Centrifugal-Coated Quasi-Two-Dimensional Perovskite CsPb2Br5 Films for Efficient and Stable Light-Emitting Diodes

Chuanjiang Qin, Toshinori Matsushima, Atula S.D. Sandanayaka, Youichi Tsuchiya, Chihaya Adachi

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49 Citations (Scopus)

Abstract

The optical, structural, and electroluminescent (EL) characteristics of pure quasi-2D CsPb2Br5 were reported. We fabricated continuous, compact, well-crystallized CsPb2Br5 films by centrifugal coating from a colloidal solution containing CsPb2Br5 nanoparticles. The centrifugal-coated CsPb2Br5 films have a photoluminescence quantum yield (PLQY) of ∼35% because of its low-dimensional structure. Taking advantage of the high PLQY, we fabricated perovskite light-emitting diodes (PeLEDs) with a centrifugal-coated CsPb2Br5 emitting layer exhibiting bright green EL, a maximum luminance of 7317 cd m-2, an and external quantum efficiency of 1.1%. Additionally, the EL color could be changed easily from green to red using a halogen exchange method. The half lifetime of our CsPb2Br5 PeLEDs reached around 6 h under continuous operation at 10 mA cm-2.

Original languageEnglish
Pages (from-to)5415-5421
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume8
Issue number21
DOIs
Publication statusPublished - Nov 2 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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