Directional Light Emission from Layered Metal Halide Perovskite Crystals

Grant Walters, Louis Haeberlé, Rafael Quintero-Bermudez, Julien Brodeur, Stéphane Kéna-Cohen, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Metal halide perovskites are being increasingly explored for use in light-emitting diodes (LEDs), with achievements in efficiency and brightness charted across the spectrum. One path to further boosting the fraction of useful photons generated by injected electrical charges will be to tailor the emission patterns of devices. Here we investigate directional emission from layered metal halide perovskites. We quantify the proportion of in-plane versus out-of-plane transition dipole components for a suite of layered perovskites. We find that certain perovskite single crystals have highly anisotropic emissions and up to 90% of their transition dipole in-plane. For thin films, emission anisotropy increases as the nominal layer thickness decreases and is generally greater with butylammonium cations than with phenethylammonium cations. Numerical simulations reveal that anisotropic emission from layered perovskites in thin-film LEDs may lead to external quantum efficiencies of 45%, an absolute gain of 13% over equivalent films with isotropic emitters.

Original languageEnglish (US)
Pages (from-to)3458-3465
Number of pages8
JournalJournal of Physical Chemistry Letters
Issue number9
StatePublished - May 7 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Directional Light Emission from Layered Metal Halide Perovskite Crystals'. Together they form a unique fingerprint.

Cite this