Novel hybrid light-emitting devices based on MAPbBr 3 nanoplatelets:PVK nanocomposites and zinc oxide nanorod arrays

Szu Ping Wang, Chun Kai Chang, Sheng-Hsiung Yang, Che Yu Chang, Yu Chiang Chao

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5 Scopus citations

Abstract

In this research, we demonstrate inverted perovskite light-emitting devices (PeLEDs) based on zinc oxide nanorod arrays (ZnO NAs) as the electron transport layer and methylammonium lead bromide nanoplatelets (MAPbBr 3 NPLs) as the emissive material for the first time. The polyethyleneimine ethoxylated (PEIE) was inserted between the ZnO NAs and the MAPbBr 3 NPLs layer to reduce the energy barrier and improve the electron injection efficiency. Besides, different weight ratios of poly(N-vinylcarbazole) (PVK) were blended with MAPbBr 3 NPLs to make evenly dispersed nanocomposite films, thereby enhancing the performance of devices. Meanwhile, the photoluminescence of MAPbBr 3 NPLs:PVK nanocomposite film was increased due to reduced self-quenching and prolonged carrier lifetime. Inverted PeLEDs with the configuration of ITO/PEIE-modified ZnO NAs/MAPbBr 3 NPLs:PVK/TFB/Au were fabricated and evaluated, using TFB as the hole transport layer. The current density of the devices containing PVK matrix was significantly suppressed compared to those without PVK. Herein, the best device revealed a max brightness of 495 cd m -2 and a low turn-on voltage of 3.1 V that shows potential use in light-emitting applications.

Original languageEnglish
Article number015037
JournalMaterials Research Express
Volume5
Issue number1
DOIs
StatePublished - 1 Jan 2018

Keywords

  • inverted light-emitting devices
  • nanoplatelets
  • perovskite
  • zinc oxide nanorod arrays

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