Full solution-processed heavy-metal-free mini-QLEDs for flexible display applications

Micro/mini displays play an extremely significant role in the modern information society, which is treated as a promising technology for a range of applications. Here, utilizing the full solution process with the electrode array mask, we successfully achieved passive-matrix and active-matrix mini-quantum dot light-emitting diodes (PM/AM-m-QLEDs) based on heavy-metal-free blue ZnTeSe/ZnS QDs. The pixels per inch (PPI) of m-QLEDs fabricated in this study can reach 36, 90, 180, and 360, which meet the requirements of televisions, computers, and mobile phones. Moreover, by adjusting the electrodes, m-QLEDs achieved patterned display applications based on both flexible and solid substrates. These results imply that heavy-metal-free blue m-QLEDs show a wide display application potential, i.e., AM/PM displays. Given the low-cost advantage of solution-processed QDs, our proposed techniques could pave the way for low-cost displays.

Automated summary

Micro/mini displays play a significant role in the modern information society and have promising applications. In this study, passive-matrix and active-matrix mini-quantum dot light-emitting diodes (PM/AM-m-QLEDs) based on heavy-metal-free blue ZnTeSe/ZnS QDs were successfully fabricated using a full solution process. The m-QLEDs achieved high pixels per inch (PPI) suitable for televisions, computers, and mobile phones, and patterned display applications on both flexible and solid substrates. The low-cost advantage of solution-processed QDs could pave the way for low-cost displays.