Abstract
Recent progress in the development of materials and devices for single-doped white devices is presented with a particular focus on the development of platinum complexes exhibiting excimer emission. White organic light emitting diodes (WOLEDs) are strong candidates for the next generation of solid-state lighting, yet many of the best devices generate white light using multiple emitters embedded in a comparably complex device structure, raising the difficulty of consistently manufacturing these devices at a low cost and leading to challenges in color stability. These problems can be overcome by fabricating excimer-based WOLEDs, which construct a broad spectrum from a single emitter using blue monomer emission and red excimer emission. Through rational emitter design, the color quality and device efficiencies have steadily improved with recent achievements of external quantum efficiencies over 20% and a color rendering index greater than 80. Furthermore, recent applications of tetradentate platinum complexes for single-doped WOLEDs have yielded devices with a performance superior to many state-of-the-art multilayer WOLEDs as well as promising device operational stability.
Highlights
Organic electronic devices have seen considerable investigation across a wide range of fields over the past several decades
Excimer-based White organic light emitting diodes (WOLEDs) are good candidates for generation white lighting due to their tunable broad emission spectra spanning the visible spectrum, their recently reported high efficiencies, and their ability to be fabricated in a simple single-dopant emissive layer
The development of efficient single-doped WOLEDs requires that the monomer and excimer species emit efficiently in a device setting
Summary
Organic electronic devices have seen considerable investigation across a wide range of fields over the past several decades. We will start with a discussion of color tuning strategies for achieving an ideal white color, followed by a discussion on the efficiency of excimer-based white emission, and finish with a discussion of recent developments in excimer emitting materials
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