Near-Infrared-II Light-Emitting Diodes Based on Heavy-Metal-Free Quantum Dots

Colloidal quantum dots (CQDs) are promising emitters for near-infrared light emitting diodes (NIR LEDs) due to their highly-valued properties such as size-tunable emission and high photoluminescence quantum efficiencies (PLQE). However, NIR LEDs based on CQDs generally employ restricted heavy metals such as lead (PbSe, PbS, CsPbI₃) or cadmium (CdTe), and their performance remain modest compared to their visible counterparts. In this talk, I will discuss new strategies to prepare highly-efficient NIR LEDs based on heavy-metal-free indium arsenide (InAs) core-shell CQDs with long emission wavelengths of >1000 nm. These devices could find significant applications in eye-safe depth sensing, LiDAR and health-monitoring technologies.