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Stable Hexylphosphonate-Capped Blue-Emitting Quantum-Confined CsPbBr3 Nanoplatelets
journal contribution
posted on 2020-05-22, 20:08 authored by Javad Shamsi, Dominik Kubicki, Miguel Anaya, Yun Liu, Kangyu Ji, Kyle Frohna, Clare P. Grey, Richard H. Friend, Samuel D. StranksQuantum-confined CsPbBr3 nanoplatelets (NPLs) are extremely
promising for use in low-cost blue light-emitting diodes, but their
tendency to coalesce in both solution and film form, particularly
under operating device conditions with injected charge-carriers, is
hindering their adoption. We show that employing a short hexyl-phosphonate
ligand (C6H15O3P) in a heat-up colloidal
approach for pure, blue-emitting quantum-confined CsPbBr3 NPLs significantly suppresses these coalescence phenomena compared
to particles capped with the typical oleyammonium ligands. The phosphonate-passivated
NPL thin films exhibit photoluminescence quantum yields of ∼40%
at 450 nm with exceptional ambient and thermal stability. The color
purity is preserved even under continuous photoexcitation of carriers
equivalent to LED current densities of ∼3.5 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 ligand.
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13 Cfilms exhibit photoluminescence quantum yieldsammonium ligandstabilityblue-emitting quantum-confined CsPbBr 3 NPLsfilm formtheory calculationsphosphonate ligandlight-emitting diodescoalescence phenomenaoleyammonium ligandsC 6 H 15 O 3 Pcarriers equivalentdevice conditionsMAS NMRhexyl-phosphonate ligandLED450 nmphosphonate-passivated NPLbinding affinity31 PStable Hexylphosphonate-Capped Blue-Emitting Quantum-Confined CsPbBr 3 Nanoplatelets Quantum-confined CsPbBr 3 nanoplateletscolor purity133 Cs
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