Improving the Stability and Performance of Perovskite Light-Emitting Diodes by Thermal Annealing Treatment

Jae Choul Yu, Dae Woo Kim, Da Bin Kim, Eui Dae Jung, Jong Hyun Park, Ah Young Lee, Bo Ram Lee, Daniele Di Nuzzo, Richard H. Friend, Myoung Hoon Song

Research output: Contribution to journalArticleResearchpeer-review

103 Citations (Scopus)

Abstract

The effect of thermal annealing on the morphology and crystallinity of MAPbBr3 films as well as the performance and long-term stability of PeLEDs were investigated. A continuous perovskite film with high crystallinity was fabricated using a thermal annealing treatment. To obtain uniform and dense MAPbBr3 films, the MAPbBr3 layer used as the emissive layer was deposited onto a PEDOT:PSS-coated ITO/glass substrate by spin-casting a 1:1 molar ratio solution of PbBr2 and MABr in a DMF/HBr cosolvent. The PeLED with a MAPbBr3 film fabricated under optimized thermal annealing conditions exhibited improved device performance and full coverage of the green electroluminescence (EL) at the turn-on voltage because of the high quality of the continuous perovskite layer, as confirmed by scanning electron microscopy (SEM) and inverted optical microscopy. Moreover, the encapsulated PeLED with the MAPbBr3 film prepared under the optimized thermal annealing conditions exhibited excellent long-term stability under ambient conditions.

Original languageEnglish
Pages (from-to)6906-6913
Number of pages8
JournalAdvanced Materials
Volume28
Issue number32
DOIs
Publication statusPublished - 24 Aug 2016
Externally publishedYes

Keywords

  • electroluminescence
  • long-term stability
  • perovskite light-emitting diodes
  • perovskites

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