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Stable and bright formamidinium-based perovskite light-emitting diodes with high energy conversion efficiency.

Abstract：

:Solution-processable perovskites show highly emissive and good charge transport, making them attractive for low-cost light-emitting diodes (LEDs) with high energy conversion efficiencies. Despite recent advances in device efficiency, the stability of perovskite LEDs is still a major obstacle. Here, we demonstrate stable and bright perovskite LEDs with high energy conversion efficiencies by optimizing formamidinium lead iodide films. Our LEDs show an energy conversion efficiency of 10.7%, and an external quantum efficiency of 14.2% without outcoupling enhancement through controlling the concentration of the precursor solutions. The device shows low efficiency droop, i.e. 8.3% energy conversion efficiency and 14.0% external quantum efficiency at a current density of 300 mA cm-2, making the device more efficient than state-of-the-art organic and quantum-dot LEDs at high current densities. Furthermore, the half-lifetime of device with benzylamine treatment is 23.7 hr under a current density of 100 mA cm-2, comparable to the lifetime of near-infrared organic LEDs.

journal_name

Nat Commun

journal_title

Nature communications

authors

Miao Y,Ke Y,Wang N,Zou W,Xu M,Cao Y,Sun Y,Yang R,Wang Y,Tong Y,Xu W,Zhang L,Li R,Li J,He H,Jin Y,Gao F,Huang W,Wang J

doi

10.1038/s41467-019-11567-1

subject

Has Abstract

pub_date

2019-08-09 00:00:00

pages

3624

issue

1

issn

2041-1723

pii

10.1038/s41467-019-11567-1

journal_volume

10

pub_type

杂志文章

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