Enhanced Electroluminescence from Organic Light-Emitting Diodes with an Organic-Inorganic Perovskite Host Layer.
basic_science · Level V
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- Record sourced from PubMed, PMID 30091178.
- Also identified by DOI 10.1002/adma.201802662.
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Abstract
The development of host materials with high performance is essential for fabrication of efficient and stable organic light-emitting diodes (OLEDs). Although host materials used in OLEDs are typically organics, in this study, it is shown that the organic-inorganic perovskite CH<sub>3</sub> NH<sub>3</sub> PbCl<sub>3</sub> (MAPbCl<sub>3</sub> ) can be used as a host layer for OLEDs. Vacuum-evaporated MAPbCl<sub>3</sub> films have a wide band gap of about 3 eV and very high and relatively balanced hole and electron mobilities, which are suitable for the host material. Photoluminescence and electroluminescence take place through energy transfer from MAPbCl<sub>3</sub> to an organic emitter in films. Incorporation of an MAPbCl<sub>3</sub> host layer into OLEDs leads to a reduction of driving voltage and enhancement of external quantum efficiency as compared to devices with a conventional organic host layer. Additionally, OLEDs with an MAPbCl<sub>3</sub> host layer demonstrate very good operational stability under continuous current operation. These results can be extensively applied to organic- and perovskite-based optoelectronics.