Recent Advances in Alternating Current-Driven Organic Light-Emitting Devices

Abstract

Organic light-emitting devices (OLEDs), typically operated with constant-voltage or direct-current (DC) power sources, are candidates for next-generation solid-state lighting and displays, as they are light, thin, inexpensive, and flexible. However, researchers have focused mainly on the device itself (e.g., development of novel materials, design of the device structure, and optical outcoupling engineering), and little attention has been paid to the driving mode. Recently, an alternative concept to DC-driven OLEDs by directly driving devices using time-dependent voltages or alternating current (AC) has been explored. Here, the effects of different device structures of AC-driven OLEDs, for example, double-insulation, single-insulation, double-injection, and tandem structure, on the device performance are systematically investigated. The formation of excitons and the dielectric layer, which are important to achieve high-performance AC-driven OLEDs, are carefully considered. The importance of gaining further understanding of the fundamental properties of AC-driven OLEDs is then discussed, especially as they relate to device physics.

Recent advances in alternating current (AC)-driven organic light-emitting devices (OLEDs) are highlighted, regarding device structure, operation, and performance, focusing mainly on different device structures of AC-driven OLEDs. These structures include double-insulation, single-insulation, double-injection, and tandem structures. A great future can be expected for high-performance AC-driven OLEDs in further exploration of new device structures, designing new materials, and understanding the device physics.

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