Interfacial Anchoring Effect Enables Efficient Large-Area Sky-Blue Perovskite Light-Emitting Diodes

While tremendous progress has recently been made in perovskite light-emitting diodes (PeLEDs), large-area blue devices feature inferior performance due to uneven morphologies and vast defects in the solution-processed perovskite films. To alleviate these issues, a facile and reliable interface engineering scheme is reported for manipulating the crystallization of perovskite films enabled by a multifunctional molecule 2-amino-1,3-propanediol (APDO)-triggered anchoring effect at the grain-growth interface. Sky-blue perovskite films with large-area uniformity and low trap states are obtained, showing the distinctly improved radiative recombination and hole-transport capability. Based on the APDO-induced interface engineering, synergistical boost in device performance is achieved for large-area sky-blue PeLED (measuring at 100 mm(2)) with a peak external quantum efficiency (EQE) of 9.2% and a highly prolonged operational lifetime. A decent EQE up to 6.1% is demonstrated for the largest sky-blue device emitting at 400 mm(2).

Automated summary

This study presents an interface engineering scheme using a multifunctional molecule APDO to manipulate the crystallization of perovskite films, resulting in improved radiative recombination and hole-transport capability for large-area blue perovskite light-emitting diodes. The interface engineering enabled sky-blue perovskite films with uniformity and low trap states, leading to enhanced device performance with peak external quantum efficiency of 9.2% for 100 mm^2 devices and up to 6.1% for 400 mm^2 devices.