Effective small organic molecule as a defect passivator for highly efficient quasi-2D perovskite light-emitting diodes

Journal article

The use of a small organic molecular passivator is proven to be a successful strategy for producing higher-performing quasi-2D perovskite light-emitting diodes (PeLEDs). The small organic molecule can passivate defects on the grain surround and surface of perovskite crystal structures, preventing nonradiative recombination and charge trapping. In this study, a new small organic additive called 2, 8-dibromodibenzofuran (diBDF) is reported and examines its effectiveness as a passivating agent in high-performance green quasi-2D PeLEDs. The oxygen atom in diBDF, acting as a Lewis base, forms coordination bonds with uncoordinated Pb²⁺, so enhancing the performance of the device. In addition, the inclusion of diBDF in the quasi-2D perovskite results in a decrease in the abundance of low-n phases, hence facilitating efficient carrier mobility. Consequently, PeLED devices with high efficiency are successfully produced, exhibiting an external quantum efficiency of 19.9% at the emission wavelength of 517 nm and a peak current efficiency of 65.0 cd A-¹.

Authors: Li, Y; Li, F; Yu, Z; Tamilavan, V; Oh, C-M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Wiley
• Journal: Small
• Volume: 20
• Issue: 23
• Article number: 2308847
• Publication date: 2024-01-04
• Acceptance date: 2023-12-13
• DOI: 10.1002/smll.202308847
• EISSN: 1613-6829
• ISSN: 1613-6810
• Pmid: 38174599
• Language: English
• Keywords: quasi‐2D; FFR; defect passivation; light‐emitting diodes