Unlocking the Potential of Blue Perovskite Light-Emitting Diodes for Active-Matrix Displays

Perovskite light-emitting diodes (PeLEDs) emerge as a promising kind of optoelectronic devices for the next-generation full-color display and white-lighting technology. However, the performance of blue PeLEDs is far from satisfactory and some significant properties still remain unknown. Herein, for the first time, the active-matrix display potential of blue PeLEDs has been unveiled by virtue of highly efficient, bright, and color-stable blue PeLEDs. Through a synergistic strategy of ligand-, anti-solvent-, device-, and additive engineering, the photoluminescence quantum yield of blue perovskite films is as high as 76%. Blue PeLEDs exhibit a maximum external quantum efficiency of 9.81% at 251 cd m(-2), a maximum power efficiency of 9.78 lm W-1, a peak luminance of 2298 cd m(-2), and stable emissions, rendering that the performance is among the best blue PeLEDs. Furthermore, the integration applications of blue PeLEDs have been studied and the first prototype active-matrix blue PeLED pixel circuit is demonstrated. Moreover, an unprecedented endeavor for active-matrix flexible blue PeLEDs has been taken. The findings not only provide an alternative approach to achieve high-performance blue PeLEDs, but also unlock the significant active-matrix property of blue PeLEDs, which may pave the pathway for PeLED-based display technology and related integrated optoelectronics.