AI Article Synopsis
- 3D perovskite LEDs show promise for high brightness but often experience efficiency roll-off due to defects and ion migration when under electrical stress.
- Introducing a bifunctional molecule, 3-chlorobenzylamine, into the perovskite precursor helps grow high-quality crystals and reduces defects, improving performance.
- As a result, these enhanced LEDs achieve a peak efficiency of 16.6% and maintain 80% of this efficiency at high current densities, along with a record half-lifetime of 49 hours at a steady current.
Article Abstract
Three-dimensional (3D) perovskites have been demonstrated as an effective strategy to achieve efficient light-emitting diodes (LEDs) at high brightness. However, most 3D perovskite LEDs still suffer from serious efficiency roll-off. Here, using FAPbI as a model system, we find that the main reason for efficiency droop and degradation in 3D perovskite LEDs is defects and the ion migration under electrical stress. By introducing bifunctional-molecule 3-chlorobenzylamine additive into the perovskite precursor solution, the detrimental effects can be significantly suppressed through the growth of high crystalline perovskites and defect passivation. This approach leads to bright near-infrared perovskite LEDs with a peak external quantum efficiency of 16.6%, which sustains 80% of its peak value at a high current density of 460 mA cm, corresponding to a high brightness of 300 W sr m. Moreover, the device exhibits a record half-lifetime of 49 h under a constant current density of 100 mA cm.
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| http://dx.doi.org/10.1021/acs.nanolett.0c04900 | DOI Listing |
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