Bright and fast-response perovskite light-emitting diodes with an ICBA:modified-C 60 nanocomposite electrical confinement layer

Bright and fast-response CH NH PbBr perovskite light-emitting diodes (PeLEDs) are realized by using ICBA:modified C (MC ) nanocomposites as the hole blocking layer (HBL) and electron transport layer (ETL). The photoluminescence spectrum shows that the use of hydrophilic MC in the ETL helps the surface passivation of the perovskite layer. In addition, the photoelectron spectra and water-droplet contact angle images show that the use of the ICBA:MC nanocomposite ETL can simultaneously confine the electrons and holes in the perovskite layer, which boosts the injected electron-hole radiative recombination efficiency and thereby increases the electroluminescence from 1 cd m to 2080 cd m at 6 V when the ICBA:3,5OEC nanocomposite ETL is used. In addition, the operational frequency of the optimal PeLED is up to 1.5 MHz.