Visual Electrocardiogram Synchronization Monitor Using Perovskite-Based Multicolor Light-Emitting Diodes

Information visualization plays a prominent role in the development of wearable health monitoring devices. The use of multicolor electroluminescent (EL) devices for signal indicators has attracted considerable attention due to their simplicity, low cost, and easy observation. Here, we demonstrated a visual electrocardiogram (ECG) synchronization monitor using perovskite-based multicolor light-emitting diodes (PMCLEDs). The PMCLED can emit colorful light according to the change of the ECG signal. Through the addition of polyethylene glycol (PEG) in the charge transport layer (CTL) to modulate the carrier injection, color switching from deep red to green in a wide color range is obtained. The fabricated flexible PMCLEDs exhibit good color-tunable stability and high bending resistance, which can be conformally integrated on human skin for wearable application. By converting the small ECG signal to a voltage scheme to drive the PMCLEDs with dynamic sequential color change, we realized the function of real-time visualization of ECG information through a facile and low-cost way. The ECG visualization design may provide opportunities for the development of healthcare products with real-time biosignal monitoring.

Automated summary

The study demonstrated a visual electrocardiogram synchronization monitor using perovskite-based multicolor light-emitting diodes, which emit colorful light according to ECG signal changes. By adding PEG to modulate carrier injection, color switching from deep red to green was achieved, with the fabricated flexible PMCLEDs showing good color-tunable stability and bending resistance.