Hybrid Perovskite Light-Emitting Diodes Based on Perovskite Nanocrystals with Organic-Inorganic Mixed Cations.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28266750.
- Also identified by DOI 10.1002/adma.201606405.
- 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
Organic-inorganic hybrid perovskite materials with mixed cations have demonstrated tremendous advances in photovoltaics recently, by showing a significant enhancement of power conversion efficiency and improved perovskite stability. Inspired by this development, this study presents the facile synthesis of mixed-cation perovskite nanocrystals based on FA<sub>(1-</sub><sub>x</sub><sub>)</sub> Cs<sub>x</sub> PbBr<sub>3</sub> (FA = CH(NH<sub>2</sub> )<sub>2</sub> ). By detailed characterization of their morphological, optical, and physicochemical properties, it is found that the emission property of the perovskite, FA<sub>(1-</sub><sub>x</sub><sub>)</sub> Cs<sub>x</sub> PbBr<sub>3</sub> , is significantly dependent on the substitution content of the Cs cations in the perovskite composition. These mixed-cation perovskites are employed as light emitters in light-emitting diodes (LEDs). With an optimized composition of FA<sub>0.8</sub> Cs<sub>0.2</sub> PbBr<sub>3</sub> , the LEDs exhibit encouraging performance with a highest reported luminance of 55 005 cd m<sup>-2</sup> and a current efficiency of 10.09 cd A<sup>-1</sup> . This work provides important instructions on the future compositional optimization of mixed-cation perovskite for obtaining high-performance LEDs. The authors believe this work is a new milestone in the development of bright and efficient perovskite LEDs.