Ultrathin Quantum Dot Display Integrated with Wearable Electronics

An ultrathin skin‐attachable display is a critical component for an information output port in next‐generation wearable electronics. In this regard, quantum dot (QD) light‐emitting diodes (QLEDs) offer unique and attractive characteristics for future displays, including high color purity with narrow bandwidths, high electroluminescence (EL) brightness at low operating voltages, and easy processability. Here, ultrathin QLED displays that utilize a passive matrix to address individual pixels are reported. The ultrathin thickness (≈5.5 µm) of the QLED display enables its conformal contact with the wearer's skin and prevents its failure under vigorous mechanical deformation. QDs with relatively thick shells are employed to improve EL characteristics (brightness up to 44 719 cd m −2 at 9 V, which is the record highest among wearable LEDs reported to date) by suppressing the nonradiative recom…