Efficient green light-emitting diodes based on quasi-two-dimensional composition and phase engineered perovskite with surface passivation

TLDR

Perovskite LEDs are promising for efficient, narrow‑band emission, but quasi‑two‑dimensional perovskites suffer from phase impurities and surface defects that limit their efficiency. The authors aim to identify optimal quasi‑two‑dimensional perovskite compositions through composition and phase engineering. They then apply surface passivation by coating the perovskite film with the organic small molecule trioctylphosphine oxide. The resulting green LEDs achieve a current efficiency of 62.4 cd A⁻¹ and an external quantum efficiency of 14.36 %.

Abstract

Abstract Perovskite light-emitting diodes (LEDs) are attracting great attention due to their efficient and narrow emission. Quasi-two-dimensional perovskites with Ruddlesden–Popper-type layered structures can enlarge exciton binding energy and confine charge carriers and are considered good candidate materials for efficient LEDs. However, these materials usually contain a mixture of phases and the phase impurity could cause low emission efficiency. In addition, converting three-dimensional into quasi-two-dimensional perovskite introduces more defects on the surface or at the grain boundaries due to the reduction of crystal sizes. Both factors limit the emission efficiency of LEDs. Here, firstly, through composition and phase engineering, optimal quasi-two-dimensional perovskites are selected. Secondly, surface passivation is carried out by coating organic small molecule trioctylphosphine oxide on the perovskite thin film surface. Accordingly, green LEDs based on quasi-two-dimensional perovskite reach a current efficiency of 62.4 cd A −1 and external quantum efficiency of 14.36%.