Recent Advances in Light‐Emitting Electrochemical Cells Based on Quantum Dots

Abstract Quantum dots (QDs) have emerged as a research focus in optoelectronics owing to their exceptional properties, including ultra‐narrow full‐width at half maximum, tunable emission wavelengths, high quantum yields, and superior color purity. On the other hand, light‐emitting electrochemical cells (LECs), characterized by simple fabrication processes, low‐cost manufacturing, and solution processability, represent a promising class of electroluminescent devices. By synergistically combining these merits, QD‐based LECs (QLECs) emerge as a highly promising kind of optoelectronic devices for display and lighting applications. In this invited review, it comprehensively examines recent advances in QLECs, providing a systematic overview of innovations in luminescent materials and device optimizations. Fundamental concepts, including QD photophysical properties and LEC operational mechanisms, are first elucidated. Development strategies are then analyzed, emphasizing material engineering approaches and charge dynamics management involving injection, transport, and balance. In addition, the expansion of QLEC devices is also introduced (e.g., light‐emitting memory and quantum dot‐electrolyte light‐emitting diode), clarifying the role of QLECs in pioneering next‐generation or new kinds of devices. At the end, current existing challenges and future prospective research directions for advancing this field are discussed. It is expected that this review will provide ideas for developing more possibilities of QLECs.