polymer nanomaterials have been proposed to achieve white light emission. In this work, novel copolymers bearing blue, yellow, and red chromophores, are used for the fabrication of WOLED systems including single emissive layer. These terpolymers provide easy tuning of white color emission by selecting the appropriate ratios between the chromophores while being solution processable from typical organic solvents, like chlorobenzene (CB), o‐dichlorobenzene (o‐DCB), etc. The chromophores can be directly excited by capturing charge carriers or through energy transfer from the other chromophores. Incomplete energy transfer between the chromophores is necessary to get white light as combined emission from all of them. The opto‐electronic and electro‐optical characterization is carried out by NIR–Vis–far UV spectroscopic ellipsometry, photoluminescence, and electroluminescence, to provide valuable information toward the optimization and functionalization of these WOLED devices.