Triplet management for efficient perovskite light-emitting diodes

Chuanjiang Qin, Toshinori Matsushima, William J. Potscavage, Atula S.D. Sandanayaka, Matthew R. Leyden, Fatima Bencheikh, Kenichi Goushi, Fabrice Mathevet, Benoît Heinrich, Go Yumoto, Yoshihiko Kanemitsu, Chihaya Adachi

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3 Citations (Scopus)

Abstract

Perovskite light-emitting diodes are promising for next-generation lighting and displays because of their high colour purity and performance1. Although the management of singlet and triplet excitons is fundamental to the design of efficient organic light-emitting diodes, the nature of how excitons affect performance is still not clear in perovskite2–4 and quasi-two-dimensional (2D) perovskite-based devices5–9. Here, we show that triplet excitons are key to efficient emission in green quasi-2D perovskite devices and that quenching of triplets by the organic cation is a major loss path. Employing an organic cation with a high triplet energy level (phenylethylammonium) in a quasi-2D perovskite based on formamidinium lead bromide yields efficient harvesting of triplets. Furthermore, we show that upconversion of triplets to singlets can occur, making 100% harvesting of electrically generated excitons potentially possible. The external quantum and current efficiencies of our green (527 nm) devices reached 12.4% and 52.1 cd A−1, respectively.

Original languageEnglish
Pages (from-to)70-75
Number of pages6
JournalNature Photonics
Volume14
Issue number2
DOIs
Publication statusPublished - Feb 1 2020

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Qin, C., Matsushima, T., Potscavage, W. J., Sandanayaka, A. S. D., Leyden, M. R., Bencheikh, F., ... Adachi, C. (2020). Triplet management for efficient perovskite light-emitting diodes. Nature Photonics, 14(2), 70-75. https://doi.org/10.1038/s41566-019-0545-9