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Intense Broadband Emission in Layered Perovskites

Dec. 27, 2019

Broadband emission in Ruddlesden-Popper lead iodide perovskites (PEA2MAn-1PbnI3n+1) can be induced through cation impurity atom doping and/or alloying.

Scientific Achievement

We investigate and understand the origin of Sn-alloying induced broadband emission in layered lead iodide perovskites and the impact of inorganic layer thickness on emission properties

Significance and Impact

This work demonstrates key factors that impact the emission properties of layered hybrid perovskites, advancing their potential for light-emitting applications.

Research Details

  • Crystals of different Sn% and inorganic layer thickness (n=1, 2 and 3) were  characterized.
  • Carrier dynamics of Sn-alloyed layered 2D perovskites were studied using transient reflectance spectroscopy.
  • Density-functional theory (DFT) calculation revealed that the nature of the broad emission is due to self-trapped exciton formation.
  • Sensitivity of broad emission from trace Sn can also impact targeted "Sn-free" sample properties.

DOI: 10.1021/acsenergylett.9b02490

Related People

Yanfa Yan
University of Toledo

Matthew Beard
National Renewable Energy Laboratory

David Mitzi
Duke University

Schematic showing six charts and 3 diagrams of molecules