P‐90: Boosting the Efficiency of Cd‐Free Blue Quantum Dot Light‐Emitting Diodes via Charge Transport Layer Optimization

Quantum dot light‐emitting diodes (QLEDs) show great potential in the display and solid‐state lighting fields. However, the more mature cadmium‐based quantum dots and perovskite nanocrystals contain elements such as cadmium and lead, which pose a greater threat to the environment and human health and limit their larger‐scale applications. Therefore, Cd‐free quantum dots and its electroluminescent devices show greater potential. At present, the research of red and green QLEDs is progressing rapidly, while Cd‐free blue QLEDs are less reported, and the performance of the device is obviously lagging behind. Based on the above considerations, we optimized the thickness of the electron transport layer (ETL) and selected a more suitable hole transport materials (HTM) to make the carrier injection and transport more balanced, and finally obtained Cd‐free blue QLEDs with a high EQE up to 6.18%.