AC ‐Driven Quantum Dot Light‐Emitting Diodes

Quantum dot light-emitting diodes (QDLEDs) offer a range of advantages, including narrow emission width, high quantum yield, tunable emission wavelength, and high stability, making them a promising technology for commercial applications. Two types of QDLEDs exist: direct current (DC) driven and alternating current (AC) driven. The DC is a simple driving mode for the realization of effective luminescence of EL devices. In this chapter, the authors discuss the principle of AC-driven QDLEDs, performance metrics, materials required, and the research developments in recent years in QDLEDs. They present some optimization strategies that could potentially improve the performance of AC QDLEDs. The principle of QDLEDs can be understood through different theories, including photoexcitation, carrier injection, energy transfer, and ionization. In the photoexcitation theory, excitons are formed in quantum dots by absorbing high-energy photons.