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Los Alamos National LaboratoryCenter for Integrated Nanotechnologies
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DOE

2020 Highlights

A selection of CINT science highlights from staff and user research.

CINT Contacts  

  • Wanyi Nie
  • Quantum Materials Systems Thrust
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  • Sergei Tretiak
  • Nanophotonics and Optical Nanomaterials Thrust
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Molecular Engineering Makes Bright LEDs

Scientific Achievement

By incorporating bulky organic molecules, with atoms arranged in a ring, scientists have produced 2D layered perovskite LEDs with a seven-fold increase in brightness compared to perovskite LEDs layered with organic molecules in a linear chain.

Significance and Impact

This work suggests that the charges are strongly coupled to the structure in 2D perovskite system, and that structure tuning will allow manipulation of the charge recombination pathways to produce high light emission properties.

Research Details

  • The image shows a schematic of hole localization at Br atoms (green balls) that promotes light emission for bright LEDs.Introducing bulky organics – specifically, benzyl organic spacers – into a 2D perovskite system enhances charge localization.
  • The direct signature of hole localization at the bromide site was observed in thin films for the first time.
  • The localized hole promotes charge recombination and emits light with high efficiency.
  • The image shows a schematic of hole localization at Br atoms (green balls) that promotes light emission for bright LEDs.

Publication: Tsai H, Liu C, Kinigstein E, Li M, Tretiak S, Cotlet M, Ma X, Zhang X, Nie W. Critical Role of Organic Spacers for Bright 2D Layered Perovskites Light‐Emitting Diodes. Advanced Science. 2020 Apr;7(7):1903202. [DOI: 10.1002/advs.201903202]

Funding: H.T., S.T., and W.N. acknowledge the Laboratory Directed Research Directions (LDRD) program at Los Alamos National Laboratory (LANL). W.N. acknowledges the quantum initiative funding from LANL. H. T. acknowledges the financial support from Robert Oppenheimer (JRO) Distinguished Postdoc Fellowship at LANL. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Los Alamos National Laboratory (Contract 89233218CNA000001) and Sandia National Laboratories (Contract DE-NA-0003525). Part of this research used sector 8-ID-E and 11-ID-D of the Advanced Photon Source and Center for Nanoscale Materials, both Office of Science user facilities, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. This research used resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704.