Recent advances of eco-friendly quantum dots light-emitting diodes for display

The outstanding properties of wide and flexibly tunable emission range, high color saturation, and cost-effectiveness make quantum dots (QDs) promising candidates in display field. However, the vast majority of QDs used in high-performance display devices contain toxic elements such as cadmium (Cd) or lead (Pb). In recent years, with increasing attention to physical health and ecological environment, the application of eco-friendly QDs in light-emitting diodes (LEDs) has been vigorously explored through tremendous efforts in material engineering and device architecture. The external quantum efficiency (EQE) of red InP-based and blue ZnSe-based quantum dot light-emitting diode (QLED) has exceeded 21.4% and 20.2%, which owns good stability and high color purity. In this review, the recent research progress of three major projects implemented on four types of eco-friendly QDs, including existing challenges and possible solutions, and their feedback on device performance are summarized, aiming to provide guidance for the further development of eco-friendly QLEDs.