CINE WEBINAR: High-efficiency perovskite LEDs and their applications

High-efficiency perovskite LEDs and their applications

A major efficiency limit for solution-processed perovskite optoelectronic devices (e.g. light-emitting diodes, LEDs) is trap-mediated non-radiative losses.¹ Defect passivation using organic molecules has been identified as an attractive approach to tackle this issue. We significantly enhance the interaction with defects sites and minimize non-radiative recombination losses. Consequently, we achieve high-performance near infrared perovskite LEDs (PeLEDs) with a high external quantum efficiency (EQE) of 21.6%.² We find that our devices can also work efficiently in an emitting/detector switchable mode, with tens-megahertz speed for both functions. Benefiting from the small Stokes shift of perovskites, the diode shows high specific detectivity (>2×1012 Jones) at its peak emission (~ 800 nm), allowing optical signal exchange between two identical diodes. We further demonstrate the potential of the dual-functional diode for biomedicine diagnosis applications (as a monolithic heart pulse sensor) and for inter- and intra-chip bidirectional optical communications.³

1. X.K. Liu, et al, Nature Materials, DIO: 10.1038/s41563-020-0784-7 (2020)

2. W.Xu, et al, Nature Photonics, 13, 418 (2019)

3. C. Bao, et al, Nature Electronics, 3, 156 (2020)