Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes.
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Authors
Lai, May-Ling
Anaya, Miguel
Tong, Yu
Gałkowski, Krzysztof
Doherty, Tiarnan
Huq, Tahmida
Mackowski, Sebastian
Polavarapu, Lakshminarayana
Feldmann, Jochen
MacManus-Driscoll, Judith L
Urban, Alexander S
Publication Date
2019-05-10Journal Title
ACS Energy Lett
ISSN
2380-8195
Publisher
American Chemical Society (ACS)
Volume
4
Issue
5
Pages
1181-1188
Language
eng
Type
Article
This Version
AM
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Hoye, R., Lai, M., Anaya, M., Tong, Y., Gałkowski, K., Doherty, T., Li, W., et al. (2019). Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes.. ACS Energy Lett, 4 (5), 1181-1188. https://doi.org/10.1021/acsenergylett.9b00571
Abstract
Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum efficiencies (EQEs) of blue-emitting NPl light-emitting diodes (LEDs) have reached only 0.12%. In this work, we show that NPl LEDs are primarily limited by a poor electronic interface between the emitter and hole injector. We show that the NPls have remarkably deep ionization potentials (≥6.5 eV), leading to large barriers for hole injection, as well as substantial nonradiative decay at the NPl/hole-injector interface. We find that an effective way to reduce these nonradiative losses is by using poly(triarylamine) interlayers, which lead to an increase in the EQE of the blue (464 nm emission wavelength) and sky-blue (489 nm emission wavelength) LEDs to 0.3% and 0.55%, respectively. Our work also identifies the key challenges for further efficiency increases.
Sponsorship
Royal Academy of Engineering (RAEng) (RF\201718\17101)
Engineering and Physical Sciences Research Council (EP/M005143/1)
Engineering and Physical Sciences Research Council (EP/L016087/1)
Engineering and Physical Sciences Research Council (EP/N004272/1)
Engineering and Physical Sciences Research Council (EP/L011700/1)
European Research Council (756962)
EPSRC (1647980)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (841386)
Identifiers
External DOI: https://doi.org/10.1021/acsenergylett.9b00571
This record's URL: https://www.repository.cam.ac.uk/handle/1810/292261
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