Transparent near-infrared perovskite light-emitting diodes.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32839475.
- Also identified by DOI 10.1038/s41467-020-18110-7 and PMC identifier 7445238.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Mobile and wearable devices are increasingly reliant on near-infrared (NIR) covert illumination for facial recognition, eye-tracking or motion and depth sensing functions. However, these small devices offer limited spatial real estate that is typically already occupied by their full-area electronic color displays. Here, we report a transparent perovskite light-emitting diode (LED) that could be overlaid across a color display to provide an efficient and high-intensity NIR illumination. Our transparent devices are constructed with an ITO/AZO/PEIE/FAPbI<sub>3</sub>/poly-TPD/MoO<sub>3</sub>/Al/ITO/Ag/ITO architecture, and offer a high average transmittance of more than 55% across the visible spectral region. In particular, our Al/ITO/Ag/ITO top transparent electrode was designed to offer a combination low sheet resistance and low plasma damage upon electrode deposition. The devices emit at 799 nm with a high total external quantum efficiency of 5.7% at a current density of 5.3 mA cm<sup>-2</sup> and a high radiance of 1.5 W sr<sup>-1</sup> m<sup>-2</sup>, and possess a large functional device area of 120 mm<sup>2</sup>. The efficient performance is ideal for battery-powered wearable devices, and could enable advanced security and sensing features on future smart-watches, phones, gaming consoles and augmented or virtual reality headsets.