Efficient and Stable Red Perovskite Light-Emitting Diodes with Operational Stability >300 h.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33687773.
- Also identified by DOI 10.1002/adma.202008820.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The long-term operational stability of perovskite light-emitting diodes (PeLEDs), especially red PeLEDs with only several hours typically, has always faced great challenges. Stable β-CsPbI<sub>3</sub> nanocrystals (NCs) are demonstrated for highly efficient and stable red-emitting PeLEDs through incorporation of poly(maleic anhydride-alt-1-octadecene) (PMA) in synthesizing the NCs. The PMA can chemically interact with PbI<sub>2</sub> in the precursors via the coupling effect between O groups in PMA and Pb<sup>2+</sup> to favor crystallization of stable β-CsPbI<sub>3</sub> NCs. Meanwhile, the cross-linked PMA significantly reduces the Pb<sub>Cs</sub> anti-site defect on the surface of the β-CsPbI<sub>3</sub> NCs. Benefiting from the improved crystal phase quality, the photoluminescence quantum yield for β-CsPbI<sub>3</sub> NCs films remarkably increases from 34% to 89%. The corresponding red-emitting PeLEDs achieves a high external quantum efficiency of 17.8% and superior operational stability with the lifetime, the time to half the initial electroluminescence intensity (T<sub>50</sub> ) reaching 317 h at a constant current density of 30 mA cm<sup>-2</sup> .