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Cited by 375

The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.

Highly Efficient Light-Emitting Diodes of Colloidal Metal–Halide Perovskite Nanocrystals beyond Quantum Size

Open access
Kim, Young-Hoon, Wolf, Christoph, Kim, Young-Tae, Cho, Himchan, Kwon, Woosung, Do, Sungan, Sadhanala, Aditya, Park, Chan Gyung, Rhee, Shi-Woo, Im, Sang Hyuk, Friend, Richard H., Lee, Tae-Woo·2017·ACS Nano

Abstract

Colloidal metal–halide perovskite quantum dots (QDs) with a dimension less than the exciton Bohr diameter D B (quantum size regime) emerged as promising light emitters due to their spectrally narrow light, facile color tuning, and high photoluminescence quantum efficiency (PLQE). However, their size-sensitive emission wavelength and color purity and low electroluminescence efficiency are still challenging aspects. Here, we demonstrate highly efficient light-emitting diodes (LEDs) based on the colloidal perovskite nanocrystals (NCs) in a dimension > D B (regime beyond quantum size) by using a multifunctional buffer hole injection layer (Buf-HIL). The perovskite NCs with a dimension greater than D B show a size-irrespective high color purity and PLQE by managing the recombination of excitons occurring at surface traps and inside the NCs. The Buf-HIL composed of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) and perfluorinated ionomer induces uniform perovskite particle films with complete film coverage and prevents exciton quenching at the PEDOT:PSS/perovskite particle film interface. With these strategies, we achieved a very high PLQE (∼60.5%) in compact perovskite particle films without any complex post-treatments and multilayers and a high current efficiency of 15.5 cd/A in the LEDs of colloidal perovskite NCs, even in a simplified structure, which is the highest efficiency to date in green LEDs that use colloidal organic–inorganic metal–halide perovskite nanoparticles including perovskite QDs and NCs. These results can help to guide development of various light-emitting optoelectronic applications based on perovskite NCs.

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Crossref · 10.1021/acsnano.6b07617

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Metadata

Authors
Kim, Y.-H., Wolf, C., Kim, Y.-T., Cho, H., Kwon, W., Do, S., Sadhanala, A., Park, C. G., Rhee, S.-W., Im, S. H., Friend, R. H., & Lee, T.-W.
Venue
ACS Nano
Published
2017-06-22
Volume
11
Issue
7
Pages
6586-6593
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W2622010062
Cited by
375
References
33
FWCI
20.47
Type
journal article
Language
en
Open access
green

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