Efficient Top-emitting Quantum Dot Light Emitting Diodes via Inkjet Printing

In this work, we report inkjet-printed top-emitting (TE) quantum dot light emitting diodes (QLEDs) for achieving high-resolution QLED displays. At the luminance of 1000 cd/m
²
, the TE devices exhibit a current efficiency of 5.90 cd/A which is 2.7-fold higher than 2.18 cd/A of the conventional bottom-emitting (BE) devices. The significant enhancement is owing to the well-controlled cavity length which is easy for inkjet printing.