Stable Hexylphosphonate-Capped Blue-Emitting Quantum-Confined CsPbBr<sub>3</sub> Nanoplatelets.
ACS energy letters
American Chemical Society
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Shamsi, J., Kubicki, D., Anaya, M., Liu, Y., Ji, K., Frohna, K., Grey, C., et al. (2020). Stable Hexylphosphonate-Capped Blue-Emitting Quantum-Confined CsPbBr<sub>3</sub> Nanoplatelets.. ACS energy letters, 5 (6), 1900-1907. https://doi.org/10.1021/acsenergylett.0c00935
Quantum-confined CsPbBr3 nanoplatelets (NPLs) are extremely promising for use in low-cost blue light-emitting diodes but their tendency to coalesce in both solu-tion and film form, particularly under operating device condi-tions with injected charge-carriers, is hindering their adop-tion. We show that employing a short hexyl-phosphonate lig-and (C6H15O3P) in a heat-up colloidal approach for pure, blue-emitting quantum-confined CsPbBr3 NPLs significantly sup-presses these coalescence phenomena compared to particles capped with the typical oleyammonium ligands. The phosphonate passivated NPL thin films exhibit photolumines-cence quantum yields of ~40% at 450 nm with exceptional ambient and thermal stability. The color purity is preserved even under continuous photo-excitation of carriers equivalent to LED current densities of ~3 A/cm2. 13C, 133Cs and 31P solid-state MAS NMR reveal the presence of phosphonate on the surface. Density functional theory calculations suggest that the enhanced stability is due to the stronger binding affinity of the phosphonate ligand compared to the ammonium lig-and.
J. S. and S.D.S. acknowledge the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (HYPERION, grant agreement number 756962). S.D.S acknowledges funding from the Royal Society and Tata Group (UF150033). R.H.F. and Y.L. acknowledge sup-port from the Simons Foundation (grant 601946). M.A. and D.K. acknowledges funding from the European Union’s Hori-zon 2020 research and innovation programme under the Ma-rie Skłodowska-Curie (grant agreement number 841386 and 841136, respectively). K.J. acknowledges funding from the Royal Society (RGFR1180002). K.F. acknowledges a George and Lilian Schiff Studentship, Winton Studentship, the Engineer-ing and Physical Sciences Research Council (EPSRC) student-ship, Cambridge Trust Scholarship, and Robert Gardiner Scholarship. C. P. G. acknowledges the European Research Council (ERC) under the European Union’s Horizon 2020 re-search and innovation program (835073) and the Royal Society for a Research Professorship (RP\R1\180147). The authors acknowledge the EPSRC for funding (EP/R023980/1).
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (841136)
Royal Society (UF150033)
European Commission Horizon 2020 (H2020) ERC (756962)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (841386)
European Commission Horizon 2020 (H2020) ERC (835073)
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External DOI: https://doi.org/10.1021/acsenergylett.0c00935
This record's URL: https://www.repository.cam.ac.uk/handle/1810/305558
Attribution 4.0 International (CC BY)
Licence URL: http://creativecommons.org/licenses/by/4.0/